Research On Temperature Monitoring Technology Of 10 KV Solid Insulated Switchgear

Solid insulated switchgear is important equipment of the power distribution system.When a fault occurs,it will directly lead to a large-scale power outage of the power system,causing huge social impact and economic losses,and seriously affecting the safety and stable operation of the power grid.Therefore,it is particularly important to deepen the concept of smart grids,improve the level of grid automation,and strengthen the status monitoring of all equipment in distribution networks to ensure the safe and stable operation of distribution systems.This article focuses on a company's research and development of solid insulated switchgear with rated voltage of 12 kV and current 1250 A.Firstly,according to the theories of heat transfer in solid media,the steady-state temperature field simulation of the cable terminal joints was performed using ANSYS finite element method.In the simulation software,the cable joint simulation model was established respectively,and its material properties and boundary conditions were set according to the actual operating conditions and physical environment.The numerical results of the temperature field were obtained after reasonable grid division.According to the distribution characteristics of its temperature field and the influence factors of temperature rise of the contact,the method of calculating the contact temperature of the cable based on the partial least square method was proposed.In addition,the temperature field of a solid insulated bus-bar with overheating fault inside the cabinet was studied.A numerical analysis model of the insulation bus-bar was established,the bus-bar boundary conditions were set,and the bus-bar temperature field distribution under normal and abnormal conditions was calculated.Based on this model,a calculation scheme of the bus-bar conductor temperature based on heat transfer theory was proposed.Second,determine the selection of microprocessors and sensors,and use the embedded system of stm32f103zet6 as the core to build the on-site hardware system,including the minimum system unit,temperature acquisition unit,data processing unit,display unit,and communication unit.Based on the research conclusions,an on-line temperature monitoring system for solid insulated switchgear was developed.The working principle of the temperature measurement system was analyzed.In response to the problems arising from the operation of the monitoring system,corresponding improvement measures for heat insulation and anti-jamming were proposed.The related software program and the internal core temperature of the insulated conductor are directly displayed by the built-in formula.Finally,the entire system was installed and tested in the field.All parts were working properly.The accuracy of the simulation and monitoring system was verified through the analysis of test data.The test results show that the wireless temperature measurement system can operate stably and reliably,possesses good thermal stability and certain anti-jamming capability,and can meet the demand of 10 kV solid insulated switchgear for multi-point temperature detection in a high temperature environment.Realize the real-time monitoring of the temperature of high-voltage switchgear.