GE Power & Water
– Original Instructions –
Technical Documentation
Wind Turbine Generator Systems
1&2MW Platform - 50/60 Hz
Assembly & Maintenance Wind
Speed Limitations
2015 – Revision 01
1&2 MW Platform
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1.5-70.5/77/82.5
1.6-77/82.5/87/100
1.7-100/103
1.85-82.5/87
2.x-116
2.x-107
imagination at work
© 2015 General Electric Company. All rights reserved.
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– Original Instructions –
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imagination at work
General_Description_1-2MW-xxHz_WindSpeedLimitations_EN_r02.docx
GE Power & Water
– Original Instructions –
Assembly & Maintenance Wind
Speed Limitations
Table of Contents
1
General ............................................................................................................................................................................................................... 5
1.1
Purpose .................................................................................................................................................................................................... 5
1.2
Restrictions and Warnings ............................................................................................................................................................. 5
2 Rotor Lock Limits based on Air Temperature (1.x Turbines) ..................................................................................................... 6
3 Rotor Lock Limits based on Air Density (2.x-107/116 Turbines) ............................................................................................. 7
3.1
Calculation of Air Density ................................................................................................................................................................ 7
3.2
Limit Wind Speeds for 2.x-107...................................................................................................................................................... 8
3.3
Limit Wind Speeds for 2.x-116...................................................................................................................................................... 9
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UNCONTROLLED when printed or transmitted electronically.
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General_Description_1-2MW-xxHz_WindSpeedLimitations_EN_r02.docx
x
GE Power & Water
– Original Instructions –
Assembly & Maintenance Wind
Speed Limitations
1 General
1.1 Purpose
This document defines the wind speed limits for application of the high speed shaft rotor lock (HSSRL) and the
Low Speed Shaft Rotor Lock (LSSRL) during assembly, erection, and maintenance of all 1&2MW Platform wind
turbines.
Detailed loads analysis is used to define the limit wind speed based on the design capability of the rotor locks
and the atmospheric conditions during the operations, specifically the air density. Air applies loads on the
turbine system, and the locks must overcome those forces to ensure safe operations. Those forces are a
function of the wind speed and the air density. Air density is, in turn, a function of the elevation and
temperature.
The results of the loads analysis are, therefore, maximum allowable ten minute average wind speeds as a
function of the atmospheric conditions (density or temperature) experienced by the turbine.
Two methods are presented for determining the maximum allowable wind speed for application of the locks.
Section 2 provides a method only dependent on the air temperature. This method is applicable to 1.x turbines.
Section 3 provides a method that includes both altitude and temperature to calculate the density and then
provides a look-up table for the allowable wind speed as a function of density. This method is only available for
the 2.x-107 and 2.x-116 wind turbines. These turbines also include an HMI report of the calculated allowable
value for lock application based on current atmospheric conditions.
1.2 Restrictions and Warnings
Specifications/requirements may change at any time, check for updates prior to performing operations.
Due to concerns about human exposure to cold, no maintenance operations are permitted below -31 C (-24 F).
Hub entry permitted up to either the limit wind speed of the HSSRL, or 15 m/s, whichever is lower.
In accordance with general safety guidelines:
1.
Work outside the nacelle permitted up to 15 m/s.
2.
Work inside the turbine is permitted to 20 m/s.
Blade entry is permitted to the same wind speed as hub entry.
The HSSRL and LSSRL should not be engaged at the same time.
The HSSRL is the preferred lock for assembly and maintenance activities. The HSSRL is used for all assembly
activities unless it is unusable due to damage. The LSSRL should be used only for maintenance activities
during-which the HSSRL is mechanically unavailable. Examples are maintenance to the gearbox, replacement
of the gearbox, repair of damage to the HSSRL.
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GE Power & Water
Assembly & Maintenance Wind
Speed Limitations
– Original Instructions –
2 Rotor Lock Limits based on Air Temperature (1.x Turbines)
Table 1 provides the maximum allowable ten minute average wind speeds, in meters per second (m/s), for
application of the HSSRL and LSSRL for temperatures above -10 C and below -10 C. Air temperature should be
measured outside the nacelle.
The limits reported in Table 1 assume any yaw position relative to the wind, any rotor position, and at least 2
blades pitched to feather (>89 degrees) or flag (-90 degrees). Pitching more than 1 blade away from feather or
flag with the high speed rotor lock engaged is not permitted.
Temperatures > -10 C (14 F)
Turbine Model
Temperatures < -10 C (14 F)
High Speed Shaft Rotor
Lock
Low Speed Shaft Rotor
Lock
High Speed Shaft Rotor Low Speed Shaft Rotor
Lock
Lock
1.x-100/103
15
12
11
11
1.7-103 50 Hz India TC
11
6
NA
NA
1.x-82.5/87
15
12
15
12
1.x-66, 70.5/77
15
15
15
15
1.x-66, 70.5/77 Welded
Frame
15
8
15
8
Table 1: Rotor Lock Limits based on Air Temperature for 1.x turbines
NOTE
1.x-66 is a legacy turbine model in the 1.5S series provided by Enron
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General_Description_1-2MW-xxHz_WindSpeedLimitations_EN_r02.docx
GE Power & Water
Assembly & Maintenance Wind
Speed Limitations
– Original Instructions –
3 Rotor Lock Limits based on Air Density (2.x-107/116 Turbines)
The 2.x-107 and 2.x-116 wind turbines include allowable limits for application of the rotor locks based on air
density. These limits allow for higher maximum wind speeds at high altitude as well as high temperature. When
the turbine HMI is available, it will present the maximum limit wind speed for both the HSSRL and the LSSRL
based on calculated air density as a function of altitude and air temperature.
3.1 Calculation of Air Density
Air density is calculated by the turbine HMI using equation (3.1).
−9.8∗𝐴𝑙𝑡𝑖𝑡𝑢𝑑𝑒(𝑚𝑒𝑡𝑒𝑟𝑠)
101325
𝐷𝑒𝑛𝑠𝑖𝑡𝑦(𝑘𝑔/𝑚3 ) = 287.05∗(𝑇𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒(𝐶)+273) ∗ 𝑒 287.05∗(𝑇𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒(𝐶)+273)
eq (3.1)
Table 2 provides tabulated values of density as a function of altitude and temperature, for reference.
Altitude (meters)
Air Temperature
0
100
250
500
750
1000
2000
-30 C (-22 F)
1.453
1.433
1.403
1.354
1.308
1.262
1.097
-10 C (14 F)
1.342
1.325
1.300
1.258
1.218
1.179
1.035
0 C (32 F)
1.293
1.277
1.253
1.215
1.177
1.141
1.007
10 C (50 F)
1.248
1.233
1.210
1.174
1.140
1.106
0.980
15 C (59 F)
1.226
1.211
1.190
1.155
1.122
1.089
0.967
20 C (68 F)
1.205
1.191
1.170
1.137
1.104
1.072
0.954
30 C (86 F)
1.165
1.152
1.133
1.101
1.071
1.041
0.930
40 C (104 F)
1.128
1.116
1.098
1.068
1.039
1.011
0.907
Table 2: Air Density (kg/m3) as function of altitude and air temperature
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GE Power & Water
Assembly & Maintenance Wind
Speed Limitations
– Original Instructions –
3.2 Limit Wind Speeds for 2.x-107
Consult the turbine HMI (web pages) for condition specific rotor lock limits for 3 blades attached.
The limits reported in Table 3 High Speed Shaft Rotor Lock for 2.x-107, assume any yaw position relative to the
wind, any rotor position.
During a single blade exchange, the two attached blades must remain in feathered (>85 degrees) position.
When three blades are attached, two conditions exist for the pitch of the blades. The highest wind speeds are
allowed when all blades pitched to feather (>85 degrees). A second condition is when all blades are attached
and 2 blades are either pitched to flag (-90 degrees) or feather (>85 degrees).
Pitching more than 1 blade away from feather or flag with the high speed rotor lock engaged is not permitted.
2.x-107 HSSRL
Maximum 10 minute average Wind Speed (m/s)
Air Density (kg/m3)
Single Blade Exchange
3 Blades Attached,
2 Blades Pitched to
Feather or Flag
3 Blades Attached
3 Blades Pitched to Feather
(NOT FLAG)
1.45
8
13
16
1.35
8
14
17
1.2
8

15.5
18
1.1
8*
17
18*
1.0
8*
18
18*
0.9
8*
18*
18*
Table 3: High Speed Shaft Rotor Lock for 2.x-107
The limits reported in Table 4 Low Speed Shaft Rotor Lock for 2.x-107 assume any yaw position relative to the
wind, any rotor position, and all blades feathered (>85 degrees).
Pitched any blades away from feather with the low speed shaft rotor lock engaged is not permitted.
Air Density (kg/m^3)
2.x-107 LSSRL
Maximum Wind Speed (m/s)
1.45
6
1.35
7
1.225
8
1.1
9
1.0
9
0.9
11
Table 4: Low Speed Shaft Rotor Lock for 2.x-107

value not uniquely calculated
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General_Description_1-2MW-xxHz_WindSpeedLimitations_EN_r02.docx
GE Power & Water
Assembly & Maintenance Wind
Speed Limitations
– Original Instructions –
3.3 Limit Wind Speeds for 2.x-116
Consult the turbine HMI (web pages) for condition specific rotor lock limits for 3 blades attached.
The limits reported in Table 5 High Speed Shaft Rotor Lock for 2.x-116, assume any yaw position relative to the
wind, any rotor position.
During a single blade exchange, the two attached blades must remain in feathered (>85 degrees) position.
When all three blades are attached, two conditions exist for the pitch of the blades. The highest wind speeds
are allowed when all blades pitched to feather (>85 degrees). A second condition is when all blades are
attached and 2 blades are either pitched to flag (-90 degrees) or feather (>85 degrees).
Pitching more than 1 blade away from feather or flag with the high speed rotor lock engaged is not permitted.
2.x-116 HSSRL
Maximum Wind Speed (m/s)
Air Density (kg/m3)
Single Blade Exchange
3 Blades Attached,
2 Blades Pitched to
Feather or Flag
3 Blades Attached
3 Blades Pitched to Feather
(NOT FLAG)
1.45
8
11
12
1.35
8
12
13
1.2
8

13
14
1.1
8*
14
15
1.0
8*
15
16
0.9
8*
16
17
Table 5: High Speed Shaft Rotor Lock for 2.x-116
The limits reported in Table 6 Low Speed Shaft Rotor Lock for 2.x-116 assume any yaw position relative to the
wind, any rotor position, and all blades feathered (>85 degrees).
Pitched any blades away from feather with the low speed shaft rotor lock engaged is not permitted.
Air Density (kg/m^3
2.x-116 LSSRL
Maximum Wind Speed (m/s)
1.45
6
1.35
6
1.225
7
1.1
7
1.0
8
0.9
8
Table 6: Low Speed Shaft Rotor Lock for 2.x-116

value not uniquely calculated
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