Line interphase fault single-ended distance measurement method based on interphase fault location factor

A technology of inter-phase fault and single-ended ranging, which is applied in the fault location and other directions, and can solve the problems of inability to locate single-ended faults, high sampling rate requirements, and inability to meet application requirements.
CN104330705AActive Publication Date: 2015-02-04STATE GRID CORP OF CHINA +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2015-02-04

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Abstract

The invention discloses a line interphase fault single-ended distance measurement method based on an interphase fault location factor. The method includes firstly, calculating the ratio of fault impedance, from an electric transmission line protection mounting position to an interphase short-circuit fault point, to line impedance, from the electric transmission line protection mounting position to an electric transmission line protection setting range, to acquire the electric transmission line interphase fault location factor b; selecting a fault location default value as lfault, and sequentially calculating the absolute values of [Zc1th(gamma1lfault) / Zc1th(gamma1lset)]-b of points on an electric transmission line by means of progressive increase of a fixed step length delta l until the total length of the electric transmission line is calculated; selecting the distance between the point with the maximum absolute value of [Zc1th(gamma1lfault) / Zc1th(gamma1lset)]-b on the electric transmission line and the electric transmission line protection mounting position as the fault distance. The method has the advantages that influences of electric transmission line interphase short-circuit fault point voltage, transition resistance and load current on electric transmission line interphase short-circuit fault single-ended distance measurement accuracy are eliminated theoretically, and the method has high distance measurement accuracy and is particularly applicable to interphase short-circuit fault single-ended distance measurement of extra-high-voltage alternating-current electric transmission lines.
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Description

technical field

[0001] The invention relates to the technical field of electric power system relay protection, in particular to a single-end ranging method for line interphase faults based on interphase fault location factors. Background technique

[0002] According to the division of electrical quantity sources, fault location methods are mainly divided into double-ended location methods and single-ended location methods. The double-terminal ranging method uses the electrical quantities at both ends of the transmission line to locate faults. It needs to obtain the electrical quantities at the opposite end through the data transmission channel, which is highly dependent on the data transmission channel. UHV AC transmission lines are often long-distance transmission lines, and the laying of data transmission channels required for distance measurement requires a large amount of additional investment. Therefore, the single-end distance measurement method is more practical than ...

Claims

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