Dry type power electronic capacitor with resin shell

Abstract

The present invention discloses a dry type power electronic capacitor with a resin shell. The capacitor is formed by the resin shell, cores, wiring terminals and filled resin. The resin shell comprises a shell body and an embedded nut. Each of the cores comprises elements, a connection copper foil, an internal insulation piece, a fixed insulation plate, a bandage and a wire outlet copper foil. The wiring terminals are installed at the top surface of the capacitor shell and are connected to the wire outlet copper foils of the cores. The filled resin comprises resin filled in the gaps between the cores, the gaps between the elements, and a shell gap. The invention provides the dry type power electronic capacitor with a resin shell has the advantages of the reduction of the weight and size of the capacitor, safe and stable operation, no pollution and the reduction of partial discharge, and the capacitor is a novel power electronic capacitor with the satisfaction of requirements in the field of rail transport.

Description

technical field [0001] The invention relates to a metallized film capacitor, in particular to a dry-type power electronic capacitor with a resin shell. Background technique [0002] With the development of the domestic power electronics industry, converter technology has developed rapidly. In recent years, rail transit, smart grid, high voltage inverter, SVG, photovoltaic, wind power and other fields have been well developed. The market demand for power electronic capacitors is growing. [0003] At present, power electronic capacitors include oil-immersed capacitors and dry capacitors. [0004] Oil-immersed capacitors consist of a stainless steel shell, core and impregnated vegetable oil or silicone oil. [0005] Dry capacitor is composed of stainless steel case, case cover, insulator, guide rod, core and poured resin. [0006] With the trend of miniaturization and light weight of products in the field of power electronics, there is an urgent demand for dry-type, small-s...

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Problems solved by technology

[0008] The specific gravity density of stainless steel is 7.93g / cm 3 , the weight of the shell is relatively large; considering the insulation between the core and the box shell, there is usually a certain gap, and a certain amount of resin is poured; the connection between the core and the bottom of the guide rod needs to be considered, and there is usually a large gap. The capacitor is large and heavy; the insulator is installed on the box cover, and the insulator is relatively high considering the creepage distance, and the guide rod is also long, which increases the size and weight of the capacitor

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