When partial discharge occurs inside the cable, high-frequency current propagates along the grounding wire to the earth. By installing sensors on the grounding wire, detection of high-frequency current signals is achieved for partial discharge. The sensors operate using the Roos coil method, where the high-frequency current passing through the core center induces a high-frequency alternating electromagnetic field that generates induced voltage on the coil. There is no electrical connection between the sensor's measuring circuit and the measured current, making it a non-intrusive detection method. The equipment under test does not need to be shut down.

This product utilizes imported magnetic cores, a specialized compensation cutting process, and an internal high-frequency compensation algorithm, ensuring a smooth and stable output within the frequency band. Its performance exceeds that of other domestic companies' products, and is slightly better than Bitoin and Omikron's offerings.

The following image shows the performance chart of our products tested at the Beijing Electric Power Research Institute.