Title :
Assessment of thermal aging of HVDC converter transformer insulation
Author :
Grant, D.H. ; McDermid, W.
Author_Institution :
Manitoba Hydro, Winnipeg, Man., Canada
Abstract :
An HVDC converter transformer was removed from service and salvaged after 24 years of service. It had not experienced an in-service failure, although others from the same family had failed as a result of overheating. The salvage of the transformer provided an opportunity to observe signs of overheated cellulose, to take paper samples for DP measurements, and to assess the mechanical strength of the bonded CTC.
Keywords :
HVDC power convertors; ageing; insulation testing; mechanical strength; polymerisation; power transformer insulation; power transformer testing; thermal insulation; DP measurement; HVDC converter transformer insulation; bonded CTC; continuously transposed conductor; degree of polymerization measurements; mechanical strength; overheated cellulose; thermal aging; Aging; Bonding; Coils; HVDC transmission; Leg; Oil insulation; Petroleum; Power transformer insulation; Transformer cores; Valves;
Conference_Titel :
Electrical Insulation, 2004. Conference Record of the 2004 IEEE International Symposium on
Print_ISBN :
0-7803-8447-4
DOI :
10.1109/ELINSL.2004.1380535
