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Since its founding by Lawrence Johnson in 1934, the Johnson Electric Coil Co. has prided itself on being a family owned and operated manufacturer committed to making the finest power transformers with American labor. Johnson is proud of its heritage and committed to maintaining the commitments made by Lawrence to care about its people, customers and products at the highest level.
With Glen Magnetics you get the proven experience of both designers and manufacturers of custom power transformers. This company works with you to provide high quality, cost-effective transformer solutions. With expertise built on more than 30 years in the industry, customers rely on Glen Magnetics to supply exactly what they need, when they need it, 100% tested, with no hassles.
Triad Magnetics' pioneering design process promotes innovation and there are thousands of Triad designs providing application solutions throughout the world. Triad's talented engineers are experienced in a wide range of services, which is revealed and appreciated in Triad's precision manufactured power transformers. Please call Triad today or go to their website for more information.
We are among the largest US custom transformer manufacturers with products including inductors, high-power switching transformers, high-power 3-phase inverters/converters, toroidal transformers. We serve electronic, medical, military, industrial, standby power and telecommunication markets.
Supplying quality power transformers since 1973, Lenco has shown steady growth, both financially & in plant space & today their state of the art manufacturing facility measures approximately 22,000 sq.ft. with an additional 10,000 sq. ft. manufacturing facility in Mexico. Lenco is proud of its experienced, 85 member staff, over 50 percent of which have 10 or more years vested with Lenco.
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.
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Industry Information
View A Video on Power Transformers - A Quick Introduction
Power Transformers
When power is generated at a power plant, it is transmitted through a very high voltage line; the voltage of such high capacity lines can be as high as several hundred thousand volts. From there, the high voltage lines are directed to power substations. A power substation involves several transformers that reduce to voltage to a few thousand volts; this number is usually around 7,000 volts. The substation outputs its voltage throughout several transmission lines, each of which transmits its own 7,000 volts. These transmission lines end at another kind of transformer; these transformers are often mounted on utility poles outside homes and places of business. It is from these comparatively small transformers that the appropriate voltage for use in homes and places of business is distributed. By the time the voltage from this transformer reaches an individual power outlet, it usually ranges between 120 and 220 volts (in the United States and some other countries).
Power transformers are used primarily to couple electrical energy from a power supply line to a circuit system. They provide the power source for all of the electronic devices used in homes and places of business. There are many variations among power transformers. Power transformers may be dry-type or cast coil design and be pole-mounted, pad-mounted, or wall-mounted. They can have 3R or 4 enclosures. Power transformers are also available with aluminum or copper windings. Some considerations for the choice of a power transformer include the voltage that is available, the voltage load required for equipment, current and future KVA load, Hz frequency, single or three phase needs, auto or double winding, mounting configuration and whether the transformer will be used indoors or outdoors. Transformers can also be used to manage the currents transmitted through underground power lines. They are necessary for the safe and effective function of the largest and smallest electronic devices in industry, commerce and in consumer products contexts.
