A single-phase-to-ground fault location device and method for distribution network based on edge computing

Abstract

The invention provides a power distribution network single-phase earth fault positioning device and method based on edge calculation. The device comprises: a positioning calculation module which is arranged in the automatic main station of the power distribution network and measuring points which are distributed in the whole network; each measuring point is provided with a measuring device; and each measuring device comprises a three-phase acquisition module installed on a power transmission line and a convergence module installed on a telegraph pole. The three-phase acquisition modules realize synchronization of each measurement point through Beidou / GPS time service. Current waveforms are synchronously collected in real time, wave recording data are stored locally, when a single-phase earth fault occurs, edge calculation is executed locally to process the fault waveforms, wave heads of the fault point waveforms are searched for, and the current waveforms of multiple cyclic waves before and after the fault and time information of the current waveforms are transmitted to a convergence module; and the convergence module wirelessly transmits the fault information data to a positioningcalculation module of a power distribution network automation master station, calculates to obtain a fused traveling wave velocity, and calculates a fault point position by adopting a double-end traveling wave distance measurement algorithm according to the fault information data.

Description

technical field [0001] The invention relates to the technical field of distribution network fault location, in particular to a distribution network single-phase ground fault location device and method. Background technique [0002] Prior art document 1 (Heng Sikun, Wei Hairong, Zhu Liwei, Li Dezhong, Yang Hao. A single-phase ground fault location method in distribution network [P].CN103454561A, 2013-12-18.) discloses a A method for locating a single-phase ground fault in a distribution network uses a utility pole or a branch line as a node to install a fault indicator, and uses the result of the fault indicator as an indication, which has low efficiency and poor positioning accuracy. [0003] Prior art 2 (Sun Zhongyao, Xu Fei, Tang Shengrun, Wang Liang, Lai Xiaoming. A fault recorder [P].CN203519741U, 2014-04-02.) discloses a fault recorder, but the fault recorder The device has a large volume, high energy consumption, and cannot be deployed in the field. It can only be use...

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Problems solved by technology

[0002] Prior art document 1 (Heng Sikun, Wei Hairong, Zhu Liwei, Li Dezhong, Yang Hao. A single-phase ground fault location method in distribution network [P].CN103454561A, 2013-12-18.) discloses a A method for locating single-phase ground faults in a distribution network, using utility poles or branch lines as nodes to install fault indicators, and using the results of fault indicators as indications, has low efficiency and poor positioning accuracy

[0003] Prior art 2 (Sun Zhongyao, Xu Fei, Tang Shengrun, Wang Liang, Lai Xiaoming. A fault recorder [P].CN203519741U, 2014-04-02.) discloses a fault recorder, but the fault recorder The device has a large volume, high energy consumption, and cannot be deployed in the field. It can only be used for gateway data recording on the substation side. It cannot accurately describe the data of each branch line, and there are certain blind spots.

[0004] Due to the large amount of information collected by transient data, and the amount of information will be even greater after the collection rate is further increased in the future, if centralized storage of wave recording signals is used, the network load will be huge, and the stability of the network will be difficult to meet the demand

In addition, due to the complex electromagnetic radiation environment of overhead transmission lines, there is certain interference to the communication of the fault location device

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