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Single-end holographic frequency domain fault location method for high-voltage transmission lines

A high-voltage transmission line and fault location technology, which is applied to the fault location, fault detection according to the conductor type, and electrical measurement. It can solve problems such as systematic errors, inapplicability to the ever-changing operating status of the power grid, and inaccurate ranging results.

Active Publication Date: 2019-10-25
STATE GRID GASU ELECTRIC POWER RES INST +3
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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 location method for high-voltage transmission lines
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  • Single-end holographic frequency domain fault location method for high-voltage transmission lines

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Embodiment Construction

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

[0100] The present invention is a new method for fault location of high voltage transmission line based on the principle of parameter identification under the condition of intelligent substation. Its main purpose is to solve the problem of systematic errors in the traditional single-ended fault location method. The rich transient information provided by the type transformer uses the principle of parameter identification for fault location of transmission lines.

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

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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, and in particular to a single-ended holographic frequency domain fault location method for high-voltage transmission lines. Background technique [0002] The transmission capacity of the UHV transmission network is huge, and the repair of line faults plays an extremely important role in the reliability of the power grid. The rapid repair of line faults depends on accurate fault location. my country's land resources are scarce, the terrain of the hydropower outgoing line corridor is complicated, and the line inspection equipment is simple, making the accuracy of fault location more important. [0003] Summarizing the various algorithms of existing single-ended electrical quantities, the common problem is that the ranging equation caused by the unknown system impedance and transition resistance at the opposite end does not meet the definite solution conditions,...

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Application Information

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Patent Type & Authority Patents(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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