Item no.: 960314.R5
Date 2006-09-11
Issued by: Technology
Class: II
Type: MAN
Page 9 of 32
Safety Regulations for Operators and Technicians
V90 – 3.0MW/V100 – 2.75MW
Vestas Wind Systems A/S · Alsvej 21 · 8900 Randers · Denmark · www.vestas.com
9. Grid
Drop-Out
A grid drop-out causes an EMERGENCY STOP. The blades pitch out of the wind (full feathering); the
yaw system, the hydraulic pump and the nacelle ventilator stop. Consequently, all moving parts will be
brought to a standstill except for emergency lubrication system for the gearbox. The power supply for
the light and the nacelle, hub and ground controllers is partly off. However, the capacitors in the
converter and AGO2 section might be energized.
10. Converter and AGO2 Sections
WARNING:
If working on the converter section or AGO2 section, note that the capacitors inside can be
charged to 800 V and those in the filters can be charged to 690 V. The capacitors are discharged
to below 50 V in 5 minutes after disconnection from the grid. Switch Q7 and Q8 must be turned
off.
Before opening the cabinet, check the DC-link-voltage in picture 17.
Before working on the converter/AGO2, check the DC-link-voltage with a Fluke multimeter.
11. Turbine
Standstill
After a period of maximum 14 days without grid connection, necessary equipment for humidity- and
temperature control must be installed in the turbine in order to fulfil the following requirements:
•
For 90 % of the shutdown period, the relative humidity (RH) must not exceed 45 %.
•
The RH must be between 45% and 60% for max. 10% of the shutdown period only.
•
Within a period of 12 hours, the temperature in the turbine must not drop more than 10° C.
•
The temperature and humidity must be logged.
During a period without grid connection, the following inspections must be carried out on a monthly
basis:
•
Check the functionality of the equipment as regards humidity and temperature.
•
Check the RH and temperature logging in accordance with the requirements mentioned
above.
•
Check the emergency lubrication.
•
Recharge emergency lubrication batteries (only every 3 months).
•
Check the blade locking system.
•
Check that the brake is released and without pressure.
