High Voltage Bushing as per IS 3347 / IS 8603

High Voltage Bushing as per IS 3347 / IS 8603

A porcelain bushing is a hollow cylinder that fits through a hole in a transformer wall, A conductor, usually a copper rod, passes through the center of the bushing, The inside of the bushing is to be filled with oil to provide additional insulation, A semi-conducting glaze used to help equalize the electrical potential gradient. There are wide range of porcelain bushing available, starting from 1 kV 250 A to 52 kV 3150 A.

  • 11 / 15 / 17.5 kV System
    • 11 / 17.5 kV 250 Amp
    • 11 / 17.5 kV 630 Amp
    • 11 / 17.5 kV 1000 Amp
    • 11 / 17.5 kV 2000 Amp
    • 11 / 17.5 kV 3150 Amp
  • 36 kV System
    •  36 kV 250 Amp
    • 36 kV 630 Amp
    • 36 kV 1000 Amp
    • 36 kV 2000 Amp
    • 36 kV 3150 Amp
  • 22 / 24 kV System
    •  24 kV 250 Amp
    •  24 kV 630 Amp
    •  24 kV 1000 Amp
    •  24 kV 2000 Amp
    •  24 kV 3150 Amp
  • 52 kV System
    • 52 kV 250 Amp
    • 52 kV 630 Amp
    • 52 kV 1000 Amp
    • 52 kV 2000 Amp
    • 52 kV 3150 Amp

Porcelain Bushing for Transformer – Working, Benefits & Key Notes

A porcelain bushing for transformer is a critical insulating component used in electrical transformers to safely transmit high voltage through the transformer tank. Whether you're dealing with power or distribution transformers, the porcelain bushing for transformer ensures both safety and performance.

What is Porcelain Bushing for Transformer?

The porcelain bushing for transformer is designed using glazed porcelain material that insulates and supports the high-voltage conductor as it enters or exits the transformer. It prevents arcing, current leakage, and electrical faults. Every porcelain bushing for transformer is built to handle harsh weather, mechanical stress, and high electrical loads, making it a trusted choice across India.

How Does a Porcelain Bushing for Transformer Work?

The porcelain bushing for transformer works by:

  • Insulating the current-carrying conductor from the grounded metal tank

  • Allowing high voltage to pass safely without leakage or flashover

  • Supporting the internal lead connected to transformer windings

Inside the porcelain bushing for transformer, a central conductor is surrounded by layers of insulating materials, including oil or resin in some variants. The outer porcelain acts as a robust barrier against moisture and pollution.

Key Learning Notes on Porcelain Bushing for Transformer

  • The porcelain bushing for transformer is essential for high voltage insulation.

  • It supports voltages ranging from 11kV, 22kV, to 33kV and beyond.

  • The porcelain bushing for transformer is ideal for both indoor and outdoor applications.

  • Made using weather-resistant porcelain for durability and long life.

  • Compliant with IS/IEC standards for transformer safety and efficiency.

  • Ensures safe transmission of electricity with minimal losses.

  • Suitable for oil-immersed and dry-type transformers.

  • The porcelain bushing for transformer also reduces maintenance frequency by offering strong mechanical and thermal stability.

  • Every porcelain bushing for transformer from trusted suppliers like Dhruti Sales is tested for high performance.


In modern substations and industries, choosing the right porcelain bushing for transformer is vital. If you're looking for a reliable porcelain bushing for transformer, explore ISI-certified options for high voltage protection.