Research on a non-contact watt-hour meter calibration device
To tackle challenges like congested wiring and confined spaces in watt-hour meter cali-bration,this paper introduces a novel non-contact calibration apparatus.Integrating both voltage and current measurements,it employs non-invasive voltage sensing,with the voltage signals undergoing pre-cise amplification,active filtering,and phase compensation before being fed into a high-performance HLW8032 energy metering IC for efficient data handling.The design innovation lies in the voltage meas-urement probe,ingeniously marrying a wire clamp with a conductive sponge.This design ensures intimate contact with wires,stabilizing coupling capacitance and ingeniously mitigating measurement errors from variable capacitance through intelligent external capacitor adjustments.Furthermore,the adoption of a compact U-shaped current clamp with a narrow opening is tailored for spatially restrictive environments,significantly enhancing the ease and agility of current sampling.A SCM control system oversees the real-time acquisition and processing of voltage,current,and power parameters,ensuring immediate display of measurement results.This not only bolsters the device's intelligence but also enriches the user's opera-tional experience.The prototype test verifies that the non-contact watt-hour meter calibration device can improve the safety and operational convenience of on-site calibration,and the measurement is less than 1.5%,which provides an efficient and reliable modern tool for on-site calibration of electric ener-gy measurement.
watt-hour meternon-contact measurementcoupling capacitanceU-type small opening current clamp