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A ground fault line selection tripping method and system in a resonant grounding system

A ground fault and resonant grounding technology, which is applied in the direction of fault location, fault detection according to conductor type, instrument, etc., can solve problems affecting power supply reliability, power failure, and unsatisfactory accuracy, so as to avoid power supply reliability, Avoid power failure loss and reduce the amount of calculation

Active Publication Date: 2022-06-21
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to various reasons, the accuracy of the existing line selection methods in practical applications has not been able to reach a satisfactory level. Some cities still use manual road pulling to determine the fault location, causing many unnecessary power outages and greatly Affect power supply reliability

Method used

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  • A ground fault line selection tripping method and system in a resonant grounding system
  • A ground fault line selection tripping method and system in a resonant grounding system
  • A ground fault line selection tripping method and system in a resonant grounding system

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Embodiment Construction

[0029] In order to make the purposes, technical effects and technical solutions of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; are some embodiments of the present invention. Based on the embodiments disclosed in the present invention, other embodiments obtained by persons of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0030] A ground fault line selection and tripping method in a resonant grounding system according to an embodiment of the present invention includes the following steps: when a ground fault occurs, use the total time sequence coefficient (TTSC) calculated from the zero-sequence current zero-crossing time of each line to perform the fault Line identification.

[0031] A ground fault line...

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Abstract

The invention discloses a grounding fault line selection tripping method and system in a resonant grounding system. The method includes the following steps: after the grounding fault occurs, the fault is performed using the total timing coefficient calculated from the zero-sequence current zero-crossing time of each line. Line identification. The invention only uses the zero-crossing time information of the zero-sequence current after each line fault occurs to select the line, the amount of calculation is small, and the line can still be selected correctly when the zero-sequence CT is reversed, and the trouble caused by checking the polarity of the zero-sequence CT is avoided. Power failure loss; the method of the invention can correctly select lines under various fault transition resistances and fault phase angles, and has strong adaptability.

Description

technical field [0001] The invention belongs to the technical field of single-phase grounding fault processing of power distribution network, and particularly relates to a ground fault line selection tripping method and system in a resonance grounding system. Background technique [0002] The small current grounding includes the neutral point not grounded and the neutral point grounded through the arc suppression coil (also known as resonant grounding), which has the advantages of small fault current and uninterrupted power supply when single-phase grounding occurs. Generally, whether to install an arc suppression coil is selected according to whether the fault arc can be extinguished by itself. Therefore, when the system capacitance current is less than 10A, the neutral point is not grounded, and when it is greater than 10A, the resonance grounding is used. There is no problem in the fault line selection of the neutral point ungrounded system, but in the resonant grounded s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08H02H7/28
CPCG01R31/086G01R31/088H02H7/28
Inventor 王毅钊刘健张志华任双雪夏楠陈洁羽权立雷妤航李斌
Owner STATE GRID CORP OF CHINA
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