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Fault positioning protecting device and method based on power distribution network smart terminal

An intelligent terminal and fault location technology, applied in the fault location, emergency protection circuit devices, electrical components, etc., can solve the problems of long cut-off time and large influence range, and achieve the effect of avoiding the shortening of switch life.

Inactive Publication Date: 2014-03-26
STATE GRID CORP OF CHINA +3
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to provide a fault location and protection method based on the intelligent terminal of the distribution network to solve the problems of long cut-off time and large influence range of the existing fault location method, and to provide a location protection device using the method

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  • Fault positioning protecting device and method based on power distribution network smart terminal
  • Fault positioning protecting device and method based on power distribution network smart terminal
  • Fault positioning protecting device and method based on power distribution network smart terminal

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Embodiment Construction

[0029] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0030] In the power distribution system, the closed set composed of distribution switches and feeder segments is called a power distribution area. If all the endpoints of an area are switches and there are no interior points or all interior points are T-contacts, the area is called the minimum power distribution area, and the power distribution switch directly connected to the load becomes the power distribution terminal. The distribution network is composed of multiple minimum distribution areas and multiple distribution terminals. Distribution network fault location is equal to solving the smallest distribution area and distribution terminal fault location.

[0031] The current direction is defined as the positive direction flowing from the system side to the load side, that is, the current flows from the upstream direction to the downstrea...

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Abstract

The invention discloses a fault positioning protecting device and method based on a power distribution network smart terminal. The method includes: dividing a power distribution network into at least one minimum power distribution area, calculating the fault state differential value Ssum of each area, comparing Ssum of each area with the state preset value of the area, determining a differential protecting action through short-time delay if the comparison difference of the area satisfies the set condition, and tripping all distribution switches in the area after differential protection to realize fault isolation. The fault positioning protecting device and method based on the power distribution network smart terminal has the advantages that the power distribution area differential principle is used, the isolation time of power distribution network faults can be controlled within 100ms, the problems that the service lives of switches are shortened due to the fact that multiple times of on and off of the switches and users are impacted in traditional power distribution network fault isolation are solved, and the device is unaffected by the accessing of a distributed power supply.

Description

technical field [0001] The invention belongs to the field of relay protection automation in the field of electric power engineering, and in particular relates to a fault location protection device and method based on an intelligent terminal of a distribution network. Background technique [0002] The modern power system is composed of power generation, power transmission, power transformation, power distribution and users. For a long time, my country's power industry has had the bad phenomenon of "heavy power generation, light power supply, and no use". It has always paid more attention to the construction of power generation and power transmission facilities. At present, The domestic high-voltage transmission network has been able to accurately locate the fault point, but relatively neglected the investment and transformation of the power distribution system, resulting in the unfavorable situation of low power supply reliability, poor power quality, and large user opinions. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22G01R31/08
CPCY04S10/522H02H7/261
Inventor 李国斌刘星史宏光姜睿智马仪成尹建仑张义李俊刚魏勇
Owner STATE GRID CORP OF CHINA
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