Transformerless HVDC machines, windings have insulating layer sandwiched by semi-conducting layers

摘要

In rotating machines for the transformerless generation of HVDC, which include high-voltage single-winding/multiple-winding machines or converters, the windings consist of a cable 1. The cable has conductor 2 surrounded by semi-conducting layer 3. A layer of solid insulation 4 surrounds layer 3, and layer 4 is surrounded by semi-conducting layer 5.