Monitoring System Of High-voltage Transmission Line Junction Temperature Based On LPWAN

Due to the increase of contact resistance,insulation aging,overload and other factors,high-voltage transmission line junction temperature is often too high,which may cause the junction to break,or even lead to local overheating and fire,affecting the safe and stable operation of the power system.Therefore,it is significant to design a set of monitoring system for transmission line junction temperature to ensure the reliable operation of transmission lines and avoid power failure and fire.In order to realize remote acquisition,upload and monitoring of temperature information of wire connector,an architecture scheme is proposed to use the latest Low-Power Wide-Area Network(LPWAN)technology to realize the wire-connection temperature monitoring network,for the 220 k V transmission line.It breaks through the simple sensor monitoring and fills a blind spot of power data monitoring.This monitoring system includes CC2530 and STM32 microcontroller,fiber optic temperature sensor,Zig Bee module,Lo Ra module,NB-Io T module,solar power supply system and upper computer monitoring part.The information acquisition terminal will upload the collected data to the human-computer interaction interface through Lo Ra and NB-Io T communication,realize remote monitoring,and alarm the abnormal points,so as to timely deal with the fault.The experimental results show that this scheme can accurately upload the data collected by the sensor to the PC terminal and the mobile terminal,and can realize the function of timely alarm.The power supply system can work in the outdoors continuously and effectively,and has the characteristic of low power consumption.The main work of this paper is as follows:(1)Reliable power supply solution.This paper adopts a power supply scheme combining solar energy and lithium battery,including solar panel,lithium battery and solar lithium battery controller.And with overload protection,short circuit protection,overrelease protection,overrelease recovery and other management protection circuit,to ensure the continuous operation of the monitoring system.(2)Effective collection of temperature information.The acquisition terminal adopts the solution of "CC2530+fiber temperature sensor".The sensing device is not affected by high voltage and strong electromagnetic field environment.The temperature information collected is gathered to the corresponding gateway node through Zig Bee AD hoc network.(3)Long-distance transmission of data.Through Lo Ra multi-hop networking technology,each gateway node realizes data relay perception and inter-network sharing.The main node is set at the end of the network to transmit data to the remote monitoring center by NB-Io T.(4)Host computer real-time monitoring and alarm.The man-machine interaction interface adopts the "USR Cloud" management system.By adding devices,real-time data display and alarm functions can be realized,and historical data information can be viewed.(5)Overall low power performance.Through the construction of each part of the hardware circuit and the design of the software part,the system can run alternately between the work and sleep state,in order to achieve the purpose of low power consumption and extend the service life of the monitoring system.