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Overvoltage protection device with improved leakage-current-interrupting capacity

An overvoltage and voltage cut-off technology, which is applied to emergency protection circuit devices, emergency protection circuit devices, circuit devices, etc. for limiting overcurrent/overvoltage, and can solve the problem that known protection devices are not completely effective and interfere with sensitive electronic systems, etc. question

Inactive Publication Date: 2007-09-12
ABB FRANCE SAS
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the presence of such leakage currents can interfere with sensitive electronic systems downstream of protective devices such as low power differential circuit breakers or insulation test devices
[0011] Furthermore, pre-trigger circuits that work on the principle of charging a capacitor suffer from a trigger hysteresis effect due to the charging time of the capacitor
[0012] Therefore, the known protection device is not fully effective and has a certain number of weaknesses associated in particular with the design of the pre-trigger circuit

Method used

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  • Overvoltage protection device with improved leakage-current-interrupting capacity
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  • Overvoltage protection device with improved leakage-current-interrupting capacity

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Embodiment Construction

[0030] The overvoltage protection device according to the invention is designed to bypass the electrical equipment or installation to be protected.

[0031] The expression "electrical installation" refers to any device or system that may be subject to voltage disturbances, in particular transient overvoltages due to lightning strikes. Such overvoltage protection devices are often referred to as "surge arresters".

[0032] The overvoltage protection device according to the invention is preferably designed to be located between a phase of the installation to be protected and ground (earth). Furthermore, it is conceivable, without departing from the scope of the present invention, to connect the device not between a phase and ground, but between neutral and ground, between a phase and neutral, or both. between phases (differential protection).

[0033] In commonly used overvoltage protection devices, voltage cutoff elements and voltage limiting elements are usually identified, ...

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Abstract

The invention relates to a device for protecting an electrical installation (2) against overvoltages. The inventive device comprises: a main spark-gap (E1), and a pre-triggering circuit (10) which is connected to the main spark-gap (E1) such as to control the firing thereof in the event of an overvoltage. The invention is characterised in that the pre-triggering circuit (10) comprises at least one voltage-interrupting element (G) which is disposed so as, in the off state, to prevent current from passing through the pre-triggering circuit (10), such that, in the absence of an overvoltage, the leakage current consumed by the pre-triggering circuit (10) is essentially zero. The invention relates to overvoltage protection devices.

Description

technical field [0001] The invention relates to a general technical device for protecting electrical equipment or installations against voltage disturbances such as surges, in particular against transient overvoltages, for example due to lightning strikes. [0002] More specifically, the present invention relates to a device for protecting electrical installations from voltage surges, in particular transient overvoltages due to lightning strikes, wherein all of the electrical installations thus bypassed Said devices include: [0003] main spark gap, [0004] A pre-triggering circuit sensitive to voltage surges, wherein the pre-triggered circuit bypasses the electrical service and is connected to a pre-triggering element that controls the striking of the spark gap arc in the event of a voltage surge . Background technique [0005] Devices for protecting electrical equipment from overvoltages are widely used and are usually designed as "lightning arresters". Their essentia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/06H01T2/02
CPCH02H9/06H01T2/02
Inventor 文森特·安德烈·吕西安·克勒弗纳
Owner ABB FRANCE SAS
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