IT94-3 HESG440310R2 ABB distributed control system industrial DCS module card

Description

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Overloadability – flexibility in load handling or
minimizing footprint for mobility.
In a typical transformer design, the insulation
system limits the highest temperature at which
the conductors and metallic parts can operate.
For a conventional system with mineral oil and
thermally upgraded cellulose insulation, the highest
temperature allowed is 105 °C for the oil and 120 °C
for the conductor →4. Higher MVA supplied for the
same footprint would mean higher temperatures
in the transformer, which shortens its lifetime. To
achieve higher MVA in the same or smaller footprint,
the transformer would need to be designed
using high-temperature insulation materials.
Such materials, like ester liquids and ester-liquid
impregnated cellulose, allow operation at higher
temperatures without appreciable deterioration
of the insulation system. Also, there should be
no additional risk of failure from operating the
transformer at higher temperatures.
For transformers insulated with thermally
upgraded cellulose and ester liquid, the limit for
the top oil temperature is 130 °C and the hotspot
temperature under normal cyclical loading can be
as high as 140 °C. The only limiting factors will be
transformer components such as tap changers
or bushings, which will also have to sustain much
higher temperatures.
Consequently, low- and medium-power
transformers with ester liquids can be
overloaded continuously by an average of 25
percent without negative impact on their lifetime.
In combination with Aramid insulation – a hightemperature insulation paper material that can
be used up to 200 °C – the overloadability of
such transformers can be even higher without
appreciable loss of life. This combination leads
to the ultimate value proposition for end users:
transformers with the same performance but
with a much smaller footprint.