POWER ENGINEERING INDS. (PE) has been designing and manufacturing specialty transformers since 1963. The origins of these custom magnetic designs date back to the time when a need for unusually rated and cooled transformers was a necessity for the High Energy physics industry. It was also a time that new manufacturing materials had to be included in these very special designs. These designs spawned several generations of ever increasing complexity and ever increasing demands on existing materials as well as new materials, that would withstand higher temperatures, higher steel flux densities, higher dielectric strengths and many other demanding requirements.

Single Phase
Multi Phase
VA to MVA
Milli Amps to Kilo Amps
Volts to Kilo Volts

PE’s tenacity for not only keeping up with the technology demands, but also leading in the state-of-the-art products made PE the premier designer and manufacturer of specialty transformers in this country and the world. Following are but a few samples of vast array of transformer products for various industries that PE has been involved with:

• Rapid Transit
• Fusion Research
• Inverter Systems
• Power Supplies

• Substation transformers for rapid transit traction power systems. These units have been built in kVA sizes from 500 to 4000. Because of the unusual duty cycle demand of power at any given time these units have to operate with very demanding overloads while maintaining temperature limits, efficiencies, regulations and mechanical integrity. These transformers have been supplied to various authorities made with copper and aluminum conductors and they have been natural convection, oil or forced-air cooled. They have been designed for six pulse or twelve pulse operation. Input voltages have ranged from 480 to 34000. Because of the relatively low voltage of the output, secondary currents are usually in the thousands of Amps with multiples of those values for overloads.
  
  
• Locomotive power transformers. These transformers are on-board units to provide locomotive head in power. They must be light and be able to fit in unusual aspect ratio enclosures. They must be especially cooled sometimes by oil but most times by powerful fans.
  
  
• Auxiliary power transformers. These transformers are designed in a variety of sizes, inputs, outputs, frequencies, and cooling requirements. They are used to power auxiliary devices in rapid transit locomotives and cars.

• Rectifier Transformers. PE has designed rectifier transformers up to 15 MVA of power in voltages ranging from 250 Volts to 150,000 Volts and currents from 1000 Amps to 250,000 Amps. Cooling of these units has been through natural convection, natural oil, forced air, forced oil, SF6 and water. Also included are Filter inductors for dc power supply systems. Mostly of iron core design, these units have been designed to accommodate up to very high dc currents with superimposed ac currents.
  
  
• Transformers for experimental power supply units. The special characteristic of these units is that they have multiple input as well as multiple output connections to supply several combinations of output voltages and currents. Cooling is generally accomplished with direct water-cooled conductors sometimes in combination with forced-air. Cooling has also been successfully accomplished with SF6 gas.
  
  
• Interphase transformers. These transformers in most applications are manufactured rather routinely. In the fusion research industry, however they present some very unusual challenges. From exotic cooling arrangements to multiple gaps to extremely rugged mechanical construction to dual outputs, these units require very special design and construction attention