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A single-phase disconnection fault location method for distribution network with distributed power

A distributed power supply and disconnection fault technology, which is applied in the directions of fault location, current/voltage measurement, resistance/reactance/impedance measurement, etc., can solve power system safety hazards, single-phase disconnection faults cannot be effectively identified and removed, etc. problems, achieve high sensitivity and reliability, avoid setting calculations, and are easy to achieve

Active Publication Date: 2022-06-21
GUIZHOU POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] There are sensitivity and adaptability problems in the single-phase disconnection fault location method of the distribution network proposed by the existing research. At present, there are large technical limitations in the single-phase disconnection fault protection of the distribution network with distributed power generation. The single-phase disconnection fault cannot be effectively identified and removed, which has become an important safety hazard in the power system

Method used

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  • A single-phase disconnection fault location method for distribution network with distributed power
  • A single-phase disconnection fault location method for distribution network with distributed power
  • A single-phase disconnection fault location method for distribution network with distributed power

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Embodiment 1

[0042] As the core link of smart grid construction, distribution network automation has developed rapidly in recent years. Various distribution network intelligent electronic equipment such as FTU, DTU and load recorder have been put into operation in many distribution networks. The development of network disconnection positioning technology provides the basis for automation, and research on distribution network disconnection methods based on various distribution network intelligent electronic devices has been carried out. Some scholars have been lacking effective locating or distance measurement methods for disconnection faults, using the generation mechanism of traveling waves when power lines are disconnected, and using the traveling wave principle to measure the distance of disconnected faults. Based on the changing characteristics of the current transient component, some scholars have proposed a single-phase disconnection fault line selection and positioning protection met...

Embodiment 2

[0075] In order to verify and explain the technical effect adopted in this method, this embodiment selects a variety of different methods and adopts this method to carry out comparative tests, and compares the test results by means of scientific demonstration to verify the real effect of this method.

[0076] The method based on the transient quantity uses the transient quantity of the electrical quantity after the fault to judge the fault location, which requires the support of a high-speed data acquisition device. However, the current distribution and consumption information system generally does not collect the transient information of the electrical quantity, and in the power distribution It is expensive to configure a large number of high-speed acquisition systems in the network, and it is not easy to be widely used in the field of distribution network. The existing disconnection fault locating method locates the fault according to the presence or absence of the current of...

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Abstract

The invention discloses a method for locating a single-phase disconnection fault of a distribution network including a distributed power supply, which includes setting the minimum value of the negative-sequence voltage at the terminal of the distributed power supply as a starting threshold when a single-phase disconnection fault occurs at the end of a feeder; By comparing the measured value of the negative-sequence voltage at the machine terminal with the size of the starting threshold, judge the disconnection of the feeder, and decide whether to start the disconnection location; if the disconnection location is started, set the location threshold; by comparing the distributed The zero-sequence voltage at the power supply terminal and the location threshold are combined with the topological relationship between each distributed power supply to determine the location of the single-phase fault. The invention only needs the zero-negative sequence voltage, power and load impedance of the distributed power supply, can accurately identify the single-phase short-circuit fault of the distribution network with a relatively large transition resistance, and is not affected by the power of the distributed power supply and the load impedance, is easy to implement, and has the advantages of High sensitivity and reliability.

Description

technical field [0001] The invention relates to the technical field of power system relay protection, in particular to a method for locating a single-phase disconnection fault of a distribution network with distributed power sources. Background technique [0002] In addition to common short-circuit faults in distribution network, with the increasing scale of distribution network and the high penetration of distributed energy into more complex operation methods such as microgrids, disconnection faults have also become an important factor affecting the normal operation of distribution networks. influencing factors. For a long time, the single-phase-to-ground fault and phase-to-phase fault handling of distribution network has received extensive attention, but there are few reports on the identification and handling of disconnection faults. [0003] Single-phase disconnection fault is a common type of fault in low-current grounding systems. Due to the characteristics of the di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/52G01R29/16G01R19/165G01R27/02G01R21/00
CPCG01R31/08G01R31/52G01R29/16G01R19/16576G01R27/02G01R21/00
Inventor 杜雪刘济铭刘城杰庞海东刘兵杨忠龙晓轩欧阳金鑫李华鹏陈宣林唐学用李庆生杨明波肖扬张盛安
Owner GUIZHOU POWER GRID CO LTD
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