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Power or Watt Transducer | Selecting and Using Transducers for the Measurement of Electric, Power, Voltage, and Current

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May 31, 2016

What is a power or watt transducer? A watt, or power transducer, measures true electrical power delivered to a load, and converts that measurement to a DC voltage or current signal proportional to the power measured.

To measure power, the watt transducer must monitor both the voltage and current in a circuit. Further, it must be able to accurately determine the phase relationship between the voltage and current. This is the angle by which the current leads or lags the voltage. This measurement is very important to accurately determine true power.

What Type of Power Transducer to use?

  • Analog watt transducers, including Hall effect, provide good accuracy even with distorted wave shapes, discontinuity, or where there is poor frequency regulation.
  • Electronic watt transducers with sampling, or pulse-width, pulse-height type multipliers, provide excellent accuracy but may have problems with discontinuity or where there is poor frequency regulation.

Before ordering watt transducers it is to your advantage to assess your specific needs and conditions, then check with your sales representative at Ohio Semitronics, Inc. if you have any questions.

Three-Phase Power Transducers

Most motors in industry are three-phase, three-wire motors. These require two-element watt transducers. Do not attempt to save money and use a single element transducer- it will not provide correct or useful information. Smaller three-phase motors may be connected directly to the watt transducer. Larger three-phase motors will require the use of current and/or potential transformers.

GW5 Watt Transducer GW5 Watt Transducer

Interested in reading the entire Selecting and Using Transducers for the Measurement of Electric, Power, Voltage, and Current document? (Click here)



Need more help selecting the best and most accurate power measurement tool for your project? Call Ohio Semitronics, Inc. today, 1-800-537-6732
sales@ohiosemitronics.com