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Double-circuit hybrid power transmission line fault positioning method

A transmission line, fault location technology, applied in fault location, fault detection according to conductor type, measurement of electricity and other directions, can solve problems such as large positioning error, and achieve the effect of simple positioning principle

Active Publication Date: 2018-11-16
JIANGSU ELECTRIC POWER CO
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AI Technical Summary

Problems solved by technology

After the line structure changes, using a single line positioning method will inevitably produce a large positioning error, and the traditional method is no longer applicable

Method used

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  • Double-circuit hybrid power transmission line fault positioning method
  • Double-circuit hybrid power transmission line fault positioning method
  • Double-circuit hybrid power transmission line fault positioning method

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0033] Double-circuit hybrid transmission lines on the same pole such as figure 1 As shown, it includes loop I and loop II; both loop I and loop II include two sections α and β; the types of transmission lines in section α and section β are different; for example, section α adopts overhead Line, the β section adopts cable, and the cable can usually be buried underground with an insulating layer; vice versa;

[0034] The double-circuit hybrid transmission line on the same pole is connected between the M side and the N side of the station, and the connection point between the α section and the β section is P; the length of the α section line is l α , the impedance per unit length Z α , the line length of the β segment is l β , the impedance per unit length Z β , M side power supply E M , N-side power supply E N ;

[0035] When a short-circuit fault occurs ...

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Abstract

The invention provides a double-circuit hybrid power transmission line fault positioning method. A double-circuit hybrid power transmission line fault positioning method is firstly put forward, and afault positioning distance expression is given. The method only needs to acquire current data at each side of the double-circuit hybrid power transmission line, and known hybrid line basic parametersare used to realize solution of a fault position. The fault positioning method is excellent in precision, can overcome influences of transition resistance and operating mode changes and is applicableto a double-circuit hybrid power transmission line within 100 kilometers of a dense city.

Description

technical field [0001] The invention relates to the technical field of electric power system automation, in particular to a fault location method for transmission lines. Background technique [0002] The emergence of fault location devices has greatly reduced the labor intensity of power line inspection staff, and accurate fault location results are conducive to rapid repair of lines and timely restoration of power supply. With the increasing scale of the power grid, the transmission line structure has changed from the traditional single to more complex, mainly reflected in the same pole, multi-circuit, multi-branch, hybrid lines, etc. After the line structure changes, using a single line positioning method will inevitably produce a large positioning error, and the traditional method is no longer applicable. Therefore, it is necessary to study fault location methods for complex line structures. Contents of the invention [0003] The purpose of the present invention is to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 严慧李澄邵亮黄瑜王涛胡晓青严伟李欣哲张誉龄朱星雨
Owner JIANGSU ELECTRIC POWER CO
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