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

A transmission line and fault location technology, applied in fault location, information technology support system, etc., can solve the problem of inability to eliminate the influence of transition resistance and booster current of the end system, large positioning error, and inability to accurately describe the fault transient process behavior And other issues

Inactive Publication Date: 2004-02-11
WUHAN UNIV
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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 resistanc

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

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Embodiment Construction

[0045] The present invention comprises following parts: one, data acquisition part

[0046] 1) The voltage and current signals on the secondary side of the transmission line are converted into a low level that can be collected and measured by the voltage and current transmitters, and obtained by digital-to-analog conversion (A / D or V / F conversion) and sampling card Digital signals that computers can process;

[0047] 2) Use the GPS signal receiving module in the positioning device to obtain a second pulse with an error of less than 50 nS, and mark the time stamp on the collected electrical quantity;

[0048] 3) According to the current and voltage digital signals collected by the sampling card, judge whether there is a fault in the line. If there is no fault in the line, repeat the above process; if a fault occurs, record and save the electrical quantity before and after the fault to the hard disk to obtain the fault location The data is required; to judge the occurrence of t...

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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...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCY04S10/522Y04S10/52
Inventor 陈允平龚庆武舒乃秋龙志君张承学胡志坚
Owner WUHAN UNIV
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