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Dry-type Transformers

Energy Efficiency Regulations

Technical Requirements for Energy-Using Products

Dry-Type Transformers

Energy Efficiency Standard

Single-Phase (January 1, 2005)
    (Minimum Efficiency Values) High-voltage Winding
Rating,
kVA
Minimum
Low Voltage,
V
1.2 kV Class
Efficiency, %,
at 0.35 per Unit Nameplate Load
BIL 20-150 kV
Efficiency, %,
at 0.50 per Unit Nameplate Load
15 120/240 97.70 97.60
25 120/240 98.00 97.90
37.5 120/240 98.20 98.10
50 120/240 98.30 98.20
75 120/240 98.50 98.40
100 120/240 98.60 98.50
167 120/240 98.70 98.70
250 120/240 98.80 98.80
333 120/240 98.90 98.90
500 480 - 99.00
667 480 - 99.00
833 480 - 99.10
Three-Phase (January 1, 2005)
15 208Y/120 97.00 96.80
30 208Y/120 97.50 97.30
45 208Y/120 97.70 97.60
75 208Y/120 98.00 97.90
112.5 208Y/120 98.20 98.10
150 208Y/120 98.30 98.20
225 208Y/120 98.50 98.40
300 208Y/120 98.60 98.50
500 208Y/120 98.70 98.70
750 208Y/120 98.80 98.80
1000 208Y/120 98.90 98.90
1500 480Y/277 - 99.00
2000 480Y/277 - 99.00
2500 480Y/277 - 99.10
3000 600Y/347 - 99.10
3750 4160Y/2400 - 99.20
5000 4160Y/2400 - 99.20
7500 4160Y/2400 - 99.20

Notes:

  1. Minimum values of low-voltage windings for both single-phase and three-phase transformers are intended to limit the current.
  2. Low-voltage winding shall not have a BIL rating greater than 30 kVA.
  3. Efficiency values shall apply for the fundamental 60 Hz frequency only
  4. Reference winding temperature 75oC.

Requirements for the Energy Efficiency Report, as Listed in Schedule IV of the Regulations

  • type of product (dry-type transformer);
  • brand name;
  • model number;
  • manufacturer;
  • name of the organization or province that carried out the transformer verification and authorized the verification mark that will be affixed to the transformer;
  • kVA rating;
  • single- or three-phase;
  • low-voltage winding in volts;
  • high-voltage winding rating of
     (i) 1.2kV Class, or
     (ii) BIL 20-150 kV;
  • whether it is a three-phase with high-voltage windings and a voltage ratio that, between the highest and lowest of their rated voltages, is other than 2:1;
  • tested efficiency in percent;
  • the loss, in watts, when under load (load loss);
  • the loss, in watts, when not under load (no-load loss).

APPLIES TO
A transformer, including a transformer that is incorporated into any other product, in which the core and windings are in a gaseous or dry compound insulating medium and that

(a) is either single-phase with nominal power from 15 to 833 kVA or three-phase with a nominal power from 15 to 7500 kVA,

(b) has a nominal frequency of 60 Hz, and

(c) has a primary voltage of 35 kV or less

but does not include,

  • an autotransformer,
  • a drive (isolation) transformer, with two or more output windings or a nominal low-voltage line current greater than 1,500 A,
  • an instrument transformer,
  • a rectifier transformer,
  • a sealed transformer,
  • a non-ventilated transformer,
  • a testing transformer,
  • a furnace transformer,
  • a welding transformer,
  • an encapsulated transformer, or
  • a transformer with a nominal low-voltage line current of 4,000 A or more.

TEST STANDARD
CAN/CSA C802.2-00

COMPLIANCE DATE
January 1, 2005

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