For the distribution lines on same pole in a distribution network with neutral grounding

when single-phase grounding fault occurs in one system

the neutral point voltage transmits to the other normal system via coupling capacitor of distribution line on the same pole

and the voltage may result in the Peterson coil misoperation.In order to solve the problem

the main factors that affect the neutral point displacement voltage of the normal system are analyzed theoretically in this paper

the variations of the factors are obtained

and models of respective cable feeder lines substation and overhead lines substation are established.Therefore

the neutral point voltages of single-phase grounding fault and normal state are obtained by the models.If the length of the distribution lines on same pole is less than 5 km and other system parameters are set suitably

the Peterson coil misoperation induced by coupling capacitor doesn’t occur in the system.