Insulation Resistance Test Transformer

Time resistance testing method this method is fairly independent of temperature and often.

Insulation resistance test transformer.

All insulators are supposed to be pure capacitor having very few capacitance so as to take minimum charging current. For high voltage transformer high voltage machine or equipment 5 kv range is selected to perform insulation resistance test. Isolation required for the test. Megger has the provision to directly read the insulation resistance during insulation resistance test.

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. Double insulated symbol. Insulation resistance test of transformer.

Insulation resistance test between windings. A 500v insulation resistance test is suitable for 110 400 volt transformers. The minimum insulation resistance value accepted in each of the above tests is 2m. 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.

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.