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Metal-Enclosed Busduct and IPB

Hyosung offers reliable and cost-effective Metal-Enclosed Bus Duct and IPB to satisfy the global customers' needs.

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  • Hyosung’s Isolated Phase Bus (IPB) is used in power plants and in industry where high-current medium voltage links are required. It was designed by taking into account the thermal and mechanical strength required against the short circuit current, earthquake, or typhoon. With its high thermal and mechanical strength, it has been evaluated as a highly reliable, safe, and durable product.
The IPB transmits the high-capacity currents between the substation of a hydro, thermal, or nuclear power plant and the main transformer. With up to a possible 40,000A rated current, Hyosung IPBs are classified into two types: self and forced cooling IPBs. Hyosung’s IPB places the individual conductor in the isolated phase type. With this configuration, the perfect closure prevents heat from transferring to neighboring structures and the malfunction of electric devices, as well as reduces the accidental current generated by the phase isolation. In order to reduce installation cost and time, Hyosung assembles as many parts as possible in the factory before delivery and supplies the necessary materials for installation, taking into account the construction conditions at the site. The IPB does not require maintenance; however, if needed, the inspection window is included in all sections where insulators are installed for easy maintenance.


  • Conductor: For heavy capacity, an octagonal duct made up of two 99.5% pure aluminum sections welded together at regular intervals by spacers is used, thus maintaining a constant clearance.
  • Enclosure: Each phase is enclosed in a weather-proof, dust-tight, and nonmagnetic metal enclosure.
  • Painting: For more effective cooling, the conductors and enclosures are painted. The outside of the enclosure is painted in accordance with the customer’s specification.
  • Supporting structure: IPB supporting structures are designed, usually with galvanized steel, to be spaced at maximum intervals. Each enclosure is secured to these structures by clamped or sliding supports to allow for expansion.
  • Post insulator: Bus support insulators are interchangeable, have a high creepage distance, and high strength in order to withstand electromechanical stress due to short circuit, wet processes, and fine glazed porcelain
  • Expansion joint: Expansion joints on the conductor and the enclosure allow the isolated phase buses to expand freely and restricts the expansion forces imposed on the civil works to those of friction.
  • Wall entrance: Where the isolated phase bus passes through the power station wall, the space between the enclosures and the wall is blocked with an aluminum plate and insulating flanges allowing isolated phase bus expansion.
  • Pressurization (Anti-condensation): In the case of self cooling, pressurization is not necessary, owing to the use of porcelain insulators with a long creepage distance; Pressurization may however be necessary in the case of a particularly aggressive environment to achieve anti-condensation.
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