Patent ID: 11906552
Assignee: DIGITAL GRID RES. INST., CHINA SOUTHERN PWR. GRID
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 12:
13. A non-transitory computer-readable storage medium storing computer programs, wherein the computer programs, when executed by a processor, causes the processor to:
determine, by a voltage measuring device when the voltage measuring device is electrically coupled to a three-phase conductor through a voltage dividing capacitor in the voltage measuring device, a current measured voltage, the measured voltage being determined by measuring a voltage of the voltage dividing capacitor in the voltage measuring device, the voltage dividing capacitor being powered by a reference AC power supply, the voltage of the voltage dividing capacitor being related to voltages of three phase conductors and coupling capacitances between the voltage dividing capacitor and the three phase conductors; the measured voltage being determined, under an effect of different frequencies of the reference AC power supply and voltages of the three phase conductors, based on a sum of the voltage of the phase conductor to be measured and an interference voltage caused by conductors in the three-phase conductor other than the phase conductor to be measured, wherein the interference voltage varies linearly with change of the coupling capacitances, and the phase conductor to be measured is one of the three phase conductors;
adjust the coupling capacitances, and determine, by the voltage measuring device after the adjustment of the coupling capacitances, a current measured voltage;
acquire a first phase voltage value and a first phase angle of the measured voltage by the voltage measuring device before the adjustment of the coupling capacitances, and acquire a second phase voltage value and a second phase angle of the measured voltage by the voltage measuring device after the adjustment of the coupling capacitances; the first phase angle and the second phase angle being each an angle between the corresponding measured voltage and the voltage of the phase conductor to be measured; and
determine, based on the first phase voltage value, the first phase angle, the second phase voltage value and the second phase angle, the voltage of the phase conductor to be measured in the case that the interference voltage varies linearly with the change of the coupling capacitances.