Influence of Capacitive Leakage on Electric Energy Measurement with a Standard Meter Under Real-Load Conditions

When measuring electric energy under real-load conditions, the voltage applied to the current input of the standard meter introduces unwanted electric energy, especially at low currents. Experiment results showed that the voltage applied to the current input under real-load conditions produces capacitive leakage current through the distributed capacitance. The leakage current is added on the energy/power measuring circuit, which leads to errors in the measurement of the current amplitude and phase in low-current ranges.