06265785 is referenced by 29 patents and cites 22 patents.

A method and apparatus for non-volatile overspeed protection is described. The present invention provides a method and apparatus for non-volatile overspeed detection to provide turbine rotational speed safety during a power outage. In one embodiment, aerodynamic braking is used to slow rotation of a rotor of the wind turbine. If an overspeed condition continues after application of aerodynamic braking, mechanical braking is used to reduce the rotational speed of the rotor. Power is supplied by a non-volatile power source to continue overspeed detection during a power outage. A low-pressure trigger valve is used to apply a mechanical brake when hydraulic pressure in the braking system falls below a predetermined threshold.

Title
Non-volatile over speed control system for wind turbines
Application Number
9/201271
Publication Number
6265785 (B1)
Application Date
November 30, 1998
Publication Date
July 24, 2001
Inventor
Craig Leonard Christenson
Tehachapi
CA, US
Kevin Lewis Cousineau
Tehachapi
CA, US
Agent
Blakely Sokoloff Taylor & Zafman
US
Assignee
Zond Systems
CA, US
IPC
F03D 9/00
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