SECTION-7.pdf - Section 7 Buck-Boost Transformers A simple and economical way to correct offstandard voltages from 95 to 500 volts single and three

Buck-Boost Transformers A simple and economical way to correct offstandard voltages... from 95 to 500 volts; single and three phase, in sizes up to 360 kVA. Simplified buck-boost rating charts make proper transformer selection easy, accurate. Section 7

2 toll free 800.334.5214 ACME ELECTRIC | Electrical/electronic equipment operate on standard supply voltage. When the supply voltage is constantly 5-20% too low (“brownout” conditions) or too high, equipment fails to operate at maximum efficiency. This can cause potentially serious problems. Acme Electric Buck-boost transformers (autotransformers) provide a simple and ECONOMICAL means of correcting off-standard voltages. They offer tremendous capabilities and flexibility in kVA sizes and input/output voltage combinations. You essentially get 75 different transformers... all in one convenient package. Proper voltage is critical for a variety of applications, including AC motor loads, resistive heating loads, incandescent lighting or low voltage lighting. Sections • Section 1: Dry-Type Distribution Transformers • Section 2: Medium Voltage Transformers • Section 3: Harmonic Mitigating & Non-Linear Load Transformers • Section 4: Drive Isolation & AC Line Reactors • Section 5: Industrial Control Transformers • Section 6: DIN-Rail Power Supplies/Receptacles & Low Voltage Lighting Transformers • Section 7: Buck-Boost Transformers • Section 8: Panel-Tran Zone Power Centers • Section 9: Power Conditioning Products • Section 10: Amveco Toroidal Solutions • Section 11: Custom Solutions Table Of Contents Section 7: Buck-Boost Transformers Buck-Boost Transformers S e c t i o n 7 | Ta b l e o f C o n t e n t s Description & Applications .............................................................. 3 Questions & Answers ................................................................. 4 - 8 Selection Charts ....................................................................... 9 - 16 Wiring Diagrams .................................................................... 16 - 18 Warranty & Index ........................................................................... 19

3 toll free 800.334.5214 ACME ELECTRIC | Where are buck-boost transformers used? A typical buck-boost application is 120 volts in, 12 volts out for low voltage lighting or control circuitry. In most applications, this low voltage transformer is field connected as an autotransformer. (See question 2 for the definition of an autotransformer). Buck-boost transformers provide tremendous capabilities and flexibility in kVA sizes and input/output voltage combinations. Basically you get 75 different transformers... all in one convenient package. Other buck-boost applications are, where (A) low supply voltage exists because equipment is installed at the end of a bus system; (B) the supply system is operating at or over its design capacity; and (C) where overall consumer demands may be so high the utility cuts back the supply voltage to the consumer causing a “brownout.” Why use buck-boost instead of another type transformer ? Take a look at the advantages and disadvantages of using a buck-boost transformer (autotransformer) compared to a standard isolation transformer of the proper size and voltage combination.