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MIDEL 7131 has been extensively used to retrofill
PCB and mineral oil filled transformers
worldwide.
Retrofilling is carried out to improve the service life
or reliability of a transformer, eliminate environmental
hazards or improve fire safety.
MIDEL 7131 is fully miscible with mineral oil.
Even with up to 5.5% residual mineral oil a Midel retrofilled
transformer retains its high fire point K-Classification
(300°C).
Volker Wasserberg, an independent
consultant concludes in his paper “Retrofilling
Transformers – Facts and Arguments”
“Ester
liquids are of high hygroscopicity, thus the solid
insulation immersed therein is kept dry. The aging
rate is lower, thus also increasing the operation
reliability of the transformer.
The firepoint of ester liquids is much higher than
those of mineral insulation oils. In case of transformer
vessel rupture due to electrical fault no pool fire
occurs. In case of external fire the smoke, originating
from the ester liquid is low.
As the synthetic ester contains no sulphur or mercaptanes
the initiation of organic acids is minimised. Solid
insulation aging is thus further reduced.”
For more information on any of these topics please consult
our Technical Datasheets or the further information reports
below.
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