Roebel bar for rotating electrical machines

A Roebel bar for a rotating electrical machine comprising:

• a straight slot part disposed in a slot in an iron sheet of a stator of the rotating electrical machine;
• a bent yoke part adjacent to the straight slot part and protruding from the stator, wherein the bent yoke part is configured to connect the Roebel bar to at least one more Roebel bar so as to form a winding;
• a copper conductor disposed in the straight slot part and the bent yoke part;
• a first insulation surrounding the copper conductor and having an outer surface;
• a slot corona shielding including an electrically conductive layer disposed on the outer surface of the first insulation in an area of the straight slot part;
• a yoke corona shielding including a semiconducting layer disposed on the outer surface of the first insulation in an area of the bent yoke part;
• and
• an element configured to lower a capacitive coupling disposed in a transitional region between the straight slot part and the bent yoke part so as to prevent excessive heating and discharges in the transitional region, the element including an additional second insulation disposed directly on the first insulation and extending along the transitional region.