Challenges for Reliable Offshore Transformers

Wind energy remains the front-runner in the increased use of renewable energy. In the quest for cost-efficient wind energy, the constant availability of strong winds is crucial for every project. This is why, after coastal regions and high mountains, it is important to explore, develop and install near-shore and offshore wind projects. The first 2MW onshore turbines suffered from transformer reliability concerns around 2002. The problems due to vibrations, electric switching surges and overloading were investigated and designs were changed accordingly. Since 2004, step by step, wind energy has increasingly moved offshore.? Again, some reliability concerns were discovered and equipment was replaced. This article summarises the need for higher specifications and more reliable transformers in order to prepare the wind industry business for sustainable growth in offshore multi-megawatt turbines.