Insulator: wire insulation is fixed to and suspended in the tower on the object. Transmission line insulators are commonly used: disc ceramic insulators, disc-shaped glass insulators, composite insulators Rod. 
 (1) disk-shaped ceramic insulators: insulators made of porcelain, there is deterioration of the high rate of detection of zero value required to maintain a heavy workload. Face flashover lightning and string out the accident prone, has gradually been phased out. 
 (2) disk-shaped glass insulators: blew a zero value, but blew rate is very low (usually the very few.) Maintenance without detection, after the glass pieces in case blew up its destruction of residual tensile mechanical strength of 80 is still more than able to ensure the safe operation of the line. Face flashover lightning and accidents will not happen out of string. In the Ⅰ, Ⅱ grade polluted area has been widely used. 
 (3) Composite Rod Insulators: with anti flashover performance, light weight, high mechanical strength, less maintenance, etc., and above grade Ⅲ pollution in the area has been widely used. 
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