Dry-type distribution transformers— general purpose … - 480v to 240v 3 phase transformer

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• (1) 480v to 240v transformer wiring
• (2) transformer 480 to 240 3 phase
• (3) step up transformer 240 to 480
• (4) 240v to 480v step up transformer

Design Guide DG009001EN Effective February 2020
Low-voltage power distribution and control systems >Transformers >
Dry-type distribution transformers--
general purpose
Contents
General Purpose Ventilated Transformers. . . . . . . . . . 19.1-2
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.1-2
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.1-3
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.1-10
General Purpose Ventilated Transformers
With Integral Breakers . . . . . . . . . . . . . . . . . . . . . . . . . 19.1-11
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.1-11
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.1-12
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.1-13
General Purpose Encapsulated Transformers. . . . . . . 19.1-14
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.1-14
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.1-15
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.1-20
Application Information. . . . . . . . . . . . . . . . . . . . . . . . 19.1-22
Transformer Selection . . . . . . . . . . . . . . . . . . . . . . . . . 19.1-22
Standards and Certifications . . . . . . . . . . . . . . . . . . . . 19.1-24
Glossary of Transformer Terms. . . . . . . . . . . . . . . . . . . 19.1-25
The Energy Policy Act of 2005. . . . . . . . . . . . . . . . . . . 19.1-28
Frequently Asked Questions About Transformers. . . . 19.1-29
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Dry-Type Distribution Transformers Design Guide DG009001EN
General Purpose Effective February 2020
General Purpose Ventilated Transformers 19.1-2
Overview Eaton's family of energy-efficient
ventilated transformers meets DOE 2016
efficiency requirements and federal energy
efficiency laws mandated by the Energy
Policy Act of 2005 and 10 CFR Part 431
(2016). Energy-efficient transformers are
especially designed to have low no-load
(core) losses; minimum efficiency
levels have been established for these
transformers when loaded at 35% of
their full load capacity. Available 600 V
distribution transformers installed in
the United States are required to meet
these energy efficiency requirements.
General purpose DOE 2016 transformers,
single-phase 15-100 kVA and three-phase
15-300 kVA, are manufactured in seismic
certified (including OSHPD) NEMAT Type 2
enclosures with optional weathershields
to make the enclosure NEMA 3R; wall
mounting is available up to 112.5 kVA
(1400 lb maximum weight). Coils are
wound with aluminum or copper
conductor and 220 ?C insulation materials.
The transformers are available with
temperature rise options of 150 ?C, 115 ?C
or 80 ?C, NEMA ST-20 audible sound levels,
and 60 or 50 Hz. Installation of energy-
efficient transformers may help facilities Wall-mounting capability up to 1400 lb
earn points toward LEEDT certification (equivalent to a typical 150 kVA three-
from the U.S. Green Building Council. phase ventilated transformer). Wall-
mounting kits WMB04 and WMB05 are
Note: Three-phase general purpose OSHPD certified
transformers are available with integral
circuit breakers to save installation time, Eaton voluntarily verifies the 2016
footprint, and reduce arc flash incident efficiencies with UL. Customers can
energy at downstream panel. be sure that Eaton-manufactured
transformers meet the DOE 2016
minimum required efficiencies.
EATON www.eaton.com
Dry-Type Distribution Transformers Design Guide DG009001EN
General Purpose Effective February 2020
General Purpose Ventilated Transformers 19.1-3
Technical Data Core and Coil Assemblies Taps
The transformer core is constructed using Primary taps are available on most
General Construction Features high-grade, non-aging, silicon steel with Eaton ventilated transformers to
high magnetic permeability, and low allow compensation for source
of General Purpose Ventilated hysteresis and eddy current losses. voltage variations.
Transformers Rated 600 V and below Maximum magnetic flux densities are
Eaton's single-phase and three-phase
substantially below the saturation point.
general purpose dry-type ventilated
The transformer core volume allows for Winding Terminations
transformers are of the two-winding
efficient transformer operation at 10% Primary and secondary windings are
type, self-cooled, and are available in a
above the nominal tap voltage.The core terminated in the wiring compartment.
wide variety of primary and secondary
laminations are tightly clamped and Encapsulated units have copper leads
voltage combinations.
compressed. Coils are wound of electrical or stabs brought out for connections.
grade aluminum or copper, and are of Ventilated transformers have leads
Eaton's transformers are designed, continuous wound construction.The BIL brought out to aluminum or copper pads
manufactured and tested in accordance (basic impulse level) for all 600 V-class that are pre-drilled to accept Cu/Al lugs.
with all of the latest applicable ANSI, windings is 10 kV.The core and coil Aluminum-wound transformers have
NEMA? and IEEE? standards. All 600 V assembly is installed on neoprene aluminum pads; copper-wound
class ventilated transformers with ratings vibration-absorbing pads. transformers have copper pads. Lugs are
through 1000 kVA are UL? listed and Ventilated transformers with wye- not supplied with Eaton transformers;
bear the UL label. Open core and coil connected secondaries have the neutral however, lug kits are available as
assemblies are UR labeled products. brought out to a separate XO terminal a field-installed accessory. Eaton
These transformers are designed for or busbar. recommends external cables be rated
90 ?C (sized at 75 ?C ampacity) for
continuous operation at rated kVA for The core and coil assembly is grounded encapsulated designs and rated 75 ?C
24 hours a day, 365 days a year, with to the transformer enclosure by means of for ventilated designs.
normal life expectancy as defined a visible flexible copper ground strap.The
in ANSI C57.96. copper ground strap is sized per the NEC
Efficiency validation: Eaton-manufactured to be a grounding conductor. Series-Multiple Windings
transformers in compliance with 10 CFR Eaton three-phase DOE 2016 efficient
Series-multiple windings consist of two
Part 431 (2016), "DOE 2016 efficient" bear transformers are provided with a bonding
similar coils in each winding that can be
the UL Energy Efficiency Verification Mark ground bar attached to the bottom panel
connected in series or parallel (multiple).
to confirm that the transformer meets the for compliance with NEC 450.10(A).
Transformers with series-multiple
energy efficiency requirements set forth windings are designated with an "x" or
in federal law 10 CFR Part 431. Transformer core and coil covered with a "/" between the voltage ratings, such
a fungus-resistant varnish to seal out as voltages of "240 x 480" or "120/240." If
Insulation System
moisture and other contaminants, and the series-multiple winding is designated
prevent the growth of fungus. by an "x," the winding can be connected
The design life of transformers having only in series or parallel. With a "/"
different insulation systems is the same; designation, a mid-point also becomes
the lower temperature systems are Electrostatic Shielding available in addition to the series or
designed for the same life as the higher There are no industry standards for parallel connection. As an example, a
temperature systems. electrostatic shield performance. Eaton- 240 x 480 winding can be connected for
Eaton ventilated transformers,
manufactured transformers have been either 240 (parallel) or 480 (series). A
regardless of their temperature rise,
tested by an independent laboratory to 120/240 winding can be connected for
are manufactured using a 220 ?C
meet the following attenuation levels: either 120 (parallel) or 240 (series), or
240 with a 120 mid-point.
insulation system. Required When tested per MIL-Std-220A, Method
performance is obtained without of Insertion Loss Measurement, with
exceeding the insulation system matched impedance no load technique:
rating at rated temperature rise in
a 40 ?C maximum ambient, with 1. Common mode noise attenuation:
an average ambient temperature Minus 80 dBA minimum at 0.1 kHz to
of 30 ?C over a 24-hour period. 1.5 kHz; minus 55 dBA minimum at
1.51 kHz to 100 kHz.
Transformers manufactured with 220C
insulation system meet the requirements 2. Normal mode (Transverse mode)
of NEC 450.21(b) Exception No.2. It is not noise attenuation: Minus 35 dBA
necessary to install them in a special, minimum at 1.5 kHz to 10 kHz.
fire-resistant room. Primary to Secondary Capacitance of
All insulation materials used are 24.74-18.06 picofarads on the range
flame-retardant and do not support 100-20 kHz.
combustion as defined in ASTM
StandardTest Method D635.
EATON www.eaton.com


How many AMPS is 480V? To calculate how many amps in 480 watts, divide watts by the voltage. 480 Watts to amps conversion is calculated based on current type AC/DC, current in watts, voltage type, voltage in volts, and power factor. How many amps in 480 watts? 480 watts equals 4.0000 amps with 120 volts DC. Watts to amps conversion table with 120 volts. 490 watts to amps

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