What are the types of transformer bushing : Yash Highvoltage
There are several types of transformer bushings, each designed for a specific purpose and application. Some of the most common types of transformer bushings include:
Oil-impregnated paper bushings: These are the most common type of bushings, particularly in small and medium-sized transformers. They consist of a paper insulation impregnated with oil, which provides both electrical and mechanical insulation.
Resin-impregnated paper bushings: These bushings are similar to oil-impregnated paper bushings, but use resin instead of oil as the impregnating agent. Resin-impregnated paper bushings are more environmentally friendly, as they do not contain oil.
Epoxy resin bushings: These bushings are designed for high-voltage applications and have a higher mechanical and thermal strength than paper bushings. Epoxy resin bushings are also more resistant to environmental stresses and are less prone to moisture ingress.
Composite bushings: These bushings use a combination of materials, such as silicone rubber, epoxy resin, and fiberglass, to provide both electrical and mechanical insulation. Composite bushings are more compact than traditional bushings and are ideal for use in high-voltage transformers where space is limited.
Capacitive-graded bushings: These bushings are designed to reduce the risk of voltage flashover, particularly in high-voltage transformers. They use a capacitive grading system that evenly distributes the electrical field, reducing the risk of voltage breakdown.
Gas-insulated bushings: These bushings use a gas, such as sulfur hexafluoride, as the insulating material. Gas-insulated bushings are ideal for use in high-voltage transformers, as they have a smaller footprint and provide excellent electrical insulation.
In summary, the type of transformer bushing used depends on the specific application and requirements of the transformer. Factors such as voltage, current, and environmental conditions need to be considered when selecting the appropriate type of bushing for a particular transformer.
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