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ANNEX 8
WIND TURBINE GENERATOR TECHNICAL SPECIFICATION S95‐2.1 MW
Table of contents
It must not be copied nor reproduced in whole or in part without permission in writing from the owners of the copyright. Trademarks mentioned in this document are the property of SUZLON Energy Ltd. its affiliates or their respective owners. © 2012 by SUZLON Energy Ltd. All rights reserved.
This document is the property of SUZLON Energy Ltd. It is supplied in confidence and commercial security on its contents must be maintained. It must not be used for any purpose other than that for which it is supplied nor may information contained in it be disclosed to unauthorized persons.
1 Technical data............................................................................................................................ 4
1.1 Operating data ..................................................................................................................................................................... 7
1.2 Tower ................................................................................................................................................................................. 10
1.3 Nacelle................................................................................................................................................................................ 10
1.4 Rotor................................................................................................................................................................................... 15
1.5 Transformer........................................................................................................................................................................ 17
Preamble
This technical specification describes the S95‐2.1 MW wind turbine generator. The specification has to be recognised by its reference
WIND TURBINE GENERATOR TECHNICAL SPECIFICATION S95‐2.1 MW at Revision 02, dated 2012‐02‐21. The seller must not recognise
this specification at any other issue or revision level unless accepted by him in writing. Each page carries its specific revision date and
revision code. Chapter numbers that are not included in this specification are unassigned.
If typographical errors or conflicts exist between a customer purchase agreement and this standard specification, SUZLON Energy
Ltd. reserves the right to issue a revision or a temporary revision. It is the user's responsibility to ensure to have the correct issue and
revision level where applicable.
The information in this document contains general description of the technical options available which may not apply in all cases.
The required technical option is therefore to be specified in the contract.
Reconciliation with purchase agreement
In the event of any conflict or discrepancy between this specification and the purchase agreement, the controlling document must
be the purchase agreement.
Reconciliation with illustrations
The illustrations contained in this specification are intended to assist in understanding the text and do not form part of this
specification for contractual purposes, except where otherwise stated.
Specification precedence
In the event of any conflict or discrepancy between the requirements of this specification and any other specification referred to in
this specification the requirements of the text of this specification must be held to govern.
Revision 02 | 2012‐02‐21 | PDG‐CD‐S‐PDO‐00822 | Public 3/17

POWERING A GREENER TOMORROW
WIND TURBINE GENERATOR

TECHNICAL SPECIFICATION
S95‐2.1 MW
Project: Standard | STV/LTV | 50 Hz
Revision Code: PDG‐CD‐S‐PDO‐00822 [Original]
Document Class: Public
Revision/Date: 02/2012‐02‐21
SUZLON Energy GmbH

Kurt‐Dunkelmann‐Str. 5 +49 381 12884‐0
Building 245 +49 381 12884‐550
18057 Rostock germany‐documentation@suzlon.com
Germany www.suzlon.com
WIND TURBINE GENERATOR TECHNICAL SPECIFICATION S95‐2.1 MW
Responsibility
Approved by
Technical Product Manager
Released by
Program Manager
Digital signature
List of changes*
Revision Name/Date Page Change aspect (by buyer, manufacturer or developer)

01 B. Malcher/2011‐12‐07 all New document
02 J. Mueller/2012‐02‐21 7 New power curve added with ct, cp values, footnote added (by developer)
14 Converter chapter shifted into generator chapter (by developer)
16 Mass moment of inertia blade withdrawn (by developer)
* Changes to the design of the wind turbine generator (WTG) from the standard detailed in this specification have to be made as
follows:
Buyer originated changes
This specification can be revised by Specification Change Notices (SCN) which describe the changes to be made to the specification.
Manufacturer originated changes
This specification can be revised by the seller without the buyer's consent to incorporate development changes if such changes do not
adversely affect price, delivery, guaranteed performance of the WTG, or the interchangeability or replaceability requirements of this
specification.
Development changes
Development changes are changes considered necessary to improve the WTG, prevent delays or to ensure compliance with the
purchase agreement. The seller has to notify the buyer of all changes that are made as described in this section, by giving the buyer
revised pages for this specification on a periodic basis.

5
4
3
2
1
Figure 1‐1:
Hub height
Rotor height
Tower height
Rotor diameter
Ground top level

Technical data
Revision 02 | 2012‐02‐21 | PDG‐CD‐S‐PDO‐00822 | Public

WIND TURBINE GENERATOR TECHNICAL SPECIFICATION | Technical data
Dimensions of wind turbine generator (WTG)
80.0 m
79.0 m
77.5 m
95.0 m
89.0 m
87.6 m
90.0 m
97.7 m
96.2 m
100.0 m
S95‐2.1 MW
4 /17
WIND TURBINE GENERATOR TECHNICAL SPECIFICATION | Technical data S95‐2.1 MW
Description Information
Wind class IIa
WTG certification Germanischer Lloyd (according to GL guideline 2003)
Estimated service life 20 years
Ambient temperature range – operation STV: –10 °C to +40 °C LTV: –30 °C to +40 °C
Beyond the temperature ranges stated above, a WTG may shut down if any of its core
equipment moves outside its safe operating range. This is dependent on WTG load as
well as on external conditions.
Ambient temperature range – general STV: –20 °C to +50 °C LTV: –40 °C to +50 °C
The WTG always has to be connected to the grid.
Ice/snow on blades Considered in calculation of structural design
A‐factor 9.59 m/s
Form factor, c 2.0
Annual average wind speed 8.5 m/s
Vertical average shear component 0.2
Extreme wind speed (10‐minute average) 42.5 m/s
Survival wind speed (3‐second average) 59.5 m/s
Automatic stop limit (10‐minute average) 25.0 m/s
Characteristic turbulence intensity 18.0%

according to IEC 61400 (15.0 m/s)
Air density 1.225 kg/m³
Altitude 1000 m above sea level
Humidity conditions
Permissible relative ambient humidity 30 to 99%
Permissible relative humidity during 30 to 99% (no precipitation)

operation (outside cabinet, inside WTG)
Permissible relative humidity during 20 to 80% (no precipitation)

operation (inside cabinet)
Revision 02 | 2012‐02‐21 | PDG‐CD‐S‐PDO‐00822 | Public 5 /17

Corrosion protection
The corrosion protection applies in accordance with ISO 12944‐2.
Corrosion protection class C4 (long)
Corrosion protection Anti‐corrosion paint
Lightning protection
The lightning protection applies in accordance with IEC 61400‐24, 62305‐1, 3, 4 and DIN EN 50164‐1, 2. The lightning protection
system is based on the lightning protection zone concept.
Rotor Lightning rod
Blades Lightning receptors on blade surface, spark gap for protection of blade bearing
Nacelle Spark gaps, lightning rods, EMC (electromagnetic compatibility), protection mesh
Grid connection
Find further and more detailed information in the document "Grid connection".
TN‐C‐S System
Voltage range (continous operation) 90%‐110%
Current range (nominal) ~ 2000 A
Overcurrent protection via SUZLON CONTROL SYSTEM and air circuit breaker
Frequency range (continous operation) –6% to +5% | 47 Hz ≤ f ≤ 52.5 Hz
Voltage harmonics Total harmonic content of the grid voltage has to be less than 3% of fundamental
frequency and less than 1% for any single harmonic.
Low Voltage Ride Through (LVRT) applicable
High Voltage Ride Through (HVRT) applicable
Tonality
The tonality applies according to the noise curve.

Quality standard
ISO 9001
1.1 Operating data
Rated power 2.1 MW
Rotor speed 12.1 to 17.6 rpm
Power regulation Active pitch regulated
Rated wind speed 11.0 m/s (without turbulence intensity according to GL guideline)
Cut in wind speed (30‐second average) 3.5 m/s
Cut out wind speed (3‐second average) 34.0 m/s
Cut out wind speed (10‐minute average) 25.0 m/s
Restart wind speed (10‐minute average) 23.0 m/s
Control
Type Programmable Logic Controller with SUZLON CONTROL SYSTEM software
Communication system Internal: CAN‐bus
External: Ethernet, optional: MODBUS, OPC
Access Multi‐level, user authenticated

Power curve *
Annual average energy yield 9439,8 MWh/a (average wind speed of 8 m/s p.a.)
Figure 1‐2: Power curve

The released power curve is created according to IEC 61400‐12 guidelines. The actual power curve on specific sites
varies due to site‐specific conditions.
Wind speed vHub [m/s] Electrical power [kW] Energy yield [MWh/a] Cp [‐] Ct [‐]
3,00 0,0 0,0000 0,0000
3,50 2,6 0,8 0,0139 0,9568
4,00 52,3 16,7 0,1881 0,9275
4,50 122,5 42,1 0,3097 0,8986
5,00 206,4 74,8 0,3803 0,8754
5,50 304,0 114,5 0,4209 0,8515
6,00 414,9 160,2 0,4425 0,8387
6,50 539,5 210,8 0,4525 0,8399
7,00 683,1 267,1 0,4587 0,8409
7,50 839,2 325,0 0,4582 0,8354
8,00 1010,0 383,5 0,4544 0,8151
8,50 1197,1 441,6 0,4490 0,7815
9,00 1393,2 494,8 0,4402 0,7430

9,50 1592,4 539,9 0,4278 0,7030

10,00 1787,7 574,0 0,4118 0,6618
10,50 1931,2 582,4 0,3843 0,6076
11,00 2016,3 566,9 0,3489 0,5352
11,50 2068,3 538,0 0,3132 0,4631
12,00 2096,4 500,9 0,2794 0,4005
12,50 2109,2 459,5 0,2487 0,3474
13,00 2114,0 417,1 0,2216 0,3031
13,50 2116,5 375,5 0,1982 0,2668
14,00 2116,2 335,4 0,1776 0,2368
14,50 2116,0 297,5 0,1599 0,2115
15,00 2115,8 262,2 0,1444 0,1901
15,50 2115,0 229,5 0,1308 0,1717
16,00 2114,5 199,6 0,1189 0,1558
16,50 2114,2 172,5 0,1084 0,1419
17,00 2113,8 148,1 0,0991 0,1298
17,50 2112,2 126,4 0,0908 0,1190
18,00 2111,2 107,1 0,0834 0,1096
18,50 2110,5 90,3 0,0768 0,1012
19,00 2109,8 75,6 0,0709 0,0936
19,50 2107,3 62,9 0,0655 0,0869
20,00 2105,5 52,0 0,0606 0,0808
20,50 2104,4 42,8 0,0563 0,0753
21,00 2103,2 34,9 0,0523 0,0703
21,50 2102,0 28,4 0,0487 0,0658
22,00 2096,4 22,9 0,0453 0,0616
22,50 2092,8 18,3 0,0423 0,0579
23,00 2091,2 14,6 0,0396 0,0545
23,50 2089,7 11,6 0,0371 0,0513
24,00 2088,2 9,2 0,0348 0,0485
24,50 2086,6 7,2 0,0327 0,0458

25,00 2084,9 5,6 0,0307 0,0434

1.2 Tower
Material Welded steel plate according to EN 10025
Colour RAL 9003
Internals Ladder, platforms, anchorage points, cabling, lights, emergency light, climbing
assistance (optional), service lift (optional)
Foundation Project‐specific
Tower height 77.5 m 87.6 m 96.2 m
Top end diameter 3.02 m 3.02 m 3.02 m
Bottom end diameter 4.30 m 4.55 m 4.30 m
1.3 Nacelle
Colour RAL 9003, RAL 5021
Main frame
Type Cast frame
Material EN‐GJS‐350‐22U‐LT
Main shaft
Type Forged shaft and flange
Material 42CrMo4/42CrMoS4
Main bearing
Bearing type Spherical roller bearing
Housing type Cast housing, flanged feet
Housing material EN‐GJS‐350‐22U‐LT

Heating STV: no fan heater LTV: one fan heater, power: 9 kW
Lubrication Automatic lubrication system
Tank capacity: 8 l
Gearbox
Type 1 planetary stage, 2 helical stages
Housing material Cast
Gearbox mount material EN‐GJS‐350‐22U‐LT/EN‐JS 1019
Shaft seals Maintenance‐free labyrinth seals
Cooling Forced oil cooling lubrication system
Mechanical power 2.250 MW
Heating STV: no fan heater LTV: two fan heaters, power: 9 kW each
Gear ratio 1:98.8 (±0.5)
Gear ratio of each stage 1. stage: 5.68 2. stage: 3.86 3. stage: 4.50
Gearbox – electric oil pump
Voltage (phase to phase) 3 × 690 V
Oil capacity 410 l
Mechanical brake
Type Hydraulic disc brake, activated by hydraulic pressure (active brake)
Brake disc Steel
Mounted on high speed shaft (HSS)
Hydraulic power unit
Power 1.5 kW

Maximum hydraulic pressure Hydraulic brake: 115 bar
Rotor lock system: 700 bar
Oil capacity 0.0045 m³ (4.5 litres)
Heating STV: no fan heater LTV: one fan heater, power: 9 kW
Coupling
Type Flexible coupling
Yaw system – yaw bearing
Type Friction bearing with gear rim
Yaw system – yaw drives
Type Electric asynchronous motor, electric motor brake (spring‐applied), 5‐stage planetary
gear box with output pinion
Quantity 4
Yaw speed 22.0 °/min
Rated output power 3.0 kW per drive
Generator
Type Asynchronous 3‐phase induction generator with slip rings operated with rotor circuit
inverter system (DFIG)
Rated frequency 50 Hz (+5%/–6%)
Number of poles/synchronous speed 4/1500 rpm
Speed at rated power rotor short‐circuited: 1511 rpm
Operation speed range 1200 to 1800 rpm
Rated generator speed 1568 rpm
Efficiency 96.8%
Max. rotor slip ±20.0%
Power factor (compensated) 0.94 lagging to 0.94 leading

Cooling IC6A1A6 (as per IEC 60034‐6), air‐cooled; forced air‐air cooled
Winding connection of stator/rotor Delta (Δ)/Star (Y)
Rated power 2.1 MW
Apparent power 2.265 MVA
Locked rotor voltage rotor short‐circuited: 3300 V
Rated voltage ‐ rotor DFIG operation: 220 V
Rated voltage ‐ stator 690 V/±15%
Rated current ‐ rotor rotor short‐circuited: 385 A DFIG operation: 390 A
Rated current ‐ stator rotor short‐circuited: 1895 A DFIG operation: 1785 A
No‐load current rotor short‐circuited: 340 A
Starting current rotor short‐circuited: 12317.5 A
Starting current (full load) rotor short‐circuited: 6.5 A
Maximum current to grid connection DFIG operation: 2150 A

(stator current)
Reactive power absorbed without load rotor short‐circuited: 405 kVAr
Reactive power absorbed at rated power rotor short‐circuited: 890 kVAr
Sub‐synchronous speed for DFIG 1205 to 1500 rpm
Reactive power curve as a function of active

power

Load in % of rated active power 25 50 75 100
Power factor without compensation 0.74 0.88 0.91 0.92
Power factor with compensation Variable

0.94 cap.
1 – 0.94 ind.
Stator resistance (Rs) starting and operation: 0.0065 per unit
Rotor resistance (Rr) starting: 0.0083 per unit operation: 0.0074 per unit
Stator reactance (Xs) starting: 0.0851 per unit operation: 0.0972 per unit
Rotor reactance (Xr) starting: 0.0686 per unit operation: 0.1049 per unit
Magnetising reactance (Xm) starting: 1.8672 per unit operation: 5.572 per unit
Magnetising reactance (Rfe) 131 Ω
Generator rotor type Wound rotor, bar winding
Damping ratio 1128 Nm/rpm
Mass moment of inertia Approx. 195 kgm²
Protection class IP 54 (slip ring IP 23)
Thermal classification Class H
Lubrication Automatic lubrication system
Tank capacity: 1 l
Converter section
Technology IGBT
Operation range of converter/generator: ±20%

slip range
Nominal slip Depends on power curve
Protection class IP 54
Cooling Liquid
Temperature range of coolant inlet 25 °C to 60 °C (operation)
Maximum flow of coolant Approx. 120 l/min with approx. 1 bar pressure drop

Maximum IGBT power loss in form of heat 18 kW

during continous operation
Rated current Line side converter: 500 A, machine side converter: 435 A
Rated voltage Line side converter: 690 V, machine side converter: 690 V
Voltage range Line side converter: 690 V/±10%, machine side converter: 0 to 760 V
Rated frequency Line side converter: 50 Hz, machine side converter: 10 Hz
Switching frequency Line side converter: 4500 Hz, machine side converter: 2250 Hz (≥1.2 Hz), 1125 Hz
(<1.2 Hz)
Frequency variation capability –6% to +5%
1.4 Rotor
Rotor cone angle 5°
Rotor speed at rated power 15.83 rpm
Tip speed at rated power 78.7 m/s
Main shaft tilt angle 5°
Power regulation DFIG inverter system
Rotor orientation Upwind
Colour (rotor with blades) RAL 9003
Hub
Type Cast spherical hub
Material EN‐GJS‐350‐22U‐LT
Mass moment of inertia n/a
Blades
Type SUZLON SB46
Quantity 3

Length 46.3
Material Glass‐fibre reinforced plastic (GRP)/Epoxy
Mass moment of inertia n/a
Type of aerodynamic brake Pitch/full blade
Profiles Risoe B
Pitch system
Type Electric asynchronous motor with forced ventilation unit, electric motor brake (spring‐
applied), 3‐stage planetary gear box with output pinion, frequency converter and
batteries
Pitch angle range (operating range) 0 to 90°
Pitch system – blade bearing
Type Double row ball slewing bearing
Lubrication Blade bearing/teeth: automatic lubrication system
Tank capacity: blade bearing: 8 l, teeth: 4 l
Pitch system – pitch drives
Type Electric asynchronous motor with forced ventilation unit, electric motor brake (spring‐
applied), 3‐stage planetary gear box with output pinion
Quantity 3 (1 per blade)
Pitch speed 0 to 8 °/s
Emergency pitch speed 8 °/s
Rated output power 7.5 kW per drive
Pitch system – pitch batteries
Quantity 1 battery box per blade
Service life 2 to 4 years
Rated voltage per battery 12 V
Rated capacity (20 hour rate) 7.2 Ah
Heater Each battery box equipped with 4 heaters (120 W each) and 2 fans

Thermal insulation Thermal insulation tiles
1.5 Transformer
The scope of supply of the transformer is agreed by contract. If the transformer is supplied by the customer the below
values are to be referenced as recommendations.
Type Oil filled transformer
Winding connection Delta (Δ)/Star (Y)
Vector group Dyn5/Dyn11 (grid‐dependent)
Rated apparent power 2500 kVA
Tapping At HV ±5% in 2.5% steps India: At HV ±6% in 3.0% steps
Reactance 6% India: 6.25%
No‐load losses ~ 2550 W
Full load losses ~ 22500 W
Total losses ~ 25000 W
Rated winding ratio (XX) kV/0.69 kV
Voltage level at line side depends on supply voltage level.

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ANNEX 8

WIND TURBINE GENERATOR TECHNICAL SPECIFICATION S95‐2.1 MW

Revision 02 | 2012‐02‐21 | PDG‐CD‐S‐PDO‐00822 | Public 3/17

WIND TURBINE GENERATOR

SUZLON Energy GmbH

Revision Name/Date Page Change aspect (by buyer, manufacturer or developer)

Revision 02 | 2012‐02‐21 | PDG‐CD‐S‐PDO‐00822 | Public 2/17

Ground top level

Revision 02 | 2012‐02‐21 | PDG‐CD‐S‐PDO‐00822 | Public

Dimensions of wind turbine generator (WTG)

Wind class IIa

WTG certification Germanischer Lloyd (according to GL guideline 2003)

Estimated service life 20 years

The WTG always has to be connected to the grid.

Ice/snow on blades Considered in calculation of structural design

A‐factor 9.59 m/s

Form factor, c 2.0

Annual average wind speed 8.5 m/s

Vertical average shear component 0.2

Extreme wind speed (10‐minute average) 42.5 m/s

Survival wind speed (3‐second average) 59.5 m/s

Automatic stop limit (10‐minute average) 25.0 m/s

Characteristic turbulence intensity 18.0%

Air density 1.225 kg/m³

Altitude 1000 m above sea level

Permissible relative ambient humidity 30 to 99%

Permissible relative humidity during 30 to 99% (no precipitation)

Permissible relative humidity during 20 to 80% (no precipitation)

Revision 02 | 2012‐02‐21 | PDG‐CD‐S‐PDO‐00822 | Public 5 /17

The corrosion protection applies in accordance with ISO 12944‐2.

Corrosion protection class C4 (long)

Corrosion protection Anti‐corrosion paint

Rotor Lightning rod

Voltage range (continous operation) 90%‐110%

Current range (nominal) ~ 2000 A

Frequency range (continous operation) –6% to +5% | 47 Hz ≤ f ≤ 52.5 Hz

Low Voltage Ride Through (LVRT) applicable

High Voltage Ride Through (HVRT) applicable

The tonality applies according to the noise curve.

Revision 02 | 2012‐02‐21 | PDG‐CD‐S‐PDO‐00822 | Public 6 /17

1.1 Operating data

Rated power 2.1 MW

Rotor speed 12.1 to 17.6 rpm

Power regulation Active pitch regulated

Cut in wind speed (30‐second average) 3.5 m/s

Cut out wind speed (3‐second average) 34.0 m/s

Cut out wind speed (10‐minute average) 25.0 m/s

Restart wind speed (10‐minute average) 23.0 m/s

Type Programmable Logic Controller with SUZLON CONTROL SYSTEM software

Communication system Internal: CAN‐bus

External: Ethernet, optional: MODBUS, OPC

Access Multi‐level, user authenticated

Revision 02 | 2012‐02‐21 | PDG‐CD‐S‐PDO‐00822 | Public 7 /17

Figure 1‐2: Power curve

3,00 0,0 0,0000 0,0000

3,50 2,6 0,8 0,0139 0,9568

4,00 52,3 16,7 0,1881 0,9275

4,50 122,5 42,1 0,3097 0,8986

5,00 206,4 74,8 0,3803 0,8754

5,50 304,0 114,5 0,4209 0,8515