AC voltage sensor is the key component in the integration of primary and secondary equipment in a distribution network. Therefore

we carried out in-depth analysis and research on the AC voltage sensor technology which may be used as the primary and secondary fusion of equipment in distribution network. On the basis of the performance and characteristics of the AC voltage sensor based on the principle of impedance voltage division

the parameter analysis formula and determination principle of resistance voltage divider type

capacitance voltage divider type and resistance capacitance voltage divider type AC voltage sensor were deduced

respectively.Moreover

the parameter determination principle

error estimation formula and technical solution of error control were put forward

the rationality and feasibility of the proposed technical solution through rigorous derivation were demonstrated

and the simulation and tests were carried out. The research results show that

In order to eliminate the influence of stray capacitance to the ground

it is necessary to take good shielding measures for the resistance voltage divider type voltage sensors. However

it is difficult to take shielding measures because the sensors need to be encapsulated into the pole of the switch. The capacitance voltage-divider-type AC voltage sensors have advantages in anti-stray capacitance to ground

but are lacking in the transient characteristics.The sensors can be used as voltage sensors in primary and secondary fusion distribution network when equipped with special "impedance transformation" circuits. It is concluded that capacitance divider-type and paralleled-type resistance voltage-divider are suitable for primary and secondary fusion ac sensors.