Insulation Resistance Test Procedure Of Current Transformer
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Adjust megger tester at 1000 v dc.
Insulation resistance test procedure of current transformer. Leakage current should be as small as possible therby ir value should be as high as possible r v i. 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. Clean the terminals of the transformer. This test can be repeated during the service life of the transformer and verified against the result obtained during manufacturing as a check to determine if the insulation is malfunctioning or decaying.
Transformer winding resistance measurement is carried out to calculate the i 2 r losses and to calculate winding temperature at the end of a temperature rise test. Megger insulation resistance test device. Steps of this test. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.
Use caution when testing. It is carried out as a type test as well as routine test. Insulation resistance is the ratio of the applied voltage dc to the total leakage current. Isolation required for the test.
Mechanical check and visual inspection. Insulation resistance decreases in temperature or moisture. Variac step up transformer 0 2kv primary current injection set. 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.
The test is performed with a power factor test kit and the connections are the same as for the megger test the insulation resistance test. Required equipment for testing. It is also done at site to ensure healthiness of a transformer that is to check loose connections broken strands of conductor high contact resistance in tap changers high. Use the megger test at a low voltage side.
Insulation resistance test of transformer is divided into three parts. Verify nameplate ratings are in accordance with the approved drawings and.
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