Hydraulic supply unit

A hydraulic supply unit for dissipating heat from mechanical and electrical components for mounting in a nacelle of a wind power plant comprising:

• a first circuit providing oil for lubricating a gearbox of the wind power plant, said first circuit including a first pump for directing the oil through the gearbox and a first heat exchanger;
• a second circuit providing hydraulic oil to operate hydraulic actuating devices of the wind power plant, said second circuit including a second pump for directing the hydraulic oil to the hydraulic components and a second heat exchanger, said second circuit being fluidly isolated from the oil of the first circuit;
• and
• a main cooling circuit including a main heat exchanger in fluid communication with each of the first and second heat exchangers for dissipating heat from both the lubricating oil of the first circuit and the hydraulic oil of the second circuit, as well as absorbing lost heat from electrical components of the wind power plant, said main cooling circuit including a main pump providing a flow of coolant delivered about the first, second and main heat exchangers, as well for the electrical components, said main cooling circuit being fluidly isolated from both the oil for lubricating of the first circuit and the hydraulic oil of the second circuit, wherein the hydraulic unit is pre-assembled and can be tested as a functional unit prior to being installed in a wind power plant.