Design method for pi-type transient model of disconnecting switch

The invention provides a pi-type transient model design method for an isolating switch, which comprises the following steps of: establishing a pi-type transient equivalent circuit in an on-off process of the isolating switch, calculating fracture equivalent capacitance, calculating fracture equivalent resistance, calculating own equivalent capacitance, and finishing design of a pi-type transient model in the on-off process of the isolating switch. According to the method, the pi-type transient model of the disconnecting switch on-off process is designed on the basis of data actually collected in the disconnecting switch on-off operation process of the transformer substation in combination with a calculation method, the transient characteristics of the disconnecting switch on-off process can be efficiently, accurately and reliably simulated, design and protection measures are optimized as soon as possible, and the design efficiency is improved. The method is of great significance for guaranteeing safe operatio