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hubbell-acmeelectric.comN o n - L i n e a r L o a d I s o l a t i o n
®
T r a n s f o r m e r s
Non-linear loads generate high levels of harmonic currents. When supplying power to these loads, a special transformer design is necessary.
Typical non-linear loads include desktop computers, AC variable speed drives, HID lighting, electronic ballasts, inverters and welders. Of
these non-linear loads, the major source of harmonic currents is the switch mode power supply found in desktop computers, data processors
and other office equipment.
Acme non-linear load isolation transformers use special winding techniques to minimize eddy current losses generated by harmonic currents.
A double-sized neutral conductor handles the excessive neutral current found in non-linear load applications.
The amount of harmonics produced by a given load is represented by the term “K” factor. The larger the “K” factor, the more harmonics are
present. Linear loads have a “K” factor of 1; switch mode power supplies typically have a “K” factor as high as 20.
Acme non-linear load isolation transformers are shielded for cleaner power and carry the Acme exclusive 10-year limited warranty.
Features
Q
Available in K-factors of 4, 13 and 20. Consult factory for other K-factors.
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3R Compliant
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All new units ship with weather shields already installed Flexibility. When a weather shield is not needed, it can easily be
removed Terminal Lugs.
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Primary and secondary terminals come standard with lugs (up to 112.5kVA) for quicker, easier connections.
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150°C and 115°C temperature rise units. 80°C temperature rise consult factory.
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10-year limited warranty.
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UL Listed and CSA Certified.
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Available in 480V and 208V primary,15 through 225 kVA.
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Primary taps: (2) 2
1
/
2
% ANFC, (4) 2
1
/
2
% BNFC.
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Aluminum windings
The following guide will help you select the proper transformer when the K-factor is unknown.*
K-Factor/Type of Load
K1
Resistance heating, Incandescent lighting, Motors, Transformers, control/distribution
K4
Welders, Induction heaters, HID lighting, Fluorescent lighting, Solid state controls
K-13
Telecommunications equipment, Branch Circuits in classrooms and health care facilities
K-20
Main frame computers, Variable speed drives, Branch circuits with exclusive loads of Data
Processing equipment, Desktop computers
*
These ratings are to be used as a guide only. They may vary from one load equipment manufacturer to another.
A Spectrum Analysis is the best source.
Note:
Non-sinusoidal and non-linear are synonymous terms relating to the same transformer type.