The electrical insulation and support for the high-voltage connections between the transformer windings and the external power system are provided by the high-voltage (HV) bushings in transformers. HV bushings are developed to withstand the high electric fields and voltages prevalent in transformer applications. They are commonly composed of porcelain or composite materials.

HV bushings are necessary parts of transformers and are crucial to the safe and dependable operation of the electrical grid. An HV bushing failure may result in a transformer outage, which may impair customer access to electricity.

Here are some of the key functions of HV bushings in transformers:

• Put electrical insulation between the grounded tank and the high-voltage transformer windings.

• Support the transformer's high-voltage connections.

• Give the electrical connections on the transformer a waterproof seal.

• Sync up the transformer tank's internal pressure with the environment outside.

The voltage rating of an HV bushing, or the highest voltage it can safely sustain, is often used to categorise them. Transformer HV bushings are commonly rated at 69 kV to 765 kV and higher.

Strict industry standards, such as those set forth by the Institute of Electrical and Electronics Engineers (IEEE), are adhered to in the design and production of HV bushings. These specifications guarantee the security and dependability of HV bushings when used in transformer applications.

Here are some of the common types of HV bushings used in transformers:

• Oil-filled bushings: High-grade insulating oil that offers insulation and cooling fills these bushings.

• Gas-insulated bushings: An inert gas, such as nitrogen or sulphur hexafluoride (SF6), is injected into these bushings to act as insulation.

• Composite bushings: These bushings are constructed from a composite material that offers support and insulation, including porcelain and resin.

HV bushings are essential parts of transformers and are crucial to the power grid's ability to function safely and dependably. Read more @ HV bushing in transformer