T&C Procedure for Transformer

MTR CORPORATION / CONTRACTOR Contract No. 3288.66-02E Upgrade & Reinforcement of Power Supply System at PRE & ADM

DAR NO:

DESIGN APPROVAL REOUEST DATE FORWARDED TO MTRC:

C3288.66-02E/06/02/01/07/001

10 Sep. 03

CONTRACTOR REF:

RELEVANT CLAUSE(S) IN THE PS: N/A

3536-L/03/P041/05/02 SUBJECT Design Submission DOCUMENT SUBMITTED: T & C Procedure for Transformer DETAILS: Site testing procedure for transformer (10 pages)

Hill1111111111111 lii IDlI!111111111111 l111111111 MTRC (LL) 0000038500

ANSWER REQUIRED BY (TO AVOID DELAY): 9 Oct 2003

INITIATED BY: Danny Yuen

SIGNED BY: Danny Yuen Project Manager

MTRC USE ONLY: LEAD DESIGNER

DATE RECEIVED BY MTRC:

SIGNATURE: DATE RETURNED TO CONTRACTOR:

Updated: 9/10/2003 2:12 PM

F LEPEP

MTRC CONTRACT NO. C3288.66-02E Upgrade and Reinforcement of Power Supply System at PRE and ADM Date: 9 Sept 2003 DAR No. C3288.66-02E/06/02/01/07/001 Rev. 0 Site Testin2 Procedure for Transformer

I.

CONSTRUCTION INSPECTION General inspection for the construction of the transformer shall be carried out as per the check list in the test form.

2.

VISUAL CHECK OF EARTH CONTINUITY Check the earthing connection of the transformer frame, HV & LV cable box, LV neutral, control and marshalling cubicle visually.

3.

INSULATION RESISTANCE BEFORE PRESSURE TEST Insulation resistance test (Megger Test) for HV to LV windings, HV & LV windings to earth shall be tested by 5kV d.c. megger tester before pressure test.

4.

PRESSURE TEST AC high voltage shall be increased gradually to 19.2kV between I IkV to 415V/earth and to 3 .5kV between 415V to 11 kV/earth for I minute.

5.

INSULATION RESISTANCE AFTER PRESSURE TEST Insulation resistance test (Megger Test) for HV to LV windings, HV & LV windings to earth shall be tested by 5kV d.c. megger tester after pressure test.

6.

TRANSFORMER RATIO TEST Check the transformer ratio by connecting a three-phase, four wire, low voltage supply (auto-transformer) to the H.V. terminals. Measure and record the data at the L.V. side.

7.

VECTOR GROUP CHECK Measure the phase voltages for HV & LV side (refer to the test form) to check the vector group of the transformer.

8.

FUNCTION TEST ON TEMPERATURE INDICATORS (A). Check the Winding Temperature Indicator 1. Adjust and calibrate the winding temperature indicators. Insert a thermometer (as reference) and the winding temperature indicator in boiling oil. Record the readings of the thermometer and calibrate the indicator.

FILE NAME: Transformer

Page I of 10

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MTRC CONTRACT NO. C3288.66-02E Upgrade and Reinforcement of Power Supply System at PRE and ADM Date: 9 Sept 2003 DAR No. C3288.66-02E/06/02/01/07/001 Rev. 0

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2. Simulate winding temperature alarm with boiled oil. The winding temperature alarm contact closes. Record the switch setting with the reading of thermometer. (Alarm setting 1050 C) 3. Simulate winding temperature trip with boiled oil. The winding temperature trip contact closes. Record the switch setting with the reading of thermometer. (Trip setting 11 50 C) (B). Check the Liquid Temperature Indicator 1. Adjust and calibrate the liquid temperature indicators. Insert a thermometer (as reference) and the liquid temperature indicator in boiling oil. Record the readings of the thermometer and calibrate the indicator. 2. Simulate liquid temperature alarm with boiled oil. The liquid temperature alarm contact closes. Record the switch setting with the reading of thermometer. (Alarm setting 85 0 C) 3. Simulate liquid temperature trip with boiled oil. The liquid temperature trip contact closes. Record the switch setting with the reading of thermometer. (Trip setting 950 C )

9.

WINDING RESISTANCE MEASUREMENT Measure the winding resistance for H.V. side and L.V. side.

10.

PHASE SOUENCE CHECK & OUTPUT VOLTAGE MEASUREMENT Check the phase sequence at L.V. side by phase sequence meter. Measure the output voltage at L.V. side.

11.

NOISE LEVEL MEASUREMENT Check the noise level with the transformer on no load at rated voltage and frequency. The position of the noise level meter shall be I metre from transformer body.

FILE NAME: Transformer

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MTRC CONTRACT NO. C3288.66-02E Upgrade and Reinforcement of Power Supply System at PRE and ADM Date :9 Sept2003 DAR No. C3288.66-02E/06/02/01/07/001 Rev. 0 12.

A,

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STANDBY EARTH FAULT C.T. TEST Test the CT magnetisation with a.c. voltage to measure the knee point voltage. Test the ratio of CT up to 100% rated current by primary injection. Check insulation resistance and measure resistance of CT.

13.

INSULATING OIL SAMPLE TEST Test the insulating oil sample in compliance with IEC 60156 (Dielectric Test) & IEC 60814 (Water Content Test) by accredit laboratory.

FILE NAME: Transformer

Page 3 of 10

MTRC CONTRACT NO. C3288.66-02E Upgrade and Reinforcement of Power Supply System at PRE and ADM Date: 9 Sept2003 DAR No. C3288.66-02E/06/02/01/07/001 Rev. 0

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"

Transformer Site Test Report Date of Testing

Site Location

:

Voltage Ratio

11000/433V

Serial No.

Transformer Rating

1500KVA

Vector Group

Place of Manufacture 1.

:

Cooling Type

CONSTRUCTION INSPECTION

_

: Dynll

: ONAN RESULT

- Check Transformer Body - Check HV & LV Cable Box - Check Standby Earth CT & Bushing - Check Cable Terminal Condition - Check Winding Temperature Indicator - Check Liquid Temperature Indicator - Check the Condition of Liquid Level Gauge - Check Gasket Joints Transformer Tank Joint Cable Box Covers Valve Flanges & Pipe Joints - Check Liquid Drain Valves are closed - Check Pressure Relief Valve - Check Radiator Valves are fully opened 2.

VISUAL CHECK OF EARTH CONTINUITY

RESULT

- Check Transformer Frame - Check HV Cable Box - Check LV Cable Box - Check LV Neutral - Check Control and Marshalling Cubicle 3.

INSULATION RESISTANCE BEFORE PRESSURE TEST (Megger Test) Using a 5kV Megger HI.V. Windings (I IkV) to Earth (5kV) LV. Windings (415V) to Earth (IkV) H.V. Windings to L.V. Windings (5kV) Control Circuit to Earth (0.5kV)

FILE NAME: Transformer

RESULT

0 0 0 0

Page 4 of 10

LP

MTRC CONTRACT NO. C3288.66-02E

MP

Upgrade and Reinforcement of Power Supply System at PRE and ADM

Date: 9 Sept 2003

DAR No. C3288.66-02E/06/02/01/07/001 Rev. 0

RESULT

PRESSURE TEST

4.

mA nmA

11kV to 415V/earth (19.2kV AC I mins.) 415V to I IkV/earth (3.5kV AC I min.)

RESULT

INSULATION RESISTANCE AFTER PRESSURE TEST (Megger Test)

5.

Using a 5kV Megger H.V. Windings (I kV) to Earth (5kV) L.V. Windings (415V) to Earth (IkV) H.V. Windings to L.V. Windings (5kV)

Q

0 0

TRANSFORMER RATIO TEST

6.

Connect a three-phase, four wire, low voltage supply (auto-transformer) to the H.V. terminals, the following data is recorded: T A

P

.

.

1 2 3 4

415 415 415 415

415 415 415 415

5

415

415

415 415 415 415 415

CAL 15.52 15.93 16.34 16.75 17.16

FILE NAME: Transformer

ACT

CAL 15.52 15.93 16.34 16.75 17.16

ACT

CAL 15.52 15.93 16.34 16.75 17.16

ACT

CAL 8.96 9.20 9.43 9.67 9.91

c-n

b-n

a-n

b-ca-c

a-b

A-C

B-C

A-B

LV PHASE VOLTS

LV LINE VOLTS

APPLIED HV LINE VOLTS

ACT

_

CAL 8.96 9.20 9.43 9.67 9.91

ACT

Page 5 of 10

CAL 8.96 9.20 9.43 9.67 9.91

ACT

MTRC CONTRACT NO. C3288.66-02E Upgrade and Reinforcement of Power Supply System at PRE and ADM Date: 9 Sept 2003 DAR No. C3288.66-02E/06/02/01/07/001 Rev. 0 7.

VECTOR GROUP CHECK (refer to diagram 1) Theoretical calculation: AB = 415V BC = 415V CA = 415V ab = 16.34V bc = 16.34V ca = 16.34V Aa = OV Ab = 16.34V Ac = 16.34V Ba = 415V Bb = ' [AB 2 + ab2 - 2(AB)(ab)cos ZBAb] = I[4152± 16.342- 2(415)(16.34)cos 300] = 401V

ZBAb

=

300

ZAcC

=

300

ZbcC

=

151.16°

Bc = Bb = 401V Ca = 415V Cc = I [AC 2 + Ac2 - 2(AC)(Ac)cos ZAcC] = 1[4152+ 16.342- 2(415)(16.34)cos 30°] = 401V Cb

4 [Cc 2 + bc2 - 2(Cc)(bc)cos

ZbcC] 4 [4012+ 16.342- 2(401)(16.34)cos 151.160] = 415.4V = =

Bc 401 sin3O0

ZAcB ZbcB

=

sin

Ba sin ZAcB

=

sin3O0

ZBcC

415 sin ZAcB

(415 4 401) 2

ZBcC 2

62.320

=

148.840 ZAcB - 600 88.840

= =

=

ZbcC = /bcB + ZBcC = 151.160 Calculated

A-B 415

Volt

___

B-C 415

C-A 415

B-b 401

B-c 401

C-b 415.4

C-c 401

Measured Volt

___

A at HV side is connected to Phase a at LV side during testing. *. Neutral terminal at LV side is isolated to earth during testing. *. Phase

FILE NAME: Transformer

Page 6 of 10

MTRC CONTRACT NO. C3288.66-02E Upgrade and Reinforcement of Power Supply System at PRE and ADM Date: 9 Sept 2003 DAR No. C3288.66-02E/06/02/01/07/001 Rev. 0

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Diagram 1

Aa

FILE NAME: Transformer

Page 7 of 10

,

MTRC CONTRACT NO. C3288.66-02E Upgrade and Reinforcement of Power Supply System at PRE and ADM Date: 9 Sept 2003 DAR No. C3288.66-02E/06/02/01/07/001 Rev. 0 8.

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RESULT

FUNCTION TEST ON TEMPERATURE INDICATORS (A). Check the Winding Temperature Indicator 1. Adjust and calibrate the winding temperature indicators. Insert a thermometer (as reference) and the winding temperature indicator in boiling oil. Record the readings of the thermometer and calibrate the indicator. 2. Simulate winding temperature alarm with boiled oil. The winding temperature alarm contact closes. Record the switch setting with the reading of thermometer. (Alarm setting 105 0C) 3. Simulate winding temperature trip with boiled oil. The winding temperature trip contact closes. Record the switch setting with the reading of thermometer. (Trip setting 11 50 C) (B). Check the Liquid Temperature Indicator 1. Adjust and calibrate the liquid temperature indicators. Insert a thermometer (as reference) and the liquid temperature indicator in boiling oil. Record the readings of the thermometer and calibrate the indicator. 2. Simulate liquid temperature alarm with boiled oil. The liquid temperature alarm contact closes. Record the switch setting with the reading of thermometer. (Alarm setting 850 C) 3. Simulate liquid temperature trip with boiled oil. The liquid temperature trip contact closes. Record the switch setting with the reading of thermometer. (Trip setting 95 0 C)

9.

WINDING RESISTANCE MEASUREMENT H.V. Side

A-B1 B-C A-C

L.V. Side

a-b b-c a-c

FILE NAME: Transformer

a-n b-n c-n

Page 8 of 10

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MTRC CONTRACT NO. C3288.66-02E Upgrade and Reinforcement of Power Supply System at PRE and ADM Date: 9 Sept 2003

DAR No. C3288.66-02E/06/02/01/07/001 Rev. 0

10.

PHASE SEQUENCE CHECK & OUTPUT VOLTAGE MEASUREMENT (Measured after energization) Phase Sequence Check Secondary Output Voltage

11.

RY

YB

RB

RN

YN

BN

NOISE LEVEL MEASUREMENT Check the noise level with the transformer on no load at rated voltage and frequency. The position of the noise level meter shall be 1 metre from transformer body. Ambient Noise Level: _dB Noise (dB) at 1/2 tank height

Position of Tester East South West North

12.

STANDBY EARTH FAULTC.T. TEST

Substation: Transformer No: Current Ratio:

Rating:

Serial No._

I. Inject a.c. voltage to CT coil to measure the knee point voltage Neutral C.T. V A

FILE NAME. Transformer

Page 9 of 10

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MTRC CONTRACT NO. C3288.66-02E Upgrade and Reinforcement of Power Supply System at PRE and ADM Date: 9 Sept 2003 DAR No. C3288.66-02E/06/02/01/07/001 Rev. 0 2. Inject primary current to test the C.T. accuracy

OHM

MEASURED SECONDARY CURRENT (A)

INJECTED PRIMARY CURRENT (A)

CT RESISTANCE 25%

75%

50%

100%

25%

50%

75%

3. CT Insulation Test (500V d.c.) CT to Earth 13.

M ohm

INSULATING OIL SAMPLE TEST Referring to the attached test report from accredit laboratory: Dielectric Test

Result:

Water Content Test

Result:

Tested by:

Signed:

Witnessed by: MTRCL Representative

Signed:

Date Approved by: MTRCL Representative

Signed:

Date

FILE NAME: Transformer

Page 10 of 10

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