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A Fault Location Method and System Based on Positive Sequence Voltage Distribution Characteristics

A positive-sequence voltage and fault location technology, applied in the fault location, detecting faults according to conductor type, measuring electricity, etc., can solve the problems of distance measurement result error, low voltage curve steepness, etc., to reduce the range of positioning error, and the characteristics are obvious. , Overcome the effect of large errors

Active Publication Date: 2021-07-27
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a fault location method and system based on the distribution characteristics of positive sequence voltage. Technical problems that lead to large errors in ranging results

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  • A Fault Location Method and System Based on Positive Sequence Voltage Distribution Characteristics

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[0059] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but 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 conflict with each other.

[0060] like figure 1 As shown, an embodiment of the present invention provides a fault location method based on positive sequence voltage distribution characteristics, including:

[0061] S1. Perform real-time detection on the distribution network, and extract the positive sequence voltage, positive sequence current, line impedance and admittance parameters at both ends of the line at the time of t...

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Abstract

The invention discloses a fault location method and system based on positive sequence voltage distribution characteristics, belonging to the field of distribution network fault location. The method includes: detecting the distribution network in real time, extracting the positive sequence voltage, positive sequence current, line impedance and admittance parameters at both ends of the line at the time of the fault; taking the two ends of the faulty line as starting points respectively, deducing the positive sequence voltage distribution along the faulty line And determine the initial fault location interval; use the above positive sequence voltage distribution along the line to construct the difference voltage distribution with the two ends of the fault line as the starting point; according to the slope of the positive sequence voltage distribution curve along the line, the initial fault location interval and the difference voltage distribution curve The slope is used to obtain the final fault location interval. The present invention overcomes the problem of relatively large errors in the distance measurement results due to the low steepness of the voltage curve when a fault occurs under working conditions such as a small line length coefficient and a short line length of the distribution feeder line, and effectively improves the double-terminal fault measurement. Positioning reliability and accuracy.

Description

technical field [0001] The invention belongs to the technical field of distribution network fault location, and more particularly, relates to a fault location method and system based on positive sequence voltage distribution characteristics. Background technique [0002] With the development and progress of our society, safe and reliable power supply has become an important link related to national life and industrial production. At the same time, the economic losses and negative impacts caused by power outages are becoming more and more obvious, and the demand for continuous supply and distribution of high-quality power is becoming more and more urgent. As a basic part of the distribution network, transmission lines have a very high incidence of line failures due to a wide range of distribution, long-term exposure to the natural environment, line aging, man-made damage and other factors. Therefore, it is very important to accurately and quickly find the fault location and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 陈卫袁智勇白宇于力陈睿徐全尹项根
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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