Question: What are the tests you carry out for transformer oil during preventive maintenance?

What tests are performed for testing the transformer oil?

Screen Testing

The “screen test” is a collection of physical, electrical and chemical tests for the transformer oil. These tests include dielectric breakdown, power factor, interfacial tension, acidity, and color. A larger quantity of oil is needed for these tests.

What are the maintenance checks required by a transformer?

Here are 3 maintenance tests you should run on your transformer on a daily basis:

  • Oil levels of MOG( Magnetic Oil Gauge) of the main tank and conservator tank. Always maintain to keep oil filled up to the desired level in MOG.
  • Replace the silica gel if its color changes to pink.
  • If any leakage is detected seal it.

Why do we test transformer oil?

Transformer oil, a type of insulating and cooling oil used in transformers and other electrical equipment, needs to be tested periodically to ensure that it is still fit for purpose. This is because it tends to deteriorate over time.

What is ppm test of transformer oil?

PPM stands for Parts Per Million. It is used to measure the weight of moisture divided by the value of oil. The moisture content in oil lowers the insulating system dielectric strength that permits flashover to harm a transformer. For example, for mineral oil, a generally accepted maximum moisture content is 35 ppm.

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What is the need for transformer testing?

The need for transformer testing is to check the functioning of the transformer and to decrease the chance of failure. All electrical equipment needs to be maintained safely from some of the failures. Transformer failure can happen because of electrical, thermal, or mechanical factors.

How do you test a transformer?

To test your transformer, simply touch the red and black pins of your ohmmeter to the opposite ends of the transformer’s wiring. Read the display and compare the resistance on your ohmmeter to the resistance stated on the transformer’s data sheet. This is sometimes listed on the transformer’s enclosure.

How often should transformer oil be tested?

Routine testing of transformer oils and insulating oils on a regular schedule is an accepted industry practice. General and physical tests are suggested twice a year, dissolved gas analysis once a year, and Furan testing every 2 years for transformers in operation at least 5 years.

What are the steps and procedures for preventive maintenance of transformer?

Transformer preventative maintenance involves routine inspection, adjustment, testing, minor fixes, and special handling instructions. Also, the trouble- free service of the equipment over its life depends on proper installation, operation, and maintenance. This philosophy is based on reactionary operation mode.

Which steps are required if oil level in transformer is low during preventive maintenance?

In case of unsatisfactory oil level in the MOG, oil to be filled in transformer and also the transformer tank to be checked for oil leakage. If oil leakage is found take required action to plug the leakage. If silica gel becomes pinkish, it should be replaced.

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Which of the following is not a routine test for Transformers?

1. Which of the following is not a routine test for transformers? Explanation: Impedance test is done on a transformer in order to check net impedance offered by a transformer circuit at rated supply. Polarity test is also done before SC and OC test on transformer.