The ornamental design for a busbar for windturbine, as shown and described.
FIG. 1 is a perspective view of a bus bar for wind turbine, showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The bus bar for wind turbine is shown with a symbolic break in its length and height as illustrated with the dash-dot broken lines. The appearance of any portion of the bus bar for wind turbine between the break lines forms no part of the claimed design.