Research On Multi-parameter Data Fusion And Icing Recognition Of Wires

Transmission conductor ice coating is one of the important disasters affecting the safe operation of the power transmission grid,ice ice may cause line tripping,hardware damage,the severe situation leads to transmission tower and conductor wire,ice disasters seriously threatens the stability of power grid safe operation.Online monitoring of the severity of the ice cover can reflect the situation and development trend of wire icing,which can reduce or avoid transmission accidents.In recent years,with the yunnan power grid to build large-scale ice online monitoring system of transmission line,and to provide technical support for transmission lines ice melt,this article from the ice and meteorological factors(temperature,wind speed,relative humidity),conductor temperature data,verify the ice thickness calculation theory,comparative analysis and practical view of artificial ice,ice thickness is established and the conductor temperature,environment temperature,wind speed,relative humidity,the relationship between,to the actual field data analyses the correlation,this paper main research work:(1)analyze the influence of icing on static load,stress and sag of wire,and analyze it with practical examples;The influence of the tension of the conductor,the displacement of the insulator and the change of the arc of the wire when the adjacent wire is not evenly covered;From transmission lines in the vertical plane statics equations,when the vertical plane under the action of wind,have certain of deflection form monsoon was flat,and then establish in monsoon plane statics balance equation,the calculation model of ice thickness is deduced.(2)Collect and collate the monitoring data of the main ice-coverage period(December 18,2015 to February 17,2016)of a 110 kV transmission line in Yunnan Power Grid: insulator string tension,inclination angle along the wire,and wind perpendicular to the wire direction Declination,based on the ice thickness calculation model in Chapter 2,calculates the real-time ice-covering thickness of the ice-covered period,and compares it with the artificial ice-observing value.(3)analysis of conductor temperature,the impact of meteorological factors on the ice,using grey correlation analysis method,to calculate the ice thickness andconductor temperature,environment temperature,wind speed,relative humidity and so on correlation between meteorological factors,the results show that the conductor temperature,environment temperature and relative humidity,wind speed and the thickness of ice there is a certain relationship.Combined with the correlation analysis results,it is found that the single parameter can determine the icing condition of the transmission line and the accuracy is low.In the case of wire temperature,ambient temperature,wind speed and relative humidity,the icing condition is analyzed and the accuracy is high.Finally,based on the fuzzy theory,the accuracy prediction of multi-factor parameters and ice thickness is established,and the results show that the prediction accuracy is higher.The data collected in this paper are collected from the ice monitoring system of110 kV transmission line of zhaotong power supply bureau in yunnan province.