Know About Transformer Bushing Designs and Types | Yash Highvoltage Ltd.

 

A power transformer's transformer bushings are a crucial part. They offer a secure and dependable link between the high-voltage electrical network and the transformer windings. Bushings serve as insulators and are built to endure significant mechanical and electrical strains.

The many designs for transformer bushings and their uses will be covered in this article.

• Oil-impregnated Paper Bushings

The most popular kind of bushing used in power transformers is oil-impregnated paper. They are made up of a porcelain insulator supporting a paper tube that has been impregnated with insulating oil. These bushings are a common option in the sector since they are dependable and affordable.

• Resin-impregnated Paper Bushings

Oil-impregnated paper bushings and resin-impregnated paper bushings both function similarly. However, they use epoxy resin as an insulating substance rather than oil. These bushings last longer and are more hygienic and contaminant-resistant.

• Composite Bushings

Composite materials like fibreglass, silicone rubber, or epoxy are used to create composite bushings. The bushings can be made to tolerate severe temperatures and climatic conditions, and these materials offer outstanding electrical and mechanical qualities.

• Gas-insulated Bushings

A gas, such as SF6, is used as an insulating medium in gas-insulated bushings. These bushings, which are utilised in high-voltage applications, differ from other types of bushings in that they are smaller in size, have higher voltage ratings, and require less maintenance.

• Capacitive Bushings

In order to offer insulation, capacitive bushings utilise the capacitance created between two conducting parts. They are less expensive than other kinds of bushings and are frequently utilised in low-voltage applications.

Finally, it should be noted that transformer bushings are crucial to the safe and dependable operation of power transformers. It can be easier to choose the right type of bushing for a given application if you are aware of the various bushing designs and their uses. The most popular form is oil-impregnated paper bushings, however resin-impregnated paper bushings, composite bushings, gas-insulated bushings, and capacitive bushings each have unique benefits in particular applications.