Q:

What is Megger testing?

A:

Quick Answer

Megger testing works to ensure that electrical insulation is in good operating condition. This type of testing requires an insulation tester.

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What is Megger testing?
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Full Answer

Megger testing does not cause any damage, making it a good option when someone does not want to put holes in walls to test electrical insulation for any problems or issues. The testing device only goes between 500 and 1,000 volts, which is relatively low. Due to the low voltage, some punctures in insulation go undetected. It generally provides information about the leakage current and whether insulation areas have excessive dirt or moisture as well as the amount of moisture, deterioration and winding faults.

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    How is a Megger tester used?

    A:

    An insulation resistance tester (commonly called a Megger after a prominent company that manufactures them) is operated by hooking it up to a piece of electrical equipment and running voltage across the insulation on the equipment. The Megger calculates how well the electrical insulation on the equipment is working by checking how much current is flowing between the Megger to the machine. The higher the resistance, the less current will flow, amounting to better electrical insulation shielding. This is important, because poor insulation leads to equipment breaking down.

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    What happens during a Megger Test?

    A:

    During the Megger test, an insulation resistance meter applies a direct current voltage of 500 or 1,000 volts to electrical insulation and records data at one minute, 10 minute and intermediate intervals to determine if the insulation is adequate for continued service. Megger test results show the relative amount of moisture in the electrical insulation, current leakage where the insulation is dirty or moist and any faults or deterioration in winding. Moisture decreases insulation resistance; low resistance indicates poor insulation.

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