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Self-protected low-voltage capacitor

A technology for capacitors and capacitor devices, which is applied in the direction of capacitors, fixed capacitor electrodes, fixed capacitor parts, etc., and can solve the problems of slow development, no gas generation, low generation speed, etc.

Active Publication Date: 2014-06-25
SCHNEIDER ELECTRIC IND SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, certain internal faults may occur that do not produce gas, or that produce gas in small quantities or at very low rates, especially if used to hinder slowly developing faults
This protection device cannot detect these internal faults due to lack of gas or low generation rate and thus cannot be activated
Also, some very localized failures can damage the enclosure before the gas produced by the internal failure is detected by the protective system

Method used

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  • Self-protected low-voltage capacitor
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] refer to figure 1 and 2 , The capacitor 2 includes a casing 4 , an insulating material 6 and a capacitive device 8 . The housing 4 defines an inner volume 10 within which the insulating material 6 and the capacitive means 8 are contained.

[0032] The capacitor 2 further comprises a protection device 12 .

[0033] Housing 4 includes a bottom wall 14 , side walls 16 and a cover 18 . The side wall 16 is tubular and closed at its ends by a bottom wall 14 and a cover 18 .

[0034] The cover 18 comprises an inner space 20 and is intended to hermetically close the housing 4 on the one hand and accommodate the protection device 12 on the other hand. The cover 18 is disposed opposite to the bottom wall 14 .

[0035] Thus, the inner volume 10 of the housing 4 is delimited laterally by side walls 16 and at its ends by a bottom wall 14 and a cover 18 .

[0036] The housing 4 has, for example, a substantially cylindrical shape.

[0037] Preferably, the housing 4 is formed of...

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PUM

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Abstract

The invention discloses a capacitor (2). The capacitor (2) according to the invention comprises: an enclosure (4); an insulating material (6) contained in the enclosure (4); a capacitive device (8) comprising two conductive layers and at least one dielectric layer formed from a dielectric material and inserted between the two conductive layers; and a protection device (12) comprising a mechanism (40) for disconnecting the capacitive device (8) in case of overpressure in the enclosure (4); and characterized in that it further comprises, inside the enclosure (4), a degassing material (58) capable of releasing gas at a degassing temperature (Tgaz) below the decomposition temperature of the dielectric material to generate an overpressure in the enclosure (4).

Description

technical field [0001] The invention relates to a capacitor comprising: [0002] -shell; [0003] - insulating material contained within the enclosure; [0004] - a capacitive device comprising two conductive layers and at least one dielectric layer formed of a dielectric material interposed between the two conductive layers; and [0005] - Protection means comprising means for disconnecting the capacitive means in case of overpressure inside the enclosure. [0006] More specifically, the present invention relates to the field of self-healing low voltage power capacitors. Background technique [0007] By "self-healing capacitor" is meant a capacitor comprising at least one capacitive device housed within an enclosure and formed from a roll of two composite bodies, each composite body comprising a conductive layer and a dielectric layer. Each conductive layer forms an electrode. Each composite is obtained by metallizing one side of the dielectric film. [0008] When a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G2/10H01G2/14
CPCH01G2/18H01G2/14H01G4/015
Inventor O.杜杰尤C.吉耶曼
Owner SCHNEIDER ELECTRIC IND SAS