Selection of insulator type

number of insulator string and air space are the main basis of transmission line insulation coordination.According to the demand for transmission pilot project in severe icing area

this paper summarizes a large number of domestic and foreign research results and test data

compares icing flashover characteristics for a wide range of large-tonnage porcelain and glass insulators

and selects insulator model and string-type in severe icing area.The results show that:the icing flashover voltage of XZP-300 porcelain insulator string is higher than XZP-210 insulator string

the icing flashover voltage of LXZP300 glass insulator string is higher than LXZP-210 insulator string;the icing-bridge velocity of insulator string connected with alternately large and small diameter sheds or V-insulator string slows down

saturation of icing is higher than conventional icing hanging string.In order to improve the anti-flashover characteristics of icing insulator string

it can use the combination of V-insulator string and large-tonnage porcelain and glass insulators which are connected with alternately large and small diameter sheds in severe icing area.