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The insulation resistance test is the second test required by the electrical safety testing standards.
Insulation resistance test transformer. Megger has the provision to directly read the insulation resistance during insulation resistance test. 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. Insulation resistance is the ratio of the applied voltage dc to the total leakage current. The insulation resistance test consists in measuring the insulation resistance of a device under test while phase and neutral are short circuited together.
Leakage current should be as small as possible therby ir value should be as high as possible r v i. Insulation resistance test between windings. The insulation resistance test of the transformer is one of the most important transformer tests we can perform this test at a factory or site this test can be classified under type test routine test pre commissioning and commissioning tests periodic maintenance transformer tests. Insulation resistance test between windings.
Isolation required for the test. The minimum insulation resistance value accepted in each of the above tests is 2m. Insulation resistance test of transformer. Megger insulation resistance test device.
Time resistance testing method this method is fairly independent of temperature and often. For high voltage transformer high voltage machine or equipment 5 kv range is selected to perform insulation resistance test.
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