Hydraulic station and method for controlling pressure in a...

Details Hydraulic station and method for controlling pressure in a... Hydraulic station and method for controlling pressure in a...

2011-08-16

2011-08-16

Lopez, Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of...

C417S488000

Reexamination Certificate

active

07997074

ABSTRACT:
A hydraulic station in a hydraulic system of a wind turbine includes a tank for storing working fluid, first and second pumps fluidly connected to the tank, first and second flow paths extending from the respective first and second pumps to a hydraulic circuit, and first and second relief valves in fluid communication with the respective first and second flow paths. The first pump and first relief valve are controlled based on maintaining pressure of the working fluid in the hydraulic circuit between a first minimum limit and first maximum limit. If the pressure falls below the first minimum limit, the second pump and second relief valve are controlled in addition to the first pump and first relief valve, with the control then based on a second maximum limit and second minimum limit.

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