Metering Error of electronic watt-hour mater.
Both of the above multipliers have input circuits and generally use transformer input, so each electronic watt-hour meter has radio error and angle error in voltage,current input voltage change coefficients Ku and Ki and the square multiplier has amplitude error and phase error in the transfer coefficient. As a result,an electronic watt-hour meter itself has many factor that may cause errors. Even if instrument initialization and calibration of standard constants are well conducted at delivery, error may also occur due to external interference in the operating environment, a change in the performance of internal transformers, and other random factors. Therefore, like a traditional electromechanical watt-hour meter, an electronic watt-hour meter may have random errors.