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MIDEL 7131 has
been developed to the highest standard and is able to
absorb large amounts of moisture while retaining its strength
as an electrical insulator. It is important to understand
the differences between Midel and mineral oil in their
behaviour to moisture. The practical implications of these
differences are detailed in the datasheet "Moisture
Behaviour" below.
Enhancing the life of a
transformer
The insulation system in a fluid filled transformer is
made up of solid insulation (cellulose) and the liquid
dielectric.
The second largest cause of transformer failure has been
attributed to degradation of the transformer insulation.
Overloading, high temperature and moisture can cause cellulose
degradation. Once this degradation has started, cellulose
creates additional water as a by-product of its degradation.
This moisture, unless it can migrate out into the insulating
fluid, will be retained in the cellulose, creating a vicious
circle and further accelerating degradation.
MIDEL 7131 can safely absorb up to 10 times more moisture
than mineral oil, therefore greatly reducing one the main causes
of cellulose insulation degradation. For further information
see below case study entitled "Enhancing Transformer
Life".
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