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Method for locating fault points in small current grounding faults by use of RS fractal dimension

A small current grounding, fractal dimension technology, applied in the fault location, detecting faults according to conductor type, measuring electricity and other directions, can solve the problems of distributed capacitance and grounding method, limited number of measurement line branches, etc.

Inactive Publication Date: 2017-12-12
HANGZHOU LINGER ELECTRIC POWER TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the existing problems that the existing fault point location method is easily affected by grounding resistance, distributed capacitance and grounding mode, and the number of branches of the measuring line is limited. The method of locating the fault point in the fault

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  • Method for locating fault points in small current grounding faults by use of RS fractal dimension

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Embodiment 1

[0020] like figure 1 As shown, the specific embodiment of a method for locating the fault point in the small current grounding fault by using RS fractal dimension of the present invention consists of the historical zero-sequence current waveform and the input part of the fault point position, and the zero-sequence current waveform input part of the fault line. , Transient process waveform selection part, low-pass filter part, RS calculation part, function fitting part and fault point judgment part. Among them, the historical zero-sequence current waveform and the fault point position input part collect the historical fault data y of a certain line k , k=1, 2, 3 (the percentage of fault distance to the total length of the line) and the zero-sequence fault current waveform, generally only three groups can be completed, and similar lines can use data interchangeably. The zero-sequence current waveform input part of the faulty line collects the zero-sequence current waveform of t...

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Abstract

The invention discloses a method for locating fault points in small current grounding faults by use of RS fractal dimension. The method is characterized in that based on the waveform of zero sequence transient current of fault lines, fault dimensions are obtained through calculation, and the fault points are selected through a fitting function of the fault dimensions and the fault points. According to the method, the fault points in the small current grounding faults can be effectively identified through calculation so long as the zero sequence transient current of the fault lines are acquired, and the fitting function is obtained by taking historic data as the basis, and the method is effective for systems adopting the operation modes of neutral ungrounding, neutral point high-resistance grounding, neutral point peterson coil grounding and the like.

Description

technical field [0001] The invention relates to a method for quickly judging grounding faults in a power system, in particular to a method for quickly locating fault points in small current grounding faults. Background technique [0002] The vast majority of distribution network faults are single-phase-to-ground faults. During long-term operation with faults, overvoltage may easily cause new grounding points for power equipment and expand the accident. Therefore, it is very important to quickly select and eliminate the fault point after the fault. [0003] Impedance method, traveling wave method, outdoor fault point detection method, etc. are widely used in the existing power system. [0004] 1. Due to the influence of grounding resistance, the impedance method is difficult to guarantee the ranging accuracy; [0005] 2. Fault location methods such as traveling wave method are mainly used for high-voltage transmission lines with few branches, because for a multi-branch 10K...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 陈剑萍
Owner HANGZHOU LINGER ELECTRIC POWER TECH CO LTD