Code of Federal Regulations – Title 10 – Energy

Title 10

Energy

CODE OF FEDERAL REGULATIONS

Parts 200 to 499

Revised as of January 1, 2015

Containing a codification of documents of general applicability and future effect

As of January 1, 2015

Published by the Office of the Federal Register National Archives and Records Administration as a Special Edition of the Federal Register

Department of Energy

TABLE 1-NORMAL IMPEDANCE RANGES FOR LIQUID-IMMERSED TRANSFORMERS

Single-phase transformers Three-phase transformers
kVA Impedance

(%)

kVA Impedance

(%)

37.5 …….. 1.0–4.5 75 1.0-5.0
50 ……….. 1.5–4.5 112.5 1.2-6.0
75 ···· ·· ···

100 ………

1.5–4.5

1.5–4.5

150

225

1.2-6.0

1.2-6.0

167 ……… 1.5–4.5 300 1.2-6.0
250 ……… 1.5-6.0 500 1.5–7.0
333 ……… 1.5-6.0 750 5.0-7.5
500 ·········

667 ………

1.5-7.0

5.0-7.5

1000

1500

5.0-7.5

5.0–7.5

833 ……… 5.0-7.5 2000 5.0-7.5
2500 5.0–7.5

TABLE 2-NORMAL IMPEDANCE RANGES FOR DRY-TYPE TRANSFORMERS

Single-phase transformers Three-phase transformers
kVA Impedance

(%)

kVA Impedance

(%)

15 ……….. 1.5-6.0 15 1.5-6.0
25 ……….. 1.5-6.0 30 1.5-6.0
37.5 …….. 1.5-6.0 45 1.5-6.0
50 ……….. 1.5-6.0 75 1.5-6.0
75 ……….. 2.0-7.0 112.5 1.5-6.0
100 ……… 2.0-7.0 150 1.5-6.0
167 ……… 2.5–8.0 225 3.0-7.0
250 ·········

333 ………

3.5–8.0

3.5–8.0

300

500

3.0–7.0

4.5-6.0

500 3.5–8.0 750 5.0–8.0
667 ……… 5.0–8.0 1000 5.0-6.0
833 ……… 5.0-6.0 1500 5.0–8.0
2000 5.0–8.0
2500 5.0–8.0

Temperature correction means the mathematical correction(s) of meas­urement data, obtained when a trans­ former is tested at a temperature that is different from the reference tem­perature, to the value(s) that would have been obtained if the transformer had been tested at the reference tem­perature.

Test current means the current of the electrical power supplied to the trans­ former under test.

Test frequency means the frequency of the electrical power supplied to the transformer under test.

Test voltage means the voltage of the electrical power supplied to the trans­ former under test.

Testing transformer means a trans­ former used in a circuit to produce a specific voltage or current for the pur­ pose of testing electrical equipment.

Total loss means the sum of the no­ load loss and the load loss for a trans­ former.

§431.196

Transformer means a device con­sisting of 2 or more coils of insulated wire that transfers alternating current by electromagnetic induction from 1 coil to another to change the original voltage or current value.

Transformer with tap range of 20 per­cent or more means a transformer with multiple voltage taps, the highest of which equals at least 20 percent more than the lowest, computed based on the sum of the deviations of the voltages of these taps from the transformer’s nominal voltage.

Uninterruptible power supply trans­ former means a transformer that is used within an uninterruptible power system, which in turn supplies power to loads that are sensitive to power failure, power sags, over voltage, switching transients, line noise, and other power quality factors.

Waveform correction means the adjust­ment(s) (mathematical correction(s)) of measurement data obtained with a test voltage that is non-sinusoidal, to a value(s) that would have been obtained with a sinusoidal voltage.

Welding transformer means a trans­ former designed for use in arc welding equipment or resistance welding equip­ment.

(70 FR 60416, Oct. 18, 2005, as amended at 71

FR 24995, Apr. 27, 2006; 71 FR 60662, Oct. 16,

2006; 72 FR 58239, Oct. 12, 2007; 78 FR 23433,

Apr. 18, 2013]

TEST PROCEDURES

  • 431.193 Test procedures for meas­uring energy consumption of dis­tribution transformers.

The test procedures for measuring the energy efficiency of distribution transformers for purposes of EPCA are specified in appendix A to this subpart.

(71 FR 24997, Apr. 27, 2006]

ENERGY CONSERVATION STANDARDS

  • 431.196 Energy conservation stand­ards and their effective dates.

(a) Low-Voltage Dry- Type Distribution Transformers. (1) The efficiency of a low-voltage, dry-type distribution transformer manufactured on or after January 1, 2007 , but before January 1, 2016, shall be no less than that required for the applicable kVA rating in the

§ 431.196

table below. Low-voltage dry-type dis­tribution transformers with kVA rat­ ings not appearing in the table shall have their minimum efficiency level determined by linear interpolation of the kVA and efficiency values imme­diately above and below that kVA rat­ing.

Single-phase Three-phase

10 CFR Ch. II (1-1-15 Edition)

Single-phase Three-phase
kVA Efficiency

(%)

kVA Efficiency

(%)

10

15

25

37.5 ………..

50 …………..

75 …………..

100

167

250

333

500

667

833

98.62

98.76

98.91

99.01

99.08

99.17

99.23

99.25

99.32

99.36

99.42

99.46

99.49

15 …………..

30 …………..

45 …………..

75

112.5 ………

150 ·······-····

225 …………

300 …………

500 …………

750 …………

1000 ……….

1500 ……….

2000 ··········

2500 ……….

98.36

98.62

98.76

98.91

99.01

99.08

99.17

99.23

99.25

99.32

99.36

99.42

99.46

99.49

 

immersed distribution transformers with kVA ratings not appearing in the table shall have their minimum effi­ciency level determined by linear in­terpolation of the kVA and efficiency values immediately above and below that kVA rating.

kVA % kVA %
15 97.7 15 97.0
25 98.0 30 97.5
37.5 ……….• 98.2 45 …………•. 97.7
50 ………….. 98.3 75 .. ……….. 98.0
75 ………….. 98.5 112.5 ……… 98.2
100 98.6 150 ………… 98.3
167 98.7 225 ………… 98.5
250 98.8 300 ………… 98.6
333 98.9 500 ··· ········ 98.7
750 ………… 98.8
1000 ………. 98.9

Note: All efficiency values are at 35 percent of nameplate­ rated load. determined according to the DOE Test Method for Measuring the Energy Consumption of Distribution Trans­formers under Appendix A to Subpart K of 10 CFR part 431.

Single-phase Three-phase
kVA Efficiency

(%)

kVA Efficiency

(%)

15 97.70 15 ………….. 97.89
25 98.00 30 ………….. 98.23
37.5 ……….. 98.20 45 ………….. 98.40
50 …..•……•. 98.30 75 ………….. 98.60
75 ………….. 98.50 112.5 ……… 98.74
100 98.60 150 ………… 98.83
167 98.70 225 ………… 98.94
250 98.80 300 ………… 99.02
333 98.90 500 ………… 99.14
750 …····· ·· 99.23
1000 ……… 99.28

 

(2) The efficiency of a low-voltage dry-type distribution transformer man­ufactured on or after January 1, 2016, shall be no less than that required for their kVA rating in the table below. Low-voltage dry-type distribution transformers with kVA ratings not ap­pearing in the table shall have their minimum efficiency level determined by linear interpolation of the kVA and efficiency values immediately above and below that kVA rating.

Note: All efficiency values are at 50 percent of nameplate­ rated load, determined according to the DOE Test-Proce­ dure, Appendix A to Subpart K of 10 CFR part 431.

Single-phase Three-phase
kVA Efficiency

(%)

kVA Efficiency

(%)

10

15

25

37.5 ………..

50 …….. …..

75 …….. …..

100 …………

167 … ……..

250 …………

333 ………..•

500 …… …..

667 …… …..

833 …………

98.70

98.82

98.95

99.05

99.11

99.19

99.25

99.33

99.39

99.43

15 …………..

30 …………..

45 ….

75 …………..

112.5 ………

150 …………

225 …………

300 ………..

500

750 …… …..

98.65

98.83

98.92

99.03

99.11

99.16

99.23

99.27

99.35

99.40

99.43

99.48

99.51 99.53

99.49 1000 ……….

99.52 1500 ···· ····

99.55 2000 ……. ..

2500 ……….

 

(2) The efficiency of a liquid-im­mersed distribution transformer manu­factured on or after January 1, 2016, shall be no less than that required for their kVA rating in the table below. Liquid-immersed distribution trans­formers with kVA ratings not appear­ing in the table shall have their min­imum efficiency level determined by linear interpolation of the kVA and ef­ficiency values immediately above and below that kVA rating.

Note: All efficiency values are at 35 percent of nameplate­ rated load, determined according to the DOE Test Method for Measuring the Energy Consumption of Distribution Trans­ formers under Appendix A to Subpart K of 10 CFR part 431.

(b) Liquid-Immersed Distribution Trans­formers. (1) The efficiency of a liquid­ immersed distribution transformer manufactured on or after January 1, 2010, but before January 1, 2016, shall be no less than that required for their kVA rating in the table below.

Note: All efficiency values are at 50 percent of nameplate­ rated load, determined according to the DOE Test Method for Measuring the Energy Consumption of Distribution Trans­formers under Appendix A to Subpart K of 10 CFR part 431.

(c) MediumVoltage DryType Distribu­tion Transformers. (1) The efficiency of a medium-voltage dry-type distribution