Dry-type Transformers

Energy Efficiency Regulations

Technical Requirements

Regulatory name

Dry-type transformer

Regulatory definition

Transformer, including one that is incorporated into any other product, in which the core and windings are in a gaseous or dry compound insulating medium and that

  • is either single phase with a nominal power of 15 to 833 kVA, or three-phase with a nominal power of 15 to 7500 kVA
  • has a nominal frequency of 60 Hz, and
  • has high voltage winding of 35 kV or less

but does not include

  • an auto transformer
  • a drive (isolation) transformers with two or more output windings or a nominal low-voltage line current greater than 1500 A
  • a grounding transformer
  • a rectifier transformer
  • a sealed transformer
  • a non-ventilated transformer
  • a testing transformer
  • a furnace transformer
  • a welding transformer
  • a special impedance transformer*
  • a transformers with a nominal low-voltage line current of 4000 A or more
  • an on-load regulating transformer, or
  • a resistance grounding transformer

Encapsulated transformers are considered a subset of non-ventilated transformers.

* Special impedance transformer means any dry-type transformer built to operate at impedance outside of the normal range for that transformer's nominal power in kVA as shown in the table of normal impedance ranges below:

Table of Dry-type Transformer Normal Impedance Ranges
Single-phase Three-phase
kVA Normal Impedance Range (%) kVA Normal Impedance Range (%)
15 1.5 - 10.0 15 1.5 - 10.0
25 1.5 - 10.0 30 1.5 - 10.0
37.5 1.5 - 10.0 45 1.5 - 10.0
50 1.5 - 10.0 75 1.5 - 10.0
100 2.0 - 10.0 150 1.5 - 10.0
167 2.5 - 10.0 225 2.5 - 10.0
250 3.5 - 10.0 300 2.5 - 10.0
333 3.5 - 10.0 500 3.5 - 10.0
500 3.5 - 11.0 750 3.5 - 11.0
667 3.5 - 11.0 1 000 3.5 - 11.0
833 3.5 - 11.0 1 500 3.5 - 11.0
2 000 3.5 - 12.0
2 500 3.5 - 12.0
3 000 4.5 - 12.0
3 750 5.0 - 13.0
5 000 5.0 - 13.0
7 500 5.0 - 13.0

Compliance date

January 1, 2010
Before January 1, 2010
(Regulated since January 1, 2005 - date of manufacture)

EnerGuide directory

List of models available

Verification mark

Required - see Introduction to Guide to the Regulations

Test standard

CAN/CSA C802.2-06 Minimum Efficiency Values for Dry-type Transformers

Energy efficiency standard

Dry-type Transformer Minimum Energy Efficiency Standards
  January 1, 2005 January 1, 2010
Percentage
efficiency at 35%
nominal load
Percentage efficiency at 50% nominal load
Single-phase kVA rating 1.2 kV Class 20-45 kV BIL > 45-95 kV BIL > 95-199 kV BIL
15 97.70 98.10 97.86 97.60
25 98.00 98.33 98.12 97.90
37.5 98.20 98.49 98.30 98.10
50 98.30 98.60 98.42 98.20
75 98.50 98.73 98.57 98.53
100 98.60 98.82 98.67 98.63
167 98.70 98.96 98.83 98.80
250 98.80 99.07 98.95 98.91
333 98.90 99.14 99.03 98.99
500 - 99.22 99.12 99.09
667 - 99.27 99.18 99.15
833 - 99.31 99.23 99.20
Three-phase kVA rating 1.2 kV Class 20-45 kV BIL > 45-95 kV BIL > 95-199 kV BIL
15 97.00 97.50 97.18 96.80
30 97.50 97.90 97.63 97.30
45 97.70 98.10 97.86 97.60
75 98.00 98.33 98.12 97.90
112.5 98.20 98.49 98.30 98.10
150 98.30 98.60 98.42 98.20
225 98.50 98.73 98.57 98.53
300 98.60 98.82 98.67 98.63
500 98.70 98.96 98.83 98.80
750 98.80 99.07 98.95 98.91
1 000 98.90 99.14 99.03 98.99
1 500 - 99.22 99.12 99.09
2 000 - 99.27 99.18 99.15
2 500 - 99.31 99.23 99.20
3 000 - 99.34 99.26 99.24
3 750 - 99.38 99.30 99.28
5 000 - 99.42 99.35 99.33
7 500 - 99.48 99.41 99.39

Note:
- BIL means basic impulse insulation level
- The table of efficiencies shown above for dry-type transformers with BIL 20-199 kV are more stringent than those shown in CAN/CSA 802.2-06.
- If the kVA rating of the product falls between the kVA ratings set out in the table above, its minimum energy efficiency standard is an interpolation of the corresponding minimum efficiency standards specified for those ratings.
- For a three-phase transformer having multiple high-voltage windings and a voltage ratio other then 2:1, the minimum energy efficiency standard from the table or interpolated is reduced by 0.11.

Energy efficiency report

Basic information

  • name of product (dry-type transformer)
  • brand name
  • model number
  • manufacturer
  • name of the certification body or province that authorized the verification mark that will be affixed to the transformer

and product specific as listed in Schedule IV

  • kVA rating
  • single or three-phase
  • low voltage winding in volts
  • high voltage winding rating in volts
  • whether it is 1.2 kV class
  • BIL rating
  • tested efficiency in per cent
  • the loss, in watts, when under load (load loss)
  • the loss, in watts, when not under load (no-load loss)
  • whether it is three-phase with high-voltage windings and a voltage ratio that, between the highest and lowest of their nominal (rated) voltages, is other than 2:1 and
  • percentage impedance.

Import report

Required - see Introduction to Guide to the Regulations