Short-circuit discharge device for converter valve capacitor and converter valve

Abstract

The invention provides a converter valve capacitor short-circuit discharge device and converter valve, the converter valve capacitor short-circuit discharge device comprises a mounting mechanism, a longitudinal guide mechanism and a short-circuit discharge mechanism, the short-circuit discharge mechanism comprises a moving contact insulating rod, a static contact insulating rod, a contact piece unit and a short-circuit unit, each contact piece unit comprises a discharge resistor and two static contact pieces, each short-circuit unit comprises a conducting strip and an insulating strip which are connected to the movable contact insulating rod, and the first ends of the two static contact pieces in each contact piece unit are connected with the positive electrode and the negative electrode of the capacitor respectively. The rotating arm is driven to rotate by operating the operating mechanism of the converter valve, the movable contact insulating rod is driven by the transmission rod to slide back and forth along the longitudinal guide mechanism, and disconnection or short-circuit discharge between the positive electrode and the negative electrode of the capacitor is completed through disconnection or short-circuit of the static contact piece and the conductive piece, so that the operation is convenient; and a plurality of short-circuit discharge mechanisms can be driven at one time to realize discharge of the multilayer capacitor, so that the efficiency is greatly improved, and the device adapts to large workload of capacitor discharge.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible direct current transmission, and in particular to a short-circuit discharge device for a converter valve capacitor and a converter valve. Background Art

[0002] In recent years, due to the advantages of flexible direct current transmission technology such as independent adjustment of active and reactive power, it can transmit power to the non-interconnected network, overcoming the essential defects of traditional high-voltage direct current transmission, extending the advantages of high-voltage direct current transmission to the distribution network, and greatly broadening the application scope of high-voltage direct current transmission. my country is rich in natural resources, so flexible direct current technology has been widely used.

[0003] The converter valve tower is a core component of voltage source converter (VSC) HVDC transmission technology, making its operation and maintenance safety paramount. As voltage continues to rise, the voltage of each subunit of the converter valve also gradually increases. During a power outage for maintenance, it's impossible to determine whether the capacitors in each subunit have fully discharged, and there's no effective way to fully discharge the DC capacitors of all subunits in the valve tower at once. Therefore, accessing the tower for maintenance without fully discharging the DC capacitors presents a significant safety risk.

[0004] A better method now is to design a small discharge rod and connect the discharge resistor in series in the positive and negative polar circuits. In this way, after the personnel go up the tower, they must first discharge the electricity of each sub-unit capacitor before carrying out inspection and maintenance. However, there are two problems with this. The first is the issue of convenience. A single discharge device is large in size and cumbersome to operate. It is a lot of work to discharge the capacitors of hundreds of sub-units on each valve tower. The second is the issue of safety. Due to the high voltage of the sub-unit, if the discharge resistor is not selected appropriately or the operation is improper, it is easy to cause voltage shock. In addition, the operating time of a single discharge rod is difficult to determine.

[0005] In view of this, it is necessary to propose a short-circuit discharge device for a converter valve capacitor and a converter valve to solve or at least alleviate the above-mentioned defects. Summary of the Invention

[0006] The main purpose of the present invention is to provide a short-circuit discharge device for a converter valve capacitor to solve the problems of large workload and safety issues in the discharge method in the prior art.

[0007] To achieve the above-mentioned object, the present invention provides a short-circuit discharge device for a converter valve capacitor, comprising a mounting mechanism, a longitudinal guide mechanism and a short-circuit discharge mechanism; wherein,

[0008] The mounting mechanism is used to be connected to the capacitor of the converter valve, and the longitudinal guide mechanism is connected to the mounting mechanism;

[0009] The short-circuit discharge mechanism includes a moving contact insulating rod, a stationary contact insulating rod, a plurality of contact units spaced apart in the longitudinal direction, and a plurality of short-circuit units arranged in sequence in the longitudinal direction, each of the contact units includes a discharge resistor, two stationary contact pieces spaced apart in the longitudinal direction, and each of the short-circuit units includes a conductive piece and an insulating piece connected to the moving contact insulating rod in parallel in the longitudinal direction; wherein,

[0010] The static contact insulating rod is connected to the mounting mechanism, one end of the dynamic contact insulating rod is used to be connected to the transmission rod of the converter valve so as to be slidably connected to the longitudinal guide mechanism along the longitudinal direction, the static contact insulating rod and the dynamic contact insulating rod are arranged at intervals along the transverse direction, the first end of the static contact piece is connected to the static contact insulating rod, the second end of the static contact piece is abutted against the short-circuit unit, the first ends of the two static contact pieces in each of the contact piece units are respectively connected to the positive and negative poles of the capacitor, and the discharge resistor is connected to the first end of the static contact piece connected to the positive pole of the capacitor.

[0011] Preferably, the mounting mechanism includes a plurality of mounting groups spaced apart in the longitudinal direction, each of the mounting groups includes two mounting units arranged opposite to each other in the longitudinal direction, each of the mounting units includes a mounting base and a supporting static insulator, the mounting base is used to be connected to the capacitor, the supporting static insulator is connected to the mounting base, and the static contact insulating rod is connected to the top of the supporting static insulator.

[0012] Preferably, the longitudinal guide mechanism includes a longitudinal guide rail, and each of the installation groups is correspondingly provided with one longitudinal guide rail, and both ends of the longitudinal guide rail are respectively connected to two adjacent installation bases.

[0013] Preferably, the short-circuit discharge mechanism further includes a sliding assembly, and each of the longitudinal guide rails is provided with a corresponding sliding assembly; wherein,

[0014] The sliding assembly includes a sliding block and a connecting static insulator. The sliding block is slidably connected to the longitudinal guide rail along the longitudinal direction. The connecting static insulator is connected to the sliding block. The dynamic contact insulating rod is connected to the top of the connecting static insulator.

[0015] Preferably, a connecting protrusion is formed on the first end of the static contact piece toward the end away from the dynamic contact insulating rod, and the connecting protrusions of the two static contact pieces in each contact piece unit are respectively connected to the positive and negative electrodes of the capacitor.

[0016] Preferably, the second end of each of the static contact pieces has two contacts.

[0017] Preferably, the longitudinal length of each of the conductive sheets is greater than the longitudinal distance between the two contacts in each of the static contact sheets.

[0018] Preferably, a boss is further included, and the two contacts at the second end of each of the static contact pieces are connected to the boss.

[0019] The present application also provides a converter valve, comprising a converter valve tower, a capacitor, a rotating assembly and an operating mechanism, wherein the converter valve tower comprises multiple layers of installation spaces arranged at intervals along the vertical direction, each layer of the installation space is connected to the capacitor, the operating mechanism is arranged on one side of the converter valve tower, multiple rotating assemblies are connected in sequence along the coaxial centerline in the vertical direction, and one rotating assembly is correspondingly arranged on one side of each layer of the installation space; wherein each rotating assembly comprises a support tube, a rotating arm and a transmission rod, the support tube located at the bottom layer is connected to the driving end of the operating mechanism, the rotating arm is connected to the support tube, and one end of the transmission rod is connected to the rotating arm, and further comprises multiple short-circuit discharge devices for converter valve capacitors as described above, each layer of the installation space is correspondingly provided with a short-circuit discharge device for converter valve capacitors, the installation mechanism of the short-circuit discharge device for converter valve capacitors is connected to the capacitor, and one end of the moving contact insulating rod of the short-circuit discharge device for converter valve capacitors is connected to the other end of the transmission rod.

[0020] Preferably, the number of the installation spaces is five.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides a short-circuit discharge device for a converter valve capacitor and a converter valve, comprising a mounting mechanism, a longitudinal guide mechanism and a short-circuit discharge mechanism. The short-circuit discharge mechanism comprises a moving contact insulating rod, a static contact insulating rod, a contact unit and a short-circuit unit. Each contact unit comprises a discharge resistor and two static contacts. Each short-circuit unit comprises a conductive sheet and an insulating sheet connected to the moving contact insulating rod. The static contact insulating rod is connected to the mounting mechanism. One end of the moving contact insulating rod is used to be connected to the transmission rod of the converter valve so as to be slidably connected to the longitudinal guide mechanism along the longitudinal direction. The static contact insulating rod and the moving contact insulating rod are arranged at intervals along the transverse direction. The first end of the static contact is connected to the static contact insulating rod, and the second end of the static contact abuts against the short-circuit unit. The first ends of the two static contacts in each contact unit are respectively connected to the positive and negative poles of the capacitor, and the discharge resistor is connected to the first end of the static contact connected to the positive pole of the capacitor. In this way, the operating mechanism of the converter valve is used to drive the rotating arm to rotate, and the transmission rod is used to drive the moving contact insulating rod to slide back and forth along the longitudinal guide mechanism. The disconnection or short-circuit between the static contact piece and the conductive piece is completed to complete the disconnection or short-circuit discharge between the positive and negative poles of the capacitor. It is easy to operate and can drive multiple short-circuit discharge mechanisms at one time to realize the discharge of multi-layer capacitors, greatly improving efficiency and adapting to the large workload of capacitor discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 A schematic elevation view of an application scenario of the overall structure in one embodiment of the present invention;

[0025] Figure 2 is a three-dimensional schematic diagram of a short-circuit discharge device in one embodiment of the present invention;

[0026] Figure 3 1 is a schematic plan view of a short-circuit discharge device in one embodiment of the present invention;

[0027] Figure 4 It is a partial enlarged schematic diagram of the mounting mechanism and the longitudinal guide mechanism in one embodiment of the present invention;

[0028] Figure 5 It is a partial schematic diagram of the connection between the rotating assembly and the moving contact insulating rod in one embodiment of the present invention.

[0029] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments.

[0030] Description of Figure Numbers:

[0031] 10. Mounting mechanism; 110. Mounting base; 120. Supporting static insulator; 20. Longitudinal guiding mechanism; 210. Longitudinal guide rail; 30. Short-circuit discharge mechanism; 310. Moving contact insulating rod; 320. Static contact insulating rod; 330. Contact piece unit; 331. Discharge resistor; 332. Static contact piece; 333. Connecting protrusion; 334. Boss; 340. Short-circuit unit; 341. Conductive piece; 342. Insulating piece; 350. Sliding assembly; 351. Sliding block; 352. Connecting static insulator; 40. Converter valve; 410. Converter valve tower; 420. Capacitor; 430. Rotating assembly; 431. Support tube; 432. Rotating arm; 433. Transmission rod; 440. Operating mechanism. DETAILED DESCRIPTION

[0032] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] Please see the attached Figure 1-5 In one embodiment of the present invention, a short-circuit discharge device for a converter valve 40 capacitor 420 includes a mounting mechanism 10, a longitudinal guide mechanism 20, and a short-circuit discharge mechanism 30. First, it should be noted that the longitudinal direction in this application refers to the length of the converter valve tower 410, and the transverse direction refers to the width of the converter valve tower 410. For details, please refer to the accompanying drawings; the details are as follows:

[0037] The mounting mechanism 10 is used to be connected to the capacitor 420 of the converter valve 40, and the longitudinal guide mechanism 20 is connected to the mounting mechanism 10; the short-circuit discharge mechanism 30 includes a moving contact insulating rod 310, a static contact insulating rod 320, a plurality of contact units 330 spaced apart in the longitudinal direction, and a plurality of short-circuit units 340 arranged in sequence in the longitudinal direction, each of the contact units 330 includes a discharge resistor 331, two static contact pieces 332 spaced apart in the longitudinal direction, and each of the short-circuit units 340 includes a conductive piece 341 and an insulating piece 342 connected to the moving contact insulating rod 310 in parallel in the longitudinal direction; wherein the static contact insulating rod 320 is connected to the On the mounting mechanism 10, one end of the dynamic contact insulating rod 310 is used to be connected to the transmission rod 433 of the converter valve 40 so as to be slidably connected to the longitudinal guide mechanism 20 along the longitudinal direction. The static contact insulating rod 320 and the dynamic contact insulating rod 310 are arranged at intervals in the transverse direction. The first end of the static contact piece 332 is connected to the static contact insulating rod 320, and the second end of the static contact piece 332 is abutted against the short-circuit unit 340. The first ends of the two static contact pieces 332 in each of the contact piece units 330 are respectively connected to the positive and negative poles of the capacitor 420, and the discharge resistor 331 is connected to the first end of the static contact piece 332 connected to the positive pole of the capacitor 420.

[0038] Specifically, the short-circuit discharge device for the converter valve 40 capacitor 420 in the present application includes an installation mechanism 10, a longitudinal guide mechanism 20 and a short-circuit discharge mechanism 30. The installation mechanism 10 is used for the installation of the longitudinal guide mechanism 20 and the short-circuit discharge mechanism 30, and is connected to the capacitor 420 to facilitate the subsequent short-circuit discharge mechanism 30 and the capacitor 420. The short-circuit discharge mechanism 30 is used to short-circuit with all DC capacitors of the converter valve tower 410, thereby achieving the purpose of discharge, so as to facilitate subsequent maintenance work by technical personnel.

[0039] In which, the short-circuit discharge mechanism 30 includes a moving contact insulating rod 310, a stationary contact insulating rod 320, a plurality of contact units 330 spaced apart in the longitudinal direction, and a plurality of short-circuit units 340 arranged sequentially in the longitudinal direction. The moving contact insulating rod 310 is used for mounting the short-circuit unit 340. The short-circuit unit 340 cooperates with the contact unit 330 and completes the disconnection and short-circuit between the short-circuit unit 340 and the contact unit 330 under the longitudinal movement of the moving contact insulating rod 310. Therefore, the stationary contact insulating rod 320 is connected to the mounting mechanism 10 and remains stationary, while the moving contact insulating rod 310 is slidably connected to the longitudinal guide mechanism 20 on the mounting mechanism 10, so that it can slide along the longitudinal guide mechanism 20. One end of the moving contact insulating rod 310 is connected to the transmission rod 433 of the converter valve 40, thereby being driven to slide by the transmission rod 433 of the converter valve 40.

[0040] Among them, each of the contact units 330 includes a discharge resistor 331 and two static contact pieces 332 spaced apart in the longitudinal direction. Each of the short-circuit units 340 includes a conductive piece 341 and an insulating piece 342 connected to the moving contact insulating rod 310 in parallel in the longitudinal direction. The first end of the static contact piece 332 is installed on the static contact insulating rod 320, and the first ends of the two static contact pieces 332 are respectively connected to the positive and negative poles of the capacitor, and the second end of the static contact piece 332 is used to contact the conductive piece 341 and the insulating piece 342 in the short-circuit unit 340; when short-circuit discharge is not performed, the second end of one static contact piece 332 is overlapped on the insulating piece 342, and the second end of the other static contact piece 332 is overlapped on the conductive piece 341. When short-circuit discharge is required, through The operating mechanism 440 rotates to drive the rotating arm 432 to rotate, and the transmission rod 433 connected to the rotating arm 432 drives the moving contact insulating rod 310 to slide longitudinally until the second ends of the two static contact pieces 332 are both overlapped on the conductive piece 341. A closed circuit is formed through the positive and negative poles of the capacitor in contact with the first ends of the two static contact pieces 332, thereby achieving the effect of short-circuiting and discharging. A discharge resistor 331 is provided on the first end of the static contact piece 332 connected to the positive pole of the capacitor 420, which can protect circuit components and limit the current. Before the two static contact pieces 332 are in contact with the conductive piece 341, the discharge is first performed by the discharge resistor 331. After the two static contact pieces 332 are moved to contact the conductive piece 341, they are short-circuited and discharged with the capacitor 420.

[0041] As a preferred embodiment of the present invention, the mounting mechanism 10 includes a plurality of mounting groups spaced apart in the longitudinal direction, each of the mounting groups includes two mounting units arranged opposite to each other in the longitudinal direction, each of the mounting units includes a mounting base 110 and a supporting static insulator 120, the mounting base 110 is used to be connected to the capacitor 420, the supporting static insulator 120 is connected to the mounting base 110, and the static contact insulating rod 320 is connected to the top of the supporting static insulator 120.

[0042] It should be noted that, by setting up multiple installation groups, the entire short-circuit discharge device can be extended and placed on the capacitor 420 of each layer of the converter valve tower 410, and the stability of the installation and placement is improved by uniform distribution. Each of the installation groups also includes two installation units arranged opposite to each other in the longitudinal direction. The two oppositely arranged installation units are used to facilitate the installation of the longitudinal guide mechanism 20, wherein each of the installation units includes a mounting base 110 and a supporting static insulator 120, and the mounting base 110 is used for the installation of the supporting static insulator 120 and the longitudinal guide mechanism 20, so that the two ends of the longitudinal guide mechanism 20 are respectively installed on two mounting bases 110, and each mounting base 110 is installed with a supporting static insulator 120 at the other end of the longitudinal guide mechanism 20, and the supporting static insulator 120 is used for the installation and connection of the static contact insulating rod 320.

[0043] As a preferred embodiment of the present invention, the longitudinal guide mechanism 20 includes a longitudinal guide rail 210 , and each installation group is provided with a corresponding longitudinal guide rail 210 , and both ends of the longitudinal guide rail 210 are respectively connected to two adjacent installation bases 110 .

[0044] It should be noted that the longitudinal guide rail 210 may adopt a convex-shaped structure in cross section, so that the top of the movable contact insulating rod 310 can be installed and the guiding effect is good.

[0045] As a preferred embodiment of the present invention, the short-circuit discharge mechanism 30 further includes a sliding assembly 350, and each of the longitudinal guide rails 210 is correspondingly provided with a sliding assembly 350; wherein,

[0046] The sliding assembly 350 includes a sliding block 351 and a connecting static insulator 352. The sliding block 351 is slidably connected to the longitudinal guide rail 210 along the longitudinal direction. The connecting static insulator 352 is connected to the sliding block 351. The dynamic contact insulating rod 310 is connected to the top of the connecting static insulator 352.

[0047] It is worth noting that the sliding assembly 350 is used to facilitate the sliding connection between the dynamic contact insulating rod 310 and the longitudinal guide rail 210. It includes a sliding block 351 and a connecting static insulator 352. The sliding block 351 can be slidably connected to the longitudinal guide rail 210, and its interior can be recessed to form a sliding groove to match the convex structure of the longitudinal guide rail 210; the connecting static insulator 352 is used to connect the dynamic contact insulating rod 310 and the slider to play a connecting role.

[0048] As a preferred embodiment of the present invention, the first end of the static contact piece 332 is protruded toward the end away from the dynamic contact insulating rod 310 to form a connecting protrusion 333, and the connecting protrusions 333 of the two static contact pieces 332 in each of the contact piece units 330 are respectively connected to the positive and negative poles of the capacitor 420.

[0049] It is noteworthy that the connection protrusion 333 can extend from the static contact insulating rod 320, so as to be protruding and connected to the positive and negative electrodes of the capacitor 420, which facilitates connection and assembly.

[0050] Furthermore, the second end of each of the static contact pieces 332 has two contacts.

[0051] It should be understood that the double contacts can increase the number of contact points and reduce arcing and heating caused by poor contact, thereby extending the service life of the contacts.

[0052] Furthermore, the longitudinal length of each of the conductive pieces 341 is greater than the longitudinal distance between the two contacts in each of the static contact pieces 332 .

[0053] It should be noted that, in this way, when short-circuiting discharge is performed, both contacts of the static contact piece 332 can be distributed on the conductive piece 341 .

[0054] Furthermore, a boss 334 is included, and the two contacts at the second end of each of the static contact pieces 332 are connected to the boss 334 .

[0055] It should be noted that the boss 334 can be silver-plated and press-fitted onto the contact to ensure a good connection at the contact and avoid poor contact.

[0056] The present application also provides a converter valve 40, including a converter valve tower 410, a capacitor 420, a rotating assembly 430 and an operating mechanism 440, wherein the converter valve tower 410 includes multiple layers of installation spaces arranged at intervals along the vertical direction, each layer of the installation space is connected to the capacitor 420, the operating mechanism 440 is arranged on one side of the converter valve tower 410, and multiple rotating assemblies 430 are connected in sequence along the vertical coaxial centerline, and one rotating assembly 430 is correspondingly arranged on one side of each layer of the installation space; wherein each rotating assembly 430 includes a support tube 431, a rotating arm 432 and a transmission rod 433, and the support tube 431 located at the bottom layer is connected to the capacitor 420. 1 is connected to the driving end of the operating mechanism 440, the rotating arm 432 is connected to the supporting tube 431, one end of the transmission rod 433 is connected to the rotating arm 432, and further includes a plurality of short-circuit discharge devices for the capacitor 420 of the converter valve 40 as described above, and each layer of the installation space is correspondingly provided with a short-circuit discharge device for the capacitor 420 of the converter valve 40, the installation mechanism 10 of the short-circuit discharge device for the capacitor 420 of the converter valve 40 is connected to the capacitor 420, and one end of the moving contact insulating rod 310 of the short-circuit discharge device for the capacitor 420 of the converter valve 40 is connected to the other end of the transmission rod 433.

[0057] It should be noted that the converter valve tower 410 usually has multiple layers of installation space, five layers in this application, and each layer of installation space is installed with multiple capacitors 420 arranged in sequence along the longitudinal direction. Therefore, each layer of capacitors 420 is correspondingly installed with a short-circuit discharge device, and each layer is also correspondingly provided with a rotating assembly 430 for driving the moving contact insulating rod 310 in the short-circuit discharge device to slide, wherein each of the rotating assemblies 430 includes a support tube 431, a rotating arm 432 and a transmission rod 433, and the support tube 431 of the bottom layer is directly connected to the driving end of the operating mechanism 440, and the support tubes 431 of each layer above are also fixedly connected to the coaxial centerline, so that through the operation The rotation of the driving end of the mechanism 440 can drive all the support tubes 431 to rotate, and each support tube 431 is equipped with a rotating arm 432, which rotates horizontally following the support tube 431. One end of the rotating arm 432 in each layer is connected to a transmission rod 433, and the other end of the transmission rod 433 is connected to one end of the dynamic contact insulating rod 310 in the corresponding layer. In this way, the rotation of the rotating arm 432 drives the dynamic contact insulating rod 310 to move through the transmission rod 433, and the dynamic contact insulating rod 310 slides longitudinally under the guidance of the longitudinal guide rail 210, thereby realizing the back and forth movement of the static contact piece 332 between the insulating piece 342 and the conductive piece 341, realizing the switching between the disconnection and discharge states.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A short-circuit discharge device for a converter valve capacitor, characterized in that: It includes a mounting mechanism, a longitudinal guiding mechanism and a short-circuit discharge mechanism; wherein, The mounting mechanism is used to be connected to the capacitor of the converter valve, and the longitudinal guide mechanism is connected to the mounting mechanism; The short-circuit discharge mechanism includes a moving contact insulating rod, a stationary contact insulating rod, a plurality of contact units spaced apart in the longitudinal direction, and a plurality of short-circuit units arranged in sequence in the longitudinal direction, each of the contact units includes a discharge resistor, two stationary contact pieces spaced apart in the longitudinal direction, and each of the short-circuit units includes a conductive piece and an insulating piece connected to the moving contact insulating rod in parallel in the longitudinal direction; wherein, The static contact insulating rod is connected to the mounting mechanism, one end of the dynamic contact insulating rod is used to be connected to the transmission rod of the converter valve so as to be slidably connected to the longitudinal guide mechanism along the longitudinal direction, the static contact insulating rod and the dynamic contact insulating rod are arranged at intervals along the transverse direction, the first end of the static contact piece is connected to the static contact insulating rod, the second end of the static contact piece is abutted against the short-circuit unit, the first ends of the two static contact pieces in each of the contact piece units are respectively connected to the positive and negative poles of the capacitor, and the discharge resistor is connected to the first end of the static contact piece connected to the positive pole of the capacitor.

2. The short-circuit discharge device for converter valve capacitor according to claim 1, characterized in that: The mounting mechanism includes a plurality of mounting groups spaced apart in the longitudinal direction, each of the mounting groups includes two mounting units arranged opposite to each other in the longitudinal direction, each of the mounting units includes a mounting base and a supporting static insulator, the mounting base is used to be connected to the capacitor, the supporting static insulator is connected to the mounting base, and the static contact insulating rod is connected to the top of the supporting static insulator.

3. The short-circuit discharge device for converter valve capacitor according to claim 2, characterized in that: The longitudinal guide mechanism includes a longitudinal guide rail. Each of the installation groups is correspondingly provided with one longitudinal guide rail. Both ends of the longitudinal guide rail are respectively connected to two adjacent installation bases.

4. The short-circuit discharge device for converter valve capacitor according to claim 3, characterized in that: The short-circuit discharge mechanism further includes a sliding assembly, and each of the longitudinal guide rails is provided with a corresponding sliding assembly; wherein, The sliding assembly includes a sliding block and a connecting static insulator. The sliding block is slidably connected to the longitudinal guide rail along the longitudinal direction. The connecting static insulator is connected to the sliding block. The dynamic contact insulating rod is connected to the top of the connecting static insulator.

5. The short-circuit discharge device for converter valve capacitor according to claim 1, characterized in that: A connecting protrusion is formed on the first end of the static contact piece toward the end away from the dynamic contact insulating rod, and the connecting protrusions of the two static contact pieces in each contact piece unit are respectively connected to the positive and negative electrodes of the capacitor.

6. The short-circuit discharge device for converter valve capacitor according to claim 1, characterized in that: The second end of each of the stationary contact pieces has two contacts.

7. The short-circuit discharge device for converter valve capacitor according to claim 6, characterized in that: The longitudinal length of each of the conductive pieces is greater than the longitudinal distance between the two contacts in each of the stationary contact pieces.

8. The short-circuit discharge device for converter valve capacitors according to claim 7, characterized in that: It also includes a boss, and the two contacts at the second end of each of the static contact pieces are connected to the boss.

9. A converter valve, comprising a converter valve tower, a capacitor, a rotating assembly, and an operating mechanism, wherein the converter valve tower comprises multiple layers of installation spaces spaced vertically apart, each layer of the installation spaces being connected to the capacitor, the operating mechanism being disposed on one side of the converter valve tower, the multiple rotating assemblies being vertically connected coaxially, with one rotating assembly correspondingly disposed on one side of each layer of the installation spaces; Each of the rotating components includes a support tube, a rotating arm and a transmission rod. The support tube located at the bottom layer is connected to the driving end of the operating mechanism, the rotating arm is connected to the support tube, and one end of the transmission rod is connected to the rotating arm. It is characterized in that it also includes a plurality of short-circuit discharge devices for the converter valve capacitor as described in any one of claims 1 to 8. There is a corresponding short-circuit discharge device for the converter valve capacitor in each layer of the installation space. The installation mechanism of the short-circuit discharge device for the converter valve capacitor is connected to the capacitor, and one end of the moving contact insulating rod of the short-circuit discharge device for the converter valve capacitor is connected to the other end of the transmission rod.

10. The converter valve according to claim 9, characterized in that: The number of the installation spaces is five.

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