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What is the cause of partial discharge in transformer?

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Release time: December 11, 2019 Source: Huaxing Xiaoxu Number of hits:

There is a special phenomenon in transformer, namely partial discharge. It is mainly the discharge of transformer, transformer and other high voltage electrical equipment under the action of high voltage. This kind of discharge only exists in the partial position of the insulation and will not form the whole insulation through breakdown or flashover immediately, so it is called partial discharge. Partial discharge (PD) is very weak, which can not be detected by human intuition, such as eyes, ears and ears.

The internal insulation of transformer is under the action of working voltage for a long time in operation, especially with the improvement of voltage level, the electric field strength value of insulation is very high, and partial discharge is easy to occur in weak insulation area. According to the knowledge of the small edition, the causes of partial discharge are as follows: the electric field is too concentrated at a certain point, or the electric field strength at a certain point is too large, such as bubbles and impurities in solid medium There is serious electric field distortion at the interface in different medium combinations. The traces of partial discharge often leave only a small spot or a branch burning mark on the solid insulation.

Although the time of partial discharge is short and the energy is very small, it has great harm. Its long-term existence will cause great damage to the insulating materials. On the one hand, the insulation materials adjacent to the partial discharge will be directly bombarded by the discharge particles, and the other is that the partial insulation will be damaged by the chemical action of the active gases such as heat, ozone and nitrogen oxide produced by the discharge After corrosion aging, the electrical conductivity increases and finally leads to thermal breakdown. The aging and damage of internal insulation of transformer in operation starts from partial discharge.

The above is Huaxing special change for you to explain the cause of partial discharge of transformer, do you understand it? If you want to know other relevant information or purchase intention, you can pay attention to the official website of Huaxing special transformation.


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