General Purpose Isolation transformers are used to lower distribution voltages (480 or 600V) to lower voltages (typically 120/240 or 208Y/120) for power distribution within commercial or industrial buildings. These “two windings” transformers provide the electrical isolation required, and allow for short runs of high current, low voltage cables, reducing losses in the system, and reducing costs.
General Purpose Isolation transformer are suitable for supplying the following type of loads:
General industrial & commercial buildings
Lighting & electrical
HVAC
Industry Standards:
CSA certified
UL listed
GENERAL PURPOSE ISOLATION TRANSFORMER
Product Specification
Specification
Standard
Available Options
3 to 333kVA Single Phase and 5 to 1,000kVA Three Phase
Capacity
N/A
Voltage Class
1.2 kV (CSA), 600 V (UL)
N/A
Copper or Aluminum
Conductor
N/A
Cooling
Self cooled (ANN)
ANC (Non ventilated units)
Frequency
60 Hz
50/60 Hz
Class 220 (220 ⁰C at hottest spot, 150 ⁰C average rise)
Insulation System
N/A
Temperature Rise
150 ⁰C average rise
115 ⁰C, 80 ⁰C
K Factor Rating
No K-Factor
Available K4, K9, K13, K20
Impregnation
Epoxy dipped and Baked
Other custom specifications available
Polyester Resin Dipped and Baked
Efficiency level
NRCan 2019 / DOE 2016
Higher levels available
Taps
Typically +/-2 x 2.5%, +/-1 x 5%
Other primary or secondary tap available
Terminations
Lugs or pads
Specific Cu-Al lugs available.
Impedance
Per CSA C9
Special impedance available
Enclosure Type
NEMA Type 1 or 3R indoor
Type 1, 2, 3R, 4, 4X or 12 Enclosure
Sound Level
Per CSA C9 and NEMA ST-20
3 dB below CSA level
Seismic
Canada Zone 6, USA Zone 4
Specific seismic requirement available