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Disconnection protection judgment method and device suitable for single-side power transmission line

A disconnection protection and transmission line technology, applied in emergency protection circuit devices, measuring devices, measuring electricity and other directions, can solve problems such as rapid judgment of single-phase disconnection faults in transmission lines, and achieve strong anti-interference ability and prevent fire effects.

Active Publication Date: 2020-08-25
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a disconnection protection judgment method and device suitable for single-side power transmission lines to solve the problem of fast judgment of single-phase disconnection faults of transmission lines

Method used

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  • Disconnection protection judgment method and device suitable for single-side power transmission line
  • Disconnection protection judgment method and device suitable for single-side power transmission line
  • Disconnection protection judgment method and device suitable for single-side power transmission line

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Experimental program
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Effect test

Embodiment 1

[0053] Such as figure 1 Shown is a schematic diagram of a disconnection protection judging method applicable to a single-side power transmission line according to Embodiment 1 of the present invention, including steps:

[0054] S10: Collect voltage, current and switch position information on both sides of the line;

[0055]S20: Carry out a disconnection fault judgment. When the following disconnection criteria are met at the same time and the set time is maintained, it is judged that a disconnection fault has occurred; the disconnection criterion includes:

[0056] (1) The three-phase line voltage on the power supply side is greater than the voltage rating;

[0057] (2) There is only one line voltage on the load side and the corresponding line voltage on the power supply side whose amplitude difference is smaller than the fixed value of the voltage difference and whose phase difference is smaller than the fixed value of the phase difference. This line voltage is called the no...

Embodiment 2

[0061] Another embodiment 2 of the present invention, on the basis of embodiment 1, further includes step S30 after step S20: when it is judged as a disconnection fault, further judge the disconnection phase, the specific method is: the normal line voltage correlation The two phases are normal phases, and the other phase is broken phase.

Embodiment 3

[0062] Another embodiment 3 of the present invention, on the basis of embodiment 1, further includes step S40 after step S20: when the line is judged to have a disconnection fault, immediately act and drive the circuit breaker to trip the power side circuit breaker to remove the fault.

[0063] Another embodiment 4 of the present invention, on the basis of embodiment 1, before step S20, also includes a step S11 of protection charging: when all charging conditions are met at the same time and the preset charging delay is maintained, the charging completion flag is set, Disconnection judgment is allowed only when the charging is complete flag is in the set state. The charging conditions include: (1) the switches on both sides are closed; (2) the corresponding line voltage amplitude difference on both sides is less than the voltage difference fixed value, and the phase angle difference is smaller than the phase difference fixed value; (3) the current difference on both sides flows...

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Abstract

The invention discloses a disconnection protection judgment method suitable for a single-side power transmission line. The disconnection protection judgment method comprises the steps that voltage, current and switch position information on the two sides of the line are collected; according to the change of line voltage amplitude phases on two sides of the line before and after line breaking, thesingle-phase line breaking fault is quickly identified by combining current and switch information. The invention further discloses a corresponding protection device. According to the scheme, judgmentcan be completed within 100 ms when wire breakage occurs; and the power supply can be cut off within 200 ms, the problem that the power transmission line breakage fault cannot be quickly judged is solved, and the method is suitable for the power transmission line with a single-side power supply in various environments, especially the operation environment where fire or electric shock accidents are easily caused by overhead line breakage in forest farms, grasslands, petrochemical engineering and the like.

Description

technical field [0001] The invention belongs to the technical field of electric power system protection and control, and relates to a quick judgment method and device for disconnection protection suitable for single-side power transmission lines. Background technique [0002] Due to mechanical external force, construction quality and aging, disconnection fault is a typical fault type of transmission line. The disconnection of overhead lines will lead to ground faults, which may easily lead to electric shocks or fires for people and animals; large industrial enterprises often use cable lines for power transmission, and when a disconnection occurs, it will also cause great harm to electrical equipment such as motors. Therefore, It is very necessary to quickly identify and eliminate disconnection faults. Especially in the overhead lines of forest farms, grasslands and chemical enterprises, if the power supply can be cut off after the line breaks and before the line lands, the ...

Claims

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Application Information

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IPC IPC(8): G01R31/08H02H7/28
CPCG01R31/083G01R31/088H02H7/28
Inventor 王栎涛侯炜陈俊石勇倪群辉董凯达季炳伟徐彬
Owner NR ELECTRIC CO LTD
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