Low noise self-heating type power capacitor

Abstract

The invention discloses a low noise self-heating type power capacitor. The low noise self-heating type power capacitor comprises a shell in which two cores are arranged, wherein a lead terminal closeto a cover plate is designed to be a small capacity capacitor, and meanwhile the small capacity capacitor close to the lead terminal adopts a metallized polypropylene film with thick medium and low sheet resistance; the lower side of the small capacity capacitor is designed to be a high capacity capacitor, and a mesh-shaped anti-explosion gradual-changed sheet resistance metallized security film with conventional medium and high gradual-changed sheet resistance is used; a support plate is welded with the bottom end of the small capacity capacitor; the support plate is welded with the bottom ofthe shell via two support pillars on two sides; and the high capacity capacitor is directly welded with the bottom of the shell. The low noise self-heating type power capacitor provided by the invention adopts the design of a two-layer core structure; the small capacity capacitor is used for absorbing high frequency harmonic waves; the high capacity capacitor is used for achieving the characteristics of high voltage climbing speed, good high frequency performance and large energy storage density; the big current is extremely high in sensitivity and self-healing and can effectively isolate andself-heal the breakdown part, and the noise can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a low-noise self-healing power capacitor. Background technique [0002] Power capacitors are capacitors used in power systems and electrical equipment. Any two metal conductors are separated by an insulating medium to form a capacitor. The size of the capacitance of the capacitor is determined by its geometric size and the characteristics of the insulating medium between the two plates. When the capacitor is used under AC voltage, its reactive power is often used to represent the capacity of the capacitor, and the unit is var or kvar. Intelligent power reactive power compensation capacitors provide solutions for improving the power factor of power supply and improving the efficiency of the power grid. The main application areas are: factory power distribution system, residential quarter power distribution system, municipal commercial building, traffic tunnel power distributio...

AI Technical Summary

Problems solved by technology

However, the shell of the power capacitor of the high-voltage AC and DC filter capacitor bank is easy to generate certain noise due to the vibration of the shell caused by the core. Therefore, we propose a low-noise self-healing power capacitor to meet today's needs

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