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A method for judging the start time of waveform fault of distribution network fault indicator

A distribution network fault and start time technology, applied in the field of intelligent distribution network, can solve problems such as misjudgment and achieve the effect of improving accuracy

Active Publication Date: 2021-10-15
GUIZHOU POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for judging the start time of the waveform fault of the distribution network fault indicator, so as to solve the problem of using the fault start time based on the slope mutation amount in the prior art to judge the start time of the waveform fault of the distribution network fault indicator. The starting point judgment method has great limitations, and it is easy to misjudge "noise" as a fault

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  • A method for judging the start time of waveform fault of distribution network fault indicator
  • A method for judging the start time of waveform fault of distribution network fault indicator
  • A method for judging the start time of waveform fault of distribution network fault indicator

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Embodiment Construction

[0030] At present, the fault indicator is generally used to acquire three-phase current, and then use the aggregate current to synthesize the three-phase current into the fault positioning using the three-phase synthesis zero sequence current. For small current grounding systems, one direction is to use fault transient signals to perform fault lines and positioning. Select transient zero sequence current for fault line and positioning Based on the following features: Transient current is far more than steady-state capacitive current; the ratio of transient maximum current and steady-state capacitor current can reach several times to ten times; The maximum current value is related to the voltage phase angle of the fault; the transient current value is not affected by the arc coil, the fault judgment is strong; the fault line current is polarity, the direction is opposite to the non-default line; the current direction of the fault point is different. The waveform is different.

[00...

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Abstract

The invention discloses a method for judging the start time of a waveform fault of a distribution network fault indicator, which includes: step 1, reading in a waveform file of a waveform recording device; step 2, taking a sampling point of the waveform file, and calculating the sampling point Same as the time rate of change B at the next point, and the threshold B 0 Comparing, if exceeding, represent that this sampling point may be the time point of fault occurrence; proceed to step 3, if not exceed, then proceed to the next sampling point; step 3, calculate the half-wave current area integral I of this sampling point area and with I set Comparison, if less than or equal to return to step 2, greater than then judge to find the fault starting point; solve the problem of using the fault starting point judgment method based on the slope mutation amount in the prior art to judge the fault starting point of the fault indicator waveform of the distribution network It is easy to misjudge "noise" as a fault and other problems.

Description

Technical field [0001] The present invention belongs to the technical field of intelligent distribution network, and more particularly to a distribution network fault indicator waveform fault start time judgment method. Background technique [0002] The diagnosis of distribution network faults is inseparable from the completeness of data acquisition information, in suburbs and rural areas and rural areas with low population, and even some urban areas are difficult to implement. More economical, it can achieve the fault destination, that is, the fault indicator. The positioning of the fault indicator is to place the fault indicator on the distribution line. When the fault occurs, by detecting the fault current characteristics, the fault is positioned in the middle of the two devices that flow through and no fault current flow. . my country's medium-pressure distribution grid neutral point is not grounded or missed, and the fault line and positioning are difficult when single-phase...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 丁健马春雷付滨吴金勇杜雪刘兵王丰黄玉辉
Owner GUIZHOU POWER GRID CO LTD
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