High precision broad frequency contaminated insulator leakage current sensor

The utility model discloses a leakage current sensor with high precision broadband pollution insulator, relating to an insulator AC leakage current detection sensor. The sensor of the utility model mainly comprises Rogowski coil and an integral amplifying unit and a coaxial cable; the Rogowski coil and the integral amplifying unit are connected through the coaxial cable. The utility model has the advantages of strongly anti-interfering ability, high detecting precision, sensibility up to 8.3mV/mA, bandwidth up to 2Hz to 100kHz, amplitude range of detecting current reaching 10MuA to 450mA; thus the utility model is widely used in online monitoring of insulator leakage current of power transmission line and transformer station and is also used for micro-current or small current monitoring of other electrical and electronic devices such as grounding current, leakage current and harmonic current.