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Power distribution network single-phase disconnection fault detection method and system

A technology of disconnection fault and detection method, which is applied in the field of electric power system, can solve problems such as personal electric shock casualties, motor damage, etc., achieve rapid positioning and isolation, and realize the effect of automatic positioning and isolation

Pending Publication Date: 2021-10-01
STATE GRID SHAANXI ELECTRIC POWER RES INST +1
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Problems solved by technology

[0002] Disconnection faults in the distribution network lead to accidents such as overvoltage, motor damage, and personal electric shock casualties. Therefore, it is necessary to propose a method that can quickly and reliably detect disconnection faults.

Method used

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  • Power distribution network single-phase disconnection fault detection method and system
  • Power distribution network single-phase disconnection fault detection method and system
  • Power distribution network single-phase disconnection fault detection method and system

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Embodiment Construction

[0054]The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0055] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude one or Presence or addition of multiple other features, integers, steps, operations, elements, components and / or collections thereof.

[0056] It should also be understood that the terminology used in the ...

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Abstract

The invention discloses a power distribution network single-phase disconnection fault detection method and system. The method comprises the following steps: calculating a positive sequence voltage and a positive sequence current; calculating a positive sequence voltage break variable and a positive sequence current break variable according to the positive sequence voltage and the positive sequence current; when the amplitude of the positive sequence voltage break variable is larger than a starting threshold value, calculating the phase difference beta between the positive sequence voltage break variable and the positive sequence current break variable, wherein when the phase difference beta meets the condition that beta is larger than -90 degrees and smaller than 90 degrees, the line is an intact line, and when the phase difference beta meets the condition that beta is larger than -180 degrees and smaller than -90 degrees, and beta is larger than 90 degrees and smaller than 180 degrees, the line is a fault line; and realizing broken line fault line selection according to the phase difference beta, or section positioning of broken line faults based on voltage-time type, intelligent distributed or centralized feeder lines. According to the method, three broken line forms can be considered, broken line fault line selection is realized only by depending on measurement data of each outgoing line outlet of the transformer substation, and meanwhile, the method can be combined with voltage-time type feeder automation, intelligent distributed feeder automation and centralized feeder automation to realize automatic positioning and isolation of broken line faults.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a single-phase disconnection fault detection method and system of a distribution network. Background technique [0002] Disconnection faults in the distribution network lead to accidents such as overvoltage, motor damage, and personal electric shock. Therefore, it is necessary to propose a method that can quickly and reliably detect disconnection faults. Single-phase disconnection faults are divided into three forms: disconnection and non-ground fault, disconnection power source side ground fault and disconnection load side ground fault. The fault characteristics of the three modes are different but also show certain commonality. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a single-phase disconnection fault detection method and system for a distribution network based on the above-mentioned defici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 常仲学张志华王毅钊宋国兵
Owner STATE GRID SHAANXI ELECTRIC POWER RES INST
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