Method for differentiating fault properties of same-rod double-circuit line with paralleling reactor

A loop fault and identification method technology, applied in the fault location, instrument, measuring electricity and other directions, can solve the problems of long coincidence time, unfavorable fault arc extinguishing, inability to quickly and effectively judge the fault type, etc. strong effect

Inactive Publication Date: 2014-07-30
ZHEJIANG UNIV
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Problems solved by technology

At present, the double circuit line on the same pole mainly adopts the method of distinguishing the fault nature of the single circuit line and reclosing according to the

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  • Method for differentiating fault properties of same-rod double-circuit line with paralleling reactor
  • Method for differentiating fault properties of same-rod double-circuit line with paralleling reactor
  • Method for differentiating fault properties of same-rod double-circuit line with paralleling reactor

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Embodiment Construction

[0022] In double-circuit transmission lines on the same pole with shunt reactors, the fault phase terminal voltage has different fault characteristics under different fault properties. If only the single-phase adaptive reclosing principle is used, the fault nature cannot be judged. The research and analysis found that: 1) In case of a ground fault, the nature of the ground fault is judged by using the integral value of the phase terminal voltage when the fault is disconnected: Among them: u Ii (t), u IIj (t) is the sampling value of the terminal voltage of the faulty phase of the two circuits, x is the starting time of the integration, T 0 The power frequency period is 20ms, S Ii_1 , S IIj_1 They are the integral values ​​of the I and II loops with x as the initial integration time; in order to prevent misjudgment caused by the selection of the integral initial time, the method of taking the maximum value of the second integral is adopted, and the second integral initial t...

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Abstract

The invention relates to a method for differentiating the fault properties of a same-rod double-circuit line with a paralleling reactor. According to an existing same-rod double-circuit line self-adaption reclosure scheme, the fault properties of all faults can not be differentiated and an adopted fault property differentiating principle requires long time. According to the method, the voltage of a disconnected phase recovery terminal is integrated within a power frequency period, so that the property of the ground fault is differentiated; the voltage difference of the synonym overline fault phase recovery terminal is integrated, so that the property of a synonym overline fault is differentiated; meanwhile, with the combination of the reclosing time sequence, the properties of the inter-phase and synonym overline faults are differentiated. According to the method, sensitivity is high, an adopted data window is short, and the method is suitable for various possible faults in the same-rod double-circuit line with the paralleling reactor.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a method for discriminating the nature of faults of all fault types on double-circuit lines on the same pole with shunt reactors. Background technique [0002] Due to the advantages of narrow outlet corridor, large transmission capacity, improved power supply reliability, and simple operation and maintenance, double-circuit lines on the same pole can well adapt to the development requirements of modern power grids, thus making double-circuit lines or multi-circuit lines on the same pole Erecting has become an inevitable development trend. Usually, line faults are mostly instantaneous. In order to restore the power supply capacity as soon as possible, adaptive reclosing should be used; in order to ensure the accuracy of reclosing action and avoid secondary shocks to the system, it is necessary to judge the nature of the fault in advance. At present, the...

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Application Information

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IPC IPC(8): G01R31/02G01R31/08
Inventor 王慧芳林达王庆庆
Owner ZHEJIANG UNIV
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