A whole-line high-precision fault location method for single/double-circuit transmission lines

Abstract

A high-precision fault location method for the whole line of a single / double-circuit transmission line. Generally, faults in the middle section of long-distance transmission lines are often far away from the measurement device and there are many factors affecting the distance measurement, so the distance measurement accuracy of many existing distance measurement schemes is difficult to control. In this regard, the present invention calculates the voltage amplitude ratio at both ends of the fault line equivalent network by listing and deriving the proportional function of the distance from the fault point to the line end to the total length of the line, thereby realizing accurate distance measurement of transmission line faults . In addition, in order to broaden the application range of this fault location method, considering the difference in electrical characteristics between double-circuit lines and single-circuit lines, and starting from the equivalent transformation according to the network structure characteristics of double-circuit transmission lines, a method suitable for double-circuit transmission lines is proposed. Terminal voltage amplitude comparison ranging method. The invention has the advantages of simple distance measurement calculation, the distance measurement result is not affected by transition impedance, can realize high distance measurement accuracy on the whole line, has a wide application range, and can well solve the problem of insufficient distance measurement accuracy in the middle section of the transmission line.

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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