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Distribution network fault studying and judging method and system based on sudden reduction degree of feeder current and probability density of the proportion of switch loads

A technology of probability density and feeder current, applied in the direction of fault location, measurement of electricity, measurement of electrical variables, etc., can solve the problems of high real-time and reliability requirements of the communication system, long time for fault research and judgment, etc., to ensure reliability and speed of research and judgment fast effect

Active Publication Date: 2021-10-08
YUNNAN POWER GRID CO LTD KUNMING POWER SUPPLY BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need to read data after a fault, these methods have high requirements on the real-time and reliability of the communication system, and the fault research and judgment takes a long time, which takes tens of minutes, hours or even longer

Method used

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  • Distribution network fault studying and judging method and system based on sudden reduction degree of feeder current and probability density of the proportion of switch loads
  • Distribution network fault studying and judging method and system based on sudden reduction degree of feeder current and probability density of the proportion of switch loads
  • Distribution network fault studying and judging method and system based on sudden reduction degree of feeder current and probability density of the proportion of switch loads

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Embodiment 1

[0043] This embodiment discloses a distribution network fault research and judgment method based on feeder current sag degree and switch load proportion probability density.

[0044] After a fault occurs in the distribution network, because the fault current is greater than the setting value of the switch protection action on the line, the action and reclosing process of the line relay protection system will be triggered. After the selective action of the protection or the reclosing process, the upstream line switch closest to the fault point will trip and disconnect, and all distribution transformers and their loads downstream of the switch will be cut off, resulting in a sudden drop in power at the feeder outlet. Under the condition of ignoring the line loss, the percentage δ of the load dip at the outlet of the feeder is equal to the percentage λ of the load downstream of the trip switch to the load of the entire line. Therefore, if the percentage of the downstream load of ...

Embodiment 2

[0079] Corresponding to the above-mentioned embodiments, this embodiment discloses a distribution network fault research and judgment system based on the feeder current sag degree and the probability density of the switch load ratio, including a memory, a processor, and a memory stored in the memory and can be stored on the processor. A running computer program, the processor implements the corresponding steps of the above method when executing the computer program.

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Abstract

The invention relates to the technical field of power distribution network automation, and discloses a distribution network fault studying and judging method and system based on the sudden reduction degree of feeder current and the probability density of the proportion of switch loads, so as to improve the real-time performance and reliability of fault positioning. The method comprises the following steps: monitoring the sudden reduction degree of current at the outlet of a feeder line in real time, determining that a fault occurs when the sudden reduction degree is greater than a certain threshold value, and recording the fault occurrence time and the sudden reduction degree of the current of the feeder line; then, mapping into a pair of binary coordinates, and searching a load proportion probability density table (curve) of each switch in the line according to the coordinates; one or more switches with the maximum probability density being judged as tripping switches.

Description

technical field [0001] The invention relates to the technical field of distribution network automation, in particular to a distribution network fault research and judgment method and system based on feeder current sag degree and switch load proportion probability density. Background technique [0002] The degree of automation and penetration rate of distribution network in most parts of my country is not high, and there is no feeder automation in many places, or although there is feeder automation, the number of intelligent terminals (feeder terminals and fault indicators, etc.) is small, and the fault uploaded in case of failure The information is often wrong or missing, and relying on the feeder automation intelligent terminal to locate the fault is not accurate, or the positioning range is not accurate enough. [0003] The existing fault research and judgment methods generally summon the data of each distribution transformer and user's electric meter after a fault, and per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/088Y04S10/52
Inventor 保文鸿宗德文马兴源张小丽欧钰瞧刘思明张瑞颖方倩朱利明潘堋
Owner YUNNAN POWER GRID CO LTD KUNMING POWER SUPPLY BUREAU
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