Distribution line single-phase earth fault line selection method and computer readable storage medium

A single-phase grounding fault and distribution line technology, applied in the fault location, circuit device, emergency protection circuit device, etc., can solve the problem of inability to select branch lines, and achieve the effect of accurate line selection

Active Publication Date: 2020-04-14
TSINGHUA UNIV
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Problems solved by technology

All current single-phase ground fault line se

Method used

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  • Distribution line single-phase earth fault line selection method and computer readable storage medium
  • Distribution line single-phase earth fault line selection method and computer readable storage medium
  • Distribution line single-phase earth fault line selection method and computer readable storage medium

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[0030] In order to be able to understand the above objectives, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the application and the features in the embodiments can be combined with each other if there is no conflict.

[0031] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited to the specific details disclosed below. Limitations of the embodiment.

[0032] Such as figure 1 As shown, a flow diagram of a single-phase grounding line selection method for a distribution line based on phase current traveling wave comparison according to an example of the ...

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Abstract

The invention provides a distribution line single-phase earth fault line selection method based on phase current traveling wave comparison. The method comprises the following steps: collecting three-phase current traveling waves on a distribution line, and taking a bus pointing line as a current positive direction; when a single-phase earth fault occurs in the distribution line, comparing the amplitude and the polarity relationship of the difference before and after the three-phase current traveling wave fault; when the amplitude of one phase of current traveling wave difference is greater than the amplitude of the other two phases of current traveling wave differences by more than 1.5 times, and the polarity of the phase of current traveling wave difference with the maximum amplitude is opposite to the polarity of the other two phases of current traveling wave differences, judging that the fault occurs on the line on the load side of the measurement point and the phase with the maximum current traveling wave difference amplitude is a fault phase; and if the three-phase current traveling wave difference amplitudes are the same and the polarities are the same, judging that the faultoccurs on the line at the power supply side of the measurement point. Through the technical scheme of the invention, accurate line selection of the single-phase earth fault of the distribution line can be realized.

Description

technical field [0001] The invention relates to the technical field of power system protection and control, in particular to a line selection method for single-phase grounding faults of power distribution lines. Background technique [0002] Single-phase ground fault is the main fault type of distribution network, accounting for more than 80%. In order to improve the reliability of power supply, the neutral point of the power distribution system is usually not effectively grounded. The industry standard stipulates that the system is allowed to maintain operation for 2 hours after a single-phase ground fault occurs. However, after a single-phase ground fault occurs, a large capacitive current will flow through the ground point. Generally, when the ground capacitive current exceeds 30A, in order to avoid arc reignition and arc overvoltage, an arc suppression coil is often used to compensate the capacitive current. There are three ways to compensate the capacitive current by...

Claims

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Application Information

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IPC IPC(8): G01R31/52G01R31/08G01R31/11
CPCG01R31/088G01R31/085G01R31/11G01R31/52Y04S10/52G01R19/2513G01R19/04H02H3/165G01R19/0038
Inventor 施慎行钱其隆董新洲
Owner TSINGHUA UNIV
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