Insulation Requirements of HVDC Systems with Particular Reference to External Insulation Performance and Relevant Research and Laboratory Tests.

摘要

The paper, while reviewing the more important aspects of HVDC insulating conditions, mainly focuses on the problems of external DC insulation in polluted conditions. The different causes of failure which are discussed are: thermal runaway, electrolytic effects inside the material and local increase of the electric field inside the material. The paper provides procedures for DC pollution tests at service voltage and reports results of pollution tests with composite voltages. A review is made of research in this area with the relevant test facilities. (ERA citation 14:004424)