Teridian™ Metering ICs in the Presence of Harmonics and Interharmonics

Abstract: The electricity grid can be contaminated by nonlinear loads that introduce harmonics and interharmonics into the currents and voltages measured by electricity meters. This scenario is believed to be detrimental to the accuracy of solid-state electricity meters. It has been argued that meters using ICs with relatively low sampling frequencies and sequential sampling are prone to inaccuracies in the presence of harmonics and interharmonics. This application note investigates claims about inaccuracy in the presence of current and voltage harmonics and interharmonics and proves these claims to be misleading and exaggerated.

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