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A Fault Type Identification Method Based on Differential Current and Fault Characteristic Quantities

A technology of fault type identification and fault feature quantity, applied in the direction of measuring electrical variables, measuring current/voltage, measuring devices, etc., can solve the problem of lack of fast identification methods of fault types, and achieve the effect of eliminating fault type identification and processing

Active Publication Date: 2021-10-12
DONGFANG ELECTRONICS
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] For devices with differential protection, especially those with busbar differential protection, there is currently a lack of rapid identification methods for fault types suitable for device characteristics

Method used

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  • A Fault Type Identification Method Based on Differential Current and Fault Characteristic Quantities

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Experimental program
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Embodiment Construction

[0030] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0031] like figure 1 , a fault type identification method based on differential current and fault characteristic quantity, which is implemented by using embedded software to write corresponding programs in the device software design based on bus differential protection. like figure 1 As shown, this method mainly includes two parts: data preparation and processing and identification and judgment, both of which are performed simultaneously in real time. The specific method is as follows:

[0032] 1) Allocate storage variables in the device software.

[0033] Assign relay words dwRWAN, dwRWBN, dwRWCN, dwRWAB, dwRWBC, dwRWCA, dwRWABN, dwRWBCN, dwRWCAN, dwRWABC and dwRWABCN to logically identify fault types and record them in real time. The specific names of the above variables are: AN ground fault type relay word dwRWAN, BN ground fault type relay word ...

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Abstract

The invention discloses a fault type identification method based on differential current and fault characteristic quantity. The steps include: real-time calculation of the maximum branch current value, maximum phase current value and maximum zero-sequence current value of each phase, and then carry out phase identification of fault characteristics inside and outside the protection zone and ground fault characteristics identification inside and outside the protection zone according to the calculated values, and The judgment result is written into the fault characteristic phase flag word and the ground fault characteristic flag word; finally, combined with the real-time updated fault characteristic phase flag word and ground fault characteristic flag word, the logical judgment of the fault type is carried out. The invention combines the differential current with the fault feature quantity, and proposes a novel, practical, simple and reliable fast fault type identification method, which is especially suitable for a bus differential protection device.

Description

technical field [0001] The invention relates to a method for identifying the fault type of a short-circuit fault in an electric power system, which is mainly used in busbar differential protection to realize fast fault type identification and message recording, and belongs to the technical field of electric power system relay protection. Background technique [0002] In order to meet the requirements of microcomputer relay protection device (hereinafter referred to as the device) fault action information recording and fault wave recording, it is necessary for the device to quickly identify the type of system fault and record it accurately and timely to help customers analyze accidents, make targeted repairs and Restore power ahead of time. [0003] For devices with differential protection, especially those with busbar differential protection, there is currently a lack of rapid identification methods for fault types that are suitable for device characteristics. Contents of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/165G01R31/52
CPCG01R19/16528G01R19/16571
Inventor 权宪军周前林海锋孙建波杨泽平姜光王建功赵洪强孔祥乾聂德顺
Owner DONGFANG ELECTRONICS
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