Development Of Real-time Monitoring System For Busbar Contact Resistance Based On ESP8266

The busbar trunking system plays an important role in the power transmission process.The busbar connector acts as a weak link in the entire transmission line and is related to the safe operation of the entire power system.The busbar joint is fixed by insulating bolts.After long-term energization,the busbar joints will oxidize,increasing the contact resistance of the busbar joints,causing excessive temperature rise or even burnout,resulting in serious electrical accidents.Therefore,the development of a low-cost,high-reliability busbar contact resistance real-time monitoring system has a positive significance for the development of the power industry.Based on the analysis of contact resistance detection technology and related equipment at home and abroad,this paper developed a real-time monitoring system for contact resistance of busbar joints based on ESP8266,which mainly includes the following aspects:(1)For the characteristics that the contact resistance of the busbar joint is not easy to detect in real time,the contact resistance prediction of the busbar joint is realized by the soft measurement method,and the least squares support vector machine(LSSVM)is selected as the prediction algorithm.(2)Based on the analysis of the factors affecting the contact resistance of the busbar joint and the busbar joint,the input variables of the predictive model are selected,and the temperature field simulation is carried out by using the COMSOL Multiphysics software combined with the busbar joint analysis model,verify that the input variable is reasonably selected.(3)Develop a real-time monitoring system based on ESP8266,complete the hardware circuit and software design of the lower computer module,and design the data transmission scheme of the lower computer module.The hardware modules of the lower computer module mainly include: MCU control circuit,temperature acquisition circuit,WiFi communication circuit,power supply circuit and the like.The software design of the lower computer module mainly includes: overall program design,temperature acquisition program design,wireless WiFi data transmission program design.The design of the data transmission scheme of the lower computer module mainly includes: ESP8266 WiFi module configuration,wireless router bridging,and packet format definition.(4)Designing functional PC monitoring software with rich functions,realizing bus link temperature,real-time display of contact resistance data,data storage,over-limit alarm and other functions,which is convenient for staff management and maintenance.(5)Design the busbar joint temperature rise experimental system and build an experimental platform to obtain experimental data.The selected LSSVM algorithm is used to establish the contact resistance prediction model of the busbar joint,and the feasibility and accuracy of the real-time monitoring system of the busbar contact resistance are verified by comparison experiments.The experimental results show that the real-time monitoring of the contact resistance of the busbar joint can be realized by real-time monitoring of the real-time monitoring system,and the detection error is low.The established LSSVM model has strong prediction ability and achieved good results.