INIIT03 ABB Bailey distributed control system industrial DCS module card

Description

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Mineral oil for transformer use was successfully
introduced in the 1970’s to replace the
polychlorinated biphenyls (PCB) that were
progressively banned due to their hazardous
impact on human and environmental health.
Despite the extensive safety history of oil-filled
transformers, mineral oil has a relatively low
flash point (170°C); a property that can result in
catastrophic fires and explosive failures under rare
conditions – causing concerns.
During the late 1980’s ester oils, or seed oils, were
investigated as an alternative fluid for transformers
to diminish these risks. Natural esters have a higher
flash point (330-360°C) than mineral oils; this allows
the transformer to operate at higher temperature
rises (up to a maximum 75°C rise) and greatly
increases their fire safety ratings. Further, ester oils
are renewable, non-bio-accumulating and non-toxic
and are potentially biodegradable.
Transformer oil risks
Despite the risk mitigation achieved by using ester
oil instead of mineral oil, measurable risks still exist:
all oils have flashpoints, and therefore pose
a fire or explosion risk; and all oils can leak and
present a risk to humans and the environment.
As previously stated, mineral-oil and esters, both
synthetic and natural oils, are characterized by flash
points of 170°C and 330-360°C, respectively [1].