Intelligent electronic device using transient fault information and relay protection method

Abstract

The invention relates to an intelligent electronic device using transient fault information and a relay protection method. The intelligent electronic device comprises a distance-measuring/wave-recording module, a protection module and a measuring/controlling module, wherein the distance-measuring/wave-recording module is respectively in communication connection with a process layer and a station control layer through a process layer communication module and a station control layer communication module, and the protection module and the measuring/controlling module are respectively used for carrying out fault identification, line protection and fault distance-measuring/wave-recording according to transient fault information uploaded by the process layer; an effect that the modules carry out mutual communication and external communication is achieved mainly by adopting a 100 Mbps Ethernet, thereby realizing the high-speed exchange and parallel processing of data; and the protection module identifies the transient fault information such as fault direction, polarity and distance in an extremely short time after a fault occurs, and forms a pilot protection through adopting a 2-out-of-3 logic, thereby both realizing the rapid action of the protection function, and improving the reliability of the action. The intelligent electronic device and relay protection method disclosed by the invention achieve an effect of multifunction integration, and are applicable to the existing intelligent substations; and meanwhile, according to the invention, the protection performance and the distance-measuring accuracy are improved, and the device cost and the operation and maintenance costs are reduced.

Description

technical field [0001] The invention belongs to the technical field of power system automation, and relates to an intelligent electronic device and a relay protection method utilizing transient fault information. Background technique [0002] Reducing the action time of relay protection is one of the effective measures to increase the transmission power of transmission lines and enhance the transient stability of the system. Accurate identification, processing and utilization of transient fault information can correctly determine the fault in a very short time after the fault occurs, usually only 1~3ms, so the ultra-high-speed action of relay protection can be realized. However, the protection principle adopted by the relay protection devices widely used in the field is based on the power frequency electrical quantity, and filtering and other methods are usually used to eliminate the influence of the transient process on the protection, and the transient fault information is...

AI Technical Summary

Problems solved by technology

However, the protection principle adopted by the relay protection devices widely used in the field is based on the power frequency electrical quantity, and filtering and other methods are usually used to eliminate the influence of the transient process on the protection, and the transient fault information is often regarded as Filtered out for harmful interference, which prolongs the operating time of the protection

However, the relay protection that only uses transient fault information is still at the stage of principle and algorithm research, and it is difficult to be practical

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