Distribution insulators include porcelain pin insulator and porcelain line post insulator and so on at present. Vertical porcelain line post insulator models have ANSI 57-11, ANSI 57-12, ANSI 57-13, ANSI 57-14, ANSI 57-15 and ANSI 57-16 according to international ANSI standard.

Vertical porcelain line post insulator arc requirement:
In service care must be given to protecting the end fittings of Vertical porcelain line post insulator from the melting effects of power arc currents. If an arc is allowed to root on the end fitting of a Ceramic line post insulator, adjacent to the porcelain coating, the heat of arc is likely to cause sufficient damage to allow water ingress. This will result in failure of the porcelain line post insulator and the Vertical porcelain line post insulator should be replaced. Accordingly all porcelain line post insulators should be fitted with carefully designed arc protection devices.

Vertical porcelain line post insulator flashover voltage:
A flashover arc is a breakdown and conduction of the air around or along the surface of the insulator, causing an arc along the outside of the Vertical porcelain line post insulator. They are usually designed to withstand this without damage. Flashover voltage is the voltage that causes a flash-over arc.

Most high voltage Vertical porcelain line post insulators are designed with a lower flashover voltage than puncture voltage, so they flash over before they puncture, to avoid damage.

Relative Articles:
◆63.5 mm Rod Diameter vertical Post insulator
◆vertical Tie-top and horizontal clamp top line post insulator
◆Horizontal and vertical porcelain line post insulator
◆ANSI 57-14 porcelain line post insulator,vertical line post insulator
◆ANSI 57-12 porcelain line post insulator,vertical line post insulator
◆ANSI 57-11 porcelain line post insulator,vertical line post insulators