Roebel Bars
This type of construction is characterized by having the conductors short-circuited at their ends and transposed in part or in their entire length. Each conductor is covered in layers of Dacron and fiberglass. The main insulation is Class “F” and is built from layers of mica tape with epoxy resin. In its straight part, the coils are covered with semiconductor tape, to avoid partial discharges to the slot. At their ends, the coils are covered with a potential grading tape, to avoid surface discharges at the exit of the core.
