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Temporary Rental Spot Mobil Portable Transfer Switches, Transformers and Power Conditioners

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  • Automatic transfer switches for redundancy in power
  • Transformers to provide multiple voltage options
  • Power conditioners for sensitive electronic apparatus
AmeriTemp step down transformers provide multiple 208V 3-phase power connections from a 480V 3-phase power source, making them ideal for powering portable distribution panels in a wide range of industrial applications. AmeriTemp offers several sizes of step-down transformers from 75 kVA to 225 kVA.

​
  • Input:     480V 3-phase
  • Output:   Multiple 208V 3-phase connections using 5-wire sets of cam-type output receptacles

Federal Pacific 3 Phase ventilated dry-type transformers

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Model
Capacity
Power Input
Power Output
Weight
AT30 30 kVA 36 amp, 480V 3 phase 83 amp, 208V 2 phase 465
AT45 45 kVA 54 amp 480V 3 phase 124 amp, 208V 3 phase 580
AT75 75 kVA 113 amp, 480V 3 phase 208 amp, 208V 2 phase 1000
AT150 150 kVA 181 amp, 480V 3 phase 417 amp, 208V 3 phase 1250
AT225 225 kVA 271 amp, 480V 3 phase 625 amp, 208V 3 phase 1425

Transformer Glossary

Air Cooled
A transformer which uses air as the
cooling method medium. Term is
abbreviated with the ANSI designation
AA indicating open, natural draft ventilated
construction.
Ambient Noise Level
The inherent or existing noise level
of the surrounding area measured
in decibels.
Ambient Temperature
The inherent or existing temperature
of surrounding atmosphere into which
the heat of a transformer is dissipated.
Transformers are designed for 30°C
average ambient temperature with
a 40° C maximum during any 24
hour period.
Ampere
A unit of electric current flow.
ANSI
American National Standards Institute,
Inc.– a recognized organization which
specifies the standards for transformers.
ASTM
American Society for Testing Materials.
ATC
Air Terminal Chamber. See Terminal
Chamber.
Attenuation
A term used to denote a decrease in
magnitude in transmission from one
point to another. Typically expressed as
a ratio or in decibels, as in electrical
noise attenuation.
Autotransformer
A transformer with one winding per
phase in which part of the winding is
common to both the primary and the
secondary circuits.
Banked
Two or more single phase transformers
connected together to supply a three
phase load.
BIL
Basic Impulse Level measures the ability
of the insulation system to withstand
high voltage surges.
Buck-Boost
Small KVA, two-winding transformers
typically wired as an autotransformer
to raise or lower single and three phase
line voltages by 10 - 20%.
Cast Coil Transformer
Transformer with coils solidly case in
epoxy resin under vacuum in a mold.
Also called cast resin or epoxy cast coil
transformer.
Center Tap
A reduced capacity tap at the midpoint
in a winding. Also referred to
as lighting tap.
Certified Test
Actual values taken during production
testing which certify the values or
results or testing to apply to a specific
unit.
Coil
Turns of electrical grade wire or strip
conductor material wound on a form;
often referred to as winding.
Common Mode
Electrical noise or voltage disturbance
that occurs between one of the line
leads and the common ground, or
between the ground plane and either
the line or the neutral.
Compensated Transformer
A transformer with a turns ratio which
provides a higher than rated voltage at
no load and rated voltage at rated load.
Such transformers cannot be used for
reverse feed.
Conductor Losses
Losses in watts caused by the resistance
of the transformer winding during
a loaded condition. Also referred to as
load loss or winding loss.
Continuous Rating
The constant load which a transformer
can maintain indefinitely, at rated voltage
and frequency, without exceeding
its designed temperature rise.
Control Transformer
A transformer designed to provide good
voltage regulation for control or instrumentation
circuits having high inrush
current or low power factor conditions.
Copper Loss
See load loss.
Core
Electrical grade steel laminations which
carries the magnetic flux.
Core Loss
Losses in watts caused by magnetization
of the core and its resistance
to magnetic flux when excited or
energized at rated voltage and
frequency. Also referred to as
excitation loss or no-load loss.
Current Transformer
Transformer generally used in control
or instrumentation circuits for measuring
current.
Decibel (dB)
A standard unit of measure of intensity.
Delta
A standard three phase connection
with the ends of each phase winding
connected in series to form a loop with
each phase 120 degrees from each
other. Also referred to as 3-wire.
Delta-Wye
A term or symbol indicating the primary
connected in delta and the secondary
in wye when pertaining to a three
phase transformer or transformer bank.
Dielectric Tests
A series of tests conducted to verify
effectiveness of insulation materials
and clearances used between turns
and layers in the winding.
Distribution Transformer
Generally referred to as any transformer
rated 500 KVA and below, except for
current, potential, or other specialty
transformers.
Dry Type
A transformer without liquid for cooling.
Dual Winding
A winding consisting of two separate
parts which can be connected in series
or in parallel. Also referred to as dual
voltage or series multiple winding.
Glossary
Electrostatic Shield
Conductor material placed between the
primary and secondary windings which
is grounded to reduce electrical noise or
line interference.
Exciting Current
“No-load current” flowing in the
winding used to excite the transformer
when all other windings are open--
circuited. Usually expressed in percent
of the rated current of a winding in
which it is measured.
Encapsulated
Transformer with coils either encased
or cast in an epoxy resin or other encapsulating
materials.
FCAN
“Full Capacity Above Normal.” A
designation for no-load taps indicating
the taps are suitable for full-rated KVA
at the designated voltages above
nominal voltage.
FCBN
Same as above except Full Capacity
Below Normal.
Fan Cooled
Cooled mechanically to maintain rated
temperature rise, typically using auxiliary
fans to accelerate heat dissipation.
Flexible Connection
A non-rigid connection used to eliminate
transmission of noise and vibration.
Frequency
Designates the number of times, or
complete cycles, that polarity alternates
from positive to negative per unit of
time; as in 60 cycles per second. Also
referred to as Hertz.
Full Capacity Tap
Tap than can deliver rated KVA without
exceeding its designated temperature
rise.
Grounding Transformer
A special 3 phase autotransformer used
to establish a stable neutral point on a
3-wire delta system. Also referred to as
Zig-Zag transformer.
Grounding
Connecting one side of a circuit to
earth; or creating a conducting path to
some conducting body that serves in
place of earth through low-resistance or
low-impedance paths.
Hertz (Hz)
A term for AC frequency in cycles
per second.
High Voltage Winding
Designates the winding with the
greater voltage; designated as HV on
the nameplate and as H1, H2, etc. on
the termination.
Hi Pot
High potential dielectric test impressed
on the windings to check insulation
materials and clearances.
Impulse Tests
Dielectric test which determines BIL
capability by applying high frequency,
steep wave-front voltage between
windings and ground.
Impedance
Retarding or opposing forces of
current flow in AC circuit, expressed
in percentage.
Induced Potential Test
A high frequency dielectric test which
verifies the integrity of insulating
materials and electrical clearances
between turns and layers of a winding.
Inductance
A property which opposes a change in
current flow.
Inrush Current
Abnormally high current, caused by
residual flux in the core, which is
occasionally drawn when a transformer
is energized.
Insulating Transformer
One which the primary winding
connected to the input or source, is
insulated from the secondary winding
connected to the output or load. Also
referred to as two-winding or isolation
transformers, which isolate the primary
circuit from the secondary circuit.
Iron Loss
See No Load Loss or Core loss.
IR%
Percent resistance. Voltage drop due
to conductor resistance at rated current
expressed in percent of rated voltage
IX%
Percent reactance. Voltage drop due to
reactance at rated current expressed in
percent of rated voltage.
IZ%
Percent impedance. Voltage drop
due to impedance at rated current
expressed in percent of rated voltage.
KVA
Kilovolt ampere rating with designates
the capacity or output with a transformer
can deliver at rated voltage and
frequency without exceeding designed
temperature rise. (1 KVA = 1000VA, or
1000 volt amperes).
Lamination
Thin sheets of special steel used to
make the core of a transformer.
Liquid Transformer
A transformer which used mineral oil,
or other dielectric fluid, which serves
as an insulating and cooling medium.
Load Losses
Losses in watts which are the result
of current flowing to the load. Also
referred to as winding loss, copper loss,
or conductor loss.
Mid-tap
A reduced capacity tap midway in a
winding. Also referred to a Center tap;
usually in the secondary winding.
NEC
National Electric Code.
NEMA
National Electrical Manufacturers
Association.
No-load Loss
See core loss.
Oil Cooled
A transformer which uses oil as the
cooling medium. Term is abbreviated
with the ANSI designation OA indicating
natural oil ambient ventilation.
Parallel Operation
Transformers having compatible design
features with their appropriate terminals
connected together.
Phase
Classification of an AC circuit; typically
designated as single phase 2-wire or
3-wire, or three phase 3-wire or 4-wire.
Polarity
Designates the instantaneous direction
of the voltages in the primary compared
to the secondary.
Potential Transformer
A transformer generally used in instrumentation circuits for measuring or
controlling voltage.
Power Factor
The relation of watts to volt amps in
a circuit.
Primary Rating
The input, source, or supply side
connected to the primary of the
transformer in a circuit.
Rating
The design characteristics, such
as primary and secondary voltage,
KVA, capacity, temperature rise,
frequency, etc.
Ratio
Refers to the turns ratio or the voltage
ratio between the primary and secondary
winding.
Reactance
The effect of inductive and capacitive
components of a AC circuit producing
other than unity power factor.
Reactor
A single winding device with an air or
iron core which produces a specific
amount of inductive reactance into a
circuit, usually to reduce or control
current.
Reduced Capacity Taps
Taps which are rated for winding
current only (versus rated KVA), thus
reducing available power because of
lower output voltage.
Regulation
The percent change in secondary output
voltage when the load changes from full
load to no-load at a given power factor.
Scott Connection
A transformer connection generally
used to get a two phase output from
the secondary of a three phase input,
or vice versa.
Sealed Transformer
An enclosed transformer completely
sealed from the outside environment
and usually contains pressurized
inert gas.
Secondary Rating
The output, or load side connected
to the secondary of the transformer
in a circuit.
Series/Multiple
A winding consisting of two or more
sections which can be connected for
series operation or multiple (parallel)
operation. Also referred to as dual
voltage or series-parallel.
Star Connection
Same as wye connection.
Step-down Transformer
One in which the energy transfer is
from the high voltage winding (primary
input circuit) to the low voltage winding
(secondary output or load circuit).
Step-up Transformer
The energy transfer is from the low
voltage winding to the high voltage
winding; with the low voltage winding
connected to the power source (primary
input circuit) and the high voltage
connected to the load (secondary output
circuit).
T-connection
Use of Scott connection for three phase
operation using two primary (main) and
two secondary (teaser) coils.
Tap
A connection brought out of winding
at some point between its extremities
to permit changing the nominal voltage
ratio. Taps are usually located in the
high voltage winding, typically expressed
as FCAN and FCBN for no-load
operation.
Temperature Rise
The increase over ambient temperature
of the winding due to energizing and
loading the transformer; typically
measured as either average rise by
resistance or as hot-spot.
Terminal Chamber
An enclosure with space for making
connection to a substation transformer,
typically used when the transformer is
not direct connected or close coupled to
another device.
Total Losses
The transformer electrical losses which
include no-load losses (core loss) and
load losses (winding losses).
Turns Ratio
See Ratio.
Transformer
A static electrical device which by
electromagnetic induction transforms
energy at one voltage or current to
another at the same frequency.
Transformer Tests
Normal, routing production tests
include: (1) core loss (excitation loss
or non-load loss); (2) load loss –
winding or copper loss; (3) Impedance;
(4) Hi-pot – high voltage between
windings and ground; (5) Induced –
double induced two time normal
voltage. Optional special tests include:
(a) Heat Run – temperature testing;
(b) Noise tests – sound level measurement
(c) Impulse tests – BIL tests.
Transverse Mode
Electrical noise or voltage disturbance
that occurs between phase and neutral,
or from spurious signals across the
metallic hot line and the neutral
conductor.
UL
Underwriters Laboratories.
Voltage Ratio
See Ratio.
Voltage Regulation
The change in secondary voltage which
occurs when the load is reduced from
rated value to zero, with the values of
all other qualities remaining unchanged.
Regulation may be expressed in percent
(per unit) on the basis or rated
secondary voltage at full load.
Winding Losses
See Load Losses.
Wye Connection
A three phase connection with similar
ends of each phase connected together
at a common point which forms the
electrical neutral point which is typically
grounded.
Zig-Zag
Special transformer connection
commonly used with grounding
transformers. See also grounding
transformers.
AmeriTemp Group 24/7  Nationwide Service  800-579-7368
Free Small Parcel 70 lbs. or less UPS GROUND shipping on orders over $250 ​Use Coupon Code "SHIPFREE"
{LTL Freight is not included with Free Shipping Offer, 70lbs or large packages will ship LTL Freight} ​​
For expedited shipments please call (815) 385-2350​
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