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

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

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