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Required Precautions1KV = 1 MΩ /1KVAs per IE Rules-1956At a pressure of 1000 V applied between each live conductor and earth for a period of one minute the insulation resistance of HV installations shall be at least 1 Mega ohm or as specified by the Bureau of Indian Standards.
Treat it as part of the grounded section of the circuit.
Resistance measurements are then made between each winding and all other windings grounded.
Short circuit each winding of the transformer at the bushing terminals.
Capacitors and indicator or pilot lamps must be disconnected or an inaccurate test reading will result. He is member of Institution of Engineers (MIE), India. He has more than 13 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution).
Where any equipment is disconnected for testing purposes, it must be subjected to its own insulation test, using a voltage which is not likely to result in damage. He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad, India.
The wiring and cables need to test for each other ( phase to phase ) with a ground ( E ) cable.The resistance between Phase-Phase-Neutral-Earth must never be less than 0.5 M Ohms for the usual supply voltages.In addition to the leakage current due to insulation resistance, there is a further current leakage in the reactance of the insulation, because it acts as the dielectric of a capacitor.The Insulated Power Cable Engineers Association (IPCEA) provides the formula to determine minimum insulation resistance values.R = IR Value in MΩs per 1000 feet (305 meters) of cable.