Using the characteristics of the real part of the voltage drop to realize the single-end distance measurement method of the phase-to-phase fault of the line

A technology for phase-to-phase fault and single-ended ranging, which is applied in the direction of the fault location, etc., can solve the problems of deviation of the measurement result from the real fault distance, the impact of fault ranging accuracy, and high sampling rate requirements, and achieve easy program implementation and fast ranging speed , The effect of simple ranging principle
CN103245876BActive Publication Date: 2015-08-26STATE GRID CORP OF CHINA +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2015-08-26

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Abstract

The invention discloses a method for realizing line interphase fault single-ended distance measurement by means of real part characteristics of voltage drop. According to the method, a voltage phase angle at an interphase short fault point is calculated by using fault interphase negative sequence voltage and positive sequence impedance of an electric transmission line per unit length, so that an additional fault distance generated due to transition resistance is calculated, and the fault distance from the electric transmission line protection installation position to the interphase short fault point is obtained by subtracting the additional fault distance generated due to transition resistance from the real part of a ratio of the fault interphase voltage to the voltage drop of the electric transmission line per unit length. The method solves the problem that the transition resistance and load current influence the accuracy of single-ended fault distance measurement; and when a high resistance short fault between phases of the electric transmission line happens, the method has high distance measurement accuracy, the distance measurement principle is simple, the procedure is easy to implement, the fault distance can be directly calculated without a search algorithm, the distance measurement speed is high, and the real-time performance is high.
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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 distance measuring method for phase-to-phase faults of lines by using the characteristics of the real part of voltage drop. Background technique

[0002] The single-end fault location method of transmission lines only uses the electrical quantity at one end of the transmission line for fault location, does not require communication and data synchronization equipment, has low operating costs and stable algorithms, and has been widely used in transmission lines. Single-ended fault location methods for transmission lines are mainly divided into traveling wave method and impedance method. The traveling wave method utilizes the transmission properties of fault transient traveling waves to perform single-ended fault location. It has high precision and is not affected by the operation mode and excessive resistance. However, it requires a high ...

Claims

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