Transmission line distance protecting method

A transmission line and distance protection technology, applied in circuit devices, emergency protection circuit devices, automatic disconnection emergency protection devices, etc. protection and other issues to achieve the effect of long availability

Inactive Publication Date: 2009-02-04
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sudden change of working voltage used by this method only exists in the initial stage of the fault, so this protection cannot reliably realize the backup protection of EHV and UHV transmission lines.
At the same time, due to the distribution parameter characteristics of UHV transmission lines, the power frequency variation distance protection may exceed the phenomenon

Method used

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Embodiment Construction

[0032] The invention proposes a negative-sequence distance protection and a positive-sequence abrupt change distance protection based on the line Berillon model. Among them, the negative sequence distance protection is used to protect various types of faults in the line except three-phase faults, while the positive sequence mutation distance protection is specially used to protect the line in the case of three-phase faults, as a supplement to the negative sequence distance protection. Therefore, the combination of negative-sequence and positive-sequence mutation distance protection constitutes a new complete distance protection scheme for transmission lines.

[0033] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. Before introducing it in detail, a brief introduction to the Beryllon model is given first.

[0034] 1. Beryllon model of transmission line

[0035] There is a coupling relationship between the ...

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Abstract

This invention relates to a method for protecting distance of transmission lines, which puts forward a distance protection method of negative sequence and positive sequence mutation volume based on the Bergeion model, in which, the negative sequence distance protection is used in protecting circuits of various fault kinds except three-phase fault and the positive sequence mutation distance protection is especially used in protecting the circuit when three-phase fault happens so as to realize complete distance protection by combining negative and positive mutation volume.

Description

technical field [0001] The invention relates to the field of relay protection for power system transmission lines, in particular to a distance protection method for transmission lines. Background technique [0002] Distance protection is the most widely used protection method in power system transmission network. High-voltage transmission lines use distance protection as the main line protection, EHV and UHV transmission lines use distance protection as the line backup protection, and some lines also use distance longitudinal protection as the main protection for EHV and UHV lines. At present, the distance protection widely used in power system transmission lines includes distance protection based on measured impedance and power frequency variation distance protection. [0003] The distance protection based on the measured impedance distinguishes internal and external faults by measuring the distance from the short-circuit point to the protection installation. It has the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H3/28
Inventor 贺家李李斌李永丽
Owner TIANJIN UNIV
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