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I assume that you are asking what is the separation of a horn gap? Horn gaps are determined by voltage levels, not by power levels, so your question cannot be answered.

On the other hand, if you are asking what they are for, then its to divert travelling voltage waves (due, for example, to lightning strikes) to earth before they can damage the transformer.

Incidentally, if you mean 'megavolt amperes', rather than 'millivolt amperes', then your question should read '315 MV.A', not '315 mva'!

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