This product is composed of four parts: a high-frequency partial discharge sensor, a high-frequency partial discharge receiver unit, a three-in-one switchgear partial discharge sensor, and a three-in-one wireless receiver unit. The product utilizes a high-performance industrial microprocessor, which boasts strong anti-interference capabilities. It employs built-in ultrasonic, high-frequency, and ground wave sensors to monitor partial discharge signals of the equipment. Suitable for monitoring partial discharge signals during the operation of large electrical equipment, as well as partial discharge caused by insulation defects in switchgear and space discharge inside distribution cabinets. The product is compact in size, exquisitely designed, and convenient for use in field environments.