Low current grounding system distribution circuit single-phase earth fault automatic position setting method

Abstract

The invention relates to a distribution circuit single-phase earth fault automatic locating method, which comprises: (1) by allocating a route selection core which includes the monitoring of earth fault, the instilling of diagnosis signals, the detection of diagnosis signals and a communicating module in a distribution substation, the system is judged whether a single-phase earth fault happens; the diagnosis signals are instilled to the system automatically in the fault condition; the biggest feeder line of the diagnosis signals is detected to be an earth circuit line; the route selecting result is transmitted to an error locating computer by a communicating network. (2) A signal detector is arranged along the distribution circuit line to detect whether a diagnosis signal exists in a first order system and the detecting result is sent to the error locating computer by the communicating networks. (3) The error locating computer is installed in a dispatching center to communicate with the signal detectors on feeder lines and each route selection core in the jurisdiction, and determine automatically the sections of a single-phase earth fault by using error locating software. The distribution circuit single-phase earth fault automatic locating method has the advantages of high degree of automation, short location time and high location accuracy, etc.

Description

technical field [0001] The invention relates to a method for detecting a grounding fault of a power distribution line, in particular to a method for automatically locating a single-phase grounding fault of a power distribution line of a small current grounding system. Background technique [0002] At present, the detection of single-phase ground fault in small current grounding system mainly includes ground fault line selection and ground fault location. In recent years, there have been many researches on line selection technology at home and abroad, and a variety of different line selection principles have been developed, which has significantly improved the input rate of line selection devices and the accuracy of line selection results in actual power distribution systems, and played a role better effect. As for the location of single-phase ground faults in low-current grounding systems, although there are some researches at home and abroad, and some theoretical methods h...

AI Technical Summary

Problems solved by technology

However, the S-injection method requires the operator to manually inspect the line with a hand-held positioning detector. The degree of automation is low and the positioning time is long. A second fault may occur during the fault location process, causing a short-circuit fault with serious consequences. In severe weather conditions Or in a complex line environment, the manual line hunting method cannot be applied to the site in time

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