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Fault positioning method and device based on voltage fault component distribution characteristics

A technology of current fault component and voltage distribution, applied in fault location, measuring device, measuring electrical variables, etc., can solve the problems of inconspicuous voltage characteristics of short and medium length lines, deviation of double-end ranging results, etc., to improve fault location accuracy Effect

Active Publication Date: 2020-07-14
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the defects and improvement needs of the prior art, the present invention provides a fault location method and device based on the distribution characteristics of voltage fault components. There is a large deviation in the fault location

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  • Fault positioning method and device based on voltage fault component distribution characteristics
  • Fault positioning method and device based on voltage fault component distribution characteristics
  • Fault positioning method and device based on voltage fault component distribution characteristics

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Embodiment Construction

[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0039] One aspect of the present invention provides a fault location method based on the distribution characteristics of voltage fault components, such as figure 1 As shown, it specifically includes the following steps:

[0040] S1: According to the voltage and current fault components measured at both ends of the line at the time of the fault, combined with the impedance and admittance paramet...

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Abstract

The invention discloses a fault positioning method and device based on voltage fault component distribution characteristics. The method comprises the steps of S1, obtaining a voltage distribution curve along a line according to voltage and current fault components measured at two ends of a line at a fault moment through combining with a line impedance admittance parameter, S2, obtaining an initialfault positioning interval based on the voltage distribution curve, S3, performing difference calculation on the double-end fault components, and constructing a difference voltage distribution curve,and S4, combining the voltage distribution curve slope determined in the step S2, the initial fault positioning interval and the difference voltage distribution curve slope determined in the step S3to obtain an optimized fault positioning interval. The method can effectively solve a problem that a larger positioning interval exists because the length of a line is shorter and the steepness of a voltage fault component distribution curve is lower, thereby improving the fault positioning precision.

Description

technical field [0001] The invention belongs to the field of distribution network fault location technology, and more specifically relates to a fault location method and device based on distribution characteristics of voltage fault components. Background technique [0002] With the continuous improvement of economic development and social demand, users' requirements for power supply quality are also continuously improved. During the actual operation of the power grid, it is affected to varying degrees by the operation mode, harsh environment, self-aging, etc., and the line is very prone to failure. However, the distribution network widely distributed in cities in my country has the characteristics of many branches, large power supply, and complex network structure. Therefore, the probability of line faults is extremely high. Affect the reliability and stability of power grid power supply. [0003] At present, the methods of transmission line fault location are mainly resear...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 陈卫秦瑜陈德树白宇
Owner HUAZHONG UNIV OF SCI & TECH
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