Rosenstock. Steven 

From: 

Sent: 

bounce-380121-53822@ls.eei.org on behalf of Rosenstock, Steven [SRosenstock@eei.org] 

Friday, October 19, 2007 12:27 PM 

To: 

Subject: 

Electric Light & Power to the National Electric Code 

Quick summary of transformer rule 

FYI and use. I also did a table showing the new values. If you are interested, please let me know (it is too large to send 

over the list serve). 

Steve 

EEl has reviewed the final rule on efficiency standards, and we wanted to provide you with a quick summary. Attached is 

a document with 2 tables, showing the efficiency levels that DOE analyzed during the NOPR process (1-6) and the values 

that DOE selected for the final rule. 

Liquid-Filled, Single-Phase Transformers 

For units rated ~ 10 kVA and ~ 100 kVA, DOE decided on Level 4~ (values between Levels 4 and 5). Many of the values 

are closer to Level 5 than Level 4. 

DOE chose Level 4 efficiency for units rated at 167 kV A. 

For units rated ~ 250 kVA and ~ 833 kVA, DOE decided on Level 2~ (values between Levels 2 and 3). 

Liquid-Filled, Three-Phase Transformers 

For units rated ~ 15 kVA and ~ 300 kVA, DOE decided on Level 2. 

For units rated at 500 kVA, DOE chose Level 1 ~ (a value between Levels 1 and 2). 

For units rated at 750 kVA, DOE chose Level3~ (a value between Levels 3 and 4, but just slightly above Level 3). 

For units rated ~ 1000 kVA and ~ 2500 kV A, DOE chose Level 3. 

One of the reasons that DOE chose these levels was the manufacturers requesting an efficiency "match" between singlephase and three-phase units (e.g., 15 kVA single-phase and 45 kVA three-phase). As you will see from the tables, the 

efficiency values for single-phase units and the three-phase units that are 3 times larger in terms of kVA ratings are the 

same. 

The new standards go into effect on January 1, 2010. 

We hope this summary has been helpful. 

You are currently subscribed to elpnec as: [srosenstock@eei.org] 

To unsubscribe, forward this message to leave-380121-53822X@ls.eei.org 

1 
Table EA.3 Trial Standard Levels for PC 1 Distribution Transformers - NOPI<. 

Product Class 1 Liquid-Immersed, Medium-Voltage, Single-Phase Transformers 

TSL 

0 1 2 3 4 5 

Design kVA Ave. Min. TP 1 1/30fDiff 2/3 of Diff Min Max Energy 

Line Base Base between between LCC Savings with 

Case Case TP 1 and TP 1 and No Change 

Eff. Eff. MinLCC MinLCC inLCC 

10 98.42 97.77 98.4 98.40 98.44 98.48 98.69 

15 98.57 97.99 98.6 98.56 98.59 98.63 98.82 

DL2 25 98.74 98.23 98.7 98.73 98.76 98.79 98.96 

37.5 98.86 98.40 98.8 98.85 98.88 98.91 99.06 

DLl 50 98.97 98.56 98.9 98.90 98.90 99.04 99.19 

75 99.04 98.66 99.0 99.04 99.06 99.08 99.21 

100 99.11 98.75 99.0 99.10 99.12 99.14 99.26 

167 99.22 98.90 99.1 99.21 99.23 99.25 99.35 

250 99.24 98.89 99.2 99.26 99.36 99.45 99.69 

333 99.29 98.97 99.2 99.31 99.40 99.49 99.71 

DL3 500 99.36 99.07 99.3 99.38 99.46 99.54 99.74 

667 99.40 99.13 99.4 99.42 99.50 99.57 99.76 

833 99.44 99.l8 99.4 99.45 99.52 99.60 99.77 

EA-6 

6 

Max 

Energy 

Savings 

99.32 

99.39 

99.46 

99.51 

99.59 

99.59 

99.62 

99.66 

99.70 

99.72 

99.75 

99.77 

99.78 

Cf ff)?L. 

9'8,76 

<1 g. q / 

qq ,ol 

91. /;7B 

qq./7 

qq, 23 

q1. 2> 

11, "32-

11.36 

qq.y.-'2-

qq.1fb 

91, Y-1 
Table EA.4 Trial Standard Levels for PC 2 Distribution Transformers -/\1 oflre 

Product Class 2 Liquid-Immersed, Medium-Voltage, Three-Phase Transformers 

TSL 

0 1 2 3 4 5 

Design kVA Ave. Min. TP 1 1I30fDiff 2/3 of Diff Min Max Energy 

Line Base Base between between LCC Savings with 

Case Case TP 1 and TP 1 and No Change 

Eff. Eff, Min LCC MinLCC inLCC 

15 98.06 97.19 98.1 98.36 98.68 98.68 99.25 

30 98.37 97.64 98.4 98.62 98.89 98.89 99.37 

45 98.53 97.87 98.6 98.76 99.00 99.00 99.43 

75 98.70 98.12 98.7 98.91 99.12 99.12 99.50 

112.5 98.83 98.30 98.8 99.01 99.20 99.20 99.55 

DL4 150 98.91 98.42 98.9 99.08 99.26 99.26 99.58 

225 99.02 98 .57 99.0 99.17 99.33 99.33 99.62 

300 99.08 98.67 99.0 99.23 99.38 99.38 99.65 

500 99.19 98.83 99.1 99.32 99.45 99.45 99.69 

750 99.24 98.97 99.2 99.24 99.31 99.37 99.66 

lOOO 99.29 99.04 99.2 99.29 99.36 99.41 99.68 

DL5 1500 99.36 99.13 99.3 99.36 99.42 99.47 99.71 

2000 99.40 99.19 99.4 99.40 99.46 99.51 99.73 

2500 99.44 99.23 99.4 99.44 99.49 99.53 99.74 

EA-7 

6 

Max 

Energy 

Savings 

99.31 

99.42 

99.47 

99.54 

99.58 

99.61 

99.65 

99.67 

99.71 

99.66 

99.68 

99.71 

99.73 

99.74 

f)oe 

rlNAL 

«.. UL-e 

qg, 36 

qF},b2 

Q8,76 

9 fJ. q J 

qq,o/ 

1Q·oB 

Q1,/7 

<[1,13 

CfCfi 25 

Cfet. ] 2-

Q1.3b 

qcy~ ifL 

q'j. lfb 

19. Y-Cf 
and medium-voltage, dry-type transfonners. a Tables EA.1 and EA.2 summarize the proposed 

standard levels for the liquid-immersed and medium-voltage, dry-type transfonners. 

T a e bl EA , 1 P ropose d St an d d L I ar eve s f, or L' IqUl 'd -I mmerse dD't IS rI 'b U f Ion T rans ormers 

Single-Phase Proposed Efficiency Level Three-Phase Proposed Efficiency Level 

TSL2 TSL2 

PC 1 PC2 

kVA Efficiency .h 

/Vo,IJ1<. (%) f)Cf:. 

kVA Efficiency ~ 1-/0;;1<- (%) Pot; 

10 98.40/Qf), b2. 15 98.36 /q'aJ6 

15 98.56/ q 6'.76 30 98.62/1$,62 

25 98.73/ Cf'd, Gf I 45 98.76 /qe, 76 

37.5 98.85/9Q,0/ 75 98.91 /98/11 

50 98.90/0/9,08 112.5 99.01 /91. III 

75 99.04/QrJ7 150 99.08/Cf'J. (/8 

100 99.10/'fq, 'l3 225 99. 17/crr, 17 

167 99.21/ '1'1',25 300 99 .23/ eFf, l] 

250 99.26/'1Q,12 500 99.32/Qr, 2)' 

333 99.3 1/Q,36 750 99.24/QQ,'32 

500 99.38/rJr, CfL 1000 99.29/tfCf,ft 

667 99.42/99'. Y-6 1500 99.36/qCj. y.~ 

833 99.45/ q9.1f'f 2000 99.40 /tf9, 'It 

2500 99.44/Qq·H 

Note: All effiCIency values are at 50% of nameplate rated load, determmed accordmg to the DOE test procedure. 

a Because the Energy Policy Act of2005 established energy conservation standards for low-voltage, dry-type 

distribution transformers, the Department has removed this type oftransformer from the NOPR stage of its analysis. 

EA-3