The JCP - 200 Switchgear Partial Discharge On-line Monitoring Device is a partial discharge monitoring product for switchgears independently developed by Nanjing Jiuwei Measurement and Control Technology Co., Ltd. In a single monitoring terminal device, it simultaneously has three detection methods and is applicable to the on-line partial discharge monitoring of 10-35kV high- voltage switchgears. The switchgear partial discharge on-line monitoring device consists of a monitoring terminal and a wireless data concentrator. The monitoring terminal integrates ultrasonic (AE), transient low-voltage (TEV), and UHF (ultra-high-frequency) sensors, covering the full - frequency - band partial discharge signals. It adopts a magneti-adsorption surface - mounting method, is powered by a battery, uses wireless communication, and has no external wiring. The terminal surface is equipped with a working status indicator light and a switch button.