Insulator PDF
Suspension insulator
The definition of suspension insulator:
Used on transmission and distribution line, suspension insulator is one of the most frequently used insulators. Suspension insulators differ from other kinds of insulators when used on the high voltage line.
The structure of the suspension insulator:
Suspension insulator can be divided into composite suspension insulator and porcelain suspension insulator. It is consisted of porcelain unit or composite unit, iron cap, steel pin. Steel pin of the suspension insulator can be with zinc sleeve type and without zinc sleeve type. Zinc sleeve types have better anti-oxidation ability. The three parts are assembled with porcelain part, and when it comes to composite insulator the three parts are crimped together.
The classification of the suspension insulator:
According to the way of the end hardware connection way, it can be classified as ball & socket type insulator and clevis & tongue type insulator.
According to the pollution status of the environment it can be classified as common type suspension insulator and anti-pollution suspension insulator:
There are three kind s of anti-pollution disc suspension insulator, this classification is made according to the different shape of the porcelain unit or the composite long rod insulators unit: Double sheds type, Bell shaped, Aero dynamic type.
And every type has its own advantage:
The double sheds type of disc suspension insulator has big creepage distance. There are no ridges under sheds, so it has better self-cleaning quality; different from the double side type ones, the bell shaped of suspension insulator has big ridges, which can increase creepage distance, it has better anti fog ability. The Aero dynamic type of anti-fog suspension insulator has bigger shed diameter, it can prevent bird damage and ice through the whole insulator string.
The composite suspension insulator does not have the same classifications of shape as disc suspension insulators, one kind of composite insulator has the same size of shed, and the other kind has different sizes of shed.
