There is 1 essential function of substation construction , that is called the switching function, which is made use of as a connecting and disconnecting of transmission lines or some other elements from the system. In other words, the wire involving earthing lead and electrical device or appliance is referred to as earth continuity conductor. Suspension insulators are allowed to swing so that they can take up the position exactly where mechanical stresses are minimum. When there are defective insulators in an insulator string, the voltage distribution along the string and the electric field in the vicinity of the string will change. The insulators are primarily of three varieties: i) line post insulator, ii) station post insulator, iii)Suspension and tension insulators. When suspension string is made use of to sustain extraordinary tensile load of conductor it is referred as string insulator. The corona ring inserts capacitances involving the metal connectors (clips) of the insulators and the line. It is properly known that when horizontal line post insulators are mounted on versatile structures, their potential to withstand serious longitudinal loading is tremendously enhanced. glass aerial insulators of suspension insulators consists of a number of porcelain discs connected in series by means of metallic links.
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