Aiming at the disadvantage of existing temperature measuring system for high voltage switchgear

a remote online temperature monitoring system is designed. The system consists of six SAW temperature sensors and a wireless interrogator based on principle of radar

the interrogator realize temperature measurement by transmitting high frequency（ 497

503 MHz） excitation signal to the sensor and receives the echo signal with the information of temperature

at the same time

the system can send SMS alarm message and reply the workers’ messages used for temperature inquiry or changing the system parameters by GSM module. Test results show that the system works stably and has the capability of strong anti-jamming

whose measurement error is within 0.

5 ℃.The interrogator powered by 10 Ah lithium battery can work continuously for 35 days and is more suitable for temperature monitoring of high voltage switchgear.