Distribution network single-phase grounding fault line automatic selection and judgment method

Abstract

The invention relates to a distribution network single-phase grounding fault line automatic selection and judgment method. With the method adopted, the defects in the prior art can be solved. According to the technical schemes of the method, a circuit zero line current protection device and a bus-bar grounding signal device which are arranged in a plant station, and a scheduling background which is arranged in a master station are adopted, wherein the circuit zero line current protection device and the bus-bar grounding signal device are both in communication connection with the scheduling background. The method includes the following steps that: step 1, the circuit zero line current protection device is awaited to act, single-phase grounding fault signals are sent to the scheduling background; step 2, the scheduling background judges whether grounding reset is required to be performed, if an instantaneous fault occurs, the instantaneous fault is directly recorded, and then, the current step is terminated, the method shifts to step 1, and the step 1 is performed, if a permanent fault occurs, step 3 is executed; and step 3, a regulator performs trial switching on, if a line is selected, and the trial switching on succeeds, the permanent fault is recorded, processing is performed, and then the method shifts to the step 1, and the step 1 is performed, if the line is selected, the trial switching on fails, the regulator performs trial switching on according to a sequence table.

Description

technical field [0001] This patent relates to the technical field of electrical safety, in particular to an automatic selection and judgment method for a single-phase ground fault line in a distribution network. Background technique [0002] More than 80% of the line faults in the small current grounding system are single-phase grounding faults or caused by them. Since the line voltage is still symmetrical when the single-phase grounding Grounding line selection device, but the accuracy of line selection is not high according to the operation experience. In the end, manual test pulling is mostly used to select the criterion. According to the small-scale statistics, there are about 5 lines for each test pull, which leads to the increase of the short-term time of many users due to the test pull. Power outage, with the increase of 10kV outgoing cables, the single-phase grounding fault current increases significantly and easily develops into a phase-to-phase grounding short circ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the current grounding line selection cannot be accurately selected and judged in the above-mentioned prior art, and many of them return to the problem of manual trial and judgment, and provide an automatic selection and judgment method for single-phase grounding fault lines in the distribution network

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