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Use a standard multimeter to test inter-phase resistance on all three phases.ġ.

Incorrect use of megger can cause damage to the parts of the equipment and injuries to users. To make these measurements, it will be necessary to perform the following:ĭisconnect the motor from the power supply and connect a megger between the windings.Įstablish a safe working zone to keep away unauthorized personnel from the megger as it will be supplying a high voltage.

One thing to be taken care that, there has to be a clear path between the insulation system and the machine cover. There are very clear limitations on the ability of insulation resistance testing, alone, to assess the condition of an electric motor for operation. Measuring the resistance of motor windings makes it possible to detect deterioration due to weather, corrosion, dirt, moisture, and excess vibration before the motor fails. The purpose of measurement of insulation resistance The megohmmeter or megger is a measuring tool that analyzes high electrical resistances. The name of this instrument, meggers, derives from the measurement of the insulation of cables, transformers, insulators, etc. Insulation meters or meggers are instruments used for the measurement of electrical insulation in high voltage.