We need one generator transformer (11/7.2 KV ,Dyn11 ) .The star side will be connected to ungrounded system and hence neutral will be isolated.However the delivery of the transformer is bit delayed .We are having a spare transformer of same rating , the only difference being that the spare transformer was in use in a grounded system with its neutral grounded .
The standard says that the insulation level of the transformer depends on whether the neutral terminal is intended to be directly earthed or not.Therefore we are in a dilemma whether to use the spare transformer or not.
Please help !!
The standard says that the insulation level of the transformer depends on whether the neutral terminal is intended to be directly earthed or not.Therefore we are in a dilemma whether to use the spare transformer or not.
Please help !!