A Non-Contact Voltage Measurement Technology for Three-Phase Cables

This paper proposes a non-contact measurement technique for the voltage of three-phase cables. The technique initially constructs an optimized analytical calculation model for the electric field distribution of three-phase cables. Subsequently, by combining measured electric field data from an array-type capacitive sensor and utilizing the potential coefficient matrix obtained through physical calculations, it enables precise determination of the voltages on the three-phase conductors. The maximum error does not exceed 3.3%.