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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 (below). 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.
On this page: Features, Accessories and Optional Design Styles, Typical Load K-Factors, Selection Tables
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- 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 flox caused
by triplen harmonics
- Provides
100% rated current without overheating the windings
or saturating the core
- Wall mounting brackets (500 lbs maximum) (Item WB1C)
- Weather Shields (UL-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
- Complaint to NEMA TP-1 Standards
*Not all optional designs are UL Listed. Contact Technical Service.
| Load |
K-Factor |
| Electric discharge lighting |
K-4 |
| UPS with optional input filtering |
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 |
Multiwire 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 |
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*Reprinted with permission from
EDI Magazine
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| Group A: K-4 Rated 480 ∆ Primary, 208/120 Secondary, 60 Hz |
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|
kVA |
Catalog
Number
|
NEMA 3R
Weather Shield* |
Height
(inch) |
Width
(inch) |
Depth
(inch) |
Ship Weight
Approx. (lbs) |
Design
Style** |
Elec
Conn |
Prim.
Amps |
Sec.
Amps |
| 15 |
3H4T2H15S |
WS-02 |
23 |
18 |
14 |
187 |
1 |
5 |
18.1 |
41.7 |
| 30 |
3H4T2H30S |
WS-14 |
28 |
23 |
16 |
292 |
1 |
5 |
36.1 |
83.4 |
| 45 |
3H4T2H45S |
WS-14 |
28 |
23 |
16 |
376 |
1 |
5 |
54.2 |
125 |
| 75 |
3H4T2H75S |
WS-30 |
34 |
28 |
22 |
569 |
1 |
5 |
90.3 |
208 |
| 112.5 |
3H4T2H112S |
WS-10 |
44 |
33 |
21 |
768 |
1 |
5 |
135 |
313 |
| 150 |
3H4T2H150S |
WS-10 |
44 |
33 |
21 |
933 |
1 |
5 |
181 |
417 |
| 225 |
3H4T2H225S |
WS-11 |
46 |
36 |
24 |
1342 |
1 |
5 |
271 |
625 |
| 300 |
3H4T2H300S |
WS-11 |
46 |
36 |
24 |
1525 |
1 |
5 |
361 |
834 |
| 500 |
3H4T2H500S |
WS-12 |
65 |
45 |
35 |
2460 |
1 |
5 |
602 |
1390 |
*Weather shields come in a set of two and need to be ordered separately.
**Design Style and Electrical Connections can be found by clicking the link or by selecting the pdf files to the left. |
| Group B: K-13 Rated 480 ∆ Primary, 208/120 Secondary, 60 Hz |
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|
|
kVA |
Catalog
Number
|
NEMA 3R
Weather Shield* |
Height
(inch) |
Width
(inch) |
Depth
(inch) |
Ship Weight
Approx. (lbs) |
Design
Style** |
Elec
Conn |
Prim.
Amps |
Sec.
Amps |
| 15 |
3H13T2H15S |
WS-14 |
28 |
23 |
16 |
305 |
1 |
5 |
18.1 |
41.7 |
| 30 |
3H13T2H30S |
WS-30 |
34 |
28 |
22 |
405 |
1 |
5 |
36.1 |
83.4 |
| 45 |
3H13T2H45S |
WS-30 |
34 |
28 |
22 |
590 |
1 |
5 |
54.2 |
125 |
| 75 |
3H13T2H75S |
WS-30 |
34 |
28 |
22 |
805 |
1 |
5 |
90.3 |
208 |
| 112.5 |
3H13T2H112S |
WS-10 |
44 |
33 |
21 |
972 |
1 |
5 |
135 |
313 |
| 150 |
3H13T2H150S |
WS-11 |
46 |
36 |
24 |
1325 |
1 |
5 |
181 |
417 |
| 225 |
3H13T2H225S |
WS-11 |
46 |
36 |
24 |
1515 |
1 |
5 |
271 |
625 |
| 300 |
3H13T2H300S |
WS-12 |
65 |
46 |
35 |
2460 |
1 |
5 |
361 |
834 |
*Weather shields come in a set of two and need to be ordered separately.
**Design Style and Electrical Connections can be found by clicking the link or by selecting the pdf files to the left. |
| Group C: K-20 Rated 480 ∆ Primary, 208/120 Secondary, 60 Hz |
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|
|
|
kVA |
Catalog
Number
|
NEMA 3R
Weather Shield* |
Height
(inch) |
Width
(inch) |
Depth
(inch) |
Ship Weight
Approx. (lbs) |
Design
Style** |
Elec
Conn |
Prim.
Amps |
Sec.
Amps |
| 15 |
3H20T2H15S |
WS-14 |
28 |
23 |
16 |
305 |
1 |
5 |
18.1 |
41.7 |
| 30 |
3H20T2H30S |
WS-30 |
34 |
28 |
22 |
405 |
1 |
5 |
36.1 |
83.4 |
| 45 |
3H20T2H45S |
WS-30 |
34 |
28 |
22 |
590 |
1 |
5 |
54.2 |
125 |
| 75 |
3H20T2H75S |
WS-30 |
34 |
28 |
22 |
805 |
1 |
5 |
90.3 |
208 |
| 112.5 |
3H20T2H112S |
WS-10 |
44 |
33 |
21 |
972 |
1 |
5 |
135 |
313 |
| 150 |
3H20T2H150S |
WS-11 |
46 |
36 |
24 |
1325 |
1 |
5 |
181 |
417 |
| 225 |
3H20T2H225S |
WS-11 |
46 |
36 |
24 |
1515 |
1 |
5 |
271 |
625 |
| 300 |
3H20T2H300S |
WS-12 |
65 |
45 |
35 |
2460 |
1 |
5 |
361 |
834 |
*Weather shields come in a set of two and need to be ordered separately.
**Design Style and Electrical Connections can be found on page |
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