Checklist For Shunt Reactor

NATIONAL GRID
Title: Index Number:

CL-NG-6460-002-019
Check List of Oil Immersed Shunt Reactors Commissioning Page Number: Revision No.:
1 of 4 01
1.0 Equipment General Data and Information
Substation
Bay/Panel
Equipment Serial No
2.0 Mechanical check and Visual Inspection
Item Description Done Remarks

Check the impact Recorder for any abnormal impact during
1.
Transportation.
2. Check all components are installed.
3. Frequency responses test.
Check quality of paint, lifting lugs, quality of weld areas rust spots
4.
and wheel stoppers.
Check nameplates information (visible place) as per contract
5. specifications. Name Plate should be weather Proof and in
Visible position.
Check tightness of all bolts (torque wrench method), as per
6. Torque Chart which will be normally available near the name
plate.
Check that all groundings are securely connected.
7.
(at least two grounding points to main tank are available)
A two-stage Buchholz relay shall be provided for the tank and
located in the pipe (with a slope of pipe not less than 1 in 12)
8. from the reactor tank leading to the conservator. Confirm that the
relay is in service position, after completing the Test-If Buchholz
Relay is available.
Check the valves between the tank and radiator are in open
9.
position with indication marked as Open.
Check the bushing minimum creepage and insulation
10.
requirements shall be as specified in 01-TMSS-01.
Check all pipes – hoses and fan protection (not rubber or
11.
plastic).
12. Perform all of the manufacturer specific checks.
13. Check labeling of all auxiliary devices as per approved drawing.
Check oil level indicator has a diameter of the dial is about
210mm. The dial markings show 25ºC level as well as the high
14.
and low oil levels. Check the indicator is provided with low and
high level alarm and trip contacts.
Archiving System Website: http://AMAS
NATIONAL GRID

CL-NG-6460-002-019
Checklist for Commissioning of Oil-Immersed Power Transformer Page Number: Revision No.:
2 of 4 01
15. Check all external wiring for correctness and tightness.

Check that the temperature sensors oil well is two thirds filled
16.
with oil.
a. Check Winding Temperature Indicator has a dial type
indicator with a maximum indicating pointer. The dial marking
shall be 20 to 160°C with ±0.5% accuracy.
b. Four (4) individually adjustable sets of contacts shall be
17. available for the control of fans, alarm and trip functions. The
contacts for the control of fans and pumps shall be wired to
available terminal points for future use.
c. The sensing element shall be supplied by CTs installed on
the central phase of the winding.
Check Leak testing with pressure (tightness test):- A pressure of
at least 35 kPa over the normal oil pressure shall be applied and
maintained for 24 h. Oil leakage shall not be observed during this
18.
period. Operating pressure (kPa) due to oil preservation system
shall be stated in the test report. The permanent deflection after
releasing pressure shall not exceed 0.3%.
19. Check oil level in main tank and conservator.
Tank and accessories shall be designed without pockets where
20. in gas may not collect. Where pockets cannot be avoided pipes
shall be provided to vent the gas into main expansion pipe
Check Drain/filter valve and lower sampling valve was provided
21. at a minimum height of one meter from the ground level, for easy
access.
22. Check all external wiring for correctness and tightness.
Check Oil Temperature Indicator with The dial marking shall
23. cover a range of 20 to 160ºC with ±0.5% accuracy.
Check it is fitted with two sets of alarm/trip contacts.
3.0 Electrical Test

NATIONAL GRID

CL-NG-6460-002-019
3 of 4 01
Item Description Done Remarks

1. Core Insulation Resistance at 1 kV DC.
Winding Insulation Resistance and Polarization Index test at 5
2. kV DC. The Insulation Resistance value between bushing to
Ground shall be in Gega Ω and Polarization Index (>1.5)
Winding Resistance (DC) test (winding temperature shall be
recorded; winding resistance shall be referred to 75°C). The
3. measured winding DC resistance should be kept as future
reference value for comparing the DC resistance whenever
over hauling of Reactor is taken.
4. Measurement of Reactance.
Measurement of dissipation factor (tan δ) of the insulation
5.
system capacitances.
a. Winding temperature indicator to be calibrated by heating the
sensor in oil bath and check against standard thermometer.
6. Also check by current injection, Check pick up/ Drop off of
contacts:
b. Proper setting as per drawing to be applied and tested.
Oil temperature indicator to be calibrated by heating the sensor
7. in oil bath and check against standard thermometer. Setting as
per drawing to be applied and tested.
Fan motors current (starting, running, one phase removal and
8. locked rotor) shall be measured and checked against rating.
Check if wiring size suitable to carry the current.
Check fan running direction to get air flow towards radiator and
9. Phase sequence of supply voltage to fan motors circuits is
correct.
MCBs in marshalling kiosk to be checked by current injection
10.
each pole for alarm and trip.
Bushing Current Transformer Testing
a. Polarity test
b. Insulation Resistant test
c. Secondary Winding Resistant (All windings and all taps).
d. Current Ratio test
11. e. Magnetization Characteristics (Minimum 5 points below and
2 points above the knee point.
f. Verify secondary circuits, Terminals to Terminal.
g. Burden Test.
h. Demagnetize CT cores after all tests.
i. Ensure that No open circuit at Secondary side.
j. Ensure that the CTs are identical in all phases.
Functional Check of the following :-
a. Liquid Level indicator (alarm/ trip) as applicable.
NATIONAL GRID

CL-NG-6460-002-019
4 of 4 01

Checklist For Shunt Reactor

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NATIONAL GRID

Title: Index Number:

1.0 Equipment General Data and Information

Item Description Done Remarks

Title: Index Number:

15. Check all external wiring for correctness and tightness.

3.0 Electrical Test

Archiving System Website: http://AMAS

Title: Index Number:

Item Description Done Remarks

Title: Index Number:

Archiving System Website: http://AMAS

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