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ENERCON E-40 Operating Instructions
Page 29 of 96
The main switch should only be actuated when the rotor has already stopped. Its principal task is to deenergize the wind energy converter for maintenance work.
Main status: 10 : Emergency stop actuated
3.8 Lack of wind
If after the start of the turbine a mean wind speed is measured which is lower than the required start-up wind speed, status 2 will be indicated after at least one minute.
Main status: 2 : Lack of wind
If the turbine is already in operation and the rotor speed gets too low due to insufficient wind, the rotor blades are slowly adjusted towards 60° until the rotor is idling. In that case, too, the status "Lack of wind" will be indicated.
The E-40 only reassumes operation automatically when the start-up wind speed has been reached.
If due to low temperatures (<3°C) there is the possibility that the anemometer may be iced, the turbine will carry out starting attempts every hour in order to test if the wind speed is now sufficient for operation. If the turbine starts and supplies power, it will change over to normal operation. However, there is no correct recording of wind speeds since the iced sensor can not transmit the wind speed properly.
3.9 Storm
If the wind speed is higher than 25 m/s, the wind turbine will not start.
As soon as the maximum rotor speed or the maximum blade angles are exceeded, normal operation of the turbine is stopped; the turbine changes over to the idling mode. The components of the E-40, such as rotor blades, nacelle, tower and foundation, are designed so as to withstand - depending on the actual design of tower, foundation etc. - gusts of up to 70 m/s.
Main status: 3 : Storm
The turbine will restart automatically if the wind speed has dropped below the cut-out wind speed for a certain period of time (10 min.).
This does not apply for turbines with a strong-wind power curve, also called storm-regulation. In that case the E-40 can be operated at wind speeds of up to 36 m/s. At wind speeds higher than 25 m/s, the pitch of the rotor blades is continually adjusted in order to keep the load in the admissible range. The rotor speed decreases for higher wind speeds. Up to a wind speed of 27.5 m/s the power output is kept at its rated level. At higher wind speeds up to 36 m/s the power output drops linearly to 0 kW. If the wind speed drops below 36 m/s, the turbine immediately generates power again, since it will continue to idle even at higher wind speeds and the converter remains connected to the grid.
3.10 Rotor speed monitoring (rotor overspeed)
The rotor speed is permanently monitored by the control and monitoring system and adjusted if necessary. In order to protect the E-40 against damage, the rotor speed is measured and checked for plausibility by a redundant system.
Operation
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