Research On The Monitoring Technology Of Wind Deflection Based On GPS Positioning

Wind deflection discharge often occurs when the transmission line swings under the action of strong wind,in which the air gap between the wire or insulator string and the tower becomes smaller and makes it easier for discharge.In order to prevent the occurrence of wind deflection accident and leave enough margin for air insulation gap,it is necessary to study the wind deflection calculation model and monitoring technology.With the development of modern measurement technologies such as sensors,video monitoring and GPS positioning,the wind deflection state monitoring system can be designed to directly collect wind deflection data,which can avoid various parameter errors caused by traditional calculation models and improve the accuracy of wind deflection calculation.Among all these technologies,GPS location monitoring has the advantages of high accuracy,good module stability,and convenient maintenance,which is suitable for application.This paper designed a wind deflection monitoring system based on GPS positioning technology.Firstly,the suspension point at the end of the insulator string under the action of strong wind can be measured by hanging monitoring module at the end of the insulator string,including GPS mobile stations and communication units.Then,according to the positioning data of the suspension point,the minimum air gap between the suspension point and the tower will be calculated.On this basis,the maximum stress of the tower is estimated,so as to realize the wind deflection state of insulation of the transmission line.The main research contents can be summarized as follows:(1)According to the relevant theories of GPS positioning technology,the positioning information such as positioning time,position and geodetic coordinate system coordinates can be extracted from the original data measured by GPS.Then,by rotating the coordinate system,the positioning data in the rectangular coordinate system can be obtained,which is consistent with the situation of the monitoring site.(2)A calculation model of wind deflection is established which can directly calculate the wind deflection angle and offset using positioning data.Then,the wind deflection problem is abstracted as a rigid body motion problem to deduce the force on the crossbar at the suspension point by using the rigid body dynamics analysis method.(3)The overall scheme of the wind deflection monitoring system based on GPS positioning technology is proposed,and the design content of each module is elaborated,including GPS positioning module,communication module,data processing module and monitoring platform.The system can display the corresponding data,waveform and visual image of the received suspension point location data in the WinForm interface after processing on the VC# platform,which can realize the visual monitoring of the wind deviation state of insulator string.(4)A simple test platform is built to verify the feasibility and accuracy of the wind deflection monitoring system.The results show that the wind deflection calculation model established in this paper can accurately calculate the wind deflection angle and wind offset.