Abstract
In the study the methodology for evaluation of the total harmonics additional electrical power and energy measurement error caused by usage of instrument transformers in the measuring system for transformation of distorted current/voltage is discussed. In order to avoid the need for accurate measure of phase angles of distorted current/voltage higher harmonics the percentage components of the composite error, caused by current/voltage transformer's phase displacements, may be calculated. Moreover, the factor to determine the impact of change of voltage and current transformers’ accuracy of distorted current/voltage transformation in relation to sinusoidal conditions on power and energy measurement error is proposed. Finally, it has been shown that current and voltage distortion does not necessarily mean an increase of measuring system additional measurement error of total active power caused by usage of inductive instrument transformers.
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