Insulation Resistance Test Using Megger Of Transformer

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Insulation resistance test using megger of transformer.

Use the megger test at a low voltage side. Measure insulation resistance between low voltage windings and the main body of the transformer. A failing transformer is a costly replacement in an electrical system with the potential for a long downtime. Value at 60 seconds after application of the test voltage is referred to as the insulation resistance of the transformer at the test temperature.

The easy to use software interface powerdb minimizes time required to learn how to use the delta4000 and perform these tests correctly. The megger insulation tester is essentially a high range resistance meter ohmmeter with a built in direct current generator. Adjust megger tester at 1000 v dc. Megger test equipment help to measure transformer insulation resistance winding resistance sweep frequency response analysis and oltc diagnosis tests enable the assessment and overall health of the transformer to be determined.

For good insulation the resistance usually reads in the megohm range. This guide explains the many types of transformer and the power factor test procedures for each one. Apply the test voltage and note the reading. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.

Megger insulation resistance test device. The insulation resistance test is of value for future comparison and also for determining if the transformer is to be subjected to the applied voltage test the winding insulation resistance test is a dc high voltage test used to determine the dryness of winding insulation system the test measures the insulation resistance from individual windings to. Transformer insulation resistance deterioration is one of the most common causes of transformer failure. Insulation resistance test of transformer is divided into three parts.

As can be carried out by the megger transformer ohmmeter mto series of transformer test equipment then it s likely to. Power factor testing of power and distribution transformers the transformer is probably one of the most useful electrical devices ever invented. Record the value of insulation resistance measured by megger tester after applying 1 min.