Title :
Dielectric Behavior and Stabilization of Insulation Oils in EHV Current Transformers
Author :
Duval, M. ; Crine, J.-P.
Author_Institution :
Institut de recherche d´´Hydro-Québec Varennes, Canada
fDate :
4/1/1985 12:00:00 AM
Abstract :
The causes of a number of explosions of EHV current transformers in service on the Hydro-Qu6bec 765 kV network have been investigated. Thermal runaway related to unexpectedly high dielectric losses in one of the types of oils used was diagnosed. Electrical instability of the oil was related to dissolved-meta content rather than to conventional oxidation of the oil. A new way of stabilizing the oil is proposed, consisting in the addition of a metal deactivator in oil.
Keywords :
Current transformers; Dielectric losses; Dielectrics and electrical insulation; Moisture; Oil insulation; Oxidation; Petroleum; Power transformer insulation; Reactive power; Testing;
Journal_Title :
Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TEI.1985.348868
