Wind turbine power transmission system and method of installing a wind farm including same

A method of installing a wind farm, comprising:

• installing a tower of a first wind turbine;
• installing a power transmission system on the tower, the power transmission system including a gearbox and generator integrated together, the gearbox having a gearbox housing and a gearbox output member extending from the gearbox housing, the generator having a generator housing coupled to the gearbox housing, a stator positioned within the generator housing, a rotor coupled to the gearbox output member so as to be driven thereby, wherein the rotor is positioned within the generator housing and effectively divides the generator housing into a drive-end side and non-drive-end side, the drive-end side being coupled to the gearbox housing, and the stator being supported between the drive-end side and non-drive-end side, the generator further including a non-drive-end shield coupled to the non-drive-end side of the generator housing and having a recess radially disposed about the rotor, an end adaptor coupled to the rotor and extending out of the generator housing so as to nest within the recess, and a turning gear positioned outside the generator housing and coupled to the end adaptor so that at least a portion of the turning gear is received in the recess;
• mounting at least one auxiliary drive to the non-drive-end shield, the turning gear being positioned next to the at least one auxiliary drive after the at least one auxiliary drive has been mounted;
• mounting a hub to the power transmission system, the gearbox being configured to increase a rotational speed of the hub;
• mounting one or more blades to the hub;
• and
• rotating the turning gear with the at least one auxiliary drive, wherein the at least one auxiliary drive rotates a respective pinion that meshes with the turning gear, and further wherein the hub is rotated by the turning gear.