What is the working principle of polypropylene film capacitor

The working principle of polypropylene film capacitor is the same as that of ordinary capacitor. It stores electric energy by storing charge on the electrode. It is usually used together with inductor to form LC oscillation circuit. The working principle of capacitor is that the charge will move under the force in the electric field. When there is a medium between the conductors, it will hinder the charge movement and make the charge accumulate on the conductor, resulting in the accumulation of charge Storage.

Film capacitor can be said to be a kind of capacitor rapidly rising in the development trend in recent years. The capacitor is made of metal foil as electrode, which is overlapped with plastic film such as polyethylene, polypropylene, polyethylene or polycarbonate from both ends and wound into a cylindrical structure. Because of its high insulation impedance, excellent frequency characteristics (wide frequency response) and small dielectric loss, thin film capacitors are widely used in analog circuits. It can be divided into metallized polyester film capacitor and metallized polypropylene film capacitor according to different media of raw materials.

Maintenance method of capacitor:

1. The shell of capacitor shall be well grounded, and the selected capacitor switch shall be equipped with contactor with discharge contact

2. During the operation of capacitor, special attention should be paid to ventilation and cooling.

3. When installing the capacitor, the screw of the power line and the terminal of the capacitor must be tightened, and there should be no looseness, so as to prevent the equipment from burning out due to heating caused by looseness.

4. After the capacitor has been running for a period of time, the screws of each connection point should be checked regularly and tightened again.

5. Remove the dust on the capacitor regularly to prevent short circuit caused by static electricity generated by dust.