Ultrahigh-frequency sensor for detecting GIS partial discharge

The utility model relates to an ultrahigh-frequency sensor for detecting GIS partial discharge, belonging to the technical field of power equipment detection instruments. The ultrahigh-frequency sensor comprises an outer shielding shell (1), an inner shielding shell (2), an inner shielding shell cover plate (3), an antenna reflecting plate (4), an antenna (5) and an antenna baffle (6), wherein the inner shielding shell is arranged in the outer shielding shell; the inner shielding shell cover plate is arranged in the inner shielding shell; the inner shielding shell is in a multi-cavity structure; the antenna reflecting plate, the antenna and the antenna baffle are arranged below the inner shielding shell cover plate; the antenna is arranged between the antenna reflecting plate and the antenna baffle; and the outer surface of the antenna baffle is in a cambered surface structure. The ultrahigh-frequency sensor provided by the utility model acquires an ultrahigh-frequency signal generated by GIS in the partial discharge, and can effectively avoid low-frequency interference signals existing on a site; a coupling agent is not required, the measurement is simple and easy to implement, and the working efficiency of GIS polling can be greatly improved; and as a dual-shielding structure is arranged, the anti-jamming capability is strong.