| Wire galloping causes serious harm to the safe operation of the power transmission and distribution system. Scholars at home and abroad have done a lot of research work and achieved fruitful research achievements in transmission line galloping and monitoring, but because of the complexity of the mechanism of galloping and diversity of weather environment, terrain conditions and transmission line parameters, wire galloping still causes accidents frequently. In this case, it has very important engineering application value to reserch the transmission line galloping and online monitoring technology. In this paper, it carries on the analysis research on the transmission line galloping aerodynamic parameters simulation and galloping on-line monitoring technology.Based on the incompressible navier-stokes equation of the aerodynamic mechanics theory, using the turbulence model, calculating the flow field and aerodynamic parameters in different cross sections of the conductor arounded by ice, this paper preliminary analysis the influence law of different wind speed and Angle of attack to conductor without ice and with different ice covering shape. The result shows that the resistance of conductor with no ice increased by the wind speed while the mean of the lift power has no obvious change, but its Vibration amplitude and frequency increased by the wind speed.The strength of the D-shaped cross section formatted in the downstream of the vortex structure is bigger than elliptic and crescent shape, and the dissipasion of it is slower. The shape of the cross section causes great influence to the happen of the wire galloping. Wire with D-shaped cross section is more impossible to gallop than it with elliptic and crescent shape, the galloping interval is between92and96degree.Based on the technology of motion attitude sensors,3G communication and CT power terminal power supply, this paper designs a set of on-line monitoring system for galloping which is constituted by one monitoring device installed in the tower standing and four installed terminal in the conductor. Monitoring terminal includes the terminal control system of ARM-CORTEX-M3micro controller, intelligent protection CT induction power supply, sports attitude sensors and RF radio frequency module; Monitoring master station comprises ARM-Cortex-M3micro controller, power supply module,3G module, RF radio frequency module, environment temperature and humidity sensor, the wind sensor, sunshine radiation sensor and atmospheric pressure sensor. This article writes the corresponding hardware drivers, and designs the monitoring device shell and installation process.This paper does testing analysis about the designed transmission line galloping of on-line monitoring device in the lab erection experimental platform. Test results show that the short-range radio frequency Zigbee communication, CT induction power supply, precision of attitude sensor, solar battery duration,3G module of the monitoring device performance is reliable, and it can meet the requirements of monitoring the wire galloping. |
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