Distribution line bi-directional latch-up protection method based on master station decision identification

Abstract

The invention discloses a distribution line bi-directional latch-up protection method based on master station decision identification. By means of the network communication technology and peer-to-peer communication between line terminals (FTUs), fault and action information is switched between the upper level of protection and the lower level of protection which are adjacent, and therefore short-circuit fault bi-directional latch-up protection is achieved, the action time delay caused by multilevel matching is effectively shortened, rapid fault isolation is achieved, and the number of fault hazards is reduced. According to the method, the current situation that the majority of outlet circuit breakers do not participate in latch-up on site is fully considered, and faults can still be accurately positioned and isolated after power outage transferring and network topology changing. The distribution line bi-directional latch-up protection method based on master station decision identification is suitable for the situation that the outlet circuit breakers do not participate in latch-up and particularly suitable for line protection of a power distribution network which is designed in a closed loop mode and runs in an open loop mode (namely transferring of a standby power supply exists).

Description

technical field [0001] The invention belongs to the field of relay protection for power system distribution lines, in particular to a bidirectional blocking protection method for distribution lines based on master station decision recognition. Background technique [0002] Traditional relay protection mostly uses the coordination of the setting value and time to realize the detection and isolation of line faults. Using the setting value is not easy to cooperate, and it is easy to leapfrog action; using time coordination, the fault removal time is long, and it may damage the main transformer and other equipment. ; Moreover, the relay protection and the safety automatic device lack cooperation and are independent of each other, so data sharing cannot be carried out. In short, the existing protection and safety automatic devices can no longer meet the requirements of power system development. [0003] In recent years, the rapid development of distribution network automation te...

AI Technical Summary

Problems solved by technology

The two-way permissive overcurrent protection method that does not discriminate the direction of the fault current does not discriminate the current direction. After the FTU senses the overcurrent, it sends a permit signal to its adjacent sides, requiring the exit circuit breaker to participate in the transmission of the permit signal, which cannot be adapted to the on-site exit circuit breaker. Not participating in signal transmission or reception

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