A voltage line selection method for resonant grounding system

A technology of resonant grounding and line selection method, applied in the field of distribution network, can solve the problem of lack of single-phase grounding fault line selection and so on

Active Publication Date: 2021-04-06
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

[0004] Aiming at the current distribution network resonant grounding system lacking effective single-phase grounding fault line selection basis and method, the present invention provides a voltage line selection method for the resonant grounding system. It can greatly improve the correct rate of fault line selection, realize reliable line selection for single-phase ground faults in resonant grounded distribution networks, and is conducive to the automation of single-phase ground fault processing in distribution networks

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  • A voltage line selection method for resonant grounding system
  • A voltage line selection method for resonant grounding system
  • A voltage line selection method for resonant grounding system

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] At present, when a single-phase ground fault occurs in a resonantly grounded distribution network, most of the fault current can be compensated by tuning the arc suppression coil. The fault current component on the line is very small, often significantly smaller than the load current component, and the fault current component is extracted difficulty. The line selection device using the fault steady-state current component for line selection is affected by the line selection algorithm, system operation mode, grounding transition resistance, interference and transformer error, and generally has the problem of poor line selection reliability. The line selection based on the state current component is also affected by the voltage phase at the time of the fault, and it is possible that the fault transient component cannot be extracted. On site, the corresp...

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Abstract

The invention provides a voltage line selection method for a resonant grounding system. The method includes: constructing a resonant grounding system with a flexible topological structure and mutual supply of two power sources; and determining a faulty line by dividing a distribution network. The invention provides a method for voltage line selection of a resonant grounding system. By establishing a resonant grounding system, a large number of disadvantages of current line selection can be overcome, the correct rate of fault line selection can be greatly improved, and the single-phase grounding fault reliability of the resonant grounding distribution network can be realized. Line selection is conducive to the automation of single-phase-to-ground fault handling in distribution networks.

Description

technical field [0001] The invention belongs to the technical field of distribution networks, and in particular relates to a voltage line selection method for a resonant grounding system. Background technique [0002] The single-phase-to-earth fault in the distribution network has reached 80% of all faults in the distribution network. In order to reduce power outages and improve the reliability of power grid operation, most urban and rural medium-voltage distribution grids in my country generally adopt the grounding method of the neutral point through the arc suppression coil, which can continue to run for 1 to 2 hours when a single-phase ground fault occurs in the system. For fault repair and load transfer. Therefore, when a permanent single-phase ground fault occurs, the site needs to first accurately find out the faulty medium-voltage outgoing line from multiple or even dozens of outgoing lines in the distribution network substation, and then perform related operations. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 张海盛万兴宋晓辉朱吉然唐海国龚汉阳
Owner CHINA ELECTRIC POWER RES INST
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