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Transformer inrush and Generators

Transformer inrush and Generators

Transformer inrush and Generators

(OP)
Hello Everyone,
What will be the limit of a transformer capacity one can safely switch on to a generator?In many of the schemes prevailing in industries,it is not possible to start the generator with transformer circuit breaker closed like a single unit.And the transformer switching on generator is going on, day in day out, without giving any thought or concern!So what is the cut off limit?
This scenario is especially true and prevalent in the case of HV generators,where the auxiliary transformers(11/0.433kV) are switched on to generators.Not only in industries but also during islanding operation of power plants.
Can we assume that as long as,the fault level of the generator capability,i.e., the asymmetrical fault current exceeds the through fault current of the transformer(asym.),
it is safe to switch on the transformer on to a generator?
Of course,the transformer inrush and fault current are different phenomenon.
Thanks

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