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Precautions for using film capacitors

Views:1     Author:Site Editor     Publish Time: 2020-12-02      Origin:Site

With the rapid development of technology, film capacitors have gradually replaced aluminum electrolytic capacitors. As a technician, what should I pay attention to when using film capacitors?

 

1) The rated voltage of the film capacitor must be in line with the voltage of the local power grid. For some power grids with excessive voltage or harmonics, due to high-order harmonics, especially the third, fifth, and seventh harmonics, the energy is large. , The hazards are also relatively strong, and measures should be taken to avoid and isolate them during configuration.

 

2) Pay attention to the operating environment temperature. Excessive operating temperature will cause the electrochemical reaction of the film capacitor to intensify, affect the heat dissipation during self-healing, and cause self-healing failure or shorten the service life. Therefore, when installing the film capacitor, avoid heat sources and improve heat dissipation and ventilation. surroundings.

 

3) The capacitor cabinet should be equipped with reasonable protection devices:

①Adjust the appropriate delay and discharge time, and the capacitor banks should be equipped with current limiting and discharge devices for input and removal. Because the internal resistance of the film capacitor is small, the surge current may be as high as tens of thousands of amperes. In order to prevent the newly input capacitor from being discharged by the capacitor first input by the side, a current limiting protection device should be installed; in order to ensure the safety of the operation and maintenance of the film capacitor , A discharge device must be installed;

②The investment and switching procedures shall comply with the principle of first investment, first investment, and second investment;

③In order to prevent frequent switching, the capacitor bank must retain enough capacity when it is cut off as a base array.

 

After reading the above points, I believe everyone will pay more attention to the use of film capacitors in the future.


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