Ms. Varli received her Master of Science from the Faculty of Electrical Engineering and Information Technology at the Technical University Dortmund and now works as Technical Product Manager for overhead line insulators at Amprion GmbH, one of the German TSOs. She contributes to CIGRE Working Groups related to material properties of polymeric materials for HV applications as well as several groups concerned with overhead line and is also active in IEC TC 36.
Germany’s goal of increasing energy from renewable sources will require expansion of the grid in spite of public opposition to new lines. Use of DC links has therefore been proposed and, as a first step, existing OHLs should become hybrid. This implies need for new conductors and insulators as well as their proper corresponding design. Insulators in particular require a close look since they show different behavior under DC than under AC stress. This presentation will review the methodology and findings of a program to develop new hybrid overhead lines, including types of tower and insulator configurations deemed best able to satisfy all requirements.