Load Testing Systems

Abstract

A load testing system capable of safely performing a load test on a power supply under test is provided. The load testing system includes a plurality of sets of load testing apparatuses each having a first load testing section including one or more resistor units and a first cutoff device. Power is supplied from a power source under test to at least one resistor unit in the one or more resistor units via at least a cutoff section separate from the load testing apparatuses and the first cutoff device. The cutoff section performs on-off control of power supply to at least one load testing apparatus in the plurality of sets of load testing apparatuses. The first cutoff device performs on-off control of power supply to at least a resistor unit in the one or more resistor units connected to the first cutoff device.

Description

[Technical field]

[0001] The present invention relates to a load testing system and the like. [Background technology]

[0002] Conventionally, a load testing device has been proposed, as disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-019231 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the safety of performing a load test on the power supply under test is not sufficient.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a load testing system that is capable of safely performing a load test on a power supply under test. [Means for solving the problem]

[0006] The load testing system according to the present invention includes a plurality of sets of load testing devices each having a first load testing section including one or more resistance units and a first interrupting device. Power is supplied from the power supply under test to at least one of the one or more resistor units via at least a breaker section separate from the load testing apparatus and the first breaker device. The cutoff unit performs on / off control of power supply to at least one of the plurality of sets of load testing devices. The first cutoff device controls on / off of power supply to at least one of the one or more resistor units that is connected to the first cutoff device.

[0007] Since power is supplied from the power supply under test to the group of resistors via multiple circuit breakers, even if there is a malfunction in one of the circuit breakers, the possibility of power being mistakenly supplied to the group of resistors is reduced, and load testing of the power supply under test can be performed safely.

[0008] Preferably, the one or more resistor units include a first U-phase resistor unit, a second U-phase resistor unit, a third U-phase resistor unit, a first V-phase resistor unit, a second V-phase resistor unit, a third V-phase resistor unit, a first W-phase resistor unit, a second W-phase resistor unit, and a third W-phase resistor unit. The load testing apparatus has a first load testing section including the first U phase resistor unit, the second U phase resistor unit, the first V phase resistor unit, the second V phase resistor unit, the first W phase resistor unit, the second W phase resistor unit, and the first breaking device, and a second load testing section including the third U phase resistor unit, the third V phase resistor unit, and the third W phase resistor unit. Power supply from the test target power supply to the first U phase resistor unit, the second U phase resistor unit, the first V phase resistor unit, the second V phase resistor unit, the first W phase resistor unit, and the second W phase resistor unit is performed via at least the cutoff section and the first cutoff device. Power supply from the test power supply to the third U-phase resistor unit, the third V-phase resistor unit, and the third W-phase resistor unit is performed via at least the cut-off unit and a second cut-off device provided in the first cut-off device or the second load testing unit.

[0009] By including large capacity resistors in the resistor group of each resistor unit, it becomes possible to safely perform load testing of high voltage power supplies under test. In particular, there is no need to step down the voltage of the power from the power supply under test using a transformer or the like. Therefore, compared to load tests that involve stepping down the voltage using a transformer or the like, it is possible to supply power to each load test section using a thin power supply cable. In addition, compared to configurations that involve stepping down using a transformer or the like, it becomes possible to perform load testing under conditions that are closer to actual use. Moreover, the first load testing section and the second load testing section can be used for separate load tests, or can be used for a single combined load test.

[0010] More preferably, the resistors in each resistor group of the one or more resistor units extend in the x-direction. The first U-phase resistor unit, the second U-phase resistor unit, the third U-phase resistor unit, the first V-phase resistor unit, the second V-phase resistor unit, the third V-phase resistor unit, the first W-phase resistor unit, the second W-phase resistor unit, and the third W-phase resistor unit are arranged in a y-direction perpendicular to the x-direction. A surface of a holding frame that holds the resistor groups of each of the one or more resistor units and that holds the terminals of the resistors is covered with a removable transparent cover.

[0011] It is possible to prevent dust and other particles from adhering to the tip of the resistor terminal. Furthermore, even if dust or the like adheres to the surface, it can be easily seen from the outside and can be easily removed.

[0012] Also preferably, the resistors in the resistor group of each of the one or more resistor units extend in the x-direction. The first U-phase resistor unit, the second U-phase resistor unit, the third U-phase resistor unit, the first V-phase resistor unit, the second V-phase resistor unit, the third V-phase resistor unit, the first W-phase resistor unit, the second W-phase resistor unit, and the third W-phase resistor unit are arranged in a y-direction perpendicular to the x-direction. At least the first U-phase resistor unit includes a cooling portion that cools the resistor group of the first U-phase resistor unit. The cooling portion of the first U-phase resistor unit includes two cooling fans aligned in the x direction. The cooling portion of the first U-phase resistor unit is provided with a guide wall including a slope. The guide wall guides the cooling air from one of the cooling fans toward one of the rotation shafts of the cooling fans, and guides the cooling air from the other of the cooling fans toward the other rotation shaft of the cooling fans.

[0013] The direction in which the cooling air flows is controlled, making it easier to supply the cooling air to a wide area in which a resistor group including long resistors is located.

[0014] In addition, preferably, the one or more resistor units include the first U phase resistor unit, the second U phase resistor unit, the third U phase resistor unit, a fourth U phase resistor unit, the first V phase resistor unit, the second V phase resistor unit, the third V phase resistor unit, a fourth V phase resistor unit, the first W phase resistor unit, the second W phase resistor unit, the third W phase resistor unit, and a fourth W phase resistor unit. The first U-phase resistor unit and the second U-phase resistor unit are aligned in the x direction. The first V-phase resistor unit and the second V-phase resistor unit are aligned in the x-direction. The first W-phase resistor unit and the second W-phase resistor unit are aligned in the x-direction. The third U-phase resistor unit and the fourth U-phase resistor unit are aligned in the x-direction. The third V-phase resistor unit and the fourth V-phase resistor unit are aligned in the x-direction. The third W-phase resistor unit and the fourth W-phase resistor unit are aligned in the x-direction. The first U-phase resistor unit, the first V-phase resistor unit, the first W-phase resistor unit, the third U-phase resistor unit, the third V-phase resistor unit, and the third W-phase resistor unit are arranged in a y-direction perpendicular to the x-direction. The second U-phase resistor unit, the second V-phase resistor unit, the second W-phase resistor unit, the fourth U-phase resistor unit, the fourth V-phase resistor unit, and the fourth W-phase resistor unit are aligned in the y direction. An area including the first U-phase resistor unit, the second U-phase resistor unit, the first V-phase resistor unit, the second V-phase resistor unit, the first W-phase resistor unit, and the second W-phase resistor unit is arranged between an area including the first cutting device and an area including the third U-phase resistor unit, the fourth U-phase resistor unit, the third V-phase resistor unit, the fourth V-phase resistor unit, the third W-phase resistor unit, and the fourth W-phase resistor unit. The distance in the y direction between the first U-phase resistor unit and the first V-phase resistor unit, and the distance in the y direction between the first W-phase resistor unit and the third U-phase resistor unit are larger than the distance in the y direction between the first V-phase resistor unit and the first W-phase resistor unit.

[0015] This makes it possible to fit the load test equipment into a 40 foot container while still maintaining sufficient electrical isolation. In addition, it becomes possible for a worker to enter an area where there is a large gap in the y direction, such as between the first U-phase resistor unit and the first V-phase resistor unit, and perform work such as maintenance.

[0016] In addition, preferably, the one or more resistor units include the first U phase resistor unit, the second U phase resistor unit, the third U phase resistor unit, a fourth U phase resistor unit, the first V phase resistor unit, the second V phase resistor unit, the third V phase resistor unit, a fourth V phase resistor unit, the first W phase resistor unit, the second W phase resistor unit, the third W phase resistor unit, and a fourth W phase resistor unit. The first U-phase resistor unit and the second U-phase resistor unit are aligned in the x direction. The first V-phase resistor unit and the second V-phase resistor unit are aligned in the x-direction. The first W-phase resistor unit and the second W-phase resistor unit are aligned in the x-direction. The third U-phase resistor unit and the fourth U-phase resistor unit are aligned in the x-direction. The third V-phase resistor unit and the fourth V-phase resistor unit are aligned in the x-direction. The third W-phase resistor unit and the fourth W-phase resistor unit are aligned in the x-direction. The first U-phase resistor unit, the first V-phase resistor unit, the first W-phase resistor unit, the third U-phase resistor unit, the third V-phase resistor unit, and the third W-phase resistor unit are arranged in a y-direction perpendicular to the x-direction. The second U-phase resistor unit, the second V-phase resistor unit, the second W-phase resistor unit, the fourth U-phase resistor unit, the fourth V-phase resistor unit, and the fourth W-phase resistor unit are aligned in the y direction. in each of the first U-phase resistor unit, the second U-phase resistor unit, the third U-phase resistor unit, the fourth U-phase resistor unit, the first V-phase resistor unit, the second V-phase resistor unit, the third V-phase resistor unit, the fourth V-phase resistor unit, the first W-phase resistor unit, the second W-phase resistor unit, the third W-phase resistor unit, and the fourth W-phase resistor unit. Resistance The resistors of the resistor group extend in the y direction. In the first U-phase resistor unit The above A holder frame for holding a resistor group and a resistor unit for the first V phase The above The distance between the retaining frames for retaining the resistor groups, the retaining frame of the first V-phase resistor unit and the first W-phase resistor unit The above The spacing of the retaining frame that holds the resistor group, the third U-phase resistor unit The above The resistor group holder and the 3rd V-phase resistor holder The resistor unit The spacing of the retaining frame that holds the resistor group, and the third V-phase resistor unit The distance between the holding frame of the first U-phase resistor unit and a holding frame that holds the resistor group in the third W-phase resistor unit is 80% of the width in the y direction of the holding frame of the first U-phase resistor unit.

[0017] The interval between adjacent holder frames is about 80% of the longitudinal length of resistor R, which is approximately equal to the length of the holder frame. This allows the load testing equipment to be stored in a container of a specified size while maintaining sufficient electrical isolation, and also makes it possible to easily remove resistors extending in the y direction from between the holding frames.

[0018] More preferably, the region including the first cutting device is arranged between the region including the first U phase resistor unit, the second U phase resistor unit, the first V phase resistor unit, the second V phase resistor unit, the first W phase resistor unit, and the second W phase resistor unit, and the region including the third U phase resistor unit, the fourth U phase resistor unit, the third V phase resistor unit, the fourth V phase resistor unit, the third W phase resistor unit, and the fourth W phase resistor unit.

[0019] By placing an area including the first circuit breaker in the center in the y direction, and placing an area including a first U-phase resistance unit, etc. and an area including a third U-phase resistance unit, etc. on either side of it, it is possible to improve the longitudinal weight balance of a single container.

[0020] In addition, preferably, each of the one or more resistor units includes a resistor group, a holding frame that holds the resistor group, and a cooling section that cools the resistor group. The resistor group includes a plurality of resistors. The resistors are aligned at least in a first direction perpendicular to a direction in which the cooling section and the holding frame are aligned. In an area including a line along which the rotation axis of the cooling fan of the cooling unit extends and the center of the first direction of the area in which the multiple resistors are arranged, the resistors are arranged with wider intervals between each other than in other areas in which the multiple resistors are arranged.

[0021] Compared to a configuration in which the resistors are arranged at equal intervals in the first direction, cooling air flows more easily through the area including the rotating shaft.

[0022] Also, preferably, each of the one or more resistance units is , resistance The device further includes a holder for holding the resistor group. The inner wall of the holding frame is formed with protrusions for diffusing cooling air.

[0023] The protrusions change the direction in which the cooling air flows, making it easier for the cooling air to diffuse inside the holding frame.

[0024] Also, preferably, each of the one or more resistance units is , resistance The resistor group includes a holding frame that holds the resistor group, and a cooling portion that cools the resistor group. The cooling section includes a plurality of cooling fans. The plurality of cooling fans are disposed at an angle with respect to a plane perpendicular to the direction in which the cooling section and the holding frame are arranged so that cooling air collides with an area including the resistor group.

[0025] The cooling airflows from the multiple cooling fans collide in the area including the resistor group, changing the flow direction of the cooling airflow, which tends to diffuse inside the holding frame.

[0026] In a preferred embodiment, the load testing system further includes a control unit connected by wire to each of the plurality of sets of load testing devices, and transmitting a control signal to each of the plurality of sets of load testing devices.

[0027] A single control unit C1 can collectively manage the operation control of multiple load testing devices (multiple load testing units).In addition, because the connection is wired, it is possible to reliably control the operation of multiple load testing devices (multiple load testing units) that are safely located apart, unless there is a physical break.

[0028] Also, preferably, each of the one or more resistance units is , resistance The cooling section cools the resistor group. The cooling section includes a cooling fan that is driven by power from the power supply under test. The first circuit breaking device is provided with a power storage unit that stores power from the test target power supply. When the power supply from the test power supply is cut off, the power storage unit drives the cooling fan.

[0029] Each component of the load test device can be driven using power from the power supply under test without providing an auxiliary power supply separate from the power supply under test. In particular, even when the power supply from the power supply under test is cut off, the cooling fan and other components can be driven stably.

[0030] In addition, preferably, the plurality of sets of load testing devices include at least a first load testing device, a second load testing device, a third load testing device, a fourth load testing device, and a fifth load testing device; The interrupter portion has at least a first interrupter portion and a second interrupter portion. The power supply from the test target power supply to the first load testing device, the second load testing device and the third load testing device is performed via at least the first cutoff unit. The power supply from the test target power supply to the fourth load testing device and the fifth load testing device is performed at least via the second cutoff unit.

[0031] A plurality of interrupting units are provided, and each of the plurality of interrupting units is connected to two or three load test devices. Therefore, compared to a configuration in which one interrupting unit is connected to many load test devices, it is possible to configure the load test system of the present invention using interrupting units with a small capacity. Also, when a malfunction occurs in the interrupting unit, it is possible to reduce the number of load test devices that are affected.

[0032] In addition, preferably, each of the one or more resistance units includes a resistor group, a holding frame that holds the resistor group, a cooling section that cools the resistor group, and an insulator provided between the holding frame and the cooling section. The insulator and the cooling portion are attached via a first mounting fixture. The insulator and the holding frame are attached via a second mounting metal fitting that is different from the first mounting metal fitting.

[0033] Easy and reliable installation of insulators cooling This makes it possible to fix the part between the holder and the holder frame. Also, compared to a configuration in which the insulator is directly attached to a holding frame or the like without using mounting brackets, this configuration makes it possible to easily replace just the insulator with a new insulator.

[0034] More preferably, each of the one or more resistor units includes a hood including a first insulating plate and a second insulating plate. The first insulating plate is attached to the cooling section via a third mounting metal fitting that is different from the first mounting metal fitting and the second mounting metal fitting. The second insulating plate is attached to the cooling portion via the first mounting fixture. The tip of the hood is located inside the holding frame.

[0035] While maintaining insulation, cooling air from the cooling section can be supplied to the inside of the holding frame without leaking to the outside. The components that make up the hood (first insulating plate, second insulating plate) can be easily attached and detached via the components for fixing the insulator (first mounting bracket, third mounting bracket).

[0036] In addition, preferably, the cooling portion includes a pressure fan type cooling fan including a bell mouth.

[0037] Even in a configuration in which the space for taking in air is small, it becomes easy to send cooling air to the resistor group.

[0038] Also, preferably, power supply from the power supply under test to at least one of the one or more resistor units is performed at least via the interrupter section, the first interrupter device, and a switching device of the one or more resistor units. The switching device controls on / off of power supply to each of the one or more resistor units, or controls on / off of power supply to each of a plurality of resistor groups provided in each of the one or more resistor units.

[0039] Since power is supplied from the power supply under test to the resistor group via multiple circuit-breaking means (circuit-breaking section, circuit-breaking device, switching device), even if there is a malfunction in one circuit-breaking means, the possibility of power being mistakenly supplied to the resistor group is reduced.

[0040] Also, preferably, the one or more resistance units are constituted by one resistance unit. The above Number The housing of each of the load test apparatuses of the set holds a group of resistors in one of the resistance units. Effect of the Invention

[0041] As described above, according to the present invention, it is possible to provide a load testing system that is capable of safely performing a load test on a power supply under test. [Brief description of the drawings]

[0042] [Figure 1] 1 is a configuration diagram of a load testing system according to a first embodiment. [Diagram 2] FIG. 1 is a configuration diagram of a first load testing device and a first interrupter in a first embodiment. [Diagram 3] 13 is a diagram showing the internal configuration of the first U-phase resistor unit as viewed from the y direction. FIG. [Figure 4] 13 is a diagram showing the internal configuration of the first U-phase resistor unit as viewed from the x direction. FIG. [Diagram 5] 11 is a diagram showing the internal configuration of a 1U-phase resistor unit including a plurality of 11U-phase cooling fans arranged diagonally. FIG. [Figure 6] FIG. 13 is a diagram showing the internal structures of the eleventh and twelfth housings as viewed from the x direction. [Figure 7] FIG. 13 is a diagram showing the internal structure of the twelfth housing as viewed from the y direction. [Figure 8] FIG. 11 is a configuration diagram of a load testing system according to a second embodiment. [Figure 9] FIG. 11 is a configuration diagram of a first load testing device and a first interrupter unit in the second embodiment. [Figure 10]FIG. 13 is a configuration diagram of a load testing system according to a third embodiment. [Figure 11] FIG. 11 is a configuration diagram of a first load testing device and a first interrupter unit in a third embodiment. [Figure 12] FIG. 13 is a diagram showing the internal structures of the 11th housing, the 12th housing, and the 22nd housing in the third embodiment as viewed from the x direction. [Figure 13] FIG. 13 is a configuration diagram of a first load testing device and a first interrupter unit in a fourth embodiment. [Figure 14] FIG. 13 is a diagram showing the internal structures of the 11th housing, the 12th housing, and the 22nd housing in the fourth embodiment as viewed from the x direction. [Figure 15] FIG. 13 is a diagram showing the internal structure of a twelfth housing in the fourth embodiment as viewed from the y direction. [Figure 16] FIG. 13 is a configuration diagram of a first load testing section and a first interrupting section in the fifth embodiment. [Figure 17] FIG. 13 is a diagram showing the internal structures of the 11th housing, the 12th housing, and the 22nd housing in the fifth embodiment as viewed from the x direction. [Figure 18] FIG. 13 is a configuration diagram of a load testing system according to a sixth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0043] The first embodiment will be described below with reference to the drawings. The embodiments are not limited to the following embodiments. In principle, the contents described in one embodiment are also applicable to other embodiments. The embodiments and modifications can be combined as appropriate.

[0044] (Load test system 1) The load testing system 1 in the first embodiment includes load testing devices (first load testing device A1 to twelfth load testing device A12), a control unit C1, and cutoff units (first cutoff unit D1 to fourth cutoff unit D4).

[0045] To explain the directions, the vertical direction in which the first U-phase resistor unit U1 and the second U-phase resistor unit U2 are arranged is defined as the x-direction (short side direction of the container), the horizontal direction in which the first U-phase resistor unit U1, the first V-phase resistor unit V1, and the first W-phase resistor unit W1 are arranged is defined as the y-direction (longitudinal direction of the container), and the up and down direction perpendicular to the x and y directions is defined as the z-direction (height direction of the container). In addition, in FIG. 2 and FIGS. 9, 11, 13, and 16 described later, power supply to load testing devices (such as the second load testing device A2) other than the first load testing device A1 is not shown. K The power cables and control signal cables are not shown. In addition, in Figs. 15 and 17 described later, only one resistor R provided in the first U-phase resistor unit U1 is shown by a dotted line.

[0046] (First load test device A1~ 12th load test device A12 ) The first load testing device A1 has a first load testing section B1 and a second load testing section B2. The second load testing apparatus A2 has a third load testing section B3 and a fourth load testing section B4. The third load testing apparatus A3 has a fifth load testing section B5 and a sixth load testing section B6. The fourth load testing apparatus A4 has a seventh load testing section B7 and an eighth load testing section B8. The fifth load testing apparatus A5 has a ninth load testing section B9 and a tenth load testing section B10. The sixth load testing apparatus A6 has an eleventh load testing section B11 and a twelfth load testing section B12. The seventh load testing apparatus A7 has a thirteenth load testing section B13 and a fourteenth load testing section B14. The eighth load testing apparatus A8 has a fifteenth load testing section B15 and a sixteenth load testing section B16. The ninth load testing apparatus A9 has a seventeenth load testing section B17 and an eighteenth load testing section B18. The tenth load testing apparatus A10 has a nineteenth load testing section B19 and a twentieth load testing section B20. The eleventh load testing apparatus A11 has a twenty-first load testing section B21 and a twenty-second load testing section B22. The twelfth load testing apparatus A12 has a twenty-third load testing section B23 and a twenty-fourth load testing section B24.

[0047] (Control unit C1) The control unit C1 is configured as a separate entity from the load testing devices (the first load testing device A1 to the twelfth load testing device A12). The control unit C1 is provided with an operation unit that is used to select a load test device to which power is supplied from the test target power supply 100. The control unit C1 is wired to the control units of each load testing unit (first control device 11, second control device 12) via a control signal cable (see dotted lines in Figures 1 and 2) and transmits control signals to the control units of each load testing unit.

[0048] (Effect of providing the control unit C1 separately from the load test device) A single control unit C1 can collectively manage the operation control of multiple load testing devices (multiple load testing units).In addition, because the connection is wired, it is possible to reliably control the operation of multiple load testing devices (multiple load testing units) that are safely located apart, unless there is a physical break. However, instead of / in addition to the operation unit of the control unit C1, an operation unit may be provided for each load testing device or each load testing unit.

[0049] (First cut-off section D1) The first circuit breaker D1 includes a vacuum circuit breaker (VCB) and is connected to the test target power supply 100 on the input side and to the circuit breakers (first circuit breaker 15, second circuit breaker 16) of the first load testing device A1 to the third load testing device A3 on the output side. The first cutoff section D1 controls on / off of the power supply to the first load testing device A1 to the third load testing device A3. Power supplied from the test target power supply 100 is supplied to the resistor group of the first load testing section B1 via the first breaking section D1 and the first breaking device 15 of the first load testing device A1. Power supplied from the test target power supply 100 is supplied to the resistor group of the second load testing section B2 via the first breaking section D1 and the second breaking device 16 of the first load testing device A1. Power supplied from the test target power supply 100 is supplied to a resistor group of the third load testing section B3 via the first circuit breaker section D1 and a first circuit breaker (not shown) of the second load testing device A2. Power supplied from the test target power supply 100 is supplied to a resistor group of the fourth load testing section B4 via the first circuit breaker section D1 and a second circuit breaker (not shown) of the second load testing device A2. Power supplied from the test target power supply 100 is supplied to a resistor group of the fifth load testing section B5 via the first circuit breaker section D1 and a first circuit breaker (not shown) of the third load testing device A3. Power supplied from the test target power supply 100 is supplied to a resistor group of the sixth load testing section B6 via the first circuit breaker section D1 and a second circuit breaker (not shown) of the third load testing device A3.

[0050] (Second cutoff section D2) The second circuit breaker D2 includes a vacuum circuit breaker, and is connected to the test target power supply 100 on the input side and to the circuit breakers of the fourth load testing device A4 to the sixth load testing device A6 on the output side. The second circuit breaker D2 controls on / off of the power supply to the fourth load testing device A4 to the sixth load testing device A6. The power supplied from the test target power supply 100 is supplied to the resistor group of the seventh load testing section B7 via the second circuit breaker section D2 and a first circuit breaker (not shown) of the fourth load testing device A4. The power supplied from the test target power supply 100 is supplied to the resistor group of the eighth load testing section B8 via the second circuit breaker section D2 and a second circuit breaker (not shown) of the fourth load testing device A4. The power supplied from the test target power supply 100 is supplied to the resistor group of the ninth load testing section B9 via the second circuit breaker section D2 and a first circuit breaker (not shown) of the fifth load testing device A5. Power supplied from the test target power supply 100 is supplied to the resistor group of the tenth load testing section B10 via the second circuit breaker section D2 and a second circuit breaker (not shown) of the fifth load testing device A5. The power supplied from the test target power supply 100 is supplied to the resistor group of the eleventh load testing section B11 via the second breaking section D2 and a first breaking device (not shown) of the sixth load testing device A6. The power supplied from the test target power supply 100 is supplied to the resistor group of the twelfth load testing section B12 via the second circuit breaker section D2 and a second circuit breaker (not shown) of the sixth load testing device A6.

[0051] (Third cut-off section D3) The third circuit breaker D3 includes a vacuum circuit breaker, and is connected to the test target power supply 100 on the input side and to the circuit breakers of the seventh load testing device A7 to the ninth load testing device A9 on the output side. The third cutoff section D3 controls on / off of the power supply to the seventh load testing device A7 to the ninth load testing device A9. The power supplied from the test target power supply 100 is supplied to the resistor group of the thirteenth load testing section B13 via the third breaking section D3 and a first breaking device (not shown) of the seventh load testing device A7. The power supplied from the test target power supply 100 is supplied to the resistor group of the fourteenth load testing section B14 via the third circuit breaker D3 and a second circuit breaker (not shown) of the seventh load testing device A7. The power supplied from the test target power supply 100 is supplied to the resistor group of the fifteenth load testing section B15 via the third breaking section D3 and a first breaking device (not shown) of the eighth load testing device A8. The power supplied from the test target power supply 100 is supplied to the resistor group of the 16th load testing section B16 via the third breaking section D3 and a second breaking device (not shown) of the eighth load testing device A8. The power supplied from the test target power supply 100 is supplied to the resistor group of the 17th load testing section B17 via the third breaking section D3 and a first breaking device (not shown) of the ninth load testing device A9. The power supplied from the test target power supply 100 is supplied to the resistor group of the 18th load testing section B18 via the third breaking section D3 and a second breaking device (not shown) of the ninth load testing device A9.

[0052] (Fourth cut-off section D4) The fourth circuit breaker D4 includes a vacuum circuit breaker, and is connected to the test target power supply 100 on the input side and to the circuit breakers of the tenth load testing device A10 to twelfth load testing device A12 on the output side. The fourth circuit breaker D4 controls on / off of the power supply to the tenth load testing device A10 to the twelfth load testing device A12. The power supplied from the test target power supply 100 is supplied to the resistor group of the 19th load testing section B19 via the fourth breaking section D4 and a first breaking device (not shown) of the 10th load testing device A10. The power supplied from the test target power supply 100 is supplied to the resistor group of the 20th load testing section B20 via the fourth breaking section D4 and a second breaking device (not shown) of the 10th load testing device A10. The power supplied from the test target power supply 100 is supplied to the resistor group of the 21st load testing section B21 via the fourth breaking section D4 and a first breaking device (not shown) of the 11th load testing device A11. The power supplied from the test target power supply 100 is supplied to the resistor group of the 22nd load testing section B22 via the 4th breaking section D4 and a second breaking device (not shown) of the 11th load testing device A11. The power supplied from the test target power supply 100 is supplied to the resistor group of the 23rd load testing section B23 via the 4th breaking section D4 and a first breaking device (not shown) of the 12th load testing device A12. The power supplied from the test target power supply 100 is supplied to the resistor group of the 24th load testing section B24 via the fourth breaking section D4 and a second breaking device (not shown) of the 12th load testing device A12.

[0053] (Effect of providing multiple cutoff means) Since power is supplied from the power supply 100 under test to the group of resistors via multiple cut-off means (cut-off section, cut-off device, switching device described later), even if there is a malfunction in one of the cut-off means, the possibility of power being mistakenly supplied to the group of resistors is reduced, and a load test of the power supply 100 under test can be performed safely. In addition, the load testing system 1 of the present invention can be easily formed by providing multiple sets of existing load testing equipment including a circuit breaker (such as the first circuit breaker 15) and a switching device, and further providing a circuit breaker section (such as the first circuit breaker section D1).

[0054] (Effect of providing multiple interrupters) A plurality of interrupting units (first interrupting unit D1 to fourth interrupting unit D4) are provided, and each of the plurality of interrupting units is connected to two or three load testing devices. Therefore, compared to a configuration in which one interrupting unit is connected to many load testing devices, it is possible to configure the load testing system of the present invention using a small-capacity interrupting unit. Also, when a malfunction occurs in a interrupting unit, it is possible to reduce the number of load testing devices that are affected.

[0055] (First load test section B1) The first load testing section B1 includes six resistance units (first U-phase resistance unit U1, second U-phase resistance unit U2, first V-phase resistance unit V1, second V-phase resistance unit V2, first W-phase resistance unit W1, and second W-phase resistance unit W2), a control section (first control device 11), and a breaking device (first breaking device 15).

[0056] Each of the first U-phase resistor unit U1 and the second U-phase resistor unit U2 has a plurality of resistor groups and a cooling section that supplies cooling air to the plurality of resistor groups. The resistor group of the first U-phase resistor unit U1 and the resistor group of the second U-phase resistor unit U2 are connected in series, however, the resistor group of the first U-phase resistor unit U1 and the resistor group of the second U-phase resistor unit U2 may be connected in parallel. Power is supplied from the R-phase terminal of the test target power supply 100 via the first circuit breaker D1 and the first circuit breaker device 15 to the resistor groups of the first U-phase resistor unit U1 and the second U-phase resistor unit U2. Power is supplied from an auxiliary power supply separate from the power supply 100 under test to the cooling sections of the first U-phase resistor unit U1 and the second U-phase resistor unit U2. However, power from the test target power supply 100 may be supplied to the cooling sections of the first U-phase resistor unit U1 and the second U-phase resistor unit U2.

[0057] Next, the configuration of the resistor group and cooling section of the first U-phase resistor unit U1 will be described (see Figs. 3 and 4). The following description will be given assuming that the resistor group of the 1st U phase resistor unit U1 is the 11th U phase resistor group UR11, the cooling section of the 1st U phase resistor unit U1 is the 11th U phase cooling section UC11, and the cooling fan of the 11th U phase cooling section UC11 is the 11th U phase cooling fan UF11. In addition, the resistor group of the second U phase resistor unit U2 is the 12U phase resistor group UR12, the cooling section of the second U phase resistor unit U2 is the 12U phase cooling section UC12, and the cooling fan of the 12U phase cooling section UC12 is the 12U phase cooling fan UF12. In addition, the resistor group of the 1st V-phase resistor unit V1 is described as the 11th V-phase resistor group VR11, the cooling section of the 1st V-phase resistor unit V1 is the 11th V-phase cooling section VC11, and the cooling fan of the 11th V-phase cooling section VC11 is the 11th V-phase cooling fan VF11. In addition, the resistor group of the 1st W-phase resistor unit W1 is described as the 11th W-phase resistor group WR11, the cooling section of the 1st W-phase resistor unit W1 is the 11th W-phase cooling section WC11, and the cooling fan of the 11th W-phase cooling section WC11 is the 11th W-phase cooling fan WF11.

[0058] The configurations of the 12U phase resistor group UR12 of the second U phase resistor unit U2, the 11V phase resistor group VR11 of the first V phase resistor unit V1, the resistor groups of the second V phase resistor unit V2, the 11W phase resistor group WR11 of the first W phase resistor unit W1, and the resistor groups of the second W phase resistor unit W2 are similar to the configuration of the 11U phase resistor group UR11 of the first U phase resistor unit U1. In addition, the configurations of the 12U phase cooling section UC12 of the second U phase resistor unit U2, the 11V phase cooling section VC11 of the first V phase resistor unit V1, the cooling section of the second V phase resistor unit V2, the 11W phase cooling section WC11 of the first W phase resistor unit W1, and the cooling section of the second W phase resistor unit W2 are similar to the configuration of the 11U phase cooling section UC11 of the first U phase resistor unit U1. In addition, the configurations of the 12U-phase cooling fan UF12 of the second U-phase resistor unit U2, the 11V-phase cooling fan VF11 of the first V-phase resistor unit V1, the cooling fans of the second V-phase resistor unit V2, the 11W-phase cooling fan WF11 of the first W-phase resistor unit W1, and the cooling fans of the second W-phase resistor unit W2 are similar to the configuration of the 11U-phase cooling fan UF11 of the first U-phase resistor unit U1.

[0059] (Configuration of UC11 cooling unit for 11U phase) The 11U-phase cooling unit UC11 is disposed below the 11U-phase resistor group UR11. An 11U-phase cooling fan UF11 of the 11U-phase cooling unit UC11 takes in air from the side or below, and supplies cooling air to the 11U-phase resistor group UR11 above. The 11U-phase cooling unit UC11 holds, via insulators F, the 11U-phase resistor group UR11. When viewed from the z direction, the 11U-phase resistor group UR11 is located inside the outer shape of the 11U-phase cooling unit UC11.

[0060] (Installation of insulator F) The lower part of the insulator F is attached to the frame of the 11U phase cooling unit UC11, i.e., the base that holds the 11U phase cooling fan UF11 of the 11U phase cooling unit UC11, via a first mounting bracket F1 extending in the x direction, such as channel steel. The first mounting fixture F1 is attached to the frame of the 11U phase cooling unit UC11, that is, to the base that holds the 11U phase cooling fan UF11 of the 11U phase cooling unit UC11. However, the lower portion of the insulator F may be attached directly to the frame of the 11th U-phase cooling unit UC11 without using the first mounting metal fitting F1.

[0061] An upper portion of the insulator F is attached to a holding frame UR11a that holds the resistors R of the 11U-phase resistor group UR11 via a second mounting bracket F2 that extends in the x-direction, such as an angle steel. The second mounting bracket F2 is attached to a retaining frame UR11a that holds the resistors R of the 11U-phase resistor group UR11. However, the upper portion of the insulator F may be attached directly to the holding frame UR11a without using the second mounting bracket F2.

[0062] (Effect of attaching the insulator to a holder frame, etc. via a mounting bracket) Easy and reliable installation of insulators cooling This makes it possible to fix the part between the holder and the holder frame. Also, compared to a configuration in which the insulator is directly attached to a holding frame or the like without using mounting brackets, this configuration makes it possible to easily replace just the insulator with a new insulator.

[0063] (Food) It is desirable to provide a hood having a substantially hollow rectangular shape that is composed of a first insulating plate IB1 perpendicular to the x direction and a second insulating plate IB2 perpendicular to the y direction and that surrounds the flow path of the cooling air between the 11U phase cooling section UC11 and the 11U phase resistor group UR11. The first insulating plate IB1 is attached by screws or the like to a third mounting fixture F3 extending in the y direction. The third mounting fixture F3 is attached to the frame of the 11U phase cooling unit UC11, that is, to the base that holds the 11U phase cooling fan UF11 of the 11U phase cooling unit UC11. The second insulating plate IB2 is attached to the first mounting fixture F1 by means of screws or the like.

[0064] The members constituting the hood (the first insulating plate IB1 and the second insulating plate IB2) may be integrally formed or may be formed separately. The tip portions (upper ends) of the members (first insulating plate IB1, second insulating plate IB2) constituting the hood are located inside the retaining frame UR11a of the 11U-phase resistor group UR11 and do not contact the retaining frame UR11a.

[0065] (Effect of providing a hood, etc.) While maintaining insulation, cooling air from the cooling section can be supplied to the inside of the holding frame without leaking to the outside. The members constituting the hood (first insulating plate IB1, second insulating plate IB2) can be easily attached and detached via the members for fixing the insulator F (mounting bracket F1, third mounting bracket F3).

[0066] In FIG. 3, the insulator F, the first mounting metal fitting F1, and the second insulating plate IB2 on the front side in the y direction are omitted. Moreover, in FIG. 4, the first insulating plate IB1 on the front side in the x direction is omitted from the illustration. 6, 7, 12, 14, 15 and 17, the first mounting metal fitting F1, the second mounting metal fitting F2, the third mounting metal fitting F3, the first insulating plate IB1 and the second insulating plate IB2 are not shown.

[0067] (Application example 1 of UC11 cooling unit for 11U phase) The cooling fan UF11 for the 11th phase is preferably a pressure fan type including a bell mouth UF11c that covers the outer periphery of the propeller.

[0068] (Effect of installing bell mouth UF11c) Even in a configuration in which the space below the 11U-phase cooling fan UF11 for taking in air is small, it becomes easy to send cooling air to the 11U-phase resistor group UR11 by sucking in air from the side. Therefore, compared to a configuration in which there is a large space for taking in air below the 11U phase cooling fan UF11, it is possible to reduce the dimension in the direction in which the 11U phase cooling unit UC11 and the 11U phase resistor group UR11 are aligned (z direction).

[0069] (Configuration of UR11 resistor group for 11U phase) The 11th U-phase resistor group UR11 includes a plurality of resistors R. The resistor R extends in the y direction, and multiple resistors R are arranged in the x and z directions.

[0070] A plurality of resistors R are arranged at regular intervals in the x direction (first direction) and the z direction. However, in the region including the center in the x direction of the region in which multiple resistors R are arranged (see dotted line in Figure 3), i.e., the region including the line along which the rotation axis LX of the 11U phase cooling fan UF11 extends, it is desirable to arrange the resistors R with a wider spacing than in other regions so that no resistors R are placed, i.e., to form a non-resistor placement region NA.

[0071] (Effect of providing resistor non-placement area NA) Compared to a configuration in which the resistors R are arranged at equal intervals in the x direction, cooling air flows more easily through the area including the rotation axis LX.

[0072] Moreover, it is preferable that a projection UR11b protruding inward is formed on the inner wall of a retaining frame UR11a that retains the resistors R of the 11U-phase resistor group UR11.

[0073] (Effect of Providing Protrusions UR11b on the Inner Wall of the Retaining Frame UR11a) The protrusion UR11b changes the direction in which the cooling air flows, making it easier for the cooling air to diffuse inside the holding frame UR11a.

[0074] In the first embodiment, an example has been described in which the resistor R extends in the y direction, and multiple resistors R are arranged in the x and z directions. However, as shown in a fourth embodiment described later, the resistor R may extend in the x direction, and multiple resistors R may be arranged in the y and z directions. Also, the resistor R may extend in the z direction, and multiple resistors R may be arranged in the x and y directions. Furthermore, the resistor R is not limited to being rod-shaped extending in a straight line, but may be configured in other shapes such as a U-shape.

[0075] In the first embodiment, the example in which the 11U phase cooling unit UC11 and the 11U phase resistor group UR11 are arranged in the z direction has been described. However, the 11U phase cooling unit UC11 and the 11U phase resistor group UR11 may be arranged in the x direction or the y direction.

[0076] (Application example 2 of UC11 cooling unit for 11U phase) The 11U-phase cooling fan UF11 may be configured with one fan, but may also be configured with a plurality of fans arranged diagonally (see FIG. 5). Specifically, two 11U phase cooling fans UF11a and UF11b are positioned so that the cooling air flows face diagonally upward and intersect at the center in the x direction and the center in the y direction of the area including the 11U phase resistor group UR11 when viewed from the z direction. That is, multiple cooling fans, such as the two 11U phase cooling fans UF11a, UF11b, are arranged at an angle with respect to the xy plane perpendicular to the z direction in which the 11U phase cooling unit UC11 and the holding frame UR11a of the 1U phase resistor group UR11 are arranged.

[0077] (Effect of placing the cooling fan at an angle) The cooling air from the two 11U-phase cooling fans UF11a and UF11b collides in the area including the 11U-phase resistor group UR11, changing the direction in which the cooling air flows and making it easier for the cooling air to diffuse inside the holding frame UR11a.

[0078] The number of the 11U-phase cooling fans UF11 arranged diagonally is not limited to two, and three or more may be provided. In this case, three or more 11U phase cooling fans UF11, two 11U phase cooling fans UF11, are arranged so that the cooling air flows face diagonally upward and intersect at the center in the x direction and the center in the y direction of the area including the 11U phase resistor group UR11 when viewed from the z direction.

[0079] However, the fan may be disposed so that the rotation axis LX is parallel to the z direction without being inclined.

[0080] Each of the first V-phase resistor unit V1 and the second V-phase resistor unit V2 has a plurality of resistor groups and a cooling section that supplies cooling air to the plurality of resistor groups. The resistor group of the first V-phase resistor unit V1 and the resistor group of the second V-phase resistor unit V2 are connected in series, however, the resistor group of the first V-phase resistor unit V1 and the resistor group of the second V-phase resistor unit V2 may be connected in parallel. Power is supplied from the S-phase terminal of the test target power supply 100 via the first circuit breaker D1 and the first circuit breaker device 15 to the resistor groups of the first V-phase resistor unit V1 and the second V-phase resistor unit V2. Power is supplied from an auxiliary power supply separate from the power supply 100 under test to the cooling sections of the first V-phase resistor unit V1 and the second V-phase resistor unit V2. However, power from the test target power supply 100 may be supplied to the cooling sections of the first V-phase resistor unit V1 and the second V-phase resistor unit V2.

[0081] Each of the first W-phase resistor unit W1 and the second W-phase resistor unit W2 has a plurality of resistor groups and a cooling section that supplies cooling air to the plurality of resistor groups. The resistor group of the first W-phase resistor unit W1 and the resistor group of the second W-phase resistor unit W2 are connected in series, but the resistor group of the first W-phase resistor unit W1 and the resistor group of the second W-phase resistor unit W2 may be connected in parallel. Power is supplied from the T-phase terminal of the test target power supply 100 via the first circuit breaker D1 and the first circuit breaker device 15 to the resistor groups of the first W-phase resistor unit W1 and the second W-phase resistor unit W2. Power is supplied to the cooling sections of the first W-phase resistor unit W1 and the second W-phase resistor unit W2 from an auxiliary power supply separate from the power supply 100 under test. However, power from the test target power supply 100 may be supplied to the cooling sections of the first W-phase resistor unit W1 and the second W-phase resistor unit W2.

[0082] The first U-phase resistor unit U1, the first V-phase unit V1, and the first W-phase unit W1 are aligned in the y direction (see FIG. 6). The first U-phase resistor unit U1 and the second U-phase resistor unit U2 are aligned in the x direction, with an insulator F provided therebetween (see FIG. 7). The first V-phase resistor unit V1 and the second V-phase resistor unit V2 are aligned in the x direction, with an insulator provided therebetween. The first W-phase resistor unit W1 and the second W-phase resistor unit W2 are aligned in the x direction, with an insulator provided between them.

[0083] The length of the eleventh casing H11 in the y direction is defined as a first length k1, the distance in the y direction between the retaining frame UR11a of the first U-phase resistor group UR11 and the twelfth casing H12 is defined as a second length k2, and the distance in the y direction between the retaining frame UR11a of the first U-phase resistor group UR11 and the retaining frame of the first V-phase resistor group VR11 is defined as a third length k3, The distance in the y direction between the retaining frame of the first V-phase resistor group VR11 and the retaining frame of the first W-phase resistor group WR11 is defined as a fourth length k4, the distance in the y direction between the retaining frame of the first W-phase resistor group WR11 and the twelfth housing H12 is defined as a fifth length k5, and the dimensions in the x and y directions of the retaining frame UR11a of the first U-phase resistor group UR11, the retaining frame of the first V-phase resistor group VR11, and the retaining frame of the first W-phase resistor group WR11 are defined as a tenth length k10. In addition, the distance in the x direction between the retaining frame UR11a of the first U phase resistor group UR11 and the 12th casing H12 is defined as an 11th length k11, the distance in the x direction between the retaining frame UR11a of the first U phase resistor group UR11 and the retaining frame of the second U phase resistor group UR12 is defined as a 12th length k12, and the distance in the x direction between the retaining frame of the second U phase resistor group UR12 and the 12th casing H12 is defined as a 13th length k13. In addition, the z-direction dimension of the first U-phase resistor unit U1 (the sum of the heights of the first U-phase cooling section UC11, the first mounting bracket F1, the insulator F, and the retaining frame of the first U-phase resistor group UR11) is defined as the 21st length k21, and the z-direction distance between the top surface of the retaining frame UR11a of the first U-phase resistor group UR11 and the top surface of the 12th housing H12 is defined as the 22nd length k22.

[0084] For example, if the first length k1 is 860 mm, the second length k2 is 400 mm, the third length k3 is 900 mm, the fourth length k4 is 400 mm, the fifth length k5 is 200 mm, and the tenth length k10 is 1050 mm, then the sum of the y-direction dimension of the eleventh housing H11 and the y-direction dimension of the twelfth housing H12 (the twentieth length k20) will be approximately 6000 mm. If the eleventh length k11 is 50 mm, the twelfth length k12 is 200 mm, the thirteenth length k13 is 50 mm, and the tenth length k10 is 1050 mm, then the dimension in the x direction of the twelfth housing H12 (the thirtieth length k30) is approximately 2400 mm. If the twenty-first length k21 is 2000 mm and the twenty-second length k22 is 500 mm, the dimension in the z direction of the twelfth housing H12 (the fortieth length k40) is approximately 2500 mm.

[0085] (Effect of changing the spacing of the resistor group retaining frames) It is possible to use 20-foot containers as the 11th housing H11 and the 12th housing H12 while maintaining sufficient electrical isolation between each of the resistor groups and the housing, i.e., it is possible to store the first load testing section B1 in the 20-foot container. Furthermore, it becomes possible for a worker to enter an area where the gap in the y direction is large, such as between the first U-phase resistor unit U1 and the first V-phase resistor unit V1, and perform work such as maintenance.

[0086] (First control device 11) The first control device 11 includes a switching device 11a, and performs on / off control of the power supply from the test target power supply 100 to the six resistor units of the first load testing section B1. The switching device 11a of the first control device 11 controls the on / off of the power supply to each of the six resistance units of the first load testing section B1, or controls the on / off of the power supply to each of the multiple resistor groups provided in each of the six resistance units of the first load testing section B1. The first control device 11 is supplied with power from an auxiliary power supply separate from the test target power supply 100 . However, the first control device 11 may be supplied with power from the test target power supply 100.

[0087] (First shutoff device 15) The first breaking device 15 includes a VCB, and is connected on the input side to the first breaking section D1, and on the output side to the first U-phase resistor unit U1, the first V-phase resistor unit V1, and the first W-phase resistor unit W1. The first breaking device 15 performs on / off control of power supply to at least the resistor units connected to the first breaking device 15 (the first U-phase resistor unit U1, the first V-phase resistor unit V1, and the first W-phase resistor unit W1).

[0088] (Second load test section B2) The second load testing section B2 includes six resistance units (third U phase resistance unit U3, fourth U phase resistance unit U4, third V phase resistance unit V3, fourth V phase resistance unit V4, third W phase resistance unit W3, and fourth W phase resistance unit W4), a control section (second control device 12), and a breaking device (second breaking device 16).

[0089] Each of the third U-phase resistor unit U3 and the fourth U-phase resistor unit U4 has a plurality of resistor groups and a cooling section that supplies cooling air to the plurality of resistor groups. The resistor group of the third U-phase resistor unit U3 and the resistor group of the fourth U-phase resistor unit U4 are connected in series, however, the resistor group of the third U-phase resistor unit U3 and the resistor group of the fourth U-phase resistor unit U4 may be connected in parallel. Power is supplied from the R-phase terminal of the test target power supply 100 via the first circuit breaker D1 and the second circuit breaker 16 to the resistor groups of the third U-phase resistor unit U3 and the fourth U-phase resistor unit U4. The cooling sections of the third U-phase resistor unit U3 and the fourth U-phase resistor unit U4 are supplied with power from an auxiliary power supply separate from the power supply 100 under test. However, power from the test target power supply 100 may be supplied to the cooling sections of the third U-phase resistor unit U3 and the fourth U-phase resistor unit U2.

[0090] In the third embodiment described later, the resistor group of the 3U phase resistor unit U3 is described as a 13U phase resistor group UR13, the cooling section of the 3U phase resistor unit U3 is described as a 13U phase cooling section UC13, and the cooling fan of the 13U phase cooling section UC13 is described as a 13U phase cooling fan UF13.

[0091] Each of the third V-phase resistor unit V3 and the fourth V-phase resistor unit V4 has a plurality of resistor groups and a cooling section that supplies cooling air to the plurality of resistor groups. The resistor group of the third V-phase resistor unit V3 and the resistor group of the fourth V-phase resistor unit V4 are connected in series, however, the resistor group of the third V-phase resistor unit V3 and the resistor group of the fourth V-phase resistor unit V4 may be connected in parallel. Power is supplied from the S-phase terminal of the test target power supply 100 via the first circuit breaker D1 and the second circuit breaker device 16 to the resistor groups of the third V-phase resistor unit V3 and the fourth V-phase resistor unit V4. Power is supplied from an auxiliary power supply separate from power supply 100 under test to the cooling sections of third V-phase resistor unit V3 and fourth V-phase resistor unit V4. However, power from the test target power supply 100 may be supplied to the cooling sections of the third V-phase resistor unit V3 and the fourth V-phase resistor unit V2.

[0092] In the third embodiment described later, the resistor group of the third V-phase resistor unit V3 is described as a 13V-phase resistor group VR13, the cooling section of the third V-phase resistor unit V3 is described as a 13V-phase cooling section VC13, and the cooling fan of the 13V-phase cooling section VC13 is described as a 13V-phase cooling fan VF13.

[0093] Each of the third W-phase resistor unit W3 and the fourth W-phase resistor unit W4 has a plurality of resistor groups and a cooling section that supplies cooling air to the plurality of resistor groups. The resistor group of the third W-phase resistor unit W3 and the resistor group of the fourth W-phase resistor unit W4 are connected in series, but the resistor group of the third W-phase resistor unit W3 and the resistor group of the fourth W-phase resistor unit W4 may be connected in parallel. Power is supplied from the T-phase terminal of the test target power supply 100 via the first circuit breaker D1 and the second circuit breaker 16 to the resistor groups of the third W-phase resistor unit W3 and the fourth W-phase resistor unit W4. Power is supplied to the cooling sections of the third W-phase resistor unit W3 and the fourth W-phase resistor unit W4 from an auxiliary power supply separate from the power supply 100 under test. However, power from the test target power supply 100 may be supplied to the cooling sections of the third W-phase resistor unit W3 and the fourth W-phase resistor unit W2.

[0094] In the third embodiment described later, the resistor group of the third W-phase resistor unit W3 is described as a 13th W-phase resistor group WR13, the cooling section of the third W-phase resistor unit W3 is a 13th W-phase cooling section WC13, and the cooling fan of the 13th W-phase cooling section WC13 is a 13th W-phase cooling fan WF13.

[0095] The third U-phase resistor unit U3, the third V-phase unit V3, and the third W-phase unit W3 are aligned in the y direction. The third U-phase resistor unit U3 and the fourth U-phase resistor unit U4 are aligned in the x direction, with an insulator provided therebetween. The third V-phase resistor unit V3 and the fourth V-phase resistor unit V4 are aligned in the x direction, with an insulator provided therebetween. The third W-phase resistor unit W3 and the fourth W-phase resistor unit W4 are aligned in the x direction, with an insulator provided between them.

[0096] (Second control device 12) The second control device 12 is a switching device 12a and controls on / off of the power supply from the test target power supply 100 to the six resistor units of the second load testing section B2. The switching device 12a of the second control device 12 controls the on / off of the power supply to each of the six resistance units of the second load testing section B2, or controls the on / off of the power supply to each of the multiple resistor groups provided in each of the six resistance units of the second load testing section B2. The second control device 12 is supplied with power from an auxiliary power supply separate from the test subject power supply 100 . However, power may be supplied from the test target power supply 100 to the second control device 12.

[0097] (Second shutoff device 16) The second breaking device 16 includes a VCB, and is connected on the input side to the first breaking section D1, and is connected on the output side to the third U-phase resistor unit U3, the third V-phase resistor unit V3, and the third W-phase resistor unit W3. The second breaking device 16 performs on / off control of power supply to at least the resistor units connected to the second breaking device 16 (the third U-phase resistor unit U3, the third V-phase resistor unit V3, and the third W-phase resistor unit W3).

[0098] (Positional relationship of each part) The first load testing section B1 has an eleventh housing H11 and a twelfth housing H12. The eleventh housing H11 includes the first control device 11 and the first shutoff device 15. The twelfth case H12 includes a first U-phase resistor unit U1, a second U-phase resistor unit U2, a first V-phase resistor unit V1, a second V-phase resistor unit V2, a first W-phase resistor unit W1, and a second W-phase resistor unit W2. However, the switching device 11a of the first control device 11 may be included in the twelfth housing H12. The surface of the 12th housing H12 facing the 22nd housing H22 and the surface of the 22nd housing H22 facing the 12th housing H12 may be open.

[0099] The second load testing section B2 has a twenty-first housing H21 and a twenty-second housing H22. The twenty-first housing H21 includes the second control device 12 and the second shutoff device 16. The twenty-second housing H22 includes a third U-phase resistor unit U3, a fourth U-phase resistor unit U4, a third V-phase resistor unit V3, a fourth V-phase resistor unit V4, a third W-phase resistor unit W3, and a fourth W-phase resistor unit W4. However, the switching device 12a of the second control device 12 may be included in the twenty-second housing H22.

[0100] The various parts are arranged in a positional relationship such that an area including the first circuit breaker 15 (11th housing H11) and an area including the resistance units of the second load testing section B2 (22nd housing H22) sandwich an area including the six resistance units of the first load testing section B1 (12th housing H12). The various parts are arranged in a positional relationship in which the area including the resistance unit of the first load testing section B1 (12th housing H12) and the area including the second circuit breaker 16 (21st housing H21) sandwich the area including the six resistance units of the second load testing section B2 (22nd housing H22).

[0101] The eleventh housing H11 may include the second control device 12 and the second shutoff device 16. In this case, the various parts are arranged in a positional relationship in which the area including the first circuit breaker 15 and the second circuit breaker 16 (11th housing H11) and the area including the resistance units of the second load testing section B2 (22nd housing H22) sandwich the area including the six resistance units of the first load testing section B1 (12th housing H12).

[0102] (Power storage unit BT) When the separate auxiliary power supply is not provided and the 11U phase cooling fan UF11 of the 11U phase cooling unit UC11 is driven by power from the test target power supply 100, it is desirable to provide a power storage unit BT in the first load testing device A1. The power storage unit BT stores power from the power supply 100 under test, and drives the cooling fan (eg, the 11th U-phase cooling fan UF11) of the first load testing device A1 when the power supply from the power supply 100 under test is cut off. In the first embodiment, an example in which first breaking device 15 and second breaking device 16 are provided with power storage unit BT will be described.

[0103] It is possible to drive each section of the load testing device using power from the power supply 100 under test, without providing an auxiliary power supply separate from the power supply 100 under test. In particular, since the power from the test target power supply 100 is stored in the power storage unit, it is possible to stably drive the cooling fan and the like even when the power supply from the test target power supply 100 is cut off, such as when controlling the on / off of the test target power supply 100 during a load test.

[0104] (Third load test section B3, etc.) The configurations of the third load testing section B3, the fifth load testing section B5, the seventh load testing section B7, the ninth load testing section B9, the eleventh load testing section B11, the thirteenth load testing section B13, the fifteenth load testing section B15, the seventeenth load testing section B17, the nineteenth load testing section B19, the twenty-first load testing section B21, and the twenty-third load testing section B23 are the same as the configuration of the first load testing section B1.

[0105] However, the first interrupting devices of the seventh load testing section B7, the ninth load testing section B9 and the eleventh load testing section B11 are connected to the second interrupting section D2. Further, the first interrupting devices of the thirteenth load testing section B13, the fifteenth load testing section B15 and the seventeenth load testing section B17 are connected to the third interrupting section D3. Moreover, the first interrupting devices of the nineteenth load testing section B19, the twenty-first load testing section B21 and the twenty-third load testing section B23 are connected to the fourth interrupting section D4.

[0106] (4th load test section B4, etc.) The configurations of the fourth load testing section B4, the sixth load testing section B6, the eighth load testing section B8, the tenth load testing section B10, the twelfth load testing section B12, the fourteenth load testing section B14, the sixteenth load testing section B16, the eighteenth load testing section B18, the twentieth load testing section B20, the twenty-second load testing section B22, and the twenty-fourth load testing section B24 are the same as the configuration of the second load testing section B2.

[0107] However, the second circuit breaking devices of the eighth load testing section B8, the tenth load testing section B10 and the twelfth load testing section B12 are connected to the second circuit breaking section D2. Further, the second circuit breaking devices of the fourteenth load testing section B14, the sixteenth load testing section B16 and the eighteenth load testing section B18 are connected to the third circuit breaking section D3. Further, the second circuit breaking devices of the twentieth load testing section B20, the twenty-second load testing section B22 and the twenty-fourth load testing section B24 are connected to the fourth circuit breaking section D4.

[0108] The load test system 1 of the first embodiment includes a first load test device A1 having a first load test section B1 including a first U-phase resistor unit U1, a second U-phase resistor unit U2, a first V-phase resistor unit V1, a second V-phase resistor unit V2, a first W-phase resistor unit W1, a second W-phase resistor unit W2, and a first interrupter 15, a second load test section B2 including a third U-phase resistor unit U3, a fourth U-phase resistor unit U4, a third V-phase resistor unit V3, a fourth V-phase resistor unit V4, a third W-phase resistor unit W3, and a fourth W-phase resistor unit W4, and a load test device (a second load test device A2 to a twelfth load test device A12) corresponding to the first load test device A1. That is, the load test system 1 of the first embodiment includes a plurality of sets of load test devices corresponding to the first load test device A1. In multiple load testing apparatuses, power is supplied from the test target power supply 100 to the first U-phase resistor unit U1, the second U-phase resistor unit U2, the first V-phase resistor unit V1, the second V-phase resistor unit V2, the first W-phase resistor unit W1, and the second W-phase resistor unit W2 via a circuit breaker section (such as the first circuit breaker section D1) separate from the first load testing section B1, and a first circuit breaker device 15. In addition, power is supplied from the test target power supply 100 to the third U-phase resistor unit U3, the fourth U-phase resistor unit U4, the third V-phase resistor unit V3, the fourth V-phase resistor unit V4, the third W-phase resistor unit W3, and the fourth W-phase resistor unit W4 via a circuit breaker (such as the first circuit breaker D1) and the first circuit breaker device 15 or the second circuit breaker device 16.

[0109] (Effect of having multiple resistance units) By including large capacity resistors in the resistor group of each resistor unit, it becomes possible to safely perform a high voltage load test of the power supply under test 100. In particular, there is no need to step down the voltage of the power from the test target power supply 100 using a transformer or the like. Therefore, compared to load tests that involve stepping down the voltage using a transformer or the like, it is possible to supply power to each load test section using a thin power supply cable. In addition, compared to configurations that involve stepping down using a transformer or the like, it becomes possible to perform load testing under conditions that are closer to actual use. In addition, the first load test section B1 to the 24th load test section B 24 can be used for separate stress tests or can be used for a combined stress test as described above.

[0110] (Application example of wiring, second embodiment) In the first embodiment, an example has been described in which power is supplied from the test target power supply 100 to the first U-phase resistor unit U1, the first V-phase resistor unit V1, and the first W-phase resistor unit W1 via the first breaking device 15, and power is supplied from the test target power supply 100 to the third U-phase resistor unit U3, the third V-phase resistor unit V3, and the third W-phase resistor unit W3 via the second breaking device 16. However, power may be supplied from the test target power supply 100 to the first U-phase resistor unit U1, the first V-phase resistor unit V1, the first W-phase resistor unit W1, the third U-phase resistor unit U3, the third V-phase resistor unit V3, and the third W-phase resistor unit W3 via the first breaking device 15 (second embodiment, see Figures 8 and 9). In this case, the power supply cables from the first breaking device 15 to the third U-phase resistor unit U3, the third V-phase resistor unit V3, and the third W-phase resistor unit W3 can be passed inside the twelfth housing H12 and the twenty-second housing H22, thereby reducing the number of cables visible from the outside. In the second embodiment, the second shutoff device 16 may be omitted.

[0111] (Application example of wiring, third embodiment) In the second embodiment, an example has been described in which the first control device 11 performs on / off control of the power supply from the test target power supply 100 to the six resistance units of the first load testing section B1, and the second control device 12 performs on / off control of the power supply from the test target power supply 100 to the six resistance units of the second load testing section B2. However, the first control device 11 may also perform on / off control of the power supply from the test target power supply 100 to the six resistance units of the first load testing section B1, and the power supply from the test target power supply 100 to the six resistance units of the second load testing section B2 (third embodiment, see Figures 10 to 12). In this case, the control unit C1 2nd Control signal cables to the 3U-phase resistor unit U3, the 4U-phase resistor unit U4, the 3rd V-phase resistor unit V3, the 4th V-phase resistor unit V4, the 3rd W-phase resistor unit W3 and the 4th W-phase resistor unit W4 can be passed through the inside of the 12th housing H12 and the 22nd housing H22, thereby reducing the number of cables visible from the outside. In the third embodiment, the second control device 12 may be omitted. Furthermore, the twenty-first housing H21 may also be omitted.

[0112] The length of the eleventh casing H11 in the y direction is a first length k1, the distance in the y direction between the holding frame UR11a of the first resistor group UR11 and the twelfth casing H12 is a second length k2, the distance in the y direction between the holding frame UR11a of the first U-phase resistor group UR11 and the holding frame of the first V-phase resistor group VR11 is a third length k3, the distance in the y direction between the holding frame of the first V-phase resistor group VR11 and the holding frame of the first W-phase resistor group WR11 is a fourth length k4, the distance in the y direction between the holding frame of the first W-phase resistor group WR11 and the holding frame of the third U-phase resistor group UR13 is a fifth length k5, and the distance in the y direction between the holding frame of the third U-phase resistor group UR13 and the holding frame of the third V-phase resistor group The distance in the y direction from the retaining frame of VR13 is defined as a sixth length k6, the distance in the y direction between the retaining frame of the third V-phase resistor group VR13 and the retaining frame of the third W-phase resistor group WR13 is defined as a seventh length k7, the distance in the y direction between the retaining frame of the third W-phase resistor group WR13 and the 22nd housing H22 is defined as an eighth length k8, and the dimensions in the x and y directions of the retaining frame UR11a of the 1st U-phase resistor group UR11, the retaining frame of the 1st V-phase resistor group VR11, the retaining frame of the 1st W-phase resistor group WR11, the retaining frame of the 3rd U-phase resistor group UR13, the retaining frame of the 3rd V-phase resistor group VR13, and the retaining frame of the 3rd W-phase resistor group WR13 are defined as a tenth length k10.

[0113] For example, if the first length k1 is 860 mm, the second length k2 is 400 mm, the third length k3 is 900 mm, the fourth length k4 is 400 mm, the fifth length k5 is 900 mm, the sixth length k6 is 900 mm, the seventh length k7 is 900 mm, the eighth length k8 is 300 mm, and the tenth length k10 is 1050 mm, then the sum of the y-direction dimension of the eleventh housing H11, the y-direction dimension of the twelfth housing H12, and the y-direction dimension of the twenty-second housing H22 (the fiftieth length k50) will be approximately 12,000 mm. That is, in this example, the area including the first U-phase resistor unit U1, the second U-phase resistor unit U2, the first V-phase resistor unit V1, the second V-phase resistor unit V2, the first W-phase resistor unit W1, and the second W-phase resistor unit W2 is disposed between the area including the first breaking device 15 and the area including the third U-phase resistor unit U3, the fourth U-phase resistor unit U4, the third V-phase resistor unit V3, the fourth V-phase resistor unit V4, the third W-phase resistor unit W3, and the fourth W-phase resistor unit W4, and the y-direction distance (third length k3) between the first U-phase resistor unit U1 and the first V-phase resistor unit V1 and the y-direction distance (fifth length k5) between the first W-phase resistor unit W1 and the third U-phase resistor unit U3 are greater than the y-direction distance (fourth length k4) between the first V-phase resistor unit V1 and the first W-phase resistor unit W1. In this case, it is possible to use a 40-foot container as the 11th housing H11, the 12th housing H12, and the 22nd housing H22, while maintaining sufficient electrical isolation between each of the resistor groups and the housing, i.e., it is possible to store the first load testing device A1 in the 40-foot container. Furthermore, it becomes possible for a worker to enter an area where the gap in the y direction is large, such as between the first U-phase resistor unit U1 and the first V-phase resistor unit V1, and perform work such as maintenance.

[0114] (Application example of resistor unit arrangement, fourth embodiment) In the first to third embodiments, an example in which two resistor units are arranged in the x direction has been described. However, there may be only one resistor unit arranged in the x direction (fourth embodiment, see FIGS. 13 to 15). The first load testing section B1 of the fourth embodiment has a first U-phase resistor unit U1, a second U-phase resistor unit U2, a first V-phase resistor unit V1, a second V-phase resistor unit V2, a first W-phase resistor unit W1, and a second W-phase resistor unit W2. The second load testing section B2 of the fourth embodiment has a third U-phase resistor unit U3, a third V-phase resistor unit V3, and a third W-phase resistor unit W3. In the first load testing apparatus A1 of the fourth embodiment, the first U-phase resistor unit U1, the first V-phase resistor unit V1, the first W-phase resistor unit W1, the second U-phase resistor unit U2, the second V-phase resistor unit V2, the second W-phase resistor unit W2, the third U-phase resistor unit U3, the third V-phase resistor unit V3, and the third W-phase resistor unit W3 are arranged in a line in the y direction.

[0115] The resistors R of the resistor group in each resistor unit of the fourth embodiment extend in the x direction. The surface perpendicular to the x-direction of the holding frame for the resistor group in each resistor unit, i.e., the surface holding the terminals of resistor R, is desirably detachable from the holding frame and covered with a transparent cover UR11c made of polycarbonate or the like. FIG. 15 shows, in bold, a transparent cover UR11c provided on the yz surface that holds the terminals of the resistors R in the holding frame UR11a of the first U-phase resistor group UR11 of the first U-phase resistor unit U1.

[0116] (Effect of providing a removable transparent cover UR11c) It is possible to prevent dust and other particles from adhering to the tip of the resistor R terminal. Furthermore, even if dust or the like adheres to the surface, it can be easily seen from the outside and can be easily removed.

[0117] The resistor R extending in the x direction in the fourth embodiment is longer than the resistor R extending in the y direction in the first to third embodiments. The cooling section in each resistor unit is provided with two cooling fans in the x direction. For example, in the 11U-phase cooling unit UC11 of the fourth embodiment, two 11U-phase cooling fans UF11a and UF11b are arranged side by side in the x direction. In other words, when viewed from the z direction, the length of resistor R extending in the x direction is approximately equal to the length over which two cooling fans are arranged, and when viewed from the z direction, the length (row width) of the group of resistors arranged in the y direction is approximately equal to the length over which one cooling fan is arranged (the width of the cooling fan in the y direction). By using a resistor R having a length approximately twice that of a normal resistor R, it is possible to effectively utilize the width of the container in the short direction and form a large-capacity resistor unit.

[0118] In the 11U phase cooling section UC11, above the 11U phase cooling fan UF11a in the z direction, on the opposite side to the side where the 11U phase cooling fan UF11b is located, it is desirable to provide a first guide wall UC11a including a slope that guides the cooling air from the 11U phase cooling fan UF11a toward the rotation axis LX of the 11U phase cooling fan UF11a. In the 11U phase cooling section UC11, above the 11U phase cooling fan UF11b in the z direction, on the opposite side to the side on which the 11U phase cooling fan UF11a is located, it is desirable to provide a second guide wall UC11b including a slope that guides the cooling air from the 11U phase cooling fan UF11b toward the rotation axis LX of the 11U phase cooling fan UF11b.

[0119] (Effect of providing guide walls) The direction in which the cooling air flows is controlled, making it easier to supply cooling air to a wide area in which the resistor group including the long resistor R is located.

[0120] The length in the y direction of the 11th casing H11 is defined as the first length k1, the distance in the y direction between the retaining frame UR11a of the first U-phase resistor group UR11 and the 12th casing H12 is defined as the second length k2, the distance in the y direction between the retaining frame of one resistor group adjacent in the y direction and the retaining frame of the other resistor group is defined as the third length k3, the distance in the y direction between the retaining frame of the third W-phase resistor group WR13 and the 22nd casing H22 is defined as the second length k2, the y direction dimension of the retaining frame of each resistor group is defined as the tenth length k10, and the x direction dimension of the retaining frame of each resistor group is defined as the fifteenth length k15. The distance in the x direction between the holding frame UR11a of the first U-phase resistor group UR11 and the twelfth casing H12 is defined as an eleventh length k11.

[0121] For example, if the first length k1 is 1117 mm, the second length k2 is 150 mm, the third length k3 is 150 mm, and the tenth length k10 is 1050 mm, then the sum of the y-direction dimension of the eleventh housing H11, the y-direction dimension of the twelfth housing H12, and the y-direction dimension of the twenty-second housing H22 (the fiftieth length k50) will be approximately 12000 mm. If the eleventh length k11 is 350 mm and the fifteenth length k15 is 1700 mm, the dimension in the x direction of the twelfth housing H12 (the thirtieth length k30) is approximately 2400 mm. In this case, it becomes possible to use 40-foot containers as the eleventh housing H11, the twelfth housing H12, and the twenty-second housing H22 while maintaining sufficient electrical isolation between each of the resistor groups and the housings. In addition, since the resistors R extend in the x direction, there is little need for an operator to get between adjacent resistor groups, and the width in the y direction between adjacent resistor groups is set to be narrow.

[0122] (Example of application of the number of resistor units) In the fourth embodiment, an example has been described in which one load testing device is provided with three U-phase resistance units, three V-phase resistance units, and three W-phase resistance units. However, the number of resistance units provided in one load testing device is not limited to this. For example, a configuration may be considered in which the first load testing section B1 is provided with one U-phase resistance unit, one V-phase resistance unit, and one W-phase resistance unit, and the second load testing section B2 is provided with one U-phase resistance unit, one V-phase resistance unit, and one W-phase resistance unit. Moreover, the second load testing section B2 may be omitted.

[0123] Also, an example has been described in which the U-phase resistor unit, the V-phase resistor unit, and the W-phase resistor unit are configured as separate bodies. That is, the U-phase resistor Group The example in which the holding frame, the holding frame for the V-phase resistor group, and the holding frame for the W-phase resistor group are arranged side by side in the x direction or the y direction has been described. However, the U-phase resistor unit, the V-phase resistor unit, and the W-phase resistor unit may be integrally configured. Specifically, the resistor groups held in one holding frame include a resistor group used as a U-phase resistor group, a resistor group used as a V-phase resistor group, and a resistor group used as a W-phase resistor group. In this case, one cooling section cools the resistor group used as the U-phase resistor group, the resistor group used as the V-phase resistor group, and the resistor group used as the W-phase resistor group in the resistor group held in the single holding frame.

[0124] For this reason, it is possible that each load testing device is provided with only one load testing section, and that one load testing section is composed of one resistance unit (a U-phase resistance unit, a V-phase resistance unit, and a W-phase resistance unit integrated together). That is, power is supplied from the test target power supply 100 to at least one of the resistance units in the one or more resistance units via a cut-off section (such as the first cut-off section D1) separate from the load testing equipment (such as the first load testing equipment A1), the first cut-off device 15, and a switching device of the one or more resistance units (such as the switching device 11a of the first control device 11). For example, the first load testing device A1 is provided with only the first load testing section B1, without the second load testing section B2, and the one load testing section (first load testing section B1) is composed of one resistance unit. In this case, the holding frame may be omitted, and the twelfth housing H12 may be used as a frame for holding the resistor group.

[0125] Furthermore, the test subject power supply 100 is not limited to a three-phase AC power generation device, but may be a single-phase AC power generation device, a DC power generation device, or a storage battery.

[0126] (Application example of wiring, fifth embodiment) In the third embodiment, an example has been described in which the twelfth housing H12 is disposed between the eleventh housing H11 and the twenty-second housing H22. However, the eleventh housing H11 may be disposed between the twelfth housing H12 and the twenty-second housing H22 (fifth embodiment, see FIGS. 16 and 17). The eleventh case H11 of the fifth embodiment includes the first control device 11, the first shutoff device 15, and the second shutoff device 16.

[0127] As in the third embodiment, the first control device 11 controls on and off the power supply from the test target power supply 100 to the six resistance units of the first load testing section B1, and the power supply from the test target power supply 100 to the six resistance units of the second load testing section B2. In the fifth embodiment, the second control device 12 is omitted. Furthermore, the 21st housing H21 is also omitted.

[0128] However, the 11th housing H11 may include a second control device 12, the first control device 11 controlling on / off the power supply from the power supply under test 100 to the six resistance units of the first load testing section B1, and the second control device 12 controlling on / off the power supply from the power supply under test 100 to the six resistance units of the second load testing section B2.

[0129] As in the first embodiment, power is supplied from the power supply under test 100 to the first U-phase resistor unit U1, the first V-phase resistor unit V1, and the first W-phase resistor unit W1 via the first circuit breaker 15, and power is supplied from the power supply under test 100 to the third U-phase resistor unit U3, the third V-phase resistor unit V3, and the third W-phase resistor unit W3 via the second circuit breaker 16. However, as in the third embodiment, power may be supplied from the test target power supply 100 to the first U-phase resistor unit U1, the first V-phase resistor unit V1, the first W-phase resistor unit W1, the third U-phase resistor unit U3, the third V-phase resistor unit V3, and the third W-phase resistor unit W3 via the first breaking device 15. In this case, the second shutoff device 16 may be omitted.

[0130] The length in the y direction of the eleventh casing H11 is a first length k1, the distance in the y direction between the holding frame UR11a of the first U-phase resistor group UR11 and the twelfth casing H12 is a second length k2, the distance in the y direction between the holding frame UR11a of the first U-phase resistor group UR11 and the holding frame of the first V-phase resistor group VR11 is a third length k3, the distance in the y direction between the holding frame of the first V-phase resistor group VR11 and the holding frame of the first W-phase resistor group WR11 is a fourth length k4, and the distance in the y direction between the holding frame of the first W-phase resistor group WR11 and the twelfth casing H12 and the holding frame of the third U-phase resistor group UR13 and the twelfth casing H12 is a fourth length k5. H The distance in the y direction between the retaining frame of the third U-phase resistor group UR13 and the retaining frame of the third V-phase resistor group VR13 is defined as a fifth length k5, the distance in the y direction between the retaining frame of the third U-phase resistor group UR13 and the retaining frame of the third V-phase resistor group VR13 is defined as a sixth length k6, the distance in the y direction between the retaining frame of the third V-phase resistor group VR13 and the retaining frame of the third W-phase resistor group WR13 is defined as a seventh length k7, the distance in the y direction between the retaining frame of the third W-phase resistor group WR13 and the 22nd housing H22 is defined as an eighth length k8, and the dimensions in the x and y directions of the retaining frame UR11a of the 1st U-phase resistor group UR11, the retaining frame of the 1st V-phase resistor group VR11, the retaining frame of the 1st W-phase resistor group WR11, the retaining frame of the 3rd U-phase resistor group UR13, the retaining frame of the 3rd V-phase resistor group VR13, and the retaining frame of the 3rd W-phase resistor group WR13 are defined as a tenth length k10.

[0131] For example, if the first length k1 is 1600 mm, the second length k2 is 275 mm, the third length k3 is 820 mm, the fourth length k4 is 820 mm, the fifth length k5 is 225 mm, the sixth length k6 is 820 mm, the seventh length k7 is 820 mm, the eighth length k8 is 275 mm, and the tenth length k10 is 1050 mm, then the sum of the y-direction dimension of the eleventh housing H11, the y-direction dimension of the twelfth housing H12, and the y-direction dimension of the 22nd housing H22 (the fiftieth length k50) will be approximately 12000 mm. In this case, it becomes possible to use 40-foot containers as the eleventh housing H11, the twelfth housing H12, and the twenty-second housing H22 while maintaining sufficient electrical isolation between each of the resistor groups and the housings. In addition, it becomes possible for a worker to enter between adjacent resistor groups to perform work such as maintenance.

[0132] In particular, it is desirable to set the intervals between adjacent holding frames (third length k3, fourth length k4, sixth length k6, seventh length k7) to about 80% of the length of the holding frame (tenth length k10). In this case, the interval between adjacent holder frames is about 80% of the longitudinal length of resistor R, which is approximately equal to the length of the holder frame.

[0133] (The effect of setting the spacing between the support frames to about 80% of the length of the support frames) While maintaining sufficient electrical isolation, containers of a specified size can be used as the eleventh housing H11, the twelfth housing H12, and the twenty-second housing H22, i.e., the first load testing device A1 can be stored in a container of a specified size, and further, the resistor R extending in the y direction can be easily removed from between the holding frames.

[0134] (Effect of placing the 11th cabinet H11 in the center) By placing an area including the first breaking device 15 (eleventh casing H11) in the center in the y direction, and placing an area including the first U-phase resistance unit U1 etc. (twelfth casing H12) and an area including the third U-phase resistance unit U3 etc. (twelfth casing H22) on either side of it, the longitudinal weight balance of a single container can be improved.

[0135] (Application example of wiring, sixth embodiment) In the first embodiment, an example has been described in which the load testing system 1 has 12 load testing devices (the first load testing device A1 to the twelfth load testing device A12). However, the number of load testing devices included in the load testing system 1 is not limited to this. For example, the load testing system 1 may have 10 load testing devices (the first load testing device A1 to the fifth load testing device A5, the seventh load testing device A7, the eighth load testing device A8, the tenth load testing device A10 to the twelfth load testing device A12) (sixth embodiment, see FIG. 18).

[0136] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents described in the claims, as well as in the scope and spirit of the invention. [Explanation of symbols]

[0137] 1 Load Test System 11 First control device 11a Switching device of first control device 12 Second control device 12a Switching device of second control device 15 First Circuit Breaker 16 Second shutoff device 100 Tested power supply A1~A12 1st load test device~12th load test device B1~B24 1st load test section~24th load test section BT power storage unit C1 Control section D1 to D4: First cut-off section to fourth cut-off section F Insulator F1 First mounting bracket F2 Second mounting bracket F3 3rd mounting bracket H11 11th cabinet H12 12th cabinet H21 21st cabinet H22 22nd Cabinet IB1 First insulating plate IB2 Second insulating plate k1~k8 1st length~8th length k10 10th length k11~k13 11th length~13th length k15 15th length k20 20th length k21, k22 21st length, 22nd length k30 30th length k40 40th length k50 50th length LX Rotating shaft of cooling fan for 11U phase NA Resistor non-placement area R resistor U1 1st U phase resistor unit U2 2nd U phase resistor unit U3 3rd U phase resistor unit U4 4th U phase resistor unit UC11 11U phase cooling unit (1U phase resistor unit cooling unit) UC11a First Guiding Wall UC11b 2nd guide wall UF11 11U phase cooling fan (11U phase cooling unit cooling fan) UF11a, UF11b Two 11U phase cooling fans UF11c Bellmouth UR11 11U phase resistor group (1U phase resistor unit resistor group) UR11a 11U phase resistor group holder UR11b Protrusion of the retaining frame for the 11U-phase resistor group UR11c Transparent cover for the 11U phase resistor group retaining frame UC12 12U phase cooling section (2U phase resistor unit cooling section) UF12 12U phase cooling fan (cooling fan for 12U phase cooling section) UR12 12U-phase resistor group (resistor group for 2U-phase resistor unit) UC13 13U phase cooling unit (3U phase resistor unit cooling unit) UF13 13U phase cooling fan (13U phase cooling unit cooling fan) UR13 13U phase resistor group (resistor group of 3U phase resistor unit) V1 1st V phase resistor unit V2 2nd V phase resistor unit V3 3rd V phase resistor unit V4 4th V phase resistor unit VC11 11th V phase cooling section (1st V phase resistor unit cooling section) VF11 11V phase cooling fan (11V phase cooling section cooling fan) VR11 11V phase resistor group (1V phase resistor unit resistor group) VC13 13V phase cooling section (cooling section for 3V phase resistor unit) VF13 13V phase cooling fan (13V phase cooling section cooling fan) VR13 13V phase resistor group (resistor group for 3V phase resistor unit) W1 1st W phase resistor unit W2 2nd W phase resistor unit W3 3rd W phase resistor unit W4 4th W phase resistor unit WC11 11th W-phase cooling section (1st W-phase resistance unit cooling section) WF11 11V phase cooling fan (11W phase cooling section cooling fan) WR11 11W phase resistor group (1W phase resistor unit resistor group) WC13 13W phase cooling section (3W phase resistor unit cooling section) WF13 13W phase cooling fan (13W phase cooling unit cooling fan) WR13 13W phase resistor group (3W phase resistor unit resistor group)

Claims

1. a plurality of sets of load testing apparatuses each having a first load testing section including one or more resistance units and a first interrupting device; power supply from a test target power source to at least one of the one or more resistor units is performed at least via a breaker unit separate from the load testing apparatus and the first breaker device; the cutoff unit performs on / off control of power supply to at least one of the plurality of sets of load testing devices; A load testing system, wherein the first shutoff device controls on / off of power supply to at least one of the one or more resistance units that is connected to the first shutoff device.

2. the one or more resistor units include a first U-phase resistor unit, a second U-phase resistor unit, a third U-phase resistor unit, a first V-phase resistor unit, a second V-phase resistor unit, a third V-phase resistor unit, a first W-phase resistor unit, a second W-phase resistor unit, and a third W-phase resistor unit; the load testing apparatus has a first load testing section including the first U-phase resistor unit, the second U-phase resistor unit, the first V-phase resistor unit, the second V-phase resistor unit, the first W-phase resistor unit, the second W-phase resistor unit, and the first interrupting device, and a second load testing section including the third U-phase resistor unit, the third V-phase resistor unit, and the third W-phase resistor unit, power supply from the test power source to the first U-phase resistor unit, the second U-phase resistor unit, the first V-phase resistor unit, the second V-phase resistor unit, the first W-phase resistor unit, and the second W-phase resistor unit is performed via at least the interrupter and the first interrupter device; 2. The load testing system of claim 1, wherein power supply from the test target power supply to the third U-phase resistor unit, the third V-phase resistor unit, and the third W-phase resistor unit is performed at least via the cut-off unit and a second cut-off device provided in the first cut-off device or the second load testing unit.

3. the resistors in each resistor group of the one or more resistor units extend in an x-direction; the first U-phase resistor unit, the second U-phase resistor unit, the third U-phase resistor unit, the first V-phase resistor unit, the second V-phase resistor unit, the third V-phase resistor unit, the first W-phase resistor unit, the second W-phase resistor unit, and the third W-phase resistor unit are arranged in a y direction perpendicular to the x direction, 3. The load testing system according to claim 2, wherein a surface of a holding frame that holds a resistor group of each of the one or more resistor units and that holds terminals of the resistors is covered with a removable transparent cover.

4. the resistors in each resistor group of the one or more resistor units extend in an x-direction; the first U-phase resistor unit, the second U-phase resistor unit, the third U-phase resistor unit, the first V-phase resistor unit, the second V-phase resistor unit, the third V-phase resistor unit, the first W-phase resistor unit, the second W-phase resistor unit, and the third W-phase resistor unit are arranged in a y direction perpendicular to the x direction, At least the first U-phase resistor unit includes a cooling unit that cools the resistor group of the first U-phase resistor unit, The cooling portion of the first U-phase resistor unit includes two cooling fans arranged in the x direction, The cooling portion of the first U-phase resistor unit is provided with a guide wall including a slope, 3. The load testing system of claim 2, wherein the guide wall guides cooling air from one of the cooling fans toward one of the rotation shafts of the cooling fans and guides cooling air from the other of the cooling fans toward the other rotation shaft of the cooling fans.

5. the one or more resistor units include the first U-phase resistor unit, the second U-phase resistor unit, the third U-phase resistor unit, a fourth U-phase resistor unit, the first V-phase resistor unit, the second V-phase resistor unit, the third V-phase resistor unit, a fourth V-phase resistor unit, the first W-phase resistor unit, the second W-phase resistor unit, the third W-phase resistor unit, and a fourth W-phase resistor unit, the first U-phase resistor unit and the second U-phase resistor unit are arranged in an x-direction, the first V-phase resistor unit and the second V-phase resistor unit are arranged in the x-direction, the first W-phase resistor unit and the second W-phase resistor unit are aligned in the x-direction, the third U-phase resistor unit and the fourth U-phase resistor unit are aligned in the x-direction, the third V-phase resistor unit and the fourth V-phase resistor unit are arranged in the x-direction, the third W-phase resistor unit and the fourth W-phase resistor unit are aligned in the x-direction, the first U-phase resistor unit, the first V-phase resistor unit, the first W-phase resistor unit, the third U-phase resistor unit, the third V-phase resistor unit, and the third W-phase resistor unit are arranged in a y direction perpendicular to the x direction, the second U-phase resistor unit, the second V-phase resistor unit, the second W-phase resistor unit, the fourth U-phase resistor unit, the fourth V-phase resistor unit, and the fourth W-phase resistor unit are aligned in the y direction, a region including the first U-phase resistor unit, the second U-phase resistor unit, the first V-phase resistor unit, the second V-phase resistor unit, the first W-phase resistor unit, and the second W-phase resistor unit is disposed between a region including the first cutoff device and a region including the third U-phase resistor unit, the fourth U-phase resistor unit, the third V-phase resistor unit, the fourth V-phase resistor unit, the third W-phase resistor unit, and the fourth W-phase resistor unit, 3. The load testing system of claim 2, wherein the y-direction distance between the first U-phase resistor unit and the first V-phase resistor unit, and the y-direction distance between the first W-phase resistor unit and the third U-phase resistor unit are greater than the y-direction distance between the first V-phase resistor unit and the first W-phase resistor unit.

6. the one or more resistor units include the first U-phase resistor unit, the second U-phase resistor unit, the third U-phase resistor unit, a fourth U-phase resistor unit, the first V-phase resistor unit, the second V-phase resistor unit, the third V-phase resistor unit, a fourth V-phase resistor unit, the first W-phase resistor unit, the second W-phase resistor unit, the third W-phase resistor unit, and a fourth W-phase resistor unit, the first U-phase resistor unit and the second U-phase resistor unit are arranged in an x-direction, the first V-phase resistor unit and the second V-phase resistor unit are arranged in the x-direction, the first W-phase resistor unit and the second W-phase resistor unit are aligned in the x-direction, the third U-phase resistor unit and the fourth U-phase resistor unit are aligned in the x-direction, the third V-phase resistor unit and the fourth V-phase resistor unit are arranged in the x-direction, the third W-phase resistor unit and the fourth W-phase resistor unit are aligned in the x-direction, the first U-phase resistor unit, the first V-phase resistor unit, the first W-phase resistor unit, the third U-phase resistor unit, the third V-phase resistor unit, and the third W-phase resistor unit are arranged in a y direction perpendicular to the x direction, the second U-phase resistor unit, the second V-phase resistor unit, the second W-phase resistor unit, the fourth U-phase resistor unit, the fourth V-phase resistor unit, and the fourth W-phase resistor unit are aligned in the y direction, the resistors of the resistor groups in each of the first U-phase resistor unit, the second U-phase resistor unit, the third U-phase resistor unit, the fourth U-phase resistor unit, the first V-phase resistor unit, the second V-phase resistor unit, the third V-phase resistor unit, the fourth V-phase resistor unit, the first W-phase resistor unit, the second W-phase resistor unit, the third W-phase resistor unit, and the fourth W-phase resistor unit extend in the y direction, 3. The load testing system of claim 2, wherein the distance between a holding frame that holds the resistor group in the first U-phase resistor unit and a holding frame that holds the resistor group in the first V-phase resistor unit, the distance between the holding frame of the first V-phase resistor unit and a holding frame that holds the resistor group in the first W-phase resistor unit, the distance between a holding frame that holds the resistor group in the third U-phase resistor unit and a holding frame that holds the third V-phase resistor group, and the distance between the holding frame of the third V-phase resistor group and a holding frame that holds the resistor group in the third W-phase resistor unit are 80% of the width in the y direction of the holding frame of the first U-phase resistor unit.

7. 7. The load testing system of claim 5, wherein an area including the first cutting device is arranged between an area including the first U-phase resistor unit, the second U-phase resistor unit, the first V-phase resistor unit, the second V-phase resistor unit, the first W-phase resistor unit, and the second W-phase resistor unit, and an area including the third U-phase resistor unit, the fourth U-phase resistor unit, the third V-phase resistor unit, the fourth V-phase resistor unit, the third W-phase resistor unit, and the fourth W-phase resistor unit.

8. Each of the one or more resistance units includes a resistor group, a holding frame that holds the resistor group, and a cooling unit that cools the resistor group; The resistor group includes a plurality of resistors, the plurality of resistors are arranged at least in a first direction perpendicular to a direction in which the cooling unit and the holding frame are arranged, 2. The load testing system of claim 1, wherein in an area including a line along which a rotation axis of a cooling fan of the cooling section extends and a center in the first direction of the area in which the plurality of resistors are arranged, the resistors are arranged with wider intervals between each other than in other areas in which the plurality of resistors are arranged.

9. Each of the one or more resistor units includes a holding frame that holds the resistor group; 2. The load testing system according to claim 1, wherein an inner wall of the holding frame is formed with protrusions for diffusing cooling air.

10. Each of the one or more resistor units includes a holding frame that holds the resistor group and a cooling unit that cools the resistor group; The cooling unit includes a plurality of cooling fans. The load testing system of claim 1 , wherein the plurality of cooling fans are arranged at an angle with respect to a plane perpendicular to the direction in which the cooling section and the holding frame are arranged so that the cooling air collides in an area including the group of resistors.

11. 2. The load testing system according to claim 1, further comprising a control unit that is wired to each of the plurality of sets of the load testing devices and transmits a control signal to each of the plurality of sets of the load testing devices.

12. Each of the one or more resistance units includes a cooling unit that cools the resistor group; the cooling unit includes a cooling fan that is driven by power from the test target power supply, The first circuit breaking device is provided with a power storage unit that stores power from the test target power source, 2. The load testing system according to claim 1, wherein the power storage unit drives the cooling fan when the power supply from the test target power supply is cut off.

13. the plurality of sets of load testing devices include at least a first load testing device, a second load testing device, a third load testing device, a fourth load testing device, and a fifth load testing device; The interrupting portion has at least a first interrupting portion and a second interrupting portion, power supply from the test target power supply to the first load testing device, the second load testing device and the third load testing device is performed via at least the first cutoff unit; 2. The load testing system according to claim 1, wherein power supply from the test target power supply to the fourth load testing device and the fifth load testing device is performed via at least the second cutoff unit.

14. Each of the one or more resistor units includes a resistor group, a holding frame that holds the resistor group, a cooling unit that cools the resistor group, and an insulator provided between the holding frame and the cooling unit, The insulator and the cooling unit are attached via a first mounting bracket, 2. The load testing system according to claim 1, wherein the insulator and the holding frame are attached via a second mounting bracket separate from the first mounting bracket.

15. Each of the one or more resistor units includes a hood including a first insulating plate and a second insulating plate; the first insulating plate is attached to the cooling section via a third mounting bracket that is different from the first mounting bracket and the second mounting bracket, the second insulating plate is attached to the cooling unit via the first mounting bracket, The load testing system of claim 14 , wherein a tip of the hood is located inside the holding frame.

16. The load testing system according to claim 14 , wherein the cooling section includes a pressure fan type cooling fan including a bell mouth.

17. power supply from the test power source to at least one resistor unit in the one or more resistor units is performed at least via the interrupter, the first interrupter device, and a switching device of the one or more resistor units; The load testing system of claim 1 , wherein the switching device controls on / off the power supply to each of the one or more resistor units, or controls on / off the power supply to each of a plurality of resistor groups provided in each of the one or more resistor units.

18. The one or more resistance units are composed of one resistance unit, 2. The load testing system according to claim 1, wherein each housing of the plurality of sets of the load testing apparatuses holds a group of resistors in the one resistance unit.

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