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TitleEvaluation of Highly Efficient Distribution Transformer Design and Energy Standards Based on Load
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                            Evaluation of Highly Efficient Distribution Transformer Design and Energy Standards Based on Load
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In today’s world, with rising energy costs, concerns about global warming and diminishing resources, there is a rapidly growing movement towards energy savings
                        
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Page 1

UNLV Theses, Dissertations, Professional Papers, and Capstones

5-1-2012

Evaluation of Highly Efficient Distribution Transformer Design and Evaluation of Highly Efficient Distribution Transformer Design and

Energy Standards Based on Load Energy Standards Based on Load

James Sanguinetti
University of Nevada, Las Vegas, [email protected]

Follow this and additional works at: https://digitalscholarship.unlv.edu/thesesdissertations

Part of the Electrical and Electronics Commons, and the Oil, Gas, and Energy Commons

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Page 2

EVALUATION OF HIGHLY EFFICIENT DISTRIBUTION TRANSFORMER

DESIGN AND ENERGY STANDARDS BASED ON LOAD



by



James Richard Sanguinetti



Bachelor of Science
United States Naval Academy

2004





A thesis submitted in partial fulfillment
of the requirements for the




Master of Science in Electrical Engineering



Department of Computer and Electrical Engineering

Howard R. Hughes College of Engineering
The Graduate College







University of Nevada, Las Vegas
May 2012

Page 77

will examine a transformer with the higher education average loading of 12.73 per cent.

For this case, a load is needed that draws 12.73 percent of 75 kVA per phase at rated

primary voltage, or approximately equal to 34.5 A (rms) per phase. Figures 4.9 – 4.12

show the results of the simulation. From the figures below it can be determined that there

is an rms primary current of 33.9 A, secondary current of 33.4 A, and a transformer “core

loss” current of 0.48 A, per phase. From these currents and the various resistor values,

one can determine the loss through each of the circuit components. There is a loss of 9

watts in each primary coil, 20 watts in each secondary coil, and 396 watts in the

transformer core, with a load consuming approximately 9,203 watts per phase. Therefore

the total transformer loss is 483 watts, with an efficiency of 98.2 per cent for this load.

There is no manufacturer provided efficiency for this size load, but the simulation results

are lower than the 98.7 per cent advertised efficiency at the 25 per cent loading level.

Time

450ms 455ms 460ms 465ms 470ms 475ms 480ms 485ms 49
I(R1c)+0.25 I(R1b)-0.5 I(R1a)+0.25

-60A

-40A

-20A

-0A

20A

40A

60A

(476.409m,47.925)(465.309m,47.926)(454.209m,47.943)



Figure 4.9 Balanced, Linear 12.73% Loading, 225 kVA – Primary Currents (peak)

67

Page 78

Time

450ms 455ms 460ms 465ms 470ms 475ms 480ms 485ms
-I(RLa) -I(RLb) -I(RLc)

-60A

-40A

-20A

-0A

20A

40A

60A

(476.409m,47.248)(465.309m,47.247)(454.159m,47.247)



Figure 4.10 Balanced, Linear 12.73% Loading, 225 kVA – Secondary Currents (peak)

Time

450ms 455ms 460ms 465ms 470ms 475ms 480ms 485ms 49
-I(RCa) -I(RCb) -I(RCc)

-800mA

-400mA

0A

400mA

800mA
(476.409m,679.345m)(465.259m,679.337m)(454.159m,679.344m)



Figure 4.11 Balanced, Linear 12.73% Loading, 225 kVA – Current through Rc (peak)

68

Page 153

143

[51] Sanguinetti, James and Yahia Baghzouz. Evaluation of Harmonic Current
Reduction for the Purpose of Energy Savings – A Case Study.” 14th International
Conference on Harmonics and Quality of Power, 26-29 September 2010, pp. 1-5.

[52] Mohan, Ned, Tore Undeland and William Robins. Power Electronics: Converters,
Applications, and Design, 3rd Edition. Hoboken, NJ: John Wiley and Sons, Inc, 2003:
p.119.

[53] Northeast Energy Efficiency Partnerships, Inc. “Metered Load Factors for Low-
Voltage, Dry-Type Transformers in Commercial, Industrial , and Public Buildings.” The
Cadmus Group, Inc. 7 December, 1999.

[54] Anthony, Michael. “APPA CATF Call for Electrical Loading Data.” Email to
numerous recipients. 14 June 2011.

Page 154

VITA


Graduate College
University of Nevada, Las Vegas


James Richard Sanguinetti






Degrees:
Bachelor of Science, Electrical Engineering, 2004
United States Naval Academy


Thesis Title: Evaluation of Highly Efficient Distribution Transformer Design and Energy
Standards Based on Load


Thesis Examination Committee:
Chairperson, Dr. Yahia Baghzouz, Ph. D.
Committee Member: Dr. Sahjendra Singh, Ph. D.
Committee Member: Dr. Biswajit Das, Ph. D.
Graduate Faculty Representative: Dr. Robert Boehm, Ph. D.

144

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