Testing Of Power-Transformer
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Transformers have to be tested to check their functioning and to maintain their working capacity and lower the chances of failure if any. Below listed are the types of testing of transformers:
- Resistance test
- Insulation resistance test
3. Power factor test4. Turns ratio test
1. What is a Resistance test?
- The resistance test of a transformer is conducted using an ohmmeter.
- Leave the transformer to settle at the same temperature as the atmosphere surrounding it.
- With this test, one can check for any differences in the openings and the windings of the transformers
- After this test, one can confirm that all the open transformers are correctly wired and connected correctly.
2. What is an insulation test/ Megger test?
- Also known as the Megger test
- The insulation test of a transformer is conducted using a megohmmeter.
- It is used to determine the quality of the insulation
- If the insulation works appropriately, it will show greater resistance
- Note that if it shows any lower resistance, then it is a sign of an issue.
3. What is a Power Factor test?
- The power factor test of a transformer in which the power loss can be identified by measuring the angle.
- For an accurate result, the angle of the currents should ideally be 90 degrees.
- By this test, you can determine any decrease or any malfunction of the insulation.
- This test can be completed with a power factor test kit.
4. What is a Turns Ratio test?
- This is an AC low voltage test to determine the ratio of high voltage winding.
- The Turns Ratio test of a transformer is conducted using a Transformer Turns Ratio tester.
- Through this test, one will know about the transformer, whether it will provide a step up or a step-down voltage.
- This test is conducted on all taps of every winding of the transformer.