A field detection device and method for flexible DC transmission converter valve submodule

Abstract

The present invention discloses a field detection device and method for a flexible direct current transmission converter valve submodule, which mainly includes a detection box, wherein two first partitions are fixedly connected to the bottom surface of the detection box, the two first partitions are T-shaped, and three placement areas are formed between the two, and through grooves are provided on both sides of the bottom end of the outer surface of the first partition. The advantages of the present invention are: a control processing component, a capacitance and inductance detector and a voltage monitor are respectively arranged at the bottom end of the detection box, and at the same time, a placement box is arranged at the top of the detection box, wherein a sponge layer is arranged inside the placement box, and a handheld display component is arranged inside the sponge layer. When in use, the capacitance and inductance detector and the voltage monitor are respectively connected to the corresponding submodules through cables, and the changes of parameters such as voltage and capacitance are displayed on the handheld display component, which is convenient for technicians to judge the working status of the module and convenient for users to actually use, and has high practicality.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission devices, and in particular to an on-site detection device and method for a flexible direct current transmission converter valve submodule. Background Art

[0002] Unlike traditional DC transmission systems, the converter valve in a modular multi-level flexible DC transmission system is the core equipment of the DC transmission system. It connects the three-phase AC voltage to the DC end in sequence to obtain the desired DC voltage and realize power control. Its value accounts for about 22% to 25% of the total price of the converter station equipment.

[0003] The smallest unit of the converter valve is the submodule that makes up the converter valve. The number of submodules in a high-voltage, large-capacity flexible DC converter station is large, and changes with the capacity of the converter station. When the capacity of the converter station based on modular multi-level flexible DC transmission technology reaches 1000MW, the number of submodules usually reaches several thousand. The submodule mainly includes bypass switches, energy sources, IGBTs and drive devices, protection thyristors and other equipment. In the current flexible DC transmission actual projects, submodules are prone to failure, and technicians need to use corresponding detection equipment for detection and maintenance. However, there are many detection and maintenance tools currently used, and in actual use, they also have the following disadvantages:

[0004] It is inconvenient for technicians to carry tools, and the detection device is independent, which is inconvenient for users to use, affecting the work efficiency of detection and maintenance. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of the prior art, the present invention provides an on-site detection device for a flexible DC transmission converter valve submodule, which has the advantages of integrating multiple detection devices, being easy to use, and being provided with an independent tool storage component, so that multiple tools can be clearly classified for easy access; at the same time, the entire device is easy for users to move and carry, and has the advantages of high practicality, etc., which solves the problem that it is inconvenient for technicians to carry tools, and that the detection devices are independent and inconvenient for users to use, thus affecting the work efficiency of detection and maintenance.

[0007] (II) Technical solution

[0008] In order to achieve the above-mentioned purpose of integrating multiple detection devices, facilitating use, and providing an independent tool storage component, clearly classifying multiple tools for easy access, and at the same time, the entire device is convenient for users to move and carry, and has high practicality, the present invention provides the following technical solutions: A field detection device for a flexible DC transmission converter valve submodule, comprising a detection box;

[0009] Two first partition plates are fixedly connected to the bottom surface of the interior of the detection box, the two first partition plates are T-shaped, and three placement areas are formed between each other, through grooves are provided on both sides of the bottom end of the outer surface of the first partition plate, and the through grooves connect the three placement areas, first sockets are provided on the bottom of one end of both sides of the outer surface of the detection box, second sockets are provided on both sides of the bottom of the back side of the detection box, two ventilation holes are provided on the bottom of both sides of the outer surface of the detection box close to the first sockets, a draw rod box is fixedly connected to the middle part of the back side of the detection box, and fixed seats are fixedly connected to both ends of the detection box close to the top surface of the draw rod box, and a collection box and a placement box are sequentially arranged inside the detection box from bottom to top;

[0010] A control processing component, a capacitance and inductance detector and a voltage monitor are arranged at the bottom of the detection box. The control processing component, the capacitance and inductance detector and the voltage monitor are respectively located in three placement areas. The positions of the capacitance and inductance detector and the voltage monitor correspond to the positions of the first socket. The capacitance and inductance detector and the voltage monitor are electrically connected to the control processing component through wires.

[0011] Two second partition plates are fixedly connected to the bottom surface of the collection box, the two second partition plates are in a cross shape, and form four placement areas with the collection box, the tops of the inner walls of the two second partition plates are provided with placement grooves, there are four placement grooves, and the insides of the four placement grooves are provided with sealing plates, the middle parts of the top ends of the outer surfaces of the four sealing plates are concave to form grooves, the four corners of the four sealing plates away from the bottom ends of the outer surfaces of the grooves are provided with first installation grooves, the insides of the four first installation grooves are fixedly connected with magnets, and the tops of the two sides of the outer surface of the collection box are provided with handle grooves;

[0012] A sponge layer is provided inside the placement box, and the sponge layer is provided around the inner wall of the placement box. A handheld display component is provided inside the sponge layer, and the handheld display component is electrically connected to the control processing component through a wire. The middle of both sides of the top surface of the placement box are fixedly connected with handles. The collection box is located above the first partition plate, and the placement box is located above the collection box;

[0013] The interior of the draw rod box is slidably connected with a draw rod;

[0014] The interior of the fixing seat is rotatably connected with a top cover;

[0015] The front ends of the four vents are all clamped with filter plates.

[0016] Preferably, wheels are fixedly connected to the four corners of the bottom end of the outer surface of the detection box, the four wheels are all lockable, and the four wheels are fixedly connected to the detection box by bolts.

[0017] Preferably, the heights of the control processing component, the capacitance and inductance detector and the voltage monitor are all smaller than the height of the first partition plate, and the wires electrically connecting the capacitance and inductance detector and the voltage monitor to the control processing component pass through the through slot.

[0018] Preferably, the thickness of the four sealing plates is not greater than the height of the inner wall of the placement groove, and the dimensions of the four sealing plates are matched with the dimensions of the inner wall of the placement groove.

[0019] Preferably, the sponge layer is bonded to the inner wall of the placement box by adhesive, the thickness of the sponge layer is not less than the wall thickness of the placement box, and the shape of the interior of the sponge layer is compatible with the shape of the handheld display component.

[0020] Preferably, the outer surfaces of the four filter plates are flush with one side of the outer surface of the detection box, and the four filter plates are bonded to the inner wall of the vent hole by adhesive.

[0021] Preferably, the size of the top cover matches the size of the detection box, and the bottom surface of the top cover fits the top surface of the detection box.

[0022] Preferably, the two handle grooves are connected to the interior of the collection box, the depths of the two grooves are less than the thickness of the sealing plate, and the two handles are fixedly connected to the placement box by welding.

[0023] Preferably, outer surfaces of the capacitance and inductance detector and the voltage monitor are both provided with magnetic interfaces, and the magnetic interfaces are electrically connected to the capacitance and inductance detector and the voltage monitor.

[0024] A method for using an on-site detection device for a flexible direct current transmission converter valve submodule comprises the following steps:

[0025] 1) Use cables to electrically connect the voltage detector, capacitance and inductance detector, and handheld display component to the control processing component in sequence;

[0026] 2) Electrically connect the test device such as the electric pen used for measurement to the magnetic suction interface on the outer surface of the voltage detector and the capacitance and inductance detector respectively;

[0027] 3) After the voltage detector and the capacitance and inductance detector are measured, the control processing unit integrates the measurement information and displays it on the handheld display unit.

[0028] (III) Beneficial effects

[0029] Compared with the prior art, the present invention provides an on-site detection device and method for a flexible DC transmission converter valve submodule, which has the following beneficial effects:

[0030] 1. The on-site detection device of the flexible DC transmission converter valve submodule is provided with a control processing component, a capacitor and inductance detector and a voltage monitor at the bottom of the detection box. At the same time, a placement box is provided at the top of the detection box, wherein a sponge layer is provided inside the placement box, and a handheld display component is provided inside the sponge layer. When in use, the capacitor and inductance detector and the voltage monitor are respectively connected to the corresponding submodules through cables, and the changes of parameters such as voltage and capacitance are integrated by the control processing component and displayed on the handheld display component, so that the technicians can judge the working status of the module according to the relevant parameters. The integrity of the whole device is good, which is convenient for users to use in practice, and there is no need to carry multiple detection devices, so it is practical.

[0031] 2. The on-site detection device of the flexible DC transmission converter valve submodule is provided with a collection box at the middle end inside the detection box, wherein a placement groove is provided at the top inside the collection box, a sealing plate is provided inside the placement groove, and magnets are provided at the four corners of the bottom surface of the sealing plate, thereby realizing a magnetic connection between the sealing plate and the collection box, which is convenient for users to open and close and can play the role of closing the collection box. At the same time, wheels are fixedly connected to the four corners of the bottom surface of the detection box, which is convenient for users to move the entire device and make the entire device easy for users to carry. To a certain extent, the structure of the entire device is more in line with actual usage habits and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic structural diagram of an on-site detection device for a flexible DC transmission converter valve submodule proposed by the present invention;

[0033] Figure 2 A schematic diagram of the internal structure of an on-site detection device for a flexible DC transmission converter valve submodule proposed by the present invention;

[0034] Figure 3 A schematic diagram of the explosion structure of an on-site detection device for a flexible DC transmission converter valve submodule proposed by the present invention;

[0035] Figure 4 This is a structural schematic diagram of a detection box for an on-site detection device of a flexible DC transmission converter valve submodule proposed by the present invention;

[0036] Figure 5 This is a schematic diagram of the internal structure of a detection box of an on-site detection device for a flexible DC transmission converter valve submodule proposed by the present invention;

[0037] Figure 6 This is a schematic diagram of the structure of a collection box of an on-site detection device for a flexible DC transmission converter valve submodule proposed by the present invention;

[0038] Figure 7This is a schematic diagram of the structure of a placement box for an on-site detection device of a flexible DC transmission converter valve submodule proposed by the present invention;

[0039] Figure 8 A schematic diagram of the top view of the sealing plate of an on-site detection device for a flexible DC transmission converter valve submodule proposed by the present invention;

[0040] Fig. 9 This is a schematic diagram of the bottom-up structure of a sealing plate of an on-site detection device for a flexible DC power transmission converter valve submodule proposed by the present invention;

[0041] Fig.10 A schematic diagram of the control flow of an on-site detection device for a flexible DC transmission converter valve submodule proposed in the present invention.

[0042] In the figure: 1-test box, 2-top cover, 3-pumping rod, 4-filter plate, 5-wheel, 6-first socket, 7-collection box, 8-sealing plate, 9-placement box, 10-handheld display component, 11-first partition plate, 12-through slot, 13-second socket, 14-fixed seat, 15-voltage monitor, 16-capacitance and inductance detector, 17-control processing component, 18-second partition plate, 19-placement slot, 20-handle slot, 21-sponge layer, 22-handle, 23-groove, 24-first installation slot, 25-magnet, 26-pumping rod box, 27-vent, 28-magnetic suction interface. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figure 1-9 , a field detection device for a flexible DC transmission converter valve submodule, comprising a detection box 1;

[0045] Two first partition plates 11 are fixedly connected to the bottom surface inside the detection box 1. The two first partition plates 11 are T-shaped, and three placement areas are formed between them. Through grooves 12 are provided on both sides of the bottom end of the outer surface of the first partition plates 11, and the through grooves 12 connect the three placement areas. First sockets 6 are provided at the bottom of one end of both sides of the outer surface of the detection box 1, and second sockets 13 are provided on both sides of the bottom of the back of the detection box 1. Two ventilation holes 27 are provided at the bottom of both sides of the outer surface of the detection box 1 near the first socket 6. A draw rod box 26 is fixedly connected to the middle of the back of the detection box 1, and fixed seats 14 are fixedly connected to both ends of the detection box 1 near the top surface of the draw rod box 26. The interior of the detection box 1 is provided with a collection box 7 and a placement box 9 from bottom to top;

[0046] A control processing component 17, a capacitance and inductance detector 16 and a voltage monitor 15 are arranged at the bottom of the detection box 1. The control processing component 17, the capacitance and inductance detector 16 and the voltage monitor 15 are respectively located in three placement areas. The positions of the capacitance and inductance detector 16 and the voltage monitor 15 correspond to the positions of the first socket 6. The capacitance and inductance detector 16 and the voltage monitor 15 are electrically connected to the control processing component 17 through wires.

[0047] Two second partition plates 18 are fixedly connected to the bottom surface of the collection box 7. The two second partition plates 18 are in a cross shape and form four placement areas with the collection box 7. The tops of the inner walls of the two second partition plates 18 are provided with placement grooves 19. There are four placement grooves 19. The four placement grooves 19 are provided with sealing plates 8 inside. The middle parts of the top ends of the outer surfaces of the four sealing plates 8 are concave to form grooves 23. The four corners of the bottom ends of the outer surfaces of the four sealing plates 8 away from the grooves 23 are provided with first mounting grooves 24. Magnets 25 are fixedly connected to the insides of the four first mounting grooves 24. Handle grooves 20 are provided on the tops of the two sides of the outer surface of the collection box 7.

[0048] A sponge layer 21 is provided inside the placement box 9, and the sponge layer 21 is provided around the inner wall of the placement box 9. A handheld display component 10 is provided inside the sponge layer 21, and the handheld display component 10 is electrically connected to the control processing component 17 through a wire. The middle of both sides of the top surface of the placement box 9 are fixedly connected with handles 22. The collection box 7 is located above the first partition plate 11, and the placement box 9 is located above the collection box 7;

[0049] The draw rod box 26 is slidably connected with the draw rod 3;

[0050] The top cover 2 is rotatably connected inside the fixing seat 14;

[0051] The front ends of the four ventilation holes 27 are all clamped with filter plates 4 .

[0052] As an optional technical solution of the present invention:

[0053] Wheels 5 are fixedly connected to the four corners of the bottom end of the outer surface of the detection box 1, and the four wheels 5 are all lockable. The four wheels 5 are fixedly connected to the detection box 1 by bolts. The use of the four wheels 5 makes it convenient for the user to move the entire device, making the entire device convenient for the user to carry. To a certain extent, the structure of the entire device is more in line with actual usage habits and is easy to use. At the same time, the wheels 5 connected by bolts can be easily installed and disassembled, making it convenient for the user to replace the wheels 5 that are more severely worn.

[0054] As an optional technical solution of the present invention:

[0055] The heights of the control processing component 17, the capacitance and inductance detector 16, and the voltage monitor 15 are all less than the height of the first partition plate 11. The wires electrically connecting the capacitance and inductance detector 16 and the voltage monitor 15 to the control processing component 17 pass through the through groove 12, so that a complete circuit path can be formed between the components, which is convenient for users to use. The internal structure of the entire device is convenient for users to arrange and wire, avoiding the situation where multiple lines are unclearly distributed.

[0056] As an optional technical solution of the present invention:

[0057] The thickness of the four sealing plates 8 is not greater than the height of the inner wall of the placement groove 19, and the dimensions of the four sealing plates 8 are adapted to the dimensions of the inner wall of the placement groove 19. The use of the four sealing plates 8 can play the role of sealing the collection box 7, and the magnetically connected sealing plates 8 can achieve the purpose of being easy for users to open and close, preventing the positions of the components of the entire device from being confused during the movement, making it easier for users to take them out later.

[0058] As an optional technical solution of the present invention:

[0059] The sponge layer 21 is bonded to the inner wall of the placement box 9 by glue. The thickness of the sponge layer 21 is not less than the wall thickness of the placement box 9. The shape of the inside of the sponge layer 21 is adapted to the shape of the handheld display component 10. The setting of the sponge layer 21 can reduce the collision between the handheld display component 10 and the inner wall of the placement box 9, thereby protecting the handheld display component 10. The bonded sponge layer 21 can achieve the purpose of being easy for users to replace.

[0060] As an optional technical solution of the present invention:

[0061] The outer surfaces of the four filter plates 4 are flush with one side of the outer surface of the detection box 1. The four filter plates 4 are bonded to the inner wall of the vent 27 by adhesive. The positions of the four vents 27 correspond to the positions of the control processing component 17, the capacitance and inductance detector 16 and the voltage monitor 15, respectively, and can play a role in heat dissipation. The use of the filter plates 4 can prevent impurities from entering the interior of the detection box 1, and the bonded filter plates 4 can achieve the purpose of being easy for users to disassemble and replace.

[0062] As an optional technical solution of the present invention:

[0063] The size of the top cover 2 is adapted to the size of the test box 1, and the bottom surface of the top cover 2 fits with the top surface of the test box 1. The use of the top cover 2 can play the role of closing the test box 1. In actual use, a lock can be set between the top cover 2 and the test box 1 to improve the safety of the entire device, which is also in line with actual usage habits.

[0064] As an optional technical solution of the present invention:

[0065] The two handle grooves 20 are connected to the interior of the collection box 7, the depths of the two grooves 23 are less than the thickness of the sealing plate 8, and the two handles 22 are fixedly connected to the placement box 9 by welding. The arrangement of the handle grooves 20, the grooves 23 and the handles 22 conforms to the user's usage habits and facilitates the removal of the placement box 9, the sealing plate 8 and the collection box 7. At the same time, it also makes the design of the entire device more ergonomic.

[0066] As an optional technical solution of the present invention:

[0067] The outer surfaces of the capacitance and inductance detector 16 and the voltage monitor 15 are both provided with a magnetic suction interface 28, and the magnetic suction interface 28 is electrically connected to the capacitance and inductance detector 16 and the voltage monitor 15. The magnetic suction interface 28 provided on the outer surfaces of the capacitance and inductance detector 16 and the voltage monitor 15 facilitates the user to connect the external device to the two respectively, and is easy to remove and unload, has high practicality, and is convenient for users to use.

[0068] See also Fig.10 A method for using a field detection device for a flexible DC transmission converter valve submodule comprises the following steps:

[0069] 1) Use cables to electrically connect the voltage detector 15, the capacitance and inductance detector 16, and the handheld display component 10 to the control processing component 17 in sequence;

[0070] 2) Electrically connect the detection device such as an electric pen used for measurement to the magnetic suction interface 28 on the outer surface of the voltage detector 15 and the capacitance and inductance detector 16 respectively;

[0071] 3) After the voltage detector 15 and the capacitance and inductance detector 16 have been measured, the control processing unit 17 integrates the measurement information and displays it on the handheld display unit 10 .

[0072] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0073] When in use, open the top cover, take out the placement box and the collection box in turn, remove the sealing plate 8 in the collection box, take out the cables to be used, and at the same time, use cables to connect the capacitance and inductance detector and the voltage monitor to the corresponding sub-modules, and use cables to connect the handheld display component to the control processing component. The changes in parameters such as voltage and capacitance of the sub-module to be detected are integrated by the control processing component and displayed on the handheld display component, so that technicians can judge the working status of the module according to relevant parameters. Maintenance tools are also placed in other positions inside the collection box to facilitate users to perform maintenance. The entire device is movable, and the user can pull the entire device through the pull rod, making it more practical and easy to use.

[0074] In summary, the on-site detection device of the flexible DC transmission converter valve submodule is provided with a control processing component 17, a capacitance and inductance detector 16 and a voltage monitor 15 at the bottom of the detection box 1. At the same time, a placement box 9 is provided at the top of the detection box 1, wherein a sponge layer 21 is provided inside the placement box 9, and a handheld display component 10 is provided inside the sponge layer 21. When in use, the capacitance and inductance detector 16 and the voltage monitor 15 are connected to the corresponding submodules through cables, and the changes of the parameters such as voltage and capacitance are integrated by the control processing component 17 and displayed on the handheld display component 10, so that the technicians can judge the working condition of the module according to the relevant parameters. The device has good integrity, is convenient for users to use in practice, and does not need to carry multiple detection devices. It is highly practical. A collection box 7 is provided at the middle end of the detection box 1, wherein a placement groove 19 is provided at the top of the collection box 7, and a sealing plate 8 is provided inside the placement groove 19. Magnets 25 are provided at the four corners of the bottom of the sealing plate 8, thereby realizing a magnetic connection between the sealing plate 8 and the collection box 7, which is convenient for users to open and close, and can play the role of closing the collection box 7. At the same time, wheels 5 are fixedly connected at the four corners of the bottom of the detection box 1, which is convenient for users to move the entire device and make the entire device easy for users to carry. To a certain extent, the structure of the entire device is more in line with actual usage habits and is easy to use.

[0075] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise one" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0076] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A field detection device for a flexible DC transmission converter valve submodule, characterized in that: It comprises a detection box (1); Two first partition plates (11) are fixedly connected to the bottom surface of the interior of the detection box (1), the two first partition plates (11) are T-shaped, and three placement areas are formed between each other, through grooves (12) are provided on both sides of the bottom end of the outer surface of the first partition plates (11), and the through grooves (12) connect the three placement areas, a first socket (6) is provided at the bottom of one end of both sides of the outer surface of the detection box (1), a second socket (13) is provided on both sides of the bottom of the back side of the detection box (1), two ventilation holes (27) are provided at the bottom of both sides of the outer surface of the detection box (1) near the first socket (6), a pull-out rod box (26) is fixedly connected to the middle of the back side of the detection box (1), and fixed seats (14) are fixedly connected to both ends of the detection box (1) near the top side of the pull-out rod box (26), and a collection box (7) and a placement box (9) are arranged in sequence from bottom to top inside the detection box (1); A control processing component (17), a capacitance and inductance detector (16) and a voltage monitor (15) are arranged at the bottom of the detection box (1); the control processing component (17), the capacitance and inductance detector (16) and the voltage monitor (15) are respectively located in three placement areas; the positions of the capacitance and inductance detector (16) and the voltage monitor (15) correspond to the positions of the first socket (6); and the capacitance and inductance detector (16) and the voltage monitor (15) are electrically connected to the control processing component (17) through wires; Two second partition plates (18) are fixedly connected to the bottom surface of the collection box (7), the two second partition plates (18) are in a cross shape, and form four placement areas with the collection box (7), the tops of the inner walls of the two second partition plates (18) are provided with placement grooves (19), there are four placement grooves (19), the insides of the four placement grooves (19) are provided with sealing plates (8), the middle parts of the top ends of the outer surfaces of the four sealing plates (8) are concave to form grooves (23), the four corners of the outer surfaces of the four sealing plates (8) away from the bottom ends of the grooves (23) are provided with first installation grooves (24), the insides of the four first installation grooves (24) are fixedly connected with magnets (25), and the tops of the outer surfaces of the collection box (7) on both sides are provided with handle grooves (20); A sponge layer (21) is provided inside the placement box (9), and the sponge layer (21) is arranged around the inner wall of the placement box (9). A handheld display component (10) is provided inside the sponge layer (21), and the handheld display component (10) is electrically connected to the control processing component (17) through a wire. The middle of both sides of the top surface of the placement box (9) are fixedly connected with handles (22). The collection box (7) is located above the first partition plate (11), and the placement box (9) is located above the collection box (7); The draw rod box (26) is slidably connected with a draw rod (3) inside; The interior of the fixing seat (14) is rotatably connected to a top cover (2); The front ends of the four ventilation holes (27) are all clamped with filter plates (4).

2. The on-site detection device for a flexible DC transmission converter valve submodule according to claim 1 is characterized in that: Wheels (5) are fixedly connected to the four corners of the bottom end of the outer surface of the detection box (1); the four wheels (5) are all lockable, and the four wheels (5) are fixedly connected to the detection box (1) by bolts.

3. The on-site detection device for a flexible DC transmission converter valve submodule according to claim 1, characterized in that: The heights of the control processing component (17), the capacitance and inductance detector (16) and the voltage monitor (15) are all less than the height of the first partition plate (11), and the wires electrically connecting the capacitance and inductance detector (16) and the voltage monitor (15) to the control processing component (17) pass through the through slot (12).

4. The on-site detection device for a flexible DC transmission converter valve submodule according to claim 1, characterized in that: The thickness of the four sealing plates (8) is no greater than the height of the inner wall of the placement groove (19), and the dimensions of the four sealing plates (8) are compatible with the dimensions of the inner wall of the placement groove (19).

5. The on-site detection device for a flexible DC transmission converter valve submodule according to claim 1, characterized in that: The sponge layer (21) is bonded to the inner wall of the placement box (9) by means of adhesive, the thickness of the sponge layer (21) is not less than the wall thickness of the placement box (9), and the shape of the interior of the sponge layer (21) is compatible with the shape of the handheld display component (10).

6. The on-site detection device for a flexible DC transmission converter valve submodule according to claim 1, characterized in that: The outer surfaces of the four filter plates (4) are flush with one side of the outer surface of the detection box (1), and the four filter plates (4) are bonded to the inner wall of the vent hole (27) by adhesive.

7. The on-site detection device for a flexible DC transmission converter valve submodule according to claim 1, characterized in that: The size of the top cover (2) is matched to the size of the detection box (1), and the bottom surface of the top cover (2) is in contact with the top surface of the detection box (1).

8. The on-site detection device for a flexible DC transmission converter valve submodule according to claim 1, characterized in that: The two handle grooves (20) are connected to the interior of the collection box (7), the depths of the two grooves (23) are both less than the thickness of the sealing plate (8), and the two handles (22) are fixedly connected to the placement box (9) by welding.

9. The on-site detection device for a flexible DC transmission converter valve submodule according to claim 1, characterized in that: The outer surfaces of the capacitance and inductance detector (16) and the voltage monitor (15) are both provided with a magnetic suction interface (28), and the magnetic suction interface (28) is electrically connected to the capacitance and inductance detector (16) and the voltage monitor (15).

10. A method for on-site detection of a flexible DC transmission converter valve submodule, characterized in that: The on-site detection device for the flexible DC transmission converter valve submodule according to any one of claims 1 to 9 comprises the following steps: 1) Using cables to electrically connect the voltage monitor (15), the capacitance and inductance detector (16), and the handheld display component (10) to the control processing component (17) in sequence; 2) Electrically connecting a detection device such as an electric pen used for measurement to the magnetic suction interface (28) on the outer surface of the voltage monitor (15) and the capacitance and inductance detector (16); 3) After the voltage monitor (15) and the capacitance and inductance detector (16) measure, the control processing unit (17) integrates the measurement information and displays it on the handheld display unit (10).

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