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G e n e r a l Specifications
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(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) IR, 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.
(i) Applied potential test.
(j) Induced potential test.
(k) Excitation current.
(l) IR, 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.
SPECIFICATION GUIDE FOR SINGLE AND THREE PHASE ENCAPSULATED TRANSFORMERS
1.0 Dry Type Transformers:
1.0.0 The following information should be utilized only by trained technical personnel. If you need assistance, please contact
Acme’s Technical Services Department at 800-334-5214.
1.0.1 Provide dry type, enclosed, epoxy encapsulated transformers as indicated and specified herein. Transformers must be
Acme or approved equal.
1.0.2 Transformersmust be designed, constructed and rated in accordance with UL, CSA, NEMA, ANSI, IEEE, andOSHA standards.
1.0.3 Transformers 3.0 - 75 kVA shall be compound filled, incorporating a 180 degree C insulation system and designed not
to exceed a 115 degree C temperature rise above a 40 degree C ambient under full load conditions. Taps are to be pro-
vided on the primary side of the transformer. The catalog number suffix will provide the tap information outlined below:
SUFFIX TAP ARRANGEMENT
- 1S 2-5% BNFC
- 2S 1-5% ANFC & 1-5% BNFC
- 3S 2-2.5% ANFC & 4-2.5% BNFC
- 4S 2-2.5% ANFC & 2-2.5% BNFC
- 5S 2-5% ANFC & 2-5% BNFC
1.0.4 Transformer enclosure finish must be ASA 61 gray powder polyurethane paint.
1.0.5 Transformer enclosure temperature shall not exceed 65 degrees C plus the ambient.
1.0.6 Transformer enclosure shall be UL/NEMA Type 3R and so marked on the transformer.
1.0.7 Transformer shall incorporate an electrostatic shield for the attenuation of voltage spikes, line noise and transients.
1.0.8 Transformer coils are typically wound with aluminum or copper for increased insulation life, cooler operation and lower
losses.
1.0.9 All primary tap connections and both primary and secondary phase conductors must be either copper wire or copper
bus bar.