# US 11,906,552 B1 · Voltage measuring method, computer device and storage medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,906,552 B1 - Document ID: US11906552B1 - Status: Granted - Kind: B1 - Application number: 18/228,302 - Filed: 2023-07-31 - Granted: 2024-02-20 - Earliest claimed: 2022-09-30 - Assignees: Digital Grid Res Inst, China Southern Power Grid - Applicants: Digital Grid Res. Inst, China Southern Power Grid - Inventors: Peng Li; Bing Tian; Zhong Liu; Bofeng Luo; Zhiming Wang; Licheng Li; Xiaopeng Fan; Senjing Yao; Qiancheng Lv; Zhenheng Xu; Renze Chen; Yuehuan Lin; Xu Yin; Jiaming Zhang; Jie Wei; Zejie Tan - Web page: https://patentgrep.com/patent/US11906552B1 ## CPC - G01R 15/06: having reactive components, e.g. capacitive transformer - G01R 19/0084: {Measuring voltage only} - G01R 25/00: Arrangements for measuring phase angle between a voltage and a current or between voltages or currents - G01R 15/16: using capacitive devices - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract The present disclosure relates to a voltage measuring method, a computer device and a storage medium. The method includes: determining, 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; adjusting the coupling capacitances, and determining, by the voltage measuring device after the adjustment of the coupling capacitances, a current measured voltage; and determining, based on the measured voltage by the voltage measuring device before the adjustment of the coupling capacitances and the measured voltage by the voltage measuring device after the adjustment of the coupling capacitances, a voltage of a phase conductor of the three-phase conductor to be measured. ## Claims ### Claim 1 A voltage measuring method, comprising: determining, 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; adjusting the coupling capacitances, and determining, by the voltage measuring device after the adjustment of the coupling capacitances, a current measured voltage; acquiring 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 acquiring 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 determining, 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. ### Claim 2 (depends on 1) The voltage measuring method of claim 1, wherein the voltage measuring device further comprises a toggle switch, as well as a first electrode plate, a second electrode plate and a third electrode plate used to form the coupling capacitances, and the first electrode plate, the voltage dividing capacitor, the reference AC power supply, the second electrode plate, the toggle switch and the third electrode plate are connected sequentially, and wherein the adjusting the coupling capacitances comprises: changing a state of the toggle switch, and obtaining adjusted coupling capacitances after change of the state of the toggle switch, the state of the toggle switch comprising an open state or a closed state. ### Claim 3 (depends on 2) The voltage measuring method of claim 2, wherein the second electrode plate and the third electrode plate are not connected in the open state, and the second electrode plate and the third electrode plate are connected in the closed state. ### Claim 4 (depends on 1) The voltage measuring method of claim 1, wherein the determining the current measured voltage by the voltage measuring device comprises: determining a current voltage of the voltage dividing capacitor in the voltage measuring device; acquiring a preset voltage of the reference AC power supply in the voltage measuring device; and determining, based on the current voltage of the voltage dividing capacitor and the preset voltage of the reference AC power supply, the current measured voltage by the voltage measuring device. ### Claim 5 (depends on 4) The voltage measuring method of claim 4, wherein the determining the current voltage of the voltage dividing capacitor in the voltage measuring device comprises: acquiring a detected voltage of the voltage dividing capacitor in the voltage measuring device; the detected voltage being a voltage collected under a combined effect of the reference AC power supply and the voltages of the three phase conductors; and decomposing the detected voltage to obtain a first decomposition voltage of the voltage dividing capacitor under separate effect of the voltages of the three phase conductors at the frequency of the AC power supply, and a second decomposition voltage of the voltage dividing capacitor under separate effect of the reference AC power supply at the frequency of the reference AC power supply. ### Claim 6 (depends on 5) The voltage measuring method of claim 5, wherein the determining, based on the current voltage of the voltage dividing capacitor and the preset voltage of the reference AC power supply, the current measured voltage by the voltage measuring device comprises: acquiring a ratio of the first decomposition voltage to the second decomposition voltage; and obtaining, based on a product of the ratio and the preset voltage of the reference AC power supply, the current measured voltage by the voltage measuring device. ### Claim 7 A computer device comprising a processor and a memory storing computer programs, wherein the computer programs, when executed by the 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. ### Claim 8 (depends on 7) The computer device of claim 7, wherein the determining the current measured voltage by the voltage measuring device comprises: determining a current voltage of the voltage dividing capacitor in the voltage measuring device; acquiring a preset voltage of the reference AC power supply in the voltage measuring device; and determining, based on the current voltage of the voltage dividing capacitor and the preset voltage of the reference AC power supply, the current measured voltage by the voltage measuring device. ### Claim 9 (depends on 8) The computer device of claim 8, wherein the determining the current voltage of the voltage dividing capacitor in the voltage measuring device comprises: acquiring a detected voltage of the voltage dividing capacitor in the voltage measuring device; the detected voltage being a voltage collected under a combined effect of the reference AC power supply and the voltages of the three phase conductors; and decomposing the detected voltage to obtain a first decomposition voltage of the voltage dividing capacitor under separate effect of the voltages of the three phase conductors at the frequency of the AC power supply, and a second decomposition voltage of the voltage dividing capacitor under separate effect of the reference AC power supply at the frequency of the reference AC power supply. ### Claim 10 (depends on 9) The computer device of claim 9, wherein the determining, based on the current voltage of the voltage dividing capacitor and the preset voltage of the reference AC power supply, the current measured voltage by the voltage measuring device comprises: acquiring a ratio of the first decomposition voltage to the second decomposition voltage; and obtaining, based on a product of the ratio and the preset voltage of the reference AC power supply, the current measured voltage by the voltage measuring device. ### Claim 11 (depends on 7) The computer device of claim 7, wherein the voltage measuring device further comprises a toggle switch, as well as a first electrode plate, a second electrode plate and a third electrode plate used to form the coupling capacitances, and the first electrode plate, the voltage dividing capacitor, the reference AC power supply, the second electrode plate, the toggle switch and the third electrode plate are connected sequentially, and wherein the adjusting the coupling capacitances comprises: changing a state of the toggle switch, and obtaining adjusted coupling capacitances after change of the state of the toggle switch, the state of the toggle switch comprising an open state or a closed state. ### Claim 12 (depends on 11) The computer device of claim 11, wherein the second electrode plate and the third electrode plate are not connected in the open state, and the second electrode plate and the third electrode plate are connected in the closed state. ### Claim 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. ### Claim 14 (depends on 13) The non-transitory computer-readable storage medium of claim 13, wherein the determining the current measured voltage by the voltage measuring device comprises: determining a current voltage of the voltage dividing capacitor in the voltage measuring device; acquiring a preset voltage of the reference AC power supply in the voltage measuring device; and determining, based on the current voltage of the voltage dividing capacitor and the preset voltage of the reference AC power supply, the current measured voltage by the voltage measuring device. ### Claim 15 (depends on 14) The non-transitory computer-readable storage medium of claim 14, wherein the determining the current voltage of the voltage dividing capacitor in the voltage measuring device comprises: acquiring a detected voltage of the voltage dividing capacitor in the voltage measuring device; the detected voltage being a voltage collected under a combined effect of the reference AC power supply and the voltages of the three phase conductors; and decomposing the detected voltage to obtain a first decomposition voltage of the voltage dividing capacitor under separate effect of the voltages of the three phase conductors at the frequency of the AC power supply, and a second decomposition voltage of the voltage dividing capacitor under separate effect of the reference AC power supply at the frequency of the reference AC power supply. ### Claim 16 (depends on 15) The non-transitory computer-readable storage medium of claim 15, wherein the determining, based on the current voltage of the voltage dividing capacitor and the preset voltage of the reference AC power supply, the current measured voltage by the voltage measuring device comprises: acquiring a ratio of the first decomposition voltage to the second decomposition voltage; and obtaining, based on a product of the ratio and the preset voltage of the reference AC power supply, the current measured voltage by the voltage measuring device. ### Claim 17 (depends on 13) The non-transitory computer-readable storage medium of claim 13, wherein the voltage measuring device further comprises a toggle switch, as well as a first electrode plate, a second electrode plate and a third electrode plate used to form the coupling capacitances, and the first electrode plate, the voltage dividing capacitor, the reference AC power supply, the second electrode plate, the toggle switch and the third electrode plate are connected sequentially, and wherein the adjusting the coupling capacitances comprises: changing a state of the toggle switch, and obtaining adjusted coupling capacitances after change of the state of the toggle switch, the state of the toggle switch comprising an open state or a closed state. ### Claim 18 (depends on 17) The non-transitory computer-readable storage medium of claim 17, wherein the second electrode plate and the third electrode plate are not connected in the open state, and the second electrode plate and the third electrode plate are connected in the closed state.