Substation Site Test

SCECO CENTRAL TRANSMISSION DEPARTMENT STANDARD PROCEDURE 1 2 INDEX NUMBER T/P&T

DATE OF ISSUE

3 65820

4a

4b

235 / 62

5 99

6 Ro

2 JUNE 1994

TITLE:

GUIDE LINES TO SITE PRE-COMMISSIONING TESTS AT NEW SUBSTATION PREPARED BY:

ENGR. MUKHTAR ENGINEER

CONCURRED BY:

APPROVED BY:

SALEH AL-GHUNAIMI MANAGER

P&T66/nars

ABDUL RAHMAN A. AL-BASSAM DIRECTOR

Specification No: T/P&T.65820.235/62.99.RO

Rev. No:

SCECO CENTRAL TRANSMISSION DEPARTMENT DISTRIBUTION OF STANDARD PROCEDURES LOCATION

DATE

HEAD OFFICE DISTRIBUTION DEPARTMENT HEAD OFFICE TECHNICAL STUDIES AL QASEEM AL-AFLAG AL-DAWASIR AL-KHARJ SUB STATIONS OPERATIONS NETWORK PROTECTION AND TESTING PROGRAMMING AND RESOURCES

P&T66A/nars

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Specification No: T/P&T.65820.235/62.99.RO

Rev. No:

SCECO (CENTRAL) TRANSMISSION DEPARTMENT STANDARD PROCEDURE

1.0

INTRODUCTION:

1.1

PURPOSE All electrical equipment installed in newly build substation is necessary to test and inspect according to the site test procedure being presented here.

1.2

OBJECTIVES To keep the contractors testing work in line with SCECO requirements, so that no equipment is left unchecked before energization.

1.3

APPLICATION Contractors and SCECO witnessing staff should follow the attached guide line for precommissioning tests so that no test is forgotten and equipment remained unchecked. The guide line specifies all kinds of site test to be performed on most of the S/S equipment meant for transmission of electrical power.

GUIDE LINE TO SITE PRE-COMMISSIONING

TESTS AT NEW SUBSTATION For newly being built Substation by Contractors under Turnkey Projects or extension to existing Network. Following Site Pre-Commissioning Tests should be performed by the Contractor regarding specified equipment as under:

SPRO-10/nars

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Specification No: T/P&T.65820.235/62.99.RO

Rev. No:

SERIAL NUMBER

TEST OBJECT

TEST NO.

1.

Lv power cables

a.

Phasing & Continuity check.

b.

2kV Megger test.

c.

Visual inspection, size & ratings confirmation Main Circuit Continuity test for tightness of Joints and bolts.

2.

Lv switch, switch gear

a. b.

c. 3.

4.

Mcbs in lv ac panels control & protection panels of all voltage ratings

Meters in lv panels

TEST DESCRIPTION

Main circuit insulation Resistance Measurement by 2kV Megger or 2kV A.C.H.V. Test for one minute. Phasing check.

a.

Visual inspection drawings.

b.

2, 3 time ON/OFF hand operation.

c.

Trip test in each Phase by over current injection and noting the Trip time.

a.

All Ammeters and Volt Meters should be Calibrated at 20%, 50% & 100% of FSD. All C.Ts to be checked for ratio test at least. All selector switches should be checked for R, Y, B & N position and its labels. All secondary wiring to be Meggerred.

b. c. d.

CH3/nars

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of

ratings

as

per

Specification No: T/P&T.65820.235/62.99.RO

SERIAL NUMBER 5.

TEST OBJECT

13.8/33KV SWITCHGEAR

Rev. No:

TEST NO.

TEST DESCRIPTION

a.

Main circuit resistance Measurement including ciucuit breakers and check against Factory test results.

b.

A.C. H.V. Test for the Main Circuit with Circuit Breaker in close position and then open position also.

c.

All Voltage transformers tobe checked for insulation resistance winding resistance, Ratio Polarity and A.C. H.V. Test at 1.5 Un at no burden. All 13.8kV panel meters like Ampere Amp MDIS, KV, MW, Mvar, Transducers e+ to be calibrated. All relevant C.Ts should be checked for Mag. curve ratio polarity.

d.

e. f.

For Secondary wiring 1kV Megger Test.

g.

Phasing check for V.T. Secondary Circuits on relevant meters.

h.

All MCBs AC/DC in the panel to be checked.

i.

Check against drawings Contract SpecSpecification, the Instrument & Equipment ratings.

CH3A/nars

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Specification No: T/P&T.65820.235/62.99.RO

SERIAL NUMBER 6.

TEST OBJECT P/transformer switchgear

Rev. No:

TEST NO. n.

o. p.

q. r.

s.

t. u.

TEST DESCRIPTION Fan Motors current to be Measured and check against rating also check wiring size suitable to carry the currents. MCBs in Cooler Control Cubical to be checked by current injection for trip test. Check oil level in main tank tap changer tank, Bushing etc. Test the oil level gauges and its alarms. Check earthing of Transformer wheel stopper, silica gel color blue etc. Check wiring size of Supply Cable of Fans Motors and Main MCBs and incoming cable. Run all Fans together and then measure current in all wires of Fan Motors and input supply cables. Check no temperature arises on the Supply Wires. Check Main MCCB in L.V. Distribution Panel is of correct rating to Supply the Transformer auxiliaries. Labelling: All auxiliary devices to be labelled as shown in relevant drawing and actual name should be written on the labels like Oil Temp. Gauge, Winding Temp. Gauge, pressure relief valve etc. All Cable should be marked R, Y, B in big letters on H.V. side and small letter on L.V. side. Name plate data should be complete and installed at Mains light visible place. Check for oil leakage, radiator valves open position, Colour of Transf. or any bending of body. Oil pockets of Thermosens of Gauges, have oil inside etc.

CH3C/nars

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Specification No: T/P&T.65820.235/62.99.RO

SERIAL NUMBER 7.

TEST OBJECT Auxiliary transformer

Rev. No:

TEST NO.

TEST DESCRIPTION

a. b. c.

Ratio Test and Megger Test 5kV on H.V. Side and 1kV at L.V. side. Vector group Test. Return to normal Tap.

d.

Check against Contract Specification.

e.

Check oil level and its indication alarms.

f.

Check oil temperature gauge by actual heating process and its alarms. Check L.V. Side MCB Setting as per Transformer rating 20% above check its on off. Check all devices labelled correctly as per drawing. Check oil level in H.V. Side Cable box and its oil level indicator.

g.

h. i.

8.

9.

10.

Neutral resistors

earthing

13.8kv & power cable

33kv

132kv cables oil filled cables

j.

Check earthing, Colour, Painting external damage, oil leakage, wheel stopper, cable connection etc.

a.

Megger Test.

b.

Resistance Measurement.

c. a.

Inside visual inspection for any insulator broken. Sheath Meggering & Continuity Test

b.

Megger Test for Cable Cores.

c.

Phasing Test.

d.

H.V. Test.

a.

Oil Flow Test.

b.

Impregnation Test.

c. d. e.

Conductor Resistance Test. Capacitance Test. Sheath Meggering.

f.

Cross bonding Test.

CH3D/nars Page 7 of 9

Specification No: T/P&T.65820.235/62.99.RO

10.

11.

12.

132kv cables filled cables

oil

132kv xlpe cables

132kv 380kv 220 kv g.i.s.

Rev. No:

g.

Tightness oflinks in J/Boxes.

h.

Test for S.V.L.

i.

High Voltage Test.

a.

Megger Test.

b. c.

Conductor Resistance, Capacitance and Inductance Test. Sheath JR Test.

d. e.

Cross Bonding Test. Link box tightness check.

f.

S.V.L. Test.

g.

H.V. Test.

a. b.

A.C. high voltage test on Main Circuit with Partial Discharge Measurement. Main Circuit Resistance Test.

c.

Megger Test on Auxiliary Circuits.

d.

SF6 Leakage Test.

e.

Measurement of SF6 Moisture Contents.

f. g.

Checks and verification against approved Specification. C.Bs Timing Test (Open & Close).

h.

Checks on SF6 gas pressure gauge.

i.

Checks on C.B. hydraulic system.

j.

G.I.S. V.Ts Test for Meggering, Ratio Polarity, Winding Resistance and 1.5 Un H.V. Test. All MCBs A.C. and D.C. to be tested in its Control Cubicle. V.Ts Secondary MCB Test & Phasing Check. G.I.S. Earthing, Paint, any external damage, etc. check.

k. l. m.

CH3E/nars Page 8 of 9

Specification No: T/P&T.65820.235/62.99.RO

13.

14.

15.

Pilot cables

Voltage transformers 13.8kv, 33kv, 132kv, 220kv, 380kv rating

Measurands

Rev. No:

a.

Megger Test.

b.

Loop Resistance Test.

c.

Cross Talk Test and Coupling Test.

d.

Noise Level Measurement.

a.

Megger Test.

b. c.

Ratio Test.

d. e.

Polarity Test. H.V. Test with P.D. Test upto 1.5 Un only.

f.

Secondary circuit MCBs Test and Phasing Checks. For indicating Meters: Voltage or current to be injected at 25%, 50%, 100%, of FSD. Precision ref. meters should be used for calibration checks. For integrating Meters. Time power Meters along with precision REF. Energy Meters to be used to check KWH Meters.

a.

b. c.

Winding Test.

CH3F/nars

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