Load testing device

Abstract

The present invention provides a load testing apparatus that can suppress the intrusion of liquids such as rainwater into the resistance section while enabling the exhaust of air heated in the resistance section during load testing. [Solution] The load testing apparatus comprises a resistance section, a cooling section that supplies cooling air to the resistance section from below, a lateral exhaust duct that guides the air discharged from the resistance section in a lateral direction, and a vertical exhaust hood that guides the air discharged from the lateral exhaust duct in a vertical direction.

Description

Technical Field

[0001] The present invention relates to a load test device and the like.

Background Art

[0002] Conventionally, a load test device has been proposed as in Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the suppression of the intrusion of liquids such as rainwater from above is not sufficient.

[0005] Therefore, an object of the present invention is to provide a load test device that can suppress the intrusion of liquids such as rainwater into the resistance part and realize the exhaust of the air heated by the resistance part in a load test.

Means for Solving the Problems

[0006] The load test device according to the present invention includes an exhaust part having a resistance part, a cooling part that supplies cooling air to the resistance part from below, a lateral exhaust duct that guides the air discharged from the resistance part in a lateral direction, and a vertical exhaust hood that guides the air discharged from the lateral exhaust duct in a vertical direction.

[0007] Compared with the form in which a lid that can be opened and closed is provided at the exhaust port of the resistance part, there is no need to perform operations such as checking the opening and closing of the lid, and while suppressing the intrusion of liquids such as rainwater from above into the resistance part, in a load test, the exhaust of the air heated by the resistance part upward can be realized. Also, the opening and closing mechanism of the lid can be omitted.

[0008] Preferably, the vertical exhaust hood is provided with a recess located lower than the connection point between the vertical exhaust hood and the horizontal exhaust duct, for collecting liquid that has entered from above the vertical exhaust hood.

[0009] By storing water in the recess, it is possible to suppress the ingress of liquids such as rainwater that enter through the opening at the top of the vertical exhaust hood into the upstream area.

[0010] More preferably, a drainage section including a drain port and a drain is provided at the lower end of the recess.

[0011] Preferably, an opening / closing section is provided on at least one of the intake side of the vertical exhaust hood and the exhaust side of the horizontal exhaust duct. The opening / closing section includes an opening / closing door that is biased in a closing direction to block the flow of air and opens by the air discharged from the resistance section. The opening / closing section includes a rotation stopper that prevents the opening / closing door from opening too far and narrowing the opening of an adjacent opening / closing door when the opening / closing door is opened by the air discharged from the resistance section.

[0012] Because it is biased in the closing direction, it can suppress the intrusion of liquids such as rainwater into the upstream area. When cooling air is supplied from the cooling unit, the cooling air keeps the door open, allowing exhaust to be carried out through the horizontal exhaust duct and the vertical exhaust hood.

[0013] More preferably, a water drainage section including a wall is provided on at least one of the intake side of the vertical exhaust hood and the exhaust side of the horizontal exhaust duct, upstream of the opening and closing section.

[0014] Even if liquid overflowing from the recess passes through the opening and closing door of the opening and closing section, the wall of the drain section can block it, preventing it from entering upstream.

[0015] Preferably, guide vanes (wind tunnel guides) are provided inside the lateral exhaust duct to guide the air discharged from the resistance section toward the side where the vertical exhaust hood is located.

[0016] Even when the vertical dimension of the lateral exhaust duct is short, it is possible to guide air from below in a lateral direction without generating turbulence.

[0017] Preferably, the load testing device is used to perform load testing on a power supply under test with a high voltage of 6kV or higher. A wind tunnel duct is provided between the resistance section and the exhaust section to guide the air discharged from the resistance section to the exhaust section. The aforementioned wind tunnel duct is made of insulating material. A gap of 10 mm or more is provided between the case holding the resistance unit and the wind tunnel duct.

[0018] This can reduce the possibility of electrical leakage when performing high-voltage load tests.

[0019] Preferably, a net is provided at the exhaust-side opening of the vertical exhaust hood.

[0020] While maintaining exhaust, it is possible to prevent birds and other animals, as well as garbage, from entering the first exhaust section 50a.

[0021] The load testing apparatus according to the present invention comprises a resistance section, a cooling section that supplies cooling air to the resistance section from the side, and an exhaust section having a vertical exhaust hood that guides the air discharged from the resistance section in the vertical direction, wherein the vertical exhaust hood is provided with a recess at a position lower than the area connected to the resistance section for collecting liquid that has entered from above the vertical exhaust hood.

[0022] Compared to a configuration where an openable / closable lid is provided at the exhaust port of the resistance section, this design eliminates the need to perform checks on whether the lid is open or closed. By accumulating the contents in the recess, it suppresses the intrusion of liquids such as rainwater into the resistance section from above, while enabling upward exhaust of the air heated in the resistance section during load testing. [Effect of the Invention]

[0023] As described above, according to the present invention, it is possible to provide a load test apparatus that can suppress the intrusion of liquids such as rainwater into the resistance part and realize the exhaust of the air heated by the resistance part in the load test. [Brief Description of the Drawings]

[0024] [Figure 1] It is a side view of the load test apparatus in the first embodiment as viewed from the y direction. [Figure 2] It is a side view of the first load test part including the first opening / closing part in the closed state in the first embodiment as viewed from the x direction. [Figure 3] It is an enlarged view of the region including the first exhaust part in FIG. 2. [Figure 4] It is a side view of the first load test part including the first opening / closing part in the open state in the first embodiment as viewed from the x direction. [Figure 5] It is a side view of the first load test part in the second embodiment as viewed from the x direction. [Modes for Carrying Out the Invention]

[0025] Hereinafter, the first embodiment will be described with reference to the drawings. Note that the embodiments are not limited to the following embodiments. In addition, the content described in one embodiment is generally applied to other embodiments as well. In addition, each embodiment and each modification can be combined as appropriate.

[0026] For the purpose of explaining the directions, the horizontal direction in which the first load test part 1a, the second load test part 1b, and the third load test part 1c are arranged is defined as the x direction, the horizontal direction perpendicular to the x direction is defined as the y direction, and the vertical direction perpendicular to the x direction and the y direction is defined as the z direction. In addition, in FIGS. 1 to 4, the directions indicated by the arrows of the xyz axes are defined as the forward direction, the left direction, and the upward direction, respectively. To illustrate the internal structure of the case, Figure 1 omits the front side (left side in the y-direction) of the first case 3a to the third case 3c, and Figures 2 to 4 omit the front side (rear side in the x-direction) of the first case 3a, the first lateral exhaust duct 51a, and the first vertical exhaust hood 52a.

[0027] (Load testing device 1) The load testing apparatus 1 in the first embodiment comprises a first load testing section 1a, a second load testing section 1b, a third load testing section 1c, a base section 2, a first case 3a, a second case 3b, and a third case 3c (see Figures 1 to 4).

[0028] (First load test section 1a to third load test section 1c) The first load test section 1a includes a first resistance section 10a, a first cooling section 30a, and a first exhaust section 50a. The second load test section 1b includes a second resistance section 10b, a second cooling section 30b, and a second exhaust section 50b. The third load test section 1c includes a third resistance section 10c, a third cooling section 30c, and a third exhaust section 50c.

[0029] (Base part 2) The base portion 2 holds the first case 3a at its top via the first base 2a, the second case 3b at its top via the second base 2b, and the third case 3c at its top via the third base 2c.

[0030] (Case 1, 3a to Case 3, 3c) The first case 3a holds the first resistor 10a and the first cooling unit 30a internally, and the first exhaust unit 50a at the top. The second case 3b holds the second resistance section 10b and the second cooling section 30b internally, and holds the second exhaust section 50b at the top. The third case 3c holds the third resistor 10c and the third cooling unit 30c internally, and holds the third exhaust unit 50c at the top.

[0031] (First resistance section 10a to third resistance section 10c) The first resistor 10a is supplied with power from the R-phase terminal of the power supply under test. The second resistor 10b is supplied with power from the S-phase terminal of the power supply under test. The third resistor 10c is supplied with power from the T-phase terminal of the power supply under test. The first resistor section 10a to the third resistor section 10c generate heat when power is supplied from the power supply under test.

[0032] The first cooling section 30a is located upstream of the airflow supplied to cool the first resistance section 10a, and the first exhaust section 50a is located downstream of the airflow. The second cooling section 30b is located upstream of the airflow supplied to cool the second resistance section 10b, and the second exhaust section 50b is located downstream of the airflow. The third cooling section 30c is located upstream of the airflow supplied to cool the third resistance section 10c, and the third exhaust section 50c is located downstream of the airflow.

[0033] Upstream of the first resistance section 10a (on the side of the first cooling section 30a), an eleventh wind tunnel duct 10a1 is provided to guide air from the first cooling section 30a upward in the z direction (towards the first resistance section 10a). The 11th wind tunnel duct 10a1 is preferably made of insulating material. A 12th wind tunnel duct 10a2 is provided downstream of the first resistance section 10a (on the side of the first exhaust section 50a) to guide the air from the first resistance section 10a upward in the z direction (towards the first lateral exhaust duct 51a). The 12th wind tunnel duct 10a2 is preferably made of insulating material.

[0034] A 21st wind tunnel duct 10b1 is provided upstream of the second resistance section 10b (on the second cooling section 30b side) to guide air from the second cooling section 30b upward in the z direction (towards the second resistance section 10b). The 21st wind tunnel duct 10b1 is preferably made of insulating material. A 22nd wind tunnel duct 10b2 is provided downstream of the second resistance section 10b (on the side of the second exhaust section 50b) to guide the air from the second resistance section 10b upward in the z direction (towards the second lateral exhaust duct 51b). The 22nd wind tunnel duct 10b2 is preferably made of insulating material.

[0035] A 31st wind tunnel duct 10c1 is provided upstream of the third resistance section 10c (on the third cooling section 30c side) to guide air from the third cooling section 30c upward in the z direction (towards the third resistance section 10c). The 31st wind tunnel duct 10c1 is preferably made of insulating material. A 32nd wind tunnel duct 10c2 is provided downstream of the 3rd resistance section 10c (on the side of the 3rd exhaust section 50c) to guide the air from the 3rd resistance section 10c upward in the z direction (towards the 3rd lateral exhaust duct 51c). The 32nd wind tunnel duct 10c2 is preferably made of insulating material.

[0036] When the load test device 1 is used for load testing of a test power supply with a high voltage of 6kV or more, it is desirable to provide a clearance d of 10 mm or more between the 12th wind tunnel duct 10a2 and the 1st case 3a, between the 22nd wind tunnel duct 10b2 and the 2nd case 3b, and between the 32nd wind tunnel duct 10c2 and the 3rd case 3c.

[0037] (First cooling section 30a to third cooling section 30c) The first cooling unit 30a is located below the first resistor 10a and supplies cooling air upward in the z direction to cool the first resistor 10a which has generated heat. The cooling air supplied from the first cooling section 30a is heated by passing through the first resistance section 10a and discharged upward in the z direction via the first exhaust section 50a. The second cooling unit 30b is located below the second resistor unit 10b and supplies cooling air upward in the z direction to cool the heated second resistor unit 10b. The cooling air supplied from the second cooling section 30b is heated by passing through the second resistance section 10b and discharged upward in the z direction via the second exhaust section 50b. The third cooling unit 30c is located below the third resistor 10c and supplies cooling air upward in the z direction to cool the heat-generating third resistor 10c. The cooling air supplied from the third cooling section 30c is heated by passing through the third resistance section 10c and discharged upward in the z direction via the third exhaust section 50c.

[0038] (First exhaust section 50a) Next, the configuration of the first exhaust section 50a will be described. The first exhaust section 50a includes a first lateral exhaust duct 51a, a first vertical exhaust hood 52a, a first recess 53a, a first drain section 54a, a first opening / closing section 55a, a first water drain section 56a, a first guide vane 57a, and a first net 58a.

[0039] (First lateral exhaust duct 51a) The first lateral exhaust duct 51a is a cylindrical object with one side (such as an elbow) and a bottom opening, and it discharges air from the lower side in the z direction (air discharged from the first resistance section 10a) in the lateral direction (for example, the y direction). The lower opening of the first lateral exhaust duct 51a faces the exhaust port of the first resistance section 10a in the z-direction. One opening on the side of the first lateral exhaust duct 51a is provided in a region that does not face another member (for example, the second lateral exhaust duct 51b, etc.) (for example, the left side in the y-direction).

[0040] (First longitudinal exhaust hood 52a) The first vertical exhaust hood 52a is a cylindrical object with one side (such as an elbow) and the top surface open, and it discharges air from the side (for example, the y-direction) (air discharged from the first horizontal exhaust duct 51a) upward in the z-direction. One opening on the side of the first vertical exhaust hood 52a faces one opening on the side of the first lateral exhaust duct 51a. The first vertical exhaust hood 52a is provided in an area that does not physically interfere with other components (for example, the second lateral exhaust duct 51b, etc.) (for example, to the left of the first lateral exhaust duct 51a in the y-direction).

[0041] The cooling air from the first cooling section 30a is discharged upward in the z direction via the first resistance section 10a, the first lateral exhaust duct 51a, and the first vertical exhaust hood 52a.

[0042] (First recess 53a) A first recess 53a is formed on the lower surface of the first vertical exhaust hood 52a to collect liquids such as rainwater that have entered from the upper side in the z direction of the first vertical exhaust hood 52a. The first recess 53a is located at a lower position (downward in the z direction) than the connection point between the first vertical exhaust hood 52a and the first horizontal exhaust duct 51a, and the first opening / closing section 55a and the first water drain section 56a, which will be described later.

[0043] (First drainage section 54a) A first drain section 54a, including a drain port and a drain, is provided at the lower end of the first recess 53a. The liquid accumulated in the first recess 53a is discharged to the outside (such as the lower side in the z direction of the first vertical exhaust hood 52a) via the first drainage section 54a.

[0044] (First opening / closing section 55a) A first opening / closing section 55a is provided on at least one of the intake side of the first vertical exhaust hood 52a and the exhaust side of the first horizontal exhaust duct 51a. The first opening / closing section 55a is biased in a closing direction to block the airflow between the first vertical exhaust hood 52a and the first horizontal exhaust duct 51a, and includes an opening / closing door that opens with the air discharged from the first resistance section 10a. The first opening / closing section 55a includes a rotation stopper that, when opened by air discharged from the first resistance section 10a, prevents the opening / closing door from opening too far and narrowing the opening of the adjacent opening / closing door, and maintains the opening of the opening / closing door in its widest state.

[0045] (First drainage section 56a) A first water drain section 56a is provided on at least one of the intake side of the first vertical exhaust hood 52a and the exhaust side of the first horizontal exhaust duct 51a, upstream of the first opening / closing section 55a. The first drain section 56a is perpendicular to the y-direction when viewed from the x-direction and includes a wall that blocks the flow of water from the exhaust side of the first vertical exhaust hood 52a.

[0046] (First guide vane 57a) The first guide vane 57a is provided inside the first lateral exhaust duct 51a. The first guide vane 57a guides the air coming from below in the z direction (air discharged from the first resistance section 10a) in the lateral direction (towards the side where the first vertical exhaust hood 52a is located).

[0047] (Net 1, 58a) The first net 58a is provided at the exhaust-side opening of the first vertical exhaust hood.

[0048] (Effects of providing the first lateral exhaust duct 51a and the first vertical exhaust hood 52a) Compared to a configuration in which an openable and closable lid is provided at the exhaust port of the first resistance section 10a, this configuration eliminates the need to perform checks on the opening and closing of the lid, suppresses the ingress of liquids such as rainwater into the first resistance section 10a from the upper z-direction, and enables exhaust of air heated by the first resistance section 10a to the upper z-direction during load testing. Furthermore, the mechanism for opening and closing the lid can be omitted.

[0049] (Effects of providing the first recess 53a) By storing water in the first recess 53a, it is possible to suppress the intrusion of liquids such as rainwater that have entered through the opening on the upper side in the z direction of the first vertical exhaust hood 52a into the upstream area.

[0050] (Effects of providing the first opening / closing section 55a) Because it is biased in the closing direction, it can suppress the intrusion of liquids such as rainwater into the upstream area. When cooling air is supplied from the first cooling unit 10a, the opening and closing door is opened by the cooling air, allowing exhaust to be performed via the first horizontal exhaust duct 51a and the first vertical exhaust hood 52a.

[0051] (Effects of providing the first drainage section 56a) Even if the liquid overflowing from the first recess 53a passes through the opening / closing door of the first opening / closing section 55a, it can be blocked by the wall of the first drainage section 56a, preventing it from entering upstream.

[0052] (Effects of providing the first guide vane 57a) Even when the z-direction dimension of the first lateral exhaust duct 51a is short, it is possible to guide air from below in the z-direction laterally without generating turbulence.

[0053] (Effects of providing a separation distance d) This can reduce the possibility of electrical leakage when performing high-voltage load tests.

[0054] (Effects of establishing the first net 58a) The first net 58a prevents birds and other animals, as well as garbage, from entering the first exhaust section 50a while maintaining exhaust flow.

[0055] The second exhaust section 50b includes a second lateral exhaust duct 51b, a second vertical exhaust hood 52b, a second recess 53b, a second drain section 54b, a second opening / closing section 55b, a second water drain section 56b, a second guide vane 57b, and a second net 58b. The third exhaust section 50c includes a third lateral exhaust duct 51c, a third vertical exhaust hood 52c, a third recess 53c, a third drain section 54c, a third opening / closing section 55c, a third water drain section 56c, a third guide vane 57c, and a third net 58c.

[0056] The configuration of the second lateral exhaust duct 51b and the third lateral exhaust duct 51c is the same as the configuration of the first lateral exhaust duct 51a. The configuration of the second longitudinal exhaust hood 52b and the third longitudinal exhaust hood 52c is the same as the configuration of the first longitudinal exhaust hood 52a. The configuration of the second recess 53b and the third recess 53c is the same as the configuration of the first recess 53a. The configuration of the second drainage section 54b and the third drainage section 54c is the same as the configuration of the first drainage section 54a. The configuration of the second opening / closing section 55b and the third opening / closing section 55c is the same as the configuration of the first opening / closing section 55a. The configuration of the second drain section 56b and the third drain section 56c is the same as the configuration of the first drain section 56a. The configuration of the second guide vane 57b and the third guide vane 57c is the same as the configuration of the first guide vane 57a. The configuration of the second net 58b and the third net 58c is the same as the configuration of the first net 58a.

[0057] (Examples of applications of load testing device 1) In the first embodiment, an example was described in which the load testing device 1 is equipped with three load testing sections (first load testing section 1a, second load testing section 1b, and third load testing section 1c) for load testing of a three-phase AC generator. However, the load testing section may be provided as a single unit, or as two or four or more units. The second embodiment described later illustrates an example in which the load testing device 1 includes one load testing section (first load testing section 1a).

[0058] (Application example 2 of load testing device 1) In the first embodiment, an example was described in which the first cooling section 30a and the first resistance section 10a are arranged in the z direction, the second cooling section 30b and the second resistance section 10b are arranged in the z direction, and the third cooling section 30c and the third resistance section 10c are arranged in the z direction.

[0059] However, the first cooling section 30a and the first resistive section 10a may be arranged in the lateral direction (for example, the y-direction) (see the second embodiment, Figure 5).

[0060] To explain the directions, we define the horizontal direction in which the first resistance section 10a and the first cooling section 30a are arranged as the y-direction, the horizontal direction perpendicular to the y-direction as the x-direction, and the vertical direction perpendicular to both the x-direction and the y-direction as the z-direction. Furthermore, in Figure 5, the directions indicated by the arrows on the y and z axes are defined as left and upward, respectively. To illustrate the internal structure of the case, Figure 5 omits the front (rear in the x-direction) surfaces of the first case 3a, the first lateral exhaust duct 51a, and the first vertical exhaust hood 52a.

[0061] (Base part 2) The base portion 2 holds the first case 3a at its upper part.

[0062] (Case 1, 3a) In the second embodiment, the first case 3a holds the first resistance section 10a and the first cooling section 30a internally, and holds the first exhaust section 50a on its side.

[0063] (First resistor section 10a) The first resistor 10a is supplied with power from the power supply under test. The first resistor 10a generates heat due to the power supply from the power source under test.

[0064] (First cooling section 30a) In the second embodiment, the first cooling unit 30a is positioned to the side (right side in the y-direction) of the first resistor 10a and supplies cooling air toward the left side in the y-direction to cool the first resistor 10a that has generated heat. The cooling air supplied from the first cooling section 30a is heated by passing through the first resistance section 10a and discharged upward in the z direction via the first exhaust section 50a.

[0065] (First exhaust section 50a) The first exhaust section 50a of the second embodiment includes a first vertical exhaust hood 52a, a first recess 53a, a first drain section 54a, a first opening / closing section 55a, a first water drain section 56a, and a first net 58a.

[0066] (First longitudinal exhaust hood 52a) The first vertical exhaust hood 52a is a cylindrical object with one side (such as an elbow) and the top surface open, and it discharges air from the side (for example, the right side in the y-direction) (air discharged from the first resistance section 10a) upward in the z-direction. One opening on the side of the first vertical exhaust hood 52a faces the exhaust port of the first resistance section 10a.

[0067] The cooling air from the first cooling section 30a is discharged upward in the z direction via the first resistance section 10a and the first vertical exhaust hood 52a.

[0068] (First recess 53a) A first recess 53a is formed on the lower surface of the first vertical exhaust hood 52a to collect liquids such as rainwater that have entered from the upper side in the z direction of the first vertical exhaust hood 52a. The first recess 53a is located at a lower position (downward in the z direction) than the connection point between the first vertical exhaust hood 52a and the first resistance section 10a, and the first opening / closing section 55a and the first water drain section 56a, which will be described later.

[0069] (First drainage section 54a) A first drain section 54a, including a drain port and a drain, is provided at the lower end of the first recess 53a. The liquid accumulated in the first recess 53a is discharged to the outside (such as the lower side in the z direction of the first vertical exhaust hood 52a) via the first drainage section 54a.

[0070] (First opening / closing section 55a) A first opening / closing section 55a is provided on the intake side of the first vertical exhaust hood 52a. The first opening / closing section 55a is biased in a closing direction to block the airflow between the first vertical exhaust hood 52a and the first resistance section 10a, and includes an opening / closing door that opens with the air discharged from the first resistance section 10a. The first opening / closing section 55a includes a rotation stopper that, when opened by air discharged from the first resistance section 10a, prevents the opening / closing door from opening too far and narrowing the opening of the adjacent opening / closing door, and maintains the opening of the opening / closing door in its widest state.

[0071] (First drainage section 56a) A first water drain section 56a is provided on the intake side of the first vertical exhaust hood 52a, upstream of the first opening / closing section 55a. The first drain section 56a is perpendicular to the y-direction when viewed from the x-direction and includes a wall that blocks the flow of water from the exhaust side of the first vertical exhaust hood 52a.

[0072] In the second embodiment, the member corresponding to the first guide vane 57a is omitted, but a member corresponding to the first guide base 57a may be provided inside the first vertical exhaust hood 52a.

[0073] (Net 1, 58a) The first net 58a is provided at the exhaust-side opening of the first vertical exhaust hood.

[0074] (Effects of providing the first vertical exhaust hood 52a and the first recess 53a) Compared to a configuration in which an openable and closable lid is provided at the exhaust port of the first resistance section 10a, this configuration eliminates the need to perform checks on the opening and closing of the lid, and by storing it in the first recess 53a, it is possible to suppress the ingress of liquids such as rainwater into the first resistance section 10a from the upper side in the z direction, while simultaneously enabling the exhaust of air heated by the first resistance section 10a to the upper side in the z direction during load testing. Furthermore, the mechanism for opening and closing the lid can be omitted.

[0075] Because it is biased in the closing direction, it can suppress the intrusion of liquids such as rainwater into the upstream area. When cooling air is supplied from the cooling unit, the opening door is held open by the cooling air, allowing exhaust to be performed via the vertical exhaust hood.

[0076] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. [Explanation of Symbols]

[0077] 1 Load Testing Device 1 1a-1c: First load test section to third load test section 2. Base 2a~2c 1st base~3rd base 3a-3c Case 1-3 10a~10c 1st resistance section ~ 3rd resistance section 10a1~10c1 Wind Tunnel Duct No. 11~Wind Tunnel Duct No. 31 10a2~10c2 Wind Tunnel Duct No. 12~Wind Tunnel Duct No. 32 30a~30c 1st cooling section~3rd cooling section 50a~50c First exhaust section~Third exhaust section 51a~51c First lateral exhaust duct~Third lateral exhaust duct 52a~52c First longitudinal exhaust hood~Third longitudinal exhaust hood 53a~53c First recess~Third recess 54a~54c 1st drainage section~3rd drainage section 55a~55c First opening / closing section~Third opening / closing section 56a~56c First drain section~Third drain section 57a~57c First guide vane~Third guide vane 58a~58c 1st Net~3rd Net d. Separation of 10 mm or more

Claims

1. The resistive section, A cooling unit that supplies cooling air to the resistance unit from below, A load testing apparatus comprising an exhaust section having a lateral exhaust duct for guiding the air discharged from the resistance section in a lateral direction, and a vertical exhaust hood for guiding the air discharged from the lateral exhaust duct in a vertical direction.

2. The load testing apparatus according to claim 1, wherein the vertical exhaust hood is provided with a recess for collecting liquid that has entered from above the vertical exhaust hood, located at a position lower than the connection point between the vertical exhaust hood and the horizontal exhaust duct.

3. The load testing apparatus according to claim 2, wherein a drainage section including a drain port and a drain is provided at the lower end of the recess.

4. An opening / closing section is provided on at least one of the intake side of the vertical exhaust hood and the exhaust side of the horizontal exhaust duct. The opening / closing section includes an opening / closing door that is biased in a closing direction to block the flow of air and is opened by the air discharged from the resistance section. The load testing apparatus according to claim 1, wherein the opening / closing section includes a rotation stopper that prevents the opening / closing door from opening too far and narrowing the opening of an adjacent opening / closing door when the opening / closing door is opened by the air discharged from the resistance section.

5. The load testing apparatus according to claim 4, wherein a water drainage section including a wall is provided upstream of the opening / closing section on at least one of the intake side of the vertical exhaust hood and the exhaust side of the horizontal exhaust duct.

6. The load testing apparatus according to claim 1, wherein guide vanes are provided inside the lateral exhaust duct to guide the air discharged from the resistance section toward the side where the vertical exhaust hood is located.

7. The aforementioned load testing apparatus is used to perform load testing on a power supply under test with a high voltage of 6 kV or higher. A wind tunnel duct is provided between the resistance section and the exhaust section to guide the air discharged from the resistance section to the exhaust section. The aforementioned wind tunnel duct is made of insulating material. The load testing apparatus according to claim 1, wherein a gap of 10 mm or more is provided between the case holding the resistance unit and the wind tunnel duct.

8. The load testing apparatus according to claim 1, wherein a net is provided at the exhaust-side opening of the vertical exhaust hood.

9. The resistive section, A cooling unit that supplies cooling air to the resistance section from the side, The exhaust section includes a vertical exhaust hood that guides the air discharged from the resistance section in a vertical direction, A load testing apparatus comprising a vertical exhaust hood provided with a recess for collecting liquid that has entered from above the vertical exhaust hood, located at a position lower than the area connected to the resistance section.

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