| 摘要 |
A Roebel bar (10) for rotating electrical machines, in particular for turbogenerators, comprises a straight slot part (NT), which is placed in a slot in the iron sheet of the stator of the machine, and a bent yoke part (BT), which adjoins said slot part and protrudes from the stator and by means of which each bar is connected to other bars to form a winding, the Roebel bar (10) having a Cu conductor (11) surrounded by an insulation (12), and the surface of the insulation (12) being provided with slot corona shielding (13) in the form of an electrically conductive layer in the slot part (NT) and with yoke corona shielding (14) in the form of a semiconducting layer in the yoke part (BT). Such a Roebel bar is decisively improved by providing that, to prevent excessive heating and discharges in the transitional region between the slot part (NT) and the yoke part (BT), means (15) for lowering the capacitive coupling are provided in this region. |
