Isolated Phase
  • Isolated Phase Bus is available for voltages ranging from 15kV through 38kV, with ampere ratings up through 42,000 amps. Isolated Phase Bus has the conductor for each phase in a separate metal enclosure. The usual application for Isolated Phase Bus is in power plants connecting the generator output to the main step-up transformer. Isolated Phase Bus provides the high degree of reliability required for power generation facilities.

  • Isolated Phase Bus are primarily used as generator main leads extending to GSU transformers and station service/auxiliary transformers. They can handle very high ampacities, such as 42,000 amps continuous and can withstand very high short circuit levels. They are built with weather tight construction.

  • Both the housing and the conductors are fabricated from aluminum, providing high conductivity, corrosion-free operation, and optimal costs. Powell construction utilizes high-creep, single insulator supports of proven mechanical-electrical design, which results in fewer insulators and a corresponding reduction in creepage paths to ground.

  • Design Considerations to integrate with connected equipment include:
    • Ampacity, Voltage Rating, Basic Impulse Level (BIL)
    • Allowable Temperature rise over a Given Ambient
    • Momentary Rating
    • Self-cooled or Forced-cooled Requirement
    • Allowable Losses
    • Interface to Equipment
    • Site Conditions
    • Support System Requirements and Restrictions.

  • The Powell Team is dedicated to supplying an entire portfolio of bus duct products to meet the specific needs of your application and to ensure that customers and end users receive equipment that is of the highest quality and reliability. Our technical staff is ready and available for consultation to establish the final product configuration that will conform to your most specialized needs.

    • Current: 600 through 42,000 Amps
    • Voltage: Up to 38,000 Volts
    • Insulation Levels (BIL): 110 through 150kV
    • Momentary Current: through 900,000 Amps asymmetrical

    Have a question? Let us know.