Method of prolonging the service life of oil immersed transformers

Method of prolonging the service life of oil immersed transformers

There are three main methods to extend the service life of oil immersed transformers: reducing temperature, preventing high working voltage, and avoiding high loads on oil immersed transformers.

Lowering temperature: Oil immersed transformers will experience an increase in temperature after operating for a long time. Usually, the temperature is not easy to rise too high. However, if they are operated excessively for a long time, the temperature will be very high, and many insulation materials will become brittle due to high temperature. Therefore, lowering temperature is a method to prolong the service life of the transformer.

Prevention of high working voltage: It is required that the working voltage of oil-immersed transformers should not exceed the rated voltage. If the working voltage is too high, it will cause the excitation current and current flow of the transformer core to increase. Sometimes, it will promote the saturation of the transformer core, leading to pulse current magnetic flux, and promoting the loss and overheating of the transformer core. Excessive working voltage will accelerate the embrittlement of oil immersed transformers and reduce their service life, so the working voltage should not be too high.

Avoid high loads on oil immersed transformers: The high temperature of oil immersed transformers is generally related to the load flow rate of the load. The more load current, the higher the insulation layer temperature. On the contrary, the smaller load current, the lower the insulation layer temperature. If the oil immersed transformer is operated under load, the temperature will be high over time, which will accelerate the embrittlement of the internal insulation layer, and the service life of the oil immersed transformer will be damaged and accelerated.

The moisture content in transformer oil plays an important role in insulation technical supervision, and is one of the important indicators for testing the qualification of oil products.

The presence of water can affect the electrical performance of oil products, such as dielectric loss factor and breakdown voltage. In addition, the presence of water can also promote oil aging, leading to a decrease in the reliability and service life of electrical equipment.

Testing the water content can monitor the internal insulation status of oil-filled electrical equipment in operation, detect potential faults within the equipment as soon as possible, and make judgments on the nature of the faults to eliminate hidden dangers and ensure safe and reliable operation of the equipment

The measurement of water content in transformer oil shall meet the following requirements:

1. When the voltage level is 110 (66) kV, the water content in the oil should not exceed 20mg/L;

2. When the voltage level is 220kV, the water content in the oil should not exceed 15mg/L;

3. When the voltage level is 330kV-750kV, the water content in the oil should not exceed 10mg/L;

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