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Power Metering Fundamentals (PDF) This paper defines how to measure electrical energy using electronic wattmeters, for both single phase and multiphase applications for Power Monitoring while Utility grade measurement for revenue is left for others. Historical and current electronic measurement connections are shown. Included are multiphase transformer characteristics that to go from Wye to Delta and Delta to Wye configurations. Several multiphase electrical power measurement techniques using a three wattmeter approach will be compared to a two wattmeter approach along with some inaccuracies. A three wattmeter approach is presented as an accurate method for both balanced and unbalanced multiphase load conditions. The next section discusses the third order harmonic cancellations that occur when transferring between a Delta to Wye or from a Wye to Delta transformer for utility power transmissions. The final section describes using the CRD5463PM to obtain additional data like THD.