Partial Discharge Sensor

The high-frequency partial discharge sensor employs the Rogowski coil approach, in which multiple conductive coils are wrapped around a toroidal magnetic core material. The high-frequency alternating electromagnetic field generated by the flow of high-frequency current through the magnetic core's center induces an induced voltage on the coils. The sensor's measurement circuit is not electrically connected to the device under test, ensuring a non-intrusive approach that does not require the equipment to be taken out of service. By utilizing an online partial discharge monitoring system to observe and track changes in partial discharge activity over time, one can predict and timely replace high-voltage cables or their associated components before faults occur. High-frequency partial discharge sensors are extensively used in power systems, including monitoring of ultra-high frequency partial discharge in electrical devices within substations, such as switchgear, GIS, and high-voltage equipment. By continuously monitoring and analyzing partial discharge in real-time, these sensors can promptly identify and address potential electrical faults, thereby ensuring the stable operation of the power system.