Type Certification Process

Design Evaluation

The purpose of the design evaluation is to evaluate the wind turbine type as designed and documented in conformity with design requirements, specific standards and other technical requirements including:

  • Load assumptions
  • Safety systems
  • Rotor blades
  • Mechanical and structural components
  • Electrical systems
  • Tower
  • Foundation

Manufacturing Evaluation

The manufacturing evaluation is to ensure that a specific wind turbine type and its components are manufactured in conformity with the certified design. It is also a useful tool to provide traceability between designer, supplier and manufacturing sites. Evaluation includes:

  • Components, including gear boxes, generators, nacelles, towers, rotor blades, etc.
  • Substructure and foundation

Type Testing Evaluation

The purpose of the type testing evaluation is to verify such variables as wind turbine function, safety, structural integrity, power performance, power quality, and acoustic noise emission characteristics. Services include:

  • Mechanical load measurements
  • Power performance measurements
  • Safety and function test
  • Power quality measurements
  • Low voltage ride through (LVRT) test
  • Acoustic noise measurements

Inspection includes:

  • Static and dynamic blade test
  • Gearbox field test
  • Converter and generator type test
  • Commissioning

Final Evaluation and Certificate

UL issues a specific type/component certificate once the certification process is complete and the final evaluation is satisfactory.

Other supported certification schemes and requirements:

  • US: UL 6141 (large WT), UL 6142 (small WT)
  • Japan: JSWTA0001 (small WT)
  • UK: IEC 61400-2, MCS (small WT)
  • German type approval (DiBT)
  • Korean type approval (KEA Scheme)
  • IECRE