Converter transformer in HVDC offshore projects: an approach for risk assessment

Due to rising demand and supply chain limitations in HVDC technology, converter transformers must be meticulously designed and thoroughly tested to ensure long-term reliability. Among the various tests, short-circuit testing plays a crucial role in confirming the robustness of both the transformer’s design and fabrication process. As these tests are expensive and present planning risks for HVDC projects, IEC standard 60076-5 offers two verification options: a full-scale short-circuit test or a theoretical evaluation based on the manufacturer’s design rules, testing history, and construction experience. In addition, for HVDC projects under framework contracts, interchangeable and mutualized spares can optimize costs.