In this paper, thermal and structural analyses based on numerical method have been conducted to develop a dry type current limiting reactor which can mitigate the fault current. The current limiting reactor is an effective device to reduce the breaking capacity of circuit breakers in spite of the growth of electric loads.
Temperature rise analysis of the dry type reactor is required and important to suppress the excessive temperature rise over temperature limit of an insulating material, and structural analysis for short current forces of the reactor is required to verify the structural integrity in fault current conditions. For the thermal stability of reactor, thermal-fluid analysis has been carried out to predict temperature rise of reactor winding.
Through the analyses, the optimal thickness of fiber-epoxy composite was determined to secure the structural integrity against the short current force by coupled electromagnetic-mechanical analysis. The numerical analyses results have been verified by conducting performance test for the prototype reactor.