1. Dry type transformers Zaragoza hi-T Plus
© ABB Group 2009
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2. Index ABB S.A. Zaragoza: Brief introduction
Reinforced insulation transformers: hi-T Plus
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3. Asea Brown Boveri S.A. Zaragoza The factory
Oil transformers from 1950 until 1999.
Dry type transformers since 1981.
Focus factory for cast coil transformers since 2000.
Leading Spanish manufacturer.
Total surface m2.
Built surface m2.
© ABB Group 2009
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4. Asea Brown Boveri S.A. Zaragoza The factory
200 employees.
The only ABB cast coil focused factory for Europe, Africa and Middle East, Central and South America.
Certificate ISO 9001 since 1995.
Certificate ISO since 2000.
Test room certificate ISO since 2001.
© ABB Group 2009
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5. hi-T Plus concept Introduction
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.
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.
© ABB Group 2009
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6. hi-T Plus concept The basic data
Insulation suitable for temperatures up to 180 ºC and 220 ºC as hot spot.
Transformer temperature rise limited to 100 K at full load.
Suitable for saline atmospheres.
Vibration proof.
Design tested up to 250 kV BIL.
Optional design up to –40 ºC.
© ABB Group 2009
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7. 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.
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8. hi-T Plus concept Advantages for distribution applications
Increased insulation lifetime.
More than 4 times higher compared to a standard transformer.
Most reliable High Voltage design in the market.
No unexpected alarm / trip problems.
Able to work at full load under extremely high summer conditions or high temperature environments (mills, machine chambers).
© ABB Group 2009
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9. hi-T Plus concept Advantages for special applications
Specially designed for high harmonic content networks.
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.
© ABB Group 2009
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10. hi-T Plus concept H/H or F/H with 100K temperature rise?
High Voltage coil is in class F (100 K temp. rise limit).
No life advantage in the most critical part of the transformer.
No overloading possibility.
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.
© ABB Group 2009
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11. hi-T Plus concept Conclusions
hi-T Plus transformer has a much higher working life than a class F transformer.
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.
© ABB Group 2009
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12. hi-T Plus at a glance
Applications where the installation of a hi-T Plus option is not only competent but also worthy.
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13. © ABB Group 2009
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