Dry type transformers Zaragoza
hi-T Plus
© ABB Group 2009
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Index
ABB S.A. Zaragoza: Brief introduction
Reinforced insulation transformers: hi-T Plus
© ABB Group 2009
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Asea Brown Boveri S.A. Zaragoza
The factory
© ABB Group 2009
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Oil transformers from 1950 until 1999.

Dry type transformers since 1981.
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Focus factory for cast coil transformers since
2000.
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Leading Spanish manufacturer.
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Total surface 40.000 m2.
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Built surface 15.000 m2.
Asea Brown Boveri S.A. Zaragoza
The factory
© ABB Group 2009
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200 employees.
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The only ABB cast coil focused factory
for Europe, Africa and Middle East,
Central and South America.
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Certificate ISO 9001 since 1995.
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Certificate ISO 14001 since 2000.
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Test room certificate ISO 17025 since
2001.
hi-T Plus concept
Introduction
© ABB Group 2009
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Nowadays, special applications such as rolling
mills, paper mills, traction systems... require the
most demanding conditions for operations.

Harmonic currents, present on distribution lines can
cause overheating and saturations difficult to
quantify, that forces to oversize the transformers.
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Overloading due to extreme operation conditions
can also decrease a standard transformer lifetime if
not correctly considered.

Hot ambient temperatures in summer conditions
can create unexpected trips in the distribution line
and deteriorate the insulation.

ABB has developed a new transformer concept,
adding to ABB transformers known performance the
advantages of the class H insulation to overcome all
these possible problems.
hi-T Plus concept
The basic data
© ABB Group 2009
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Insulation suitable for temperatures up to 180 ºC
and 220 ºC as hot spot.

Transformer temperature rise limited to 100 K at
full load.
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Suitable for saline atmospheres.
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Vibration proof.
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Design tested up to 250 kV BIL.
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Optional design up to –40 ºC.
hi-T Plus concept
Overloading capabilities
hi-T Plus transformers can be
continuously overloaded under
normal operation without ageing
impact even at full rated power.
© ABB Group 2009
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hi-T Plus concept
Advantages for distribution applications
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Increased insulation lifetime.
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More than 4 times higher compared to
a standard transformer.
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Most reliable High Voltage design in
the market.
No unexpected alarm / trip problems.

© ABB Group 2009
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Able to work at full load under
extremely high summer conditions or
high temperature environments (mills,
machine chambers).
hi-T Plus concept
Advantages for special applications
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Specially designed for high harmonic
content networks.
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© ABB Group 2009
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Able to withstand additional losses
generated by non foreseen harmonics
without life impact.
Able to work under sudden overloads
without life impact or temperature
alarms.

Certain applications such as rolling
mills generate current peaks that can
be higher than expected under special
production conditions.

Transformers without special oversize
will face deterioration if not used at
lower ratings afterwards, affecting to
plant production.

Class H transformers allow continuous
operation after overload without
thermal ageing in insulations.
hi-T Plus concept
H/H or F/H with 100K temperature rise?
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F/H with 100 K.
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High Voltage coil is in class F
(100 K temp. rise limit).

No life advantage in the most critical part of
the transformer.
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No overloading possibility.
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In case of higher harmonics High Voltage will
deteriorate faster than Low Voltage creating a
weak point in a non-repairable part.
To achieve a similar behavior as hi-T Plus
transformer, High Voltage shall be designed for
75 K temp. rise, with a high price impact and
higher dimensions.
hi-T Plus concept
Conclusions
© ABB Group 2009
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hi-T Plus transformer has a much higher
working life than a class F transformer.
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hi-T Plus transformer saves production costs
due to unexpected trips due to high temperature
(summer periods, air conditioner failures).

hi-T Plus transformers can work in high
harmonic content networks without over
temperature problems or insulation degradation.

hi-T Plus transformers can be overloaded under
normal operation without further reduction of
power.
hi-T Plus at a glance
Applications
where the
installation of a
hi-T Plus option is
not only
competent but
also worthy.
© ABB Group 2009
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© ABB Group 2009
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