Insulation Resistance Transformer Megger Test Diagram

The megger insulation tester is essentially a high range resistance meter ohmmeter with a built in direct current generator.

Insulation resistance transformer megger test diagram. Record the value of insulation resistance measured by megger tester after applying 1 min. Importance of insulation resistance test or megger test. Use the megger test at a low voltage side. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.

For good insulation the resistance usually reads in the megohm range. Hands down without a doubt one of the most universally searched topics on ec m s website from a historical perspective is insulation resistance testing as a result some of our most popular evergreen articles like understanding insulation resistance testing continue to top the charts when it comes to most popular content. Measure insulation resistance between low voltage windings and the main body of the transformer. 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.

A failing transformer is a costly replacement in an electrical system with the potential for a long downtime. Transformer insulation resistance deterioration is one of the most common causes of transformer failure. It also serves as the best guide to indicate the health of the equipment. If you fail to maintain your transformer with regular insulation resistance testing as can be carried out by the megger.

Which help to find the short circuit problems in the circuit. Value at 60 seconds after application of the test voltage is referred to as the insulation resistance of the transformer at the test temperature. Adjust megger tester at 1000 v dc. Since 80 of electrical maintenance and testing.

The transformer neutral bushing is to be disconnected from earth during the test. Megger makes electrical test equipment to help you install improve efficiency and extend the life of electrical assets and cable networks at high medium and low voltage. An insulation test is carried out to test the integrity of the insulation between conductors. Apply the test voltage and note the reading.

Insulation resistance test of transformer is divided into three parts.