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Dry-type transformers
TriDry transformers 100 to 2500 kVA Compact – efficient – safe
Compact
Applications Dry-type transformers from ABB stand for superior technical characteristics, rendering them suitable for a wide range of applications. Not containing any insulation liquids, they are safe, eco-friendly, reliable, and renowned for lengthy useful lifetimes. Dry-type transformers are an optimum solution for transformers that have to be installed near their place of use. They thus save installation outlay on cabling, while at the same time reduce losses in cables and terminals on the low-voltage side. They can be installed for utility, industrial and commercial applications and be found in substations, factories, mines, windmills, large public buildings like high rise buildings, hospitals, shopping malls, in drives and traction systems.
ABB TriDry transformers meet and exceed customer demands for premium transformers which meet stringent industry efficiency standards, while providing high standards of safety and dimensions. The ABB TriDry philosophy is based on an efficient use of material resources and energy, as well as safety, to meet the evolving needs of an increasingly environmentally minded world. The ABB TriDry transformer line provides premium features without premium cost. Advanced design and manufacturing technologies provide a transformer with markedly improved characteristics. No highly refined steel is required to achieve this performance.
1 ABB dry-type transformers for Shanghai financial centre | 2 ABB TriDry - advanced design with advanced technology | 3 ABB TriDry - the core material is used in a highly efficient manner due to a homogeneous loss distribution 1
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Efficient
Higher efficiency standards provide greater operating cost savings over the lifetime of the unit. The reduction in no-load losses provides energy savings even when the transformer is well below capacity.
ABB TriDry transformers feature a reduced total weight.
Higher efficiency standards The ABB TriDry transformer is a unit specifically designed to meet the more demanding efficiency of the CENELEC EN 50541-1 standard. All units meet at least the B0 class for no-load loss. The more efficient units reduce the operating cost of the transformer throughout it's lifetime and provide an affordable, environmentally friendly solution. Lighter, resource efficient units The ABB TriDry transformer saves on natural resources and reduces the energy required for production and transportation. Efficiency standards are met without the use of postprocessed steel.
Footprint of 1250 kVA transformer
Reduced dimensions For more demanding environments where space can be a premium, the ABB TriDry features a reduced length. The ABB TriDry footprint allows the transformer to be placed in a wider variety of locations with length restrictions. Most commonly it is the length restriction which influences transformer installations, whereas width is not a restricting parameter. ABB TriDry transformers have a reduced length in comparison to stacked design. In addition, the square footprint form factor allows for greater diversity in unit placement.
Safe
Measurements of the harmonic content in the excitation current of TriDry transformers indicate strongly reduced harmonics in comparison to standard stacked core transformers. The third harmonic is absent in the ABB TriDry transformer.
Reduced harmonics The unique design of the TriDry transformer reduces the harmonics in the transformer. The reduction in harmonics helps reduce additional transformer losses and reduces variability in the transformer output. Thus the quality of the network power is maintained and protection schemes can be more finely tuned. Reduced inrush current The ABB TriDry transformer features a magnetically symmetric wound core without perforations. This feature reduces the transformer inrush current which is particularly important for the integrity of multiple transformer banks and modern networked systems with sensitive safety features.
ABB tests for inrush current with positive and negative remanence bias in the core. Tests of similar units indicate a strongly reduced inrush current for the TriDry transformer.
The ABB TriDry transformer features vacuum cast coils which are non-flammable and moisture proof. The transformer is completely dry, it does not contain liquids which could leak or present a hazard during failure. The sides of the ABB vacuum cast coils are shear, reducing the surface area capable of accumulating particulate matter. The unique design reduces electromagnetic pollution around the transformer compared to the stacked design. ABB TriDry transformers have the reliability of ABB vacuum cast coil transformers, a contributing factor to ABB's position of global leadership in the electrical distribution market today.
Product range Standard range
400, 630, 800, 1000 kVA for primary voltage of 10 and 20 kV
Available range
100 to 2500 kVA for primary voltage up to 24 kV
Efficiency standards
CENELEC EN 50541-1
Specification guide The transformer shall be TriDry construction. The transformer shall be manufactured by a company which is certified to ISO 9001:1994, EN ISO 9001:1994, IEC60076-11-2004 for design and manufacture of Power, Distribution and Specialty Dry-type Transformers. A certificate of Compliance to this requirement shall be provided with the proposal. The transformer shall be rated ______ kVA with a primary voltage of _______ kV (delta, wye) connected and have a BIL rating of ______ kV and a secondary voltage of _____ V (delta, wye) connected and have a BIL rating of ______ kV. The transformer is to have an impedance (per manufacturer‘s standard, _____ %IZ.) The average temperature rise of the transformer windings shall be rated at (100 ˚C). The insulating system used, including epoxy, shall be rated 155 ˚C. The transformer shall not exceed the specified temperature rise when the unit is operated continuously at full nameplate rating. The transformer shall be capable of carrying 100 % of the nameplate rating in a 20 ˚C average, not to exceed 40 ˚C maximum ambient in any 24 hour period. The high voltage and low voltage windings shall be constructed using (copper, aluminum) conductors. The high voltage windings shall be vacuum cast in epoxy in a metal mold utilizing a proven casting process that ensures the absence of voids. The vacuum cast coils shall use a mineral filled casting epoxy which has been proven to provide acceptable thermal and mechanical performance. The mineral filler shall enhance the pure epoxy to increase its thermal conductivity, mechanical strength, arc resistance, and adhesion to the conductor; plus change its coefficient of expansion to be closer to that of the conductor material. The vacuum cast coils shall also be reinforced with fiberglass mat. The transformer shall be constructed of individually cast primary coils, coaxially mounted over the low voltage coils. The low voltage coils shall be blocked radially to the core to ensure short circuit integrity. The finished primary and secondary coil must be hermetically sealed in epoxy utilizing a proven manufacturing system that demonstrates its ability to minimize hot spots and partial discharge. An induced partial discharge test shall be performed on each winding.
A phase-to-phase pre-stress voltage of 180 % rated voltage shall be induced for 30 seconds, followed without interruption by a phasephase voltage of 130 % rated voltage for 3 minutes, during which the partial discharge shall be measured. The maximum level of partial discharges should be 10 pc. In addition, the manufacturer must have complete in-house capability to perform all by the standards required production tests and the following optional tests when required: temperature rise, sound level, and full wave impulse. The transformer core shall be constructed of high-grade nonaging silicon steel laminations with magnetic permeability and low hysteresis and eddy current losses. Magnetic flux densities are to be kept below the saturation point. A continuous winding process shall be used to minimize losses, exciting currents and sound levels. The finished core and clamping structure shall be coated to protect against corrosion. Primary and secondary coordination bus assemblies, as required for connection to associated switchgear are to be of bolted construction. The impulse rating of the transformer must equal or exceed the basic impulse level specified by the standard for the applicable voltage class. The basic impulse level shall be inherent to the winding design and is to be obtained without the use of supplemental surge arresters. Forced air cooling, when required, shall increase the continuous self cooled rating of the transformer by 33 1/3 %. The FA increase shall be possible with forced cooling without exceeding the specified maximum temperature rise. The forced air cooling shall be regulated automatically by sensors placed in the low voltage winding‘s air ducts. Forced air cooling shall include: threephase electronic digital temperature monitor, fans, control wiring, control panel with test switch, indicator lights, alarm and alarm silencing switch. After completion, each transformer shall undergo routine tests per IEC60076-11-2004. The tests shall be accomplished using calibrated test equipment which has recorded accuracy traceable to National Institute of Standards. Technologies (IEC60076-11-2004). Certification of Calibration shall be provided with test reports, if requested.
ABB Ltd. Affolternstrasse 44 P.O. Box 8131 8050 Zurich, Switzerland www.abb.com/transformers
Note: We reserve the right to make technical changes or modify the contents of this document without prior notice. With regard to purchase orders, the agreed particulars shall prevail. ABB AG does not accept any responsibility whatsoever for potential errors or possible lack of information in this document. We reserve all rights in this document and in the subject matter and illustrations contained therein. Any reproduction, disclosure to third parties or utilization of its contents - in whole or in parts - is forbidden without prior written consent of ABB AG. Copyright© 2011 ABB All rights reserved
1LES100011-ZD en printed in Germany (03.11-2-GD)
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