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Jefferson Electric Inc.
JEFFERSON ELECTRIC, INC.
Buck-Boost Transformer Application Manual

Table of Contents

I.
Introduction............................................................................................................. 2
II.
Choosing the Proper Transformer........................................................................... 2
III.
Rapid Selector Charts ............................................................................................. 4
Single Phase Chart .................................................................................................. 4
Open Delta Chart .................................................................................................... 6
Wye Chart ............................................................................................................... 7
IV.
Connection Instructions and Diagrams................................................................... 9
Single Phase ............................................................................................................ 9
3 Phase Wye.......................................................................................................... 11
3 Phase Open Delta............................................................................................... 15
V.
Typical Questions ................................................................................................. 20
VI.
Misapplications..................................................................................................... 21
Buck-Boost Application manual 02-12
1-800-892-3755
Revised on February 15, 2012
www.jeffersonelectric.com
Page 1 of 21

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Summary of Contents for Jefferson Electric Buck-Boost Series

  • Page 1: Table Of Contents

    Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com JEFFERSON ELECTRIC, INC. Buck-Boost Transformer Application Manual Revised on February 15, 2012 Table of Contents Introduction......................2 Choosing the Proper Transformer................2 III. Rapid Selector Charts ..................... 4 Single Phase Chart ....................4 Open Delta Chart ....................6 Wye Chart .......................
  • Page 2: Introduction

    1-800-892-3755 www.jeffersonelectric.com Introduction Jefferson Electric Buck-Boost transformers are low voltage isolation transformers that can be connected in an auto-transformer arrangement to provide a convenient and economical way to raise or lower single and three-phase voltages from 5-20%. The auto- transformer arrangement allows smaller and less expensive Buck-Boost transformers to supply large power loads.
  • Page 3 Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com Step 2: What is the source and load voltage? ♦ -Are you stepping up or stepping down the voltage? o Stepping up: Go to the LV column in the charts and find your source voltage.
  • Page 4: Rapid Selector Charts

    Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com III. Rapid Selector Charts Single Phase Chart (requires 1 transformer) High Catalog Load Voltage Voltage Number Required Diagram Diagram (LV) (HV) 416-12xx 0.37 0.56 0.94 11.2 18.8 56-B Amperes 3.95 5.93 9.89 19.7 29.6 39.5 59.3...
  • Page 5 Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com High Catalog Load Voltage Voltage Number Required Diagram Diagram (LV) (HV) 416-11xx 0.95 14.3 19.0 28.6 47.6 56-D Amperes 4.58 6.88 11.4 22.9 34.4 45.8 68.8 91.7 416-11xx 10.0 15.0 20.0 30.0 50.0 56-D Amperes 4.58...
  • Page 6: Open Delta Chart

    Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com Open Delta Chart (requires 2 transformers) High Catalog Load Voltage Voltage Number Required Diagram # Diagram # (LV) (HV) 416- 0.86 1.29 12.9 17.2 25.0 43.0 14xx Amperes 10.3 15.4 20.7 31.0 41.4 60.1 57-B 416- 1.27...
  • Page 7: Wye Chart

    Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com High Catalog Load Voltage Voltage Number Required Diagram # Diagram # (LV) (HV) 416- 3.64 5.47 18.2 27.2 36.4 54.7 72.8 14xx Amperes 10.4 20.8 31.2 41.7 62.7 83.4 57-C 416- 2.86 14.2 19.0 28.6 38.1...
  • Page 8 Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com High Catalog Load Voltage Voltage Number Required Diagram Diagram (LV) (HV) 416-11xx 15.0 22.5 30.0 45.0 60.0 90.0 58-D Amperes 4.58 6.88 11.4 22.9 34.4 45.8 68.8 91.7 416-12xx 58-C 11.2 22.5 33.7 45.0 67.5 90.0...
  • Page 9: Connection Instructions And Diagrams

    Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com Connection Instructions and Diagrams Single Phase WIRING DIAGRAM #1 (56-A) Step 1: Connect LV1, H1, H3 & HV1 together. Step 2: Connect H2, H4, LV2, X1 & X3 together. Step 3: Connect X2, X4 & HV2 together.
  • Page 10 Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com WIRING DIAGRAM #3 (56-C) Step 1: Connect LV1, H1 & HV1 together. Step 2: Connect H2 & H3 together. Step 3: Connect H4, LV2, X1 & X3 together. Step 4: Connect X2, X4 & HV2 together.
  • Page 11: Phase Wye

    Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com 3 Phase Wye WIRING DIAGRAM #5 (58-A) Transformer #1 Transformer #2 Transformer #3 Part A (Transformer #1): Step 1: Connect H1 & H3 together. Step 2: Connect H2, H4, X1, X3 & LOW VOLTAGE AØ-Phase together.
  • Page 12 Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com WIRING DIAGRAM #6 (58-B) Transformer #1 Transformer #2 Transformer #3 Part A (Transformer #1): Step 1: Connect H1 & H3 together. Step 2: Connect H2, H4, X1 & LOW VOLTAGE AØ-Phase together. Step 3: Connect X2 & X3 together.
  • Page 13 Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com WIRING DIAGRAM #7 (58-C) Transformer #1 Transformer #2 Transformer #3 Part A (Transformer #1): Step 1: Connect H2 & H3 together. Step 2: Connect H4, X1, X3 & LOW VOLTAGE AØ-Phase together. Step 3: Connect X2, X4 & HIGH VOLTAGE AØ-Phase together.
  • Page 14 Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com WIRING DIAGRAM #8 (58-D) Transformer #1 Transformer #2 Transformer #3 Part A (Transformer #1): Step 1: Connect H2 & H3 together. Step 2: Connect H4, X1 & LOW VOLTAGE AØ-Phase together. Step 3: Connect X2 & X3 together.
  • Page 15: Phase Open Delta

    Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com 3 Phase Open Delta WIRING DIAGRAM #9 (57-A) Transformer #1 Transformer #2 Part A (Transformer #1): Step 1: Connect X2, X4 & HIGH VOLTAGE AØ-Phase together. Step 2: Connect X1, X3, H2, H4 & LOW VOLTAGE AØ-Phase together.
  • Page 16 Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com WIRING DIAGRAM #10 (57-B) Transformer #1 Transformer #2 Part A (Transformer #1): Step 1: Connect X4 & HIGH VOLTAGE AØ-Phase together. Step 2: Connect X2 & X3 together. Step 3: Connect X1, H2, H4 & LOW VOLTAGE AØ-Phase together.
  • Page 17 Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com WIRING DIAGRAM #11 (57-C) Transformer #1 Transformer #2 Part A (Transformer #1): Step 1: Connect X2, X4 & HIGH VOLTAGE AØ-Phase together. Step 2: Connect X1, X3, H4 & LOW VOLTAGE AØ-Phase together. Step 3: Connect H2 & H3 together.
  • Page 18 Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com WIRING DIAGRAM #12 (57-D) Transformer #1 Transformer #2 Part A (Transformer #1): Step 1: Connect X4 & HIGH VOLTAGE AØ-Phase together. Step 2: Connect X2 & X3 together. Step 3: Connect X1, H4 & LOW VOLTAGE AØ-Phase together.
  • Page 19: Typical Questions

    Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com Typical Questions What is the difference between an autotransformer and an isolation transformer? In an isolation transformer the input and output are completely separated and all the energy is transformed. In an autotransformer the input and output are electrically connected.
  • Page 20: Misapplications

    Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com Why does the nameplate read High Volts =120 x 240 and Low Volts = 12/24, when the chart shows that I can connect 208 volts in and 229 volts out ? The nameplate shows the rating for when the unit is used as an isolation transformer.
  • Page 21 Jefferson Electric Inc. 1-800-892-3755 www.jeffersonelectric.com called copper losses and increase as the load increases causing a larger voltage drop.) Since the current is dependent on the load, the voltage drop will fluctuate with the amount of load. The buck-boost units will correct the voltage drop at a constant percentage of the input voltage, if the input voltage changes as the load changes the output voltage will change at the same rate.

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