Insulation Resistance Test Procedure Megger

Energize the megger for 1 minute.

Insulation resistance test procedure megger. The test measures the insu lation resistance between the phases and or between phase and ground. For cables above and less than 1200 volt use 2500 volt megger. The megger test is a method of testing making use of an insulation tester resistance meter that will help to verify the condition of electrical insulation. For good insulation the resistance usually reads in the megohm range.

Types of insulation resistance tests short time or spot reading test. Insulation resistance quality of an electrical system degrades with time environment condition i e. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. This meter is of special.

The insulation resistance test a k a the megger test is as relevant as ever and in many applications is preferred to other insulation test methods. In particular our line of s1 series insulation testers offers unparalleled capability including battery or line operation best measurement ranges highest noise resistance five automatic tests data storage rs232 or. Insulation resistance testing is a non destructive test procedure. Insulation resistance testing purpose.

Temperature humidity moisture and dust particles. If you are testing insulation resistance to ground place the positive probe on the ground wire or the grounded metal junction box and the negative probe on the conductor or terminal. This meter is of special construction with both current and voltage coils enabling true ohms to be read directly independent of the actual voltage applied. It s also known as an insulation tester.

Continue with this testing procedure until you have values for all the spaces of your table. Read the value of the resistance at the end of the minute test and note it in your table. To test a cable with a megger you connect one probe to the outside of the cable and with the power turned off you touch the probe to the conducting wire at the point of connection. Today megger offers the finest line of 5 kv 10 kv and 15 kv dc insulation resistance testers available anywhere.

A megger is an ohmmeter that measures resistance in the megohm scale. For cables 300 volt use 500 vdc megger. In conclusion a multimeter measures the electrical resistance of a conductor coil while a megger measures the insulation resistance of an isolated group two coils relative to mass something that a multimeter is unable to do. The megger insulation tester is essentially a high range resistance meter ohmmeter with a built in direct current generator.

For cables above 300 volt to 600 volt use 1000 volt megger. The megger insulation tester is essentially a high range resistance meter ohmmeter with a built in direct current generator. Procedure for continuity and insulation resistance testing. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.

Perform megger test on each cable with respect to ground and adjacent cables.