Different designs and types of transformer bushings

An insulating device called a transformer bushing makes it easier for an energised conductor to pass through the grounded tank of the transformer. For the transformer to be connected to the electrical system, bushings are necessary, and they must be able to withstand the high voltages and currents inherent in a transformer.

Types of transformer bushings

Transformer bushings come in a wide variety of designs, each with unique benefits and drawbacks. The transformer bushings that are most frequently used include:

Porcelain bushings: One of the most traditional and popular types of transformer bushings is porcelain. They are composed of premium porcelain that is impervious to moisture and high voltages. Despite being very cheap, porcelain bushings can be fragile and easily broken.

Oil-filled bushings: Oil is used as an insulating material in oil-filled bushings. Compared to porcelain bushings, they are therefore more resistant to moisture and other external variables. Additionally more resilient and able to withstand higher voltages and currents are oil-filled bushings. They do cost more than porcelain bushings though.

Gas-insulated bushings: Sulphur hexafluoride (SF6) gas is used as an insulating medium in gas-insulated bushings. In addition to being a fantastic insulator, SF6 gas is also resistant to moisture and other environmental elements. Although gas-insulated transformer bushings are the priciest option, they are also the most dependable.

Resin-impregnated paper bushings: A form of dry-type bushing that utilises a solid insulating substance is resin-impregnated paper bushings. They can take higher voltages and currents yet are more durable and less susceptible to moisture than oil-filled or gas-insulated bushings. Paper bushings that have been impregnated with resin are likewise reasonably priced.

Epoxy bushings: Epoxy resin is used as an insulator in epoxy bushings, a form of dry bushing. In addition to being a great insulator, epoxy resin is also resistant to moisture and other external elements. Although epoxy bushings are the priciest dry-type bushing available, they are also the most dependable.

Design considerations

The voltage level, ambient circumstances, mechanical stress, and maintenance needs are only a few of the variables that affect the transformer bushing selection. Some of the crucial design factors for transformer bushings include the following:

Voltage level: The transformer's maximum allowable voltage must be greater than the bushing's voltage rating.

Environmental conditions: The environment in which the bushing will be installed must be able to support it. For instance, outdoor bushings must be resistant to moisture and other weather elements.

Mechanical stress: The bushing needs to be strong enough to stand up to the mechanical pressure that will be put on it. Both the conductor's weight and the forces produced by the current running through it are included in this.

Maintenance requirements: The bushing needs to be simple to replace and maintain.

Any transformer must include transformer bushings. The high voltages and currents present in a transformer must be withstood by them, and they must be able to do so safely and reliably. The voltage level, ambient circumstances, mechanical stress, and maintenance needs are only a few of the variables that affect the transformer bushing selection. https://yashhv.com

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