The air core reactor’s inductance parameters are influenced by its turn-to-turn failure. Accurately calculating the change of inductance of air core reactor is significant for evaluating the fault location. In order to simulate the turn-to-turn short circuit failure of the reactor

inductance parameters of the reactor are obtained in this paper. The analytic method and the finite element method are employed to calculate the electromagnetic parameters of the drytype air-core reactor. And the changes in inductance value of the air-core reactor are also obtained by taking different short- circuit location into account. It is indicated that the induction value decreases when the middlelocation fault moves from the inner layer to the outer layer

and that the induction value increases when the fault location moves from the middle position to two ends. This work can provide a guidance for the proposition of the test method locating the turn-to-turn short circuit in the reactor.