Answer Posted / parmod kuma

In annual maintenance we check the following points in oil
type transformer

1. We check the die-electric strenth of the oil.
2. We check moisture of the oil.
3. we check Be=reak down voltage of the oil.
4. We check the earthing of the transformer
5. We check Silica gel .
6. We calliberate all the relay like over corrent, earth
fault & differntial relay.

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Maintenance of transformer???

2199

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is oil viscosity affect on motor current?

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Please help me regarding my one concern. - During earth pit testing we noticed that the Clean earth pit and dirty earth pit showing continuity (Resistance value - 5ohm) . I want to know that if both earth pit have separate location and there is not internal looping between PIT then why such continuity is showing on it . Because of this issue the field side all earthing point showing short. In PLC panel we are providing two types of earthing cable which is coming from separate earth pit (Clean and Dirty earth pit) because of earth PIT showing short our PLC is not complying spec . please help regarding this issues.

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