WHAT IS AIR GAP VALUE IN MM FOR A 11KV BUSHING OF 11KV/440V DISTRIBUTION TRANS

WHAT IS AIR GAP VALUE IN MM FOR A 11KV BUSHING OF 11KV/440V
DISTRIBUTION TRANSFORMER. AND AIR GAP VALUE OF 25 KV
BUSHING OF AT TRANSFORMER OF 25 KV TRACTION. WHAT IS THE
CALCULATION FOR THE AIR GAP PERMITTED FOR BUSHINGS AT
DIFFERENT VOLTAGES.

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