Acme Electric Acme Electric N85 W12545 Westbrook Crossing Menomonee Falls, WI 53051 800.334.5214 Commercial construction • industrial automation Full Line Product Catalog full line product Catalog ©2013 Electrical Holdings LLC. All rights reserved.

ACME ELECTRIC Leadership in Quality Designed Products And Quality Customer Satisfaction For over eighty-eight years, Acme Electric has been manufacturing power conversion and power conditioning equipment for use in industrial, commercial and OEM applications. Acme has built its reputation as a true industry leader by providing superior service, quality and technical expertise to the transformer market. Acme Electric is a full line manufacturer of low voltage (600V and below) dry type distribution transformers, industrial control transformers and power quality equipment. With roughly 1300 catalog...

©2013 Electrical Holdings LLC. All rights reserved. Information contained in this catalog is subject to change without notice and therefore cannot be guaranteed by Acme.

Panel-Tran® Zone Power Centers Air Conditioning, Refrigeration & Appliance Transformers Power Conditioning Products

DRY-TYPE DISTRIBUTION TRANSFORMERS Transformer Questions & Answers 1. What is a transformer and how does it work? A transformer is an electrical apparatus designed to convert alternating current from one voltage to another. It can be designed to “step up” or “step down” voltages and works on the magnetic induction principle. A transformer has no moving parts and is a completely static solid state device, which insures, under normal operating conditions, a long and trouble-free life. It consists, in its simplest form, of two or more coils of insulated wire wound on a laminated steel core. When...

DRY-TYPE DISTRIBUTION TRANSFORMERS load is 40 amperes, such as a motor, and the secondary voltage is 240 volts, then 240 x 40 equals 9600 VA. A 10 kVA (10,000volt-amperes) transformer is required. ALWAYS SELECT THE TRANSFORMER LARGER THAN THE ACTUAL LOAD. This is done for safety purposes and allows for expansion, in case more load is added at a later date. For 3 phase kVA, multiply rated volts x load amps x 1.73 (square root of 3) then divide by 1000. (4) Determine whether taps are required. Taps are usually specified on larger transformers. (5) Use the selection charts in Section I. 11. What...

DRY-TYPE DISTRIBUTION TRANSFORMERS Example: Determine the interrupting capacity, in amperes, of a circuit breaker or fuse required for a 75 kVA, three phase transformer, with a primary of 480 volts delta and secondary of 208Y/120 volts. The transformer impedance (Z) = 5%. If the secondary is short circuited (faulted), the following capacities are required: Normal Full Load Current = Volt Amps √ 3 x Line Volts 90 Amps Maximum Short Circuit Line Current = Full Load Amps = 90 Amps 5% 5% 1,800 Amps The breaker or fuse would have a minimum interrupting rating of 1,800 amps at 480 volts. NOTE: The...

DRY-TYPE DISTRIBUTION TRANSFORMERS one low voltage terminal unconnected. When the transformer is excited, the resultant voltage appearing across a voltmeter will be the sum of the high and low voltage windings. This is useful when connecting single phase transformers in parallel for three phase operations. Polarity is a term used only with single phase transformers. 30. hat is exciting current? Exciting current, when W used in connection with transformers, is the current or amperes required for excitation. The exciting current on most lighting and power transformers varies from approximately...

DRY-TYPE DISTRIBUTION TRANSFORMERS 36. an 4-Winding Single Phase Transformer be autoC connected? Yes. There are occasions where 480 volts single phase can be stepped down to 240 volts single phase by autoconnecting a standard 4-winding isolating transformer as shown in Figure 1. If connected in this manner, the nameplate kVA is doubled. For example: A 10 kVA load can be applied to a 5 kVA 4-winding transformer if connected per Figure 1. 480V H1 38. hat is meant by “Balanced Loading” on Single Phase W Transformer applications? Since most single phase transformers have a secondary voltage of 120/240,...

DRY-TYPE DISTRIBUTION TRANSFORMERS Steps for Selecting the Proper Transformer SINGLE PHASE LOADS 1. Determine electrical load A. Voltage required by load. B. Amperes or kVA capacity required by load. C. requency in Hz (cycles per second). F D. erify load is designed to operate on a single phase supply. V All of the above information is standard data normally obtained from equipment nameplates or instruction manuals. Full Load Current in Amperes– Single Phase Circuits 2. Determine supply voltage A. Voltage of supply (source). B. requency in Hz (cycles per second). F The frequency of the line supply...

DRY-TYPE DISTRIBUTION TRANSFORMERS THREE PHASE LOADS 1. Determine electrical load A. Voltage required by load. B. mperes or kVA required by load. A C. requency in Hz (cycles per second). F D. erify load is designed to operate on three phase. V All the above information is standard data normally obtained from equipment nameplates or instruction manuals. 2. Determine supply voltage A. Voltage of supply (source). B. requency in Hz (cycles per second). F The frequency of the line supply and electrical load must be the same. A three phase transformer is selected which is designed to operate at this...

DRY-TYPE DISTRIBUTION TRANSFORMERS UL-3R Enclosures ENCAPSULATED SINGLE PHASE, .05 to .150 kVA FEATURES L listed, CSA certified and UL-3R enclosure meets or exceeds all listing U criteria including NEMA, ANSI and OSHA standards. asy and convenient installation to meet your re­ uirements, the transformer E q can be mounted in any position. ong Life UL class 130°C insulation system. Transformers can be banked for L three phase service. arge wiring compartment, no conduit or pull boxes required. Front access L for wiring ease. Wiring compartment remains cool. ompletely enclosed UL-3R enclosure for...