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Double-terminal fault location method based on longitudinal impedance

A technology of fault location and longitudinal impedance, applied in directions such as the fault location, which can solve the problems of complex calculation process, influence of line parameter changes in distance measurement results, influence of line length, etc.

Inactive Publication Date: 2015-11-18
XI'AN POLYTECHNIC UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method based on longitudinal impedance double-terminal fault distance measurement, to achieve accurate and rapid fault location of high-voltage transmission lines, and to effectively overcome the complex calculation process of traditional double-terminal fault distance measurement methods, and the distance measurement results are affected. The influence of system impedance and line parameter changes and the problems that are obviously affected by the length of the line

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  • Double-terminal fault location method based on longitudinal impedance
  • Double-terminal fault location method based on longitudinal impedance
  • Double-terminal fault location method based on longitudinal impedance

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Embodiment Construction

[0114] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0115] A kind of double-terminal measurement fault location method based on longitudinal impedance of the present invention, specifically implement according to the following steps:

[0116] Step 1, obtain the equivalent line model of the dual power supply system after failure and normal operation;

[0117] Step 1.1, the actual operating system after the fault is equivalent to the dual power supply system model after the fault according to the Thevenin equivalent principle, such as figure 1 .

[0118] In step 1.2, idealize the three-phase transmission line model of the dual power supply system obtained in step 1.1 into a single-phase line, and then obtain the R-L single-phase equivalent fault component line model after the fault according to the superposition principle, as shown in figure 2 ;

[0119] In step 1.3, the dual power supply sy...

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Abstract

The invention discloses a double-terminal fault location method based on longitudinal impedance. The method comprises the following steps of (1) acquiring the equivalent line models of a dual power supply system in a faulty condition and in a normal running condition; (2) deriving the analytical expression of a fault distance d; (3) performing parameter calculation; and (4) making each parameter calculated in the step 3 substituted into the expression of the fault distance d for fault location. High tension transmission line faults can be accurately and rapidly located. Problems that a conventional double-terminal fault location method entails a complex calculation process; and the location result is affected by system impedance and line parameter changes and further obviously influenced by line lengths are effectively overcome.

Description

technical field [0001] The invention belongs to the field of relay protection of AC transmission lines, and relates to a method for measuring fault distance by double-terminal measurement. Background technique [0002] Accurate fault location of transmission lines can greatly shorten the inspection time of maintenance personnel, which is conducive to quickly finding fault points and timely troubleshooting, which is of great significance to the safe, stable and economical operation of power systems. [0003] At present, the fault location method can be divided into traveling wave method, fault analysis method and intelligent distance measurement method according to its working principle; from the required information source, it can be divided into single-ended measurement method and double-ended measurement method. According to the data synchronization requirements of the double-ended measurement method, the double-ended measurement method can be divided into two types: metho...

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Application Information

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IPC IPC(8): G01R31/08
Inventor 夏经德张向聪黄新波
Owner XI'AN POLYTECHNIC UNIVERSITY
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