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A comprehensive single-ended fault location method for distribution network lines

A technology for fault location and distribution network, which is applied in the direction of fault location and fault detection by using pulse reflection method, which can solve problems such as difficult identification of reflected waves, and achieve the effect of improving reliability, accuracy and good reliability

Active Publication Date: 2018-03-20
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the existing distribution network transmission line fault location method, aiming at the difficult problem of reflected wave identification in single-end traveling wave distance measurement, to provide a comprehensive single-end fault location method suitable for distribution network lines

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  • A comprehensive single-ended fault location method for distribution network lines
  • A comprehensive single-ended fault location method for distribution network lines
  • A comprehensive single-ended fault location method for distribution network lines

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Embodiment Construction

[0043] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0044] The invention provides a comprehensive single-end fault location method for distribution network lines. Firstly, the initial fault distance is calculated by the frequency domain method, and secondly, the transition resistance is calculated by using the initial fault distance. Identification, and finally complete the precise fault location of distribution network lines. Its flow chart is as figure 1 As shown, the specific steps are as follows:

[0045] Step 1: Phase transformation. When the distribution network line is faulty, the three-phase voltage and the three-phase voltage after the distribution network fault are extracted. If it is an asymmetrical fault, in order to eliminate the influence of the mode mixing phenomenon, the three-phase current needs to be transformed into a line modulus for analysis. . U...

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Abstract

The invention relates to a comprehensive single-end fault positioning method applicable to power distribution network lines. The comprehensive single-end fault positioning method comprises the following steps: firstly, extracting intrinsic frequency of transient state traveling waves by using a signal marginal spectrum, calculating by using a frequency domain method so as to obtain initial fault distance, estimating transition resistance according to the initial fault distance and power frequency, and confirming a reflection wave recognition time window and reflection wave polarity according to the estimation result of the initial fault distance and the transition resistance, thereby realizing reliable reflection wave recognition and finally completing precise single-end fault positioning on the power distribution network lines on the basis. By adopting the method, an impedance method, a frequency domain method and a traveling wave method are fused, the position of a fault point of the power distribution network lines is precisely confirmed, and the reliability and the precision in positioning faults of the power distribution network are improved.

Description

technical field [0001] The invention relates to a method for judging the exact location of a fault point in a transmission line of a distribution network, in particular to a comprehensive single-end fault location method suitable for a distribution network line. Background technique [0002] Since the 1990s, the transmission line fault location device based on the traveling wave principle (also known as the traveling wave fault location device) has basically matured in technology and has been widely used in the power system. Years of actual operation experience show that it has a high The accuracy and reliability of ranging, while the research on applying it to the precise positioning of distribution network is in its infancy. At present, in the field of distribution network fault location, the main research direction is fault section location, which can be divided into two categories according to different principles: active fault location and passive fault location. [00...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/11
Inventor 王吉文肖拥东国伟辉姚庭镜曲鸿春郭宁明
Owner STATE GRID CORP OF CHINA
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