Partial discharge（PD） detection in gas insulated substraction（GIS）is very important to guarantee its safety and reliable operation.In order to overcome the disadvantage of traditional partial discharge detection sensor

a kind of bowtie antenna sensor on the basis of research on PD sensor in three-phase-common GIS is designed.Theoretical calculation and actual test data show that the bowtie antenna inner sensors has outstanding property

in UHF its frequency response property is very well

and can meet demands of PD detection in three-phase-common GIS.The PD test comparison of bowtie antenna sensor and outlay micro strip patch sensor is carried out in device of imitation defect.