AUTOTRANSFORMER

A metallic electrical enclosure box with mounting brackets.

Autotransformers are transformers which have a single winding per phase, part of which is common to both primary and secondary circuits. Using an Autotransformer is an economical and compact means of connecting electrical equipment to a power supply or a different voltage. Part of the winding is common to both primary and secondary circuits so there is no isolation between the two. This may be acceptable on some power systems that do not have a grounded neutral on the secondary side of the main power transformer. Designed for installation where a reliable power source is required for lighting and other low voltage equipment and machinery. Indoor and outdoor installation is possible depending on the enclosure.

Autotransformer are suitable for supplying the following type of loads:

  • Motor loads of industrial machinery

  • Electric heating

  • Air conditioners

Industry Standards:

  • CSA certified

  • UL listed

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Product Specification

Specification

Q.T.S Standard

Available Options

Capacity

Voltage Class

Conductor

N/A

Cooling

Insulation System

C - Copper or A - Aluminum

Frequency

Self cooled (ANN)

ANC (Non ventilated units)

60 Hz

50/60 Hz

Class 220 (220 ⁰C at hottest spot, 150 ⁰C average rise)

No K-Factor

Temperature Rise

K Factor Rating

150 ⁰C average rise

115 ⁰C, 80 ⁰C

N/A

Impregnation

Efficiency level

Terminations

Polyester Resin Dipped and Baked

3 to 333kVA Single Phase and 5 to 750kVA Three Phase

Taps

Typically +/-2 x 2.5%, +/-1 x 5%

Other primary or secondary tap available

Lugs or pads

No applicable efficiency compliance required

Larger kVA’s are classified as power transformers.

Impedance

Per CSA C9

Enclosure Type

Seismic

1.2 kV (CSA), 600 V (UL)

Sound Level

NEMA Type 1 or 3R indoor

Type 1, 2, 3R, 4, 4X or 12 Enclosure 

Shipping

Lead Time

3 to 6 Weeks Typical

Expedited available

Per CSA C9 and NEMA ST-20

N/A

Available K4, K9, K13, K20

Epoxy dipped and Baked

Other custom specifications available

Higher levels available

3 dB below CSA level

Canada Zone 6, USA Zone 4

Specific seismic requirement available

Bolted to skid, with nylon cover

Specific Cu-Al lugs available.

Special impedance available

Shrink wrap, special skid, export crating