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HVDC TRANSFORMER BUSHINGS
Item
Description
7
Gas filling
8
Check PF tap and voltage divider
9
Remove composite insulator plastic foils
10
Top shield installation
PHI 530.1425.2500
IS 2664 GB
PHI 265.850.1500
Page 69 of 70
Kepco project
Activity
Check that the Transport pressure gauge has been removed and properly stored for
future use)
Check the filling gas parameters of the bottles from gas certificates and by quality tests
performed on the single bottle
Connect the gas hose to the bushing DILO type valve.
Start filling operation.
Check for leakage with the gas leak-meter device.
Increase the gas pressure until the Tripping contacts operates (0.52 MPa abs).
Check the remote reading of the gas pressure sensor
Increase the gas pressure until Alarm 2 contact operates (0.55 MPa abs).
Check the remote reading of the gas pressure sensor
Increase the gas pressure until Alarm 1 contact operates (0.58 MPa abs).
Check the remote reading of the gas pressure sensor
Increase the gas pressure at the rated filling value (0.63 MPa).
Wait 4 hours stabilize and record the pressure values.
Perform a gas analyses and a gas Dew Point 48 h after the gas filling operation
Check that the PF tap is firmly closed or that the adapter is installed and wired to the
divider unit.
Remove all plastic protective foils from both composite insulators when the bushing is
installed and the transformer is inside the valve room.
Install the top shield bushing when the transformer is inside the valve room.
Limits / recording
Action on problems
Remove the Transport pressure gauge before
See instruction manual
filling the bushing.
Fill the Gas Check list
Do not fill with gas if gas is not OK.
See instruction manual
Stop at 0.2 MPa abs (1 bar gauge)
Check all bushing flanges and connections
Contact GE Energy Connections RPV.
and also all the gas filling station (if included)
Gas pressure (B3/B4)=______/_____MPa abs
Remote pressure: ________________MPa bs
NO OK:
Gas pressure (B3/B4)=______/_____MPa abs
1) Check the wiring.
2) Reduce the gas pressure and repeat the
Remote pressure: ________________MPa bs
full test sequence.
3) Inform GE Energy Connections RPV
Gas pressure (B3/B4)=______/_____MPa abs
Remote pressure: ________________MPa bs
Pressure recording
At gas monitor B3:
____________ MPa abs
At gas monitor B4:
____________ MPa abs
Remote pressure: ________________MPa bs
Gas data recording (see Table 15)
Filling pressure:
____________ MPa abs
Gas Purity:
____________ %SF6
Contact GE Energy Connections RPV
SO2:
____________ ppm w
Dew point @ Filling pressure:______ ° C
See instruction manual
Do not energize the bushing if the PF tap
cap is missing or if the tap is not connected
to the voltage divider unit
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Date
Signature
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