Simulation of dry-type air-core reactor under strand-to-strand short circuit fault

With the development of power industry, dry-type air core reactor has been more and more widely used, and more and more safety accidents are caused by its faults. In theory, the dry-type air core reactor with multi strand parallel winding can effectively avoid the occurrence of inter turn short circuit fault, but there are still faults in the actual operation, so there is a lack of research on the inter strand short circuit fault of the reactor. In order to study the influence of inter strand short circuit fault on reactor, a field circuit coupling finite element simulation model was established to simulate the spatial magnetic field and current distribution characteristics of reactor under normal operation and inter strand short circuit fault. The results show that the working state of the reactor hardly changes when the same turn inter strand short circuit fault occurs; the different turn inter strand short circuit fault will significantly affect the space magnetic field near the short circuit turn, and the closer the short circuit point is to the end, the more serious the fault is; the different turn inter strand short circuit fault will significantly change the current of the reactor, especially the real part current. The research work fully reveals the change of operation characteristics of reactor under inter strand short circuit fault, and provides a reference for the occurrence and diagnosis of reactor fault.