Precisely Positioning method and device for power transmission line fault using multiple terminal signals

Abstract

The multiple-terminal signal process of positioning fault in power transmission line includes the following steps: realizing sync sampling of multiple-terminal voltage and current signals of power transmission line with GPS; recording and exchanging the electric quantities before and after fault to obtain required data for positioning fault; obtaining the accurate position of the fault point via judging the sort of the fault and precise positioning. The fault positioning device for power transmission line includes voltage converter, current converter, GPS signal receiver board, data acquisition card and industrial control computer. The present invention can position fault in power transmission line precisely and in high robustness.

Description

technical field [0001] The invention relates to a transmission line fault location method and device using multi-terminal signals, belonging to the technical field of transmission equipment. Background technique [0002] Transmission line fault location is an important measure to ensure the safe and economical operation of the power grid, and it is a research difficulty and hotspot in the field of power systems. The existing fault location methods are divided in principle, mainly including traveling wave method and fault analysis method. [0003] At present, most of the fault location modules on the fault recording devices produced by domestic and foreign power equipment companies use unilateral current and voltage signals, and the mathematical model used is an algebraic equation describing the steady-state process, which has defects in principle and cannot eliminate the transition resistance. Therefore, the existing fault analysis and location methods are deficient in prin...

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Problems solved by technology

[0003] At present, most of the fault location modules on the fault recording devices produced by domestic and foreign power equipment companies use unilateral current and voltage signals, and the mathematical model used is an algebraic equation describing the steady-state process, which has defects in principle and cannot eliminate the transition resistance. and the influence of the boosting current of the end system, it is impossible to accurately describe the transient process behavior of the electrical quantity during the fault. Therefore, the existing fault analysis and positioning methods have theoretical deficiencies. Due to the influence of various factors, the positioning error is relatively large.

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