Line selection based fault line selection logical decision method for layered cascade system

A method for judging system faults and a technology for system faults, which are applied to fault locations, information technology support systems, etc.

Active Publication Date: 2016-11-23
济南置真电气有限公司
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Problems solved by technology

[0006] The logical judgment method for line selection of hierarchical cascaded fault lines of substation switching stations provided by the present invention solves the problem of accurately selecting faulty stations and faulty lines when a small current grounding fault occurs in a power supply network in the form of main wiring of substation cascading multi-layer switching stations The problem

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  • Line selection based fault line selection logical decision method for layered cascade system
  • Line selection based fault line selection logical decision method for layered cascade system
  • Line selection based fault line selection logical decision method for layered cascade system

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[0020] In order to illustrate the advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments; in the following description, many specific examples have been enumerated so as to fully understand the advantages of the present invention, but the present invention can also use Other than those described herein, the present invention is not limited to the specific examples disclosed below.

[0021] as attached figure 1 As shown, it is a schematic diagram of the electrical main wiring form of the hierarchical cascaded power supply system of the monitored substation switching station; suppose the substation switching station cascaded power supply system has n layers, the first layer of substations, the second layer of switching stations 1, By analogy, it reaches the opening and closing station i-1 of the i-th floor, and the terminal opening and closing station...

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Abstract

The invention relates to a line selection based fault line selection logical decision method for a layered cascade system of a switching station of a power system transformer substation. The method includes steps of (1), performing mathematical modeling on the monitored layered cascade system of the switching station of a power system transformer substation; (2), collecting line selection results of different stations when faults occur and recording the results into a one-dimensional array; (3), providing the specific fault station and the fault line through logic judgment of the numerical value of the one-dimensional array. According to the invention, intelligent level of operation of the layered cascade power grid is improved and error selection and error operation of a station without the fault line can be avoided.

Description

technical field [0001] The invention belongs to the field of relay protection automation in electric power systems, and relates to line selection for single-phase grounding faults on the 6-66kV outgoing line side of a substation switching station, so as to reduce the power outage time caused by faulty pull lines and improve the intelligent level of system power grid operation. Background technique [0002] The neutral point of my country's 6~66kV distribution network mostly adopts the method of non-direct grounding of the neutral point. In this system, when a single-phase grounding fault occurs, the grounding short-circuit current is very small, so it is called a small current grounding system; distribution network The probability of single-phase ground fault is the highest, which can account for about 80% of the total faults. At this time, the power supply can still ensure the symmetry of the line voltage, and the fault current is small, which does not affect the continuous p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 王涛
Owner 济南置真电气有限公司
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