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UBC Theses and Dissertations

Statistical watthour meter operating by polarity-coincidence correlation Warman, Lloyd Alfred


A digital statistical watthour meter which operates by polarity-coincidence correlation is proposed. The output represents a continuously 'up-dated', time-multiplied estimate of the current and voltage cross-correlation function for zero delay. In previous correlators of this type, bounded uniformly-distributed random noise has been added to each input before clipping to linearize the input/output correlation function relationship. In the work reported here, the noise sources have been replaced by deterministic triangular wave generators. These have the advantage of being much simpler to construct and of enabling the statistical watthour meter to produce an acceptable estimate of the energy (for certain types of inputs) more quickly than with the former type of auxiliary function generator. An attempt has been made to predict the performance of the device using deterministic auxiliary functions by means of both analogue and digital computer simulations„ A prototype has also been constructed and tested with d-c and a-c inputs. The results of the simulations and prototype tests suggest that, if the meter electronics were refined and constructed for the most part as an integrated circuit, the statistical watthour meter could become a practical energy-measuring device in domestic, industrial and laboratory applications.

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