according to the requirements of online temperature measurement and monitoring of switch cabinets, ring main units and power transformers, the system uses the monitoring and analysis of contact-type wireless temperature measurement to capture the abnormal operations of the equipment, find the early signs of equipment accidents in time and take effective measures to prevent the occurrence of serious accidents. the system is classified into two major types: (1) jc-5b passive wireless temperature on-line monitoring system is a passive wireless temperature monitoring system for electric power based on uhf rfid sensors. the temperature sensing device works by collecting the energy of electromagnetic waves and returns the data to the collector in a wireless way. under the premise of not affecting the insulation and safety performance of the power equipment in the least, the need for real-time temperature monitoring of the key nodes of the power equipment is realized. (2)jc-5c ct power-taking type passive wireless temperature online monitoring system is based on energy harvesting type self-powered wireless temperature sensors of high-voltage electric field energy. in the real sense, it realizes maintenance-free, self-powered high-precision monitoring with electrical isolation and without current in the main loop.