DNV DNV-RP-0440 PDF

Scope and application

The recommended practice is applicable to all types of wind turbines (e.g. direct drive concepts, doubly-fed induction generators, low and high power output ratings, horizontal and vertical axis installations, with or without power converters) designed according to IEC 61400-1.

The recommended practice is applicable to the design, manufacturing, installation and testing of the wind turbines’ electrical systems. This mainly refers to:

— rotating electrical machines

— power transformers

— frequency converters

— low-voltage switchgears, control gears and switchboards

— high-voltage switchgears

— lightning protection, earthing and bonding

— electrical equipment for measurement and control use

— cables, lines and accessories

— safety-related parts of the control system

— uninterruptible power systems (UPS)

— interconnection of electrical equipment

— installation of the wind turbine and its components and systems.

Wind turbines and their electrical components and systems shall be designed concerning EMC as to:

— reach a specific level of operational safety of the wind turbine during energy production or the event of faults

— keep the wind turbines’ emission to the environment within tolerable levels

— avoid that disturbing sources are interfering with other sub-systems or components of the wind turbine leading to malfunction of single components or loss of control.