AAA Acme General Electrical
Power Transformer Distribution
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Dry Distribution Transformers

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Dry Type Distribution and Control Transformers : OPTI-Miser(R) low temperature rise transformers Non-Linear (K-rated) transformers for harmonic loads Drive isolation transformers (DIT) Industrial control (machine tool) transformers Buck Boost transformers PANEL-TRAN(R) zone power centers Air conditioning, refrigeration and appliance transformers Low Voltage Lighting Transformers Shielded Power in: Three Phase 3 to 75 KVA Single Phase 37.5 to 250 KVA Three Phase 25 to 1000 KVA Single Phase, .05-.150 KVA Single-Phase, .250-25 KVA

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transformer guide
transformer guide



State-of-the-Art Transformer Sales
Transformer Specification Guide for Acme Electric

The following spec sheets cover Acme's line of single and three phase, encapsulated and air cooled dry type distribution transformers. They are intended for use with engineering submittals. Additional information can be obtained by contacting the factory.

Dry Type Distribution Transformers, Including

Opti-miser(R) 30 KVA and Larger

1.0 Dry Type transformers:

1.0.1 Provide dry type, enclosed and ventilated transformers as indicated herein. Transformers shall be Acme Transformer or approved equal.

1.0.2 Transformers shall be designed, constructed and rated in accordance with UL, CSA, NEMA, ANSI, IEEE, and OSHA standards.

1.0.3 Transformers rated 27 KVA and larger, single and three phase shall be the ventilated type, incorporating a 220 degree C insulation system and designed not to exceed 150 degree C temperature rise above a 40 degree C ambient under full load conditions. Taps are to be provided on the primary side of the transformer as follows:

(a) 2 - 2.5% above normal full capacity.

4 - 2.5% below normal full capacity.

-Or-

(b) 2 - 2.5% above normal full capacity.

2 - 2.5% below normal full capacity.

Alternate 1: 115 degree C rise transformers shall incorporate a 220 degree C insulation system and be designed not to exceed 115 degree C temperature rise above a 40 degree C ambient under full load conditions. In addition, the transformer shall have the ability to carry a continuous 15% overload without exceeding a 150 degree C rise above ambient.

Alternate 2: 80 degree C rise Transformers shall incorporate a 220 degree C insulation system and be designed not to exceed 80 degree C temperature rise above a 40 degree C ambient under full load conditions. In addition, the transformer shall have the ability to carry a continuous 30% overload without exceeding a 150 degree C rise above ambient.

1.0.4 Transformer enclosure finish must be ASA 61 gray powder polyurethane paint. Transformer enclosure temperature shall not exceed 50 degrees C plus the ambient under any condition of loading at any specified temperature rise at or below 150 degrees C.

1.0.5 Transformer enclosure shall be UL/NEMA Type 2 and UL 3R Listed with the addition of a weather shield and shall be so marked on the transformer.

1.0.6 Transformer shall incorporate an electrostatic shield for the attenuation of voltage spikes, line noise, and transients.

1.0.7 Single phase transformers up to 100 KVA and three phase transformers up to 112.5 KVA shall terminate in copper bus bar.

1.0.8 Transformer coils must be wound with aluminum strip conductors for increased insulation life, cooler operation, and lower losses.

1.0.9 Transformers must operate at audible sound levels below NEMA Standard ST-20. Sound levels will not exceed the following:

30 - 50 KVA: 45 db

51 - 150 KVA: 50 db

151 - 300 KVA: 55 db

301 - 500 KVA: 60 db

501 - 750 KVA: 65 db

Transformers must incorporate vibration isolation pads in their construction located between the transformer core and coil assembly and the transformer case. External vibration isolation pads will not be used as they tend to increase audible noise. Transformers shall be floor mounted on a concrete pad. All connections to the transformer will be made by means of flexible metallic conduit.

1.0.10 Transformer enclosure shall be grounded per the National Electric Code.

1.0.11 Transformers shall be 60 Hz, 208, 240, 480 or 600 volts delta primary; 208Y/120, 240 delta or 480Y/277 secondary. KVA rating as indicated. Contractor to provide all necessary lugs for all transformers.

1.0.12 Complete shop drawings must be submitted for approval on all dry type transformers.

1.0.13 Typical performance data must be submitted for approval on all transformers. Factory tests must be made in accordance with the latest revisions of ANSI Test Code C57.12.91 for Dry Type Transformers. Performance data provided must contain but not be limited to:

(a) No load losses.

(b) Full load losses.

(c) Polarity and phase rotation.

(d) Impedance at reference temperature.

(e) Efficiencies at 25, 50, 75, and 100% load.

(f) Regulation at 100% and 80% power factor.

(g) Audible sound level.

(h) Dimensions and weight.

(i) Applied potential test.

(j) Induced potential test.

(k) Excitation current.

(l) IP, IX, and IZ percentages.

(m) Reference and ambient temperature.

1.0.14 Warranty: Transformers must be warranted against defects in materials, workmanship, and performance for ten years from date of manufacture.

Contact us and our support team at Tower at 510-490-2187 to get your quote, place your order and arrange for shipping.

Wide Variety of  Power Transformers

We Supply Wide Variety of High Quality Power Transformer Models

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power transformers - call 510-490-2187

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