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K-Factor Transformers

K-Factor transformers are designed to reduce the heating effects of harmonic currents. 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. Hevi-Duty K-Factor transformers have UL ratings of K-4, K-13 and K-20.

The Hevi-Duty 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 flox 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)
  • Weather Shields (UL-3R)
  • Stainless Steel Enclosures
  • Totally enclosed non-ventilated designs
  • Open core and coil designs
  • Copper Wound designs

PDF Files

K-Factor Transformers Specifications
Operations & Maintenance Recommendations

 

Three Phase

Group A: K-4 Rated 480 Primary, 208/120 Secondary, 60 Hz

Catalog Number kVA NEMA 3R Weather Shield* Pri. Amps Sec. Amps
3H4T2H15S 15 WS-02 18.1 41.7
3H4T2H30S 30 WS-14 36.1 83.4
3H4T2H45S 45 WS-14 54.2 125
3H4T2H75S 75 WS-30 90.3 208
3H4T2H112S 112.5 WS-10 135 313
3H4T2H150S 150 WS-10 181 417
3H4T2H225S 225 WS-11 271 625
3H4T2H300S 300 WS-11 361 834
3H4T2H500S 500 WS-12 602 1390

*Weather shields come in a set of two and need to be ordered separately.

 

Group B: K-13 Rated 480 Primary, 208/120 Secondary, 60 Hz

Catalog Number kVA NEMA 3R Weather Shield* Pri. Amps Sec. Amps
3H13T2H15S 15 WS-14 18.1 41.7
3H13T2H30S 30 WS-30 36.1 83.4
3H13T2H45S 45 WS-30 54.2 125
3H13T2H75S 75 WS-30 90.3 208
3H13T2H112S 112.5 WS-10 135 313
3H13T2H150S 150 WS-11 181 417
3H13T2H225S 225 WS-11 271 625
3H13T2H300S 300 WS-12 361 834

*Weather shields come in a set of two and need to be ordered separately.

 

Group C: K-20 Rated 480 Primary, 208/120 Secondary, 60 Hz

Catalog Number kVA NEMA 3R Weather Shield* Pri. Amps Sec. Amps
3H20T2H15S 15 WS-14 18.1 41.7
3H20T2H30S 30 WS-30 36.1 83.4
3H20T2H45S 45 WS-30 54.2 125
3H20T2H75S 75 WS-30 90.3 208
3H20T2H112S 112.5 WS-10 135 313
3H20T2H150S 150 WS-11 181 417
3H20T2H225S 225 WS-11 271 625
3H20T2H300S 300 WS-12 361 834

*Weather shields come in a set of two and need to be ordered separately.

 

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