A permanent failure judgement method for power transmission line with parallel reactor

A permanent fault and discrimination method technology, applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc., can solve problems such as the inability to effectively use transmission lines with shunt reactors, and meet accuracy requirements, reduce requirements, and discriminate high precision effect

Inactive Publication Date: 2008-08-13
XIAN XIRUI CONTROL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for judging permanent faults of transmission lines with shunt reactors, so as to overcome the shortcomings of the prior art that cannot be effectively used for transmission lines with shunt reactors

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  • A permanent failure judgement method for power transmission line with parallel reactor
  • A permanent failure judgement method for power transmission line with parallel reactor
  • A permanent failure judgement method for power transmission line with parallel reactor

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] Figure 1 shows the current circuit diagram of the disconnected phase when a single-phase ground fault occurs in phase A of the line with a shunt reactor at one end. in is the current flowing through the fault phase A-phase shunt reactor, is the current flowing through the small reactor at the neutral point, C 0 is the self-inductance capacitance of the line, L n , L 0 is the inductance value of the shunt reactor and the neutral point small reactor, It is the three-phase voltage of the N terminal when the fault occurs.

[0022] Figure 1(a) shows the schematic diagram of the current loop after the arc is extinguished in the case of a transient fault. It is obvious that at this time, the current forms a loop through the shunt reactor A phase, the neutral point small reactor and the M terminal A relative to ground capacitance; and for For the ...

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PUM

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Abstract

The invention relates to the field of power system transmission line relaying protection, in particular to a permanent fault identifying method for the transmission line with collateral reactor. The purpose of this invention is to overcome defects of not effectively using the transmission line with collateral reactor in the present technology. In order to overcome problems in the present technology, the embodiment of this invention is that: a permanent fault identifying method for the transmission line with collateral reactor orderly comprises the following steps: after a single-phase fault is found, the protective device phase-selecting unit confirms the fault phase; configuring the criterion and calculating the action value by using current quantity in the collateral reactor and neutral point small reactor; when the calculated action value is less than the setting value, the fault is identified as instant fault and a superposition valve processes superposition action; when the calculated action value is more than the setting value, the fault is identified as permanent fault and the superposition valve does not process superposition action. This invention has advantages of high identifying precision and reliability.

Description

Technical field: [0001] The invention relates to the field of relay protection of power system transmission lines, in particular to a method for judging permanent faults of transmission lines with shunt reactors. Background technique: [0002] Automatic reclosing technology is one of the important measures to ensure the stability of the power system and the continuity of power supply. Especially with the increase of transmission voltage level and the increase of insulation distance between phases, more than 90% of ultra-high voltage transmission line faults are single-phase grounding short circuits, and more than 80% of them are transient faults. Therefore, the use of single-phase reclosing technology is of great significance for quickly restoring power supply and maintaining system stability. However, the current single-phase recloser is reclosed after a fixed time, and its action is blind; if it recloses on a permanent fault, it will bring a more serious impact to the pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/06
Inventor 索南加乐邵文权贠保记
Owner XIAN XIRUI CONTROL TECH CO LTD
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