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Short-circuit detection method and device

A short-circuit detection and circuit technology, which is applied in the field of circuits, can solve problems such as inability to realize current limiting in advance and affecting ZSI functions

Inactive Publication Date: 2012-11-28
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the short circuit cannot be detected early, the current limit cannot be realized in advance, and it is very likely that two different levels of protection areas will be protected at the same time, which will affect the realization of the ZSI function

Method used

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  • Short-circuit detection method and device

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Embodiment Construction

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following examples are used to further describe the embodiments of the present invention in detail.

[0044] In general, an AC power supply network can be equivalent to figure 1 The circuit configuration shown. In some cases, the AC power supply network can also be equivalent to other forms. Here only figure 1 The equivalent circuit shown is taken as an example to describe the present invention. Such as figure 1 As shown, the equivalent circuit structure includes an alternating voltage source V(t) and at least one resistive load R and one inductive load L. Among them, the resistive load R and the inductive load L may vary with the actual situation. For example, when a short-circuit fault occurs, the power supply network can still be equivalent to figure 1 The structure shown, but the difference is that when a short circuit occurs, the resistive...

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Abstract

The invention discloses a short-circuit detection method and a short-circuit detection device. The short-circuit detection method comprises the following steps of: sampling n transient current values of a circuit, wherein n is an integer more than or equal to 3; acquiring n current integral values corresponding to sampling moments of the n transient current values; determining an estimation value of a current peak value of the circuit by using the n transient current values and the n current integral values according to an ohm law equation of the circuit; and if the estimation value of the current peak value is greater than a preset threshold value, determining that short circuit occurs. The embodiment of the invention also provides the short circuit detection device. According to the short-circuit detection method and the short-circuit detection device which are provided by the embodiment of the invention, short circuit can be timely detected before short circuit current reaches the peak value.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to a short circuit detection method and device. Background technique [0002] In power distribution networks, circuits are usually protected against short circuits by means of circuit breakers. That is, when the occurrence of a short circuit is detected, the circuit breaker is caused to disconnect the power supply line. However, a large short-circuit current (usually tens to hundreds of KA) that occurs during a short circuit will damage the circuit breaker, such as damage to the mechanical contacts of the circuit breaker. Therefore, it is always desirable to detect the occurrence of a short circuit early before the short circuit current reaches its peak value, so that the circuit breaker can be tripped in time when the short circuit current is not large enough to damage the circuit breaker, thereby protecting the circuit breaker and prolonging the service life of the circuit break...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165G01R31/02
Inventor 杜峰陈维刚闵应宗卓越
Owner SIEMENS AG
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