A test device for bypass switch of flexible direct current converter valve

Abstract

The present invention discloses a flexible direct current converter valve bypass switch test device, comprising a base, the upper end of the base is fixedly connected to a support frame, the lower end of the support frame is fixedly connected to a rectangular box, a placement cavity is provided in the rectangular box, a converter valve submodule is placed in the placement cavity, two rectangular cavities are provided in the rectangular box, the adjacent side spaces of the two rectangular cavities are connected to the placement cavity through two connecting ports, the adjacent side inner walls of the two rectangular cavities are rotatably connected to a second rotating rod, and the outer walls of the two second rotating rods are provided with a plurality of fan blades along their circumference. The device can judge whether the bypass switch is in a closed or disconnected state through an indicator light, and at the same time, when testing, the gas replacement around the converter valve submodule is accelerated by the coordination of exhaust and suction, thereby improving the heat dissipation effect of the converter valve submodule, and at the same time, through the setting of the serpentine pipe, the airflow entering the rectangular box is always in a low temperature state.

Description

Technical Field

[0001] The present invention relates to the field of converter valve detection, and in particular to a bypass switch testing device for a flexible direct current converter valve. Background Art

[0002] During the operation of the flexible DC converter valve submodule, if a submodule fails, the bypass switch of the submodule AC port needs to be closed to make the submodule short-circuited to ensure the stable operation of the modular multilevel converter. Therefore, the closing and bounce time of the bypass switch needs to be tested. However, the existing bypass switch test device still has the following problems when used:

[0003] When using the existing bypass switch testing device, the bypass switch is usually electrically connected to the converter valve submodule, and the closing and bouncing times are measured by testing the voltage change time after the converter valve submodule is short-circuited. However, during the test, the converter valve submodule will be in a short-circuit state, and the converter valve in the short-circuit state will generate a large amount of heat. The heat dissipation of the converter valve submodule on the existing bypass switch testing device mostly adopts the rotation of a fan, and uses airflow for heat dissipation. Since the heat generated by the converter valve submodule is large, the rotation of the fan may not be able to meet the heat dissipation requirements of the converter valve submodule. Therefore, it is necessary to design a new bypass switch testing device to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art, and a flexible direct current converter valve bypass switch test device is proposed. The device can judge whether the bypass switch is in a closed or open state through an indicator light. At the same time, when testing, the gas replacement around the converter valve submodule is accelerated by the coordination of exhaust and suction, thereby improving the heat dissipation effect of the converter valve submodule. At the same time, through the setting of the serpentine pipe, the air flow entering the rectangular box is always in a low temperature state.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A flexible direct current converter valve bypass switch test device, comprising a base, the upper end of the base is fixedly connected to a support frame, the lower end of the support frame is fixedly connected to a rectangular box, a placement cavity is provided in the rectangular box, a converter valve submodule is placed in the placement cavity, two rectangular cavities are provided in the rectangular box, adjacent side spaces of the two rectangular cavities are connected to the placement cavity through two connecting ports, adjacent side inner walls of the two rectangular cavities are rotatably connected to second rotating rods, the outer walls of the two second rotating rods are provided with a plurality of fan blades along their circumference, a drive motor is installed on the left inner wall of the rectangular cavity on the left, and the output shaft end of the drive motor is connected to the left inner wall of the rectangular cavity. The second rotating rod on the side is fixedly connected, the left side space of the rectangular cavity on the left is connected with the outside through an air inlet, and the right side of the rectangular cavity on the right is provided with an air outlet, and the air outlet is connected with an exhaust pipe; a transmission cavity is provided in the rectangular box, and the left and right inner walls of the transmission cavity are rotatably connected with the first rotating rod, the first rotating rod and the second rotating rod on the left are transmission-connected by the first transmission assembly, and the right side inner wall of the rectangular cavity on the right is rotatably connected with the third rotating rod, the third rotating rod and the second rotating rod on the right are both provided with gears meshing with each other, and the third rotating rod is transmission-connected with the first rotating rod through the second transmission assembly.

[0007] Preferably, the first transmission assembly includes a first transmission wheel arranged on the first rotating rod and the second rotating rod located on the left side, and the two first transmission wheels are connected by a first transmission belt. The second transmission assembly includes a second transmission wheel arranged on the first rotating rod and the third rotating rod, and the two second transmission wheels are connected by a second transmission belt.

[0008] Preferably, a placement groove is provided at the upper end of the base, a pressure plate is provided in the placement groove, the lower end of the pressure plate is elastically connected to the inner bottom of the placement groove through two first springs, and the lower end of the pressure plate and the inner bottom of the placement groove are both provided with contact pieces that cooperate with each other.

[0009] Preferably, a second electromagnet is provided at the inner top of the placement cavity, and the lower end of the second electromagnet is fixedly connected to two telescopic rods, the telescopic ends of the two telescopic rods are commonly fixedly connected to a temperature control box, and the temperature control box and the adjacent surface of the second electromagnet are elastically connected by two second springs.

[0010] Preferably, a slider is provided in the temperature control box, and the right side of the slider and the right inner wall of the temperature control box are fixedly connected with conductive blocks that cooperate with each other, the left space of the temperature control box is filled with a low-boiling point solution, and a thermal conductive plate is provided at the inner bottom of the temperature control box, and the lower end of the thermal conductive plate extends to the outside.

[0011] Preferably, a movable cavity is provided in the support frame, and a first electromagnet is slidably connected in the movable cavity, the first electromagnet is elastically connected to the inner bottom of the movable cavity by a third spring, the first electromagnet and the inner top of the movable cavity are jointly fixedly connected with a folding airbag, a water tank is provided at the upper end of the support frame, the folding airbag is connected to the right side space of the water tank through a water outlet pipe, the upper end of the folding airbag is connected to a three-way pipe, two vertical plates are fixedly connected to the inner top of the support frame, serpentine tubes are provided in the two vertical plates, the liquid inlet ends of the two serpentine tubes are connected to the bottom space of the water tank, the liquid outlet ends of the two serpentine tubes are connected to the three-way pipe, one-way valves are provided on the three-way pipe and the water outlet pipe, and two conductive sheets are provided on the left and right sides of the movable cavity.

[0012] Preferably, a socket is provided at the upper end of the base, and an indicator light is installed at the upper end of the support frame.

[0013] The present invention has the following beneficial effects:

[0014] 1. Compared with the prior art, by setting the indicator light, when the plug of the bypass switch is inserted into the socket, it can be judged whether the bypass switch is in an open or closed state according to the brightness of the indicator light;

[0015] 2. Compared with the prior art, when testing, the temperature control box will move down, so that the temperature conducting sheet will contact the converter valve submodule, so that the converter valve submodule can trigger the drive motor to power on when the temperature rises in the short circuit, so that the converter valve submodule can quickly cool down after the temperature rises;

[0016] 3. Compared with the prior art, by setting a plurality of fan blades in two rectangular cavities, during the heat dissipation process, the fan blades on the left blow the airflow into the placement cavity, and the airflow in the placement cavity can be drawn out by the fan blades on the right, thereby accelerating the gas flow in the placement cavity and improving the heat dissipation effect of the converter valve submodule;

[0017] 4. Compared with the prior art, the folded airbag is continuously stretched and contracted, so that low-temperature water flows in the two serpentine tubes, so that the airflow entering the placement cavity is in a low-temperature state, further improving the heat dissipation effect of the converter valve submodule. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a bypass switch test device for a flexible direct current converter valve proposed in the present invention;

[0019] Figure 2 for Figure 1 Schematic diagram of the internal structure;

[0020] Figure 3 for Figure 2A schematic diagram of the enlarged structure at A in the middle;

[0021] Figure 4 for Figure 2 A schematic diagram of the enlarged structure at B in the middle;

[0022] Figure 5 for Figure 2 Schematic diagram of the enlarged structure at point C in the middle.

[0023] In the figure: 1 base, 2 placement slot, 3 pressure plate, 4 contact piece, 5 first spring, 6 jack, 7 support frame, 8 indicator light, 9 water tank, 10 vertical plate, 11 serpentine pipe, 12 water outlet pipe, 13 exhaust pipe, 14 rectangular box, 15 first rotating rod, 16 first transmission assembly, 17 drive motor, 18 converter valve submodule, 19 second rotating rod, 20 fan blade, 21 gear, 22 third rotating rod, 23 second transmission assembly, 24 first electromagnet, 25 second spring, 26 temperature control box, 27 slider, 28 conductive block, 29 second electromagnet, 30 folding airbag, 31 liquid inlet pipe. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] Reference Figure 1-Figure 5A flexible direct current converter valve bypass switch test device comprises a base 1, wherein the upper end of the base 1 is fixedly connected to a support frame 7, and the lower end of the support frame 7 is fixedly connected to a rectangular box 14, wherein a placement cavity is arranged in the rectangular box 14, and a converter valve submodule 18 is placed in the placement cavity, and two rectangular cavities are arranged in the rectangular box 14, and the adjacent side spaces of the two rectangular cavities are connected to the placement cavity through two connecting ports, and the adjacent side inner walls of the two rectangular cavities are rotatably connected to a second rotating rod 19, and the outer walls of the two second rotating rods 19 are provided with a plurality of blades 20 along their circumference, and the bending directions of the plurality of blades 20 are the same, and a driving motor 17 is installed on the left inner wall of the rectangular cavity on the left side, and the output shaft end of the driving motor 17 is fixedly connected to the second rotating rod 19 on the left side, and the left space of the rectangular cavity on the left side is connected to the outside through an air inlet, and an air outlet is arranged on the right side of the rectangular cavity on the right side, and the air outlet An exhaust pipe 13 is connected to the top, and the outlet end of the exhaust pipe 13 is away from the support frame 7, so that the hot air flow will not accumulate around the bypass switch; a transmission cavity is arranged in the rectangular box 14, and the inner walls on the left and right sides of the transmission cavity are rotatably connected with a first rotating rod 15, and the first rotating rod 15 is connected to the second rotating rod 19 on the left side through a first transmission assembly 16. The right inner wall of the rectangular cavity on the right side is rotatably connected with a third rotating rod 22, and the third rotating rod 22 and the second rotating rod 19 on the right side are provided with mutually meshing gears 21, and the third rotating rod 22 is connected to the first rotating rod 15 through a second transmission assembly 23. A socket 6 is arranged at the upper end of the base 1, and an indicator light 8 is installed at the upper end of the support frame 7. A main power supply is provided, and the main power supply, the socket 6, the indicator light 8 and the converter valve submodule 18 form a loop. During testing, the bypass switch is connected in parallel with the converter valve submodule 18 during testing.

[0026] Among them, the first transmission assembly 16 includes a first transmission wheel arranged on the first rotating rod 15 and the second rotating rod 19 located on the left side, and the two first transmission wheels are connected by a first transmission belt. The second transmission assembly 23 includes a second transmission wheel arranged on the first rotating rod 15 and the third rotating rod 22, and the two second transmission wheels are connected by a second transmission belt.

[0027] Among them, the upper end of the base 1 is provided with a placement groove 2, and a pressure plate 3 is provided in the placement groove 2. The lower end of the pressure plate 3 is elastically connected to the inner bottom of the placement groove 2 through two first springs 5. The lower end of the pressure plate 3 and the inner bottom of the placement groove 2 are both provided with contact pieces 4 that cooperate with each other. An external power supply is provided, and the external power supply, the two contact pieces 4 and the second electromagnet 29 form a loop through wires.

[0028] Among them, a second electromagnet 29 is provided at the inner top of the placement cavity, and two telescopic rods are fixedly connected to the lower end of the second electromagnet 29, and the telescopic ends of the two telescopic rods are commonly fixedly connected to a temperature control box 26, and the temperature control box 26 has magnetism. After the second electromagnet 29 is energized, it repels the adjacent surfaces of the temperature control box 26 with the same charge, and the adjacent surfaces of the temperature control box 26 and the second electromagnet 29 are elastically connected by two second springs 25. A slider 27 is provided in the temperature control box 26, and the right side of the slider 27 and the right inner wall of the temperature control box 26 are fixedly connected with mutually matching conductive blocks 28. The external power supply, the two conductive blocks 28 and the drive motor 17 form a loop through wires, and the left space of the temperature control box 26 is filled with a low boiling point solution, which is a dichloromethane solution with a boiling point of 39.75°C. A thermal conductive sheet is provided at the inner bottom of the temperature control box 26, and the lower end of the thermal conductive sheet extends to the outside.

[0029] Among them, a moving cavity is provided in the support frame 7, and a first electromagnet 24 is slidably connected in the moving cavity. The first electromagnet 24 is elastically connected to the inner bottom of the moving cavity through a third spring. The first electromagnet 24 and the inner top of the moving cavity are jointly fixedly connected with a folding airbag 30. A water tank 9 is provided at the upper end of the support frame 7. The folding airbag 30 is connected to the right space of the water tank 9 through a water outlet pipe 12. The upper end of the folding airbag 30 is connected with a three-way pipe. The inner top of the support frame 7 is fixedly connected to two vertical plates 10, and the two vertical plates 10 are provided The serpentine tube 11, the liquid inlet ends of the two serpentine tubes 11 are connected to the bottom space of the water tank 9, the liquid outlet ends of the two serpentine tubes 11 are connected to the three-way pipe, and the three-way pipe and the outlet pipe 12 are both provided with a one-way valve. The water in the two serpentine tubes 11 enters the folding airbag 30 in one direction through the three-way pipe, and the water in the folding airbag 30 enters the water tank 9 in one direction through the outlet pipe 12. Two conductive sheets are provided on the left and right sides of the moving cavity, and an external power supply, two conductive blocks 28, two conductive sheets and the first electromagnet 24 form a loop through wires.

[0030] The present invention can explain its functional principle through the following operation mode: when testing, after placing the bypass switch in the placement slot 2, the plug of the bypass switch is inserted into the socket 6, so that the current passes through the converter valve submodule 18 and the bypass switch, and the converter valve submodule 18 and the bypass switch should be connected in parallel in the loop;

[0031] When the bypass switch is in the off state, the current will only pass through the converter valve submodule 18 and then through the indicator light 8. At this time, the entire circuit is equal to a series loop, so the current passing through the indicator light 8 is small, and the indicator light 8 is dim. When the bypass switch is in the on state, the converter valve submodule 18 will be short-circuited, so that the current passing through the indicator light 8 increases, and the indicator light 8 is brighter.

[0032] When the bypass switch is in the disconnected state, the test can be carried out after closing the bypass switch. When the bypass switch is in the closed state, the test can be carried out directly.

[0033] When the bypass switch is placed in the placement slot 2, the pressure plate 3 will move downward, and the two contact pieces 4 will contact, so that the second electromagnet 29 will be energized. After the second electromagnet 29 is energized, a repulsive force will be generated on the temperature control box 26, so that the temperature control box 26 will move downward so that the thermal conductive piece will contact the converter valve submodule 18. When testing, since the converter valve submodule 18 is in a short-circuit state, the converter valve submodule 18 generates a large amount of heat, and the heat is introduced into the low-boiling point solution through the thermal conductive piece. After the low-boiling point solution is vaporized, the slider 27 moves right, and the two conductive blocks 28 contact, so that the drive motor 17 is energized to run;

[0034] When not being detected, the converter valve submodule 18 is also in working state, but the thermal conductive sheet is not in contact with the converter valve submodule 18, so that when the converter valve submodule 18 is not being detected, the heat generated by the power-on state will not vaporize the low-boiling point solution. When being detected, the thermal conductive sheet can be in contact with the converter valve submodule 18, so that the temperature rise after the short circuit can be triggered more quickly;

[0035] After the driving motor 17 is powered on, it will drive the second rotating rod 19 on the left to rotate, thereby driving the third rotating rod 22 to rotate through the first transmission component 16 and the second transmission component 23. The rotation of the third rotating rod 22 drives the second rotating rod 19 on the right to rotate. Through the setting of the two gears 21, the two second rotating rods 19 rotate in opposite directions, so that the external gas enters the placement chamber through the one-way air inlet on the left, and the multiple fan blades 20 on the right rotate to discharge the airflow in the placement chamber to the outside through the exhaust pipe 13, thereby accelerating the gas flow in the placement chamber, thereby avoiding the situation where the temperature after the circuit of the converter valve submodule 18 is too high and causes the converter valve submodule 18 to burn out;

[0036] At the same time, when the two conductive blocks 28 are in contact, the first electromagnet 24 is in contact with the two conductive sheets, so that the first electromagnet 24 is energized. After the first electromagnet 24 is energized, the second electromagnet 29 will generate an attractive force on the first electromagnet 24, so that the first electromagnet 24 moves downward. When the first electromagnet 24 is separated from the two conductive sheets, the first electromagnet 24 will continue to move downward for a distance and then move back due to inertia. When the first electromagnet 24 contacts the two conductive sheets again, magnetism will be generated again, so as to repeat the above process.

[0037] The up and down movement of the first electromagnet 24 will cause the folding airbag 30 to continuously stretch and contract. The stretching of the folding airbag 30 will draw the water in the two serpentine tubes 11 into the folding airbag 30. When the folding airbag 30 contracts, the water will be discharged back into the water tank 9, thereby lowering the temperature of the gas between the two vertical plates 10 and keeping the gas entering the placement cavity in a low temperature state at all times, thereby improving the heat dissipation effect on the converter valve submodule 18.

[0038] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flexible direct current converter valve bypass switch test device, comprising a base (1), characterized in that: The upper end of the base (1) is fixedly connected to a support frame (7), and the lower end of the support frame (7) is fixedly connected to a rectangular box (14), wherein a placement cavity is provided in the rectangular box (14), and a flow control valve submodule (18) is placed in the placement cavity, wherein two rectangular cavities are provided in the rectangular box (14), and the adjacent side spaces of the two rectangular cavities are connected to the placement cavity through two connecting ports, and the adjacent side inner walls of the two rectangular cavities are rotatably connected to a second rotating rod (19), and the outer walls of the two second rotating rods (19) are provided with a plurality of fan blades (20) along their circumferences, and a driving motor (17) is installed on the left inner wall of the rectangular cavity on the left side, and the output shaft end of the driving motor (17) is fixedly connected to the second rotating rod (19) on the left side, and the left side space of the rectangular cavity on the left side is connected to the outside through an air inlet, and an air outlet is provided on the right side of the rectangular cavity on the right side, and an exhaust pipe (13) is connected to the air outlet; A transmission cavity is provided in the rectangular box (14), and the inner walls on the left and right sides of the transmission cavity are rotatably connected to a first rotating rod (15), and the first rotating rod (15) is transmission-connected to a second rotating rod (19) located on the left side through a first transmission assembly (16); a third rotating rod (22) is rotationally connected to the right inner wall of the rectangular cavity located on the right side, and the third rotating rod (22) and the second rotating rod (19) located on the right side are both provided with gears (21) that mesh with each other, and the third rotating rod (22) is transmission-connected to the first rotating rod (15) through a second transmission assembly (23); The upper end of the base (1) is provided with a placement groove (2), a pressure plate (3) is provided in the placement groove (2), the lower end of the pressure plate (3) is elastically connected to the inner bottom of the placement groove (2) via two first springs (5), and the lower end of the pressure plate (3) and the inner bottom of the placement groove (2) are both provided with contact pieces (4) that cooperate with each other; A second electromagnet (29) is provided at the inner top of the placement cavity, the lower end of the second electromagnet (29) is fixedly connected to two telescopic rods, the telescopic ends of the two telescopic rods are commonly fixedly connected to a temperature control box (26), and the adjacent surfaces of the temperature control box (26) and the second electromagnet (29) are elastically connected via two second springs (25); The temperature control box (26) is provided with a slider (27), the right side of the slider (27) and the right inner wall of the temperature control box (26) are fixedly connected with mutually matching conductive blocks (28), the left side space of the temperature control box (26) is filled with a low boiling point solution, and the inner bottom of the temperature control box (26) is provided with a thermal conductive sheet, the lower end of which extends to the outside; The support frame (7) is provided with a moving chamber, in which a first electromagnet (24) is slidably connected, the first electromagnet (24) is elastically connected to the inner bottom of the moving chamber via a third spring, the first electromagnet (24) and the inner top of the moving chamber are jointly fixedly connected with a folding airbag (30), the upper end of the support frame (7) is provided with a water tank (9), the folding airbag (30) is connected to the right side space of the water tank (9) via a water outlet pipe (12), the upper end of the folding airbag (30) is connected with a three-way pipe, the inner top of the support frame (7) is fixedly connected with two vertical plates (10), the two vertical plates (10) are each provided with a serpentine pipe (11), the liquid inlet ends of the two serpentine pipes (11) are connected to the bottom space of the water tank (9), the liquid outlet ends of the two serpentine pipes (11) are connected to the three-way pipe, the three-way pipe and the water outlet pipe (12) are both provided with a one-way valve, and two conductive sheets are provided on the left and right sides of the moving chamber; When the bypass switch is placed in the placement slot (2), the pressure plate (3) moves downward, the two contact pieces (4) come into contact, and the second electromagnet (29) is energized. After the second electromagnet (29) is energized, a repulsive force is generated on the temperature control box (26), thereby causing the temperature control box (26) to move downward so that the thermal conductive piece comes into contact with the converter valve submodule (18). During the test, since the converter valve submodule (18) is in a short-circuit state, the converter valve submodule (18) generates a large amount of heat, which is introduced into the low-boiling-point solution through the thermal conductive piece. After the low-boiling-point solution is vaporized, the slider (27) moves rightward, and the two conductive blocks (28) come into contact, so that the drive motor (17) is energized to operate; At the same time, when the two conductive blocks (28) are in contact, the first electromagnet (24) is in contact with the two conductive sheets, so that the first electromagnet (24) is energized. After the first electromagnet (24) is energized, the second electromagnet (29) generates an attractive force on the first electromagnet (24), so that the first electromagnet (24) moves downward. When the first electromagnet (24) is separated from the two conductive sheets, the first electromagnet (24) continues to move downward for a distance and then moves back due to inertia. When the first electromagnet (24) contacts the two conductive sheets again, magnetism is generated again, so that the above process is repeated.

2. A bypass switch test device for a flexible direct current converter valve according to claim 1, characterized in that: The first transmission assembly (16) comprises a first transmission wheel arranged on a first rotating rod (15) and a second rotating rod (19) located on the left side, and the two first transmission wheels are connected by a first transmission belt. The second transmission assembly (23) comprises a second transmission wheel arranged on the first rotating rod (15) and a third rotating rod (22), and the two second transmission wheels are connected by a second transmission belt.

3. A bypass switch test device for a flexible direct current converter valve according to claim 1, characterized in that: The upper end of the base (1) is provided with a plug hole (6), and the upper end of the support frame (7) is provided with an indicator light (8).

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