Load testing device

Abstract

The present invention provides a load testing device capable of efficiently adjusting a power factor.　The load testing device includes: a main reactor part 30 having one or more coil sets each including one or more coils and receiving power from a power source under test 100; a main resistance part 60 having one or more resistor groups each including one or more resistors and receiving power from the power source under test 100; and a first housing 41 that accommodates the one or more coil sets. At least a part of the first housing 41 is formed of a ferromagnetic plate or mesh in order to suppress generation of an eddy current caused by the one or more coil sets.

Description

Load Test Equipment

[0001] The present invention relates to a load testing device.

[0002] Conventionally, a load testing device for performing a load test on a generator has been proposed, as disclosed in Patent Document 1.

[0003] Japanese Patent Application Publication No. 09-15307

[0004] However, power factor adjustment is not considered.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a load testing device that can efficiently adjust the power factor.

[0006] The load testing device according to the present invention comprises a main reactor unit having one or more coil sets each including one or more coils and receiving power from a power supply under test, a main resistor unit having one or more resistor groups each including one or more resistors and receiving power from the power supply under test, and a first housing that houses the one or more coil sets, at least a portion of which is made of a ferromagnetic plate or mesh to suppress the generation of eddy currents due to the one or more coil sets.

[0007] At least the side surface portion of the first housing can be utilized to suppress adverse effects such as eddy currents in the metal surrounding each coil set. Also, at least the side surface portion of the first housing can be utilized to suppress eddy current loss in each coil set. This allows for efficient power factor adjustment during a load test of the power supply under test.

[0008] Preferably, the first housing is mountable on a moving device. When viewed from above, the longitudinal direction of the first housing is the front-to-rear direction of the moving device, and the lateral direction of the first housing is the left-to-right direction of the moving device. Each of the one or more coil sets includes a U-phase coil, a V-phase coil, and a W-phase coil, each of which has a central axis of winding extending in the up-down direction. The reactor unit has a first coil set, a second coil set, a third coil set, and a fourth coil set as the one or more coil sets. The first coil set is located on the front and right side of the first housing. The second coil set is located on the front and left side of the first housing. The third coil set is located on the rear and right side of the first housing. The fourth coil set is located on the rear and left side of the first housing. The U-phase coil, the V-phase coil, and the W-phase coil of each of the first coil set, the second coil set, the third coil set, and the fourth coil set are arranged in the front-rear direction.

[0009] Compared to a configuration in which the U-phase coil, V-phase coil, and W-phase coil are arranged in the x-direction, it is possible to form a passage for the user to pass through between the left and right coil sets in a state that can be mounted on a mobile device such as a trailer.

[0010] More preferably, a gap of 600 mm or more is provided between the first coil set and the second coil set, and a gap of 600 mm or more is provided between the third coil set and the fourth coil set. A rear door for ventilation is provided on the rear surface of the housing.

[0011] More preferably, a front door is provided on the front of the housing. An operation unit and a first circuit breaker are provided in an area including the front door in front of the first coil set and the second coil set. Power is supplied from the power supply under test to the one or more coil sets via the first circuit breaker. Selection of a coil set to be supplied with power from the power supply under test is performed via the operation unit.

[0012] More preferably, the load testing apparatus further includes a fine adjustment coil set including one or more coils used for fine adjustment of the power factor, and a transformer for stepping down the voltage of the power supplied from the power supply under test. The fine adjustment coil set, the transformer, the fine adjustment resistor, and the first fine adjustment switch are arranged outside the first housing. The fine adjustment coil set is covered with a ferromagnetic plate or net to suppress the generation of eddy currents caused by the fine adjustment coil set. Power is supplied from the power supply under test to the fine adjustment coil set via the first circuit breaker, the transformer, and the first fine adjustment switch.

[0013] More preferably, the load testing apparatus further includes a second circuit breaker, a second housing that houses the main resistance unit and the second circuit breaker, a fine adjustment resistance unit having one or more resistor groups each including one or more resistors used for fine adjustment of the load amount, and a second fine adjustment switch. The first circuit breaker and the second circuit breaker are configured as vacuum circuit breakers. The first fine adjustment switch and the second fine adjustment switch are configured as high-voltage vacuum contactors. The fine adjustment resistance unit is disposed outside the first housing and outside the second housing. Power is supplied from the power supply under test to the resistor of the main resistance unit via at least the second circuit breaker. Power is supplied from the power supply under test to the resistor of the fine adjustment resistance unit via at least one of the first circuit breaker and the second circuit breaker and the second fine adjustment switch.

[0014] Preferably, an eleventh switch, a twelfth switch, a twenty-first switch, and a twenty-second switch are provided between the first coil set and the second coil set when viewed from above. The first circuit breaker is a vacuum circuit breaker. The eleventh switch and the twelfth switch are high-voltage AC load switches. The twenty-first switch and the twenty-second switch are high-voltage vacuum contactors. The eleventh switch is connected to the first circuit breaker and the twenty-first switch. The twelfth switch is connected to the first circuit breaker and the twenty-second switch. Power is supplied from the power supply under test to the first coil set via the first circuit breaker, the eleventh switch, and the twenty-first switch. Power is supplied from the power supply under test to the second coil set via the first circuit breaker, the twelfth switch, and the twenty-second switch. When viewed from above, the twenty-first switch is disposed closer to the first coil set than the eleventh switch. When viewed from above, the 22nd switch is disposed closer to the second coil set than the 12th switch.

[0015] The electric wires from the first circuit breaker are arranged above and between the left and right coil sets, facilitating wiring to each coil set.

[0016] Preferably, the load testing apparatus further includes a power generation unit and a power storage unit that stores power obtained by the power generation unit when power is not supplied from the power supply under test to the main resistor unit and the main reactor unit. The power generation unit is provided on at least an upper surface of the first housing. The power storage unit is provided outside the first housing. When power is supplied from the power supply under test to at least one of the main resistor unit and the main reactor unit, power from the power storage unit is supplied to at least a coil cooling unit that cools the one or more coil sets of the main reactor unit and a resistor group cooling unit that cools the one or more resistor groups of the main resistor unit.

[0017] It is possible to drive the electrical devices that make up the load testing device even when there is no external power supply.

[0018] Preferably, the main reactor unit has a coil cooling unit and a guide path made of a non-conductive member that guides cooling air emitted from the coil cooling unit to an area where the one or more coil sets are located. At least a wall is provided between the coil cooling unit and the area where the one or more coil sets are located, and the guide path penetrates the wall.

[0019] (Effect of supplying cooling air from an area separated by a wall) It is possible to omit holes for taking in air from the outside in the side walls of the area where the coil set is located, and it is possible to suppress the adverse effects of eddy currents and the like that may be caused in the metal around the coil set through the holes. By constructing the induction path from a non-conductive material, it is possible to suppress the adverse effects of eddy currents and the like that may be caused in the induction path compared to a configuration in which the induction path is constructed from a conductive material.

[0020] As described above, according to the present invention, it is possible to provide a load testing device that can efficiently adjust the power factor.

[0021] FIG. 1 is a perspective view showing the configuration of a load testing device in a first embodiment; FIG. 2 is a schematic view showing the configuration of a load testing device; FIG. 3 is a top view showing the internal structure of a first housing; FIG. 4 is a left side view showing the internal structure of the first housing; FIG. 5 is a rear view showing the internal structure of the first housing; FIG. 6 is a perspective view of a first coil set and a first coil holding member; FIG. 7 is a perspective view showing the configuration of a load testing device in a second embodiment; FIG. 8 is a top view showing the internal structure of the first housing of the second embodiment; FIG. 9 is a left side view showing the internal structure of the first housing of the second embodiment; and FIG. 10 is a rear view showing the internal structure of the first housing of the second embodiment.

[0022] The first embodiment will be described below with reference to the drawings. Note that the embodiments are not limited to the following embodiments. Furthermore, the content described in one embodiment is, in principle, also applicable to other embodiments. Furthermore, each embodiment and each modified example can be combined as appropriate.

[0023] To explain the directions, one of the horizontal directions will be referred to as the x direction (left-right direction), the horizontal direction perpendicular to the x direction as the y direction (front-back direction), and the vertical direction perpendicular to the x and y directions as the z direction (up-down direction). In Figure 1 and Figures 3 to 6, the directions indicated by the arrows on the x, y, and z axes are defined as the leftward, forward, and upward directions, respectively.

[0024] (Load Testing Apparatus 1) The load testing apparatus 1 in the first embodiment is used to perform a load test on the test target power supply 100, and includes a first load testing area 1a and a second load testing area 1b (see Figures 1 and 2).

[0025] (First Load Test Area 1a) The first load test area 1a has the operation unit 7, the main reactor unit 30, the first housing 41, the first power generation unit 43, the transformer 51, the fine adjustment reactor unit 57, the power storage unit 59, and the fine adjustment resistor unit 67. The first load test area 1a is mounted on a first moving device (not shown), such as a trailer. When viewed from the z direction, the longitudinal direction of the first housing 41 is the front-to-rear direction of the first moving device (y direction), and the lateral direction is the left-to-right direction of the first moving device (x direction).

[0026] (Second Load Test Area 1b) The second load test area 1b has a main resistor 60, a second housing 71, and a second power generation unit 73. The second load test area 1b is mounted, for example, on a second mobile device (not shown) separate from the trailer on which the first load test area 1a is mounted. When viewed from the z direction, the longitudinal direction of the second housing 71 is the front-to-rear direction of the second mobile device (y direction), and the lateral direction is the left-to-right direction of the second mobile device (x direction).

[0027] (Connection Cables for Each Part) Power is supplied from the test subject power supply 100 to the first coil set 37a and other components via the first electric wires 5a. The first electric wires 5a include a U-phase wire UL, a V-phase wire VL, and a W-phase wire WL. The U-phase wire UL is an electric wire extending from the U-phase terminal of the first circuit breaker 31 and is electrically connected to the R-phase terminal of the test subject power supply 100. The V-phase wire VL is an electric wire extending from the V-phase terminal of the first circuit breaker 31 and is electrically connected to the S-phase terminal of the test subject power supply 100. The W-phase wire WL is an electric wire extending from the W-phase terminal of the first circuit breaker 31 and is electrically connected to the T-phase terminal of the test subject power supply 100. For simplicity, in FIGS. 1 , 3 , 4 , and 5 , the first electric wire 5a is represented by a single wire combining the U-phase wire UL, the V-phase wire VL, and the W-phase wire WL.

[0028] Power is supplied from the power storage unit 59 to the first coil cooling required unit 38a and the like via the second electric wire 5b. Signals are transmitted from the operation unit 7 to the 21st switch 35a and the like via the control signal wire 5c.

[0029] (Operation Unit 7) The operation unit 7 includes operation switches for setting the load amount when a load test is performed, the degree of power factor adjustment, etc. When the user operates the operation switches of the operation unit 7, a resistor group and a coil set to which power is to be supplied from the test target power supply 100 are selected, and the corresponding switch (such as the 21st switch 35a) is turned on.

[0030] For example, when a predetermined load amount is set via the operation unit 7, the relays of the resistors corresponding to the predetermined load amount in the first to third resistor groups 63a to 63c and the fine adjustment resistor group 67a are turned on. Also, when a predetermined power factor is set via the operation unit 7, the switches (VCS) of the coil sets corresponding to the predetermined power factor among the first to sixth coil sets 37a to 37f and the fine adjustment coil set 57a are turned on. Note that at least a part of the load amount setting and power factor setting may be performed automatically by a control device included in the load testing apparatus 1.

[0031] In the first embodiment, an example will be described in which the operation unit 7 is provided in the first housing 41, but the operation unit 7 may be provided in the second housing 71. Furthermore, an operation switch for setting the degree of power factor adjustment in the operation unit 7 may be provided in the first housing 41, and an operation switch for setting the load amount in the operation unit 7 may be provided in the second housing 71.

[0032] (Main reactor unit 30) The main reactor unit 30 has a first circuit breaker 31, an eleventh switch 33a to a sixteenth switch 33f, a twenty-first switch 35a to a twenty-sixth switch 35f, a first fine adjustment switch 36, a first coil set 37a to a sixth coil set 37f, and a first coil cooling unit 38a to a sixth coil cooling unit 38f.

[0033] The first circuit breaker 31 is a vacuum circuit breaker (VCB). By switching the first circuit breaker 31 to an interrupted state, the power supply from the test target power supply 100 to the first coil set 37a to the sixth coil set 37f and the fine adjustment coil set 57a is stopped. The first circuit breaker 31 is driven by power supplied from the power storage unit 59.

[0034] The eleventh switch 33a to the sixteenth switch 33f are configured as high-voltage AC load break switches (LBS). Placing the eleventh switch 33a in an interrupted state stops the power supply from the test target power supply 100 to the first coil set 37a. Placing the twelfth switch 33b in an interrupted state stops the power supply from the test target power supply 100 to the second coil set 37b. Placing the thirteenth switch 33c in an interrupted state stops the power supply from the test target power supply 100 to the third coil set 37c. Placing the fourteenth switch 33d in an interrupted state stops the power supply from the test target power supply 100 to the fourth coil set 37d. Placing the fifteenth switch 33e in an interrupted state stops the power supply from the test target power supply 100 to the fifth coil set 37e. Placing the sixteenth switch 33f in an interrupted state stops the power supply from the test target power supply 100 to the sixth coil set 37f. The eleventh switch 33 a to the sixteenth switch 33 f are driven by the power supplied from the power storage unit 59 .

[0035] (21st Switch 35a to 26th Switch 35f) The 21st Switch 35a to 26th Switch 35f are composed of high-voltage vacuum contactors (VCS: Vacuum Circuit Switches). By controlling the on / off state of the 21st Switch 35a, on / off control is performed for the power supply from the test target power supply 100 to the first coil set 37a. By controlling the on / off state of the 22nd Switch 35b, on / off control is performed for the power supply from the test target power supply 100 to the second coil set 37b. By controlling the on / off state of the 23rd Switch 35c, on / off control is performed for the power supply from the test target power supply 100 to the third coil set 37c. By controlling the on / off state of the 24th Switch 35d, on / off control is performed for the power supply from the test target power supply 100 to the fourth coil set 37d. By controlling the on / off state of the 25th Switch 35e, on / off control is performed for the power supply from the test target power supply 100 to the fifth coil set 37e. By controlling the on / off of the 26th switch 35f, the on / off control of the power supply from the test target power supply 100 to the 6th coil set 37f is performed. The 21st switch 35a to the 26th switch 35f are driven by power supplied from the power storage unit 59.

[0036] (First Fine Adjustment Switch 36) The first fine adjustment switch 36 is formed by a high-voltage vacuum contactor (VCS: Vacuum Circuit Switch). By controlling the on / off of the first fine adjustment switch 36, on / off control of the power supply from the test target power supply 100 to the fine adjustment coil set 57a is performed. The first fine adjustment switch 36 is driven by power supplied from the power storage unit 59.

[0037] (First coil set 37a to sixth coil set 37f) The first coil set 37a to sixth coil set 37f are used for main power factor adjustment, and a high voltage is applied to them. Each of the first coil set 37a to sixth coil set 37f includes a U-phase coil, a V-phase coil, and a W-phase coil.

[0038] The central axis of the winding of the U-phase coil of each of the first coil set 37a to the sixth coil set 37f extends in the z direction. The central axis of the winding of the V-phase coil of each of the first coil set 37a to the sixth coil set 37f extends in the z direction. The central axis of the winding of the W-phase coil of each of the first coil set 37a to the sixth coil set 37f extends in the z direction. The U-phase coil, V-phase coil, and W-phase coil of each of the first coil set 37a to the sixth coil set 37f are aligned in the y direction.

[0039] (Positional Relationship of Each Coil Set) The first coil set 37a is located on the right side of the first housing 41 in the x direction and in front of the first housing 41 in the y direction (see FIGS. 3 to 5). The second coil set 37b is located on the left side of the first coil set 37a in the x direction. That is, the second coil set 37b is located on the left side of the first housing 41 in the x direction and in front of the first housing 41 in the y direction. The third coil set 37c is located behind the first coil set 37a in the y direction. That is, the third coil set 37c is located on the right side of the first housing 41 in the x direction and in rear of the first housing 41 in the y direction. The fourth coil set 37d is located on the left side of the third coil set 37c in the x direction and in rear of the second coil set 37b in the y direction. That is, the fourth coil set 37d is located on the left side of the first housing 41 in the x direction and in rear of the first housing 41 in the y direction. The fifth coil set 37e is located behind the third coil set 37c in the y direction. The sixth coil set 37f is located to the left of the fifth coil set 37e in the x direction and behind the fourth coil set 37d in the y direction.

[0040] (First coil set 37a) One terminal of the U-phase coil of the first coil set 37a, one terminal of the V-phase coil of the first coil set 37a, and one terminal of the W-phase coil of the first coil set 37a are short-circuited. The other terminal of the U-phase coil of the first coil set 37a is connected to the U-phase wire UL via the eleventh switch 33a and the twenty-first switch 35a. The other terminal of the V-phase coil of the first coil set 37a is connected to the V-phase wire VL via the eleventh switch 33a and the twenty-first switch 35a. The other terminal of the W-phase coil of the first coil set 37a is connected to the W-phase wire WL via the eleventh switch 33a and the twenty-first switch 35a. The first coil set 37a has, for example, a rated voltage of 6600 V and a reactive power of 500 kvar.

[0041] (Second coil set 37b) One terminal of the U-phase coil of the second coil set 37b, one terminal of the V-phase coil of the second coil set 37b, and one terminal of the W-phase coil of the second coil set 37b are short-circuited. The other terminal of the U-phase coil of the second coil set 37b is connected to the U-phase wire UL via the twelfth switch 33b and the twenties second switch 35b. The other terminal of the V-phase coil of the second coil set 37b is connected to the V-phase wire VL via the twelfth switch 33b and the twenties second switch 35b. The other terminal of the W-phase coil of the second coil set 37b is connected to the W-phase wire WL via the twelfth switch 33b and the twenties second switch 35b. The second coil set 37b has, for example, a rated voltage of 6600 V and a reactive power of 500 kvar.

[0042] (Third coil set 37c) One terminal of the U-phase coil of the third coil set 37c, one terminal of the V-phase coil of the third coil set 37c, and one terminal of the W-phase coil of the third coil set 37c are short-circuited. The other terminal of the U-phase coil of the third coil set 37c is connected to the U-phase wire UL via the 13th switch 33c and the 23rd switch 35c. The other terminal of the V-phase coil of the third coil set 37c is connected to the V-phase wire VL via the 13th switch 33c and the 23rd switch 35c. The other terminal of the W-phase coil of the third coil set 37c is connected to the W-phase wire WL via the 13th switch 33c and the 23rd switch 35c. The third coil set 37c has, for example, a rated voltage of 6600 V and a reactive power of 500 kvar.

[0043] (Fourth coil set 37d) One terminal of the U-phase coil of the fourth coil set 37d, one terminal of the V-phase coil of the fourth coil set 37d, and one terminal of the W-phase coil of the fourth coil set 37d are short-circuited. The other terminal of the U-phase coil of the fourth coil set 37d is connected to the U-phase wire UL via the fourteenth switch 33d and the twenty-fourth switch 35d. The other terminal of the V-phase coil of the fourth coil set 37d is connected to the V-phase wire VL via the fourteenth switch 33d and the twenty-fourth switch 35d. The other terminal of the W-phase coil of the fourth coil set 37d is connected to the W-phase wire WL via the fourteenth switch 33d and the twenty-fourth switch 35d. The fourth coil set 37d has, for example, a rated voltage of 6600 V and a reactive power of 500 kvar.

[0044] (Fifth coil set 37e) One terminal of the U-phase coil of the fifth coil set 37e, one terminal of the V-phase coil of the fifth coil set 37e, and one terminal of the W-phase coil of the fifth coil set 37e are short-circuited. The other terminal of the U-phase coil of the fifth coil set 37e is connected to the U-phase wire UL via the fifteenth switch 33e and the twenty-fifth switch 35e. The other terminal of the V-phase coil of the fifth coil set 37e is connected to the V-phase wire VL via the fifteenth switch 33e and the twenty-fifth switch 35e. The other terminal of the W-phase coil of the fifth coil set 37e is connected to the W-phase wire WL via the fifteenth switch 33e and the twenty-fifth switch 35e. The fifth coil set 37e has, for example, a rated voltage of 6600 V and a reactive power of 150 kvar.

[0045] (Sixth coil set 37f) One terminal of the U-phase coil of the sixth coil set 37f, one terminal of the V-phase coil of the sixth coil set 37f, and one terminal of the W-phase coil of the sixth coil set 37f are short-circuited. The other terminal of the U-phase coil of the sixth coil set 37f is connected to the U-phase wire UL via the sixteenth switch 33f and the twenty-sixth switch 35f. The other terminal of the V-phase coil of the sixth coil set 37f is connected to the V-phase wire VL via the sixteenth switch 33f and the twenty-sixth switch 35f. The other terminal of the W-phase coil of the sixth coil set 37f is connected to the W-phase wire WL via the sixteenth switch 33f and the twenty-sixth switch 35f. The sixth coil set 37f has, for example, a rated voltage of 6600 V and a reactive power of 200 kvar.

[0046] (First Coil Cooling Units 38a to 38f) The first coil cooling unit 38a is provided below or to the side of the first coil set 37a and includes a cooling device such as a fan for cooling the first coil set 37a. The second coil cooling unit 38b is provided below or to the side of the second coil set 37b and includes a cooling device such as a fan for cooling the second coil set 37b. The third coil cooling unit 38c is provided below or to the side of the third coil set 37c and includes a cooling device such as a fan for cooling the third coil set 37c. The fourth coil cooling unit 38d is provided below or to the side of the fourth coil set 37d and includes a cooling device such as a fan for cooling the fourth coil set 37d. The fifth coil cooling unit 38e is provided below or to the side of the fifth coil set 37e and includes a cooling device such as a fan for cooling the fifth coil set 37e. The sixth coil cooling unit 38f is provided below or to the side of the sixth coil set 37f and includes a cooling device such as a fan for cooling the sixth coil set 37f. The first coil cooling unit 38a to the sixth coil cooling unit 38f are driven by power supplied from the power storage unit 59.

[0047] (First coil holding member 39a to sixth coil holding member 39f) The U-phase coils, V-phase coils, and W-phase coils of the first coil set 37a are held by the first coil holding member 39a. The U-phase coils, V-phase coils, and W-phase coils of the second coil set 37b are held by the second coil holding member 39b. The U-phase coils, V-phase coils, and W-phase coils of the third coil set 37c are held by the third coil holding member 39c. The U-phase coils, V-phase coils, and W-phase coils of the fourth coil set 37d are held by the fourth coil holding member 39d. The U-phase coils, V-phase coils, and W-phase coils of the fifth coil set 37e are held by the fifth coil holding member 39e. The U-phase coils, V-phase coils, and W-phase coils of the sixth coil set 37f are held by the sixth coil holding member 39f.

[0048] Each of the first coil holding member 39a to the sixth coil holding member 39c includes an iron core d1, a lower connecting portion d2, an upper connecting portion d3, and an insulator d4 (see FIG. 5). The three iron cores d1 extend in the z direction and pass inside the coils that make up the coil set. Of the three iron cores d1, the first iron core passes inside the first coil (e.g., the U-phase coil). Of the three iron cores d1, the second iron core passes inside the second coil (e.g., the V-phase coil). Of the three iron cores d1, the third iron core passes inside the third coil (e.g., the W-phase coil). The lower portions of the three iron cores d1 are connected via a lower connecting portion d2 that extends in the y direction. Therefore, the U-phase coil, the V-phase coil, and the W-phase coil are held by the three iron cores d1 and the lower connecting portion d2. The tops of the three iron cores d1 are connected via upper connecting portions d3 extending in the y direction. At least one of the lower connecting portions d2 and d3 is integrally configured with the three iron cores d1. The lower connecting portions d2 are attached to a holding surface via insulators d4. The holding surface is the lower surface of the first housing 41 or the upper surface of the coil cooling portion (e.g., the first coil cooling portion 38a).

[0049] (First housing 41) The first housing 41 houses the operation unit 7, the first circuit breaker 31, the eleventh switch 33a to the sixteenth switch 33f, the twenty-first switch 35a to the twenty-sixth switch 35f, the first fine adjustment switch 36, the first coil set 37a to the sixth coil set 37f, the first coil cooling unit 38a to the sixth coil cooling unit 38f, and the first coil holding member 39a to the sixth coil holding member 39f (see FIGS. 1 and 3 to 5).

[0050] The first housing 41 includes a front surface 41a, a right side surface 41b, a left side surface 41c, a rear surface 41d, and an inner wall 41e. The front surface 41a, the rear surface 41d, and the inner wall 41e have surfaces perpendicular to the y direction. The inner wall 41e is disposed between the front surface 41a and the rear surface 41d. The right side surface 41b and the left side surface 41c have surfaces perpendicular to the x direction. A right side surface opening 41b1 for ventilation (mainly for intake) is provided at the bottom of the right side surface 41b. A left side surface opening 41c1 for ventilation (mainly for intake) is provided at the bottom of the left side surface 41c. A gap corresponding to the right side surface opening 41b1 may be provided between the right side surface 41b and the bottom surface of the first housing 41. A gap corresponding to the left side surface opening 41c1 may be provided between the left side surface 41c and the bottom surface of the first housing 41.

[0051] The operation unit 7, the first circuit breaker 31, and the first fine adjustment switch 36 are disposed in a region (first region 42a) surrounded by the front surface 41a, the right surface 41b, the left surface 41c, and the inner wall 41e. The first coil set 37a, the third coil set 37c, and the fifth coil set 37e are disposed in a region (second region 42b) surrounded by the right surface 41b, the right side of the rear surface 41d in the x direction, and the right side of the inner wall 41e in the x direction. The second coil set 37b, the fourth coil set 37d, and the sixth coil set 37f are disposed in a region (third region 42c) surrounded by the left surface 41c, the left side of the rear surface 41d in the x direction, and the left side of the inner wall 41e in the x direction. A passage having a width of 600 mm or more is formed in a region (fourth region 42d) between the second region 42b and the third region 42c.

[0052] The eleventh switch 33a, the thirteenth switch 33c, and the fifteenth switch 33e are arranged on the second region 42b side of the fourth region 42d. The twenty-first switch 35a, the twenty-third switch 35c, and the thirty-fifth switch 35e are arranged on the fourth region 42d side of the second region 42b.

[0053] The twelfth switch 33b, the fourteenth switch 33d, and the sixteenth switch 33f are arranged on the third region 42c side of the fourth region 42d. The twenty-second switch 35b, the twenty-fourth switch 35d, and the twenty-sixth switch 35f are arranged on the fourth region 42d side of the third region 42c.

[0054] Above the fourth region 42d, the first electric wires 5a (U-phase wire UL, V-phase wire VL, W-phase wire WL), the second electric wires 5b, and the control signal wires 5c are arranged.

[0055] The front surface 41a is provided with a front door 41a1 for entering the first area 42a. The rear surface 41d is provided with a first rear door 41d1 for entering the fourth area 42d in the y direction (see FIG. 3). The upper part of the rear surface 41d is provided with a second rear door 41d2 for ventilation (mainly for exhaust) in an area facing the second area 42b in the y direction and an area facing the third area 42c in the y direction (see FIG. 4).

[0056] (Material of First Housing 41) A portion of the first housing 41, specifically, the area covering the sides of the first to sixth coil sets 37a to 37f in the first housing 41, is made of a plate or mesh of a ferromagnetic material such as iron in order to suppress the generation of eddy currents caused by each coil set. In the first embodiment, at least one of the front surface 41a and the inner wall 41e, the right side surface 41b, the left side surface 41c, and the back surface 41d are made of a plate or mesh of a ferromagnetic material.

[0057] (First power generation unit 43) The first power generation unit 43 is a power generation device that converts light such as sunlight into electricity. The first power generation unit 43 is provided on the upper surface of the first housing 41. The first power generation unit 43 supplies the generated electric power to the power storage unit 59.

[0058] (Transformer 51) The transformer 51 steps down the voltage of the power supplied from the test target power supply 100. For example, the transformer 51 steps down 6600V to 450V.

[0059] (Fine Adjustment Reactor Unit 57) The fine adjustment reactor unit 57 has a fine adjustment coil set 57a, a fine adjustment coil cooler 57b, and a fine adjustment coil holder 57c. The fine adjustment reactor unit 57 is provided outside the first housing 41 in the first load test area 1a. (Fine Adjustment Coil Set 57a) The fine adjustment coil set 57a is used for fine adjustment of the power factor, and a low voltage is applied to it. The fine adjustment coil set 57a includes a U-phase coil, a V-phase coil, and a W-phase coil.

[0060] The central axes of the windings of the U-phase coil, V-phase coil, and W-phase coil of fine adjustment coil set 57a extend in the z-direction. The U-phase coil, V-phase coil, and W-phase coil of fine adjustment coil set 57a are aligned in the y-direction.

[0061] One terminal of the U-phase coil of the fine adjustment coil set 57a, one terminal of the V-phase coil of the fine adjustment coil set 57a, and one terminal of the W-phase coil of the fine adjustment coil set 57a are short-circuited. The other terminal of the U-phase coil of the fine adjustment coil set 57a is connected to the U-phase wire UL via the transformer 51 and the first fine adjustment switch 36. The other terminal of the V-phase coil of the fine adjustment coil set 57a is connected to the V-phase wire VL via the transformer 51 and the first fine adjustment switch 36. The other terminal of the W-phase coil of the fine adjustment coil set 57a is connected to the W-phase wire WL via the transformer 51 and the first fine adjustment switch 36. The fine adjustment coil set 57a has, for example, a rated voltage of 450 V and a reactive power of 150 kvar. The fine adjustment coil set 57a is covered with a ferromagnetic plate or net to suppress the generation of eddy currents due to the fine adjustment coil set.

[0062] (Fine-tuning coil cooling unit 57b) The fine-tuning coil cooling unit 57b is provided below or to the side of the fine-tuning coil set 57a, and includes a cooling device such as a fan for cooling the fine-tuning coil set 57a. The fine-tuning coil cooling unit 57b is driven by power supplied from the power storage unit 59.

[0063] (Fine adjustment coil holding member 57c) The U-phase coil, V-phase coil, and W-phase coil of fine adjustment coil set 57a are held by fine adjustment coil holding member 57c. The configuration of fine adjustment coil holding member 57c is the same as that of the first coil holding member 39a to the sixth coil holding member 39f.

[0064] (Power storage unit 59) The power storage unit 59 stores the power obtained by the first power generation unit 43 and the second power generation unit 73. In particular, it is desirable for the power storage unit 59 to store the power obtained by the first power generation unit 43 and the second power generation unit 73 when power is not supplied from the test target power supply 100 to the main resistor unit 60 and the main reactor unit 30. The power storage unit 59 may store power from an external power supply device, the test target power supply 100, etc. The power storage unit 59 is used as a power source for driving the load testing device 1. Specifically, when power is supplied from the test target power supply 100 to at least one of the main resistor section 60 and the main reactor section 30, that is, when a load test of the test target power supply 100 is performed, the storage section 59 supplies power to the first circuit breaker 31, the eleventh switch 33a to the sixteenth switch 33f, the twenty-first switch 35a to the twenty-sixth switch 35f, the first fine adjustment switch 36, the first coil cooling section 38a to the sixth coil cooling section 38f, the fine adjustment coil cooling section 57b, the second circuit breaker 61, the relays of the first resistor group 63a to the third resistor group 63c, the first resistor group cooling section 64a to the third resistor group cooling section 64c, the relays of the fine adjustment resistor group 67a, and the fine adjustment resistor group cooling section 67b.

[0065] For example, a first switch 59a is provided between the power storage unit 59 and the first power generation unit 43 and between the power storage unit 59 and the second power generation unit 73, and a second switch 59b is provided between the power storage unit 59 and the electrical equipment (such as the first coil cooling unit 38a) that constitutes the load testing apparatus 1. When the second switch 59b is turned on to supply power from the power storage unit 59 to the electrical equipment (such as the first coil cooling unit 38a) that constitutes the load testing apparatus 1, the first switch 59a is turned off to cut off the power supply from the first power generation unit 43 and the second power generation unit 73 to the power storage unit 59. However, even when the second switch 59b is turned on to supply power from the power storage unit 59 to the electrical equipment (such as the first coil cooling unit 38a) that constitutes the load testing apparatus 1, the first switch 59a may not be turned off, and power may be supplied from the first power generation unit 43 and the second power generation unit 73 to the power storage unit 59.

[0066] (Main Resistor Unit 60) The main resistor unit 60 has a second circuit breaker 61, a first resistor group 63a to a third resistor group 63c, a cooling unit for the first resistor group 64a to a third resistor group 64c, and a second fine adjustment switch 66.

[0067] The second circuit breaker 61 is a vacuum circuit breaker (VCB). By switching the second circuit breaker 61 to an interrupted state, the power supply from the test target power supply 100 to the first resistor group 63a to the third resistor group 63c and the fine adjustment resistor group 67a is stopped. The second circuit breaker 61 is driven by power supplied from the power storage unit 59.

[0068] The first resistor group 63a includes a plurality of resistors and is used to perform a load test on one of the three phases (the R phase in the first embodiment) of the power supply under test (three-phase AC power supply) 100. The second resistor group 63b includes a plurality of resistors and is used to perform a load test on one of the three phases (the S phase in the first embodiment) of the power supply under test (three-phase AC power supply) 100. The third resistor group 63c includes a plurality of resistors and is used to perform a load test on one of the three phases (the T phase in the first embodiment) of the power supply under test (three-phase AC power supply) 100.

[0069] Power from the test target power supply 100 is supplied to the first to third resistor groups 63a to 63c via the second circuit breaker 61. On / off control of a relay (not shown) is performed in accordance with the load amount set by the operation unit 7, and the number of resistors in each of the first to third resistor groups 63a to 63c that receive power supply from the test target power supply 100 is adjusted. The relay is driven by power supplied from the power storage unit 59.

[0070] The first resistor group cooling section 64a includes a cooling device such as a fan for cooling the first resistor group 63a. The second resistor group cooling section 64b includes a cooling device such as a fan for cooling the second resistor group 63b. The third resistor group cooling section 64c includes a cooling device such as a fan for cooling the third resistor group 63c. The first resistor group cooling section 64a to the third resistor group cooling section 64c are driven by power supplied from the power storage section 59.

[0071] The second fine adjustment switch 66 is configured by a high-voltage vacuum contactor (VCS: Vacuum Circuit Switch). By controlling the on / off of the second fine adjustment switch 66, on / off control of the power supply from the test target power supply 100 to the fine adjustment resistor group 67a is performed. The second fine adjustment switch 66 is driven by power supplied from the power storage unit 59.

[0072] (Fine-adjustment resistor section 67) The fine-adjustment resistor section 67 has a fine-adjustment resistor group 67a and a fine-adjustment resistor group cooling section 67b. The fine-adjustment resistor section 67 is provided outside the first housing 41 in the first load test area 1a. The fine-adjustment resistor group 67a is used to finely adjust the load amount. The fine-adjustment resistor group cooling section 67b includes a cooling device such as a fan for cooling the fine-adjustment resistor group 67a. The fine-adjustment resistor group cooling section 67b is driven by power supplied from the power storage section 59.

[0073] (Second Housing 71) The second housing 71 accommodates the second circuit breaker 61, the first resistor group 63a to the third resistor group 63c, the cooling section for the first resistor group 64a to the third resistor group 64c, and the second fine adjustment switch 66.

[0074] (Second power generation unit 73) The second power generation unit 73 is a power generation device that converts light such as sunlight into electricity. The second power generation unit 73 is provided on the upper surface of the second housing 71. The second power generation unit 73 supplies the generated electric power to the power storage unit 59.

[0075] (Effect of covering the coil sets with a ferromagnetic plate or net) By utilizing at least the side surface portion of the first housing 41, it is possible to suppress the adverse effects of eddy currents and the like that are generated in the metal surrounding each coil set, such as the first coil set 37a. In addition, by utilizing at least the side surface portion of the first housing 41, it is possible to suppress eddy current loss in each coil set, such as the first coil set 37a. As a result, the power factor can be efficiently adjusted during a load test of the power supply under test 100.

[0076] (Effect of arranging the U-phase coil, V-phase coil, and W-phase coil in the y direction) Compared to a configuration in which the U-phase coil, V-phase coil, and W-phase coil are arranged in the x-direction, it becomes possible to form a passageway for users to pass through in the region (fourth region 42d) between the second region 42b including the first coil set 37a and the third coil set 37c, and the third region 42c including the second coil set 37b and the fourth coil set 37d, in a state that can be mounted on a first mobile device such as a trailer.

[0077] (Effect of arranging the 11th circuit breaker 35a etc. in the second region 42b, the 12th circuit breaker 35b etc. in the third region 42c, and the 21st circuit breaker 33a etc. in the fourth region 42d) The first electric wire 5a from the first circuit breaker 31 can be arranged above the fourth region 42d, making it easier to wire to each coil set.

[0078] (Effect of Providing the Power Storage Unit 59) Even when there is no external power supply, it is possible to drive the electrical equipment (such as the first coil cooling unit 38a) that constitutes the load testing apparatus 1. When a load test is not being performed, that is, when there is no need to supply power from the power storage unit 59 to the electrical equipment (such as the first coil cooling unit 38a) that constitutes the load testing apparatus 1, power is stored. Therefore, it is possible to continue storing the power required for performing a load test without increasing the load on the power storage unit 59.

[0079] (Application Example of Coil Cooling, Second Embodiment) In the first embodiment, an example was described in which coil cooling units (first coil cooling unit 38a to sixth coil cooling unit 38f) were provided below or on the sides of each of the coil sets (first coil set 37a to sixth coil set 37f) and cooling air was supplied to each of them. However, a right coil cooling unit 38g and a left coil cooling unit 38h may be provided in the first region 42a, and cooling air may be supplied to each of the coil sets (first coil set 37a to sixth coil set 37f) via ducts (right guide path 38i and left guide path 38j) (second embodiment, see FIGS. 7 to 10 ).

[0080] (Main reactor unit 30) The main reactor unit 30 of the second embodiment has a first circuit breaker 31, an eleventh switch 33a to a sixteenth switch 33f, a twenty-first switch 35a to a twenty-sixth switch 35f, a first fine adjustment switch 36, a first coil set 37a to a sixth coil set 37f, coil cooling units (right coil cooling unit 38g, left coil cooling unit 38h), and induction paths (right induction path 38i, left induction path 38j).

[0081] (Components not shown) In order to clearly illustrate the right coil cooling section 38g, the left coil cooling section 38h, the right guide path 38i, and the left guide path 38j, Figure 8 omits the illustration of the first circuit breaker 31, the eleventh switch 33a to the sixteenth switch 33f, the twenty-first switch 35a to the twenty-sixth switch 35f, and the first fine adjustment switch 36, and Figure 9 omits the illustration of the second coil set 37b, the fourth coil set 37d, the sixth coil set 37f, the wall separating the second region 42b and the fourth region 42d, and the like.

[0082] The coil cooling units (right coil cooling unit 38g, left coil cooling unit 38h) of the second embodiment are provided in the second region 42a and emit cooling air toward the rear in the y direction. The right coil cooling unit 38g is disposed in front of the fourth region 42d in the y direction and to the right in the x direction. The left coil cooling unit 38h is disposed in front of the fourth region 42d in the y direction and to the left in the x direction.

[0083] The right guide path 38i is a cylindrical body extending in the y direction and made of a non-conductive material (e.g., polyvinyl chloride). The intake end of the right guide path 38i penetrates the inner wall 41e. The intake end of the right guide path 38i is connected to the exhaust port of the right coil cooling unit 38g.

[0084] The intake end of the right-side guideway 38i (solid circle in Figure 10) faces a position slightly shifted upward in the z direction from the center of the fan of the right-side coil cooling section 38g (dotted circle in Figure 10), but it may also face the center in the y direction.

[0085] Ducts (first right duct 38i1 to third right duct 38i3) are provided in the right guideway 38i. The first right duct 38i1 to third right duct 38i3 are configured as T-shaped ducts including one intake end and two exhaust ends. The intake end of the first right duct 38i1 communicates with the exhaust port of the right coil cooling section 38g via the right guideway 38i. One of the exhaust ends of the first right duct 38i1 penetrates the wall separating the second region 42b and the fourth region 42d and communicates with the region in the second region 42b where the first coil set 37a is located. The other of the exhaust ends of the first right duct 38i1 communicates with the intake end of the second right duct 38i2 via the right guideway 38i. One of the exhaust ends of the second right duct 38i2 passes through the wall separating the second region 42b and the fourth region 42d and communicates with the region of the second region 42b where the third coil set 37c is located. The other of the exhaust ends of the second right duct 38i2 communicates with the intake end of the third right duct 38i3 via the right guide path 38i.

[0086] One of the exhaust ends of the third right duct 38i3 penetrates the wall separating the second region 42b and the fourth region 42d and communicates with the region of the second region 42b where the fifth coil set 37e is located. The other of the exhaust ends of the third right duct 38i3 is closed. Therefore, the third right duct 38i3 may be configured as an L-shaped duct including one intake end and one exhaust end.

[0087] The cooling air discharged from the right-side coil cooling section 38g is supplied to the area where the first coil set 37a is located via the right-side induction path 38i and one of the exhaust ends of the first right-side duct 38i1. It is supplied to the area where the third coil set 37c is located via the right-side induction path 38i, the other of the exhaust ends of the first right-side duct 38i1, and one of the exhaust ends of the second right-side duct 38i2. It is supplied to the area where the fifth coil set 37e is located via the right-side induction path 38i, the other of the exhaust ends of the first right-side duct 38i1, the other of the exhaust ends of the second right-side duct 38i2, and one of the exhaust ends of the third right-side duct 38i3. The left-side induction path 38j is a cylindrical body extending in the y direction and made of a non-conductive material (e.g., polyvinyl chloride). The intake end of the left-side induction path 38j penetrates the inner wall 41e. The intake end of the left guide path 38j communicates with the outlet of the left coil cooling section 38h.

[0088] The intake end of the left guide path 38j (solid circle in Figure 10) faces a position slightly shifted upward in the z direction from the center of the fan of the left coil cooling section 38h (dotted circle in Figure 10), but it may also face the center in the y direction.

[0089] Ducts (first left duct 38j1 to third left duct 38j3) are provided in the left guide path 38j. The first left duct 38j1 to third left duct 38j3 are configured as T-shaped ducts including one intake end and two exhaust ends. The intake end of the first left duct 38j1 communicates with the exhaust port of the left coil cooling section 38h via the left guide path 38j. One of the exhaust ends of the first left duct 38j1 penetrates the wall separating the third region 42c and the fourth region 42d and communicates with the region in the third region 42c where the second coil set 37b is located. The other of the exhaust ends of the first left duct 38j1 communicates with the intake end of the second left duct 38j2 via the left guide path 38j.

[0090] One of the exhaust ends of the second left duct 38j2 passes through the wall separating the third region 42c and the fourth region 42d and communicates with the region of the third region 42c where the fourth coil set 37d is located. The other of the exhaust ends of the second left duct 38j2 communicates with the intake end of the third left duct 38j3 via the left guide path 38j.

[0091] One of the exhaust ends of the third left duct 38j3 penetrates the wall separating the third region 42c and the fourth region 42d and communicates with the region of the third region 42c where the sixth coil set 37f is located. The other of the exhaust ends of the third left duct 38j3 is closed. Therefore, the third left duct 38j3 may be configured as an L-shaped duct with one intake end and one exhaust end.

[0092] The cooling air discharged from the left coil cooling section 38h is supplied to the area where the second coil set 37b is located via the left guideway 38j and one of the exhaust ends of the first left duct 38j1, supplied to the area where the fourth coil set 37d is located via the left guideway 38j, the other of the exhaust ends of the first left duct 38j1 and one of the exhaust ends of the second left duct 38j2, and supplied to the area where the sixth coil set 37f is located via the left guideway 38j, the other of the exhaust ends of the first left duct 38j1, the other of the exhaust ends of the second left duct 38j2 and one of the exhaust ends of the third left duct 38j3.

[0093] The front surface 41a is provided with a front door 41a1 for entering the first region 42a and for ventilation (mainly for intake). The front door 41a1 may be formed symmetrically as shown in FIG. 3 or asymmetrically as shown in FIG. 8. In the second embodiment, the right side surface 41b does not have a right side opening 41b1. In the second embodiment, the left side surface 41c does not have a left side opening 41c1. In the rear surface 41d, a first rear door 41d1 for entering the fourth region 42d is provided in a region facing the fourth region 42d in the y direction (see FIG. 8). In the upper part of the rear surface 41d, a second rear door 41d2 for ventilation (mainly for exhaust) is provided in a region facing the second region 42b in the y direction and a region facing the third region 42c in the y direction (see FIG. 9). The second rear door 41d2 includes a ventilation fan for discharging air from the second area 42b or the third area 42c to the outside.

[0094] (Cooling Air Flow) The right coil cooling unit 38g takes in air from the right side opening 41b1 of the first region 42a and supplies it to the second region 42b via the right guide path 38i and other means. The air supplied to the second region 42b cools and heats the first coil set 37a, the third coil set 37c, and the fifth coil set 37e. A ventilation fan of a second rear door 41d2, located in an area at the top of the rear surface 41d opposite the second region 42b in the y direction, exhausts the heated air in the second region 42b to the outside.

[0095] The left coil cooling section 38h takes in air from the left side opening 41c1 of the first section 42a and supplies it to the third section 42c via the left guide path 38j. The air supplied to the third section 42c cools and heats the second coil set 37b, the fourth coil set 37d, and the sixth coil set 37f. A ventilation fan of the second rear door 41d2, located in an area facing the third section 42c in the y direction at the top of the rear surface 41d, exhausts the heated air in the third section 42c to the outside.

[0096] (Effect of supplying cooling air from an area separated by a wall) The holes (right side opening 41b1, left side opening 41c1) for taking in air from the outside can be omitted in the side walls of the areas where the coil sets are located (second area 42b, third area 42c), making it possible to suppress adverse effects such as eddy currents that may be generated in the metal surrounding the coil sets through these holes. By making the induction paths (right induction path 38i, left induction path 38j) out of a non-conductive material, it is possible to suppress adverse effects such as eddy currents that may be generated in the induction paths compared to an embodiment in which the induction paths are made of a conductive material.

[0097] (Application Example of Fine Adjustment Resistor Unit 67) In the first and second embodiments, an example has been described in which the fine adjustment resistor unit 67 is connected to the test target power supply 100 via the second circuit breaker 61. However, the fine adjustment resistor unit 67 may also be connected to the test target power supply 100 via the first circuit breaker 31. In this case, the second fine adjustment switch 66 is provided in the first load test area 1a.

[0098] (Application Example of First Housing 41) In the first and second embodiments, examples have been described in which the members covering the sides of the coil set (front surface 41a, right side surface 41b, left side surface 41c, back surface 41d, and inner wall 41e) in the first housing 41 are made of a ferromagnetic plate or mesh. However, the members covering the top of the coil set (top surface of the first housing 41) and the members covering the bottom of the coil set (bottom surface of the first housing 41) may also be made of a ferromagnetic plate or mesh.

[0099] (Application Example of the Number of Coil Sets) In the first and second embodiments, an example has been described in which the main reactor unit 30 has six coil sets (first coil set 37a to sixth coil set 37f). However, the number of coil sets included in the main reactor unit 30 is not limited to six.

[0100] Although several 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 within the scope and spirit of the invention, as well as within the scope of the invention described in the claims and their equivalents.

[0101] 1 Load test device 1a First load test area 1b Second load test area 5a First electric line 5b Second electric line 5c Control signal line 7 Operation unit 30 Main reactor unit 31 First circuit breaker (VCB) 33a to 33f Eleventh switch to sixteenth switch (LBS) 35a to 35f Twenty-first switch to twenty-sixth switch (VCS) 36 First fine adjustment switch (VCS) 37a to 37f First coil set to sixth coil set 38a to 38f First coil cooling unit to sixth coil cooling unit 38g Right coil cooling unit 38h Left coil cooling unit 38i Right guideway 38i1 First right duct 38i2 Second right duct 38i3 Third right duct 38j Left guideway 38j1 First left duct 38j2 Second left duct 38j3 Third left duct 39a to 39f First coil holding member to sixth coil holding member 41 First housing 41a Front surface 41a1 Front door 41b Right side surface 41b1 Right side opening 41c Left side surface 41c1 Left side opening 41d Rear surface 41d1 First rear door 41d2 Second rear door 41e Inner wall 42a to 42d First area to fourth area 43 First power generating unit 51 Transformer 57 Fine adjustment reactor unit 57a Fine adjustment coil set 57b Fine adjustment coil cooling unit 57c Fine adjustment coil holding member 59 Power storage unit 59a First switch 59b Second switch 60 Main resistance unit 61 Second circuit breaker (VCB) 63a to 63c First resistor group to third resistor group 64a to 64c Cooling section for first resistor group to cooling section for third resistor group 66 Second fine adjustment switch (VCS) 67 Fine adjustment resistor section 67a Fine adjustment resistor group 67b Cooling section for fine adjustment resistor group 71 Second housing 73 Second power generating section d1 Iron core d2 Lower connecting section d3 Upper connecting section d4 Insulator UL U phase wire VL U phase wire WL W phase wire

Claims

1. A main reactor section having two or more coil sets, each containing one or more coils, which receive power from a power source under test via a switch, A main resistor section having one or more resistor groups including one or more resistors, which receive power from the power supply under test, The device comprises the aforementioned switch and a first housing that accommodates the two or more coil sets, The coils included in each of the two or more coil sets are positioned so that the central axes of the windings do not overlap. A load testing device wherein at least a portion of the first housing is made of a ferromagnetic plate or mesh in order to suppress the generation of eddy currents caused by the two or more coil sets.

2. The first housing can be mounted on a mobile device, The first housing, when viewed from above, has its longitudinal direction as the front-to-back direction of the moving device, and its short direction as the left-to-right direction of the moving device. Each of the two or more coil sets includes, as one or more coils, a U-phase coil, a V-phase coil, and a W-phase coil, the windings having their central axes extending in the vertical direction. The reactor section has two or more coil sets, namely a first coil set, a second coil set, a third coil set, and a fourth coil set. The first coil set is located on the front and right side of the first housing, The second coil set is located on the front and left side of the first housing, The third coil set is located on the rear and right side of the first housing, The fourth coil set is located on the rear and left side of the first housing, The load testing apparatus according to claim 1, wherein the U-phase coil, V-phase coil, and W-phase coil of the first coil set, the second coil set, the third coil set, and the fourth coil set are arranged in the front-to-back direction.

3. A gap of 600 mm or more is provided between the first coil set and the second coil set. A gap of 600 mm or more is provided between the third coil set and the fourth coil set. A rear door for ventilation is provided on the back of the aforementioned enclosure. The main reactor section has a coil cooling section and a guide path composed of a non-conductive member that guides the cooling air emitted from the coil cooling section in a certain direction to the back surface to a certain region of the two or more coil sets. The induction path passes between the first coil set and the second coil set, and between the third coil set and the fourth coil set. Between the region containing the coil cooling section and the region containing the two or more coil sets, at least one wall is provided separating the region containing the coil cooling section and the region containing the two or more coil sets, and the guide path penetrates the wall. The load testing apparatus according to claim 2, wherein at least one of the surface of the first housing opposite to the rear surface and the wall is made of a ferromagnetic plate or mesh in order to suppress the generation of eddy currents caused by the two or more coil sets.

4. A front door is provided on the front of the aforementioned housing. In the area in front of the first coil set and the second coil set, including the front door, an operating section and a first circuit breaker are provided. Power is supplied from the power supply under test to the two or more coil sets via the first circuit breaker. The load testing apparatus according to claim 2 or 3, wherein the selection of the coil set to be supplied from the power supply under test, among the two or more coil sets, is performed via the operating unit.

5. A fine-tuning coil set containing one or more coils, used for fine-tuning the power factor, The system further comprises a transformer that steps down the voltage of the power supplied from the power supply under test, The fine adjustment coil set, the transformer, the fine adjustment resistor section, and the first fine adjustment switch are arranged on the outside of the first housing. The fine adjustment coil set is covered with a ferromagnetic plate or mesh in order to suppress the generation of eddy currents caused by the fine adjustment coil set. The load test apparatus according to claim 4, wherein power is supplied from the power supply under test to the fine adjustment coil set via the first circuit breaker, the transformer, and the first fine adjustment switch.

6. The second circuit breaker, The main resistor and the second circuit breaker are housed in a second housing, A fine-tuning resistor section having one or more resistor groups, each containing one or more resistors, used for fine-tuning the load amount, It further includes a second fine adjustment switch, The first circuit breaker and the second circuit breaker are composed of vacuum circuit breakers. The first fine adjustment switch and the second fine adjustment switch are composed of high-voltage vacuum contactors. The fine adjustment resistor section is located outside the first housing and outside the second housing. The power supply from the power supply under test to the resistor of the main resistor is provided at least via the second circuit breaker. The load test apparatus according to claim 5, wherein power is supplied from the power supply under test to the resistor of the fine adjustment resistor section via at least one of the first circuit breaker and the second circuit breaker and the second fine adjustment switch.

7. Viewed from above, the 11th switch, the 12th switch, the 21st switch, and the 22nd switch are provided between the first coil set and the second coil set. The first circuit breaker is composed of a vacuum circuit breaker. The 11th switch and the 12th switch are composed of high-voltage AC load switches. The 21st switch and the 22nd switch are composed of high-voltage vacuum contactors. The 11th switch is connected to the 1st circuit breaker and the 21st switch, The 12th switch is connected to the 1st circuit breaker and the 22nd switch, The power supply from the power source under test to the first coil set is provided via the first circuit breaker, the 11th switch, and the 21st switch. The power supply from the power source under test to the second coil set is provided via the first circuit breaker, the twelfth switch, and the twelfth switch. Viewed from above, the 21st switch is positioned closer to the first coil set than the 11th switch. The load testing apparatus according to claim 4, wherein, when viewed from above, the 22nd switch is positioned closer to the second coil set than the 12th switch.

8. The power generation section, The system further includes a power storage unit that stores power obtained in the power generation unit when power is not supplied from the power supply under test to the main resistor unit and the main reactor unit, The power generation unit is provided at least on the upper surface of the first housing, The energy storage unit is provided on the outside of the first housing, The aforementioned energy storage unit is used as a power source for driving the load testing device. The load test apparatus according to claim 1, wherein when power is supplied from the power supply under test to at least one of the main resistor section and the main reactor section, power from the energy storage section is supplied to at least the coil cooling section for cooling the two or more coil sets of the main reactor section and the resistor group cooling section for cooling the one or more resistor groups of the main resistor section, and the power supply from the power generation section to the energy storage section is cut off.

9. The main reactor section has a coil cooling section and a guide path composed of a non-conductive member that guides the cooling air emitted from the coil cooling section to an area containing the two or more coil sets. The aforementioned guideway passes between the two or more coil sets, Between the coil cooling section and the area containing the two or more coil sets, at least one wall is provided separating the area containing the coil cooling section from the area containing the two or more coil sets, and the guide path penetrates the wall. The load testing apparatus according to claim 1, wherein the intake end of the induction path faces a position offset from the center of the fan of the coil cooling unit.

10. The load testing apparatus according to claim 1, wherein the region of the first housing that suppresses the generation of eddy currents caused by the two or more coil sets is made of a ferromagnetic mesh.