A Station Domain Protection Scheme Based on Logical Information Fusion

Based on the characteristics of highly networked intelligent substation, this paper proposes a protection scheme of station domain based on logical information fusion. Firstly, transformer-centered protection zones are established, and the overall composition of the protection scheme based on logic information is expounded, and fault-tolerant strategies are put forward. The matching criterion between logic value and fault condition is established according to the logic information in the station, such as the direction, action and type of protection. When a fault occurs, the fault state is determined quickly by using logic criterion, the fault area is identified, and the reliability test is carried out through the distribution of logical values. When different faults, signal transmission errors and rejection occur in the station domain, the fault can be located and isolated selectively and quickly through the coordination of logic values in the protection station domain. Finally, a typical fault of transformer protection is taken as an example to verify the correctness of the proposed protection scheme in the station domain.