ABB Inc. PDL 46-203
Distribution Transformers
Athens, GA Jefferson City, MO
Page 1
ISO 9001 Certified
January, 2002
Three Phase “T-connected”
Overhead Distribution
Transformer
The ABB “T-connected,” overhead • The same design, manufacturing and
distribution transformer can be used to performance advantages that are
serve most three phase applications up to provided on ABB single phase overhead
500 kVA. “T-connected” transformers distribution transformers are incorpo-
consist of two single-phase core/coil rated into “T-connected” design.
assemblies. This type of connection is also
referred to as a “Scott-T” connection. Features
1)Wound core with step-lap joints for
“T-connected”, overhead distribution increased efficiency and lower noise
transformers can be used to serve most levels.
three-phase applications. However, Triplex 2)Progressively wound coils with adhesive
designed three phase transformers are resins on insulating paper or conductors
needed for some applications where large for increased short-circuit strength and
motors are the load and these motors are thermal strength.
frequently started. Oil field pumping loads 3)Three point core-coil bracing for
and some irrigation pumping loads should increased mechanical strength.
use only the triplex designs. 4)CSP protection package available as an
option for increased protection against
Ratings surge currents, short circuits and
• 30-500 kVA overloads:
• 65(cid:176)C rise • Primary protective links
• 60 Hertz standard, 50 Hertz optional • Surge arresters
• High Voltages: 13800 and below • Secondary circuit breakers
• Low Voltages: 208T/120, 240T x 480T, • Secondary breaker operating handle
and 480T/277 with emergency overload reset and
• Transformer BIL Ratings overload signal light.
Transformer Primary Transformer BIL 5)Self-venting and resealing cover that
2400T 60 kV eliminates the need for an auxiliary
4160T 60 kV pressure relief device and offers
4800T 60 kV increased safety through higher tank
7200T 75 kV withstand.
8320T 75 kV 6)The paint finish process applies a
12000T 95 kV durable, corrosion resistant finish to the
12470T 95 kV product. The finish meets or exceeds
13200T 95 kV all the performance requirements of
13800T 95 kV ANSI C57.12.28. The multi-step
process includes an epoxy primer
Advantages uniformly applied by cationic electro-
• Easier, more economical and cleaner deposition and a urethane top coat.
installations are provided by three phase 7)Cover has 13 mils minimum of polyester
overhead transformers compared to coating providing 15 KV dielectric
three single-phase units. currents on “T-connected” transformers insulation of tank ground parts from live
• Lighter weight and lower cost provided are negative sequence not requiring a parts and increasing resistance to
by “T-connected” design compared to ground path. corrosion. The cover is sloped 15(cid:176)
conventional three-phase design. • Reduced installation costs, lower preventing water from collecting,
• Elimination of overloads from system operating cost, safer operation, thereby reducing the chances of
unbalance by operating “T-connected” minimized service disruptions and corrosion and leaking.
transformers without primary grounds. increased transformer life provided by 8)Tank bottom rim is three layers thick for
• Avoidance of transformer neutral optional CSP coordinated protection increased durability and resistance to
requirement since third harmonic package. shipping and handling damage.Standard Design Dimensions and Weights (All weights and dimensions are approximate.)
C C
B B
A A
D
D
HV > 5000 HV < 5000
Overall weights and dimensions are given in pounds, inches or gallons and are approximates
A = Overall Height, B = Overall Width, C = Overall Depth, D = Tank Diameter, E = Hanger Spacing
3 Phase T - T Connected
High Voltages 2400T, 4160T, 4800T
KVA A B C D E* Wgt Ship Wgt OIL Qty
30 49 26 25 17.5 11.25 685 720 35
45 49 29 28 20 23.25 990 1035 44
75 49 33 28 20 23.25 1100 1175 52
112.5 57 31 30 22 36 1530 1625 62
150 57 40 30 22 36 1770 1840 70
225 61 37 34 24 36 2215 2303 81
300 64 41 36 27 36 2750 2860 98
500 78 45 42 27 3560 3650 118
High Voltages 12000T, 12470T, 13200T, 13800T
KVA A B C D E* Wgt Ship Wgt OIL Qty
30 54 23 25 17.5 11.25 700 735 38
45 54 29 28 20 23.25 905 965 43
75 54 33 28 20 23.25 1175 1225 50
112.5 62 33 30 22 36 1505 1565 59
150 62 40 30 22 36 1725 1780 65
225 61 37 34 24 36 2285 2275 84
300 69 41 36 27 36 2915 3015 100
500 80 45 42 27 3815 3900 123
*E is the distance between the hanger brackets.
All Approximate Dimensions shown reference designs with +/- 2.5% Taps
ABB Inc.
Distribution Transformers
Athens, GA Jefferson City, MO January, 2002
ISO 9001 Certified

ABB is a well-known global leader in the electrical engineering industry, specializing in a wide range of products, including three-phase transformers. ABB's three-phase transformers are designed to meet the demanding requirements of various power distribution and transmission applications. These transformers feature advanced technology and robust construction, ensuring efficient and reliable performance for power systems. ABB's three-phase transformers typically consist of three independent windings configured to produce or receive three sinusoidal voltages with a 120-degree phase difference between each winding. They can be found in different voltage ratings, from low-voltage (LV) for local distribution to high-voltage (HV) and extra-high-voltage (EHV) for long-distance transmission lines. The design incorporates features like oil-immersed or dry type coolers, forced-air cooling, or vacuum-insulated Bushing (VIB) for enhanced insulation and environmental adaptability. ABB also offers a variety of transformer configurations such as autotransformers, instrument transformers, and harmonic filters to cater to specific customer needs. Their transformers are equipped with state-of-the-art protection systems and monitoring capabilities through digital control and automation technologies, enabling remote supervision and optimization of the transformer's operation. In summary, ABB's three-phase transformers represent a premium solution for electric utilities, industries, and other sectors requiring dependable, efficient, and advanced power system components. By combining robust engineering expertise with cutting-edge technologies, ABB ensures that their transformers contribute to a more sustainable and resilient energy infrastructure.