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)
|
|||||||||||||
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.
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
(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.
|
|||||||||||||||
(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) Medium– Voltage Dry–Type Distribution Transformers. (1) The efficiency of a medium-voltage dry-type distribution
