Effects of DC Bias on power transformers

The brochure examines the impact of DC bias (including geomagnetically induced currents, GIC) on power transformers and provides guidance on proving the transformer’s withstand capability. It is written as a comprehensive guide, organized into eight systematically structured chapters, each addressing a specific topic such as Sources of DC bias, Effect of DC/GIC on power transformer, Modelling of the thermal response, DC testing setups for power transformers, Modelling transformers in power system studies, Design considerations, Monitoring and mitigation and Accessories.