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Distribution network arc grounding fault identification method

A technology of ground fault and identification method, applied in the field of arc ground fault identification in distribution network, can solve problems such as arc ground fault processing

Active Publication Date: 2018-02-23
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the traditional distribution network usually weakens the arc overvoltage hazard through the arc suppressing coil or small resistance grounding operation mode, but there is no further treatment for the arc ground fault

Method used

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  • Distribution network arc grounding fault identification method
  • Distribution network arc grounding fault identification method
  • Distribution network arc grounding fault identification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] see Figure 1~3 , a distribution network arc ground fault identification method provided in an embodiment of the present invention, the method includes the following steps:

[0042] S1: Obtain the fault phase voltage and zero-sequence current waveform data of the fault, and judge the time when the fault occurs;

[0043] S2: Count the number of occurrences of zero-sequence current arc discharge in the fault within the preset time period when the fault occurs, and identify the fault type.

[0044] First, according to the voltage and current waveforms, judge the time when the fault occurs, and then select a period of time when the fault occurs, and count the number of current arc discharge phenomena during this period to determine whether it is an arc ground fault.

Embodiment 2

[0046] see Figure 1~3 , a distribution network arc ground fault identification method provided in an embodiment of the present invention, the method includes the following steps:

[0047] Obtain the fault phase voltage and zero-sequence current waveform data of the fault, and judge the time when the fault occurs;

[0048] Calculate the normal phase voltage u of the line before the fault0 , calculate the fault phase voltage u of the second cycle after the fault, and judge whether the fault phase voltage drop exceeds the limit;

[0049] Count the number of occurrences of zero-sequence current arc discharge in the fault within the preset time period when the fault occurs, and identify the fault type.

[0050] Firstly, according to the voltage and current waveforms, judge the fault occurrence time. If the judgment cannot be made from the waveform or to confirm the fault occurrence time, then determine the fault occurrence time by judging whether the voltage drop exceeds the limi...

Embodiment 3

[0052] see Figure 1~3 , a distribution network arc ground fault identification method provided in an embodiment of the present invention, the method includes the following steps:

[0053] S1: Obtain the fault phase voltage and zero-sequence current waveform data of the fault, and judge the time when the fault occurs;

[0054] S2: Count the number of occurrences of zero-sequence current arc discharge in the fault within the preset time period when the fault occurs, and identify the fault type.

[0055] Optionally, the method includes the steps of:

[0056] Obtain the fault phase voltage and zero-sequence current waveform data of the fault, and judge the time when the fault occurs;

[0057] Calculate the normal phase voltage u of the line before the fault 0 , calculate the fault phase voltage u of the second cycle after the fault, and judge whether the fault phase voltage drop exceeds the limit;

[0058] Count the number of occurrences of zero-sequence current arc discharge...

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Abstract

The invention relates to the technical field of power fault identification and particularly relates to a distribution network arc grounding fault identification method. In the traditional distributionnetwork, arc overvoltage damages are generally weakened through an arc suppression coil or a small resistance grounding operation mode, but no further processing for arc grounding fault exists. The distribution network arc grounding fault identification method provided by the invention comprises steps: fault phase voltage and zero sequence current waveform data of the fault are acquired, and a fault happening time is judged; the zero sequence current arc discharging phenomenon appearing times in the fault in a fault happening preset time period are counted to judge a fault type; and a specific peak pulse discharging form generated during the arc discharging process is detected, the arc discharging phenomenon frequency in the case of the fault is counted, and fault type identification is realized.

Description

technical field [0001] The present application relates to the technical field of power fault identification, and in particular to a method for identifying arc-flash ground faults in a distribution network. Background technique [0002] my country's medium and low voltage distribution network is dominated by overhead lines, the structure of the line is complex, there are many branches, and it is prone to failure. According to statistics, during the operation of the power system, power outages caused by distribution network faults account for more than 95% of the total power outages, and 70% of them are caused by single-phase ground faults or busbar faults. Among them, arcing grounding has always been a common fault in the distribution network, and the continuous development of arcing grounding will lead to arcing overvoltage, which is a serious hidden danger to the safe operation of the power grid. [0003] The traditional distribution network usually weakens the hazard of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 王洪林刘亚东董涛郭霖徽刘柱揆范黎涛
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST