Isolated Phase Bus Design

The Generating Station Solution

This design eliminates problems common to connecting main generators to main transformers, unit transformers and auxiliary equipment in generating stations.

Each phase is mounted in individual enclosures. Conductors are air insulated and supported in the center phase enclosures by strategically arranged insulators. Phase-to-phase short circuits are eliminated and no current is induced in the steelwork, cables, pipes or other metal structures in close proximity to the bus.

The system is electrically continuous with all three phase enclosures bonded at the generator and transformer ends. The induced current flow in each is equal to the conductor current flow, but in an opposite direction. As a result, there is no flux external to the enclosure and no risk of current loss due to damaging inductive heating. Shielding provided by the enclosure reduces magnetic forces on conductors and stress on insulators as well.

In addition to convection-cooled systems, we manufacture force-cooled iso-phase buses. Each system, normally used for operations up to 40kA, includes air make-up equipment.