Power distribution network single-phase earth fault detection method and system

A single-phase ground fault and detection method technology, applied in the field of distribution network detection, can solve the problems of increased calculation amount, insufficient identification of single-phase ground fault, influence of identification accuracy, etc., and achieve the effect of improving detection efficiency

Active Publication Date: 2020-08-25
威胜能源技术股份有限公司
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Problems solved by technology

The online monitoring method and system for power grid distribution line faults provided by this application realize the online monitoring of power grid distribution line faults, but a single detection device is still required to detect multiple data, i

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  • Power distribution network single-phase earth fault detection method and system
  • Power distribution network single-phase earth fault detection method and system
  • Power distribution network single-phase earth fault detection method and system

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[0036] In order to make the object, technical solution and effect of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0037] Please also refer to Figure 1-Figure 4 , the present invention provides a distribution network single-phase ground fault detection system, including a detection collection terminal 1 and a plurality of detection devices 2, a plurality of detection devices 2, installed in each installation node of the distribution network, respectively connected with the detection Pool Terminal 1. The installation node includes: a head end of an outgoing line, a line segmentation point, a head end of a branch line, and a user demarcation point. The detection device 2 is used to detect the current of...

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Abstract

The invention relates to a power distribution network single-phase earth fault detection method and system. The power distribution network single-phase earth fault detection method comprises steps that S1, a plurality of detection devices send detected three-phase current sampling data to a detection collection terminal, and the detection collection terminal filters all the three-phase current sampling data; and S2, the detection collection terminal calculates three-phase abrupt change current effective values and three groups of correlation coefficients between every two phase lines accordingto the three-phase current sampling data sent by each detection device. The metod is advantaged in that the single-phase earth fault identification is carried out based on three-phase current sampling data, the single-phase earth fault detection method provided by the invention does not need to additionally acquire a zero-sequence voltage signal, improves fault detection efficiency, is convenientand quick in configuration of the detection topology, even does not need to update hardware equipment, can finish updating only by replacing the detection method with the single-phase earth fault detection method provided by the invention, and has great progress.

Description

technical field [0001] The invention relates to the field of distribution network detection, in particular to a method and system for detecting a single-phase ground fault in a distribution network. Background technique [0002] As a clean and efficient secondary energy source, electric energy is closely related to national economic construction and people's daily life, and the power system that collects electric energy production, transmission, distribution and consumption, as a pillar industry of the national economy and people's livelihood, is very important to all walks of life. With the progress of modern society, the rapid development of economy and the sharp increase of power load, higher and higher requirements are put forward for the reliability, stability, safety and quality of power system. [0003] my country's distribution network mainly adopts the low-current grounding method. For single-phase grounding faults, since the line voltage between the three phases is...

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Application Information

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IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088G01R31/52
Inventor 杨志祥冯喜军曾辛曹朝晖孙勇卫曹奇李强
Owner 威胜能源技术股份有限公司
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