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Electronic tripgear for low-voltage circuit breaker

An electronic trip, low-voltage circuit technology, applied in circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as unsuitable phase and neutral point current configuration

Inactive Publication Date: 2004-09-22
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, known algorithms for calculating the value of the earth fault current are not suitable for all configurations of phase and neutral point currents, especially when the currents are not in a purely sinusoidal form

Method used

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  • Electronic tripgear for low-voltage circuit breaker
  • Electronic tripgear for low-voltage circuit breaker
  • Electronic tripgear for low-voltage circuit breaker

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Experimental program
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Embodiment Construction

[0023] The electronic trip device of the present invention will be described with reference to a low-voltage automatic circuit breaker, without thereby limiting the field of application of the present invention in any way.

[0024] refer to figure 1 , in the present invention, the electronic trip device for low-voltage circuit breaker, especially for low-voltage multi-pole automatic circuit breaker comprises a device 1 for detecting and calculating the ground fault current, which is operatively connected to said circuit breaker associated tripping device.

[0025] For each pole, said means 1 for detection and calculation comprise current sensor means 10 which provide a signal 11 proportional to the current flowing in said pole. The current sensor arrangement 10 can conveniently be formed by a current transformer, wherein the signal 11 is generated in the secondary winding of the current transformer due to the current flowing in the phase conductors making up the primary windi...

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Abstract

An electronic tripping device for low-voltage circuit-breakers comprises means for detection and calculation of a ground-fault current operatively connected to tripping means of said circuit-breaker. The means for detection and calculation comprise: current-sensor means, which supply, for each pole, a signal proportional to the current; means for detection of the sign of the current, which, for each pole, supply a signal representing the sign of the current; current-rectifying means, which, for each pole, supply a rectified signal proportional to the current circulating in said pole; and first numerical-processing means, which supply a value with sign representing a ground fault by means of a numerical-processing operation comprising the multiplication of the signal representing the sign by the corresponding rectified signal.

Description

technical field [0001] The invention relates to an electronic tripping device for a low-voltage circuit breaker, especially a low-voltage multi-pole automatic circuit breaker for power grid protection. Background technique [0002] Automatic circuit breakers, which perform the protective function of avoiding ground faults, employ circuits for measuring and reproducing the total amount of electrical network current. Typically, the protected grid consists of electrical conductors corresponding to the three phases and neutral points of the equipment. Contacts for closing and opening circuits enable or interrupt the flow of current in the phase conductors. Normally, in most installations, the neutral conductor is distributed without interruption. [0003] A plurality of current transformers T1 , T2 , T3 and TN associated with the different conductors of the grid transform the primary currents of the circuit into secondary currents suitable for electrical contact circuit breake...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/16
CPCH02H3/165Y10T307/937G01R31/025G01R31/52
Inventor 瑟沃利诺·克勒伯安东尼·M·格伯勒
Owner ABB (SCHWEIZ) AG