Conductor bar

A conductor bar for a stator winding of a rotating electrical machine, comprising

• a bundle of parallel conductor strands extending between two ends of the conductor bar and spaced apart by interspaces;
• a main insulation wound around the bundle of conductor strands;
• a stack separator filling, at least in part, the interspaces;
• protection elements intercalated in between the bundle of conductor strand and the main insulation wound around said bundle;
• and
• wherein the stack separator comprises a weakness area in its volume or at an interface between the stack separator and the conductor strands, the weakness area configured to break when submitted to a mechanical stress higher than a predetermined magnitude so that the stack separator compensates, at least in part, the thermal expansion of the conductor elements.

A conductor bar for a stator winding of a rotating electrical machine, comprising

• a bundle of parallel conductor strands extending between two ends of the conductor bar and spaced apart by interspaces;
• a main insulation wound around the bundle of conductor strands;
• a stack separator filling, at least in part, the interspaces;
• protection elements completely filling a space between the bundle of conductor strands and the main insulation;
• and
• the protection elements formed from a flexible or elastic material configured to compensate thermal expansion of the conductor strands when temperature changes.