Research on Definition of Short-Circuit Region for Γ-Source Circuit Breaker

This article proposes a method defining area of short-circuit and load step change for Γ-source circuit breaker through deriving the law between the variables of transformation ratio, coupling coefficient, load and the boundary resistance. First, the equivalent circuit as well as the steady-state and transient performance of Γ-source circuit breaker are analyzed. Then, the nonlinear segment equation of the boundary resistance for definition method through theoretical calculation and experimental data is fitted to avoid misoperation opening caused by load step change. Finally, the law between the transformer ratio, coupling coefficient, the load and the boundary resistance is obtained to define an accuracy short-circuit region. The feasibility and effectiveness of the proposed method have been verified using experimental results.