Research on inter‐turn short‐circuit fault of power transformer by using third harmonic

The inter-turn short-circuit fault of a power transformer has large current in the winding, which will cause serious heating and deformation winding may threaten safety transformer. Under this background, paper proposes scheme based on open-delta voltage monitoring identification short circuits transformers. First, mathematical modeling analysis principle transformers are carried out, expression to characterize with different turns given. Second, magnetic field distribution under conditions, relationship between eigenvalue number etc. Finally, experimental study verifies correctness proposed scheme.