HVAC: Megger Insulation Resistance Test For 3 Phase Motor(Windings Insulation Resistance)Supco M500

HVAC(Heating, Ventilation, Air Conditioning) Megger Insulation Resistance Test For 3 Phase Motor(Windings Insulation Resistance)Supco M500 Megohmmeter Check/How To Check A 3 Phase Induction Motor With A Megohmmeter/How To Ohm Out A 3 Phase Motor/How To Use The Supco M500 To Check A Motor/Evaporator Fan Motor/Condenser Fan Motor
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Supco M500 Insulation Tester/Electronic Megohmmeter
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Today we will be performing an insulation test (Meg a Motor/Megging a Motor/Megger a Motor) for a 3 phase induction motor using the Supco M500 megohmmeter. We are looking for 100 megohms and greater according to this meter as well as a general rule of thumb to diagnose the motor as good. We are checking the insulation surrounding the motor windings.
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WHAT IS A MEGOHMMETER & HOW DOES IT WORK?
A Megohmmeter or insulation resistance tester is a special type of ohmmeter used to measure the electrical resistance of insulators. Insulating components, for example cable jackets, must be tested for their insulation strength at the time of commissioning and as part of maintenance of high voltage electrical equipment and installations.
For this purpose, megohmmeters, which can provide high DC voltages (typically in ranges from 500 V to 5 kV, some are up to 15 kV) at specified current capacity, are used. Acceptable insulator resistance values are typically 1 to 10 megohms, depending on the standards referenced.
A megohmmeter, or megger as it is more commonly known, is an electrical test instrument designed to test extremely high resistances by producing a DC (direct current) voltage of between 300 and 15,000 volts. A megohmmeter produces a high voltage, low current DC charge which allows for testing resistances commonly encountered in electric motor winding or cable insulation tests. Megohmmeters produce this high voltage via battery powered internal circuitry or a manually operated generator.
Testing electrical equipment, machinery, or installations for winding, ground, or insulation resistance with a regular ohmmeter may not be accurately achieved due to the extremely high resistances common in these applications. Resistances in these cases may range from several megohms to several million megohms and require a test voltage far higher than that utilized by smaller ohmmeters. A megohmmeter uses DC voltages ranging from 300 to 15,000 volts to accurately measure these very high resistance values. These voltages are supplied at very low current ratings and are typically not dangerous to the megohmmeter user.
There are two basic types of megohmmeter: a battery operated variety and one that makes use of a hand crank or motor operated generator. Both megohmmeter variants are capable of conducting accurate insulation resistance testing on installations and equipment with resistances of several teraohms (1,000,000 megohms). Battery operated megohmmeters employ specialized internal circuitry to convert the low battery voltage to the higher test voltage. These instruments are typically smaller and lighter than the generator versions and offer the benefits of single button, one-handed operation and the choice of multiple operational voltages. The downside of battery operated megohmmeters include short battery life and that they generally produce only a maximum of 5,000 volts.
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The Supco M500 Insulation Tester/Electronic Megohmmeter is an alternative to taut band megohmmeters. It gives you accurate and fast measurements to verify the condition of insulation. As it comes with a soft carrying case, The Supco M500 Insulation Tester/Electronic Megohmmeter can be used in applications such as testing motor winding insulation and diagnosing heat damaged and deteriorating insulation in hermetic refrigeration compressors, appliances, panel boards, relay control circuits, motors and more. Measure insulation values up to 1000 megohms @ 500VAC.