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A method for automatic adjustment of failure protection delay through tail current identification

A failure protection and trailing current technology, which is applied in the direction of measuring current/voltage, emergency protection circuit devices, electrical components, etc., can solve problems such as failure protection and misoperation, so as to prevent misoperation, shorten return time, and reduce the risk of misoperation Effect

Active Publication Date: 2021-08-13
NARI TECH CO LTD +4
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] In view of the deficiencies in the above-mentioned existing research, the purpose of the present invention is to provide a method for suppressing tailing current and preventing malfunctioning protection malfunction, so as to solve the problem of the risk of malfunctioning protection malfunctioning in the prior art

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  • A method for automatic adjustment of failure protection delay through tail current identification
  • A method for automatic adjustment of failure protection delay through tail current identification
  • A method for automatic adjustment of failure protection delay through tail current identification

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Embodiment Construction

[0052] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0053] Failure protection is an important part of power grid safety protection. When the failure protection refuses to operate, the fault point will not be effectively removed, which will cause further damage to equipment and further deterioration of grid operation stability. However, if the failure protection malfunctions, that is, the circuit breaker has correctly isolated the fault point, but due to the failure protection malfunction, all adjacent circuit breakers still have to be tripped, which will inevitably increase the power outage range of the power grid.

[0054] In addition, in order to solve the problem that the switch failure fault isolation time is too long, some circuit breakers m...

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Abstract

The invention discloses a method for suppressing trailing current and preventing misoperation of failure protection. The fault current is processed by a differential filter algorithm to obtain the first current data; the fault current is processed by the full-circle Fourier algorithm to obtain the second data. current data; processing the first current data by half-wave integration to obtain third current data; judging whether the third current data and the second current data meet the failure action threshold at the same time, and if they meet the failure action threshold at the same time, then Initiate failsafe action. The invention is suitable for the occasion where "tailing current" exists in the relay protection secondary current transformer after a short-circuit fault occurs in the power system, can effectively reduce the influence of the tailing current, and prevent malfunction protection from malfunctioning.

Description

technical field [0001] The invention relates to a method for automatically adjusting the time delay of failure protection through tailing current identification, which belongs to the relay protection of electric power system. Background technique [0002] Circuit breaker failure protection is a backup protection widely used in power systems. According to the principle of circuit breaker failure protection, the delay setting value of circuit breaker failure protection should consider the sum of circuit breaker action time, current element protection return time and time coordination margin. When the system fails, the relay protection will trip the outlet after detecting the failure. After the circuit breaker is disconnected, the CT current tailing phenomenon may occur due to the decaying DC component. At this time, the CT current is not zero, but gradually decays to zero according to a certain time constant. It may cause the return time of the current element to be too long...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22G01R19/165
CPCG01R19/165H02H7/22
Inventor 郑玉平吴通华余洪王小红戴魏姚刚
Owner NARI TECH CO LTD
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