DNV has been leading involvement in formal standardisation, through IEC (International Electrotechnical Commission) and European and national standards bodies. From this DNV takes the initiatives by developing DNV’s own standards in order to facilitate the use of the international standards.
This further allows DNV to:- Communicate DNV’s experience and expectations
- Cross reference to other DNV standards
- Provide consistent link between standards for wind turbines, offshore structures and other building codes
- Define the extent of and requirements for certification not covered by other codes.
IEC and ISO standards
The International Electrotechnical Committee IEC has specified type and project certification schemes for wind turbines in their IEC WT 01 document. DNV has based both the type and the project certification services for wind turbines on IEC WT 01 which refers to an extensive range of IEC technical standards for wind turbines. The current suite of standards includes:
- IEC 61400-1, Design requirements
- IEC 61400-2, Small wind turbines
- IEC 61400-11, Acoustic noise measurement techniques
- IEC 61400-12-1, Power performance measurements
- IEC 61400-13, Measurement of mechanical loads
- IEC 61400-14, Declaration of sound power level and tonality
- IEC 61400-21, Measurement of power quality characteristics
- ISO 81400-4, Wind turbines, Design and specification of gearboxes.
The following coming standards have been issued as draft documents:
- IEC 61400-3, Design requirements for offshore wind turbines
- IEC 61400-23, Full scale structural blade testing
- IEC 61400-24, Lightning protection.
DNV standards and guidelines
As a general introduction to design of wind turbines DNV and Risø National Laboratory in Denmark issued the text book “Guidelines for Design of Wind Turbines” in 2001.
The standard for offshore wind turbine support structures DNV-OS-J101 was first issued in 2004. Since then DNV contributed through an IEC committee to the IEC 61400-3 standard “Design requirements for offshore wind turbines” which included a development of the requirements to design loads. DNV-OS-J101 was updated in 2007 to cover this development and serve as an interpretation standard for IEC 61400-3.
The DNV-OS-J102 standard “Design and Manufacture of Wind Turbine Blades” was issued in 2007 and serves as a detailed interpretation of the basic requirements to blade design, manufacturing and testing in IEC 61400-1 and IEC 61400-23.
The DNV-OS-J102 standard “Design and Manufacture of Wind Turbine Blades” was issued in 2007 and serves as a detailed interpretation of the basic requirements to blade design, manufacturing and testing in IEC 61400-1 and IEC 61400-23.