NWTC: Working With Industry: Certification: Documentation Required

Certification 

Documentation Required

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IEC 61400-22 Required 

Design Documentation 

The numbered elements represent required 

documentation. The unnumbered elements 

represent suggested information to be included in 
the required documentation.

 

Type of Documentation

Guidelines & 

SI Available

Drawings Analysis Specs    

1.0 General Turbine Description Document

 

 

This document should include the 

following information if applicable:

 

 

1.1 General Turbine Characteristics 

and Configuration Description

U

 

Turbine description and general 

specifications

U

U

 

Major component weights

U

 

Safety systems

U

 

Electrical power system

U

 

Electrical control system

U

 

Hydraulics and pneumatics

U

 

1.2 Summary Control Philosophy 

 

 

General control philosophy

U

 

Protection system

U

 

 

 

 

2.0 Design Control Quality System Document

U

ISO 9001 

Section 4.4 & 

4.5

 

 

 

3.0 Control and Protection System Document

 

 

Description and component 

specifications including transducers

U

U

U

 

Control system software

  

U

 

Detailed logic flow chart

U

U

 

Safety system fault logic description

U

U

 

Emergency shutdown

U

U

 

Logic testing documentation

U

 

 

Software release and version control

U

 

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NWTC: Working With Industry: Certification: Documentation Required

Overspeed sensing

U

U

 

Vibration sensing

U

U

 

Monitoring system

U

U

 

 

 

 

4.0 Loads and Load cases Document

 

IEC 61400-1 

Edition 2 

(Section 3 & 4)

 

NREL 

Significant 

Interpretations

4.1 Gen. analysis approach and system 

model description.

U

U

 

NREL Loads 

Guide

4.2 Document description and organization

U

 

 

4.3 System dynamics model description

 

 

Degrees of Freedom

U

 

 

Mass and Stiffness distributions

U

U

 

Aerodynamic inputs 

(airfoil tables, blade geometry, etc.)

U

U

 

4.4 Coordinate systems

U

 

 

4.5 Partial safety factors

U

U

 

4.6 Material properties

U

 

4.7 Model Validation

 

 

Analytical tests

U

 

 

Comparisons w/ test data 

U

 

 

4.8 Dynamic behavior of all major 

components and coupling of the system.

 

 

Campbell diagrams,

U

 

 

Spectral plots

U

 

 

Mode shapes & frequencies

U

 

 

Comparisons between predictions 

and measurements

U

 

 

4.9 Failure analysis (e.g. fault tree)

U

 

 

4.10 Load cases 

(from IEC 61400-1 plus any abnormal 

cases)

 

 

Extreme loads

U

 

 

Fatigue load cases

U

 

 

Fault loads 

U

 

 

4.11 Loads should be detailed for the 

following critical components:

 

 

Blade

U

 

 

Hub

U

 

 

Low speed shaft and bearings

U

 

 

Mainframe and gearbox structure

U

 

 

Gearing and drive train 

(including gen., brake & couplings) 

U

 

 

Tower top/yaw bearing

U

 

 

Tower 

U

 

 

Tower base connection to foundation

U

 

 

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NWTC: Working With Industry: Certification: Documentation Required

 

 

 

 

 

 

5.0 Structural Component Specification, 

Drawings and Strengths Calculations

 

 

5.1 System Level Descriptions

U

 

 

General Description

U

 

 

List of drawings and drawing system 

description.

(e.g. drawing tree)

U

 

 

Assembly drawings

U

 

 

5.2 Blade structure:

 

NREL Stress 

Guide / 

Material Guide

Blade root

U

U

 

 

Blade buckling

U

U

 

 

Blade/hub joint

U

U

 

 

Blade Pitch Bearing 

U

U

U

NREL Bearing 

Guide

Tip deflection analysis

U

 

 

Aerodynamic brake mechanism

U

U

U

 

5.3 Hub structure:

 

NREL Stress 

Guide / 

Material Guide

Hub

U

U

 

 

Teeter Pin

U

U

 

 

Teeter Housing

U

U

 

 

Hub/low speed shaft joint

U

U

 

 

5.4 Low speed shaft structure:

 

NREL Stress 

Guide / 

Material Guide

Low speed shaft bearings

U

U

 

 

5.5 Main frame structure:

 

NREL Stress 

Guide / 

Material Guide

Nacelle cover

U

U

 

 

Mainframe

U

U

 

 

Mechanical brake

U

U

U

 

Gearbox

U

U

 

 

Gearbox/mainframe connection

U

U

 

 

Gearbox/generator coupling

U

U

U

 

Brake (peak torque rating plus energy 

capacity)

U

U

U

 

5.6 Generator:

 

 

Generator/nacelle connection

U

U

 

 

5.7 Yaw mechanism:

 

 

Yaw bearing

U

U

U

NREL Bearing 

Guide

Tower top structure

U

U

 

 

Mainframe/yaw bearing connection

U

U

 

 

Yaw bearing/tower top connection

U

U

 

 

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NWTC: Working With Industry: Certification: Documentation Required

5.8 Tower structure:

 

NREL Stress 

Guide / 

Material Guide

Tower

U

U

 

 

Tower/foundation connection

U

U

 

 

 

 

 

6.0 Mechanical and Electrical Component 

Specification and Performance Analysis 

Documents

 

 

6.1 Mechanical Components

 

 

Transmission Gears, Bearings, Cooling, 

Filtering and Seals

U

U

U

NREL Gearbox 

Guide

Brakes (including power supply 

requirements)

U

U

U

 

Aerodynamic Braking Devices (including 

power supply requirements)

U

U

U

 

Yaw Drive (including power supply 

requirements)

U

U

U

 

Pitch system (including power supply)

U

U

U

 

Locking Devices (including power supply 

requirements)

U

U

U

 

Auxiliary systems power supply

U

U

U

 

6.2 Electrical Component drawings and 

technical specifications

 

UL Electrical 

Guide

One line diagram (basic power circuit 

with safety devices)

U

 

 

Full power circuit schematic

U

 

 

Electrical systems schematics

U

 

 

Turbine power schematic

U

 

 

Power Converter

U

U

U

 

Cable suspension

U

U

U

 

Cable twist

U

U

U

 

Grid connection

U

U

U

 

Generator system

U

U

U

 

Contactors

U

U

U

 

Grounding

U

U

U

 

Lightning Protection

U

U

U

 

 

 

 

 

 

 

7.0 Component Test Reports

 

 

7.1 Blade Structural Tests

U

 

IEC 61400-23

 

 

 

 

 

 

 

 

 

8.0 Plans / Manuals

 

 

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NWTC: Working With Industry: Certification: Documentation Required

Specifications for how the turbine must 

be installed, operated and maintained 

are based on design on detailed 

engineering 

plans. These plans provide the rational 

for the various operations are 

considered separate and different 

documents than basic instruction 

manuals. These documents should 

contain both the plans and the resulting 

manuals.

 

 

8.1 Operating Plan & Manual

  

U

U

NREL 

Commissioning 

Guide

8.2 Maintenance Plan & Manual

U

U

NREL 

Commissioning 

Guide

8.3 Safety Plan & Manual

U

U

 

Fire protection

U

U

 

Protection from falling objects

U

U

 

Climbing provisions

U

U

 

Warning signs

U

U

 

Escape routs

U

U

 

Guarding

U

U

 

Securing points

U

U

 

Emergency lighting

U

U

 

High voltage equipment

U

U

 

8.4 Installation Plan & Manual

U

U

NREL Commis-

sioning Guide

 

  

 

 

 

   

  

 

 

9.0 Type Testing

  

U

 

 

9.1 Safety Test and Dynamic Behavior Test 

Report

   

U

 

IEC 61400-22

9.2 Structural Load Test Report

U

 

NREL Loads 

Test Procedure

 

 

 

10.0 Turbine Characteristics Testing

  

U

 

 

10.1 Power Performance Test Report

U

 

IEC 61400-12

10.2 Acoustic Emissions Report

U

 

IEC 61400-11

10.3 Power Quality Test Report

U

 

IEC 61400-21

  

 

 

 

  

 

 

 

 

 

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NWTC: Working With Industry: Certification: Documentation Required

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Prepared by

National Wind Technology Center

National Renewable Energy Laboratory

Operated for the 

U.S. DEPARTMENT OF ENERGY

by the Midwest Research Institute 

Updated: November 01, 1998

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