(c) In accordance with IEEE 43, clause 9.3, the following formula should be applied: (Rated voltage (v) /1000)+ 1įrom the table below,compare the measurement of resistance value with minimum level of winding resistance, we can determine the winding condition is good or not. (b) For rated voltage above 1000V, measured with a 1000VDC using insulation tester meter. (a) For rated voltage below 1000V, measured with a 500VDC using insulation tester meter. This time i want shared about how to perform insulation resistance testing for common electrical equipment such as motor,transformer and cables.I explain detail step by step how to perform the testing for each equipment.įor electric motor,we used a insulation tester to measure the resistance of motor winding with earthing ( E ). Method of measurement for insulation resistance The insulation resistance testing also can avoid serious damage,fire or electric shock to public and personal.It also can protect and pro long the life span for electrical equipment.We can detect any abnormal condition earlier and rectify quickly and avoid major damage.
This measurement important to determine the winding condition for electric motor,electric cables,electrical installation,transformer,circuit breaker,heater and electrical equipment.įrom the data of insulation resistance,we can make a perfect and clear decision either the electrical equipment in good condition or not.
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