GENERAL
ELECTRICAL CONNECTION DIAGRAMS
ACME ELECTRIC
•
MILWAUKEE, WI
•
800.334.5214
•
acmetransformer.com
138
ACME
®
TR NSF RMER
™
SPECIFIC TIONS
1.0.9
Transformers must operate at audible sound levels
below NEMA standard ST-20. Sound levels will not
exceed the following:
up to 9kVA
40 db
10 - 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, (27 -
750 kVA).
External vibration pads should 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 Electrical Code.
1.0.11
Transformer voltages shall be as follows:
(a)
460 Delta - 460Y/266
(b)
460 Delta - 230Y/133
(c)
575 Delta - 230Y/133
(d)
575 Delta - 460Y/266
(e)
230 Delta-230Y/133
(f)
Other
Transformer shall be 60 Hz. 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, 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.
1.0.14
Warranty: Transformers must be warranted against
defects in materials, workmanship and performance for
ten years from date of manufacture.
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 shall be designed for use with AC/DC
Drive applications and labeled as such.
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 7.5 - 20 kVA shall be three phase,
compound filled, incorporating a 180 degree C insula-
tion system and designed not to exceed a 115 degree C
temperature rise above a 40 degree C ambient under full
load conditions. Taps are provided on the primary side of
the transformer as follows:
(a)
1-5% above normal full capacity.
(b)
1-5% below normal full capacity.
Transformers 27 - 750 kVA shall be the ventilated type,
incorporating a 220 degree C insulation system and
designed not to exceed a 150 degree C temperature rise
above a 40 degree C maximum 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.
(b)
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 a 115 degree C temperature rise
above a 40 degree C maximum ambient under full load
conditions.
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 maximum ambient under full
load conditions.
1.0.4
Transformer enclosure finish must be ASA 61 gray powder
polyurethane paint. Ventilated transformer enclosure
temperature shall not exceed 50 degrees C plus the ambient.
Compound filled transformer enclosure temperature shall not
exceed 65 degrees C, plus the ambient.
1.0.5
Compound filled transformer enclosure shall be UL/
NEMA Type 3R and so marked on the transformer
(7.5 - 20 kVA). No weather shield is required. Ventilated
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 (27 - 750 kVA).
1.0.6
Transformers shall incorporate an electrostatic shield for
the attenuation of voltage spikes, line noise, and tran-
sients.
1.0.7
Transformers up to 220 kVA shall terminate in copper bus
bar or copper wire.
1.0.8
Transformer coils must be wound with aluminum strip
conductors for increased insulation life, cooler operation
and lower losses.
Specification Guide for Drive Isolation Transformers
