Prediction Of Electric Field Disrortion And Flashover Voltage Of Algae-covared Insulotors Based On SVM

With the increasingly serious environmental pollutions and voltage level,composite insulators are more and more widely used in power system,and as a key component in the transmission and transformation system,its operating state is directly related to the safe and stable operation of the power system.In recent years,biological attachments have been found on composite insulators operating in some warm,hot and humid areas of the world,of which algae are the most common.In wet environment,the algae attached to the insulator surface affects its voltage distribution characteristics,and has a great effect on the protection of dirt and flash espresso on transmission lines.In this paper,ANSYS simulation calculation software is used to establish a 110 k V composite insulator two-dimensional electric field calculation model,and calculate and analyze the effect of algae growth location,weather conditions,the formation of drying zone and other factors on the distribution of insulator electric field.Integrated lightning insulators have both lightning protection and insulation support dual role,compared with ordinary insulators,in wet environment insulator-type limiter surface algae on the surface of the umbrella skirt electric field and flash voltage has a greater impact.Ansoft simulation calculation software was used to establish a 2D electric field calculation model of 35 k V insulator limiter,and to study the effect of surface algae growth position,growth conditions,weather conditions and other factors on the distribution of electric field on the surface of the umbrella skirt.Based on the simulation experiment,the method of insulator flash voltage prediction based on SVM is proposed,and the prediction of flash voltage is realized by using the electric field characteristic quantity as the input of the model.Through the research of this paper,it shows that: for 110 k V ordinary composite insulation electric field distribution is "U"-shaped distribution,in the junction of the wire end sheath and gold equipment appeared electric field peak;In the case of rainy days,the great value of the junction of the wire side gold and the umbrella skirt did not change significantly,the low-pressure end field strength increased significantly,the algae growth position and the water belt junction of the electric field distortion is serious,the risk of flash;The strength of the electric field at the junction of the low-pressure umbrella skirt sheath was reduced,and the risk of flashing is low.Integrated mine-proof insulator electric field is a "W"-shaped distribution,compared to the limit ingress segment,the insulation segment bears a larger voltage and field strength;The distribution of electric field and clean umbrella skirt is about the same,but the ball nest field is strongly reduced,in rainy days,the great value of the junction of the wire side gold and umbrella skirt has no significant change,but the strong growth of the insulation section field is large,the algae growth location and the water belt junction of the electric field distortion is serious,the risk of flash.The conclusion of this paper provides a theoretical reference for the protection of composite insulator outer insulation in warm,hot and high humidity areas.Using the support vector machine to establish the mapping relationship between environmental conditions and flash voltage,the results show that the simulation results and prediction results are basically the same,and this paper provides a new way for insulator flash voltage prediction in complex environments.