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Double-loop fault ranging method and apparatus based on distributed parameter model

A distributed parameter model, fault location technology, applied in the measurement device, fault location, measurement power and other directions

Inactive Publication Date: 2018-10-02
国网江苏省电力有限公司宜兴市供电分公司
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  • Claims
  • Application Information

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Problems solved by technology

Most of the existing double-terminal fault location devices use the centralized parameter model of the line, which can only be applied to short-distance lines within 100 kilometers

Method used

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  • Double-loop fault ranging method and apparatus based on distributed parameter model
  • Double-loop fault ranging method and apparatus based on distributed parameter model
  • Double-loop fault ranging method and apparatus based on distributed parameter model

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Embodiment Construction

[0061] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0062] As the first aspect of the present invention, there is provided a double-circuit line fault location method based on a distributed parameter model, wherein the double-circuit lines I and II are connected between the plant stations M and N, and the line between M and N The length distance is set as L, and the distance between the fault point and the M side is set as d, such as figure 1 As shown, the described double-circuit fault location method based on the distributed parameter model includes:

[0063] S110, collecting the busbar voltage U on both sides of the faulty line M and U N And collect the current data I of the line protection device correspon...

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Abstract

The invention relates to the technical field of power system automation and particularly discloses a double-loop fault ranging method based on a distributed parameter model. The method comprises: busvoltages UM and UN at two sides of a fault line and current data II M , III M, II N and III N of a line protection device are collected; current fault components deltaII M, deltaIII M, deltaII N and deltaIII N corresponding to the current data II M, III M, II N and III N of the line protection device as well as respectively corresponding positive sequence, negative sequence and zero sequence components are calculated respectively; voltage fault components deltaUM and deltaUN corresponding to the bus voltages UM and UN at the two sides of the fault line as well as respectively corresponding positive sequence, negative sequence and zero sequence components are calculated respectively; a fault ranging equation general formula needed by a fault distance ratio d / L is solved and a fault distanceratio d / L is calculated; and the fault distance ratio d / L is outputted. In addition, the invention also discloses a double-loop fault ranging apparatus based on a distributed parameter model. With the ranging method, ranging of a fault point is realized under the circumstance that line parameters are unknown.

Description

technical field [0001] The invention relates to the technical field of electric power system automation, in particular to a method for measuring fault distance of a double circuit line based on a distributed parameter model and a fault distance measuring device for a double circuit line based on a model of a distributed parameter. Background technique [0002] Nowadays, traveling wave distance measuring devices will encounter problems such as traveling wave dispersion and signal extraction reliability in the application process. The research on the principle of fault distance measurement based on fault analysis method is still a hot spot in the field of electric power engineering. Most of the existing double-terminal fault location devices use the centralized parameter model of the line, which can only be applied to short-distance lines within 100 kilometers. For long-distance transmission lines, the centralized parameter model will no longer be applicable, and the influence...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 周微平李澄邵亮严慧王涛李欣哲张誉龄
Owner 国网江苏省电力有限公司宜兴市供电分公司
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