Answer / subaharan

first check the transformer bushings and their condition,then
you meggering the transformer each phase to phase and phase to
earth.
power cable you check the high voltage test which is used for
measuring the leakage current,meggering and continuity
checking.
switchgear the same meggering,isolator checking,relay
testing(set various values of currents,voltages and set time
for tripping) make the fault and note the trip time.

If we use 250A MCCB as a incomer in Control panel for a fault level of 50kA for one second ,assuming temperature rise from 85 Deg. to 100 Deg , Then what will be the Aluminium Bus-bar size for 250A MCCB? Explain in detail.

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