44
Procedure Time Check Method
Oil leakage
When
necessary
• The oil leaked out within 2 hours can be re-used
directly.
• For the oil that has leaked out for over 2 hours, you
may test it for voltage withstand, water content, and
dielectric loss based on the actual situation.
You may refer to the requirements specified in the
IEEEStdC57.147-2018.
1 Oil breakdown voltage is not lower than 45kV.
2 The water content of the oil does not exceed
≤300ppm.
3 Oil dielectric loss does not exceed ≤0.5（25℃）.
Loads voltages
and currents
Every three
weeks
Register each phase operation values.
Oil temperature
gauge
Every three
weeks
Register oil temperatures.
Yearly
• Verify gauge temperature calibration.
• Verify and clean the gauge.
Tank and
radiators
Every three
weeks
• Revise noises or strange vibrations.
• Revise oil leakages (radiators, inspection registers,
instruments, valves, etc.).
Yearly
• Clean the heat dissipation surface (adjust the
frequency of this activity according to the
atmosphere conditions peculiar of the installation
place).
• Apply painting where be necessary.
• Tightly screwing all vibration parts according to "7.5
6.5 Recommended Torque".
• Check radiators valves operation.
Valve and
stopper
Every three
weeks
• Inspect all the valves, stopper and oil pipeline.
• If leakages exist, it is important to program an out of
service maintenance.
• Revise draining valves that can be operated without
keys to prevent miss-operation.
9 Transformer Maintenance Guide User Manual
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