Condition Monitoring Technology for Temperature and Strain Status of Disconnector Based on SAW

Disconnector is an important equipment for power transmission and distribution in the power system, and its working state has an important impact on the safety and reliability of the power system. However, due to the complex and changeable environment of the Disconnector, its working state is often affected by uncontrollable factors, and it is urgent to monitor its working state in real time. In this paper, based on the theory of SAW sensing, strain and temperature will cause the frequency shift of SAW devices, and a scheme of on-line monitoring system for disconnectors based on wireless passive SAW (SAW) sensors is proposed. Through the finite element simulation and test of the stress and strain of the disconnector, a SAW sensor suitable for the temperature composite detection of the disconnector’s finger strain gauge is developed. Practical tests show that the stress measurement sensitivity of the contact finger strain is 220 Hz/uε, and the temperature measurement sensitivity is10 kHz/uε, which can effectively discriminate the working state of the disconnector. It has important application prospects on the online detection of power system equipment.