Porcelain Insulator

The low-voltage bushing is located on the side of the transformer body and is used to connect the cabinet busbar to the low voltage transformer coil. 

The low-voltage bushing is located on the side of the transformer body and is used to connect the cabinet busbar to the low voltage transformer coil.

A lightning arrester (alternative spelling lightning arrestor) (also called lightning isolator) is a device, essentially an air gap between an electric wire and ground, used on electric power transmission and telecommunication systems to protect the insulation and conductors of the system from the damaging effects 

High voltage insulators can be made of ceramic, glass, polymer, or composite materials, and are designed to withstand high electrical stress and high mechanical strength.