ENCAPSULATED TRANSFORMER

A large industrial electrical transformer with three red cylindrical coils, black and metallic structural components, and various colored wiring and connectors.

Encapsulated (Potted) Transformers (also referred to as Epoxy Resin Encapsulated) are designed for applications where the environmental conditions would not permit a general purpose ventilated dry type transformer. The entire transformer core & coil is encased in a silica sand / polyurethane mixture which protects the windings from any airborne contaminants and moisture. 

Typical areas of use include:

  • Corrosive Environments: Petro-Chemical, steel, pulp and paper industries

  • Damp conditions: Mines, pump-houses underground or rooftop service areas

  • Industrial applications: processes with high degree of airborne dust or conductive particles

Industry Standards:

  • CSA certified

  • UL listed

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Product Specification

Specification

Q.T.S Standard

Available Options

Capacity

Voltage Class

Conductor

Up to 5 kV available

Cooling

Insulation System

C - Copper or A - Aluminum

Frequency

Self cooled (ANN)

N/A

60 Hz

50/60 Hz

Class 200 (200 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

Encapsulated in silica sand and polyester resin

Single Phase: 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 5, 7.5, 10, 15, 25, 37.5, 50, 75, 100

Three Phase: 1, 2, 3, 6, 9, 15, 30, 45, 75,

112.5. 150

Taps

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

Other primary or secondary tap available

Lugs or pads

N/A

NRCan 2019

Impedance

Encapsulated transformers normally have a lower impedance value than ventilated transformers (approximately 1 - 2%)

Enclosure Type

Seismic

1.2 kV (CSA), 600 V (UL)

Sound Level

NEMA Type 3R outdoor

Type 4, non-ventilated

Shipping

Lead Time

3 to 6 Weeks Typical

Expedited available

Per CSA C9 and NEMA ST-20

N/A

Available K4, K9, K13, K20

N/A

Higher levels available

3 dB below CSA level

No approval (not tested as with ventilated transformers), however due to their fully encapsulated construction, they are well suited for environments where vibration may be present.

Specific seismic requirement available

Bolted to skid, with nylon cover

Specific Cu-Al lugs available.

Special impedance available

Shrink wrap, special skid, export crating