Insulation Resistance Test Transformer

Megger insulation resistance test device.

Insulation resistance test transformer.

Time resistance testing method this method is fairly independent of temperature and often. Insulation resistance test between windings. All insulators are supposed to be pure capacitor having very few capacitance so as to take minimum charging current. The insulation resistance test is the second test required by the electrical safety testing standards.

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 of transformer. Leakage current should be as small as possible therby ir value should be as high as possible r v i. For high voltage transformer high voltage machine or equipment 5 kv range is selected to perform insulation resistance test.

The minimum insulation resistance value accepted in each of the above tests is 2m. Megger has the provision to directly read the insulation resistance during insulation resistance test. Isolation required for the test. Insulation resistance is the ratio of the applied voltage dc to the total leakage current.

Double insulated symbol. A 500v insulation resistance test is suitable for 110 400 volt transformers.