Ieee STD 404 IEEE Standard For Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V To 500 000 V PDF

 

IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

IEEE Power Engineering Society Sponsored by the Insulated Conductors Committee

IEEE 3 Park Avenue New York, York, NY 10016-599 10016-5997, 7, USA 15 March 2007

IEEE Std 404™-2006 (Revision of IEEE Std 404-2000)

 

IEEE Std 404™-2006 (Revision of IEEE Std 404-2000)

IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V Sponsor

Insulated Conductors Committee of the IEEE Power Engineering Society  Approved 6 December 2006 2006  

IEEE-SA Standards Board  Board 

 

Abstract:  Electrical ratings and test requirements of cable joints used with extruded and Abstract:  laminated dielectric shielded cable rated in preferred voltage steps from 2500 V to 500   000 V are established in this standard. In addition, test requirements for cable jacket and cable shield restoration devices are defined. A variety of common joint constructions are also defined. This standard has been designed to provide uniform testing procedures that can be used by manufacturers and users to evaluate the ability of underground power cable joints, and associated cable shield and cable cab le jacket restoration components, to perform reliably in service. Keywords:   cable joints, dielectric integrity tests, extruded dielectric cable, impulse withstand Keywords: voltage voltage (BIL), laminated dielectric cable, sheath/shield sectionalizers, transition joints, withstand

 _________________________  _______________________ __ The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright © 2007 by the Institute of Electrical and Electronics Engineers, Inc.  All rights reserved. reserved. Published 15 March 2007. Printed Printed in the United States of America. America. IEEE is a registered trademark in the U.S. Patent & Trademark Office, owned by the Institute of Electrical and Electronics Engineers, Incorporated. Print: PDF:

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Introduction This introduction is not part of IEEE Std 404-2006, IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500  000 V.

This revision of IEEE Std 404™-2000 now includes fingerprint tests to establish and subsequently confirm the properties of materials or components used in certain cable joints, such as heat-shrinkable, hand-taped, and certain multi-component cold-shrink joints that cannot be subjected to the 100% electrical production tests of premolded and single-component cold-shrink joint designs. This revision of the standard has now harmonized the requirements between the cable accessory standards for joints and terminations, making it easier to perform qualification tests on a complete cable system. In addition, test requirements for cable jacket and cable shield restoration devices have been added, which were not present in previous editions of the standard. Joints that connect more than two cables or connect cables with two different conductor sizes are not covered by this standard. However, manufacturers and users are encouraged to use appropriate parts of this standard to evaluate these types of joints.

Notice to users Errata Errata, if any, for this and all other standards can be accessed at the following URL: http:// standards.ieee.org/reading/ieee/updates/errata/index.html. Users are encouraged to check this URL for errata periodically.

Interpretations Current interpretations can be accessed at the following URL: http://standards.ieee.org/ http://standards.ieee.org/reading/ieee/inte reading/ieee/interp/ rp/ index.html.

Patents  Attention is called to the possibility that implementation of this standard may require use of subject matter covered by patent rights. By publication of this standard, no position is taken with respect to the existence or validity of any patent rights in connection therewith. The IEEE shall not be responsible for identifying  patents or patent applications for which a license may be required to implement an IEEE standard or for conducting inquiries into the legal validity or scope of those patents that are brought to its attention.

iv  Copyright © 2007 IEEE. All rights reserved.

 

Participants At the time this standard was completed, the Revision of IEEE Cable Joint Standard 404 Working Group had the following membership: Glenn J. Luzzi, Chair   Frank DiGugliemo, Vice Chair   Andre Bellemare Bob Benn Jim Braun Thomas C. Champion, III Jack Cherry Philip Cox David Crotty John P. DuPont Robert D. Fulcomer Robert Gear, Jr.

Paul Hann Rick Hartlein Wolfgang Haverkamp Mike Jackson Ed Jankowich Roy Jazowski Sherif Kamel Carlos Katz Gael Kennedy Albert Kong Frank Kuchta

Allen MacPhail John M. Makal Mike Malia Michael Smalley Gregory Stano Frank Stepniak Bill Taylor Milan Uzelac Carl Wentzel Harry Yaworski

The following members of the individual balloting committee voted on this standard. Balloters may have voted for approval, disapproval, or abstention. Roy W. Alexander Earle C. Bascom, III Michael G. Bayer Harvey L. Bowles Chris Brooks Kent W. Brown Vern L. Buchholz Weijen Chen Robert A. Christman Mark S. Clark John H. Cooper Tommy P. Cooper Russ C. Dantzler Gary L. Donner Donald G. Dunn

R. B. Gear, Jr. Randall C. Groves Frank DiGuglielmo Richard L. Harp Dennis Horwitz David W. Jackson Edward M. Jankowich A. S. Jones Gael Kennedy Jim Kulchisky William E. Larzelere, Jr. William E. Lockley G. L. Luri Glenn J. Luzzi William M. McDermid

Michael S. Newman Joe W. Nims Ralph E. Patterson Iulian E. Profir Bartien Sayogo Michael J. Smalley  Nagu N. Srinivas Gregory J. Stano S. Thamilarasan James R. Tomaseski Martin J. Von Herrmann John N. Ware, Jr. Joe D. Watson Lee E. Welch William D. Wilkens

Gary R.D. Engmann Robert Fulcomer

Gary L.I.Michel Rachel Mosier Shantanu Nandi

James Wilson, Jr. Tiebin W. Zhao

v  Copyright © 2007 IEEE. All rights reserved.

 

When the IEEE-SA Standards Board approved this standard on 6 December 2006, it had the following membership: Steve M. Mills, Chair   Richard H. Hulett, Vice Chair Don Wright, Past Chair   Judith Gorman, Secretary Mark D. Bowman Dennis B. Brophy William R. Goldbach Arnold M. Greenspan Robert M. Grow Joanna N. Guenin Julian Forster* Mark S. Halpin

Kenneth S. Hanus William B. Hopf Joseph L. Koepfinger* David J. Law Daleep C. Mohla T. W. Olsen Glenn Parsons Ronald C. Petersen Tom A. Prevost

Greg Ratta Robby Robson Anne-Marie Sahazizian Virginia Sulzberger Malcolm V. Thaden Richard L. Townsend Walter Weigel Howard L. Wolfman

*Member Emeritus

Also included are the following nonvoting IEEE-SA Standards Board liaisons: Satish K. Aggarwal, NRC Aggarwal, NRC Representative Representative   Richard DeBlasio, DOE DeBlasio, DOE Representative Representative  Alan H. Cookson, NIST Cookson, NIST Representative  Representative  Don Messina  IEEE Standards Program Manager, Document Document Development William Ash  IEEE Standards Program Manager, Technical Technical Program Development  

vi  Copyright ©2007 IEEE. All rights reserved.

 

 

Contents 1. Scope ............................ .......................................... ............................ ............................ ............................ ............................ ............................ ........................... ........................... ............................ ................ 1  2. Normative references....... references..................... ............................ ........................... ........................... ............................ ............................ ........................... ........................... ........................... ............. 1  3. Definitions......................... Definitions....................................... ............................ ............................ ............................ ............................ ............................ ........................... ........................... ........................ .......... 3  3.1 Cable joint categories ............ .......................... ............................ ............................ ........................... ........................... ............................ ............................ ........................... ............. 3  3.2 Joint constructions .............. ........................... ........................... ............................ ........................... ........................... ............................ ............................ ............................ ................. ... 3  3.3 Other terms .............. ............................ ............................ ............................ ............................ ............................ ............................ ............................ ........................... .......................... ............. 4  4. Service conditions .............. ............................ ........................... ........................... ............................ ............................ ........................... ........................... ............................ ........................ .......... 4  5. Ratings................ Ratings.............................. ............................ ........................... ........................... ............................ ............................ ........................... .......................... ........................... ........................... ............. 4  5.1 Voltage ........................... ......................................... ............................ ............................ ............................ ............................ ............................ ........................... ........................... .................... ...... 4  5.2 Current and temperature .............. ............................ ............................ ........................... ........................... ............................ ............................ ........................... ..................... ........ 4  6. Construction ........................... ......................................... ............................ ............................ ........................... ........................... ............................ ........................... ........................... .................... ...... 7  6.1 Identification.......... Identification........................ ........................... ........................... ............................ ............................ ........................... ........................... ........................... ........................... ................. ... 7  6.2 Shielding................. Shielding............................... ............................ ............................ ........................... ........................... ............................ ............................ ........................... ........................... ................ 8  6.3 Sheath/shield sectionalizers......................... sectionalizers....................................... ............................ ........................... ........................... ............................ ........................... ................... ...... 8  7. Testing Testing............. ........................... ........................... ........................... ............................ ........................... ........................... ............................ ............................ ............................ ............................ ................ 8  7.1 Production tests for premolded and single-component cold-shrink joints............. joints .......................... .......................... ................. .... 8  7.2 Fingerprint tests for heat-shrink heat-shrink and multi-component cold-shrink joint components...................... components........................ .. 9  7.3 Fingerprint tests for elastomeric taped joint components ............ .......................... ........................... .......................... ........................... .............. 10  7.4 Design tests and testing sequence for all joint types................................. types............................................... ............................ ........................... ............. 11  7.5 Design test conditions................... conditions................................ ........................... ............................ ............................ ........................... ........................... ........................... ................... ...... 12  7.6 Dielectric integrity tests tests............. .......................... ........................... ............................ ............................ ........................... ........................... ............................ ...................... ........ 12  7.7 Voltage withstand tests ........................... ........................................ ........................... ........................... ........................... ........................... ........................... ........................ .......... 15  7.8 Short-time current test ........................... ........................................ ........................... ........................... ........................... ........................... ............................ ......................... .......... 17  7.9 Cyclic aging test for extruded dielectric and transition joints.......... joints....................... ........................... ........................... ....................... .......... 17  7.10 High-voltage time test.......................... test........................................ ........................... ........................... ........................... ........................... ............................ ........................ .......... 20  7.11 Sectionalizer tests .............. ............................ ........................... ........................... ............................ ............................ ........................... ............................ ............................ ............. 20  7.12 Semiconducting shielding test .............. ............................ ........................... ........................... ............................ ........................... ............................ ....................... ........ 21  7.13 Cable metallic-shield restoration and cable jacket restoration components....................... components.................................... ............... 21  7.14 Connector thermal and mechanical tests................................... tests................................................. ........................... ........................... ........................... ............... 24  Annex A (informative) Typical values of heat-shrinkable and multi-component cold-shrink joint component tests and sampling rates ......................... ....................................... ........................... ........................... ........................... ........................... ........................... ................ ... 25  Annex B (informative) (informative) Typical values of elas elastomeric tomeric taped joint component component tests and sampling rates ...... 26  Annex C (informative) Bibliography..... Bibliography................... ........................... ........................... ........................... ........................... ........................... ........................... ...................... ........ 27 

vii  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

1. Scope This standard establishes electrical ratings and test requirements of cable joints used with extruded and laminated dielectric shielded cables rated in preferred voltage steps from 2500 V to 500  000 V. In addition, it defines test requirements for cable jacket and cable shield restoration devices. This standard also defines a variety of common joint constructions. Joints that connect more than two cables or connect cables with two different conductor sizes are not covered by this standard. However, manufacturers and users are encouraged to use appropriate parts of this standard to evaluate these joints.

2. Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies. AEIC CS1, Specifications for Impregnated Paper-Insulated Metallic-Sheathed Cable, Solid Type.1  AEIC CS2, Specification for Impregnated Paper and Laminated Paper Polypropylene Insulated Cable, High Pressure Pipe Type. AEIC CS3, Specifications for Impregnated-Paper-Insulated Metallic Sheathed Cable, Low Pressure GasFilled Type. AEIC CS4, Specifications for Impregnated-Paper-Insulated Low and Medium Pressure Self-Contained Liquid Filled Cable.

1

  AEIC publications are available from the Association of Edison Illuminating Companies, 600 N. 18th Street, P.O. Box 2641, Birmingham, AL 35291-0992, USA (http://www.aeic.org/). AEIC publications are also available from Global Engineering Documents, 15 Inverness Way East, Englewood, CO 80112-5704, USA (http://global.ihs.com/).

1  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

AEIC CS6, Specifications for Ethylene Propylene Rubber Insulated Shielded Power Cables Rated 5 Through 69 kV. AEIC CS7, Specifications for Crosslinked Polyethylene Insulated Shielded Power Cables Rated 69 Through 138 kV. AEIC CS8, Specification for Extruded Dielectric Shielded Power Cables Rated 5 Through 46 kV. ANSI C119.4, Electric Connectors— C Connectors onnectors for Use Between Aluminum-toAluminum-to-Aluminum Aluminum or Aluminumto-Copper Bare Overhead Connectors.2  ASTM D149-97a, Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies. Frequencies.3  ASTM D412-98, Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers. ASTM D991-89, Standard Test Method for Rubber Property-Volume Resistivity of Electrically Conductive and Antistatic Products. ASTM D4325-02, Standard Test Methods for Nonmetallic Semi-Conducting and Electrically Insulating Rubber Tapes. ASTM D4496-04, Standard Test Method for DC Resistance or Conductance of Moderately Conductive Materials. ICEA P-32-382, Short-Circuit Characteristics Characteristics of Insulated Cable.4  ICEA P-45-482, Short-Circuit Short-Circuit Performance of Metallic Shields and Sheaths on Insulated Cable. IEEE Std 4™, IEEE Standard Techniques for High-Voltage Testing.5, 6 IEEE Std 82™, IEEE Standard Test Procedure for Impulse Voltage Tests on Insulated Conductors. IEEE Std 575™-1988, IEEE Guide for the Application of Sheath-Bonding Met Methods hods for Single-Conductor Cables and the Calculation of Induced Voltages and Currents in Cable Sheaths. Sheaths.7  IEEE Std 592™, IEEE Standard for Exposed Semiconducting Shields on High-Voltage Cable Joints and Separable Insulated Connectors. IEEE Std C37.09™, IEEE Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis.  NEMA WC4/ICEA S-65-375, S-65-375,   Varnished-Cloth-Insulated Wire and Cable for the Transmission and Distribution of Electrical Energy. Energy.8  2  ANSI publications are available from the Sales Department, American National Standards Institute, 25 West 43rd Street, 4th Floor,  New York, NY 10036, 10036, USA (http://www.ansi.o (http://www.ansi.org/). rg/). 3  ASTM publications are available from the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, USA (http://www.astm.org/). 4  ICEA publications are available from the Insulated Cable Engineers Association, P.O. Box 20048, Minneapolis, MN 55420, USA (http://www.icea.net/). 5  IEEE publications are available from the Institute of Electrical and Electronics Engineers, 445 Hoes Lane, Piscataway, NJ 088551331, USA (http://standards.ieee.org/). 6  The IEEE standards or products referred to in this clause are trademarks of the Institute of Electrical and Electronics Engineers, Inc. 7   IEEE Std 575-1988 has been withdrawn; however, copies can be obtained from Global Engineering, 15 Inverness Way East,

Englewood, CO 80112-5704, USA, tel. (303) 792-2181 (http://global.ihs.com/). 8   NEMA publications are available from Global Engineering Documents, 15 Inverness Way East, Englewood, CO 80112, USA (http://global.ihs.com/).

2  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

3. Definitions For the purposes of this standar  standar d, d, the following terms and definitions apply. The Authoritative Dictionary 9 of IEEE Standards Terms  Terms [B7] [B7]  should be referenced for terms not defined in this clause.

3.1 Cable joint categories Cable joints described the categories categories are  provided onlyare forgenerally convenience. Theyby areone notofintended to coverthat all follow. possibleThese joint descriptive constructions. Some joint constructions may incorporate characteristics characteristics of two or more of the design categories listed. 3.1.1 extruded: A joint in which both cables are insulated with extruded dielectric materials rated 2.5 kV to 500 kV. 3.1.2 laminated: A joint in which both cables have a dielectric that consists of fluid-impregnated paper or  paper/synthetic laminated laminated tape, or varnished cloth. 3.1.3 transition: A joint that connects an extruded dielectric cable to a laminated dielectric cable.

3.2 Joint constructions 3.2.1 field vulcanized: A joint constructed in the field using externally applied heat and pressure to crosslink the joint dielectric. 3.2.2 filled: A joint consisting of an outer shell that is filled with an insulating material to occupy the space around the individual insulated conductor(s). 3.2.3 heat-shrink: A joint consisting of one or more expanded polymeric extruded tubes or molded parts that undergo thermally activated recovery when heated to an appropriate temperature. 3.2.4 multi-component cold-shrink:  A joint provided to the end user as two or more individual components, excluding the metallic splice, and the cable shield and jacket restoration components, that are applied over a prepared cable and reduced in diameter without the use of heat. 3.2.5 premolded: A joint that is factory molded in the shape that it will take when installed. Installation is

 performed by sliding the joint over a prepared cable. The use of heat is not a part of the installation  procedure. 3.2.6 single-component cold-shrink:  A joint provided to the end user as a single component device, excluding the metallic splice, and the cable shield and jacket restoration components, that is applied over a  prepared cable and reduced in diam diameter eter without tthe he use of heat. 3.2.7 taped: A joint constructed in the field with the use of one or more tapes that are applied over the cable layers. Heat may or may not be applied as part of the installation procedure.

9

 The numbers in brackets correspond to those of the bibliography in in Annex  Annex C.

3  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

3.3 Other terms 3.3.1 fingerprinting:  Tests made to establish and subsequently confirm the properties of materials or components used in cable accessories. The samples used for the initial tests shall be from the same batch as those used in the accessory design tests. For the purposes of this standard, this only applies to fieldfabricated joint constructions such as heat shrinkable, multi-component cold-shrink joints, field vulcanized,

and taped joints. 3.3.2 sectionalizer:  A sectionalizer is used to minimize induced current in the cable sheath/shield by electrically interrupting interrupting the semiconducting shield and conducting metallic sheath or shield of the two cable lengths that are joined together. Sectio Sec tionalizers nalizers are primarily used on cable systems operating at 60 kV and 10 above as described in IEEE Std 575.  

4. Service conditions Current cable joint designs are considered suitable for use under the following service conditions. However, it must be understood that this list was compiled based more on user and manufacturer experience than on actual design testing. It is not meant, in any way, to imply that any or all of these conditions are fully verified in this standard. For specific questions regarding these or other service conditions, the manufacturer should be consulted. a)  In-air, including exposure to direct sunlight  b)  Buried in earth c)  Intermittentl Intermittently y or continuously submerged in water at a depth not exceeding 7 m (23 ft) d)  Environmental temperatures temperatures within the range of −30 °C to +50 °C e)  In underground chambers, tunnels, and vaults f)  Approximately horizontal installation installation of laminated dielectric joints rated 69 kV to 500 kV

5. Ratings

5.1 Voltage The voltage ratings and test levels of cable joints shall be in accordance with Table 1 through Table 4. 4.  

5.2 Current and temperature The current and temperature ratings of the cable joint shall be equal to or greater than those of the cable for which it is designed as verified in 7.8, 7.8,  7.9, 7.9,  7.14, and 7.14, and the emergency operating temperature test of 7.7.3. 7.7.3. For  For transition joints, the maximum temperature rating is based on the cable with the lower temperature limit.

10

 For information on references, see Clause see  Clause 2.  2. 

4  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500  000 V

Table 1 —Voltage ratings and test levels for extruded dielectric cable joints rated 2.5 kV to 46 kV AC voltage design tests Voltage rating phase-toground,  b U  (kV rms)  

Voltage rating phase-to-phase,  a U (kV rms)  

Basic insulation level (BIL) and full wave (kV crest)

0

2.5

1.4

60

Column A cyclic aging

Column D 1 min AC withstand voltage (kV)

Minimum partial discharge voltage level, 1.5 U   0  c (kV rms)  

DC withstand voltage 15 min (kV)

Column B 5 min at 4.5 U0 

Column C 5 h at 3.5 U0 

voltage (kV rms)

(kV rms)

(kV rms)

4

6

5

9

2

30

5

2.9

75

9

13

10

18

5

35

8

4.6

95

14

21

16

23

7

45

15

8.7

110

26

39

31

35

13

75

25

14.4

150

43

65

50

52

22

105

35

20.2

200

61

46

26.6

250

67  

91  d

 d

100  

71  d

80  

69

30

140

80

40

172

a

For use with 100% insulation level cable as defined in the applicable AEIC CS6 or AEIC CS8. To obtain test values for voltage classes that are not listed, use linear interpolation between the next higher and lower listed values and round off to the nearest whole kilovolt.  b c

For grounded systems. Based on a sensitivity of 5 pC.

d

Values interpolated between 35 kV and 69 kV class.

5  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

Table 2 —Voltage ratings and test levels for extruded dielectric cable joints rated 69 kV to 500 kV AC voltage tests

a 

DC withstand voltage 15 min (kV)

Minimum partial discharge voltage level, 1.5 U0   c (kV rms)  

100

240

60

200

166

300

100

650

240

200

315

120

93.0

750

280

232

375

140

230 345

132.8 199.2

1050 1300

400 600

332 500

525 650

200 300

500

288.7

1550

870

725

775

435

Voltage rating phase-tophase, U a (kV rms)   

Voltage rating phase-toground, U0  b (kV rms)   

BIL and full wave (kV crest)

69

39.8

350

120

115

66.4

550

138

79.7

161

Column A 15 min withstand test at 3 U0  (kV rms)

Column B 6 h HV time test at 2.5 U0  (kV rms)

For use with 100% insulation level cable as defined in the applicable AEIC CS6 or AEIC CS7. To obtain test values for

voltage classes that are not listed, use linear interpolation between the next higher and lower listed values and round off to the nearest whole kilvolt.  b 

For grounded systems.

c 

Based on a sensitivity of 5 pC.

Table 3 —Voltage ratings and test levels for transition cable joints Voltage rating

Voltage rating phaseto-phase,  U a (kV rms)  

phase-toground, U0  b (kV rms)   

AC withstand test

AC HV time test

BIL and full wave (kV crest)

Time (min)

Time (h)

Voltage (kV rms)

Voltage (kV Rms)

DC withstand voltage 15 min  c (kV)  

2.5

1.4

60

1

8

6

8

30

5.0

2.9

75

1

16

6

16

38

8.7

5.0

95

1

20

6

20

48

15

8.7

110

1

35

6

35

55

25

14.4

150

1

58

6

58

75

35

20.2

200

1

80

6

80

100

46

26.6

250

1

100

6

100

125

69

39.8

350

1

100

24

100

175

115

66.4

450

1

170

24

170

225

120

69.3

550

1

170

24

170

275

138 161

79.7 93.0

650 750

1 1

200 230

24 24

200 230

325 375

230

132.8

1050

1

330

24

330

525

345

199.2

1300

1

500

24

500

650

500

288.7

1550

1

720

24

720

775

a 

For use with 100% insulation level cable as defined in the applicable AEIC CS1, AEIC CS2, AEIC CS3, or AEIC CS4. To obtain test values for voltage classes that are not listed, use linear interpolation between the next higher and lower listed values and round off to the nearest whole kilovolt.

 b 

For grounded systems.

c 

Voltages represent 0.5 times the BIL.

6  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

Table 4 —Voltage ratings and test levels for laminated cable joints c

AC withstand test 

Voltage rating phase-toground, U0  b (kV rms)   

BIL and full wave (kV crest)

Time (h)

2.5

1.4

60

6

8

30

5.0

2.9

75

6

16

38

8.7

5.0

95

6

20

48

15

8.7

110

6

35

55

25

14.4

150

6

58

75

35 46

20.2 26.6

200 250

6 6

80 110

100 125

69

39.8

350

24

100

175

115

66.4

450

24

170

225

120

69.3

550

24

170

275

Voltage rating phaseto-phase, U a (kV rms)   

Voltage (kV Rms)

DC withstand voltage 15 min )d (kV    

138

79.7

650

24

200

325

161

93.0

750

24

230

375

230

132.8

1050

24

330

525

345

199.2

1300

24

500

650

500

288.7

1550

24

720

775

a

For use with 100% insulation level cable as defined in the applicable AEIC CS1, AEIC CS2, AEIC CS3, or AEIC CS4. To obtain test values for voltage classes that are not listed, use linear interpolation between the next higher and lower listed values and round off to the nearest whole kilovolt.

 b

For grounded systems. Where this test voltage or test procedure differs from the applicable AEIC specification, the latter shall apply.

c

d

Voltages represent 0.5 times the BIL.

6. Construction

6.1 Identification Cable joints shall be permanently and legibly identified with the following information: a)  Company name or logo  b)  Part identification c)  Date of manufacture (month and year) Joints that cannot accommodate this information shall be supplied with a label that contains this information. The manufacturer shall also provide a method of securely attaching the label to the outside of the joint after it is assembled in the field unless otherwise specified by the user. In all cases, the identification shall be legible for the life of the joint.

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IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

In addition, the following information shall be contained on either the joint, joint components, or the  packaging material: material: d)  “Use before” date and storage conditions, if applicable e)  Maximum phase-to-phase or phase-to-ground voltage rating f)  Cable insulation diameter range If the joint consists of a kit that contains a variety of materials manufactured at different times, then the date of manufacture shall be the date that the kit is packaged.

6.2 Shielding Cable joints shall have a shielding system that is capable of maintaining the outer surface of the joint effectively at ground potential. The shielding shall comply with the requirements of IEEE Std 592.

6.3 Sheath/shield sectionalizers

The sheath/shield sectionalizer must meet the requirements of 7.11 7.11   to ensure they are capable of withstanding ac and lightning conditions. Sectionalizers must also be impervious to moisture entry to be functional. The requirements of 7.13.2 may  be used to verify the moisture iintegrity ntegrity of a sec sectionalizer tionalizer desi design. gn. Sectionalizers shall also be mechanically rugged.

7. Testing To claim conformance to this standard, a cable joint manufacturer shall qualify the particular joint design, including material and construction details, according to the design tests of 7.4, 7.4,   and also perform the  production tests according to the requirements of  7.1,   7.1, 7.2, or 7.2, or 7.3 for that particular design category. Production tests shall be performed on 100% of all premolded joints produced and also 100% of all singlecomponent cold-shrink joints produced. The production electrical tests of 7.1 cannot be performed on field fabricated joints, such as heatshrinkable, hand-taped, or certain multi-component cold-shrinkable joints. To assure the reliability of these field-fabricated joints, the manufacturer shall perform a series of physical and electrical tests on the materials that make up the joint according to 7.2  7.2  for heat-shrink or multi-component cold-shrink joint components and 7.3 for taped joint components.

7.1 Production tests for premolded and single-component cold-shrink joints The following production tests shall be performed by the manufacturer on 100% of all premolded and single-component cold-shrink joints produced: a)  Partial discharge voltage level (see 7.6.1 7.6.1))  b)  AC withstand or full-wave impulse withstand voltage (see 7.7.1 and 7.7.3)  7.7.3) 

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IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

7.2 Fingerprint tests for heat-shrink and multi-component cold-shrink joint components The following fingerprint tests shall be performed by the manufacturer according to the sampling rate shown in Table A.2. A.2. These  These tests shall be performed on stress control, conductive, insulating and protective tubes whether extruded or molded. The tests are performed after these components have completed all manufacturing processes, such as molding, extruding, cross-linking and expansion, i.e., in the as-supplied forms. The required tests are summarized in Table A.1 along with typical values.

7.2.1 Visual examination Expanded tubes shall be free from splits, pinholes, inclusions, or other visible defects. Tubing edges shall  be straight and smooth.

7.2.2 Dimensions The wall thickness of expanded tubes shall be measured at four equally-spaced positions around the sample. The length of the expanded tubes shall also be measured.

The same tubes shall then be fully recovered and cooled (if applicable). The above measurements shall then  be repeated. Calculate the ratio of minimum thickness to maximum thickness expanded and the ratio of minimum thickness to maximum thickness recovered. Calculate the change in length after recovery. See Table A.1 for typical values of expanded wall thickness ratio, recovered wall thickness ratio, and length change.

7.2.3 Tensile strength and ultimate elongation Specimens shall be prepared from fully-recovered tubing or molded components. Specimen thickness shall  be between 2 mm and 4 mm (0.079 in and 0.157 in). in). From each of the sam samples ples in the lot, five specim specimens ens of each material shall be prepared in accordance with ASTM D412-98. Tubing specimens shall be cut along the length of the tubing. The test shall be performed at a cross-head speed of 500 mm/min ± 50 mm/min (20 in/min ± 2 in/min). The tensile strength is determined using the maximum applied load and the initial specimen cross-sectional area. Ultimate elongation is the increase in length at the point of break over the initial length expressed as a  percentage. See Table A.1 for typical values of tensile strength and elongation.

7.2.4 Volume resistivity of conductive tubes From each of the samples in the lot, five specimens shall be prepared from tubing or molded components and tested in accordance with ASTM D991-89. See Table A.1 for typical values.

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IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

7.2.5 Dielectric strength of insulating tubes The dielectric strength of tubing or molded components shall be determined at room temperature in accordance with ASTM D149-97a. From each sample of the lot, five specimens of tubing or molded components shall be recovered onto a cylindrical mandrel of diameter equal to the fully recovered specimen inside diameter plus 10%. See Table A.1 for typical values of dielectric strength.

7.2.6 Sampling rate Unless otherwise required by customer or manufacturer specifications, the component sampling requirements after each manufacturing step, including molding, extrusion, cross-linking, and expansion, shall be according to the sampling rate shown in Table A.2.  A.2. 

7.3 Fingerprint tests for elastomeric taped joint components

The following fingerprint tests for taped joint components shall be performed by the manufacturer according to the sampling rate shown in Table B.2. B.2. These tests shall be performed on non metallic and electrically insulating rubber tapes according to 7.3.1, 7.3.2, 7.3.3, and 7.3.5 and on semiconducting rubber tapes according to 7.3.1, 7.3.2, 7.3.3 and 7.3.4. The required tests for each type of tape, along with the corresponding ASTM tape classification, are summarized in Table B.1 along with typical values. All tests are performed on the sample rolls after removing and discarding at least 610 mm (24 in) of the outer layer. All sample rolls shall be subjected to 23 ºC ± 2 ºC and 50% ± 2% relative humidity for a minimum of 16 h  before specimens are removed. All samples are then removed from the rolls at a slow, uniform rate without jerking. The individual samples shall be left for a minimum period of 1 h at 23 ºC ± 2 ºC and 50% ± 2% relative humidity. All tests are then conducted at these same standard conditions.

7.3.1 Fusion Remove three specimens, 280 mm in length, from each roll of the sample lot. Using the winding fixture and  procedure described in Clause 8 and Clause 9 of ASTM D4325-02, wind the specimens using 300% elongation. After wrapping, condition the specimens at 23 ºC ± 2 ºC and 50% ± 2% relative humidity for 24 h. Following the conditioning, the maximum flag for any specimen shall meet the requirements of Table B.1.  B.1. 

7.3.2 Dimensions

7.3.2.1 Length Unwind the tape and separator from each roll of the sample lot. After the conditioning in 7.3, place 7.3, place each tape/separator sample on a hard smooth surface and measure their length. The length shall meet the requirements of Table B.1. B.1.  

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IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

7.3.2.2 Width Unwind the tape and separator from each roll of the sample lot. After the conditioning in 7.3, place 7.3, place each tape/separator sample on a hard smooth surface and measure their width. The width shall meet the requirements of Table B.1. B.1.  

7.3.2.3 Thickness Unwind the tape and separator from each roll of the sample lot. Measure the tape/separator sample thickness at five locations uniformly distributed over the length of the test specimen using the procedure of Clause 12, Clause 13, and Clause 14 of ASTM D4325. The average of the five measurements shall meet the requirements of Table B.1.  B.1. 

7.3.3 Tensile strength and ultimate elongation For each roll in the sample lot, cut five specimens, 610 mm in length, from a single ply of tape (rubber and separator) that is free from visible defects using the ASTM standard die, as shown in Figure 1 (die A) of ASTM D412-98, except that the ends of the specimens cut from 19 mm tape need not be full width. Place

 bench marks on the specimens as directed in ASTM D412-98. Measure the thickness in accordance with 14.2 of ASTM D4325-02, removing the separator where it is not an integral part of the tape. The average  breaking strength and average percent elongation shall meet the requirements of Table B.1 B.1.. When specimens break at the jaws, discard the results and retest.

7.3.4 Volume resistivity This test is applicable only to semiconducting tapes. For each roll in the sample lot, test five specimens. Condition the tapes at 90 ºC ± 2 ºC for 168 h. Remove the specimens from the oven, assemble in electrodes, and test within 2 min. Use strip electrodes for tape as shown in Figure 2 of ASTM D4496-04. Apply direct voltage of 5 V ± 0.5 V for the time specified in ASTM D4496-04. The average volume resistivity shall meet the requirements of Table B.1.  B.1. 

7.3.5 Dielectric strength This test is applicable only to insulating tapes. Make five breakdown tests on each roll of the sample lot. Use type-3 electrodes as described in Table 1 of ASTM D149-97a. To prevent flashover of the sample, insulating fluid may be used, or the tape width can be increased by attaching additional tape strips to each edge of the test sample. Measure and calculate the dielectric strength in kilvolts per millimeter (kV/mm) in accordance with ASTM D149-97a using the short-time test by increasing the voltage at a uniform rate of 500 V/s. The average dielectric strength in kilovolts per millimeter shall meet the requirements of Table B.1.  B.1. 

7.3.6 Sampling Unless otherwise required by rate customer  be according to the the sampling shownorinmanufacturer Table B.2.  B.2.  specifications, the tape sampling requirements shall

7.4 Design tests and testing sequence for all joint types Table 5,  5, Table 6, 6, and  and Table 7 list the sequences of design tests required by this standard. Each column in each of the tables represents one test sequence. These design tests shall be performed on extruded, transition, and laminated dielectric cable joints, respectively. All design tests shall be performed on production units (or  production  produc tion materia materials ls if the the joints joints are fabricate fabricated d in the fi field) eld) to demonst demonstrate rate com complianc pliancee of the de design sign with with this standard. The results of these tests shall be recorded in the form of a report certifying that a joint design meets the requirements of this standard. The report shall be available from the manufacturer upon request. 11  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

7.5 Design test conditions The following design test conditions shall apply unless otherwise specified: a)  Cable joints shall be properly assembled with actual production components according to the manufacturer’s instructions. All parts that are normally grounded shall be connected to the ground of the test circuit.  b)  Ambient air temperature shall be between 10 °C and 40 °C. c)  All ac voltages shall have a frequency of 60 Hz ± 5% or 50 Hz ± 5%, and a sine wave shape of acceptable commercial standards as defined in IEEE Std 4. d)  Voltages shall be measured in accordance with IEEE Std 4. e)  The cable used in these tests should conform to the applicable AEIC specification. Insulation thickness shall be in accordance with AEIC specification for the 100% insulation level. Unless otherwise stated, the smallest nominal diameter cable for which the cable joint is designed should be used, if practical. The exception to this is the short-time current test (see 7.8) 7.8),, in which case the largest nominal conductor for which the cable joint is designed should be used, if  practical. If testing is performed performed on cable not conforming to AEIC specifica specification, tion, it is incumbent

on the manufacturer to ensure that the tests are at least as severe on the joint as would be the case on the appropriate AEIC cable. In this case, the cable construction and corresponding cable specification shall be referenced in the joint test report. f)  If a cable failure occurs during a design test, the failed cable may be reterminated provided that the minimum specified distance between the joint and the termination is met. The test shall be resumed by repeating the step during which the cable failed. If the minimum length cannot be met, the joint on the failed cable or a new joint shall be assembled on a new cable, and the design test shall be repeated. g)  If a joint failure occurs during a design test, all qualification tests in that column sequence of Table 5,  5,  Table 6, 6,   or Table 7  7  shall be repeated for the number of samples specified for that column. Any joint samples that passed the original tests may be used to repeat that column of testing if desired.

7.6 Dielectric integrity tests

7.6.1 Partial discharge voltage level test This procedure is used as a production test for premolded and single-component cold-shrink joints. It is also part of the design test sequence for all joints intended for use on extruded dielectric cables. The  purpose of this test is to verify that the partial discharge voltage level of the test specimen is not less than the value given in Table 1 or Table 2. 2. The  The test voltage shall be raised to 20% above the partial discharge voltage level specified in Table 1 or Table 2. If 2. If partial discharge exceeds 5 pC, the test voltage shall be lowered to the partial discharge voltage level specified in Table 1 or Table 2 and shall be maintained at this level for at least 3 s but not more than 1 min. If partial discharge readings still exceed 5 pC, the joint design does not meet the requirements of this standard.

7.6.2 Ionization test This test is applicable only for transition joints. The purpose of this test is to verify that the ionization factor of transition joints remains within the limits specified in Table 8. 8. The  The ionization factor is the difference, at 50 Hz or 60 Hz, between the dissipation factor measured at an average stress in the cable of 4000 V/mm and the dissipation factor measured at an average stress of 800 V/mm. The measurement voltage is based on the insulation thickness of the laminated cable.

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IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

Table 5 —Design tests and sequence for extruded dielectric cable joints Minimum number of samples required in each sequence Design test

Reference a

b

3(2)   

3(2)   

Partial discharge voltage level

7.6.1 7.6.1  

X

X

AC withstand voltage

7.7.1

X

X

DC withstand voltage

7.7.2

X

X

Impulse withstand voltage at 25 °C

7.7.3

X

X

Impulse withstand voltage at emergency temperature

7.7.3   7.7.3

X

X

Partial discharge voltage level

7.6.1 7.6.1  

X

X

c

3(1)   

3

e

7   

Cyclic aging in-air, 30 cycles (shield and jacket restoration devices, d if applicable)   

7.9.1 or 7.9.2

X

7.9.1 or 7.9.2

Cyclic aging in water, 30 cycles

X

Partial discharge voltage level

7.6.1 7.6.1  

X

X

High-voltage time

7.10 7.10  

X

X

Impulse withstand voltage at 25 °C

7.7.3

X

X

Partial discharge voltage level

7.6.1 7.6.1  

X

X

Sectionalizer test (if applicable) Shield restoration: two short-time d current tests (if applicable)   

7.11

X

X

7.13.1

X

Jacket restoration: cyclic aging in d water, 10 cycles (if applicable)   

7.13.2

X

Short-time current

7.8 7.8  

X

AC withstand voltage

7.7.1

X

Shielding

7.12 7.12  

Connector thermal and mechanical

7.14  7.14 

X X

a

For cyclic aging in-air, three samples are required for 2.5 kV to 46 kV joints according to   7.9.1 and two samples are required for 69 kV to 500 kV joints according to  to  7.9.2. 7.9.2. Shield  Shield and jacket restoration components should be assembled on these in-air samples if applicable.  b

For cyclic aging in water, three samples are required for 2.5 kV to 46 kV joints according to 7.9.1 and two samples are required for 69 kV to 500 kV joints according to 7.9.2.  7.9.2.  For 69 kV to 500 kV, the two samples in water are not required if the joint design

incorporates a solid metal housing that is welded or soldered to a solid cable sheath or pipe. c Three samples are required for 2.5 kV to 46 kV joints. One sample is required for 69 kV to 500 kV joints. d

Shield and jacket restoration component testing shall be performed in the sequence shown if tested in conjunction with design tests of a completed joint. If testing either or both of these components independent of a joint design test, it is not necessary to perform the  previous dielectric tests in this sequence. e

Four samples are required for thermal tests, and three samples are required for mechanical tests.

13  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

Table 6 —Design tests and sequence for transition joints

Design test

Reference

Minimum number of samples required in each sequence  a

 b

2  

2  

AC withstand voltage

7.7.1

X

X

DC withstand voltage

7.7.2

X

X

Impulse withstand voltage at 25 °C

7.7.3

X

X

Impulse withstand voltage at emergency temperature

7.7.3   7.7.3

X

X

Ionization

7.6.2 7.6.2  

X

X

Cyclic aging in-air (shield and jacket restoration devices, c if applicable)   

7.9.2

X

Cyclic aging in water

7.9.2

Ionization

7.6.2 7.6.2  

X X

X

2

 d

7  

High-voltage time

7.10

X

X

Sectionalizer (if applicable)

7.11

X

X

Shield restoration: two short-time c current tests (if applicable)   

7.13.1

X

Jacket restoration: cyclic aging in c water, 10 cycles (if applicable)   

7.13.2

X

Shielding

7.12 7.12  

Connector thermal and mechanical

7.14

X X

a

For cyclic aging in-air, two samples are required. Shield and jacket restoration components should be assembled on these in-air samples if applicable.  b

For cyclic aging in water, two samples are required. For 69 kV to 500 kV, the two samples in water are not required if the joint design incorporates a solid metal housing that is welded or soldered to a solid cable sheath or pipe. c

Shield and jacket restoration component testing shall be performed in the sequence shown if tested in conjunction with design tests of a completed joint. If testing either or both of these components independent of a joint design test, it is not necessary to perform the previous dielectric tests in this sequence. d

Four samples are required for thermal tests, and three samples are required for mechanical tests.

Table 7 —Design tests and sequence for laminated dielectric cable joints

Design test

Reference

Minimum number of samples required a

b

3(1)  

AC withstand voltage

7.7.1

X

DC withstand voltage

7.7.2

X

Impulse withstand voltage at emergency temperature

7.7.3

X

Connector thermal and mechanical

7.14

7  

X

a

Three samples are required for 2.5 kV to 35 kV joints and one sample is required for 46 kV to 500 kV joints.  b

Four samples are required for thermal tests, and three samples are required for mechanical tests.

14  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

Table 8 —Maximum allowable ionization factor values for transition joints Joints connecting paper-insulated lead-covered (PILC) cable

Joints connecting self-contained and high-pressure pipe-type cables

Rated voltage (kV)

Maximum ionization factor (%)

Rated voltage (kV)

Maximum ionization factor ionization (%)

10–20

0.60

≤ 161

0.10

21–35

0.40

> 161

0.05

36–69

0.20

The measurement shall be made at ambient temperature. For transition joints on self-contained or pipe-type cables, the ionization factor is defined as the difference, at 60 Hz, between the dissipation factor measured at 1.2 U0 and the dissipation factor measured at 0.125 U0. U0, the phase-to-ground voltage, shall be that of the cable with the lower rating.

If the measured value is outside the limits specified in Table 8, 8,   the joint design does not meet the requirements of this standard. This test is not required for joints that employ nonlinear, high dielectric constant or impedance layer materials. However, the manufacturer shall demonstrate that the nonlinear material is stable and will  perform effectively effectively over the life life of the joint. joint.

7.7 Voltage withstand tests The purpose of these tests is to verify that the insulation of the test specimen is not defective and will withstand the voltages shown in Table 1 through Table 4. Some 4. Some of the tests are used as both production and design tests. These tests are applicable for all joint types. The test voltage shall be applied to the parts of the cable joint that are energized in service. For transition cable joints, all electrical test values are based on the cable with the lower test requirements. For pressurized cables, the gas or liquid pressure shall be within the operating limits specified by the appropriate AEIC cable standard.

7.7.1 AC voltage This test is applicable as a design test for all joint types. It is also one of the production test options for  premolded and single-component single-component cold-s cold-shrink hrink joints. The test voltage shall be raised, at a rate of 5 kV/s ± 3 kV/s, to the value specified in one of the following:

    Table 1, Column D, for extruded dielectric cable joints 2.5 kV kV to 46 kV     Table 2, Column A, for extruded dielectric cable joints 69 kV to 500 kV     Table 3 for ac withstand test for transition cable joints     Table 4 for ac withstand test for laminated dielectric cable joints

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IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

The cable joints shall withstand the specified test voltage for the time specified in the tables.

7.7.2 DC voltage This test is applicable as a design test for all joint types. The test voltage shall have a negative polarity (the negative terminal is connected to the conductor of the test specimen) and shall be raised to the value specified in Table in Table 1, 1,   Table 2,  2, Table 3, or 3, or Table 4. 4. The  The cable  joints shall withstand withstand the spec specified ified test volt voltage age for 15 mi min. n.

7.7.3 Impulse voltage (BIL) This test is applicable as a design test for all joint types. It is also one of the production test options for  premolded and single-component single-component cold-s cold-shrink hrink joints. The test voltage wave shape shall be as specified in IEEE Std 4, having the BIL specified in Table 1,  1,  Table 2,  2, Table 3, or 3, or Table 4 of this standard. The test procedure (including sample conditioning) shall be as specified in IEEE Std 82.

The cable joint shall withstand ten positive and ten negative full-wave impulses with a magnitude equal to the BIL value specified in Table in Table 1,  1, Table 2, 2,  Table 3, or 3, or Table 4. 4.   Tests at emergency operating temperature shall correspond to the impulse temperature requirements outlined in the applicable standard (see Table 9). 9). The cable manufacturer should be consulted in the case of special-use cables.

Table 9 —Reference cable standards for temperature requirements Cable type

Standard

1.0 kV to 69 kV paper-insulated metallicsheathed

AEIC CS1

69 kV to 500 kV high-pressure pipe-type

AEIC CS2

8 kV to 46 kV low-pressure gas-filled

AEIC CS3

15 kV to 500 kV self-contained

AEIC CS4

5 kV to 69 kV EPR

AEIC CS6

69 kV to 138 kV XLPE

AEIC CS7

5 kV to 46 kV extruded dielectrics

AEIC CS8

600 V to 28 kV varnished cloth

NEMA WC4

For extruded dielectric cable joints, the test shall be performed first with the conductor at ambient temperature, and then again with the conductor at the maximum emergency operating temperature of the cable +0 °C/−5 °C. For transition joints, the test shall be performed first with the conductor temperature of both cables at ambient temperature, and then again with the cables at elevated temperature, +0/ −5 °C. The elevated temperature is based on the maximum emergency operating conductor temperature of the cable with the lower temperature rating. For laminated dielectric cable joints, the test shall be performed only at the maximum emergency operating conductor temperature of the cable, +0 °C/ −5 °C.

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IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

Elevated conductor temperatures are primarily obtained by circulating ac current in the conductor of the cable. There shall be no current in the metallic shields of the cable or joint. The reference location for all conductor temperature requirements is midway between the end of the joint and the base of the termination. In all cases, the test temperature shall be reported in the test report. Elevated conductor temperatures  produced by means other than by circulating current in the conductor of the cable is permissible only by mutual agreement between the supplier and the end user. Such alternate methods must ensure that the conductor temperature is at the maximum emergency operating temperature of the cable +0 °C/−5 °C. When the impulse voltage withstand test is used as a production test, the cable joint shall withstand one full-wave impulse at each polarity with a magnitude equal to the BIL value specified in  Table 1,  1, Table 2, or   Table Table 3. 3.  

7.8 Short-time current test The of thiscurrents. test is to The verify that the extruded cable joint is capable withstanding shorttime,purpose short-circuit magnitude shall be dielectric equal to the short-circuit ratingof(in rms symmetrical amperes) of the largest size conductor for which the joint is designed for a duration of 0.17 s. The 50 Hz or 60 Hz current magnitude shall be sufficient to raise the cable conductor temperature from ambient to its rated short-circuit temperature. temperature. The current magnitude used for this test shall not exceed 35 kA and may be determined by using ICEA P-32-382 and utilizing the formulas given to correct the curves to the

determined by using ICEA P 32 382 and utilizing the formulas given to correct the curves to the appropriate ambient temperature condition. The current magnitude shall be measured in accordance with IEEE Std C37.09. Following the short-time short-time current test, the cable joint shall be tested in accordance with the ac voltage test of 7.7.1 to further verify its integrity.

7.9 Cyclic aging test for extruded dielectric and transition joints The purpose of this test is to verify that cyclic loading will not adversely affect the ability of the cable joint to operate in-air or submerged in water. If a joint design or construction specifically requires an integral jacket restoration kit or environmental seal for proper operation, and the manufacturer only provides the joint with this device as a complete kit, then 7.9.1 7.9.1 or  or 7.9.2 shall be performed with this cover or seal installed. If desired, cable metallic-shield restoration components and/or cable jacket restoration components may be qualified simultaneously with a cable joint qualification. In this case, either or both of these restoration components shall be assembled only on the in-air samples as described in 7.13.  7.13. 

7.9.1 Extruded cable joints rated 2.5 kV to 46 kV If cable restoration components are to be qualified simultaneously with a specific joint design, the appropriate restoration components should be assembled on the in-air joints. The joint samples in water are cycled without jacket restoration components to ensure that these devices do not influence potentially marginal joint electrical interfaces. The test may be conducted on each joint individually or with two or more joints connected in series. The cable joints shall be assembled on a cable that has an insulation outside diameter that is at or near the minimum diameter for which the cable joint is designed, and shall be subjected to the continuous ac voltage shown in Table 1, column 1, column A, for 30 d. The test shall be performed on a minimum of three cable joints in-air and a minimum of three cable joints in tap water, on the same type and size cable. The same six joints are to be used on all cyclic aging tests. The cable joints in water shall be submerged at a minimum depth of 0.3 m (1 ft), measured from the top surface of the joints. The water shall neither be heated nor cooled during this test, but shall be left to follow the load cycling unconstrained.

17  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

A minimum length of 2 m (6.5 ft) of cable is required between joint ends and the base of each termination. The six joints shall be subjected to 30 load cycles. Each load cycle is defined as a 24 h time span with a current-on period and a current-off period. During the current-on period, sufficient ac current shall be passed through the conductor to achieve a cable conductor temperature within +0 °C/−5 °C of the cable rated emergency operating temperature for a period of at least 6 h. There shall be no current in the cable metallic shield. The cable emergency operating temperature shall be determined by reference to the applicable standard (see Table 9 9). ). The cable manufacturer should be consulted in the case of special-use cables. The reference location for all conductor temperature requirements is midway between the water surface and the base of the end terminations for joints tested in water or midway between the joint end and the base of the end terminations for joints tested in-air. The temperature at this location shall not be influenced by the  joint, water, water, or end terminations. terminations. The following information shall be recorded in the test report: a)  The maximum temperature of the outside of the joint housings in water  b)  The maximum temperature of the outside of the joint housings in-air

c)  The temperature of the outside surface of the cables in-air d)  The cable rated emergency operating temperature used to qualify the joint During the current-off period, the reference cable conductor temperature should drop to within 5 °C of the ambient air temperature. If this condition cannot be met, the test shall be interrupted at the end of the 5th, 10th, 15th, 20th, and 25th cycles. During these interruptions, the voltage, current, and any supplemental heat source shall remain off for a period of 24 h to allow the joints to cool as close to room temperature as  possible. The load cycle (current and voltage) and supplemental heat source (if used) shall be resumed at the end of the interruption period. This procedure may be followed even if the temperature condition during the current-off period can be met. The test specimens shall complete 30 load cycles. The 24 h interruption periods are not considered part of a load cycle. If, for any reason, the voltage or conductor temperature falls below the specified level at any time during any given load cycle, then that load cycle shall be repeated. Load cycles may be contiguous, or there may  be periods with no voltage and no current between load cycles to accommodate schedule variations or equipment failures.

7.9.2 Extruded cable joints rated 69 kV to 500 kV and transition joints rated 2.5 kV to 500 kV If cable restoration components are to be qualified simultaneously with a specific joint design the appropriate restoration components should be assembled on the in-air joints. The joint samples in water are cycled without jacket restoration components to ensure that these devices do not influence potentially marginal joint electrical interfaces. The test may be conducted on each joint individually or with two or more joints connected in series. The conductors of multi-conductor joints shall be connected in series. The cable joints shall be assembled on cables that have an insulation outside diameter that is at or near the minimum diameter for which the cable joint is designed. Sheath/shield sectionalizers shall be incorporated if they are part of the joint design. They shall remain shorted until the tests in 7.11 in 7.11 are performed. Testing shall be performed on four cable joints. The same four joints are to be used for all cyclic aging tests. Multi-conductor joints in a common housing are considered one joint. Two joints are suspended in-air

18  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

and two are submerged in tap water to a depth of 1 m (3.3 ft). The two samples in water are not required if the joint design incorporates a solid metal housing that is welded or soldered to a solid cable sheath or pipe. Conduit may be used for the in-water portion of this test and may be made of any appropriate material. The conduit (or enclosure) shall be longitudinally centered on the joints and shall extend a minimum of 300 mm (12 in) beyond each joint end. A vertical tube having a minimum inside diameter of 50 mm (2 in) shall be attached to the conduit. It shall be of sufficient length to provide the specimen with a head of tap water measuring a minimum of 1 m from the top surface of the joint. The water shall neither be heated nor cooled during this test, but shall be left to follow the load cycling unconstrained. A minimum length of 2 m (6.5 ft) of cable is required between the conduit or water tank and the base of each end termination for joints tested in water or between the joint ends and the base of each termination for joints tested in-air. The four joints shall be subjected to 30 load cycles. Each load cycle is defined as a 24 h time span with a current-on period and a current-off period. During the current-on period, sufficient ac current shall be  passed through the cable conductor to achieve a conductor temperature within +0 °C/−5 °C of its rated emergency operating temperature for a period of at least 6 h. For transition joints, the emergency operating temperature of the cable with the lower rating shall be used. The cable emergency operating temperature

shall be determined by reference to the applicable standard (see Table 9) 9).. The cable manufacturer should be consulted in the case of special-use cables. Two times the rated phase-to-ground ac voltage shall be applied continuously for the 30 cycles. For transition joints, two times the rated phase-to-ground ac voltage of the cable with the lower rating shall be used. There shall be no current in the cable metallic shield. The reference location for all conductor temperature requirements is midway between the end of the conduit and the base of the end terminations for joints teste tested d in water or midway between the joint ends and the base of the end terminations for joints tested in-air. For transition joints, this measurement is made on the cable with the lower temperature rating. The temperature at this location shall not be influenced by the  joint, water-filled water-filled conduit, or end termi terminations. nations. The following information shall be recorded in the test report: a)  The maximum temperature of the outside of the joint housings in water  b)  The maximum temperature of the outside of the joint housing in-air c)  The temperature of the outside surface of the cables in-air d)  The cable rated emergency operating temperature used to qualify the joint During the current-off period, the reference cable conductor temperature should drop to within 5 °C of the ambient air temperature. If this condition cannot be met, the test shall be interrupted at the end of the 5th, 10th, 15th, 20th, and 25th cycles. During these interruptions, the voltage and current shall remain off for a  period at least 24h to allow joints to as close to room temperature as This possible. The load cycle (currentofand voltage) shall be the resumed at cool the end of the interruption period. procedure may be followed even if the temperature requirement during the current-off period can be met. The test specimen shall complete 30 load cycles. The 24 h interruption periods are not considered part of a load cycle. If, for any reason, the voltage or conductor temperature falls below the specified level at any time during any given load cycle, then that load cycle shall be repeated. Load cycles may be contiguous or there may be  periods with no voltage and no current between load cycles to accommodate schedule variations or equipment failures.

19  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

For transition joints, the ionization factor shall be measured as specified in 7.6.2 at the beginning of the test  period and at the end of the load cycle test (the completion of 30 cycles). The ionization factor shall be in accordance with Table with Table 8 8.. For transition joints, the internal pressure of the pressurized and laminated dielectric cable shall be maintained at normal operating pressure throughout this test, except for solid-type laminated dielectric cables, which shall have a maximum pressure during the test of 103 kPa (14.9 psi) gauge.

7.10 High-voltage time test The purpose of this test is to verify the electrical integrity of extruded dielectric and transition joints. Table 5 and Table 6 specify the design test sequence. Test voltage is applied as follows: For extruded dielectric cable joints rated 2.5 kV to 46 kV:     Test voltage specified in Table 1, 1, column  column C, for 5 h followed by:

    Test voltage specified in Table 1, 1, column  column B, for 5 min.

For extruded dielectric cable joints rated 69 kV to 500 kV:

    Test voltage specified in Table 2, 2, column  column B, for 6 h. For transition joints rated 2.5 kV to 500 kV:

    Test voltage and time as specified in the ac HV time test column of Table 3. 3.   All joints subjected to this test shall be completely submerged in ambient temperature tap water. The submersion depth is a minimum of 0.3 m (1 ft) for 2.5 kV to 46 kV extruded dielectric cable joints and a minimum of 1 m (3.3 ft) for 69 kV to 500 kV extruded dielectric cable joints and all transition joints. These submersion depths correspond to the submersion depths required during the load cycle tests for each joint construction. They are measured from the top surface of the joint. The joint shall be submerged for at least 1 h before the test voltage is applied. Samples previously tested in a water-filled conduit may be left in the conduit. Samples previously tested in-air shall be submerged in tap water using any convenient method.

7.11 Sectionalizer tests Cable joints with sectionalizers shall be tested in accordance with the following procedures. All joints subjected to this test shall be completely submerged in ambient temperature tap water. The minimum submersion depth shall be 0.3 m (1 ft) for extruded cable joints rated 2.5 kV to 46 kV and 1 m (3.3 ft) for all other joints. This depth corresponds to the submersion depth required during the load cycle test, 7.9.1 and 7.9.2, for 7.9.2, for each joint construction and is measured from the top surface of the joint. The joints containing sectionalizers shall remain submerged in the water following the high-voltage time test.

7.11.1 AC voltage withstand tests CAUTION

A voltage of 20 kV ac shall be applied across each sectionalizer for a minimum of 1 min. During this test, the water should be grounded for safety.

20  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

The sectionalizer shall then be shorted and 20 kV ac shall be applied between the sectionalizer and the grounded water for a minimum of 1 min. The sectionalizer shall withstand both tests without arcing across or to ground.

7.11.2 Impulse voltage withstand tests CAUTION

The impulse test voltage shall be a 1.2 µs × 50 µs wave that meets the requirements of IEEE Std 4. Ten 60 kV crest, positive impulses followed by ten 60 kV crest, negative impulses shall be applied across the sectionalizer. During this test, the water should be grounded for safety. The sectionalizer shall then be shorted and ten 30 kV crest, positive impulses followed by ten 30 kV crest, negative impulses shall be applied between the sectionalizer leads (cable shields) and the grounded water. The sectionalizers are considered satisfactory if the impulse voltage is withstood without any physical damage to the joint, cable, or sectionalizer.

7.12 Semiconducting shielding test

The purpose of this test is to verify that the cable joint insulation shield will maintain the outer surface effectively at ground potential under normal operating conditions, and initiate fault current arcing if the cable joint insulation system should fail. The insulation shield of all joint types shall meet the resistivity stability requirement of IEEE Std 592. All  joints with exposed semiconducting semiconducting shields for use on extruded extruded dielectric cables rate rated d 15 kV to 35 kV shall meet the short-circuit requirements of IEEE Std 592.

7.13 Cable metallic-shield restoration and cable jacket restoration components Virtually all modern cable designs require jacketing materials over the cable metallic shielding. Therefore, when cables are joined, it is necessary to replace or restore these cable components with appropriate devices that will provide the same current carrying capability and environmental protection as the nonspliced portions of the cable. Metallic-shield restoration components are available in various configurations and in many cases are  provided along with an environmental sealing device. The following test sequence encompasses both the metallic-shield restoration and environmental seal restoration components. They may be tested on joints that are undergoing design testing or they may be tested on separate samples. If they are tested on separate samples, these samples shall be assembled in the same manner as they would be installed in service. If a device is being tested independently as a shield restoration or a jacket restoration device, it is only necessary to perform the tests in the appropriate subclause (7.13.1 (7.13.1   or 7.13.2). 7.13.2). If these tests are being  performed on the restoration components only, and not as part of a joint qualification test, it is not necessary to apply the continuous, ac phase-to-ground voltage of 7.9 or any of the dielectric tests in the sequence. The cable metallic-shield restoration and/or cable jacket restoration components are installed on three complete joint assemblies for 2.5 kV to 46 kV joint ratings or two complete joint assemblies for 69 kV to 500 kV joint ratings. It is not possible to perform a dielectric test of the integrity of the environmental seal in certain situations without altering the design of the device. An example is when either bare metallicshield materials emerge from the jacket restoration devices or when the cable jackets are semiconductive. Therefore, the integrity of the seal device shall be determined using moisture sensitive tape. Prior to installing the jacket restoration component, apply a moisture sensitive tape within 25 mm (1 in) of the inner moisture barrier of the jacket restoration component on each side of the joint. A sufficient length of this tape shall be used to go completely around the circumference of the cable. 21  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

The metallic-shield restoration and cable jacket restoration components are only installed on cable joints that will be cyclically aged in-air according to the requirements of 7.9.1 7.9.1   or 7.9.2,  7.9.2,  cyclic aging test, for 30 load cycles. The joint samples in water are cycled without jacket restoration components to ensure that these devices do not influence potentially marginal joint electrical interfaces.

7.13.1 Cable metallic-shield restoration componen components ts Load cycle the cable joints, shield restoration components, and/or the jacket restoration components, as applicable, in-air only according to 7.9.1 7.9.1 for  for joint ratings of 2.5 kV to 46 kV or  7.9.2 or  7.9.2 for  for joint ratings of 69 kV to 500 kV. Following the load cycling, and, if applicable, the partial discharge, high-voltage time, impulse, and sectionalizer tests, it is necessary to verify that the metallic-shield restoration components are capable of withstanding two, short-time, short-circuit currents. The 50 Hz or 60 Hz current magnitude (in rms symmetrical amperes) and duration (in seconds) shall be determined by Equation (1). The current magnitude shall be sufficient to raise the cable shield temperature from ambient to its rated short-circuit temperature, either 350 °C if all cable materials in direct contact with the metallic shield are thermosetting (e.g., XLPE or EPR) or 200 °C if any cable materials in direct contact with the metallic shield are thermoplastic or laminated dielectric material. For example, as stated in ICEA P-45-482, a cable having a

cross-linked semiconducting shield under the metallic shield and a cross-linked jacket over the metallic shield would have a maximum allowable shield temperature of 350 °C. Or, if the cable sheath is lead, the short-circuit temperature shall be limited to 200 °C regardless of the other cable materials. The 350 °C or 200 °C short-circuit temperatures are calculated values only and need not be measured during the test. The current source shall be connected between the cable conductor and the cable shield at one end of the cable. The conductor and shield shall be connected together at the other end of the sample. The test may be  performed  perfor med on several several joints si simulta multaneousl neously y if connected in ser series. ies. If the shielding shielding com component ponentss exit the jacket restoration components on each end of the joint, then a jumper of appropriate cross section shall be used to  join them across each jjoint. oint. The current current magnit magnitude ude sshall hall be measured measured in accordan accordance ce with with IE IEEE EE S Std td C3 C37.09. 7.09. In accordance with ICEA P-45-482, the required short-circuit test current magnitude for the shield may be calculated by the following equation:

(I/A)2*t = K* log10 [(T2 + λ ) / (T1 + λ )] )]

where I

(1)

is the short-circuit current in amperes

A

is the cable shield cross-sectional area in circular mils (calculated from Table 11)  11) 

t

is the duration of short circuit in seconds (shall be ≤ 1 s)

T1 

is the starting ambient temperature in degrees Celsius

T2 

is equal equal to to 350 °C if al alll cable cable materials materials in dir direct ect contact contact with the metallic metallic shield ar aree ther thermosetting mosetting (e.g., XLPE or EPR) or 200 °C if any cable materials in direct contact with the metallic shield are thermoplastic or laminated. This temperature is a calculated value only. It is not necessary to measure the shield temperature during the test.

λ , K

are determined from Table 10

22  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

Table 10 —Values for λ or K Cable shielding material

Value of λ  

 a

228

0.0125

Bronze  

564

0.0297

Copper  c 

Aluminum    b

234

0.0297

 d

236

0.0010

 e

180

0.0036

219

0.0080

1800

0.0140

Lead   Steel    f 

Zinc    g

Cupro-nickel alloy   a

¾ hard, 1350 aluminum.

 b Commercial bronze, c

90% copper, 10% zinc.

Annealed, 100% conductivity copper.

d e f

Value of K

Pure lead, 99.99%. Mild or low carbon steel. Commercial rolled zinc, 0.08% lead.

g

80% copper, 20% nickel.

Table 11 —Calculation —Calculation of cross-sectional area [the symbol A in in Equation  Equation (1)]  (1)]  Formula for calculating A (See Note 2)

Type of shield or sheath

Wires applied either helically, as a braid or serving; or 2

nds   1.27 nwb

(a) (b)

4bdm × (100 / [2 (100 − L)])−1/2 

(c)

1.27 [π (dis + 50) + B] b

(d)

4bdm 

(e)

longitudinally with corrugations Helically applied tape, not overlapped Helically applied flat tape, overlapped (See Note 3) Corrugated tape, longitudinally applied Tubular sheath  NOTE 1—   A is the effective cross-sectional area, shield, or sheath B is the tape overlap (in mils) (usually 375)  b is the thickness of ttape ape (in mils) dis  is the diameter over semiconducting insulation shield (in mils) dm  is the mean diameter of shield or sheath (in mils) ds  is the diameter of wires (in mils) w is the width of tape (in mils) n is the number of serving or braid wires or tapes L is the overlap of tape (in percentage)

 NOTE 2—  The The effective area of composite shields is the sum of the effective areas of the components. For example, the effective area of a composite shield consisting of a helically applied, not overlapped tape and a wire serving would be the sum of the areas calculated from Equation (b) (b)   of Table 11 11 and  and Equation (a) (a)   of Table 11.  11.   NOTE 3—  The The effective area of thin, helically applied overlapped tapes depends, also, on the degree of electrical contact resistance of the overlaps. Equation overlaps.  Equation (c)  (c)  of Table 11 11   may be used to calculate the crosssectional area of the shield of new cable. An increase in contact resistance may occur after cable installation or during service involving exposure to moisture and heat. Under these conditions the contact resistance may approach infinity, where Equation where Equation (b) of Table 11 could apply.

23  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

If practical, the test should be conducted using a duration of 0.17 s (10 cycles at 60 Hz). If the calculated fault current cannot be achieved due to equipment limitations, then an alternate current and time combination may be used to conduct the test as long as the alternate time and current have the same I 2t value as the originally calculated values and the alternate time (t) is not longer than 1 s. The test samples may be allowed to cool to ambient after the first short-time current test. All shield restoration components shall withstand two, full short-time current tests without signs of arcing of the metallic components, and without catching on fire. All metallic-shield restoration components must also remain intact. Slight melting of polymeric components is allowed as long as no material leaves the cable.

7.13.2 Cable jacket restoration seal integrity The following procedure is used to qualify cable jacket restoration components for seal integrity. If this test is being performed in conjunction with the metallic-shield restoration component test of 7.13.1, 7.13.1, the following procedure would be performed following the two short-time current tests of that subclause. If this test is being performed to qualify a cable jacket restoration seal design exclusive of any metallic-

shield components, the following procedure would be performed following the partial discharge test and, if applicable, the sectionalizer test. The cable jacket restoration assemblies that were cyclically aged in-air for 30 cycles shall be completely submerged in ambient temperature tap water for 24 h. The minimum depth of water shall be 0.3 m (1 ft) for extruded cable joints rated 2.5 kV to 46 kV and 1 m (3 ft) for all other joints. This depth corresponds to the submersion depth required during the load cycle test of 7.9.1 and 7.9.1 and 7.9.2 for 7.9.2 for each joint construction and is measured from the top surface of the joint. The assemblies shall then be subjected to an additional ten thermal cycles with current of magnitude equal to the cyclic aging current requirements used for 7.9.1 or 7.9.1 or 7.9.2. It 7.9.2.  It is not necessary to apply the continuous, ac phase-to-ground voltage of 7.9.1 or 7.9.1 or 7.9.2. 7.9.2. Afterward,  Afterward, the assemblies shall be removed from the water and the external surfaces fully dried. Within 2 h of removal from the water, the environmental seals shall be removed and the moisture sensitive tape examined. The cable jacket restoration/environmental restoration/environmental seal component design is acceptable if there is no evidence of water migration beyond the water block area as determined by the color of the moisture sensitive tape.

7.14 Connector thermal and mechanical tests Connectors used in cable joints used to join two aluminum conductors or an aluminum conductor to a copper conductor, shall meet all Class-A current cycle requirements given in ANSI C119.4. In addition, connectors to join two aluminum conductors or an aluminum conductor to a copper conductor, for use in any cable joint excluding pipe-type, laminated dielectric cable joints, shall meet all Class-2  partial tension requirements given in ANSI C119.4. The tensile strength requirements for connectors used in pipe-type laminated dielectric cable joints must be established between the supplier and the end user. The manufacturer should follow a similar test protocol to verify that connectors used between copper conductors will perform reliably in service.

24  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

Annex A (informative) Typical values of heat-shrinkable and multi-component cold-shrink joint component tests and sampling rates Table A.1—Heat-shrink and multi-component cold-shrink joint component tests and requirements Shrinkable tubing or molded component

Visual examination

Reference

7.2.1

Stress control

Conductive

Insulating

Protective

 No splits, pinholes, incl inclusions, usions, or other defects

Dimensions (%) Expanded (min/max wall thickness ratio)

7.2.2

≥ 60

≥ 60

≥ 60

≥ 60

Recovered (min/max wall thickness ratio)

7.2.2

≥ 80

≥ 80

≥ 80

≥ 80

Length change after recovery

7.2.2

≤ 15

≤ 15

≤ 15

≤ 15

Tensile strength (MPa)

7.2.3

≥ 10

≥ 10

≥ 10

≥ 10

Elongation at break (%)

7.2.3

≥ 200

≥ 200

≥ 200

≥ 200

Volume resistivity (Ω-cm)

7.2.4 7.2.4  

—

≤ 50k

—

—

Dielectric strength (kV/mm)

7.2.5 7.2.5  

N/A

N/A

≥ 10

—

Table A.2—Heat-shrink and multi-component cold-shrink joint component sampling rates Length of lot size (m)

Sampling size (pieces)

1 to 500

2

501 to 2 000

4

2 001 to 5 000

7

5 001 to 10 000

10

> 10 000

15

25  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

Annex B (informative) Typical values of elastomeric taped joint component tests and sampling rates Table B.1—Taped joint component tests and requirements Voltage class of tape

Up to 35 kV

Up to 138 kV

Up to 325 kV

Semiconductive

II

III

V

IV

7.3.1

2 mm

2 mm

2 mm

2 mm

7.3.2.1

≥ nominal

≥ nominal

≥ nominal

≥ nominal

Reference

ASTM tape classification Fusion (max flag) Dimensions (acceptable variations from nominal) Length

Width

7.3.2.2

± 0.76 mm

± 0.76 mm

± 0.76 mm

± 0.76 mm

Thickness (avg)

7.3.2.3

± 0.076 mm

± 0.076 mm

± 0.076 mm

± 0.076 mm

Tensile strength (MPa, min)

7.3.3 7.3.3  

1.7

1.7

2.4

0.69

Elongation at break (min %)

7.3.3

500

700

700

300

Volume resistivity (Ω-cm, min)

7.3.4 7.3.4  

—

—

—

103 

Dielectric strength for 0.76 mm thickness (kV/mm, min)

7.3.5

20

24

28

N/A

Table B.2—Taped joint component sampling rates Number of rolls in shipment

Number of sample rolls

50 to 200

2

201 to 500

3

501 to 1000

4

1001 to 5000

50

26  Copyright © 2007 IEEE. All rights reserved.

 

IEEE Std 404-2006 IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V

Annex C (informative) Bibliography [B1]  ASTM D4388-02, Standard Specification for Nonmetallic Semi-Conducting and Electrically Insulating Rubber Tapes. Tapes.11  [B2]  CEI/IEC 60502-4, 60502-4, Power Cables with Extruded Insulation and Their Accessories for Rated Voltages from 1 kV up to 30 kV. 12  [B3]  CEI/IEC 60840, Power Cables with Extruded Insulation and Their Accessories for Rated Voltages above 30 kV up to 150 kV. k V. [B4]  ICEA S-94-649, Standard for Concentric Neutral Cables Rated 5,000–46,000 Volts. 13 

[B5]  ICEA S-97-682, Standard for Utility Shielded Shielded Power Cables Rated 5 Through 46 kV. [B6]  ICEA S-108-720, Standard for Extruded Insulation Power Cables Rated Above 46 kV Through 345 kV. [B7]  IEEE 100™, The Authoritative Dictionary of IEEE Standard Terms, Seventh Edition.14, 15  [B8]   NEMA WC 3/ICEA S-19-81 (Reaff 1992), Rubber-Insulated Wire and Cable for the Transmission and Distribution of Electrical Energy. Energy.16  [B9]   NEMA WC 5/ICEA S-61-402, Thermoplastic-Insulated Thermoplastic-Insulated W Wire ire and Cable for the Transmission and Distribution of Electrical Energy. [B10]  NEMA WC 7/ICEA S-61-524, S-61-524, Cross-Linked Thermosetti Thermosetting-Polyethylene-I ng-Polyethylene-Insulated nsulated Wire and Cable for the Transmission and Distribution of Electrical Energy. [B11]  NEMA WC 8/ICEA S-68-516, Ethylene-Propylene-Rubber-Insulat Ethylene-Propylene-Rubber-Insulated ed Wire and Cable for the Transmission and Distribution of Electrical Energy.

11

  ASTM publications are available from the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, USA (http://www.astm.org/). Conshohocken, 12  CEI/IEC publications are available from the Sales Department of the International Electrotechnical Commission, Case Postale 131, 3, rue de Varembé, CH-1211, Genève 20, Switzerland/Suisse (http://www.iec.ch/). IEC publications are also available in the United States from the Sales Department, American National Standards Institute, 11 West 42nd Street, 13th Floor, New York, NY 10036, USA. 13  ICEA publications are available from ICEA, P.O. Box 20048, Minneapolis, MN 55420, USA (http://www.icea.org/). 14  IEEE publications are available from the Institute of Electrical and Electronics Engineers, 445 Hoes Lane, Piscataway, NJ 088551331, USA (http://standards.ieee.org/). 15  The IEEE standards or products referred to in this clause are trademarks of the Institute of Electrical and Ele ctronics Engineers, Inc. 16   NEMA publications are available from Global Engineering Documents, 15 Inverness Way East, Englewood, CO 80112, USA (http://global.ihs.com/).

27  Copyright © 2007 IEEE. All rights reserved.