Development and principle of metallized film capacitors

With the rapid development of the economy, the demand for electricity is increasing, and the construction of a strong smart grid will be vigorously promoted, and at the same time, the rapid development of the electrical instrumentation industry will be promoted. As an indispensable instrument in the strong smart grid, the smart energy meter continues to expand its market share with its unique features. The development of a strong smart grid, the urgent need for the development of new products, metallized film capacitors as a broad reference to important devices in the smart energy meter.

The metallized film capacitor uses a polyester film or a polypropylene film as a medium, and the zinc aluminum alloy is trapped on the surface of the film by vacuum evaporation to form an electrode by a non-inductive stepless winding or lamination to form a capacitor. Metalized thin electric passengers have high withstand voltage, high insulation resistance, good impedance frequency characteristics (smaller parasitic inductance), low ESR, high capacity characterization, and low loss tangent.

The gold film capacitor is used for signal transmission, coupling, and voltage reduction on the electric energy meter. Metallized polyester film capacitors, as coupling capacitors, have high insulation resistance and can couple AC signals or pulse signals to the subsequent stage without damaging, while not affecting the DC operating point of the latter stage. Metallized polypropylene film capacitors are used as Due to its low frequency tangent and high capacity stability, the step-down capacitor can reduce the AC high voltage to the AC low voltage that meets the requirements of the latter stage, replacing the original transformer, making the product smaller and more stable.