Find electric transformers including electrical transformers, custom transformers, general electric transformers and more. From electric power transformers and alternator transformers to inverters, you will find the electric transformer you need. Use the time-saving Request for Quote tool to submit your inquiry to all the electric transformer suppliers and manufacturers you select.
Johnson Electric Coil is a complete manufacturer of electric transformers and power transformers for many industries. Some transformers include custom, power, isolation, toroidal and current transformers. We are proud of our excellence in customer service, support and quality products.
Epco Products offers fast and personal service for all of your power transformer and inductor applications. Serving OEMs since 1949 in the manufacture of high-quality and reliable isolation transformers, auto transformers, inductors, reactors and chokes for commercial and military.
Bicron Electronics specializes in high efficiency toroidal transformers up to 10KVA with safety recognitions from UL, CSA, VDE, TUV and IEC as well as high frequency transformers up to 10MHz for isolation, gate drive, pulse and switch mode functions. Bicron is ISO 9001:2000 certified.
Since 1956, Powertran has specialized in the design and manufacture of electric transformers. We have a range of products from shielded general purpose and isolation transformers to enclosed industrial control transformers. To learn more about us, please log on to our website or give us a call.
ISO 9001:2000 registered Sun Transformer creates custom transformers optimized for the needs of many industries. Large power, isolation & auto transformers, printed circuit mount power transformers, units for hostile conditions, units with ferrite or nickel cores for digital telecommunications use, etc.
Pacific Transformer (Pactran) is a leading manufacturer and supplier of custom electric transformers, power transformers, isolation transformers, dry type transformers, toroidal transformers and high voltage transformers that meet the highest standards for a wide range of industries.
Lenco specializes in a wide variety of custom transformers from Isolation transformers, Ferroresonant transformers, Autotransformers, Three-phase transformers and Inductors. Our success has not come about by accident, but by providing our customers with high-quality products.
TEMCo Transformer has been a manufacturer and distributor of electric transformers since 1968. We are a member of the Better Business Bureau and can provide you with high-voltage transformers, isolation transformers, low voltage transformer and many more. Custom voltage combinations are available!
The widest scope of any USA transformer company. We manufacture individual solutions: power transformers from 300KVA to 300MVA, such as liquid filled & dry type, encapsulated/harsh environment, automatic load tap changing, drive isolation, transit duty, generator step-up, auxiliary & station service.
With more than 30 years of experience, CMI designs, develops and manufactures power transformers, low and high voltage transformers and other magnetic products. We can also produce custom transformers. We offer just-in-time delivery, so call us today with your electric transformer needs.
In AC electrical systems, an electric transformer
converts voltage from one value to another. Electric transformers are
comprised of two sets of coils or windings linked by a magnetic field.
The coils are primary and secondary and function as conductors. When
the primary coil receives AC voltage, this produces a varying magnetic
field of voltage surrounding the conductor. The primary coil is responding
to the fluctuating current of AC voltage. The magnetic field activates
the secondary conductor coil. This results in the transformers changing
the voltage and transferring electrical energy, ideally with the least
amount of energy loss. The number of windings on each coil is important
as this determines the voltage that is conveyed from the primary to the
secondary through the magnetic field. The number of windings or turns
in the primary coil to the number of turns in the secondary coil determines
the magnitude of the voltage. The core is typically iron as this produces
the most efficient magnetic coil. Once the voltage conversion is made,
the energy is transferred to the load center and the electrical process
continues from there.
Electric transformers can also serve to isolate parts of circuits from
others. An electric transformer can be as large as the ones we see around
power lines or small enough to be tucked away in household appliances.
Electric transformers can also serve to convert as power adapters in
situations where there is a voltage difference between an electronic
component or appliance and an electrical power supply. There is a need
in AC electrical systems to continuously increase or lower the voltage
levels for efficiency and safety. Electric transformers provide for this
need marvelously since their operation is based on the fluctuating current
of AC voltage.
The incoming electric transformers voltage is an important factor. The
three common frequencies available are 50 Hz, 60Hz and 400 Hz. European
power is typically 50 Hz while North American power is usually 60hz.
The 400 Hz is reserved for high-powered applications such as aerospace
technologies. It is also important to consider the secondary power specifications
when evaluating transformers. Other specifications to keep in mind when
selecting an electric transformer are: the maximum ratings of the following:
secondary current and voltage rating, power and output rating. Power
transformers have various configurations according to phase and connections.
The most common phases are single-phase and three-phase. Both the size
and expense of electric transformers increases in proportion to the number
of primary windings.
Electric Transformers and
Electric Transformer Machines Image Provided by Lenco
Electronics, Inc.
Step Up Transformers are transformers that have a high voltage winding
connected to the output load and a low voltage winding connected
to the power source.
Toroidal transformers have copper wire around a cylindrical core
so the magnetic flux is contained.
Transformers are a static piece of apparatus
that transfers electrical energy from one circuit to another circuit
by electro-magnetic
induction, often with altered values of voltage and current.
Electric Transformers Terms
Air Cooled –
A transformer which uses air to cool by use of fans or normal ventilation.
Auto Transformer
– A transformer with one winding per phase.
Banked – Describes
multiple single phase transformers connected together to provide power
to a three phase load.
Core – The
transformer’s
central part or inductor that enhances the power of the magnetic field.
Core Saturation – A condition that results from a transformer or
inductor reaching highest magnetic strength.
Delta – In
a three phase connection the windings all connect to form a loop.
Duty Cycle – proportion
of time for a transformer to provide full rated power to the load. This
measurement greatly affects the actual size of the transformer.
Electrostatic Shielding – A component that sits between windings –typically
the primary and secondary – to supply the most isolation; more
of these can be placed between secondary windings as needed; it is normal
to connect the shielding to the core. Encapsulated - a dry transformer
with an enclosed core and coil assemble.
Exciting Current – The
amount of current a transformer draws at nominal voltage input in an
unloaded state.
Ferroresonance – Resonance results from the saturation of a ferrous
core of an inductive component, which increases the inductive reactance
relative to the capacitance reactance.
Filter – A complex system within the transformer that consists
of capacitors, inductors, and a resistor; it provides a relative small
opposition to specific frequencies or direct current, as it blocks or
attenuates other frequencies.
Flexible Connector
– A conductor that can handle thermal expansion and contraction
as well as reduce noise.
Impedance – That
the forces that resist the flow of current in AC circuits like resistance
or inductive or capacitive reactance.
Inductance – The capability of a coil for storing energy and resisting
changes in the flow of current; it is a function of the core material,
amount of turns of the coil and the cross section.
Inrush Current – This is when the transformer has a short
current surge through it, from residual flux, occurring at the moment
energy is applied to the transformer.
Isolation Transformer – This transformer has physical separation
from the primary and secondary windings in order to allow magnetic coupling
between isolated circuits and minimize electrostatic coupling.
KVA – Kilovolt
Ampere rating that is a measurement of the output of a transformer without
exceeding a certain temperature.
Load – The quantity of
electric power supplied or necessitated at any particular spot in the
system. Also a requirement of the KVA or
VA from the transformer; light bulbs are loads.
Magnetic Shielding – This conductive material attenuates stray
magnetic fields by its positioning around a transformer’s coils.
Polarity –
The direction of the current between two leads. If the directions are
the same then the leads have the same polarity. In electric transformers
the polarity is classes as either additive or subtractive.
Power Factor – Watts
divided by volt amps, KW divided by KVA. Power factor: leading and lagging
of voltage versus current caused by inductive or capacitive
loads, and harmonic power factor: from nonlinear current.
Rated Power – The total of the Volts and Amps derived from all
the secondary windings.
Reactance – This is the opposition to variations of alternating
current, capacitive reactance is in terms of capacitors, and inductive
reactance is the opposition to change from an inductor or coils.
Resonance – A condition of an AC circuit in which capacitive and
inductive reactances interact, resulting in a maximum or minimum circuit
impedance.
Secondary Winding
– On the load or output side, the connected transformer winding.
Sudden Pressure Relay
– Pressure switch device which detaches the transformer from the
line.
Voltage –
The measurement of the amount of force on a unit charge because of the
surrounding charges.
Voltage Regulation
– The change, in percentages, of the output voltage from no load
to full load.
Voltage Taps – Supplemental
connections to a winding which permit varying voltages from the same winding;
typically utilized on the primary winding to permit the transformer to
be used in different countries with varying line voltages
