A method for controlling a protective device
A control method and technology for protection devices, which are applied in emergency protection circuit devices, components of emergency protection devices, circuit devices, etc. The effect of the action to remove the fault
Active Publication Date: 2020-04-07
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology
[0004] The embodiment of the present application provides a protection device control method and a computer-readable storage medium, which solves the problem of the failure of the second harmonic braking of the ratio differential protection relying on the second harmonic braking due to the influence of the inrush current. Technical Problems of Misoperation of Motion Protection
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[0048] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0049] The protection device control method provided by the embodiment of the present application is intended to solve the technical problems of the failure of the second harmonic braking of the ratio differential protection relying on the second harmonic braking and the malfunction of the differential protection due to the influence of the inrush current .
[005...
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The embodiment of the invention discloses a protection device control method, which comprises the following steps: if a calculated difference stream abrupt change is greater than a preset abrupt change threshold value, calculating the second harmonic content of a first difference stream according to the first difference stream corresponding to a current moment; If the second harmonic content is greater than a preset second harmonic threshold, starting an inrush current distinguishing logic; calculating a first non-periodic component amplitude of the first differential stream; according to thefirst non-periodic component amplitude and a second non-periodic component amplitude, judging whether the non-periodic component amplitude of the differential stream has an increasing interval in thetime domain or not, wherein the second non-periodic component amplitude corresponds to a second differential stream at a second moment, and the second moment is before the current moment; If yes, switching the original braking characteristic of differential protection to a preset high braking characteristic, and switching back to the original braking characteristic until the detected differentialcurrent is lower than a preset differential current threshold value. According to the invention, the technical problems of secondary harmonic braking failure and differential protection malfunction due to the influence of sympathetic inrush current are solved.
Description
technical field [0001] The present application relates to the technical field of relay protection, and in particular to a method for controlling a protection device and a computer-readable storage medium. Background technique [0002] Over the years, there have been many accidents in the power grid that caused adjacent operating transformers, generators or transmission line protection misoperations due to transformer airdrops. Among them, inrush currents are closely related to such misoperation accidents. [0003] The inrush current is generated in the transformer running adjacent to the airdrop transformer, which has a transient increase phase and a stable decay phase in the time domain. In the stable attenuation stage, under the action of the non-periodic component of the inrush current decaying slowly, the current transformer CT is prone to transient saturation, resulting in a decrease in the second harmonic content of the measured differential current. In this way, for ...
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IPC IPC(8): H02H7/045H02H1/04
CPCH02H1/043H02H7/045
Inventor 王育学王增超刘琨黄明辉曾耿晖刘玮李一泉陈桥平朱晓华刘世丹
Owner GUANGDONG POWER GRID CO LTD