How do you test the performance of an oil-immersed transformer?

Oil-immersed Transformer is a type of electrical transformer in which the core and windings are immersed in oil. It is the most commonly used transformer type for high voltage power transmission and distribution applications. The oil provides insulation and cooling to the transformer, ensuring efficient performance and longevity. Here is a guide on how to test the performance of an oil-immersed transformer.

What are the signs of a failing transformer?

If you notice any of the following signs, it may indicate that your oil-immersed transformer is failing:

1. Leakage or low oil levels
2. Increased noise level
3. Overheating or burning smell
4. Discolored oil or bushings
5. Increased electrical failures or tripping breakers

How is the insulation resistance tested?

Insulation resistance testing is performed to check the condition of the transformer’s insulation system. By measuring the resistance value, one can determine if the transformer insulation is within acceptable parameters. A Megger insulation tester is used to test the insulation resistance of the transformer. The test is performed between each winding and between the winding and ground.

What is the frequency response analysis test?

Frequency response analysis (FRA) is a non-destructive testing method used to assess the mechanical integrity of the transformer core, windings, and clamping structures. FRA testing is performed by applying a low voltage, low-frequency signal to the transformer and recording the signal response. The recorded response is then analyzed to detect any mechanical damage in the transformer.

Conclusion

In conclusion, oil-immersed transformers are critical components in power transmission and distribution systems. Regular testing of transformer performance is key to ensuring reliability, safety, and longevity of the transformer. Testing procedures such as insulation resistance testing and FRA testing can help detect early signs of mechanical and electrical failure. It is vital to work with a certified electrical engineer for transformer testing and maintenance to ensure proper functioning and compliance with regulations.

DAYA Electric Group Easy Co.,Ltd. is a leading manufacturer of electrical transformers globally. Our oil-immersed transformers are designed and engineered with the latest technology to ensure efficiency, safety, and reliability. To learn more about our products and services, visit our website https://www.cndayaelectric.com. For any inquiries, please contact us at mina@dayaeasy.com.

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