Insulation Resistance Test Procedure: Isolate the equipment, - TopicsExpress

Insulation Resistance Test Procedure: Isolate the equipment, apply working grounds to all incoming and outgoing cables and disconnect all incoming and outgoing cables from the transformer bushing terminals connections. Disconnected cables should have sufficient clearance from the switchgear terminals greater that the phase spacing distance. Use nylon rope to hold cable away from incoming and outgoing terminals as required. Ensure the transformer tank and core is grounded. Disconnect all lightning arresters, fan system, meter or low voltage control systems that are connected to the transformer winding. Short circuit all winding terminals of the same voltage level together. Perform a 1 minute resistance measurements between each winding group to the other windings and ground. Remove all shorting leads after completion of all test. electrical-engineering-portal/meggering-insulation-resistance-testing-power-transformer?utm_source=Technical+Articles&utm_campaign=58cb20295c-RSS_EMAIL_CAMPAIGN&utm_medium=email&utm_term=0_ae069f0d91-58cb20295c-320665429

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