Insulation Resistance Test Transformer

Test results are dependent on the temperature of the insulating material and the humidity of the surrounding environment at the time of the test. This test is carried out to ensure the healthiness of the overall insulation system of an electrical power transformer. Use the megger test at a low voltage side.

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And for this reason its important to follow the safety guidelines at all times when conducting this test.

Insulation resistance test transformer.

1 insulation resistance ir this is the simplest of the tests. Procedure of insulation resistance test of transformer first disconnect all the line and neutral terminals of the transformer. The voltage we apply for measurement of insulation resistance is direct voltage. Because of that insulation resistance can also be referred as 1 minute insulation resistance or 10 minute insulation resistance depending upon the duration of the test.

Insulation resistance test is only more of the major tests that you should perform on a transformer. The one min interval is an industry practice that allows everyone to take the reading at the same time. Insulation resistance test of transformer is essential type test. The standard duration of voltage application are 1 minute or 10 minutes.

Insulation resistance test of transformer is divided into three parts. Ir tests are performed to test the integrity of the winding insulation but at very high voltages. Insulation resistance test values use these values in the absence of consensus standards dealing with insulation resistance tests. After the required connections are made you apply the test voltage for a period of one min.

Insulation resistance testing commonly known as the megger test insulation resistance testing measures the quality of insulation within the transformer. The test measurement values are affected by variables such as temperature humidity test voltage and size of transformer. Testing is typically done with a megohmmeter a tool similar to a multi meter but with a much higher capacity. Record the value of insulation resistance measured by megger tester after applying 1 min.

Adjust megger tester at 1000 v dc. Measure insulation resistance between low voltage windings and the main body of the transformer. This test is performed at or above rated voltage to determine if there are low resistance paths to ground or between winding to winding as a result of winding insulation deterioration.

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