Bushings in Transformers: Functions and Types | Yash Highvoltage
A transformer's essential bushing provides mechanical support and electrical insulation for the high-voltage conductors attached to the winding terminals. It is essential to avoid electrical failure, flashover, and other potential risks in order to guarantee the transformer's performance, dependability, and safety. We'll talk about the uses and varieties of bushing in transformer in this post.
Functions of Bushings:
Electrical Insulation: The primary function of bushings is to provide electrical insulation between the high-voltage conductors and the grounded transformer tank. The insulation material used in bushings is designed to withstand high electrical stress and prevent any current leakage or breakdown.
Mechanical Support: Bushings also provide mechanical support for the high-voltage conductors, which are subjected to various stresses such as thermal expansion, vibration, and electromagnetic forces. The bushing design should be robust enough to withstand these stresses and ensure the stability of the conductors.
Oil Impregnation: In oil-immersed transformers, bushings are used to allow the flow of insulating oil between the transformer tank and the high-voltage conductors. The oil impregnation provides additional insulation and cooling to the conductors.
Types of Bushings:
OIP bushings: The most popular kind of bushing used in transformers are oil-impregnated paper (OIP) bushings. They have a straightforward shape that offers dependable insulation and mechanical support, and they are composed of premium insulating paper that has been soaked with oil.
Resin-impregnated paper (RIP) bushings: RIP bushings are similar to OIP bushings but use synthetic resin instead of oil as the impregnating material. They offer better resistance to moisture and pollution and have a longer lifespan.
Gas-insulated (GIS) bushings: GIS bushings have a gas-insulated design that improves insulation while reducing the size and weight of the transformer. They are perfect for confined high-voltage applications.