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1. WO2020002034 - SAFETY DEVICE AND METHOD FOR A WIND TURBINE

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

CLAIMS

1. A safety device for switching a wind turbine between a safe mode of operation and a normal mode of operation, the safety device comprising

a controller (110, 210) comprising a first pair of ter minals (111, 112; 211, 212), a second pair of terminals (113, 114; 213, 214), and control logic, the control logic being adapted to generate an output signal indicative of either the safe mode of operation or the normal mode of operation, and a switching assembly (120, 220) operable to select one of the normal mode of operation and the safe mode of opera tion, the switching assembly comprising a first switch (121, 221) and a second switch (122, 222) adapted to operate syn chronously, wherein the first switch is adapted to selective ly connect and disconnect the first pair of terminals, and wherein the second switch is adapted to selectively connect and disconnect the second pair of terminals,

wherein the control logic is adapted to generate the output signal indicative of the normal mode of operation when both the first pair of terminals and the second pair of ter minals are respectively connected, and to generate the output signal indicative of the safe mode of operation when at least one of the first pair of terminals and the second pair of terminals are not respectively connected.

2. The safety device according to the preceding claim, wherein the controller further comprises

a first signal generator connected to one of the first pair of terminals and adapted to generate a first character istic signal,

a first signal detector connected the other one of the first pair of terminals and adapted to detect the first char acteristic signal,

a second signal generator connected to one of the second pair of terminals and adapted to generate a second character istic signal, and

a second signal detector connected to the other one of the second pair of terminals and adapted to detect the second characteristic signal,

wherein the control logic is adapted to determine that the first pair of terminals are connected when the first sig nal detector detects the first characteristic signal and de termine that the second pair of terminals are connected when the second signal detector detects the second characteristic signal .

3. The safety device according to the preceding claim, wherein the first characteristic signal is a pulsed signal having a first frequency, and wherein the second characteris tic signal is a pulsed signal having a second frequency.

4. The safety device according to the preceding claim, wherein the first frequency differs from the second frequen cy .

5. The safety device according to any of the preceding claims, wherein the controller is a safety PLC (110) .

6. The safety device according to any of claims 1 to 4, wherein the control logic comprises a first relay (216) and a second relay (217) arranged in series between a voltage source and an output terminal (215) , wherein the first relay is adapted to close and the second relay is adapted to close when the first pair of terminals are connected and the second pair of terminals are connected.

7. The safety device according to the preceding claim, wherein the first relay comprises a first auxiliary relay (216a) adapted to indicate the state of the first relay, wherein the second relay comprises a second auxiliary relay (217a) adapted to indicate the state of the second relay, and wherein the first auxiliary relay and the second auxiliary relay are connected in series to form a feedback circuit (218) .

8. A wind turbine comprising

a wind turbine generator,

a wind turbine controller, and

a safety device according to any of the preceding claims ,

wherein the wind turbine is communicatively coupled to receive the output signal from the safety device and adapted to operate the wind turbine generator in either a safe mode of operation or a normal mode of operation in dependency of the output signal.

9. The wind turbine according to the preceding claim, wherein the wind turbine controller is responsive to local input only when operating in the safe mode of operation, and wherein the wind turbine controller is responsive to both lo cal and remote input when operating in the normal mode of op eration .

10. A wind farm comprising a plurality of wind turbines ac cording to claim 8 or 9.

11. A method of switching a wind turbine between a safe mode of operation and a normal mode of operation, the method com prising

determining whether a first pair of terminals are con nected,

determining whether a second pair of terminals are con nected,

generating an output signal indicative of the normal mode of operation when it is determined that both the first pair of terminals and the second pair of terminals are re spectively connected, and

generating an output signal indicative of the safe mode of operation when it is determined that at least one of the first pair of terminals and the second pair of terminals are not respectively connected.

12. A computer program comprising computer executable in structions which, when executed by a computer processing de vice, are adapted to perform the steps of the method accord ing to the preceding claim.