Goncharov E. Improving Operational Performance of Superconducting Fault Current Limiter of the Inductive Type

The object of study - the electromagnetic processes in the superconducting short-circuit current limiter of inductive type. The purpose of research - to develop theoretical and scheme design to increase the short-circuit current limiter settings by using of superconducting elements of the second generation. Methods: analysis of the magnetic flux distribution was carried out using the finite element method; equivalent permeability of the high-temperature superconducting coil was determined by integrating the magnetic resistance in view of the geometry of the magnetic flux passing portions numerical methods in computing environment; to develop a mathematical model based on the solution of differential equations of the transition process in the mains in the event of a short circuit used methods of the theory of electrical machines. Theoretical and practical results: mathematical models of transient inductive type superconducting current limiter, which together allow a full analysis of current-limiting characteristics of the definition of the necessary critical parameters. Scientific novelty: for the first time developed a structural scheme of an inductive high-temperature superconducting short-circuit current limiter with the superconducting coil and the screen with a cryogenically cooled entire magnetic system; improved methodology for calculating the design parameters of superconducting short circuit-current limiter, built on account of the voltage drop coefficient, critical parameters of the superconducting screen and coil; improved method of calculating the equivalent relative permeability of the superconducting magnetic coil, which takes into account geometrical parameters of the wire and the winding method thereof, which simplifies the calculation of the magnetic field in the nominal mode, and to determine the ratio of the voltage drop; has been further developed mathematical model of the transition process in the superconducting current limiter inductive type in the event of a short-circuit current, which takes into account the loss of the superconducting phase of the winding and screen. Degree of implementation: methods of calculation parameters current limiter implemented in enterprises Ltd "RAIL-TECHNIC" (Lviv), PJSC "Kharkiv Machine Building Plant "SVET SHAKHTYORA" (Kharkiv). The results obtained in the dissertation used in the educational process of the department "Electric vehicles" and "Electric stations". Scope of use - electricity industry, in research institutions and in the educational process.