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Description
The flux-coupling-type superconducting fault current limiter (FC-SFCL) has been proposed to solve excessive short-circuit current in power system. FC-SFCL promotes the breaking capability by connecting two circuit breakers in parallel through two high-coupling coils. Since each coil is made of multiple coil units in parallel, there may be a problem of unbalanced current distribution, resulting local loss and stress concentration, which may cause security risk in operation. Therefore, design for high-coupling coil sets with balanced current distribution is a key part for application. This paper develops a method to design a pair of coil sets in FC-SFCL. Through theoretical analysis and simulation, an inductance calculation method considering structures and parameters of coil sets is obtained. Based on the demand of FC-SFCL, the parameters of coils are optimized by algorithm to achieve its requirements of balanced current distribution. According to the optimization results, the model is built and simulation is done to verify the effectiveness of design method.
