A Definition of High Voltage Insulators
High Voltage Insulators, also called dielectrics, resist the flow of electric current. These materials are used as a part of electrical equipment mainly as insulators. They support or separate electrical conductors without passing current through wires. As air is an insulator itself, no other substance is needed to keep the electricity flowing in the wires, but when they touch each other the cross connections and short circuits are bound to happen, and result in fire hazards. The coaxial cables have a conductor at the centre and hollow insulating cover. They are used for attaching electrical power transmission lines to utility pylons. The dielectric material may be ceramic, Teflon or glass. Rubber-like polymers are also used sometimes, while the plastics are equally good to be used for insulating electrical wiring and cables. They have low bulk-resistivity, and can withstand low to moderate voltage of hundred to a few thousand volts.