Relay, device including a relay, load test device including a relay

Abstract

The present application provides a relay or the like in which generation of an adverse situation is easily prevented. A relay RS includes a fixed contact 41, a movable contact 42, a reset member 42b of the movable contact 42, and a housing 46 that covers the fixed contact 41, the movable contact 42, and the reset member 42b. The housing 46 is made of a material that is transparent or has light transmittance. The relay RS also includes a catch portion 42d that holds a molten slag generated by separation and engagement of the fixed contact 41 and the movable contact 42 at a position that is higher than the reset member 42b and lower than the fixed contact 41. The relay RS also includes a cover 49 that covers a portion of a terminal connected to the fixed contact 41 that is exposed from the housing 46. When the cover 49 is attached to the housing 46, at least a portion of the housing 46 is not covered by the cover 49 and is exposed.

Description

TECHNICAL FIELD

[0001] The present application relates to a relay or the like. BACKGROUND

[0002] Conventionally, a relay for on-off control of power supply to an electric component has been proposed as in Patent Document 1.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENT

[0005] Patent Document 1: Japanese Patent Application Publication No. 2010-025752 SUMMARY

[0006] However, a relay that frequently performs on-off control is likely to cause a malfunction.

[0007] Therefore, an object of the present application is to provide a relay or the like that is likely to prevent a malfunction from occurring.

[0008] The relay according to the present application includes a fixed contact, a movable contact, a reset member of the movable contact, and a housing that covers the fixed contact, the movable contact, and the reset member. The housing is made of a transparent or light-transmissive material.

[0009] In a case where the housing is made of a transparent or light-transmissive material, the state of movement of the movable contact or the like can be visually confirmed from the outside of the housing.

[0010] By visually confirming the state of the inside of the housing, it is easy to determine whether to replace the relay or the like with a new one, and it is easy to prevent a malfunction of the relay.

[0011] Preferably, the relay further includes a catch tray portion that holds a molten slag generated by the separation and engagement of the fixed contact and the movable contact at a position that is higher than the reset member and lower than the fixed contact.

[0012] A molten slag or the like generated by an arc at the time of contact or separation of the fixed contact and the movable contact is likely to fall downward.

[0013] The molten slag hinders the movement of a component below, and is likely to cause the separation and engagement movement of the fixed contact and the movable contact to not be performed normally.

[0014] The molten slag or the like is prevented from falling downward by being received by the catch tray portion. Thus, it is easy to maintain the normal separation and engagement movement of the fixed contact and the movable contact.

[0015] Further preferably, the relay further includes a cover that covers a portion of a terminal exposed from the housing that is connected to the fixed contact. When the cover is attached to the housing, at least a portion of the housing is not covered by the cover but is exposed.

[0016] The terminal is covered by the cover, so the metal exposed part of the terminal can be eliminated, and the possibility of short circuit between the terminals can be reduced.

[0017] In addition, preferably, the lower part of the housing is installed on the horizontal surface in such a way that the fixed contact is located higher than the reset member.

[0018] The relay is installed on the horizontal surface of the fixed part in such a way that the fixed contact and the movable contact are located upward.

[0019] Thus, the movable contact can perform a prescribed action in a state where it is difficult to be affected by gravity or stop at a prescribed position.

[0020] In addition, preferably, in the device including the relay, a sensor part including a vibration sensor that monitors the vibration of the inside of the housing is provided in the fixed part including the horizontal surface.

[0021] In addition, preferably, a sensor part including at least one of a temperature sensor that monitors the temperature of the housing and a vibration sensor that monitors the vibration of the inside of the housing is provided in the housing.

[0022] Further preferably, the relay is in an open state where the fixed contact and the movable contact are not in contact when open, and in a closed state where the fixed contact and the movable contact are in contact when closed. A diode is electrically connected to the end of the coil of the driving member that moves the movable contact.

[0023] Thus, the flow direction of the current flowing in the coil of the driving member can be made constant, the magnetic pole of the electromagnet can be made constant, and the force of the electromagnet that causes the reset member to approach can be made constant.

[0024] In addition, in the case where the flow direction of the current flowing in the coil of the driving member is wrong due to a mistake in the wiring, the movable contact can be prevented from performing an action in such a way as to be in contact with the fixed contact.

[0025] Further preferably, an impact absorbing part having conductivity and including an elastic member is provided on one of the fixed contact and the movable contact. The fixed contact and the movable contact are electrically connected by the impact absorbing part.

[0026] The impact when the fixed contact and the movable contact are in contact can be absorbed by the expansion and contraction of the elastic member of the impact absorbing part.

[0027] In addition, the fixed contact and the movable contact can be more firmly maintained in a contact state (maintained in a closed state).

[0028] In addition, preferably, a magnetic yoke is provided on at least one of the inside and the outside of the coil of the driving member that moves the movable contact.

[0029] Thus, the adhesion of the driving member can be improved.

[0030] Further preferably, the load testing device is provided with a resistor and a relay according to the present application for on-off control of power supply to the resistor.

[0031] As described above, according to the present application, a relay or the like that is less likely to cause a malfunction can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a perspective view showing the structure of the load testing device of the present embodiment.

[0033] Figure 2 is a schematic view showing the structure of the load testing device.

[0034] Figure 3 is a schematic view showing the circuit structure of the resistor section.

[0035] Figure 4 is a perspective view of the relay as viewed from below.

[0036] Figure 5 is a perspective view of the relay as viewed from the rear.

[0037] Figure 6 is a right view of the relay.

[0038] Figure 7 is a sectional view of the relay in the off state as viewed from the right side.

[0039] Figure 8 is a sectional view of the relay in the on state as viewed from the right side.

[0040] Figure 9 is a sectional view of the relay in the off state as viewed from the rear.

[0041] Figure 10 is a sectional view of the relay in the on state as viewed from the rear.

[0042] Figure 11 is a sectional view of the relay in the off state as viewed from above.

[0043] Figure 12 is a sectional view of the relay in the on state as viewed from above.

[0044] Figure 13 is a right view of the relay in the off state using a transparent housing.

[0045] Figure 14 is a rear view of the relay in the off state using a transparent housing.

[0046] Figure 15 It is a 3D view of a relay with a cover installed.

[0047] Figure 16 This is a cross-sectional view of the covered relay viewed from the rear.

[0048] Figure 17 This is a perspective view showing the state of the four U-phase relays and sensor units with covers installed on the fixed part.

[0049] Figure 18 This is a schematic diagram showing the structure of the operating unit.

[0050] Figure 19 This is a schematic diagram showing the structure of the control unit in which the display device is installed.

[0051] Figure 20 This is a side view of the low-voltage load test apparatus using relay anomaly monitoring in this embodiment.

[0052] Figure 21 This is a side view of the high-voltage load test apparatus using relay anomaly monitoring in this embodiment.

[0053] Figure 22 This is a schematic diagram showing the structure of the operating unit, including the emergency stop switch.

[0054] Figure 23 This is a cross-sectional view of a relay with an impact absorption section in the off state, viewed from the right side.

[0055] Figure 24 This is a cross-sectional view of a relay with an impact absorption section in the on state, viewed from the right side.

[0056] Figure 25 This is a right view of the relay in its off state, using a housing made of transparent material in area 1. Detailed Implementation

[0057] Hereinafter, this embodiment will be described with reference to the accompanying drawings.

[0058] Furthermore, the implementation methods are not limited to the following embodiments. Additionally, the content described in one embodiment is generally applicable to other embodiments as well. Furthermore, the various embodiments and their variations can be appropriately combined.

[0059] The load testing apparatus 1 includes a cooling fan 10, a resistor unit 20, a housing 30, a main switch 50, an operation unit 60, and a control unit 80, and is used for load testing of power supply devices such as generators (the power supply to be tested). Figures 1-22 ).

[0060] (Cooling Fan 10)

[0061] The cooling fan 10 is a device for supplying cooling air to the resistor section 20, which is located on the upper part of the cooling fan 10.

[0062] (Resistor section 20)

[0063] One or more resistor groups are provided in the resistor section 20. The resistors constituting the resistor group are rod-shaped extending horizontally, and multiple such resistors are arranged at predetermined intervals and connected in series or in parallel with other resistors. During load testing, power from the power source of the test object is supplied to some or all of the resistors in the resistor group.

[0064] Resistors are not limited to being made of heating wires; they can also be structures that can store electricity internally, such as batteries.

[0065] In this embodiment, an example is shown: a structure for load testing of a three-phase AC power supply is provided with a total of four resistor groups, including two resistor groups with a rated capacity of 5kW (resistor group 1 G1 and resistor group 2 G2) and two resistor groups with a rated capacity of 10kW (resistor group 3 G3 and resistor group 4 G4).

[0066] Each resistor group includes: two resistors (R1 and R2) connected in series with the U-phase resistor connected to the R-phase terminal of the power supply to the test object; two resistors (R3 and R4) connected in series with the V-phase resistor connected to the S-phase terminal of the power supply to the test object; and two resistors (R5 and R6) connected in series with the W-phase resistor connected to the T-phase terminal of the power supply to the test object. Additionally, a relay RS is provided between resistors R1 and R2, R3 and R4, and R5 and R6.

[0067] Corresponding to the on / off operations of switches S1 to S4 described later, the relay RS is controlled to switch on and off. When relay RS is in the on state, it is configured to allow current to flow in the corresponding resistor.

[0068] The relay RS can be a three-pole switch in which the relays for the U-phase, V-phase, and W-phase work together to perform the switching action, or it can be a single-pole switch in which the relays for the U-phase, V-phase, and W-phase work separately to perform the switching action.

[0069] Details about the relay RS will be described later.

[0070] One terminal of the second resistor R2 in each resistor group is connected to the U-phase line UB in the cable (test power cable) c1 that electrically connects the test object power supply and the resistor section 20. The U-phase line UB extends from the U-phase terminal U1 that is connected to the R-phase terminal of the test object power supply.

[0071] One terminal of the fourth resistor R4 in each resistor group is connected to the V-phase line VB in the power cable c1 of the test object. The V-phase line VB extends from the V-phase terminal V1, which is connected to the S-phase terminal of the power supply of the test object.

[0072] One terminal of the sixth resistor R6 in each resistor group is connected to the W-phase line WB in the power cable c1 of the test object. The W-phase line WB extends from the W-phase terminal W1, which is connected to the T-phase terminal of the power supply of the test object.

[0073] One terminal of resistor R1, one terminal of resistor R3, and one terminal of resistor R5 in each resistor group are short-circuited.

[0074] However, the number of resistor groups, the rated voltage of each resistor group, the rated capacity of each resistor group, and the wiring of resistors and relays are not limited to the above structure.

[0075] (Shell 30)

[0076] The housing 30 holds the components that constitute the load testing device 1, including the cooling fan 10, resistor 20, main switch 50, operation unit 60, and fixed control device 81 of control unit 80, and is excluding the portable terminal including the mobile control device 82. An air inlet 31 is provided on the side (upstream) below the cooling fan 10 of the housing 30, and an exhaust port 33 is provided above (downstream) the resistor 20.

[0077] An air intake cover 32 is provided at the air intake 31, which opens when in use and closes when not in use. An exhaust cover 34 is provided at the exhaust outlet 33, which opens when in use and closes when not in use.

[0078] The air intake cover 32 is opened and closed by means of a first actuator 32a that operates in conjunction with the on / off action of the operation unit 60. In addition, it is not limited to automatic opening and closing using the first actuator 32a, the air intake cover 32 can also be opened and closed manually.

[0079] The exhaust cover 34 is opened and closed by means of a second actuator 34a that operates in conjunction with the on / off action of the operation unit 60. In addition, it is not limited to automatic opening and closing using the second actuator 34a; the exhaust cover 34 can also be opened and closed manually.

[0080] In this embodiment, the intake cover 32 and the exhaust cover 34 are described as being constructed as hinged swing doors, but they may also be constructed as sliding doors or other door structures.

[0081] In addition, in this embodiment, the following method is described: the cooling fan 10 is disposed at the bottom, the resistor 20 is disposed at the top, and the cooling air flows from the bottom to the top.

[0082] However, it is also possible to arrange the cooling fan 10 and the resistor 20 in a horizontal direction, with the cooling air flowing in a horizontal direction.

[0083] In this case, the upper surface of the resistor 20 can be used as the fixing part 48 described later, and the relay RS can be disposed on the upper surface of the resistor 20.

[0084] (Relay RS)

[0085] The relay RS has a fixed contact 41, a movable contact 42, a reset component 42b, a receiving portion 42d, a partition wall 43, a drive component 45, a diode 45c, a magnetic yoke 45d, a housing 46, a mounting portion 47, a cover 49, etc. (see reference) Figures 4-17 ).

[0086] The relay RS is preferably configured with the following contact type: when disconnected, it is in an open state where the fixed contact 41 and the movable contact 42 are not in contact, and when connected, it is in a closed state where the fixed contact 41 and the movable contact 42 are in contact.

[0087] The fixed contact 41 is made of conductive components.

[0088] One terminal (first terminal 41a) of the fixed contact 41 of the U-phase relay RS protruding outwards from the housing 46 is connected to the other terminal of the first resistor R1. The other terminal (second terminal 41b) of the fixed contact 41 of the U-phase relay RS protruding outwards from the housing 46 is connected to the other terminal of the second resistor R2.

[0089] One terminal (terminal 41a) of the fixed contact 41 of the V-phase relay RS protruding outwards from the housing 46 is connected to the other terminal of the third resistor R3. The other terminal (terminal 41b) of the fixed contact 41 of the V-phase relay RS protruding outwards from the housing 46 is connected to the other terminal of the fourth resistor R4.

[0090] One terminal (terminal 41a) of the fixed contact 41 of the W-phase relay RS protruding outwards from the housing 46 is connected to the other terminal of the fifth resistor R5. The other terminal (terminal 41b) of the fixed contact 41 of the W-phase relay RS protruding outwards from the housing 46 is connected to the other terminal of the sixth resistor R6.

[0091] The power cable provided between the other terminal of the first resistor R1 and the first terminal 41a of the relay RS, between the other terminal of the third resistor R3 and the first terminal 41a of the relay RS, and between the other terminal of the fifth resistor R5 and the first terminal 41a of the relay RS is defined as the first power cable C1a.

[0092] The power cable installed between the other terminal of the second resistor R2 and the second terminal 41b of the relay RS, between the other terminal of the fourth resistor R4 and the second terminal 41b of the relay RS, and between the other terminal of the sixth resistor R6 and the second terminal 41b of the relay RS is defined as the second power cable C1b.

[0093] One side of the fixed contact 41 is defined as the fixed contact 41c on the side of the first terminal 41a.

[0094] The other side of the fixed contact 41 is defined as the fixed contact 41d on the side of the second terminal 41b.

[0095] Regarding the relay RS, in order to explain the direction, the horizontal direction (left and right direction) is defined as the x direction, the horizontal direction perpendicular to the x direction (front and back direction) is defined as the y direction, and the direction perpendicular to both the x and y directions (up and down direction) is defined as the z direction.

[0096] exist Figure 4 In this context, the directions indicated by the arrows on the x, y, and z axes are defined as left, front, and top, respectively.

[0097] Terminal 41a is located on the left side of housing 46 in the x direction. Terminal 41b is located on the right side of housing 46 in the x direction.

[0098] (Modible contact 42)

[0099] The movable contact 42 is driven by a drive member 45 including a coil. This drive enables switching between an on state, in which the movable contact 42 contacts the fixed contact 41, and an off state, in which the movable contact 42 does not contact the fixed contact 41.

[0100] The movable contact 42 is made of a conductive component and is held in the movable contact holding part 42a.

[0101] The movable contact holding part 42a is composed of a non-conductive component (insulating component) and is held by the reset component 42b.

[0102] The reset component 42b is held by the base 42c.

[0103] (Reset component 42b)

[0104] The reset component 42b is composed of a leaf spring, a helical spring, and other reset springs, and applies force in the opening direction.

[0105] The movable contact holding part 42a and the movable contact 42 are tilted and positioned in a direction separate from the fixed contact 41 by the force of the reset member 42b.

[0106] At least one of the portion of the movable contact holding part 42a that contacts the reset member 42b and at least one of the portion of the reset member 42b that contacts the movable contact holding part 42a is made of a magnetic body attached to a magnet.

[0107] If current flows in the coil of the drive component 45, the reset component 42b closes due to magnetic force. When the movable contact holding part 42a and the movable contact 42 are in an upright state, the movable contact 42 contacts the fixed contact 41.

[0108] The movable contact holding part 42a is positioned such that the rod-shaped portion of the movable contact holding part 42a is tilted at an angle rather than parallel to the z-direction (see reference). Figure 7 and a state roughly parallel to the z-direction (refer to) Figure 8 It moves by changing between ( ).

[0109] That is, the movable contact 42 and the movable contact holding part 42a move in such a way that the angle between the rod-shaped part of the movable contact holding part 42a and the xz plane changes.

[0110] (Receiving section 42d)

[0111] The movable contact 42 is configured to be positioned higher in the z-direction than the reset component 42b.

[0112] A receiving portion 42d is provided on the inner side of the housing 46, at a position that is lower in the z-direction than the movable contact 42 and higher in the z-direction than the reset member 42b.

[0113] The receiving portion 42d receives the molten slag generated by the electric arc when the fixed contact 41 and the movable contact 42 separate and engage, so that it does not fall downward in the z direction.

[0114] The receiving part 42d is installed on the inner wall of the outer casing 46, etc.

[0115] The receiving portion 42d is blocked by the space above and below the z-direction, except for the hole A1 provided in the area that physically interferes with the moving area of ​​the movable contact holding portion 42a.

[0116] (Setting the receiving section to 42d effect)

[0117] Molten slag and other debris generated by the electric arc when the fixed contact 41 and the movable contact 42 come into contact or separate may fall downward in the z direction.

[0118] If molten slag reaches the reset component 42b or the drive component 45, it will hinder the operation of these components and may cause the separation and engagement of the fixed contact 41 and the movable contact 42 to fail to proceed normally.

[0119] In this embodiment, the receiving portion 42d receives molten slag and the like, thereby preventing it from falling downwards in the z-direction. Therefore, it is easy to maintain the normal separation and engagement of the fixed contact 41 and the movable contact 42.

[0120] (Divider 43)

[0121] The partition wall 43 is made of a non-magnetic material such as resin and is disposed between the component (base 42c) at the lower end of the movable contact 42 in the z direction and the upper end of the drive component 45 in the z direction.

[0122] The base 42c can be omitted and the reset component 42b can be directly installed on the partition wall 43.

[0123] Alternatively, partition wall 43 can be omitted.

[0124] (Drive component 45)

[0125] The driving component 45 is composed of an electromagnet including a coil, which uses magnetic force to move the movable contact 42.

[0126] The drive unit 45 is connected to the fixed control device 81 of the control unit 80 via wires (first control cable C2a, second control cable C2b).

[0127] The drive unit 45 receives power via wires (first control cable C2a, second control cable C2b).

[0128] The drive unit 45 performs motion control (switching control between on and off states) using the fixed control device 81. However, the drive unit 45 may also be configured to be connected to the operation unit 60 via wires (first control cable C2a, second control cable C2b).

[0129] The first control cable C2a is connected to the third terminal 45a, which extends from one end of the coil of the drive component 45.

[0130] The second control cable C2b is connected to the fourth terminal 45b, which extends from the other end of the coil of the drive component 45.

[0131] A diode 45c is provided at least one of the ends of the coil of the driving component 45 between the third terminal 45a and the other end of the coil between the fourth terminal 45b. That is, preferably, the diode 45c is electrically connected to the end of the coil.

[0132] In this embodiment, an example is shown where a diode 45c is disposed between one end of the coil of the driving component 45 and the third terminal 45a (see reference). Figure 7 wait).

[0133] (Effect of setting diode 45c)

[0134] This ensures that the direction of the current flowing in the coil of the drive member 45 is constant, the magnetic poles of the electromagnet are constant, and the force that brings the reset member 42b closer based on the electromagnet does not change.

[0135] Furthermore, in the event that the current flowing in the coil of the drive component 45 is directed in the wrong direction due to wiring errors, it is possible to prevent the movable contact 42 from making contact with the fixed contact 41 during operation.

[0136] Preferably, a magnetic yoke (yoke iron) 45d made of a magnetic body is provided on at least one of the inner and outer sides of the coil of the driving component 45, so as to improve the magnetic force.

[0137] In this embodiment, an example is shown where a magnetic yoke 45d is provided inside the coil of the drive component 45.

[0138] (The effect of setting the yoke to 45d)

[0139] This improves the attraction force of at least one of the magnetically formed portion of the drive member 45, the movable contact holding portion 42a that contacts the reset member 42b, and the portion of the reset member 42b that contacts the movable contact holding portion 42a.

[0140] (Outer casing 46, Mounting part 47)

[0141] The outer shell 46 is made of insulating components such as ceramic and has an approximately hollow cylindrical shape that is open at the lower end in the z-direction and closed at the upper end in the z-direction. In this embodiment, as a specific example of the approximately hollow cylindrical shape, the outer shell 46 has an approximately hollow quadrangular prism shape.

[0142] The inner side of the housing 46 is provided with a fixed contact 41, a movable contact 42, a reset component 42b, a receiving plate 42d, a partition wall 43, and a drive component 45.

[0143] A base 46a with a flange-shaped edge is provided below the outer casing 46 in the z direction, and a mounting part 47 is provided below the base 46a in the z direction.

[0144] The base 46a and the mounting part 47 are integrally formed of metal or the like, and enclose the lower end of the outer casing 46 in the z direction.

[0145] The base 46a and the housing 46 are fixed together by adhesive or welding.

[0146] Threads are cut into the side of the mounting part 47.

[0147] A third terminal 45a and a fourth terminal 45b are provided on the lower surface of the mounting part 47.

[0148] Inert gas is preferably filled around the area where the fixed contact 41 and the movable contact 42 are in contact, that is, in the space surrounded by the housing 46 and the partition wall 43, or in the space surrounded by the housing 46 and the base 46a or the mounting part 47.

[0149] The inert gas is filled through a hole (not shown) provided at the lower end of the mounting part 47 in the z direction, and the hole is sealed after filling.

[0150] The outer shell 46 is preferably made of a transparent material or a light-transmitting material.

[0151] Here, "transparency" refers to the property of a substance that allows light to pass through, having extremely high transmittance and the ability to see through the substance to its opposite side.

[0152] Therefore, when the outer casing 46 is made of a transparent material, such as Figure 13 and Figure 14 As shown, the movable contact 42 and other components disposed inside the housing 46 can be clearly seen through the housing 46 from the outside of the housing 46.

[0153] also, Figure 13 The side terminal portion (second terminal 41b) is omitted.

[0154] In addition, "transmittance" refers to the following property: although it has the property of allowing light to pass through, like "transparent", it is different from "transparent" in that the light is diffused or the transmittance is low, so the shape of the opposite side cannot be clearly identified through its material.

[0155] Therefore, even when the outer shell 46 is made of a light-transmitting material, although it does not achieve... Figure 13 andFigure 14 However, the movable contact 42 and other components disposed inside the housing 46 can be seen through the housing 46 from the outside of the housing 46.

[0156] (Effects such as setting the outer shell 46 to transparent)

[0157] When the housing 46 is made of a transparent material or a light-transmitting material, the operating state of the movable contact 42 and the amount of slag and the like accumulated above the z-direction of the receiving portion 42d can be visually confirmed from the outside of the housing 46.

[0158] By visually inspecting the internal condition of the housing 46, it is easy to determine whether to replace it with a new relay RS, and it is easy to prevent malfunctions of the relay RS.

[0159] Figure 13 and Figure 14 An example is shown where the entire housing 46 is made of a transparent or light-transmitting material. However, it is also possible that a portion of the housing 46, specifically the area where the fixed contact 41, the movable contact 42, and the receiving plate portion 42d in the z-direction are visible (first region 461), is made of a transparent or light-transmitting material, while the remaining area of ​​the housing 46 (second region 462) is made of a non-transparent material (see reference). Figure 25 ).

[0160] also, Figure 25 The side terminal portion (second terminal 41b) is omitted.

[0161] Even in this case, the operating state of the movable contact 42 and the amount of slag accumulated above the z-direction of the receiving portion 42d can be visually confirmed from the outside of the first region 461 of the housing 46.

[0162] Furthermore, after the receiving portion 42d is installed near the lower end of the first region 461 in the z direction, if the second region 462 is installed on the first region 461, the receiving portion 42d can be easily installed inside the housing 46.

[0163] Region 1 461 and Region 2 462 can be fixed by bonding or welding, or by screwing.

[0164] (Cover 49)

[0165] Preferably, a cover 49 is provided on the first terminal 41a connected to one side of the fixed contact 41 and the second terminal 41b connected to the other side of the fixed contact 41, covering the metal portion and the portion exposed from the housing 46 (see reference). Figures 15-17 ).

[0166] The cover 49 is made of insulating materials such as rubber and resin.

[0167] (Setting the cover to 49 effect)

[0168] By covering the first terminal 41a and the second terminal 41b with the cover 49, the exposed metal portions of the first terminal 41a and the second terminal 41b can be eliminated, thereby reducing the possibility of a short circuit between the first terminal 41a and the second terminal 41b.

[0169] Regarding cover 49, the portion installed on the first terminal 41a and the portion installed on the second terminal 41b can be constructed separately or as a single unit.

[0170] However, in order to increase the portion of the housing 46 in contact with the outside air and to be able to visually confirm the internal condition of the housing 46 (temperature changes, changes in internal components, etc.), it is preferable that the cover 49 does not cover the entire housing 46 but covers a part of the housing 46.

[0171] In this case, when the cover 49 is installed on the housing 46, at least a portion of the housing 46 (e.g., the lower half of the housing 46) is exposed and not covered by the cover 49.

[0172] (Fixed part 48)

[0173] The relay RS is mounted on the fixed part 48.

[0174] The fixing part 48 has a horizontal plane perpendicular to the z-direction, so that the housing 46 is mounted on the upper surface of the z-direction of the horizontal plane.

[0175] When the relay RS is installed in the fixing part 48, the flange-shaped portion of the base 46a contacts the upper surface of the fixing part 48 in the z direction, and the mounting part 47 is inserted into the hole of the fixing part 48.

[0176] The nut (not shown) is screwed into the mounting part 47 from below in the z-direction, thereby mounting the relay RS to the mounting part 48 with the base 46a and the nut clamping the fixing part 48 in the z-direction.

[0177] The fixing part 48 is installed on the load test device 1 with the side for mounting the relay RS facing upwards.

[0178] (Effect of mounting relay RS on mounting part 48)

[0179] The relay RS is mounted on the horizontal surface of the fixing part 48, such that the fixed contact 41 and the movable contact 42 are located above the receiving part 42d and the driving member 45 in the z-direction.

[0180] Therefore, the movable contact 42 can perform a specified action or stop at a specified position when it is less affected by gravity.

[0181] Furthermore, it is possible to configure all relays RS to be mounted on a single mounting part 48.

[0182] Alternatively, the relay RS can be installed separately on multiple mounting parts 48.

[0183] For example, the following configuration can be considered: the fixing part 48 consists of three fixing plates, and the four relays RS for the U phase (relay RS for the first resistor group G1, relay RS for the second resistor group G2, relay RS for the third resistor group G3, and relay RS for the fourth resistor group G4) are mounted on the first fixing plate (the fixing part for the U phase) (see reference). Figure 17 The four RS relays for the V phase are mounted on the second mounting plate (V phase mounting part), and the four RS relays for the W phase are mounted on the third mounting plate (W phase mounting part).

[0184] (Sensor section 48a of the fixed section 48)

[0185] Preferably, the sensor part 48a is disposed on the fixing part 48 (see reference). Figure 17 ).

[0186] The sensor unit 48a monitors the vibration of the fixed part 48, that is, the vibration inside the housing 46 (based on the vibration of the separation and engagement of the fixed contact 41 and the movable contact 42), and sends the monitored vibration-related information to the fixed control device 81, etc.

[0187] The sensor section 48a has a vibration sensor that detects the vibration of the fixed section 48.

[0188] Specifically, the sensor unit 48a detects the vibration inside the housing 46 of the relay RS when at least one of the fixed contact 41 and the movable contact 42 is carbonized, causing the relay RS to fail to perform its operation normally; that is, the vibration caused by the impact generated when the fixed contact 41 and the movable contact 42 come into contact.

[0189] The abnormal vibration is detected in the following way: for example, the sensor unit 48a stores the normal vibration and the abnormal vibration in advance for the vibration of the relay RS. The sensor unit 48a determines whether the detected vibration is close to the abnormal vibration based on the vibration waveform, vibration frequency and the like.

[0190] The detection of this abnormal vibration can be performed continuously or in a manner that takes place within a specified time (e.g., 2 seconds) after the selector switch 60b is turned on or off.

[0191] In this case, the communication unit of the sensor unit 48a communicates with the fixed control device 81 to obtain information related to the on / off operation of the selection switch 60b.

[0192] The sensor unit 48a has a communication unit, which sends the information obtained by the sensor unit 48a (information on the vibration of the action when an abnormality is detected) to the fixed control device 81.

[0193] When the fixing part 48 is composed of multiple fixing plates, the identification information of the sensor part 48a provided on each fixing plate is also sent to the fixing control device 81.

[0194] Therefore, it can be determined that: the sensor unit 48a that detects abnormal operating vibration, i.e., the mounting plate of the relay RS that detects abnormal operating vibration.

[0195] The sensor unit 48a can be composed of an RF tag with a built-in vibration sensor and communication unit, or it can be composed of a vibration sensor and a communication unit that are separate components of the sensor unit 48a.

[0196] The wireless communication unit that enables wireless communication between the fixed control device 81 and the communication unit of the sensor unit 48a, and between the motion control device 82 and the communication unit of the sensor unit 48a, is not limited to the communication method of RF tags. For example, this wireless communication unit may also include a unit that transmits its own identification information to the outside while the wireless communication unit is in the on state, such as IEEE 802.15.1 (Bluetooth (registered trademark)) or IEEE 802.11 (wireless LAN).

[0197] The vibration detected by the sensor unit 48a may be detected when the relay RS is performing its normal operation, rather than when the relay RS is not performing its normal operation.

[0198] In this case, the communication unit of the sensor unit 48a communicates with the fixed control device 81 to obtain information related to the on / off operation of the selection switch 60b.

[0199] Even if the selector switch 60b is turned on and off, if the sensor unit 48a does not detect the specified vibration within the specified time afterward, it is determined that the relay RS is not performing its operation normally. The communication unit of the sensor unit 48a sends the information obtained by the vibration sensor of the sensor unit 48a (information that the vibration of the normal operation cannot be detected) to the fixed control device 81.

[0200] Alternatively, if the sensor unit 48a detects a specified vibration (vibration when the relay RS is operating normally), it determines that the relay RS is operating normally, and the communication unit of the sensor unit 48a sends the information obtained by the sensor unit 48a (information on the detection of vibration during normal operation) to the fixed control device 81.

[0201] If the selector switch 60b is turned on or off but the fixed control device 81 does not receive normal relay information, it is determined that the corresponding relay RS is not performing its function normally.

[0202] Furthermore, the sensor unit 48a is not limited to detecting a specified vibration to determine the abnormality of the relay RS. It can be configured to record the vibration when the relay RS performs an operation and send the information related to the vibration to the fixed control device 81 via the communication unit of the sensor unit 48a.

[0203] In this case, the fixed control device 81 determines whether the relay RS has performed its operation correctly based on information related to the vibration.

[0204] The control unit 80 (fixed control device 81) can also be used to determine the abnormality of the relay RS. However, in this case, whenever the selector switch 60b is turned on or off, normal relay information or information related to the vibration is received from the sensor unit 48a. Therefore, the load on the control unit 80 increases.

[0205] If the sensor unit 48a determines the abnormality of the relay RS, the relay abnormality information is only received from the sensor unit 48a to the control unit 80 when an abnormality is detected. Therefore, it is possible to suppress the increase of the load on the control unit 80.

[0206] (Main switch 50)

[0207] The main switch 50 is composed of a vacuum circuit breaker (VCB). The main switch 50 is connected between the resistor section 20 and the power supply of the test object (located on the U-phase line UB, V-phase line VB, and W-phase line WB). When the main switch 50 is in the ON state, it supplies power from the test object's power supply to the resistor section 20. When the main switch 50 is in the OFF state, it stops supplying power from the test object's power supply to the resistor section 20.

[0208] During the normal operation of the load test apparatus 1, the main switch 50 is turned on. If the control unit 80 (fixed control device 81) determines, based on information obtained from the sensor unit 48a, that one of the relays RS constituting the load test apparatus 1 is not operating normally (in case of detecting an abnormality), the main switch 50 is turned off, that is, the power supply from the test object power supply to the resistor unit 20 is stopped.

[0209] When the control is disconnected, power can continue to be supplied to the fixed control device 81 and the operation unit 60 from the drive power supply (auxiliary power supply) of the load test device; however, power supply to the cooling fan 10 is stopped. However, in order to adequately cool the resistor 20, it is preferable to stop supplying power to the cooling fan 10 after a constant time (e.g., after 5 minutes) after the disconnection control begins to stop supplying power to the resistor 20.

[0210] (Operations Department 60)

[0211] The operation section 60 is provided with: an on / off operation switch 60a that turns the power supply of the load test device 1 on or off, and a selection switch 60b (first switch S1 to fourth switch S4) that adjusts the load (selects the resistor group powered by the power supply of the test object).

[0212] If the on / off operation switch 60a is operated to turn on the main power supply of the load test device 1, the first actuator 32a is activated by the power supplied from the drive power supply (auxiliary power supply) of the load test device via the cable (auxiliary power supply cable) c2 that connects the drive power supply (auxiliary power supply) of the load test device to the cooling fan 10. The second actuator 34a is activated by the power supplied from the drive power supply (auxiliary power supply) of the load test device, opening the air inlet cover 32 and the exhaust cover 34. The cooling fan 10 rotates, sending air from the opening (air inlet 31) of the air inlet cover 32 into the upper resistor section 20. Additionally, the stationary control device 81 is activated by the power supplied from the drive power supply (auxiliary power supply) of the load test device 1.

[0213] In this embodiment, the method of enabling the sensor unit 48a to operate using the built-in battery has been described. However, it is also possible to operate the sensor unit 48a based on power supplied from the power supply for driving the load test device 1.

[0214] It can also be configured as follows: the on / off switch for the cooling fan 10 is provided separately from the on / off operation switch 60a. When the on / off operation switch 60a is operated to turn on the main power supply of the load test device 1, the on / off switch for the cooling fan 10 is operated to start the fan of the cooling fan 10 to rotate.

[0215] After the main power supply of the load test apparatus 1 is turned on, if the selector switch 60b (first switch S1 to fourth switch S4) is operated to energize the resistor section 20, the main switch 50 is turned on. Furthermore, the relay RS corresponding to the resistor group selected by the energized selector switch 60b (first switch S1, etc.) is turned on, supplying power from the test power supply connected via the main switch 50 to the energized resistor group in the resistor section 20.

[0216] For example, when operating with switches S1 and S2 in the ON state and switches S3 and S4 in the OFF state, the relay RS for resistor group G1 and resistor group G2, with a rated capacity of 5kW corresponding to switches S1 and S2, is ON, supplying power from the test power source to resistor group G1 and resistor group G2. Conversely, the relay RS for resistor group G3 and resistor group G4, with a rated capacity of 10kW corresponding to switches S3 and S4, is OFF, and no power is supplied from the test power source to resistor group G3 and resistor group G4.

[0217] (Relay Abnormal Warning Unit 61)

[0218] The operation unit 60 is provided with a relay malfunction warning unit 61, which outputs a warning based on the state of the component (relay RS) corresponding to the relay malfunction warning unit 61 (see reference). Figure 18 ).

[0219] The relay abnormality warning unit 61 has a first warning unit 61a to a fourth warning unit 61d.

[0220] The first warning unit 61a is disposed near the first switch S1, corresponding to the relay RS of the first resistor group G1.

[0221] The second warning unit 61b is located near the second switch S2, corresponding to the relay RS of the second resistor group G2.

[0222] The third warning unit 61c is located near the third switch S3, corresponding to the relay RS of the third resistor group G3.

[0223] The fourth warning unit 61d is located near the fourth switch S4, corresponding to the relay RS of the fourth resistor group G4.

[0224] The first warning unit 61a has a first U-phase warning unit 61a1, a first V-phase warning unit 61a2, and a first W-phase warning unit 61a3.

[0225] The first U-phase warning unit 61a1 illuminates as a warning in case of abnormal vibration of the U-phase relay RS of the first resistor group G1 when the first switch S1 is operated.

[0226] The first U-phase warning unit 61a1 uses light to indicate the following situation: disconnection control is performed based on information obtained by the sensor unit 48a of the U-phase relay RS mounting part 48 (first mounting plate) on which the first resistor group G1 is mounted.

[0227] The first V-phase warning unit 61a2 illuminates as a warning in case of abnormal vibration of the V-phase relay RS of the first resistor group G1 when the first switch S1 is operated.

[0228] The first V-phase warning unit 61a2 uses light to indicate the following situation: it performs disconnection control based on information obtained by the sensor unit 48a of the fixing part 48 (second fixing plate) of the V-phase relay RS on which the first resistor group G1 is installed.

[0229] The first W-phase warning unit 61a3 illuminates as a warning in case of abnormal vibration of the W-phase relay RS of the first resistor group G1 when the first switch S1 is operated.

[0230] The first W-phase warning unit 61a3 uses light to indicate the following situation: disconnection control is performed based on information obtained by the sensor unit 48a of the fixing part 48 (third fixing plate) of the W-phase relay RS on which the first resistor group G1 is installed.

[0231] The second warning unit 61b has a second U-phase warning unit 61b1, a second V-phase warning unit 61b2, and a second W-phase warning unit 61b3.

[0232] The second U-phase warning unit 61b1 illuminates as a warning in case of abnormal vibration of the U-phase relay RS of the second resistor group G2 when the second switch S2 is operated.

[0233] The second U-phase warning unit 61b1 uses light to indicate the following situation: based on the information obtained by the sensor unit 48a of the U-phase relay RS with the second resistor group G2 installed on it, disconnection control is performed.

[0234] The second V-phase warning unit 61b2 illuminates as a warning in case of abnormal vibration of the V-phase relay RS of the second resistor group G2 when the second switch S2 is operated.

[0235] The second V-phase warning unit 61b2 uses light to indicate the following situation: it performs disconnection control based on information obtained by the sensor unit 48a of the fixing part 48 (second fixing plate) of the V-phase relay RS on which the second resistor group G2 is installed.

[0236] The second W-phase warning unit 61b3 illuminates as a warning in case of abnormal vibration of the W-phase relay RS of the second resistor group G2 when the second switch S2 is operated.

[0237] The second W-phase warning unit 61b3 uses light to indicate the following situation: it performs disconnection control based on information obtained by the sensor unit 48a of the fixing part 48 (third fixing plate) of the W-phase relay RS on which the second resistor group G2 is installed.

[0238] The third warning unit 61c has a third U-phase warning unit 61c1, a third V-phase warning unit 61c2, and a third W-phase warning unit 61c3.

[0239] The third U-phase warning unit 61c1 illuminates as a warning in case of abnormal vibration of the U-phase relay RS of the third resistor group G3 when the third switch S3 is operated.

[0240] The third U-phase warning unit 61c1 uses light to indicate the following situation: disconnection control is performed based on information obtained by the sensor unit 48a of the U-phase relay RS with the third resistor group G3 installed on it.

[0241] The third V-phase warning unit 61c2 illuminates as a warning in case of abnormal vibration of the V-phase relay RS of the third resistor group G3 when the third switch S3 is operated.

[0242] The third V-phase warning unit 61c2 uses light to indicate the following situation: it performs disconnection control based on the information obtained by the sensor unit 48a of the fixing part 48 (second fixing plate) of the V-phase relay RS on which the third resistor group G3 is installed.

[0243] The third W-phase warning unit 61c3 illuminates as a warning in case of abnormal vibration of the W-phase relay RS of the third resistor group G3 when the third switch S3 is operated.

[0244] The third W-phase warning unit 61c3 uses light to indicate the following situation: it performs disconnection control based on information obtained by the sensor unit 48a of the fixing part 48 (third fixing plate) of the W-phase relay RS on which the third resistor group G3 is installed.

[0245] The fourth warning unit 61d includes a fourth U-phase warning unit 61d1, a fourth V-phase warning unit 61d2, and a fourth W-phase warning unit 61d3.

[0246] The 4th phase U-phase warning unit 61d1 illuminates as a warning in case of abnormal vibration of the U-phase relay RS of the 4th resistor group G4 when the 4th switch S4 is operated.

[0247] The 4th U-phase warning unit 61d1 uses light to indicate the following situation: based on the information obtained by the sensor unit 48a of the U-phase relay RS with the 4th resistor group G4 installed, disconnection control is performed.

[0248] The 4th phase warning unit 61d2 illuminates as a warning in case of abnormal vibration of the V phase relay RS of the 4th resistor group G4 when the 4th switch S4 is operated.

[0249] The 4th V-phase warning unit 61d2 uses light to indicate the following situation: based on the information obtained by the sensor unit 48a of the fixing part 48 (2nd fixing plate) of the V-phase relay RS on which the 4th resistor group G4 is installed, disconnection control is performed.

[0250] The 4th phase warning unit 61d3 illuminates as a warning in case of abnormal vibration of the W phase relay RS of the 4th resistor group G4 when the 4th switch S4 is operated.

[0251] The 4th W-phase warning unit 61d3 uses light to indicate the following situation: it performs disconnection control based on information obtained by the sensor unit 48a of the fixing part 48 (3rd fixing plate) of the W-phase relay RS on which the 4th resistor group G4 is installed.

[0252] For example, if the operation of the V-phase relay RS of the first resistor group G1 malfunctions when the first switch S1 is operated, the first V-phase warning unit 61a2 in the first warning unit 61a is illuminated as a warning. At this time, the first V-phase warning unit 61a2 uses light to indicate the following situation: disconnection control is performed based on information obtained by the sensor unit 48a of the fixing part 48 (second fixing plate) on which the V-phase relay RS of the first resistor group G1 is mounted.

[0253] The relay abnormality warning unit 61 can be configured such that, in addition to the warning light (e.g., red), it can also light up with a different color (e.g., green) during normal operation.

[0254] (Control Department 80)

[0255] The control unit 80 includes a fixed control device 81.

[0256] The fixed control device 81 is a control device that is fixed inside the housing 30 that holds the resistor 20.

[0257] The fixed control device 81 is a device that controls various parts of the load test device 1, such as the relay RS, cooling fan 10, and main switch 50. In particular, after the fixed control device 81 monitors the operation status of the relay RS corresponding to the resistor group of the selector switch 60b (the first switch S1 to the fourth switch S4) using the sensor unit 48a, it performs the disconnection control of the main switch 50 (the disconnection control of the power supply from the test object power supply to the resistor unit 20).

[0258] That is, the fixed control device 81 performs disconnection control based on the information obtained by the sensor unit 48a.

[0259] The fixed control device 81, based on relay abnormality information from the sensor unit 48a, keeps the main switch 50 in the open state, stopping the power supply from the test object power supply to the resistance unit 20 of the load test device 1. In addition, the fixed control device 81 issues a warning stating "The relay RS is malfunctioning during switch operation."

[0260] Specifically, if a relay abnormality information is received from the sensor unit 48a installed in the fixing part 48, the fixing control device 81 determines that the fixing part in the fixing part 48 that was detected by the sensor unit 48a as abnormal vibration, and the switch in the selector switch 60b that was turned on and off just before the abnormal vibration was detected.

[0261] If the sensor section 48a of the first fixed plate detects abnormal vibration and performs a switching operation on the third switch S3 just before the abnormal vibration is detected, the fixed control device 81 determines that the relay RS corresponding to the third switch S3 and the relay used for the U phase is abnormal.

[0262] The fixed control device 81 illuminates the relay abnormality warning section in the relay abnormality warning section 61 that corresponds to the determined relay RS.

[0263] That is, the fixed control device 81 determines the relay RS that has not performed its operation properly based on the relay abnormality information from the sensor unit 48a and the operating state of the selector switch 60b, and performs disconnection control to stop the power supply from the test object power supply to the resistor unit 20.

[0264] As an example of a warning that "the relay RS is not operating properly during switch operation", the following method can be considered: the relay abnormality warning section in the relay abnormality warning section 61 located near the first switch S1 to the fourth switch S4 in the operation section 60, which corresponds to the relay RS that is more likely to cause a malfunction, is lit up.

[0265] Alternatively, it can be configured such that a display device 70 capable of displaying text is provided in the operation unit 60, for example, displaying a message such as "(The V-phase relay of the first resistor group corresponding to the first switch is malfunctioning, therefore) please check the relay corresponding to the first switch (the V-phase relay of the first resistor group)." (See reference) Figure 19 ).

[0266] (Effect of setting up sensor unit 48a)

[0267] If abnormal vibration is detected by the sensor section 48a of the mounting part 48 where the U-phase relay RS is installed, it can be determined that the U-phase relay RS is malfunctioning. Similarly, if abnormal vibration is detected by the sensor section 48a of the mounting part 48 where the V-phase relay RS is installed, it can be determined that the V-phase relay RS is malfunctioning. Likewise, if abnormal vibration is detected by the sensor section 48a of the mounting part 48 where the W-phase relay RS is installed, it can be determined that the W-phase relay RS is malfunctioning.

[0268] In addition, it is possible to identify the selector switch 60b that was switched on and off just before the abnormal vibration was detected, so it is also possible to specifically determine which relay RS is malfunctioning.

[0269] In this embodiment, it is not necessary to place the component (sensor 48a) for monitoring the abnormality of the relay RS on the power supply line between the power supply and the resistor 20 of the test object such as the U-phase line UB.

[0270] Therefore, the wiring of the power supply line to the resistor section will not be complicated, and the abnormality of the relay RS of the load test device 1 can be easily monitored.

[0271] Furthermore, the communication unit of the sensor unit 48a can be configured to communicate with the control unit 80 wirelessly or wiredly.

[0272] When communicating wirelessly with the control unit 80, without considering wiring, the abnormality monitoring of the relay RS can be performed simply by installing the sensor unit 48a on the fixing unit 48.

[0273] In particular, when the sensor unit 48a has a built-in battery that drives each part of the sensor unit 48a, neither a cable for sending control signals to the sensor unit 48a nor a cable for supplying power to the sensor unit 48a is required.

[0274] Therefore, the sensor section 48a can be easily placed in the area between the resistor R and the relay RS where complex wiring has been implemented.

[0275] (Sending to a portable terminal)

[0276] Furthermore, the control unit 80 that sends relay abnormal information from the sensor unit 48a is not limited to a control device (fixed control device 81) that is fixed in the housing 30 that holds the resistor unit 20, but can also be a control device (mobile control device 82) such as a portable terminal.

[0277] In this case, the sensor unit 48a and the motion control device 82 constitute the relay abnormality monitoring system of the load test device 1.

[0278] When relay abnormal information is sent from sensor unit 48a to portable terminal including mobile control device 82, the display unit of the portable terminal functions as relay abnormality warning unit 61 and displays information related to the relay RS that was detected to be abnormal.

[0279] For example, the following approach can be considered: Similar to display device 70, the display unit of the portable terminal displays the following message: "(The V-phase relay of the first resistor group corresponding to the first switch is not working properly, so) Please check the relay (V-phase relay of the first resistor group) corresponding to the first switch."

[0280] Furthermore, the control unit 80 can be configured to have only one of the fixed control device 81 and the mobile control device 82, or it can be configured to have both of the fixed control device 81 and the mobile control device 82.

[0281] It can be configured such that, when the control unit 80 has only a mobile control device 82 instead of a fixed control device 81, a warning output is given in response to the abnormal monitoring of the relay RS, but no disconnection control is performed.

[0282] Alternatively, it can be configured such that even when the control unit 80 has a fixed control device 81, a warning output is given in response to the abnormal monitoring of the relay RS, but no disconnection control is performed.

[0283] For example, the sensor unit 48a pre-records the operating vibration of the relay RS during normal operation, the operating vibration during abnormal operation, and the operating vibration between normal and abnormal operation. Based on the vibration waveform, vibration frequency, etc., the sensor unit 48a determines whether the detected operating vibration is close to the operating vibration during abnormal operation, close to the operating vibration during intermediate operation, or close to the operating vibration during normal operation, thereby detecting abnormal operating vibration.

[0284] When the detected vibration is close to an abnormal level, both the warning output and the disconnection control will be executed. When the detected vibration is close to an intermediate level, the warning output will be executed without disconnection control.

[0285] (Specific example of a load testing device)

[0286] Furthermore, the load testing apparatus 1 of this embodiment can be applied to... Figure 20 The low-voltage load test apparatus shown, corresponding to a low-voltage power supply, can also be used for... Figure 21 The high-voltage load test device shown is a high-voltage power supply corresponding to a high-voltage power source.

[0287] However, there is also a load test device 1 in which at least one of the air intake cover 32 and the exhaust cover 34 is omitted, and at least one of the air intake port 31 and the exhaust port 33 is always open. In this case, at least one of the first actuator 32a and the second actuator 34a is omitted (see reference). Figure 20 ).

[0288] In addition, warnings can be issued by visually confirming the warning through light output, by voice output, or by both parties.

[0289] (Emergency stop switch)

[0290] Furthermore, in this embodiment, a method for disconnecting control when an abnormality is detected in any part of the load test apparatus 1 is described.

[0291] However, when the load test device 1 issues a warning output but does not automatically disconnect, disconnection control can be performed according to the user's operation.

[0292] In this case, the operating unit 60 has an emergency stop switch 63 (see reference). Figure 22 ).

[0293] If the user operates the emergency stop switch 63, the fixed control device 81 will put the main switch 50 in the off state and stop the power supply from the test object to the resistor section 20.

[0294] At this time, the fixed control device 81 continues to supply power from the auxiliary power supply to the fixed control device 81 and the operation unit 60, and stops supplying power to the cooling fan 10. However, in order to adequately cool the resistor 20, it is preferable to stop supplying power to the cooling fan 10 after a constant time (e.g., after 5 minutes) after the disconnection control that stops supplying power to the resistor 20 is initiated.

[0295] (Impact Absorption Section 44)

[0296] In this embodiment, the direct contact between the fixed contact 41 and the movable contact 42 has been described. However, it can also be configured such that at least one of the fixed contact 41 and the movable contact 42 is provided with an impact-absorbing portion 44 that is conductive and includes an elastic member, thereby electrically connecting the fixed contact 41 and the movable contact 42 (see reference 42). Figure 23 , Figure 24 ).

[0297] Figure 23 and Figure 24 An example is shown where a shock-absorbing part 44, comprising an elastic component made of a spring, is installed at a fixed contact 41.

[0298] (Effect of setting up shock absorption section 44)

[0299] In this case, the impact when the fixed contact 41 and the movable contact 42 come into contact can be absorbed by the extension and retraction of the elastic member of the impact absorption part 44.

[0300] In addition, the movable contact 42 is separated from the fixed contact 41 by the force of the elastic member of the impact absorption part 44, and the movable contact 42 is brought closer to the fixed contact 41 by the magnetic force of the coil of the drive member 45.

[0301] By utilizing these opposing forces, the fixed contact 41 and the movable contact 42 can be more firmly maintained in contact (maintaining a closed state).

[0302] (Application example of sensor section 48a)

[0303] In addition, in this embodiment, the following example is described: a sensor part 48a is installed on the fixing part 48 on which the relay RS is installed.

[0304] However, the sensor unit 48a can be configured to be directly mounted on the housing 46 of the relay RS.

[0305] In this case, the sensor of sensor unit 48a can perform not only vibration-based anomaly monitoring, but also temperature-based anomaly monitoring, sound-based anomaly monitoring, and so on.

[0306] In this case, the sensor of the sensor unit 48a includes at least one of a temperature sensor that monitors the temperature of the housing 46 and a vibration sensor that monitors the vibration inside the housing 46 (based on the vibration generated by the separation and engagement of the fixed contact 41 and the movable contact 42).

[0307] As a temperature-based anomaly monitoring method, for example, the following approach can be considered: if the temperature on the surface of the housing 46 exceeds a temperature threshold, it can be determined that the relay RS is abnormal.

[0308] As a sound-based anomaly detection method, for example, the following approach can be considered: if the sound when the movable contact 42 moves due to the on / off control of the drive component 45 is different from the normal sound, it can be determined that the relay RS is abnormal.

[0309] (For applications other than load testing device 1)

[0310] In addition, in this embodiment, the following example is described: the relay RS is used to control the switching on and off of the power supply to the resistor of the load test device 1.

[0311] However, the relay RS can be used for on / off control of other devices.

[0312] In particular, even if the receiving plate 42d, the shock absorption section 44, the diode 45c, the magnetic yoke 45d, the housing 46 is made transparent, the relay RS is arranged on the horizontal surface, and the sensor section 48a is also used for the on / off control of other devices (including devices with relay RS), the same effect as that used for the load test device 1 can be obtained.

[0313] While several embodiments of the invention have been described, these embodiments are given by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other ways, 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 scope of the invention as described in the claims and its equivalents.

[0314] Explanation of reference numerals in the attached figures

[0315] 1. Load testing device

[0316] 10 Cooling Fans

[0317] 20 Resistor Section

[0318] 30. Housing

[0319] 31 Air Inlet

[0320] 32 Air intake cover

[0321] 32a First Actuator

[0322] 33 Exhaust port

[0323] 34 Exhaust Cover

[0324] 34a Second Actuator

[0325] 41 Fixed Contact

[0326] 41a, 41b Terminal 1, Terminal 2

[0327] 41c Fixed contact on the first terminal side

[0328] 41d Fixed contact on the second terminal side

[0329] 42 movable contacts

[0330] 42a Movable contact holding part

[0331] 42b Reset component

[0332] 42c base

[0333] 42d receiving section

[0334] 43. Partition wall

[0335] 44 Impact Absorbing Section

[0336] 45. Drive component (coil)

[0337] 45a, 45b 3rd terminal, 4th terminal

[0338] 45C diode

[0339] 45d magnetic yoke

[0340] 46. ​​Outer shell

[0341] 461 Area 1

[0342] 462 Area 2

[0343] 46a base

[0344] 47 Installation Department

[0345] 48 Fixing part

[0346] 48a Sensor Section

[0347] 49 lids

[0348] 50 Main Switch

[0349] 60 Operations Department

[0350] 60a On / Off Operation Switch

[0351] 60b Selector Switch

[0352] 61 Relay Abnormal Warning Section

[0353] Warning Sections 1 to 4, numbers 61a-61d

[0354] 61a1~61d1 Phase 1U Warning Unit~Phase 4U Warning Unit

[0355] 61a2~61d2 Phase 1V warning section~Phase 4V warning section

[0356] 61a3~61d3 Phase 1W Warning Unit~Phase 4W Warning Unit

[0357] 63 Emergency Stop Switch

[0358] 70 Display devices

[0359] 80 Control Department

[0360] 81 Fixed control device

[0361] 82. Mobility control device

[0362] A1 A hole is provided in the area that physically interferes with the moving area of ​​the movable contact holding part.

[0363] c1 Test object power cable

[0364] C1a Power Cable No. 1

[0365] C1b Second Power Cable

[0366] C2 Auxiliary power cable

[0367] C2a First Control Cable

[0368] C2b Second Control Cable

[0369] G1~G4 Resistor Group 1~4

[0370] R1 to R6, resistors 1 to 6

[0371] RS relay

[0372] Switches S1 to S4 (Switch 1 to Switch 4)

[0373] U1 U-phase terminal

[0374] UB U-phase wire

[0375] V1 V-phase terminal

[0376] VB V phase wire

[0377] W1 W phase terminal

[0378] WB W phase line

Claims

1. A relay characterized by comprising: a fixed contact; a movable contact; a reset member of the movable contact; and a housing covering the fixed contact, the movable contact, and the reset member, the relay being used for on-off control of power supply to a resistor from a high-voltage test object power supply in a load test device, a lower portion of the housing is installed on a horizontal plane in such a manner that the fixed contact is located higher than the reset member, the relay further comprises a catch portion that holds a slag generated by separation and engagement of the fixed contact and the movable contact at a position higher than the reset member and lower than the fixed contact, a first region of the housing is composed of a transparent or light-transmissive material so that the fixed contact, the movable contact, and the catch portion can be seen from above and from the side.

2. The relay according to claim 1, characterized by further comprising: a cover that covers a portion of a terminal connected to the fixed contact exposed from the housing, when the cover is installed on the housing, at least a portion of the housing is not covered by the cover and is exposed.

3. The relay according to claim 1, characterized by: a remaining region of the housing is a second region composed of a non-transparent material, the first region and the second region are fixed by adhesion or welding.

4. An apparatus characterized by: the apparatus includes the relay according to claim 3, a fixed portion including the horizontal plane is provided with a sensor portion including a vibration sensor that monitors vibration of an inside of the housing.

5. The relay according to claim 1, characterized by: the housing is provided with a sensor portion including at least one of a temperature sensor that monitors a temperature of the housing and a vibration sensor that monitors vibration of an inside of the housing.

6. The relay according to claim 1, characterized by: the relay is in an open state in which the fixed contact and the movable contact are not in contact when open, and in a closed state in which the fixed contact and the movable contact are in contact when closed, a diode is electrically connected to an end portion of a coil of a driving member that moves the movable contact.

7. The relay according to claim 1, characterized by: an impact absorbing portion having conductivity and including an elastic member is provided at one of the fixed contact and the movable contact, the fixed contact and the movable contact are electrically connected by the impact absorbing portion.

8. The relay according to claim 1, characterized by: a yoke is provided at at least one of an inner side and an outer side of a coil of a driving member that moves the movable contact.

9. A load test device characterized by comprising: a resistor; and the relay according to any one of claims 1 to 3, 5 to 6 for on-off control of power supply to the resistor. ​ ​

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