Single/double-circuit power-transmission-line whole-line high-precision fault range finding method

Abstract

A single/double-circuit power-transmission-line whole-line high-precision fault range finding method is disclosed. Range finding precision of many existing range finding schemes of a general long-distance power transmission line middle section fault is not easy to control because the fault is far away from a measurement apparatus and there are a plurality of range finding influence factors. In the invention, through listing a two-end calculation voltage amplitude ratio under a fault line equivalence network, a proportion function of a distance from a fault point to a line end in a whole length of the line is derived so as to realize accurate range finding to the power transmission line fault. In addition, in order to widen an application scope of the fault range finding method, through considering electrical characteristic differences of a double-circuit line and a single-circuit line, according to a network structure characteristic of a double-circuit power transmission line, and from an aspect of equivalent transformation, a terminal voltage amplitude comparison range finding method adapting to the double-circuit power transmission line is provided. By using the method, range finding operation is simple; a range finding result is not influenced by a transition impedance; a whole line range finding precision is high and a suitable scope is wide. A problem that power transmission line middle section range finding precision is poor can be well solved.

Description

technical field [0001] The invention belongs to the field of relay protection in electric power systems, and in particular relates to a high-precision fault distance measurement method for a single / double-circuit transmission line. Background technique [0002] Transmission lines are the key to long-distance, high-capacity power transmission. In power systems, transmission lines are the electrical components with the highest probability of failure. Quickly and accurately determine the fault location of the transmission line, which can facilitate troubleshooting, quickly restore power supply, and reduce economic losses. Therefore, research on transmission line fault location is of great significance to promote the safe and stable operation of power system. At present, there are many studies on fault location of transmission lines. There are mainly two types of transient traveling wave method based on fault transient traveling wave and fault analysis method based on power f...

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Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a single / double-circuit transmission line full-line high-precision fault location method, which mainly solves the following problems: 1), solves the problem of long-distance, large-capacity transmission line fault location, Realize full-line high-precision ranging of single / double-circuit transmission lines; 2), overcome the impact of the difference in electrical characteristics of single-circuit lines and double-circuit lines on distance measurement, and ensure that the algorithm works equally well in both single-circuit lines and double-circuit lines. It can accurately measure faults; 3), ensure high-precision distance measurement for faults in the middle section of the line, and solve the problem of insufficient distance measurement accuracy for faults in the middle section of the line in many existing ranging solutions; 4), save double-ended faults The advantages of the distance measurement method overcome the defect of complex operation of the fault analysis distance measurement method

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