Original scientific paper
THERMAL STABILITY CHANGE OF SYNTHETIC ESTER-BASED TRANSFORMER OIL
Veronika Haramija
Dijana Vrsaljko
; KONČAR – Electrical Engineering Institute Inc.
Vedran Đurina
; KONČAR – Electrical Engineering Institute Inc.
Domagoj Vrsaljko
; University of Zagreb, Faculty Of Chemical Engineering And Technology
Abstract
For good transformer condition assessment it is necessary to determine the condition of
insulating materials, both liquid and solid. Transformer is reliable for as long as its insulation system
resists deterioration. Therefore, thermal and oxidation stability are important characteristics of transformer
oil. It is a measure of oil resistance for decomposition by the influence of oxygen and temperature. Oils
with good thermal and oxidation stability retain their characteristics regardless the thermal stress.
Because of environmental and safety issues, the use of synthetic ester-based transformer oils is
increasing. Although they have been in use in smaller transformers (distributive, traction, …) for decades,
limit values for chemical and physical characteristics are still discussed. New methods for thermal stability
evaluation can be useful for insulation condition assessment.
Keywords
transformer oil; synthetic ester; ageing; thermal properties; TGA; DSC
Hrčak ID:
199223
URI
Publication date:
15.8.2017.
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