The utility model discloses a measuring device is carried out to ground induced voltage to transient state for being directed at power equipment, include: metal electrode, insulating medium, high frequency device, insulating casing and electromagnetic coupling circuit, metal electrode is connected through insulating medium with electrical equipment's metal casing, and on insulating medium laminating and electrical equipment's the metal outer wall, metal electrode is used for passing through insulating medium with electrical equipment's metal casing and forms electrical equipment 0, high frequency device, with metal electrode is connected for suppress high frequency electric magnetic wave signal refraction reflection, avoid the voltage signal who gathers to receive special high frequency electric magnetism interference of waves, insulating casing is wrapping up metal electrode, insulating medium, high frequency device and electromagnetic coupling circuit for avoid interfering signal such as human static to exert an influence to measuring result, the electromagnetic coupling circuit is established ties with equivalent capacitance for coupling and measurement are carried out to groundinduced voltage signal to transient state to power equipment partial discharge produces.