Compensation Method for High Voltage Switchgear Temperature Measuring System with Dual Surface Acoustic Wave Chip

The temperature measurement system for switch gear based on surface acoustic wave (SAW) is gradually mature. The feedback frequency of the SAW chip represents the temperature measured by the sensor. However there is a common issue that the SAW chip feedback frequency will appear a deviation in temperature measurement after running for a period. This paper firstly research on the phenomenon of frequency deviation, then provide a method to compensate this deviation. Theoretical analysis and experimental results show the effectiveness of this method.