Application

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 non-linear and cause a non-sinusoidal 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.

Characteristics

- Reduction of skin effects by using multiple conductors of thinner dimensions.
- Copper winding.
- Taps 2-3% FCAN, 2-3% FCBN.
- Delta-Wye connection standart or Delta-Zig-Zag.
- 150^oC temperature rise.
- Insulation class 220^oC.
- 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.

Options

- Electrostatic shields.
- Aluminium winding.
- 80^oC and 115^oC temperature rise.
- k Factor (K4, K13, K20 and K30).
- Nema 3R and Nema 4.
- 50 Hz.