Transformer Insulation Resistance Test Values

Value at 60 seconds after application of the test voltage is referred to as the insulation resistance of the transformer at the test temperature. Clean the terminals of the transformer. A winding resistance test of a transformer is carried out as a type test routine test and also as a field test.

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Before conducting a transformer winding resistance test it is important to observe all safety warnings and take proper precautions ensure that all equipment to be tested is properly grounded and treat all high voltage power equipment as energized until proven otherwise by using the proper lockout tagout procedures.

Transformer insulation resistance test values.

Measure insulation resistance between low voltage windings and the main body of the transformer. Apply the test voltage and note the reading. Use the megger test at a low voltage side. Apply the test voltage and note the reading.

After the required connections are made you apply the test voltage for a period of one min. In the factory it helps in determining the following. B kv is the rated machine terminal to terminal voltage. 1 insulation resistance ir this is the simplest of the tests.

Adjust megger tester at 1000 v dc. Visual and mechanical inspection 2. Ansi neta mts 2015 table 100 11 insulation resistance test values rotating machinery for one minute at 40 c. Values based on ieee std 43 2013.

Calculation of the i 2 r losses in transformer. That this document list how to test specific pieces of equipment or systems. Calculation of winding temperature at the end of temperature rise test of transformer. Steps of this test.

With a little record keeping and common sense however you can get a good picture of the insulation condition from values that are only relative. Insulation resistance decreases in temperature or moisture. The transformer neutral bushing is to be disconnected from earth during the test. Use caution when testing.

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. Value at 60 seconds after application of the test voltage is referred to as the insulation resistance of the transformer at the test temperature. A rated line to line voltage for three phase ac machines line to ground voltage for single phase machines and rated direct voltage for dc machines or field windings. Expected test results section 7 consists of sections specific to each particular type of equipment.

Within those sections there are typically three main bodies of information. The transformer neutral bushing is to be disconnected from earth during the test. Basically there are three different tests that can be done using a megohmmeter. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.

Insulation resistance test of transformer is divided into three parts. Megger insulation resistance test device.