US 12,332,321 B2
Load testing device
Toyoshi Kondo, Tokyo (JP)
Assigned to TATSUMI RYOKI CO., LTD, Tokyo (JP)
Appl. No. 18/273,203
Filed by TATSUMI RYOKI CO., LTD, Tokyo (JP)
PCT Filed Jan. 31, 2022, PCT No. PCT/JP2022/003532
§ 371(c)(1), (2) Date Jul. 19, 2023,
PCT Pub. No. WO2022/181216, PCT Pub. Date Sep. 1, 2022.
Claims priority of application No. 2021-027169 (JP), filed on Feb. 24, 2021.
Prior Publication US 2024/0027542 A1, Jan. 25, 2024
Int. Cl. G01R 1/20 (2006.01); G01R 31/34 (2020.01); G01R 31/42 (2006.01)
CPC G01R 31/42 (2013.01) [G01R 1/203 (2013.01); G01R 1/206 (2013.01); G01R 31/343 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A load testing device comprising:
a terminal unit connected to a test target power supply;
a main relay unit;
a resistance unit including a first R-phase resistor group, a second R-phase resistor group, a first S-phase resistor group, a second S-phase resistor group, a first T-phase resistor group, a second T-phase resistor group, and a switch group; and
a housing that accommodates the terminal unit and the resistance unit,
wherein:
each of the first R-phase resistor group, the second R-phase resistor group, the first S-phase resistor group, the second S-phase resistor group, the first T-phase resistor group, and the second T-phase resistor group includes at least one resistor;
the main relay unit and the switch group are used to switch a connection state between the first R-phase resistor group and the second R-phase resistor group between series and parallel, switch a connection state between the first S-phase resistor group and the second S-phase resistor group between series and parallel, and switch a connection state between the first T-phase resistor group and the second T-phase resistor group between series and parallel;
power from an R-phase terminal of the test target power supply is supplied to the first R-phase resistor group and the second R-phase resistor group via the terminal unit;
power from an S-phase terminal of the test target power supply is supplied to the first S-phase resistor group and the second S-phase resistor group via the terminal unit;
power from a T-phase terminal of the test target power supply is supplied to the first T-phase resistor group and the second T-phase resistor group via the terminal unit;
a first accommodation region, a second accommodation region, and a third accommodation region in the housing are located between a fourth accommodation region and a fifth accommodation region in the housing;
the second accommodation region is located between the first accommodation region and the third accommodation region;
the first accommodation region accommodates the first R-phase resistor group and the second R-phase resistor group;
the second accommodation region accommodates the first S-phase resistor group and the second S-phase resistor group;
the third accommodation region accommodates the first T-phase resistor group and the second T-phase resistor group;
the fourth accommodation region accommodates the terminal unit, a relay of the main relay unit, and some relays of the switch group; and
the fifth accommodation region accommodates remaining relays of the switch group.