GENERAL
ELECTRICAL CONNECTION DIAGRAMS
ACME ELECTRIC
•
MILWAUKEE, WI
•
800.334.5214
•
acmetransformer.com
136
ACME
®
TR NSF RMER
™
SPECIFIC TIONS
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
Transformers must be designed, constructed and
rated in accordance with UL, CSA, NEMA, ANSI, IEEE,
and OSHA 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 provided 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.
1.0.10
Transformers must operate at audible sound levels
below ANSI/NEMA Standard ST-20. Sound levels will
not exceed the following:
Up to 9 kVA 40 db
10 - 50 kVA
45 db
51 - 150 kVA 50 db
1.0.11
Transformer enclosures shall be grounded per the
National Electric Code.
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 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, 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.
1.0.14
Warranty: Transformer must be warranted against
defects in materials, workmanship and performance
for ten years from date of manufacture.
Specification Guide for Single & Three Phase
Encapsulated Transformers
