Ventilated Distribution Transformers
K-Factor Transformers
K-Factor transformers are designed to reduce the heating
effects of harmonic currents created by loads like those
shown in Chart A. The K-Factor rating is an index of the
transformer’s ability to withstand harmonic content while
operating within the temperature limits of its insulating system.
SolaHD K-Factor transformers have UL ratings of K-4, K-13,
and K-20.
The SolaHD K-Factor design is a specialized transformer that
offers these benefits:
• Conductors capable of carrying the harmonic currents
of non-linear loads without exceeding the temperature
rating of the insulation system.
• A transformer design that takes into account the
increase in naturally occurring “stray” losses caused
by non-linear loads. These losses cause standard
transformers to dramatically overheat and substantially
shorten design life.
• A core and coil design that manages the DC flux caused
by triplen harmonics. As these harmonics increase, they
cause additional current to circulate in the delta winding.
This produces a DC flux in the core which leads to core
saturation, voltage instability and overheating.
Features
• Conductors to carry harmonics of a K-rated load
without exceeding insulation temperature ratings
• UL 1561 Listed up to K-20 rated protection
• Rated temperature rise of 150°C, 220°C insulation
• Shielded for quality power
• Basic design takes “stray losses” into account and
functions within safe operating temperatures
• Core and coil design engineered to manage the zero
sequence flux caused by triplen harmonics
• Provides 100% rated current without overheating the
windings or saturating the core
Accessories and Optional Design Styles
• Wall mounting brackets (500 lbs maximum) (Item WB1C)
• Weather Shields (UL Listed/NEMA Type 3R)
• Totally enclosed non-ventilated designs (TENV) (Non UL) *
• Low temperature rise units available
• Open core and coil designs (UL Recognized)
• Copper Wound designs
• Alternate voltages
• Compliant to NEMA TP-1 Standards
* Not all optional designs are UL Listed. Contact Technical Services.
5
E25872
Certifications and Compliances
•
Listed: E25872
- UL 1561
Chart A: Typical Load K-Factors
Load
K-Factor
Electric discharge lighting .............................................................. K-4
UPS with optional input filter
.......................................................... K-4
Welders ......................................................................................... K-4
Induction heating equipment ......................................................... K-4
PLCs and solid state controls ........................................................ K-4
Telecommunications equipment (e.g.. PBX)
................................. K-13
UPS without input filtering
............................................................ K-13
Multiwire receptacle circuits in general care areas of
health care facilities and classrooms of schools, etc. ................... K-13
Multi-wire receptacle circuits supplying inspection or
testing equipment on an assembly or production line................... K-13
Mainframe computer loads .......................................................... K-20
Solid state motor drives (variable speed drives) ............................ K-20
REPRINTED WITH PERMISSION FROM
EDI MAGAZINE
Contact
Technical Services
at
(800) 377-4384
with any questions.
Visit our website at www.solahd.com.
209
5
Selection Tables: Three Phase
kVA
15
30
45
75
112.5
150
225
300
500
Catalog
Number
3H4T2H15S
3H4T2H30S
3H4T2H45S
3H4T2H75S
3H4T2H112S
3H4T2H150S
3H4T2H225S
3H4T2H300S
3H4T2H500S
Ventilated Distribution Transformers
Group A: K-4 Rated 480
Δ
Primary, 208Y/120 Secondary, 60 Hz
Type 3R
Weather Shield
1
WS-02
WS-14
WS-14
WS-30
WS-30
WS-10
WS-11
WS-11
WS-12
Height
in (mm)
Width
in (mm)
Depth
in (mm)
Approx. Ship
Weight lbs (kg)
187.0 (84.82)
Design
Style
2
1
1
1
1
1
1
1
1
1
Elec
Conn
2
5
5
5
5
5
5
5
5
5
Primary
Amps
18.1
36.1
54.2
90.3
135.0
181.0
271.0
361.0
602.0
Secondary
Amps
41.7
83.4
125.0
208.0
313.0
417.0
625.0
834.0
1390.0
23.00 (584.2) 18.00 (457.2) 14.00 (355.6)
28.00 (711.2) 23.00 (584.2) 16.00 (406.4) 292.0 (132.45)
28.00 (711.2) 23.00 (584.2) 16.00 (406.4) 376.0 (170.55)
34.00 (863.6) 28.00 (711.2) 22.00 (558.8) 569.0 (258.09)
34.00 (863.6) 28.00 (711.2) 22.00 (558.8) 768.0 (348.36)
44.00 (1117.6) 33.00 (838.2) 21.00 (533.4) 933.0 (423.20)
46.00 (1168.4) 36.00 (914.4) 24.00 (609.6) 1342.0 (608.72)
46.00 (1168.4) 36.00 (914.4) 24.00 (609.6) 1525.0 (691.73)
65.00 (1651.0) 45.00 (1143.0) 35.00 (889.0) 2460.0 (1115.84)
Group B: K-13 Rated 480
Δ
Primary, 208Y/120 Secondary, 60 Hz
kVA
15
30
45
75
112.5
150
225
300
Catalog
Number
3H13T2H15S
3H13T2H30S
3H13T2H45S
3H13T2H75S
3H13T2H112S
3H13T2H150S
3H13T2H225S
3H13T2H300S
Type 3R
Weather Shield
1
WS-14
WS-14
WS-30
WS-30
WS-10
WS-11
WS-11
WS-12
Height
in (mm)
Width
in (mm)
Depth
in (mm)
Approx. Ship
Weight lbs (kg)
305.0 (138.35)
405.0 (183.70)
590.0 (267.62)
805.0 (365.14)
972.0 (440.89)
Design
Style
2
1
1
1
1
1
1
1
1
Elec
Conn
2
5
5
5
5
5
5
5
5
Primary
Amps
18.1
36.1
54.2
90.3
135.0
181.0
271.0
361.0
Secondary
Amps
41.7
83.4
125.0
208.0
313.0
417.0
625.0
834.0
28.00 (711.2) 23.00 (584.2) 16.00 (406.4)
28.00 (711.2) 23.00 (584.2) 16.00 (406.4)
34.00 (863.6) 28.00 (711.2) 22.00 (558.8)
34.00 (863.6) 28.00 (711.2) 22.00 (558.8)
44.00 (1117.6) 33.00 (838.2) 21.00 (533.4)
46.00 (1168.4) 36.00 (914.4) 24.00 (609.6) 1325.0 (601.01)
46.00 (1168.4) 36.00 (914.4) 24.00 (609.6) 1515.0 (687.19)
65.00 (1651.0) 45.00 (1143.0) 35.00 (889.0) 2460.0 (1115.84)
Group C: K-20 Rated 480
Δ
Primary, 208Y/120 Secondary, 60 Hz
kVA
15
30
45
75
112.5
150
225
300
Catalog
Number
3H20T2H15S
3H20T2H30S
3H20T2H45S
3H20T2H75S
3H20T2H112S
3H20T2H150S
3H20T2H225S
3H20T2H300S
Type 3R
Weather Shield
1
WS-14
WS-14
WS-30
WS-30
WS-10
WS-11
WS-11
WS-12
Height
in (mm)
28.00 (711.2)
28.00 (711.2)
34.00 (863.6)
34.00 (863.6)
Width
in (mm)
23.00 (584.2)
23.00 (584.2)
28.00 (711.2)
28.00 (711.2)
Depth
in (mm)
16.00 (406.4)
16.00 (406.4)
22.00 (558.8)
22.00 (558.8)
21.00 (533.4)
24.00 (609.6)
24.00 (609.6)
Approx. Ship
Weight lbs (kg)
305.0 (138.35)
405.0 (183.70)
590.0 (267.62)
805.0 (365.14)
972.0 (440.89)
1325.0 (601.01)
1515.0 (687.19)
Design
Style
2
1
1
1
1
1
1
1
1
Elec
Conn
2
5
5
5
5
5
5
5
5
Primary
Amps
18.1
36.1
54.2
90.3
135.0
181.0
271.0
361.0
Secondary
Amps
41.7
83.4
125.0
208.0
313.0
417.0
625.0
834.0
44.00 (1117.6) 33.00 (838.2)
46.00 (1168.4) 36.00 (914.4)
46.00 (1168.4) 36.00 (914.4)
65.00 (1651.0) 45.00 (1143.0) 35.00 (889.0) 2460.0 (1115.84)
Notes:
1. Weather shields (set of two) must be ordered separately.
2. Design Styles and Electrical Connections can be found
at the end of the Ventilated Distribution Transformers section.
210
Contact
Technical Services
at
(800) 377-4384
with any questions.
Visit our website at www.solahd.com.
5
240 x 480 Volt Primary,
120/240 Volt Secondary
Taps: 2, 2½% FCAN; 4, 2½% FCBN
H1
7
5
3
1
2
4
6
8
Ventilated Distribution Transformers
Electrical Connections (Single Phase)
1
H2
120/208/240/277 Volt Primary,
120/240 Volt Secondary
Taps: None
H1
5
3
1
2
4
6
H2
2
SHIELD
SHIELD
X1
X3
X2
X4
X1
X3
X2
X4
Primary Voltage
504
492
480
468
456
444
432
252
240
228
216
Interconnect
1 to 2
2 to 3
3 to 4
4 to 5
5 to 6
6 to 7
7 to 8
H1 to 2 H2 to 1
H1 to 4 H2 to 3
H1 to 6 H2 to 5
H1 to 8 H2 to 7
Connect
Lines To
H1 & H2
H1 & H2
H1 & H2
H1 & H2
H1 & H2
H1 & H2
H1 & H2
H1 & H2
H1 & H2
H1 & H2
H1 & H2
Primary Voltage
277
240
208
120
Interconnect
1 to 2
3 to 4
5 to 6
H1 to 4
H2 to 3
Connect
Lines To
H1 & H2
H1 & H2
H1 & H2
H1 & H2
Secondary
Voltage
240
120-0-120
120
Interconnect
X2 to X3
X2 to X3
X2 to
X1 to X3
X2 to X4
Connect
Lines To
X1 & X4
X1-X2-X4
X1 & X4
ES12 Series
Secondary
Voltage
240
120-0-120
120
Interconnect
X2 to X3
X2 to X3 X2 to
X1 to X3 X2 to X4
Connect
Lines To
X1 & X4
X1-X2-X4
X1 & X4
Electrical Connections (Three Phase)
480
Δ
Volt Primary,
208Y/120 Volt Secondary
Taps: 2, 2½% FCAN; 4, 2½% FCBN
H1
7654321
ES5 Series
5
480
Δ
Volt Primary,
240
Δ
W/120 CT Volt Secondary
Taps: 2, 2½% FCAN; 4, 2½% FCBN
H1
7654321
6
H2
7654321
H3
7654321
H2
7654321
H3
7654321
X0
X1
X2
SHIELD
X3
*
X6
X1
H2
X2
X2
SHIELD
*
X3
H2
X1
H1
H3
X2
X0
X3
H1
H3
X1
X6
X3
Primary H1-H2-H3
@ Tap
1
2
3
4
5
6
7
Voltage
504
492
480
468
456
444
432
Secondary Voltage
X1, X2, X3
X0- X1, X2, X3
Primary H1-H2-H3
@ Tap
1
2
3
Voltage
504
492
480
468
456
444
432
Secondary Voltage
X1, X2, X3
X6-X1, X6-X3
208
120
4
5
6
7
240
120
ET2 and 3H Series
* Shield available in electrostatically shielded units only.
ET5 Series
* Shield available in electrostatically shielded units only.
212
Contact
Technical Services
at
(800) 377-4384
with any questions.
Visit our website at www.solahd.com.
Ventilated Distribution Transformers
Electrical Connections (Three Phase) cont.
480
Δ
Volt Primary
380/220 Volt Secondary
Taps: 2, 2½% FCAN; 4, 2½% FCBN
H1
7654321
5
9
7
480
Δ
Volt Primary
480Y/277 Volt Secondary
Taps: 2, 2½% FCAN; 4, 2½% FCBN
H1
7654321
8
208
Δ
Volt Primary
208Y/120 Volt Secondary
Taps: 2, 2½% FCAN; 4, 2½% FCBN
H1
7654321
H2
7654321
H3
7654321
H2
7654321
H3
7654321
H2
7654321
H3
7654321
X0
X1
H2
X2
X2
X1
X0
X3
SHIELD
X3
X0
X1
H2
X2
X2
X1
X0
X3
SHIELD
X3
X0
X1
H2
X2
X2
X1
X0
X3
SHIELD
X3
H1
H3
H1
H3
H1
H3
Primary H1-H2-H3
@ Tap
1
2
3
4
5
6
7
Secondary Voltage
X1, X2, X3
X0- X1, X2, X3
Primary H1-H2-H3
@ Tap
1
2
3
Voltage
504
492
480
468
456
444
432
Secondary Voltage
X1, X2, X3
X0- X1, X2, X3
Primary H1-H2-H3
@ Tap
1
2
3
Voltage
218
213
208
203
198
192
187
Secondary Voltage
X1, X2, X3
X0- X1, X2, X3
Voltage
504
492
480
468
456
444
432
380
220
4
5
6
7
480
277
4
5
6
7
208
120
ET79 Series
ET81 Series
ET3 Series
208
Δ
Volt Primary
480Y/277 Volt Secondary
Taps: 2, 2½% FCAN; 4, 2½% FCBN
X1
7654321
10
240
Δ
Volt Primary
208Y/120 Volt Secondary
Taps: 2, 2½% FCAN; 4, 2½% FCBN
H1
7654321
11
240
Δ
Volt Primary
480Y/277 Volt Secondary
Taps: 2, 2½% FCAN; 4, 2½% FCBN
X1
7654321
12
X3
X2
7654321
X3
7654321
H2
7654321
H3
7654321
X2
7654321
7654321
H0
H1
X2
H2
H2
H1
H0
H3
SHIELD
H3
X0
X1
H2
X2
X2
X1
X0
X3
SHIELD
X3
H0
H1
H2
SHIELD
H3
X2
H1
X1
Primary X1-X2-X3
@ Tap
1
2
3
H2
H0
H3
Secondary Voltage
H1, H2, H3
H0- H1, H2, H3
X1
X3
H1
H3
X3
Primary X1-X2-X3
@ Tap
1
2
3
4
5
6
7
Voltage
218
213
208
203
198
192
187
Secondary Voltage
H1-H2-H3
H0-H1, H2, H3
Primary H1-H2-H3
@ Tap
1
2
3
Voltage
252
246
240
234
228
222
216
Secondary Voltage
X1, X2, X3
X0- X1, X2, X3
Voltage
252
246
240
234
228
222
216
480
277
4
5
6
7
208
120
4
5
6
7
480
277
ET84 Series
ET6 Series
ET85 Series
Contact
Technical Services
at
(800) 377-4384
with any questions.
Visit our website at www.solahd.com.
213
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