Porcelain Bushings | Transformers & Switchgear

Webster-Wilkinson Porcelain Bushings

Webster-Wilkinson Porcelain Bushings

porcelain bushings

Webster-Wilkinson offer a complete range of bushings which utilise porcelain insulation designed for use in power transformers, distribution transformers and pole mounted transformers operating at LV MV HV electrical voltages.

Porcelain insulation is a proven technology which provides low cost, long life and maintenance-free solutions which can withstand all environmental conditions.

For a given operating voltage porcelain insulators can be provided with varying creepage distances depending on environmental conditions.

Porcelain bushings are normally supplied with brown glaze however if required, they can be given a grey glaze. All bushings meet the requirements of BS EN ISO 60137 Standards.Bushings

BS EN ISO 60137: Insulated Bushings for Alternating Voltages above 1000V

Please contact us for technical support, stock availability and competitive quotations for the complete range of porcelain bushings.


The Webster-Wilkinson range covers:

Standard Porcelain Bushings

  • Bushings suitable for use outdoors
  • Offer enhanced insulation levels in excess of ISO 60137 requirements
  • Ideal for use in transformer applications where high pollution levels exist due to the anti-corrosion plating

Power Bushings

  • High specification porcelain bushings
  • Suitable for use on power transformers
  • Available in free-flow and self contained designs

Low PD Bushings

  • Low partial discharge porcelain bushings
  • Available from 12kV to 52kV
  • Features a bonded flange arrangement

Cable Box Bushings

  • Designed for use inside cable boxes
  • Feature cork composite gaskets
  • Available in Oil/Oil, Oil/Heat Shrink and Oil/Air designs

DIN Bushings

  • Doughnut shaped oil seal compressed around a terminal ‘bolt’
  • Porcelain brown glazed ceramic insulators
  • Compliances – DIN 42530, DIN 42531, DIN 42532, DIN 42533, DIN 42534, DIN 42539, DIN 42541

EN Bushings

  • Comply with current EN Standard requirements
  • A plastic under oil arrangement gives enhanced anti-rotation properties
  • No need for additional gaskets


ENA Bushings

  • Energy Networks Association (ENA) compliant
  • Suitable for ground mounted distribution transformers and unit substations, or
  • pole mounted transformers

BEBS Bushings

  • Compliant with British Electricity Boards Specifications

Switchgear & Transformer Bushings

Contact us for complete range of Indoor & Outdoor Transformer Bushings manufactured in accordance with IEC 60137 and product standards including EN50386 and EN50180. A standard range of porcelain bushings are offered according to EN50336 (historically BS2562 & BS6435) for use up to 36kV 4000A.

Cable box bushings are designed for use indoors but can be used in several insulating mediums typically oil/compound (fully insulated), oil /air (partially insulated) and air/air (partially insulated).

  • BS EN 50386 Bushings up to 1kV and from 250A to 5kA for liquid filled transformers
  • BS EN50180 Bushings above 1kV up to 52kV and from 250A to 3,15 kA for liquid filled transformers
  • BS EN50336 Bushings for transformers and reactor cable boxes not exceeding 33kV/36kV

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