RFID Temperature Measuring System Design for High-voltage Switchgear and Its Reliability

In recent years, the digitalization of electrical equipment has been accelerated with the introduction of the “Smart Grid” concept. A reliable and feasible data sensing and uploading systemˈwhich is a prerequisites for digitization to assist power equipment twins for more in-depth condition analysis and fault prediction. In this paper, a wireless temperature measurement system for high-voltage switchgear which is based on RFID technology is designed to improve the reliability of equipment operation. The author analyzes the working principle of RFID temperature measurement system, optimizes the installation position of the tag and the working mode of the reader, analyzes the temperature characteristics of the tags under the two installation modes through the finite element software, and concludes that the horizontal installation mode has higher measurement accuracy and can meet the demand of the temperature measurement range of the switchgear, which improves the accuracy of the temperature measurement system. Combined with the resonant cavity theory, the two installation methods are analyzed under the influence of metal, and it is concluded that the tag frequency drift is smaller under the horizontal installation method, which improves the stability of the system operation. In summary, the RFID temperature measurement system with horizontal mounting can achieve a temperature measurement accuracy of up to 95%, cause a thermal field distortion rate and field strength distortion rate of no more than 2%, have a lower frequency drift problem, and can be better adapted to the high-temperature environment inside the switchgear and the complex electromagnetic environment, to meet the needs of switchgear multi-point temperature monitoring.