High Voltage Bushings

Manufacture and Refurbish HVB

High Voltage Bushing Services

AGTServices has the capability to manufacture new replacement high voltage bushings of models 2″, 4″, and 6″ single and double tang as well as gas cooled bushings for hydrogen cooled GE generators.

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New High Voltage Bushings

The ability to replace porcelain insulators particularly distinguishes AGTServices from its competition.

HVB manufacturing performed by AGTServices will typically involve the following:

  • Prepare porcelain insulator(s) and flanges for assembly, checking for any imperfections
  • Clean & Inspect all high voltage bushing components prior to assembly
  • Assemble flange to porcelain and silver-plate lead connections
  • Perform tests during high voltage bushing assembly process (Electrical HI pot test on insulated bushing conductor)
  • Bond gaskets, complete HVB assembly in HVB standards
  • Pressure Test completed bushing(s) for leakage
  • Hipot Test completes bushing(s) & Doble Test (if required)
  • Package & Box high voltage bushing for shipment

Manufacturing of New High Voltage Bushings for Over 10 Years

  • 250 new bushings made to date
  • 7-21 day cycle for new bushings
  • 2″, 4″, and 6″ models in stock at headquarters in NY
  • Ability to restore both standard and non-standard OEM components

Some vendors have abandoned the use of ceramic materials and have substituted composite material, which has had a history of being less robust during the manufacturing of high voltage bushings.

High Voltage Bushing Refurbishment

The next best option is removal of the HVB from the generator, followed by a complete refurbishment of the existing HVB or complete HVB replacement with all new parts. AGTServices offers this option to provide the most reduced cycle time to return a refurbished HVB to minimize customer down time. AGTServices has the capability and experience to refurbish all makes and models, including: Westinghouse, Siemens, ABB, Hafley, GE, and ALSTOM.

A typical HVB refurbishment performed by AGTServices will involve the following:

  • Complete disassembly
  • Assessment & evaluation of all components
  • Replace all gasket seals with Viton Seals
    Inspection / Re-insulation of the copper conductor
  • Inspection / Replacement (if required) of porcelain insulator
    Cleaning of all components to “as new” condition
  • Silver plating connection ends
  • Reassembly
  • Pressure testing
  • Electrical testing including Hi Pot and Doble (if required)
  • Pack & Ship

AGTServices' Experience with HVB Refurbishment

  • Over 165 bushings refurbished to date
  • Over 30 bushings re-designed & upgraded
  • 2-3 weeks cycle on refurbished HVB
  • Significant cycle reduction on replacement HVB with available stock parts
  • Ability to restore / Supply / repair both standard and non standard OEM components

Contact Us to Learn More About our HVB Services

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