VOLTAGE REGULATED DISTRIBUTION TRANSFORMER WITH NEW VACUUM OLTC

High penetration of distributed generation is one of the main drives that alters the way how distribution system operators are perceiving distribution network's operation, maintenance, construction and development. New concept in the distribution network voltage regulation is the use of voltage regulated distribution transformers (VRDTs). This paper describes the basic technical design of VRDTs which utilizes a new generation of on-load tap-changers with vacuum technology as a replacement for classic no-load tap-changers. The paper also reports the results of routine, type and special transformer tests (IEC 60076) and possible outcome of the VRDT's application in public distribution networks.