There are some materials, such as glass and paper, are superb insulators. All of them are beautiful for insulation of cables and electrical wiring and certainly, used as a flexible covering on them.High- voltage power lines are generally only air, because steady and firm coverings aren't practical. Insulator - it is a device for electrical and mechanical connection betwixt of electrical device's parts, that is under different electrical potentials. Insulator consists ofdetails of its bending (fittings) and dielectric (that is insulator itself). Construction and sizes of insulators are defined with the help of conditions of its exploitation and mechanic loads, electrical voltage of installations High voltage
glass insulators of open sub-distributing devices and power lines of substations and electrical stations open for influenceof atmospheric condensations, but they are peculiarly dangerous while strong pollutions of air and the environment.In such insulators for increase of voltage flashover outer surface gets complicated shape, that makes longer the way of discharge. Glass insulators are made of unusual strained glass, also, they have high mechanic durability, and their weight and size is more less than the same insulators made of porcelain. The only disadvantage that they have is a small electric resistance.
Glass insulators value is that they provide enough electric durability, shaping by the voltage of electric field (kV/m), with which material of the insulator losses its dielectric qualities, besides, they have enough mechanic durability, that gives the possibility to withstand to the dynamic efforts, which come up betwixt different current-conducting parts during short closing in a circuit, they create permanence of their qualities under the influence of environment (rain, snow and etc), they have enough heat resisting, it means they donot modify their electrical qualities in time when temperature changes in necessarylimits, their surface is steady for the effect of electric charge.
Glass insulators for sale and installation is not the only one where they can be used, on occasion they can be used in in very popular collecting. They can have different sizes,shapes, colours and prices. They are resplendent for display and have priceless historic interest.
