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Short-circuiting device for use in low-voltage and medium-voltage systems for the protection of parts and personnel

A kind of equipment, low-voltage technology, applied in the field of short-circuit equipment, can solve problems such as equipment damage

Inactive Publication Date: 2008-10-01
DEHN SOHNE GMBH CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this series circuit only devices with a limited melting integral can be damaged in the event of a fault

Method used

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  • Short-circuiting device for use in low-voltage and medium-voltage systems for the protection of parts and personnel
  • Short-circuiting device for use in low-voltage and medium-voltage systems for the protection of parts and personnel
  • Short-circuiting device for use in low-voltage and medium-voltage systems for the protection of parts and personnel

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Experimental program
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Embodiment Construction

[0046] In the following embodiments, the same reference numerals are used for the same or identically working elements.

[0047] According to an embodiment, the consumable element 5 is of particular significance for the efficient operation of the short-circuit device. The aim of optimizing the short-circuit device is to achieve the fastest possible closing movement of the main contact electrodes and very low loading of the switching element. In addition to the contact gap, the mass of the moved contact, and the effective counteraction, the closing movement speed of the main contacts is mainly determined by the force-displacement travel characteristic (Kraft-Weg-Kennlinie) of the spring 4 used. The greater the initial force in the tensioned state and the greater the residual force in the closed state of the crowbar, the shorter the closing time of the main contacts.

[0048] The mass and the spring force of the moved contact permanently act on the consumable element under tens...

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Abstract

The invention relates to a short-circuiting device for use in low-voltage and medium-voltage systems for the protection of parts and personnel, comprising a switching element, which can be actuated by the tripping signal of a fault detection device, two mutually opposite contact electrodes having power supply means, wherein contact can be made with said contact electrodes at a circuit having connections at different potentials, furthermore the contact electrodes, under mechanical prestress, carry out a relative movement in relation to one another in the event of a short-circuit assisted by spring force, and a further part short-circuits the contact electrodes in a relative movement with respect to said contact electrodes, a sacrificial element as the spacer between the contact electrodes and having an electrical connection between the sacrificial element and the switching element,; on the one hand, and one of the contact electrodes, on the other hand, in order to bring about thermal destruction of the sacrificial element in a targeted manner owing to current flow. In a first embodiment of the invention, the sacrificial element is a thin-walled hollow cylinder consisting of a high-melting metallic material. In a second embodiment of the invention, the sacrificial element is a wire or rod consisting of a conductive material having a low melting integral, wherein the sacrificial element is under mechanical prestress under tension in contrast to the first embodiment.

Description

technical field [0001] The invention relates to a further development of a short-circuit device for component and personnel protection in low- and medium-voltage installations according to the preamble of claim 1, comprising a switching element operable by a trigger signal of a fault detection device; two with Opposite contact electrodes of the power supply, wherein the two contact electrodes are electrically contactable with terminals of different potentials, in addition, the contact electrodes are elastically supported against each other in the event of a short circuit when they are under mechanical prestress movement; a consumable element (Opferelement) as a separator between the contact electrodes; and an electrical connection between them with a consumable element and a switching element as one side and one of the contact electrodes as the other side, in order to generate consumption in a targeted manner Thermal damage of components dependent on current flow. [0002] Fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H79/00H01T1/14
CPCH01T2/02H01T1/14H01H79/00
Inventor 彼得·扎赫曼阿恩德·埃尔哈特
Owner DEHN SOHNE GMBH CO KG
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