An overhead line feeder automation method and system based on negative sequence current

A feeder automation, negative sequence current technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of power grid impact, long fault isolation time, etc., and achieve the effect of reducing the number of impacts, less information, and rapid fault isolation.

Active Publication Date: 2019-05-28
ZHUHAI POWER SUPPLY BUREAU GUANGDONG POWER GIRD CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of isolating the fault, the switch in the substation needs to be reclosed twice, which takes a long time to isolate the fault and causes multiple impacts on the power grid

Method used

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  • An overhead line feeder automation method and system based on negative sequence current

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Experimental program
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Embodiment 1

[0026] The overhead line feeder automation method based on negative sequence current of the present invention comprises the following steps:

[0027] S1. Establish a voltage-time feeder automation model, including a section switch group and substation outgoing switch CB1 and substation outgoing switch CB2 connected to both ends of the section switch group. The section switch group includes n section switches FS connected in sequence 1 、FS 2 ,...,FS n ; Also includes tie switch LS, tie switch LS is set in the i-th section switch FS i and the jth segment switch FS j Between, j=i+1; segment switch FS 1 、FS 2 ,...,FS n Connected to the automation terminal FTU respectively 1 、FTU 2 ,...,FTU n , automated terminal FTU 1 、FTU 2 ,...,FTU n Both are connected with the system master station;

[0028]S2. When the overhead line fails, the outgoing switch CB1 of the first substation detects the fault current and trips. 1 、FS 2 ,...,FS i Opening due to loss of pressure;

[0...

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Abstract

The invention relates to the technical field of distribution network automation systems, in particular to a negative-sequence current-based feeder automation method and system for an overhead line. Fault point positioning is carried out through interactive fault negative-sequence current information between adjacent automation terminals according to the principle that fault negative-sequence current is detected at a power supply side of a fault point and the fault negative-sequence current is not detected on a load side, so that quick fault isolation and quick power supply restoration of a power distribution network are quickly achieved. In a fault treating process, substation outlet switches are reclosed once and sectional switches at the power supply side of the fault point are reclosedonce, so that the fault treating time is shortened and the number of impacts on the power distribution network is reduced. A wireless communication mode is adopted in the absence of an optical fiber communication condition. The interactive information is limited between two adjacent terminals and is small in amount of information, so that the requirements on communication are reduced.

Description

technical field [0001] The present invention relates to the technical field of distribution network automation systems, and more specifically, to a negative-sequence current-based overhead line feeder automation method and system. Background technique [0002] Distribution network automation plays a strong role in improving the reliability of distribution network power supply, expanding the power supply capacity of distribution network, and realizing efficient and economical operation of distribution network. As the most important function in distribution network automation, feeder automation is an effective means to quickly isolate faults and restore power quickly in the distribution network. Its operation has a direct impact on the implementation effect of distribution network automation. [0003] At present, the voltage-time feeder automation mode is mainly used to isolate overhead line faults. This automation mode does not require the participation of the master station....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/263
Inventor 吴炬卓高紫建
Owner ZHUHAI POWER SUPPLY BUREAU GUANGDONG POWER GIRD CO
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