Distribution network fault partition isolation method based on single-phase earth fault zero-sequence current disturbance

Abstract

The invention discloses a distribution network fault partition isolation method based on single-phase earth fault zero-sequence current disturbance, and the method comprises the steps: arranging a single-phase switch and a line selection resistor on a power distribution network arc suppression coil, and configuring a line selection device at the same time; a phase sequence and zero sequence integrated sensor is configured in a pole-mounted switch and / or a section switch of a feeder line of the power distribution network; when a single-phase earth fault occurs in the power distribution network, an arc suppression coil of the power distribution network is connected in parallel with a line selection resistor, and a fault line is determined by comparing zero-sequence current of each line; based on a phase sequence and zero sequence integrated sensor on a pole-mounted switch and / or a section switch of a fault line, reporting the magnitude and direction of a zero sequence current of a deployment position; and the line selection device receives zero-sequence information at a pole-mounted switch and / or a section switch in the fault line, determines the position where a single-phase earth fault occurs, and remotely commands the corresponding switch to act to realize fault isolation. According to the invention, fault positioning and fault isolation can be realized rapidly and accurately.

Description

technical field [0001] The invention belongs to the technical field of distribution network fault location, in particular to a distribution network fault partition isolation method based on single-phase grounding fault zero-sequence current disturbance. Background technique [0002] With the rapid development of social economy and the continuous increase of electricity load, the scale of distribution network has gradually expanded, which has increased the weak points in the distribution network, often causing single-phase grounding faults, resulting in reduced power reliability of users, and even leapfrog tripping. Expanding the scope of power outages, therefore, partition isolation of distribution network faults has become an inevitable trend in distribution network development. [0003] At present, the distribution network automation equipment cannot realize the ground fault location, and cannot meet the needs of zoning and grading line selection and tripping. Power outag...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a distribution network fault partition isolation method based on single-phase ground fault zero-sequence current disturbance to solve the problem of inaccurate fault location and cut-off range in the existing distribution network. oversized problem

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