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Multi-terminal line protection fault positioning and distance measuring method

A line protection and fault location technology, applied in the field of power system, can solve the problem of ineffective distance measurement of multi-terminal lines, and achieve the effect of solving the problem of ineffective distance measurement, precise positioning and distance measurement

Pending Publication Date: 2022-02-01
BEIJING SIFANG JIBAO ENG TECH +1
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  • Application Information

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Problems solved by technology

[0008] In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a method for fault location and distance measurement of multi-terminal line protection, so as to solve the problem of inability to effectively measure distance when multi-terminal line faults occur

Method used

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  • Multi-terminal line protection fault positioning and distance measuring method
  • Multi-terminal line protection fault positioning and distance measuring method
  • Multi-terminal line protection fault positioning and distance measuring method

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Embodiment Construction

[0069] The application will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present application.

[0070] At first the following technical terms used in the present invention are described or defined:

[0071] Multi-terminal longitudinal current differential protection: for 3-terminal and above lines, each line node is equipped with a multi-terminal longitudinal current differential protection device. When faults occur in the multi-terminal line area, if the differential protection operating conditions are met, the multi-terminal longitudinal current differential protection at each line node operates simultaneously.

[0072] figure 1 It is a schematic diagram of the main wiring of N T nodes and N+2 terminal lines. There are N T nodes, N+2 terminal lines, and a total of 2N+2 electrical quantit...

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Abstract

The invention discloses a multi-terminal line protection fault positioning and distance measuring method, which comprises the following steps of: after a pilot current differential protection action configured by a multi-terminal line protection device, calculating each sequence voltage and sequence current of a line node according to the voltage and current at a protection installation position; calculating each sequence voltage at a T node according to each sequence voltage and sequence current of a line node, wherein each T node is connected with three electric quantity nodes, so that three positive sequence voltages, three negative sequence voltages and three zero sequence voltages can be obtained; according to different fault types, setting the sequence component voltage of the maximum voltage difference as discrimination voltage; and according to sequence voltage differences derived from different sides of the T node, determining the position of a fault point is judged in combination with a dichotomy; and when the fault point is at the T node, directly acquiring the distance measurement result; or when the fault point is on the line, equivalizing the electric quantity nodes on the two sides of the fault point to a double-end system for distance measurement. According to the method, accurate distance measurement can be realized when a fault occurs in a multi-terminal line with three terminals and more than three terminals.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a method for fault location and distance measurement of multi-terminal line protection. Background technique [0002] Line protection currently mainly includes single-ended ranging and double-ended ranging. [0003] Single-ended ranging is realized by distance protection. The single-end distance measurement is to use the single-end voltage, current and other fault information of the line to form a distance measurement algorithm, and calculate the distance from the fault point to the protection installation by measuring the reactance X value. Because single-ended ranging is affected by the auxiliary current, it is mainly used for ranging on this line; due to the influence of transition resistance, it is mainly used for metallic short-circuit faults. [0004] Prior art document 1 (CN111527661A) discloses a fault location method in a multi-terminal tapped line. The power t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/08Y04S10/52
Inventor 熊军伍叶凯赵志宏张月品杜兆强张钊黄继伟
Owner BEIJING SIFANG JIBAO ENG TECH
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