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Single-end holographic frequency domain fault positioning method for high-voltage transmission line

A technology for high-voltage transmission lines and fault location, which is applied to fault locations, detects faults by conductor type, and measures electricity. status, etc.

Active Publication Date: 2017-08-18
STATE GRID GASU ELECTRIC POWER RES INST +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Summarize the existing algorithms for single-ended electrical quantities. The common problem is that the distance measurement equation does not meet the definite solution conditions due to the unknown system impedance and transition resistance at the opposite end, and the fault location has to be realized by assuming supplementary conditions. It cannot be applied to the ever-changing operating state of the power grid, resulting in systematic errors
This is the fundamental reason why the distance measurement results of the existing single-ended fault location method are not accurate enough to meet the requirements of engineering applications

Method used

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  • Single-end holographic frequency domain fault positioning method for high-voltage transmission line
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  • Single-end holographic frequency domain fault positioning method for high-voltage transmission line

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Embodiment Construction

[0099] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0100] The present invention is a new method for fault location of high-voltage transmission lines based on the principle of parameter identification under the condition of intelligent substation. Based on the rich transient information provided by the type transformer, the principle of parameter identification is used for fault location of transmission lines.

[0101] The basic idea of ​​the method for parameter identification and distance measurement proposed by the present invention is to eliminate the fault point current, opposite-end current and voltage in the equation on the basis of obtaining the fault network equation and the fault point boundary condition equation, and obtain the current and voltage including the local current and voltage , the network equation of the opposite side system impedance, the fault point transition resistance and the fault...

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Abstract

The invention discloses a single-end holographic frequency domain fault positioning method for a high-voltage transmission line. Starting from a fault component network equation, opposite-end system impedance, transition resistance and a fault distance are set to be undetermined parameters, a network equation in the frequency domain under a lumped parameter model is given, and system parameters and the positioning information are obtained through solution. The method eliminates systematic errors in single-end range measurement from the principle, and the range measurement precision is improved.

Description

technical field [0001] The invention relates to the technical field of relay protection for power system transmission lines, in particular to a single-end holographic frequency-domain fault location method for high-voltage transmission lines. Background technique [0002] The UHV transmission network has a huge transmission capacity, and the repair of line faults plays an extremely important role in the operation reliability of the power grid. The rapid repair of line faults depends on accurate fault location. my country's land resources are poor, the corridors of hydropower outgoing lines have complex topography, and the line inspection equipment is simple, which makes the accuracy of fault location even more important. [0003] Summarize the existing algorithms for single-ended electrical quantities. The common problem is that the distance measurement equation does not meet the definite solution conditions due to the unknown system impedance and transition resistance at th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088Y04S10/52
Inventor 姚旭康小宁程蓉智勇崔力心倪赛赛陈新赵杰拜润卿赵毅王春光梅姚张坤贤张大伟郭文科王永年刘巍
Owner STATE GRID GASU ELECTRIC POWER RES INST
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