Load testing device

A load testing device comprising:

• a terminal unit connected to a test target power supply;
• a main relay unit;
• a first resistance unit including a 11th R-phase resistor group, a 12th R-phase resistor group, a 11th S-phase resistor group, a 12th S-phase resistor group, a 11th T-phase resistor group, a 12th T-phase resistor group, and a first switch group;
• a second resistance unit including a 21st R-phase resistor group, a 22nd R-phase resistor group, a 21st S-phase resistor group, a 22nd S-phase resistor group, a 21 st T-phase resistor group, a 22nd T-phase resistor group, and a second switch group;
• and
• a housing that accommodates the terminal unit, the first resistance unit, and the second resistance unit,
• wherein:
• each of the 11th R-phase resistor group, the 12th R-phase resistor group, the 11th S-phase resistor group, the 12th S-phase resistor group, the 11th T-phase resistor group, the 12th T-phase resistor group, the 21st R-phase resistor group, the 22nd R-phase resistor group, the 21st S-phase resistor group, the 22nd S-phase resistor group, the 21st T-phase resistor group, and the 22nd T-phase resistor group includes at least one resistor;
• the main relay unit and the first switch group are used to switch a connection state between the 11th R-phase resistor group and the 12th R-phase resistor group between series and parallel, switch a connection state between the 11th S-phase resistor group and the 12th S-phase resistor group between series and parallel, and switch a connection state between the 11th T-phase resistor group and the 12th T-phase resistor group between series and parallel;
• the main relay unit and the second switch group are used to switch a connection state between the 21st R-phase resistor group and the 22nd R-phase resistor group between series and parallel, switch a connection state between the 21st S-phase resistor group and the 22nd S-phase resistor group between series and parallel, and switch a connection state between the 21st T-phase resistor group and the 22nd T-phase resistor group between series and parallel;
• power from an R-phase terminal of the test target power supply is supplied to the 11th R-phase resistor group, the 12th R-phase resistor group, the 21st R-phase resistor group, and the 22nd R-phase resistor group via the terminal unit;
• power from an S-phase terminal of the test target power supply is supplied to the 11th S-phase resistor group, the 12th S-phase resistor group, the 21st S-phase resistor group, and the 22nd S-phase resistor group via the terminal unit;
• power from a T-phase terminal of the test target power supply is supplied to the 11th T-phase resistor group, the 12th T-phase resistor group, the 21st T-phase resistor group, and the 22nd 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 11th R-phase resistor group, the 12th R-phase resistor group, the 21st R-phase resistor group, and the 22nd R-phase resistor group;
• the second accommodation region accommodates the 11th S-phase resistor group, the 12th S-phase resistor group, the 21st S-phase resistor group, and the 22nd S-phase resistor group;
• the third accommodation region accommodates the 11th T-phase resistor group, the 12th T-phase resistor group, the 21st T-phase resistor group, and the 22nd T-phase resistor group;
• the fourth accommodation region accommodates the terminal unit, a relay of the main relay unit, at least some relays of the first switch group, and at least some relays of the second switch group;
• and
• the fifth accommodation region accommodates at least one of remaining relays of the first switch group and remaining relays of the second switch group.