A fault location and protection device and method based on an intelligent terminal of a distribution network
An intelligent terminal and fault location technology, which is applied to fault locations, emergency protection circuit devices, electrical components, etc., can solve problems such as long cut-off time and large impact range, and achieve the effect of avoiding the shortening of switch life
Inactive Publication Date: 2016-08-17
STATE GRID CORP OF CHINA +3
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[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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[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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Disclosed are a fault locating protection apparatus and method based on a power distribution network intelligent terminal. The method comprises: dividing a power distribution network into at least one minimum power distribution area, calculating the fault state differential value Ssum of each area, comparing the fault state differential value Ssum of each area with a state set value of this area, determining a differential protection action through short-time delay if the comparison difference of the area satisfies a set condition, and after the differential protection action, tripping off all distribution switches in the area to realize fault isolation. By adopting the fault state differential principle for power distribution areas, the fault locating protection method based on the power distribution network intelligent terminal can control the time for the fault isolation of power distribution networks within 100ms, thereby solving the problems of shortened service life of switches and an impact upon users due to the fact that the switches are opened and closed many times in traditional power distribution network fault isolation and also avoiding an influence caused by the access 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...
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IPC IPC(8): H02H7/22G01R31/08
CPCH02H7/261
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
OwnerSTATE GRID CORP OF CHINA