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Switching on/switching off information-based single-phase ground fault logic judgment method

A single-phase grounding fault, judgment method technology, applied in the fault location and other directions, can solve the problem of automatic line selection, tripping, line cutting, etc., and achieve the effect of increasing the accuracy rate

Inactive Publication Date: 2017-06-30
济南置真电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the existing technology, the present invention proposes a single-phase ground fault logic judgment method based on opening and closing information, which solves the problem that the traditional technology cannot automatically select the line to trip and switch the line after the single-phase ground fault

Method used

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  • Switching on/switching off information-based single-phase ground fault logic judgment method

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Embodiment 1

[0031] A single-phase ground fault logic judgment method based on opening and closing information of the present invention, it uses at least one transient method to analyze and judge the single-phase ground fault recording data to obtain at least one single-phase ground fault line selection result, And sequentially pull the lines in each single-phase ground fault line selection result to determine the ground fault line. The single-phase ground fault recording data includes the starting time, not less than 10 ms before the time when the opening and closing signal command is issued, and not less than 90 ms after the starting time, and the time when the opening and closing signal command is issued.

[0032] After pulling all the lines in the line selection result of the single-phase ground fault, if the fault still exists, call the recorded wave data before and after the last closing to re-select the line, and re-select the line obtained during the re-selection process. The lines...

Embodiment 2

[0037] Another single-phase ground fault logic judgment method based on opening and closing information of the present invention, it first obtains single-phase ground fault recording data, and then uses the transient amplitude comparison method, transient polarity comparison method and transient power The direction method and the three transient methods respectively analyze and judge the single-phase ground fault recording data, obtain at least one single-phase ground fault line selection result, and sequentially pull the lines in each single-phase ground fault line selection result circuit to determine the ground fault circuit.

[0038] Such as figure 1 As shown, the single-phase ground fault logic judgment method includes the following specific steps:

[0039] Step 1, start and save the single-phase ground fault recording data at time t0;

[0040] Step 2, using the transient amplitude comparison method, transient polarity comparison method and transient power direction met...

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Abstract

The invention discloses a switching on / switching off information-based single-phase ground fault logic judgment method. At least one transient method is adopted to analyze and judge single-phase ground fault recording data so as to obtain at least one single-phase ground fault line selection result; the power supply switch of each line in the single-phase ground fault line selection results is switched on sequentially, so that a ground fault line can be determined. According to the method of the invention, a plurality of transient methods are adopted to analyze and judge the single-phase ground fault recording data so as to obtain the at least one single-phase ground fault line selection result; the power supply switch of each line in the single-phase ground fault line selection results is switched on sequentially, so that the ground fault line can be determined; and therefore, switching on / switching off information is fully utilized to perform logic judgment on a single-phase ground fault; as for a wrongly judged fault line, the power supply of the line can be restored quickly; and strategy selection that the lines are switched sequentially according to specific logic relationships is adopted, so that a fault line can be found out fast. Since the plurality of transient methods are adopted to analyze and judge the single-phase ground fault recording data, the accuracy of line selection results can be increased.

Description

technical field [0001] The invention relates to a single-phase ground fault line selection method, in particular to a single-phase ground fault logic judgment method based on opening and closing information, and belongs to the technical field of electric power system relay protection. Background technique [0002] The single-phase-to-earth fault is the most frequent type of fault in 6-35kV medium voltage distribution network. After a single-phase ground fault, the system is allowed to continue to operate with the fault within a maximum of 2 hours to improve power supply reliability. However, long-term operation will easily cause the fault to expand into a two-point or multi-point grounding short circuit. Arcing grounding will also cause overvoltage in the entire system, which will damage the equipment and undermine the safe operation of the system. Therefore, it is necessary to find the faulty line in time and remove it. [0003] Usually, the single-phase ground fault line ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 王涛
Owner 济南置真电气有限公司
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