A new method of raising the intensity of self-restoring insulation in circuit breaker

The physical process of when a circuit breaker cuts out the arc of short-circuit current in a power system is analysed when the neutral point in a power system grounds through a special nonlinear grounding resistor. This method can restrict the speed of short-circuit current which flows through at zero value, thereby raising the intensity of self-restoring insulation and enhancing the ability of cut-out of the short-circuit current in circuit breakers. The calculation results presented agree fairly well with the authors´ test figures