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Electric-power system transmitting-line fault diagnosis and phase selecting method

A transmission line and fault diagnosis technology, applied in the direction of fault location, etc., can solve problems such as inability to distinguish between oscillation and fault, fault phase judgment and misjudgment

Inactive Publication Date: 2004-09-15
WUHAN UNIV
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AI Technical Summary

Problems solved by technology

[0002] How to distinguish the fault and oscillation on the power transmission line of the power system and judge the fault phase is a problem that must be solved for the operation and control of the power system. Correctly distinguishing the fault and oscillation and judging the fault phase can improve the safe and stable operation level of the power system It is of great significance. The existing fault phase selection methods for transmission lines cannot distinguish between oscillations and faults on the transmission line of the power system, and there are misjudgments when performing fault phase judgment.

Method used

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  • Electric-power system transmitting-line fault diagnosis and phase selecting method
  • Electric-power system transmitting-line fault diagnosis and phase selecting method
  • Electric-power system transmitting-line fault diagnosis and phase selecting method

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Embodiment Construction

[0040] The present invention includes the following parts:

[0041] 1. Data collection part

[0042] 1) The voltage and current signals on the secondary side of the transmission line are transformed into a low level that can be collected and measured by voltage and current transducers, and are acquired by digital-to-analog conversion (A / D or V / F conversion) and sampling card collection Digital signals that can be processed by a computer;

[0043] 2) The GPS signal receiving module is used in the bit device to obtain the second pulse with an error of less than 50nS, and the collected electrical quantity is time stamped and stored in the memory.

[0044] 3) According to the current and voltage digital signals collected by the sampling card, judge whether the line is faulty. If the line is not faulty, repeat the above process; if there is a fault, record and save the electrical quantity before and after the fault to the hard disk to obtain the fault location. Data is needed; the prop...

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Abstract

The method includes following steps: collecting data in order to obtain signals of voltage and current at multiple ends of tested wires; recording and exchanging electrical data before and after fault in order to obtain needed data to locate position of fault; distinguishing defective phase. Comparing with prior art, the invented method solves issue existed for long time: distinguishing between fault and oscillation correctly; determining defective phase; discriminating whether fault happened within section or out of section. Thus, the invention raises level of running electric power system safely and stably.

Description

Technical field [0001] The invention relates to a method for fault diagnosis and phase selection of a power system transmission line, and belongs to the technical field of power transmission equipment. Background technique [0002] How to distinguish the fault and oscillation on the power system transmission line and determine the fault phase is a problem that must be solved in the operation and control of the power system. Correctly distinguish the fault and oscillation and determine the fault phase to improve the safe and stable operation of the power system. It is of great significance. The existing transmission line fault phase selection method cannot distinguish between the oscillation and the fault that occur on the power system transmission line, and there is a misjudgment when the fault phase is judged. Summary of the invention [0003] In order to solve the above-mentioned problems, the present invention proposes a method for power system transmission line fault diagnos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 龚庆武陈允平
Owner WUHAN UNIV
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