K Factor Transformer
The K FACTOR TRANSFORMER is an isolating transformer that can be loaded at 100% of load plus the harmonics load without overheating. The losses generated by the harmonics can be calculated by multiplying the K factor by the stray losses. The K FACTOR is derived from a mathematical formula, which states that the eddy current losses in a transformer will be increased in direct proportion to the sum of the percentage current at a given harmonic level multiplied by the square of the harmonic order.
Advantages
 Prevent the overheating of the transformer by increasing the stray losses with a K factor.
 Prevent neutral overheating by over sizing it at 200%.
 More efficient.
Options
 Electrostatic shields.
 Aluminium winding.
 80^{o}C and 115^{o}C temperature rise.
 k Factor (K4, K13, K20 and K30).
 Nema 3R and Nema 4.
 50 Hz.
Characteristics
 Reduction of skin effects by using multiple conductors of thinner dimensions.
 Copper winding.
 Taps 23% FCAN, 23% FCBN.
 DeltaWye connection standart or DeltaZigZag.
 150^{o}C temperature rise.
 Insulation class 220^{o}C.
 Enclosure type Nema 2, 3R and 4.
 Proper axial height of the winding. (Less than 15% between the primary and secondary winding).
 Low flux density in high grain oriented steels.
 Oversize neutral (200%) conductor.
Application
The K FACTOR TRANSFORMER is used for nonlinear loads. With the arrival of computers, faxes, printers and variable speed drives within the modern day business centers and industry we encounter harmonic problems. These loads are very nonlinear and cause a nonsinusoidal waveform rich in harmonics.
The harmonics of most concern are the 3rd, 5th and 7th, causing serious problems with electrical office equipment and with power distribution systems.
These harmonics cause the following conditions:
 Overheating of the transformer : these harmonics increase the stray losses by a factor, better known as “K factor”, and these additional losses increase the temperature of the unit.
 High current in the neutral wire of the secondary transformer due to the presence of tripling harmonics as the 3rd , 6th and 9th . In the worst situation this current can be as high as 200% of the nominal current.
 Blowing of breakers or fuses at or below recommended current.
Technical Drawing
K Factor : 3 Phase
K4 Factor 
K13 Factor 

KVA  Cooper (BC)  Cooper (BC) 
15  BC3015VK4  BC3015VK13 
30  BC3030VK4  BC3030VK13 
45  BC3045VK4  BC3045VK13 
75  BC3075VK4  BC3075VK13 
112.5  BC3112VK4  BC3112VK13 
150  BC3150VK4  BC3150VK13 
225  BC3225VK4  BC3225VK13 
300  BC3300VK4  BC3300VK13 