Buck-Boost Transformers


    STANDARD FEATURES

    • Ratings from 50VA to 10,000VA
    • Three standard voltage groups:
      • 120/240-12/24
      • 120/240-16/32
      • 240/480-24/48
    • 50/60 Hz frequency
    • Encapsulated core & coils in a combination silica sand and resin compound
    • Designed with a heavy duty NEMA Type 3R enclosure
    • Insulation system: 115°C rise
    • ANSI C57.12.01
    • Single & three phase configurations available
    • UL listed & CSA certified

MGM provides buck-boost transformers as a simple and economical way to correct off-standard voltages from 95 to 500 volts, single and three-phase, in sizes up to 25 kVA. When the supply voltage is constantly too high or too low, (usually more than 55%), the equipment fails to operate at maximum efficiency. Buck Boosts are most commonly used for 240V equipment in a facility with 208V service or vice versa.

WHEN IS CORRECT VOLTAGE CRITICAL?

With nearly two-thirds of all electrical loads being A.C. motor loads, maintenance of the proper voltage to that motor is very important. If the supply line voltage is not maintained, motor winding current is increased causing reduced motor torque and escalating motor temperature, all of which results in the rapid loss of insulation life expectancy. Anytime you have a lower than standard voltage, equipment damage and failure can result.

Buck-boost transformers are an economical way to correct this potentially very serious problem. Anytime a line voltage change inthe 5-20% range is required, a buck-boost transformer should be considered as your first line of defense.

CAUSES OF VOLTAGE MISMATCH

  • Service voltage changes after equipment is installed
  • Voltage drop in power line
  • Error in equipment ordering
  • Utility cutback in source voltage

SIGNS OF VOLTAGE MISMATCHES

  • Overheating motors
  • Premature motor failures
  • Equipment not working due to low torque of motors
  • Nuisance tripping breakers
  • Long distance service runs
  • Improper, erratic, or no operation of equipment
  • Increase in energy costs
 

 

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. 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.”

 

Can buck-boost transformers be used on three-phase systems as well as single phase systems?

Yes. A single unit is used to buck or boost single phase voltage — two or three units are used to buck or boost three phase voltage. The number of units to be used in a three-phase installation depends on the number of wires in the supply line. If the three-phase supply is 4 wire Y, use three buck-boost transformers. If the 3-phase supply is 3 wire Y (neutral not available), use two buck-boost transformers.

 

ADVANTAGES OF PURCHASING FROM MGM

Buck Boost Offering
With over forty-five years of transformer experience and our long-standing commitment to quality and customer service, MGM Transformer will find the transformer that is right for your specific application.

  • Ratings from 50VA to 10,000VA
  • Three standard voltage groups:
    • 120/240-12/24
    • 120/240-16/32
    • 240/480-24/48
  • 50/60 Hz frequency
  • Encapsulated core & coils in a combination silica sand and resin compound
  • Designed with a heavy duty NEMA Type 3R enclosure
  • Insulation system: 115°C rise
  • ANSI C57.12.01
  • Single & three phase configurations available
  • UL listed & CSA certified

TESTING AND QUALITY CONTROL

MGM Transformer tests every transformer to satisfy the standards required by IEEE Standard C57.12.01 for Dry-Type Transformers and IEEE Standard C57.12.00 for liquid filled transformers. Our testing equipment ensures the highest quality transformers that meet all IEEE, and NEMA standards. We also offer customer witness testing on individual transformers. We also have the capability of providing a range of design tests and optional tests such as impulse, partial discharge, temperature rise, sound level, and others.

THE BETTER CHOICE!

MGM is a leader in the transformer industry, and a premiere manufacturer capable of fulfilling the most demanding applications. No one can provide a wider range of products and solutions than MGM!

SPECIFICATIONS – SINGLE PHASE BUCK BOOST TRANSFORMERS – 60 HZ

120 X 240 PRIMARY VOLTS – 12/24 SECONDARY VOLTS – 60 HZ

120 X 240 PRIMARY VOLTS – 16/32 SECONDARY VOLTS – 60 HZ

240 X 480 PRIMARY VOLTS – 24/48 SECONDARY VOLTS – 60 HZ

BUCK BOOST DIMENSIONAL DRAWINGS

 

BUCK BOOST WIRING DIAGRAMS

UNITS RATED 120 X 240 V INPUT: 12/24 V OUTPUT

 
UNITS RATED 120 X 240 V INPUT: 16/32 V OUTPUT
UNITS RATED 240 X 480 V INPUT: 24/48 V OUTPUT

 

 
 
 

BUCK BOOST WIRING DIAGRAMS – SINGLE PHASE FOR THREE PHASE APPLICATIONS

 

BUCK BOOST CONNECTION DIAGRAM

View Manual

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