Annexure 4 - Transformer

T P DIVISION TRANSMISSION COMMISSIONING DEPARTMENT SITE TEST REPORT

CONTRACT NO: NAME OF SUB STATION: Main Contractor Name of Bay:

Page no: Consultant: Equipment: Inter Distribution Transformer(IDT) Manufacturer SCADA No: Date

DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

INDEX

Sl.No. Item Format No. 1 Transformer general data DEWA/TP/TCD/IDT/ST/2 2 Final checks after energization DEWA/TP/TCD/IDT/ST/3-A 3 Final checks prior to energization DEWA/TP/TCD/IDT/ST/3-B 4 Initial Checks (to be done prior to starting site testing) DEWA/TP/TCD/IDT/ST/4 5 Site processing details DEWA/TP/TCD/IDT/ST/4 6 Visual inspection DEWA/TP/TCD/IDT/ST/5~7 7 Insulation Resistance measurement of Transformer (Winding &core) DEWA/TP/TCD/IDT/ST/8 8 2kV test on core and clamping structure DEWA/TP/TCD/IDT/ST/89 Ratio and Vector group tests DEWA/TP/TCD/IDT/ST/910 Magnetizing current measurement DEWA/TP/TCD/IDT/ST/10 11 Winding Resistance measurement DEWA/TP/TCD/IDT/ST/11 12 Short circuit Impedance measurement DEWA/TP/TCD/IDT/ST/12 13 Measurement of Tan delta and Capacitance of Winding DEWA/TP/TCD/IDT/ST/13 14 Measurement of Tan delta and Capacitance of Bushings DEWA/TP/TCD/IDT/ST/1315 Calibration of Temp. Indicators DEWA/TP/TCD/IDT/ST/1416 Hot spot Gradient check of Winding Temperature indicators DEWA/TP/TCD/IDT/ST/15 17 Ratio check of CTs for winding temperature indicators DEWA/TP/TCD/IDT/ST/15 18 Measurement of transducer out put for Remote Temp. Indicator DEWA/TP/TCD/IDT/ST/16 19 On load Tap changer- Operation checks DEWA/TP/TCD/IDT/ST/17 20 Tap position indication check DEWA/TP/TCD/IDT/ST/1821 Insulation resistance check of devices DEWA/TP/TCD/IDT/ST/1922 Fan Motor check DEWA/TP/TCD/IDT/ST/20 23 Operation check of cooling equipments DEWA/TP/TCD/IDT/ST/21 24 Protective device wiring/operation check DEWA/TP/TCD/IDT/ST/22 25 Cable box inspection DEWA/TP/TCD/IDT/ST/23 26 Checks on AVR DEWA/TP/TCD/IDT/ST/24~2527 Tap changer & cooler alarms / indications check DEWA/TP/TCD/IDT/ST/26 28 Tap Changer Parallel operation checks DEWA/TP/TCD/IDT/ST/27~28 29 Oil leak test DEWA/TP/TCD/IDT/ST/29 30 BDV test on insulating oil DEWA/TP/TCD/IDT/ST/30 31 Test results/properties of Insulating oil before filling in Transformer DEWA/TP/TCD/IDT/ST/31 32 Tests on transformer oil after complete site processing DEWA/TP/TCD/IDT/ST/32 33 DGA test on Transformer oil DEWA/TP/TCD/IDT/ST/33 34 Check on small wiring DEWA/TP/TCD/IDT/ST/34 35 Checks during Fire Deluge operation DEWA/TP/TCD/IDT/ST/34 36 Frequency response analysis DEWA/TP/TCD/IDT/ST/35

Checked By Verified By Verified By

Signature

Name

Organization Consultant DEWA DEWA/TP/TCD/IDT/ST/1

TP / TCD / QP01-A042012 Revision

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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

1.0 TRANSFORMER GENERAL DATA HV LV

RATING ONAN / ONAF MVA

NOMINAL VOLTAGE kV

FULL LOAD CURRENT (RATED TAP) A

VECTOR GROUP

SHORT CIRCUIT IMPEDANCE HV/LV Max. Tap ( 1 ) Rated Tap ( ) Min. Tap ( )

TYPE/FORM (given by manufacturer)

YEAR OF MANUFACTURE

ZERO SEQUENCE IMPEDANCE

NO OF TAPS

NO OF FANS

NO OF PUMPS

NO OF RADIATORS

TYPE OF OIL

TOTAL OIL QUANTITY

BREATHER TYPE

OLTC MAKE / MOTOR

OLTC TYPE / MOTOR

TOTAL WEIGHT

CONSERVATOR TYPE

NEUTRAL GROUNDING METHOD

TRAFO TYPE (ICT, IBT, IDT Etc.)

SUB STATION VOLTAGE

TYPE OF ROOF

OLTC COUNTER READING

COMMISSIONING DATE OF TRANSFORMER.

Checked By Verified By Verified By

Signature

Name



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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

2.0 FINAL CHECKS (To be carried out after energization) Date:

1. Check for any abnormal sound in the transformer after commissioning

2. Check for any abnormality during OLTC tap operation

3. Check/Ensure no persisting alarms at the AVR & HMI

4. Oil Temperature Indicator reading C

5. HV Winding Temperature Indicator Reading C

6. LV Winding Temperature Indicator Reading C

7. Remote Winding Temperature Indicator Reading C

2.1 FINAL CHECKS (To be carried out during Load Test) Date:

1. Load Test current in the Transformer Amps

2. HV WTI Ammeter Reading Amps

3. LV WTI Ammeter Reading Amps

4. RWTI Ammeter Reading Amps

5. HV WTI circuit current measurement using clamp meter Amps

6. LV WTI circuit current measurement using clamp meter Amps

7. RWTI circuit current measurement using clamp meter Amps

8. Oil Temperature Indicator reading C

9. HV Winding Temperature Indicator Reading C

10. LV Winding Temperature Indicator Reading C

11. Remote Winding Temperature Indicator Reading C

Calibration Details Checked By Witnessed By Witnessed By

Signature

Name Organization Consultant DEWA

DEWA/TP/TCD/IDT/ST/3-A


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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

3.0 FINAL CHECKS (To be carried out prior to energization) Correctness of oil level in all bushings and oil filled chambers.

All air release plugs (including radiators)& Buchholz relays vented

Pressure relief diaphragm intact

All bushing connections & test tap tightness checked

Neutral & Transformer Earth connection satisfactory

Position of all switches in MK & MDU ON position.

All CT connections are through / shorted & CT test windings open

WTI Ammeter circuit link connections are correct *Link Open loop resistance: *Link Closed Loop resistance:

No damage for insulators and clean

No oil leakage

Rating, diagram, Id plates fitted satisfactorily

Ensure that the silica gel is enviro gel type

Breathers satisfactory, oil level correct to the mark and pipe work joint is tight

All cabling and wiring visually satisfactory

All valves are in correct operational position with respect to valve schedule diagram (Ensure valves on both sides of relay and to HV cable box are open).

All valves labeled & locked and blanking covers provided wherever necessary

All protective and cable box covers fitted.

All pre-commissioning tests (including oil tests) completed & results are satisfactory.

Condition of Gland earthing of all cables in MK & MDU shall be satisfactory.

Permanent Identification tags for all control cables on both ends

Availability of marked up drawing copy in MK , MDU & & Record room

All openings (cable entry) in to AVR panel, MK and HV/LV cable box shall be closed.

Availability of power socket for oil filtration unit.

LV cable box connections shall be ensured

Ensure control cable gland and wiring connection tightness at device junction boxes and MK.

Record room verified for availability of records.

Locking of protective B relay & PRD released and locks if any are removed

No persisting alarms at AVR panel/ SCS /SCC (except VT supply absent)

*To be ensured by opening any one link in the CT circuit and entire path shall be measured with link in open and closed condition. Ensure link is closed and tightened after measurements.

Checked By Witnessed By Witnessed By

Signature


DEWA/TP/TCD/IDT/ST/3-B


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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

4.0 Initial check (To be done prior to starting the test) No Checks Remarks 1 Availability of safe receipt report from I & QA 2 Ensure safe transit based on shock recorder data 3 Ensure proper site processing 4 Positioning of anti vibration pad 5 Ensure uniform thickness of anti vibration pad 6 Availability of related Specification 7 Availability of approved drawings & installation manual 8 Availability of factory test reports 9 Maintaining site notes 10 Compliance of oil TC to DEWA reference oil (if TC is incomplete, test

shall be done at independent lab)

11 Verification of Minimum / maximum oil level alarm (shall be done during oil filling by simulating actual condition) a) Main conservator (MOLG/ Prismatic MIN/MAX alarm operation) b) Quantity of oil needed to achieve MAX alarm(Ltrs) c) Quantity of oil needed to be drained to achieve MIN alarm(Ltrs) d) Quantity of oil needed to be drained from MIN position to initiate MT Bucholz alarm (Ltrs) * e) OLTC conservator(MOLG/ Prismatic MIN/MAX alarm check)

5.0 Site processing Details ( Site processing shall be done as per the O&M Manual) Equipment details Make: Capacity: Sl No: Last Date conditioning of purifier

5.1. Initial oil treatment (in storage tank) records BDV Water content Tan delta Oil TC from refinery

TC No. 5.2 Vacuum/ Treatment details

Degree of vacuum (min) Duration (hrs) Maintained: Mfrs proposal: Maintained: Mfrs proposal:

5.3 Oil Circulation details of IDT & OLTC Date Time Oil temp (C) Vacuum (in

purifier) IR value of IDT.

Inlet Out let OTI Ambient

Attach separate sheet for balance recordings * Ensure minimum 20 - 30 litres available

Tested By Witnessed By Witnessed by

Signature


DEWA/TP/TCD/IDT/ST/4


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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

6.0 Visual Inspection No Check point Criteria Remarks/Date 6.1 Transformer main body 01 Phase identification label As per approved name plate 02 Rating & Valve Schedule plate Thickness:

Material

03

Accessories & Devices a) Identification b) Type form

(Enclose approved list showing type/form) As per GOA As per GOA/ Approved

04 Fan a) Rating b) Blades c) Fan guards d) Mounting of Fan

Galvanized steel/ Aluminum Shall be available at both sides Shall be independently mounted

with proper Anti vibration arrangement

05 Free space under fan 750mm (min) 06 Valves

a) Main Tank fill, filter & draining b) Sampling valves (top, bottom & cable box) c) Cable box fill, filter & draining d) OLTC fill, filter and & draining e) Hydran valve

Size of valves shall be 50mm 15mm 25mm 25mm 50 mm

07 Pressure relief device a) Make b) Operating pressure

Trafo OLTC Cable box

08 Bushing a) Make b) Rating

HV HVN LV

09 Neutral Earthing a) Touch potential insulation b) Size Earthing cable section

N bar shall be insulated (1 kV) 300mm2 (min)

10 Core and clamp bushing Shall be identified

Verified By Verified By Verified By

Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

No Check point Criteria Remarks/Date 11 Identification of devices MK & Enclosures Shall be identified as per GOA 12 Accessibility of components and devices Easy access shall be available for

buchholz, Bladder rupture, oil level indicators and MK components.

13 Linking and De-linking of LV Bus bar Easy accessibility shall be available inside LV cable box

14 Earth connection between tank and cover One connection shall be located near to core/ clamp earthing

15 LV Bus bar, flexible Neutral terminal and neutral bar

Shall be tin/ silver plated

16 Thickness of cable box and covers 4mm 17 OTI&WTI capillary tubes Shall be dressed properly using

stainless steel ties and shall be identified at both ends.

18 Labels 1) All external parts identification label shall be stainless steel 2) Device label shall be stainless steel

6.2 Marshalling Kiosk/ Motor Drive Unit 01 Contacts, components and other parts which

require periodic maintenance Accessibility shall be there for these contacts

02 Wiring Shall be neatly arranged in trunking 03 Spare terminals Min 20% spare shall be available 04 CT terminals Test barrels shall be available 05 Doors . 1) Shall be lockable type

2) Front window shall be glass & located such that view of indicators are obtained

06 Redundant supply Shall be available 07 Labels Shall be permanent engraved 08 Anti vibration mounting Shall be used for mounting MK 6.3 Remote Tap Changer Panel (AVR Panel) 01 AVR supporting arrangement Shall be as per drawing 02 Contacts, components and other pats which

require periodic maintenance Accessibility shall be there for these contacts

03 Bottom terminal boards Shall be above 200mm from cable crutch of incoming multi core cable

Verified By Verified By Verified By

Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

No Check point Criteria Remarks/Date 04 Wiring Shall be neatly arranged in trunking 05 Spare terminals Min 20% spare shall be available 06 Labels Shall be permanent engraved 6.4 General 01 Oily water tank 1) Shall be available at S/S 02 Spillage oil & Fire water 2) Shall be directed to oily water

tank

03 Cobble stone Size shall be 35 to 50mm 04 Level of water in oily water tank Shall be monitored 05 Roof There shall be no gap at roofing

allowing bird entry

06 IDT room Lighting Availability of Essential/ Non Essential/Emergency lightning shall be confirmed.

07 Record room Record shall be kept in lockable exclusive with glass paneled (Attach list of documents available in room)

08 Maintenance access 1) Accessibility shall be there at the top of transformer 2) Safe Movement inside IDT room shall not be obstructed by pipelines.

09 Jacking facility To facilitate safe jacking of IDT, the jacking pads shall be inside the plinth.

Verified By Verified By Verified by

Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

7.0 INSULATION RESISTANCE MEASUREMENT OF TRANSFORMER (WINDING AND CORE & CLAMP)

7.1 INSULATION RESISTANCE - WINDING Measured at 5000 Volts Oil temperature - C

Measured between 15 Seconds (M. Ohms)

60 Seconds (M. Ohms)

600 Seconds

(M. Ohms)

P.I. value (R600/R60)

HV LV and EARTH

LV - HV and EARTH

HV LV

Remarks:- PI value shall be >1.5 7.2 INSULATION RESISTANCE - CORE & CLAMP

Measured at 500 volts Oil Temperature - C Measured between Before 2kv Test (M.ohms)

After 2kv Test (M.ohms) Remarks

Core Earth

Clamps Earth

Core clamps

Note: Confirm that core and clamp are identified and having isolation 8.0 2kV test on Core and clamping structure 1. Applied 2kV, AC, between core & clamps connected together and tank for one minute

Leakage current - mA Result : Withstood / Failed

2. Applied 2kV, AC, between core and core clamps for one minute Leakage current - mA Result : Withstood / Failed

Calibration Details Tested By Witnessed By Witnessed by

Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

9.0 RATIO AND VECTOR GROUP TESTS 9.1 Ratio Check Tap HV applied volts LV measured Volts Measured

ratio Nominal ratio

Error (%)

Remarks U-N V-N W-N u-v v-w w-u

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Voltage continuity check during tap changing operations - OK / Not OK 9.2 Vector group check

Connected terminals 1U& 2u together, Tap changer being on rated tap. Applied 3-phase voltage on HV terminals.

Vector diagram

Measured voltage:

U-V V-v V-w V-W W-w W-v W-U U-N

Remarks:


Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

10.0 MAGNETIZING CURRENT MEASUREMENT 10.1 HV Winding

Tap No. Applied voltage (volt) Measured exciting current (mA) Remarks U phase V phase W phase

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

10.2 LV Winding

Applied voltage (volt)

Measured exciting current (mA) Remarks U phase V phase W phase


Signature

Name



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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

11.0 WINDING RESISTANCE MEASUREMENT 11.1 HV WINDING (Temp C)

Tap No.

Applied current (A)

Measured Resistance (Ohms) Factory value at

75C() Remarks

U N V N W N Average resistance R

@ t C @ 75 C 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Note : Graph plotted ( Tap no on x-axis and R on y-axis) for all the three phases to be attached)

TAP No U V () V - W () W U () Average @ t C ()

11.2 LV WINDING (Temp C) u v / u n

(Ohms) v w / v n

(Ohms) w u / w n

(Ohms) Average (Ohms) Factory value @ 75 C

(Ohms) @ t C @ 75 C


Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

12 SHORT CIRCUIT IMPEDANCE MEASUREMENT

Tap No.

Tap I (A)

Measured voltage on HV (volts)

Measured HV current (Amps)

Impedance (%) at . MVA base

Factory value (%) U V V W W U U V W U V W Average

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Impedance (%) = *Rated current x Measured voltage x 100 (* At corresponding tap) *Rated voltage x Measured current


Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

13.0 MEASUREMENT OF TAN DELTA & CAPACITANCE OF WINDING Ambient temp. Top oil temp.

Sl. No

APPLIED VOLTAGE

(kV)

CAPACITANCE (pF) CURREN

T (mA)

*Dissipation Factor (TAN DELTA) (%) Correction factor k=

Measured combination

Measured Value Factory Value

Difference (%) @

C @ 20C

1

2

3

4

5

6

14.0 MEASUREMENT OF TAN DELTA & CAPACITANCE OF BUSHINGS Make and Type of bushings:

Sl No

Applied voltage

(kV)

Measured on (Sl no. of bushings)

CAPACITANCE (pF) Current

(mA)

*Dissipation Factor (TAN DELTA) (%) Correction factor k=

Measured value

Factory value

Difference % @ C @ 20C

1 HV U

2 HV V

3 HV W

4 HV N

Note:1. Measured values of tan delta and capacitance shall be comparable to factory test report 2.Ensure test tap cap is put back & tight


Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

15.0 CALIBRATION OF TEMPERATURE INDICATORS

15.1 OIL TEMPERATURE INDICATOR

MAKE: TYPE: SERIAL NO.

BATH TEMPERATURE (0C)

INDICATOR READING (0C)

ALARM CONTACT SETTING (0C) OPERATION OF CONTACTS (0C)

TRIP CONTACT SETTING (0C) OPERATION OF CONTACTS (0C)

COOLER START (0C) COOLER STOP (0C)

Remarks: 15.2 WINDING TEMPERATURE INDICATOR (HV)


BATH TEMPERATURE (0C)

INDICATIOR READING ( 0C)




Remarks: - 15.3 WINDING TEMPERATURE INDICATOR (LV)


TEST TEMPERATURE (0C)

INDICATIOR READING (0C)




Remarks: - Note: a). Calibration of indicators shall be done simultaneously and the temperature reading between any two indicators

shall be less than 20C. b) Ensure that the red pointer is appropriately set. Calibration Details


Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

16.0 HOT SPOT GRADIENT CHECK OF WINDING TEMPERATURE INDICATORS

Loc

al /

Rem

ote

Indicator Sl No.

Bath Temp ( C)

Current injected at WT terminal

(A)

WTI reading

(C)

Hot spot gradient (C) Remarks Measured =

(WTI reading bath temp )

Required

Loc

al HV- ONAN-

ONAF- 1.2 pu-

Loc

al LV- ONAN-

ONAF- 1.2 pu-

Rem

ote HV- ONAN-

ONAF- 1.2 pu-

Rem

ote LV- ONAN-

ONAF- 1.2 pu-

Note: Hot Spot Winding Gradient of WTI shall be set based on the maximum gradient obtained during heat run test at ONAN or ONAF rating which ever is higher. Test at other ratings are for reference & subject to review. Current shall be applied after attaining steady temperature reading of the indicator. Sufficient time (approximately 40 minutes) shall be given for taking indicator reading, after current injection.

17.0 RATIO CHECK OF CTs FOR WINDING TEMPERATURE INDICATORS

CT location / Identification

No.

Name plate ratio

*Primary applied current

Measured secondary

current

Measured ratio

* Secondary winding resistance

* Measurement done at CT / MK terminals


Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

18.0 MEASUREMENT OF TRANSDUCER OUTPUT FOR REMOTE TEMP. INDICATOR DETAILS OF DEVICES ROTI : RWTI (HV) : RWTI (LV) : Device connected to SCS/SCC

Bath temp. (C)

OTI WTI (HV) WTI (LV) Reading at Remarks OTI

reading Transducer output (mA)

WTI reading

Transducer output (mA)

WTI reading

Transducer output (mA) SCS SCC

40 50 60 70 80 90 100 110 120 130 140 150

Note: Reading at SCS/SCC shall be done at ambient temperature.


Signature

Name



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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

19.0 ON LOAD TAP CHANGER OPERATION CHECKS Tap changer details Tap Changer Motor Make - Make - Type/Model - Motor Type - Sl. No. - Rating (KW) - MDU Type - Voltage - Year of Mfg. - Rated current -

Sl.No. Description of check Remarks 1 Local operation possible when selector s/w in local position 2 Handle interlock 3 End limit switches in extreme taps 4 Step by step operation 5 Tap position indication in MDU & Divertor switch 6 No of rotations for one step operation 7 Local operation is not possible when selector s/w in Remote position 8 Over travel in operation is within limits 9 Starting current of motor 10 Running current of motor 11 Phase discrepancy in operation (if separate poles for each phases) 12 Time for one tap changing Normal tap 13 Time for one tap changing run through tap (where applicable) 14 Contacts for all alarm/indication circuits 15 Over load tripping of motor (Setting of MPR) 16 IR value of motor and wiring with 500volts Megger 17 Lighting and heater controls (operation of door switch, thermostat etc.) 18 Setting made for voltage monitoring relay (UV/ OV .. ) 19 OLTC counter operation


Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

20.0 TAP POSITION INDICATION CHECK:

Tap Positi

on MDU

Input to Transducer

()

Transducer output for

TPI (mA) at MDU

Transducer (AVR Panel)

Output (mA)

Tap Position at AVR Panel

Tap Position at SCS

Tap Position at SCC

Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19


Signature

Name

Organization Consultant DEWA



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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

21.0 INSULATION RESISTANCE CHECK OF DEVICES

Sl. No. Device/Component

Details of devices Test voltage

Ambient Temp.

Terminal numbers in

MK

IR value (M) Serial No Make

1

HV bushing test tap (U) (V) (W)

2 HV-N bushing test tap

3 Buchholz relay(MT)

4 Buchholz relay(CB) 5 Oil level gauge (MT) 6 Oil level gauge (OLTC) 7 Rubber bag failure relay

8 PRD (MT)

9 PRD (OLTC)

10 PRD (CB U) 11 PRD (CB V) 12 PRD (CB W) 13 OLTC surge relay

14 OTI

12 WTI HV 13 WTI LV

14 Heater HV cable box

15 Heater LV cable box

16 Heater Marsh. Kiosk

17 Heater MDU

18 LV cable box supporting insulators


Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

22.0 FAN MOTOR CHECK

Make Rating KW/HP

Type / Model

Rated current

FAN NO.

SERIAL NO.

CHECK for DIRECTION OF ROTATION

STARTING CURRENT (A)

RUNNING CURRENT (Amps)

U V W

OV

ER L

OA

D D

EVIC

E

OVER LOAD SETTING (Amps)

TRIP OPERATION TIME (Sec)

BLOCKED ROTOR CURRENT (A) (Random test 10% only)

ALARM CONTACT (OK/Not OK)

IR VALUE AT 500 V (M ) 48 HR RUNNING TEST (No abnormality during test)

CHECK FAN RUNNING STARTS WHEN ONE PHASE IS DISCONNECTED RUNNING / NOT RUNNING


Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

23.0 OPERATION CHECK OF COOLING EQUIPMENTS

MANUAL OPERATION

DIRECTION OF FANS / PUMPS

AUTO CONTROL FROM HV W. T. I AS PER DRAWING FAN START (C) FAN STOP. .(C) ACTUAL OPERATION FAN START (C) FAN STOP. .(C)

AUTO CONTROL FROM LV W. T. I AS PER DRAWING FAN START (C) FAN STOP. .(C) ACTUAL OPERATION FAN START (C) FAN STOP. .(C)

AUTO CONTROL FROM O T. I AS PER DRAWING FAN START (C) FAN STOP. .(C) ACTUAL OPERATION FAN START (C) FAN STOP. .(C)

CHECK INTERLOCKING OF COOLING FANS WITH FPS OPERATION

UNDER VOLTAGE RELAY OPERATION AND ALARM CONTACT

MAIN CONTROL MCB TRIP

FAN CONTROL SWITCH TRIP

PUMP / FAN ON INDICATION

PUMP / FAN FAILURE INDICATIONS

CHECK FOR STAGGERED STARTING OF COOLER FANS/PUMPS

WIRING CHECKS (T. B NO, FERRULES, GROUPING OF ALARM CONTACTS ETC. AS PER DRAWINGS)


Signature

Name



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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

24. PROTECTIVE DEVICES WIRING/OPERATION CHECK Sl. No.

Description Initiated from

Terminal No. in MK

Terminal /Ferrule No.in LCC

Remarks/ Results SCS/SCC(To be ensured at the device end)

1 Buchholz Alarm (MT) ------------ 2 Buchholz Alarm(CB) ------------ 3 Oil temp. high ------------ 4 Wind. Temp. high( HV) ------------ 5 Wind. Temp. high (LV) ------------ 6 Rubber bag fail ------------ 7 Oil level high(MT) ------------ 8 Oil level low (MT) ------------ 9 Oil level high (OLTC) ------------ 10 Oil level low (OLTC) ------------ 11 Cooling system faulty 12 Dissolved gas alarm 13 Heating / Lighting

supply failure (MK & CB)

14 Cooling fan running Transformer Trips 1 Buchholz relay (MT) ------------ 2 Buchholz relay (CB) ------------ 3 Surge Relay (OLTC) ------------ 4 Oil temp. high ------------ 5 Wind. Temp. high (HV) ------------ 6 Wind. Temp. high (LV) ------------ 7 PRD (MT) ------------ 8 PRD (OLTC) ------------ 9 PRD (CB U ) ------------ 10 PRD (CB V ) ------------ 11 PRD (CB W ) ------------

Buchholz Relay alarm contact operation check by N2 injection


Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

25.0 CABLE BOX INSPECTION Sl.No Check points Verified by 23.1 HV Cable box prior to HV test of cables U V W

1 Ensure Cleanliness 2 Ensure Earthing of HV and LV terminations 3 Ensure that link is removed &Check test tap cap threads/ tightness 4 Ensure absence of floating parts in cable box 5 Ensure tightness of shield connection 6 Ensure filling of oil 7 Oil test report traceability 8 Ensure the BDV, water content & Tan of filling oil is satisfactory 9 Ensure the BDV, water content of filled oil is satisfactory

10 Ensure body earthing 23.2 HV Cable box after HV test of cables

1 Tightness of shield connection 2 Ensure that link is fitted and connections locked as per cable box

drawing

3 Ensure proper insulation of link as per drawing 4 Ensure cleanliness 5 Ensure that temporary earth link ( provided for HV test) is removed 6 Ensure absence of floating parts 7 Ensure tightness Terminal connections and shield 8 Value of applied torque for the connection of links( as per

manufacturers recommendation ------ Nm Bolt Size ---- mm)

9 Ensure BDV, tan delta & water content of filling oil is satisfactory 10 Ensure the BDV ,water content of filled oil is satisfactory

23.3 LV Cable box (after cable termination) 1 Ensure plating of LV bus bar 2 Ensure terminal connector tightness 3 Measured LV bus bar connection torque (Torque value -- ------Nm

Bolt size ------- mm)

4 Ensure connections are locked after torque checking 5 Ensure that no load is transferred to bushing 6 Ensure min. elect. Clearance as required by drawing. 7 Ensure cable sheath is floating and kept away from earth.


Signature




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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

26.1. CHECK ON AUTOMATIC VOLTAGE REGULATOR (AVR) Details of AVR Make : Sl.No. : Band width % : ( volts) Under voltage

blocking (%) :

Over voltage setting (%) : VT sec. voltage : a). SOFTWARE CONFIGURATION DETAILS Firmware version : Background Program Version : b). HARDWARE CONFIGURATION DETAILS i) AVR System Number (If applicable) : ii)Article No/Sl No of AVR components/cards Sl.no. Description of Components / Cards Art. No. / Sl. No. Remarks c). AVAILABILITY OF BACKUP CDs FOR i) Updated background programme (If applicable) : ii) Firmware : d). AVAILABILITY OF MANUAL FOR ALL HARDWARE COMPONENTS / CARDS : e). AVAILABILITY OF SPARE COMMUNICATION CABLES : (For communication b/w PC and AVR system) f). TYPE OF COMMUNICATION PORT : g). ENGRAVED LABELS PROVIDED FOR ALL INDICATIONS AT AVR :


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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

26.2 Check Points

Sl.No Status description Check point Result Remarks 25.2.1 Operation

1.1

AVR in Auto mode

No manual operation possible from MDU, SCS, SCC and AVR

1.2 Auto operations with the variations in PT sec. Voltage. Tap Raise command when PT sec. Voltage reduced and vice versa

1.3 AVR in manual mode

Auto operations not possible 1.4 Manual operations possible from AVR

Manual operations possible from SCS & SCC 1.5

MDU in local position Operation possible from MDU

1.6 Operation not possible from AVR & SCC/SCS 1.7 MDU & AVR in remote

position Operation not possible from MDU&SCC/ SCS

1.8 Operation possible from AVR 1.9 MDU in remote & AVR in

Supervisory Operations not possible from MDU & AVR

1.10 Operation possible from SCC/ SCS only 1.11 Under voltage blocking No operations possible 1.12 Over voltage setting LED indication 1.13 Selection from SCS/SCC Supervisory/ remote selection of AVR 1.14 Selection from SCS/ SCC Auto / Manual selection of AVR

25.2.2 AVR Display 2.1 Voltage 2.2 Current 2.3 Tap No 2.4 Frequency 2.5 Master/Follower/Independent mode 2.6 Paragramar functions (Breaker status indication)


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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

27. TAP CHANGER & COOLER ALARMS / INDICATIONS CHECK

Sl.No. Alarm description Initiated at AVR DCS SCADA Remarks

27.1. ALARMS

1 TC out of step 2 TC incomplete 3 TC motor supply faulty 4 TC control supply faulty 5 AVR faulty 6 VT supply faulty

27.2. INDICATIONS

1 AVR in Remote 2 AVR in Supervisory 3 AVR in Auto 4 AVR in Manual 5 TC in progress 6 AVR in Independent mode 7 AVR in Master/follower mode 8 TC Extreme tap positions (Raise / Lower) ------- ------- 9 Over Voltage (only at AVR) ----- ------ 10 Under Voltage (only at AVR) ----- ------ 11 AVR healthy Status (only at AVR) ----- ------


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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

28. TAP CHANGER PARALLEL OPERATION CHECKS 28.1 PARALLEL MANUAL MODE

Sl.No.

MASTER/ FOLLOWER/ INDEPENDENT SWITCH SELECTIONS

OLTC OPERATION RESULT / REMARKS

Operated from

MDU AVR TR 1 TR

2 TR

3 TR 1 TR 2 TR 3 AVR panel SCS SCC

1 R H R/S* M F F OPERATE AS MASTER

OPERATE AS FOLLOWER

OPERATE AS FOLLOWER

2 R H R/S* F M F OPERATE AS FOLLOWER

OPERATE AS MASTER

OPERATE AS FOLLOWER

3 R H R/S* F F M OPERATE AS FOLLOWER

OPERATE AS FOLLOWER

OPERATE AS MASTER

4 R H R/S* M F I OPERATE AS MASTER

OPERATE AS FOLLOWER

OPERATE AS INDEPENDENT

5 R H R/S* M I F OPERATE AS MASTER


OPERATE AS FOLLOWER

6 R H R/S* I M F OPERATE AS INDEPENDENT

OPERATE AS MASTER

OPERATE AS FOLLOWER

7 R H R/S* M M M OPERATION SHALL BE NOT POSSIBLE OR OPERATE AS MFF MODE

8 R H R/S* F F F OPERATION SHALL BE NOT POSSIBLE OR OPERATE AS INDEPENDED MODE

9 R H R/S* I I I OPERATE AS INDEPENDENT



10 R H R/S* M I I OPERATE AS INDEPENDENT



11 R H R/S* I M I OPERATE AS INDEPENDENT



12 R H R/S* I I M OPERATE AS INDEPENDENT



M Master F Follower I Independent. S*-- Supervisory for SCS & SCC R Remote A Auto H Hand (manual)


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T P DIVISION TRANSMISSION COMMISSIONING DEPARTMENT SITE TEST REPORT CONTRACT NO: NAME OF SUB STATION: Main Contractor Name of Bay:


DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

28.2 PARALLEL AUTO MODE Check for Breaker status indications before test *AVR (REMOTE Supervisory)

Sl.No SELECTIONS SWITCH GEAR STATUS Mode of AVR (Automatic change over) OPERATES AS

OPERATION CHECKED FROM REMARKS

MDU AVR HV BREAKERS LV INCOMER / BUS SECTION AVR1 AVR2 AVR3 IDT IDT2 IDT3 AVR DCS SCADA IDT1 IDT2 IDT3 IDT1 BS1 IDT2 BS2 IDT3 1 R H R* C C C C C C C C M F F M F F 2 R H R* C C C C C C O C M F I M F I

3 R H R* C C C C C C C O M F I M F I

4 R H R* C C C C C O C C M I F M I F 5 R H R* C C C O C C C C I M F I M F 6 R H R* C C C C O C C C I M F I M F 7 R H R* O C C C C C C C I M F I M F8 R H R* C O C C C C C C M I F M I F9 R H R* C C O C C C C C M F I M F I

10 R H R* O O C C C C C C I I I I I I 11 R H R* C C C O C O C C I I I I I I

12 R H R* C C C C O O C C I I I I I I

13 R H R* C C C C O C O C I I I I I I14 R H R* C C C C C O O C I I I I I I

C.AUTO OPERATION CHECK USING AVR Repeat the above operations in AVR Auto mode (changing AVR selection as Auto instead of H) and by varying the PT secondary voltages. Result/Remarks Remote H Hand (Manual) M Master F Follower I Independent C Close O Open


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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

29.0 OIL LEAK TEST Hourly Reading/ details:

Date Time Ambient Temp. ( C)

Tr. OTI reading

(C) Pressure

at Top (Bar)

Pressure at Transformer Bottom (Bar)

Result /

observation Remarks

----- Before the application of Pressure PRD locking shall be released after completion of pressure test :


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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

30.0 BDV TEST ON INSULATING OIL

Sl.No Test no BDV of Main tank oil BDV of OLTC oil

1 Test no: 1 2 Test no: 2 3 Test no: 3 4 Test no: 4 5 Test no: 5 6 Test no: 6

Average

BDV of Cable box oil Before HV test After HV test

U V W U V W 1 Test no: 1 2 Test no: 2 3 Test no: 3 4 Test no: 4 5 Test no: 5 6 Test no: 6

Average

Sampling done from:

1 Test no: 1 2 Test no: 2 3 Test no: 3 4 Test no: 4 5 Test no: 5 6 Test no: 6

Average

Prepared By Verified by Verified by

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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

31.0 TEST RESULTS / PROPERTIES OF INSULATING OIL BEFORE FILLING

Type of oil : Make: Country of origin: Property Unit Requirement Test Results Remarks

Kinematic viscosity at a) 400C b) -300C

mm2 / S 12 1 800

Flash Point 0C 140 Pour Point 0C - 40 Dissipation factor @ 900C [40 ~ 60Hz] ----------- 0.005 Appearance

------------ Clear free from sediment and

suspended matter

Density at 200C g/ml 0.895 Interfacial tension at 250C mN/m 40 Neutralization Value mg KOH/gm 0.01 Corrosive Sulphur --------- Non corrosive Total Sulphur content % < 0.15

Water Content mg/kg < 30

Antioxidant additives DBPC

%

0.08- 0.4

Oxidation stability a) Total acidity b) Sludge c) Dissipation factor @ 900C d) Total sulphur content

mgKOH/gm

%

%

0.3 0.05 0.050 0.15

Breakdown Voltage (Treated/ delivered) kV 70/ 30 2- Furfural content mg/kg 0.1 PCA content % < 3 PCB content Not detectable DBDS (IEC 62535)

(Copy of Test certificate from oil manufacturer is attached)


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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

32.0 TEST ON TRANSFORMER OIL AFTER COMPLETE SITE PROCESSING Type of oil: Make: Country of origin:

Sl. No. Property Unit Requirement as per Spec.

Test Result

Remarks

1 Color Number 2 (max) 2 Appearance --------- Clean, free

from sediment and suspended matter

3 Breakdown Voltage OLTC

kV 70

Main tank

4 Water Content OLTC

mg/kg < 10

Main tank 5 Dissipation Factor at 900C. --------- 0.015 6 Resistivity at 900C. Gm 60 7 Neutralization Value mgKOH/gm 0.03 8 Interfacial Tension mN/m 35 9 Oxidation Stability (Test

duration 500h) Total acidity Sludge DDF @ 90C Total sulphur content

mgKOH/gm

% --- %

0.3 0.05 0.05 0.15

10 Antioxidant additives DBPC % 0.08- 0.4 11 Flash Point 0C 140 12 Total PCB content mg/kg




DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

33.0 DGA TEST ON TRANSFORMER OIL Date of Sampling : Oil Temperature :

Sampled by : Sampling Point :

Sample identification :

Tests carried out by :

Test report reference :

Test Results

Sl.No. Dissolved gas Concentration (ppm) Remarks

1 Hydrogen (H2)

2 Methane (CH4)

3 Ethane (C2H6)

4 Ethylene (C2H4)

5 Acetylene (C2H2)

6 Carbon Monoxide (CO)

7 Carbon Dioxide (CO2)

8 Oxygen (O2)

9 Nitrogen (N2)

10 TDCG (ppm / %)

11 CO2 / CO


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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

34.0 CHECK ON SMALL WIRING No Check points Requirement Result

1 Alarm/ Trip terminals a) Disconnection b) Identification Alarm Trip c) Termination d) Looping

Facility shall be available Ferrule shall have Alarm or L marking Red ferrule with Trip or T in white shall be provided Stranded wires shall be with crimped terminals. Looping shall be through shorting link

2 CT terminals Shall be with shorting link 3 Plug socket Shall be wired 4 Contact operation check

Door switch of MK Heaters Thermostat (set @.) Hygrostat (set @.)

Performance shall be satisfactory

35.0 CHECK DURING FIRE DELUGE OPERATION

No Check point Requirement 1 Condition of fan Running fan shall trip on deluge operation 2. Entry of water in closed cabinets of

(LV cable box, MK, MDU) & terminal boxes of MOLG, CTs, Fans, PRDs, protective relays & all other device terminal boxes) Ensure that the cabinets are closed and tightened prior to deluge operation)

Shall be watertight.

3 Drainage inside transformer room Drainage system should be satisfactory


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DEWA/TP/132 KV/IDT /1.5.1.1.2.04 Rev.0

36.0 FREQUENCY RESPONSE ANALYSIS (FRA) Test shall be done in the following conditions. A. With neutral earthed (through the test equipment) and LV open

1. Applied on HV U phase 2. Applied on HV V phase 3. Applied on HV W phase

B. With neutral earthed (through the test equipment) and LV short circuited 1. Applied on HV U phase 2. Applied on HV V phase 3. Applied on HV W phase

C. With HV open

1. Applied on LV U phase 2. Applied on LV V phase 3. Applied on LV W phase

(Attach the FRA plots to this sheet)


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Documents

Annexure 4 - Transformer