Transformer Winding Temperature
Transformer Winding Temperature
(OP)
Transformer winding temperature indicator (WTI) zero temperature trip. Recently, our transformer WTI made by MSRT Terman tripped swhen the capillary tube leaked and temperature reading dropped to zero. We did not know this feature of the WTI thus we opened it and found that the design would really trip at zero temperature. We proposed that we place some barrier in the meter to prevent the temperature from dropping to zero in case the tube again leaks. Is this OK?






RE: Transformer Winding Temperature
RE: Transformer Winding Temperature
RE: Transformer Winding Temperature
Muthu
www.edison.co.in
RE: Transformer Winding Temperature
RE: Transformer Winding Temperature
If we shall say for full load winding temperature rise will be 90oC then at no-load [1/6 losses of full load] the temperature rise will be 90/6=15 oC. So at -25oC ambient a transformer at no-load winding temperature will be -10oC.
If no other mean will warn us about tube breaks-as Compositepro said-and then the WTI could not signalize an overheating- a minimum -10oC setting on WTI relay will solve the issue, in my opinion.
RE: Transformer Winding Temperature
Using a setting of -10C would interfere with energizing the transformer in colder weather. You may want to consider the case of cold load pickup after an outage.
RE: Transformer Winding Temperature