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.
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[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;
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