Answer Posted / srikanth_kalishetti@yahoo

1. PRV Trip :- The transformer inside when abnormal
pressure is build up the PRV Trip occurs.

2. OLTC :- It is the on-load tap changer. Through which tap-
changing of the transformer is done to lower or raise the
taps of the transformer.

3.OTI :- Oil temperature Indicator. It indicates the oil
temperature of the transformer.It gives alarm & later trips
the transformer when the set temperature is reached.

4. WTI:- Winding temperature Indicator. It indicates the
winding temperature of the transformer.It gives alarm &
later trips the transformer when the set temperature is
reached.

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