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Dry type transformers Zaragozahi-T Plus

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Index

ABB S.A. Zaragoza: Brief introductionReinforced insulation transformers: hi-T Plus

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Asea Brown Boveri S.A. ZaragozaThe 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 40.000 m2.

Built surface 15.000 m2.

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Asea Brown Boveri S.A. ZaragozaThe 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 14001 since 2000.

Test room certificate ISO 17025 since 2001.

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hi-T Plus conceptIntroduction

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.

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hi-T Plus conceptThe 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.

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hi-T Plus conceptOverloading capabilities

hi-T Plus transformers can be continuously overloaded under normal operation without ageing impact even at full rated power.

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hi-T Plus conceptAdvantages 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).

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hi-T Plus conceptAdvantages 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.

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hi-T Plus conceptH/H or F/H with 100K temperature rise?

F/H with 100 K.

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.

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hi-T Plus conceptConclusions

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.

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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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