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Self-healing capacitor element

A technology of self-healing capacitors and components, applied in the direction of capacitors, electrical components, etc., can solve problems such as capacitors can no longer restore insulation, capacitors catch fire, burn capacitors, etc., to eliminate self-healing failures, improve self-healing performance, reduce electrical damage effect

Inactive Publication Date: 2013-08-21
CHINA XD ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Self-healing failure means that if a local single self-healing occurs, the material in this area is damaged and leads to continuous self-healing, breakdown and recovery alternately occur and the fault expands, and finally the capacitor can no longer restore insulation
If no additional measures are taken to stop the failure before eventual self-healing failure, the capacitor may catch fire or burst and burn the capacitor

Method used

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  • Self-healing capacitor element
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Examples

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Embodiment Construction

[0019] refer to figure 1 , the capacitor element has a plastic shell 5, which has a cylinder 4 wound by two layers of metallized film, one layer of the metallized film is a flat metallized film, and one layer is an isolated metallized film, and the cylinder There is a hollow pipe 9 in the middle of 4. Both ends of the cylinder 4 are sprayed with a gold spraying machine to form an upper metal layer 11 and a lower metal layer 6, the first electrode 1 is welded to the upper end of the cylinder 4, and the second electrode 12 is welded to the lower end of the cylinder 4 through the hollow tube 9 , the first plunger 7 and the second plunger 10 are fixed at both ends of the hollow tube 9, both of which have the function of positioning and insulating between electrodes, and the isolation type metallized film is a single string type. Cylindrical components, electrodes, are fixed in the housing 5 through the upper bracket 3, and then the interior of the plastic housing 5 is filled with...

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Abstract

The invention provides a self-healing capacitor element which comprises a shell body, wherein a cylinder formed by at least two layers of metallized films in a wound mode is arranged in the shell body in a closed mode. Two ends of the cylinder are connected with a first electrode and a second electrode respectively, the metallized films at least comprise a flat type metallized film layer and an isolated type metallized film layer, and at least one flat type metallized film layer is arranged between two adjacent isolated type metallized films. Due to the fact that the adopted isolated metallized films carry out isolation and partition on the flat type metallized films, electric damage of single-point healing to peripheral regions is reduced, the fault area of a capacitor is shortened, and energy in healing is also limited. Therefore, self-healing failure is greatly reduced or eliminated, self-healing performance is improved, operating safety of the capacitor is guaranteed, and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of power capacitors, in particular to a self-healing capacitor element. Background technique [0002] The self-healing capacitor is a cylinder formed by winding at least two layers of metallized film, and metal particles are attached to the two ends of the cylinder to form a pole plate, and then the electrode is drawn out through a metal lead wire. If a capacitor fails, it is desirable to isolate the capacitor from the grid or operating system, and failures within self-healing capacitors are generally self-healing failures. Self-healing means that when the insulating film breaks down, a short-circuit current is generated between the metal layers. The heat generated by this large current will evaporate the metal coating around the breakdown point, thus isolating the original short-circuit fault point and restoring the insulation performance. Self-healing failure means that if a local single self-healing occurs, the ma...

Claims

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Application Information

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IPC IPC(8): H01G2/18
Inventor 高琪李维维恒超
Owner CHINA XD ELECTRIC CO LTD
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