Cable and overhead line mixed line double-end traveling wave fault location algorithm based on piecewise compensation principle

Abstract

The invention discloses a cable and overhead line mixed line double-end traveling wave fault location algorithm based on the piecewise compensation principle. According to the cable and overhead line mixed line double-end traveling wave fault location algorithm, the difference between the time when a fault initial traveling wave surge reaches a measuring point on one side of a line and the time when the fault initial traveling wave surge reaches a measuring point on the other side of the line is compared with the difference between the time when traveling wave propagation at each connecting point of the mixed line reaches the measuring point on one side of the line and the time when the traveling wave propagation at each connecting point of the mixed line reaches the measuring point on the other side of the line to determine a fault section, and then time and distance compensation is conducted to express the fault distance as the sum of the distance from the endpoint of the fault section to the measuring point and the vector distance from the fault point to the endpoint. Compared with an existing mixed line traveling wave fault location method, the cable and overhead line mixed line double-end traveling wave fault location algorithm is higher in adaptability, clearer in concept, easier to implement, and unified with a traditional uniform transmission line two-end fault location algorithm in form and physical meaning.

Description

technical field [0001] The invention relates to the technical field of protection and control of a distribution network and the technical field of line fault detection, in particular to a method for measuring traveling wave fault distance of an overhead wire and cable hybrid line. Background technique [0002] The traveling wave fault location technology mainly utilizes the voltage and current traveling wave signals generated during the fault, according to the time difference between the traveling wave between the measurement point and the fault point (single-ended method) or the time difference between the initial traveling wave arriving at both ends of the line (double-ended method) to measure the fault distance. It is not affected by factors such as fault type, fault point transition resistance, voltage transformer (TV) and current transformer (TA) transmission error, etc. It has obvious technical advantages. After more than ten years of development, traveling wave faul...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of complex traveling wave fault location algorithm and large error of multi-section hybrid line, and provide a double-terminal traveling wave fault location algorithm based on the principle of segment compensation for cable overhead line hybrid line

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