Self-healing parallel capacitor structure

Abstract

The invention discloses a self-healing parallel capacitor structure. The self-healing parallel capacitor structure comprises a top cover, an aluminum tank, an element, a pressure relief pipe, a bottom cover, an insulating copper belt and resin, wherein the top cover is arranged at the top of the aluminum tank; the bottom cover is arranged at the bottom of the aluminum tank; the aluminum tank is internally equipped with the insulating copper belt and the element; a hollow thin-wall circular ring is arranged in the middle of the upper part of the bottom cover; one end of the pressure relief pipe is connected with the hollow thin-wall circular ring and the other end of the pressure relief pipe is connected with the top cover; a connection part of the pressure relief pipe and the bottom cover is in interference fit and has no gap, and a pressure relief channel is formed; a ladder-shaped round structure is arranged at a connection part of the hollow thin-wall circular ring and the bottom cover; the element is supported by the ladder-shaped round structure; the insulating copper belt is connected with the top cover through welding; the insulating copper belt is distributed at the outer side of the element; gaps among the aluminum tank, the top cover, the bottom cover and the element are filled with resin. According to the self-healing parallel capacitor structure disclosed by the invention, problems that pressure relief and welding are difficult are solved; the self-healing parallel capacitor structure is simple in structure and convenient in assembling; the product has a good heat dissipation property and stable performances, is safe to operate and is long in service life.

Description

technical field [0001] The invention belongs to the field of electric power and relates to a capacitor, in particular to a self-healing parallel capacitor structure. Background technique [0002] Capacitors are widely used as a reactive power source for reactive power compensation in domestic power systems, and their reliable operation is directly related to the safe, stable and economical operation of the power system. When the capacitor reaches the end of its service life or when there is overvoltage or overcurrent for a long time, a very high pressure will be generated inside. When the internal pressure of the capacitor reaches the threshold value of the action, the top of the capacitor will bulge, and the terminal will be disconnected from the internal connection, thereby disconnecting from the capacitor. The power grid is disconnected to achieve the protection effect. Especially for dry self-healing shunt capacitors filled with hard resin, this protection is not only c...

AI Technical Summary

Problems solved by technology

Especially for dry self-healing shunt capacitors filled with hard resin, this protection is not only closely related to the top cover of the capacitor, but also closely related to the pressure relief channel of the capacitor. Currently, due to structural limitations in the use of such capacitors , the design of the pressure relief channel is unreasonable, so that the capacitor cannot be quickly removed from the power grid when it fails, and the belly explosion phenomenon occurs from time to time, and even catches fire. There are potential safety hazards and unnecessary losses to customers.

[0003] Most of the self-healing shunt capacitors are connected by copper wires. When the copper wires are connected to the components, the multi-strands are scattered, which brings great difficulties to the welding. False soldering occurs from time to time, and the copper wire routing path is placed in the core tube. The center of the entire capacitor, the disadvantage of this connection method is that the contact resistance of the capacitor is very large, the heat is difficult to dissipate when the capacitor is in normal operation, and there is a great potential safety hazard

[0004] The structure design of the inner bottom cover of the capacitor is unreasonable, so that the resin cannot be fully filled into every corner of the capacitor

Affects heat shrinkage and heat dissipation of capacitors

Capacitor performance is unstable and life is not long

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