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Method for accurately judging earth fault moment of small current earthing system master station

A small current grounding and grounding fault technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of inaccurate grounding characteristics, misjudgment of grounding positioning, etc., and achieve the effect of accurate and effective similarity

Active Publication Date: 2019-10-01
KEDA INTELLIGENT ELECTRICAL TECH +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The grounding characteristics judged by the system master station are inaccurate, which eventually leads to misjudgment of the grounding location
However, according to the State Grid’s regulations on fault waveforms, the waveform obtained by the system master station only includes the three-phase balance part before the fault and the transient mutation part at the time of the fault. How to accurately obtain the fault waveform and the starting point of the transient mutation at the time of the fault becomes The problems that the main station system must solve

Method used

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  • Method for accurately judging earth fault moment of small current earthing system master station
  • Method for accurately judging earth fault moment of small current earthing system master station
  • Method for accurately judging earth fault moment of small current earthing system master station

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with accompanying drawing:

[0024] Such as figure 1 A method for the master station of a small current grounding system to accurately judge the moment of the ground fault is shown, the method includes the following steps:

[0025] (1) The system master station obtains the ground fault waveform. After a small current ground fault occurs in the distribution network line, the voltage monitor installed at the outlet end of the busbar and the current monitor installed at each branch line end will synthesize the collected fault waveform into a zero-sequence waveform at the communication terminal and upload it to the system through the wireless network The master station, the master station of the small current grounding system, obtains the fault waveforms reported by the monitors installed on each line, and the fault waveforms are as follows: figure 1 shown. The main station of the system obtains the fau...

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Abstract

The invention relates to a method for accurately judging an earth fault moment of a small current earthing system master station. The method comprises the steps of: 1, acquiring an earth fault waveform by using the system master station; 2, computing an initial difference gear I of the faulted waveform; 3, acquiring a current difference gear D of the faulted waveform; 4, finding suspicious fault moment points; 5, judging continuous transient mutation; and 6, calling back the suspicious fault moment points. From the technical scheme above, it can be known that the probability of finding the small current earth fault moment point can be improved, and thus the transient polarity, amplitude and similarity computed based on the found fault moment point are accurate and valid.

Description

technical field [0001] The invention relates to the technical field of small current fault location systems, in particular to a method for accurately judging the time of a ground fault by a master station of a small current grounding system. Background technique [0002] For the problem of small current single-phase ground fault location, the distribution network widely installs line monitors on overhead lines to monitor line current and line-to-ground electric field. After the ground fault occurs, the monitor of the three-phase line collects the fault current waveform of each phase line, and passes the waveform data through the corresponding communication terminal to synthesize the zero-sequence current and upload it to the system master station. The system master station analyzes the zero-sequence waveform of each installation point of the overall topology, obtains the characteristics of the transient waveform at the time of the ground fault, and locates the fault point. ...

Claims

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Application Information

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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 秦明辉卫保虎谭战稳戴景峰童杰赵小虎吴启文
Owner KEDA INTELLIGENT ELECTRICAL TECH
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