Precision Transducers for Laboratory Measurements of Power and Power Quality

The emphasis on the design of transducers mostly focusses on minimizing their magnitude error. For power measurements and waveform metrology, the phase error of transducers, and the way in which it varies over the bandwidth of interest, is as important as the amplitude response.The characterization of transducers to account for phase involves impedance measurements, especially at low impedance values.

Coordinator: Paul Wright

An essential part of alternate current measurements is the scaling of signal levels. It is often necessary to convert current and voltage from working levels to a value convenient for the input of a digitiser, typically between 1 V and 10 V. The transducers used for this scaling operation must have characteristics that are stable and insensitive to temperature and signal level. As the signals of interest are typically complex in nature, this scaling operation must be carried out with a known amplitude and phase response over the frequency range in question.    

The emphasis on the design of these devices mostly focusses on minimizing their magnitude error.  For power measurements and waveform metrology, the phase error of transducers, and the way in which it varies over the bandwidth of interest, is as important as the amplitude response.  The characterization of transducers to account for phase involves impedance measurements, especially at low impedance values (<1 ohm) typically needed for shunts. 

This project provided the necessary transducers beyond the state-of-the-art, of sufficient bandwidth and precision, complementing the range of digitisers also proposed in the project such that the needs of laboratory-based power quality traceably can be met. 

For more information, see  the project webpage >>