AAA Acme General Electrical
Power Transformer Distribution
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Non-Linear Transformers

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transformer guide
transformer guide



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

Non-Linear Transformers

1.0 Dry Type transformers:

1.0.1 Provide dry type, enclosed, and ventilated transformers as indicated and specified herein. Transformers must be Acme Transformer or approved equal. Transformers must be UL listed for non-sinusoidal current loads of a specified K Factor (UL Standard 1561), CSA certified and labeled as such.

1.0.2 For sizes 15 KVA and larger, low voltage dry transformers will be 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 will be provided on the primary side of the transformer. There will be 2, 2.5% taps above normal full capacity and 4, 2.5% taps 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 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 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.

1.0.3 Transformers shall incorporate an electrostatic shield for the attenuation of voltage spikes, fine noise, and transients.

1.0.4 Transformers must be designed to handle non-linear loads and the adverse effects of harmonics. Transformer coils will be wound with foil to minimize the heating effects caused by harmonic currents.

1.0.5 Transformers must be able to power non-linear loads with a K-Factor as high as 20.

1.0.6 Transformers must operate at audible sound levels below NEMA 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(*)

(*) Sound levels are based on transformers with a K-Factor of 4 and a temperature rise of 150 degrees centigrade.

Enclosed, Ventilated transformers must incorporate vibration dampening pads in their construction, located between the transformer core and coil assembly and the transformer case. External vibration dampening pads will not be used on enclosed, ventilated designs as they tend to increase audible noise. Transformers 15 KVA and larger shall be floor mounted on a concrete pad. All connections to the transformer will be made by means of flexible metallic conduit.

1.0.7 Transformers shall incorporate a neutral conductor sized at 2 times rated phase current. Transformer cases shall be grounded per the National Electric Code.

1.0.8 Transformers shall be 60 Hz, 480 or 600 volts delta primary, 208Y/120 volt secondary. KVA rating as indicated. Contractor to provide all necessary lugs for all transformers. Transformer enclosures shall be Type 2 and UL-3R listed with the addition of a weather shield.

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

1.0.10 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 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, 75, 50 and 100% load.

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

(g) Audible sound level.

(h) Insulation class and rated temperature rise.

(i) Dimensions and weight.

(j) Applied potential test.

(k) Induced potential test.

(l) Excitation current.

(m) IR, IX, and IZ percentages.

(n) Reference and ambient temperature.

1.0.11 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.

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