ENCAPSULATED TRANSFORMER
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
Product Specification
Specification
Standard
Available Options
Single Phase: 3 - 125 kVA
Three Phase: 5 - 150 kVA
Capacity
N/A
Voltage Class
1.2 kV (CSA), 600 V (UL)
Up to 5 kV available
Conductor
Copper or Aluminum
N/A
Cooling
Self cooled (ANC)
N/A
Frequency
60 Hz
50/60 Hz
Class 200 (200 ⁰C at hottest spot, 130 ⁰C average rise)
Insulation System
N/A
Temperature Rise
130⁰C average rise
115 ⁰C, 80 ⁰C
K Factor Rating
No K-Factor
Available K4, K9, K13, K20
Encapsulated in silica sand and polyester resin
Impregnation
N/A
Efficiency level
N/A
N/A
Taps
Typically +/-2 x 2.5%, +/-1 x 5%
Other primary or secondary tap available
Terminations
Lugs or pads
Specific Cu-Al lugs available.
Encapsulated transformers normally have a lower impedance value than ventilated transformers (approximately 1 - 2%)
Impedance
Special impedance available
Enclosure Type
NEMA Type 3R outdoor
Type 4, non-ventilated
Sound Level
Per CSA C9 and NEMA ST-20
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.
Seismic
Specific seismic requirement available