18 pulse transformer
autotransformer phasor

18-Pulse Autotransformer | 150 HP Rating | P23811

Reduce harmonic distortions for long-lasting VFDs

HP Rating

150

kVA

149

Part Number

P23811

SNC’s 18-pulse autotransformer is a heavy-duty, multi-phase transformer designed to effectively reduce harmonic distortion for variable frequency drive applications.

A variable frequency drive (VFD) is a type of motor controller that varies a motor’s frequency and supplied voltage in order to produce energy savings and greater efficiency.

Harmonic distortion can be detrimental operation of the VFD and induce conductor and motor degradation. To ensure safe and reliable VFD operation, an 18-pulse autotransformer converts the disrupted raw power from a diesel engine into a wavelength that’s as pure as possible. A smooth wavelength, free of interruptions, results in a clean, reliable motor drive.

VFDs, and therefore 18-pulse autotransformers, are commonly purposed in applications with large drive motors requiring variable speed with variable torque, such as pumps, machine tools, blowers, conveyer systems, A/C motors and more. Industries range from mining to steel mills to marine and more.

What is an 18-pulse autotransformer?

Regardless of the industry or application, an 18-pulse autotransformer is a three-phase transformer that acts as a voltage regulator and is designed to continuously generate electrical pulses of constant amplitude and great velocity.

SNC’s 18-pulse autotransformer is a light, compact unit that offers a smaller footprint. Available with or without an enclosure, our rugged 18-pulse autotransformer also provides multiple aluminum busbar termination options in various sizes to meet your specific application requirements.

Product features

  • 3-phase, 480V primary and 427V secondary
  • 60 Hz
  • 50 to 500 horsepower ratings
  • ETL UL 1561 certified
  • Aluminum windings (While SNC uses aluminum windings and busbars to save on manufacturing costs, a lighter-weight transformer with copper windings and busbars are available upon request.)
  • 180°C (356°F) for better insulation
  • Thermal switches, which are normally closed as an added safety measure
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