US 12,461,169 B2
Measurement apparatus, measurement method, and measurement program
Yorikazu Kashiramoto, Tokyo (JP)
Assigned to SO BRAIN CO., LTD., Tokyo (JP)
Appl. No. 18/834,816
Filed by SO BRAIN CO., LTD., Tokyo (JP)
PCT Filed Apr. 30, 2024, PCT No. PCT/JP2024/016652
§ 371(c)(1), (2) Date Mar. 26, 2025,
PCT Pub. No. WO2024/232310, PCT Pub. Date Nov. 14, 2024.
Claims priority of application No. 2023-076502 (JP), filed on May 8, 2023.
Prior Publication US 2025/0231254 A1, Jul. 17, 2025
Int. Cl. G01R 31/52 (2020.01)
CPC G01R 31/52 (2020.01) 5 Claims
OG exemplary drawing
 
1. A measurement apparatus comprising:
a measurement unit including any two or more of a first measurement unit configured to calculate a leakage current component caused by a ground insulation resistance based on a waveform of a leakage current detected by a first leakage current detector which detects the leakage current flowing in a wireway to be measured to which a load is connected and a waveform of a voltage detected by a first voltage detector which detects the voltage applied between two phases to which a load is connected in a wireway branched from a wireway to be measured to which a star-connected three-phase AC power source is connected or a wireway to be measured to which a three-phase circuit composed of a star-connected three-phase AC power source is connected and branched from a three-phase AC to a single-phase AC and distributed,
a second measurement unit configured to calculate a leakage current component caused by a ground insulation resistance based on a waveform of a leakage current detected by a second leakage current detector which detects the leakage current flowing in a wireway to be measured to which a load is connected and a waveform of a voltage detected by a second voltage detector which detects the voltage applied between two phases to which a load is connected in a wireway branched from a wireway to be measured to which a star-connected three-phase AC power source is connected or a wireway to be measured to which a three-phase circuit composed of a star-connected three-phase AC power source is connected and branched from a three-phase AC to a single-phase AC and distributed,
a third measurement unit configured to calculate a leakage current component caused by a ground insulation resistance based on a waveform of a leakage current detected by a third leakage current detector which detects the leakage current flowing in a single-phase circuit branched from a delta connection and a waveform of a voltage detected by a third voltage detector which detects the voltage applied between phases to which a load is connected in a wireway branched from a wireway to be measured to which a delta-connected three-phase AC power source is connected or a wireway to be measured to which a three-phase circuit composed of a delta-connected three-phase AC power source is connected and branched from a three-phase AC to a single-phase AC and distributed, and
a fourth measurement unit configured to calculate a leakage current component caused by a ground insulation resistance based on a waveform of a leakage current detected by a fourth leakage current detector which detects the leakage current flowing in the wireway to be measured to which a load is connected and a waveform of a voltage detected by a fourth voltage detector which detects the voltage applied between phases to which a load is connected in a wireway branched from a wireway to be measured to which a delta-connected three-phase AC power source is connected or a wireway to be measured to which a three-phase circuit composed of a delta-connected three-phase AC power source is connected and branched from a three-phase AC to a single-phase AC and distributed; and
a selection processor configured to select any one of the measurement units in the measurement unit.