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Device for the protection of an electrical installation against voltage surges

A technology for transient voltage protection equipment, applied in the field of equipment for transient voltage surges

Inactive Publication Date: 2011-02-02
ABB FRANCE SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Again, the insensitivity to transient overstrength is thus limited by the first fuse quasi-completely ensuring the flow of the peak current

Method used

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  • Device for the protection of an electrical installation against voltage surges
  • Device for the protection of an electrical installation against voltage surges
  • Device for the protection of an electrical installation against voltage surges

Examples

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Embodiment Construction

[0054] A protective device intended to protect an electrical installation against transient voltage surges comprises two connection devices for connecting the protective device to the electrical installation. It comprises at least one varistor having two poles, wherein each pole is connected to a respective one of the two connection means. This can be a single varistor. Alternatively, these may be several varistors connected together in series and / or in parallel so as to form a block of two poles each connected to a respective one of the two connection means. In the various embodiments described below, it will be understood that references to piezoresistors also cover blocks such as piezoresistors.

[0055] The protective device also comprises a disconnector in the event of a short circuit, i.e. a disconnector which is arranged to cause at least one of the two poles of the varistor to be disconnected from the corresponding connecting device in the event of a failure of the va...

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PUM

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Abstract

The invention discloses a device (11) for the protection of an electrical installation (Ph,N) against voltage surges, comprising at least one piezoresistor (15) and a cutter (12) for cutting the piezoresistor when the short-circuit occurs on the piezoresistor (15). A pole (151) of the piezoresistor (15) is connected with the electrical installation by at least two branches which are mutually connected in parallel and used for distributing the current. The cutter comprises a device (13) which is sensitive to the current traversing one of the branches to disconnect the pole in case of failure of the piezoresistor due to short-circuit. The device may be one or many circuit breakers or fuses. The device has insensitivity to over-intensities of the current up to a certain level. Stronger insensitivity of the cutter on the transient current is ensured by acting on the branch to act on the current part flowing through the piezoresistor.

Description

technical field [0001] The present invention relates to apparatus for protecting electrical installations from transient voltage surges, notably due to lightning strikes. Such devices are also known as lightning arresters or surge protection devices. More particularly, the present invention relates to protective devices comprising one or more varistors for limiting the voltage applied to electrical installations in the event of transient voltage surges. Still more particularly, the invention relates to protective devices intended for low-voltage electrical installations. Background technique [0002] Generally, these protective devices consist of varistors connected, in the case of single-phase installations, between a phase and a neutral point of the grid supplying power to the installation to be protected. In the case of three-phase or multi-phase installations, these devices comprise several varistors, so that each varistor is connected between each phase and the neutra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H9/06
CPCH01H83/10H02H9/042
Inventor 让-伯纳德·迪库尔诺斯特凡·布雷斯孔
Owner ABB FRANCE SAS
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