1May 07

Transformers

2May-07

Distribution Transformer Energy Conservation Standards;

Proposed Rule

Department of EnergyOffice of Energy Efficiency and

Renewable Energy

3May 07

Department of EnergyOffice of Energy Efficiency and Renewable Energy

• “Pursuant to the Energy Policy and Conservation Act, as amended, the Department is proposing energy conservation standards for liquid-immersed and medium voltage, dry-type distribution transformers. The Department believes these standards will achieve the maximum improvement in energy efficiency that is technologically feasible and economically justified and will result in significant energy savings.”

• http://www.eere.energy.gov/buildings/appliance_standards/commercial/

distribution_transformers.html

4May 07

History

• July, 1996 Oak Ridge National Laboratory (ORNL) published “Determination Analysis of Energy Conservation Standards for Distribution Transformers”

• September 1997, ORNL published “Supplement to the Determination Analysis and NEMA Efficiency Standard for Distribution Transformers”

• October 26, 1997, the Secretary of Energy “determined based on the best information available, that energy conservation standards for eclectic distribution transformers are technologically feasible, economically justified and would result in significant energy savings”

• November 1, 2000, the Department held public meetings

• July 29, 2004, The Department published a ANOPR

• August 8, 2005, President Bush Signed into law an act establishing minimum efficiency levels for low-voltage, dry-type transformers

• August 4, 2006, the Department issued the NOPR we are talking about today.

5May 07

Department of EnergyOffice of Energy Efficiency and Renewable Energy

• The DOE (Department of Energy) has issued a NOPR (Notice of Proposed Rulemaking). In this notice, the Department is proposing energy conservation standards for distribution transformers

6May 07

Proposed Standard

Single-Phase Three-Phase

kVADOE

EfficiencykVA

DOEEfficiency

10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.4 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.36

15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.56 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.62

25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.73 45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.76

37.5. . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.85 75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.91

50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.90 112.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.01

75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.04 150. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.08

100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.10 225. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.17

167 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.21 300. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.23

250 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.26 500. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.32

333 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.31 750. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.24

500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.38 1000. . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.29

667 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.42 1500. . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.36

833 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.45 2000. . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.40

2500. . . . . . . . . . . . . . . . . . . . . . . . . . . . 99.44

7May 07

Proposed Standard

Single-Phase Three-Phase

kVADOE

EfficiencyNEMA

EfficiencykVA

DOEEfficiency

NEMAEfficiency

10 . . . . . . . . . . . . . . . . . . . 98.40 98.4 15 . . . . . . . . . . . . . . . . . . . 98.36 98.1

15 . . . . . . . . . . . . . . . . . . . 98.56 98.6 30 . . . . . . . . . . . . . . . . . . . 98.62 98.4

25 . . . . . . . . . . . . . . . . . . . 98.73 98.7 45 . . . . . . . . . . . . . . . . . . . 98.76 98.6

37.5. . . . . . . . . . . . . . . . . . 98.85 98.8 75 . . . . . . . . . . . . . . . . . . . 98.91 98.7

50 . . . . . . . . . . . . . . . . . . . 98.90 98.9 112.5 . . . . . . . . . . . . . . . . 99.01 98.8

75 . . . . . . . . . . . . . . . . . . . 99.04 99.0 150. . . . . . . . . . . . . . . . . . 99.08 98.9

100 . . . . . . . . . . . . . . . . . . 99.10 99.0 225. . . . . . . . . . . . . . . . . . 99.17 99.0

167 . . . . . . . . . . . . . . . . . . 99.21 99.1 300. . . . . . . . . . . . . . . . . . 99.23 99.0

250 . . . . . . . . . . . . . . . . . . 99.26 99.2 500. . . . . . . . . . . . . . . . . . 99.32 99.1

333 . . . . . . . . . . . . . . . . . . 99.31 99.2 750. . . . . . . . . . . . . . . . . . 99.24 99.2

500 . . . . . . . . . . . . . . . . . . 99.38 99.3 1000. . . . . . . . . . . . . . . . . 99.29 99.2

667 . . . . . . . . . . . . . . . . . . 99.42 99.4 1500. . . . . . . . . . . . . . . . . 99.36 99.3

833 . . . . . . . . . . . . . . . . . . 99.45 99.4 2000. . . . . . . . . . . . . . . . . 99.40 99.4

2500. . . . . . . . . . . . . . . . . 99.44 99.4

8May 07

Evaluation

Design Line 1 = 50kVA 1-phase Design Line 9 = 300kVA dry-typeDesign Line 2 = 25kVA 1-phase Design Line 10 = 1500kVA dry-typeDesign Line 3 = 500kVA 1-phase Design Line 11 = 300kVA dry-typeDesign Line 4 = 150kVA 3-phase Design Line 12 = 1500kVA dry-typeDesign Line 5 = 1500kVA 3-phase Design Line 13 = 2000kVA dry-type

9May 07

Issues

• Transformer cost will increase• Possible availability issues• More efficient transformers will be larger & heavier• The energy savings will not be seen by delivery companies• There are several different opinions on the accuracy of the

analysis done by the DOE• The department is proposing not to include energy

conservation standards for used, repaired, and rebuilt distribution transformers

• EEI is proposing we implement level 2 in 2009 and level 4 in 2013

10May 07

Standard & Effective Dates

Liquid-immersed distribution transformers manufactured on or after January 1, 2010, shall have an efficiency no less than:

11May-07

Questions?