With Xi’annan 750 kV GIS as the project background

the feasibility of removing the opening and closing resistor of disconnecting switch is studied. Seven modes of connection have been chosen and seven ATP-EMTP models have been built to operate every disconnecting switch in the models and the voltage of important nodes is recorded

what’s more

the frequency amplitude domain analysis against those voltage wave shapes with high amplitude is made to make sure whether it is VFTO and then it is checked by the lightning impulse withstand voltage. The results show that after removing the opening and closing resistor

when the disconnecting switches are operated

the voltage on the income casing

the circuit breaker borderupon the operated disconnecting switch

and the disconnecting switch border upon the operated disconnecting switch and connected on the same bus with it are relatively high

but they are also under the lightning impulse withstand voltage of the equipment. So a conclusion could be drawn that from the point of insulation coordination

the opening and closing resistor of disconnecting switch in 750 kV GIS could be removed.