Recent research results on wireless passive acoustic sensors for smart grids application

The use of wireless SAW sensors for temperature monitoring of electric equipments has become a more favored choice than its counterparts because of the unique characteristics. This paper introduces some research results in SAW wireless temperature sensors. The sensor designs using double resonating elements and a new dual-frequency reading system where the double sensing elements are interrogated simultaneously are implemented. A new encapsulation of the sensors is designed to be in facility clamped on surface of the breaker contacts and the outlet cable joints. An effective error correction method for continuous frequency readout errors is also presented.