SF6 circuit breaker opening and closing coil insulation fault assessment method

The invention relates to the technical field of SF6 circuit breaker opening and closing coil insulation performance evaluation, and discloses an SF6 circuit breaker opening and closing coil insulation fault evaluation method, which comprises the following steps: establishing a two-dimensional axial symmetry model of an opening and closing coil winding, and calculating a capacitance and inductance matrix of the winding through the energy of an electrostatic field and a magnetic field; and based on the single winding equivalent model of the transformer, a high-frequency equivalent circuit model of the opening and closing coil winding is established. Excitation is applied to the head end of the circuit model, and a response curve can be measured at the tail end of the circuit model. And setting short-circuit faults at different positions and in different degrees to obtain a corresponding characteristic curve, calculating the area value of each hundreds of points as an input parameter of the BP neural network eva