Power direction judgment based bidirectional blocking protection method for distributing line

Abstract

The invention discloses a power direction judgment based bidirectional blocking protection method for a distributing line. According to the power direction judgment based bidirectional blocking protection method for the distributing line, information interchange between FTUs (Feeder Terminal Unit) is achieved through the network communication technology, exchange of action information between superior and subordinate protection is achieved, interlocking is achieved, short-circuit fault bidirectional blocking type protection is achieved, action time delay caused by multilevel cooperation is effectively shortened, quick fault isolation is achieved, and fault hazards are reduced. The current situation that most generator circuit breakers do not participate in blocking in site is fully taken into consideration, the fault can be accurately positioned and isolated during power failure transferring and network topological changes, a primary station is not required to participate in the integral protection process, and the workload of the primary station is reduced. The power direction judgment based bidirectional blocking protection method for the distributing line is particularly suitable for line protection of a closed-loop designed and open-loop operated power distribution network with the primary station being not involved in controlling and the generator circuit breaker being not involved in blocking.

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 power direction judgment. Background technique [0002] In recent years, with the development and maturity of wide-area synchronous measurement and digital substation technology, it provides an opportunity to fundamentally improve and improve the performance of relay protection. Therefore, it is an important content to ensure the stable operation of the power grid to examine the existing problems of traditional relay protection in a complex power grid environment and to study new methods of relay protection that can quickly identify and isolate faults. However, there are many problems in the existing wide-area measurement relay protection method. For example, under the current power grid management system, most outlet circuit breakers are not included in the distribution ...

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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