Dry type transformers Zaragoza hiT Plus ABB Group

Dry type transformers Zaragoza hi-T Plus © ABB Group 2009 | Slide 1

Index ABB S. A. Zaragoza: Brief introduction Reinforced insulation transformers: hi-T Plus © ABB Group 2009 | Slide 2

Asea Brown Boveri S. A. Zaragoza The factory © ABB Group 2009 | Slide 3 § 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 m 2. § Built surface 15. 000 m 2.

Asea Brown Boveri S. A. Zaragoza The factory © ABB Group 2009 | Slide 4 § 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.

hi-T Plus concept Introduction © ABB Group 2009 | Slide 5 § 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.

hi-T Plus concept The basic data © ABB Group 2009 | Slide 6 § 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 k. V BIL. § 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 | Slide 7

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. § © ABB Group 2009 | Slide 8 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 § Specially designed for high harmonic content networks. § § © ABB Group 2009 | Slide 9 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 100 K temperature rise? § F/H with 100 K. § § © ABB Group 2009 | Slide 10 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.

hi-T Plus concept Conclusions © ABB Group 2009 | Slide 11 § 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.

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 | Slide 12