Experimental Study On The Impact Of Atmospheric Parameters On The External Insulation Of Air Gap Based On Multivariate Statistical Analysis

Along with the power grid development strategy such as “west-to-east powertransmission” and “The national electric power network” vigorously implemented in recentyears, a lot of power resources need to be transported across the areas of complex atmosphericenvironment. One of the key technology issues is how to solve the external insulationproblem of power transmission lines and substations in complex atmospheric environmentwhen being designed and operated. The external insulation of electrical equipment, such as airgap and its surface, is closely related to atmospheric environment. Therefore the study on theimpact of atmospheric conditions on the external insulation of air gap is of vital realisticsignificance.Eight automatic discharge monitoring devices were installed in different regions ofGuangzhou for this study, which could measure the discharge voltage of air gap and real-timeatmospheric conditions such as temperature, humidity, wind speed, and atmospheric pressure,etc. Based on the large amount of field data, combined with the artificial climate chamberdischarge test, the variation laws of air gap discharge voltage and various atmosphericparameters under natural conditions are summarized. Moreover, the impact of the singleatmospheric parameter on the discharge voltage is analyzed.Many indexes with complex relationship, which influence each other indicators, areincluded in the monitoring data. In order to overcome these, this paper for the first timeapplies two methods of multivariate statistical analysis--Gray Relational Analysis andPrincipal Component Analysis to the study on the impact of atmospheric conditions on air gapdischarge.Based on GRA, the grey correlation degrees from the parameters of atmosphericconditions to the air gap discharge voltage are computationally analyzed and ranked.Furthermore in this paper, the strength of the influence of single parameter on dischargevoltage are indicated.Based on PCA, the meteorological composite indicator Y is pointed out. The influencerules of Y on air gap discharge voltage, especially when the discharge voltage drops seriously,are analyzed and summarize, which could provide a reference for the further study of theinfluence of meteorological elements on the air gap discharge voltage.