An armored fixed indoor high-voltage DC metal-enclosed switchgear

Abstract

The present invention relates to an armored, fixed, indoor, high-voltage, direct current (DC) metal-enclosed switchgear, comprising a cabinet, a mechanism chamber and a circuit breaker chamber arranged side by side within the cabinet, and a cable chamber disposed at the lower end of the circuit breaker chamber. The circuit breaker chamber is provided with an isolating switch assembly, the isolating switch assembly including two isolating switches. A vacuum circuit breaker assembly is also connected between the mechanism chamber and the circuit breaker chamber. An isolating switch operating mechanism connected to both the isolating switch assembly and the vacuum circuit breaker assembly is disposed within the mechanism chamber. The mechanism chamber also includes an isolating switch operating mechanism connected to both the isolating switch assembly and the isolating switch operating mechanism. The present invention achieves system functionality by interconnecting the various units through the rational layout of the various component groups. The present invention also features a compact and rational layout and a comprehensive anti-error function. The use of mechanical DC circuit breakers in conjunction with the present invention will expand new modes of DC power transmission.

Description

Technical Field

[0001] The invention relates to the technical field of power distribution cabinet equipment, in particular to an armored fixed indoor high-voltage direct current metal-enclosed switchgear. Background Art

[0002] High-voltage metal-enclosed switchgear, as indoor power distribution equipment, is widely used in medium-voltage systems to receive and distribute electrical energy. The live parts are completely enclosed by a metal conductor connected to the grounding system, forming a protective barrier for the human body. Its safety is widely recognized. With the maturity of high-power semiconductor devices and technological breakthroughs in solving DC regulation problems, DC systems of various voltage levels, with their inherent advantages, have become a new option for renewable energy transmission. DC metal-enclosed switchgear is attracting increasing attention.

[0003] Compared to AC transmission, HVDC transmission offers lower overall investment, longer transmission distances, and lower transmission losses. With the expansion and application of renewable energy sources such as photovoltaic and wind power, the use of microgrids in medium and low voltage applications is increasing. In addition to offering greater capacity and lower losses than AC transmission, DC microgrids offer improved power reliability, power quality, controllability, and economic benefits, making them more suitable for flexible load networking. DC microgrids also feature asynchronous interconnection, allowing them to connect grids with different frequencies, making them a crucial component of today's smart grids.

[0004] As the application of DC microgrids in the medium and low voltage fields is in its infancy, mature metal-enclosed switchgear is not suitable for the installation of mechanical DC circuit breakers. Current metal-enclosed switchgear has the following problems:

[0005] Traditional AC distribution cabinets are three-phase systems, while DC is unipolar, so they cannot be directly used for DC power transmission and distribution. Furthermore, DC distribution requires the installation of components such as high-voltage capacitors, inductors, and resistors, necessitating the design of specialized cabinets. High-voltage disconnect switches, essential for ensuring maintenance safety, also required a redesigned layout to accommodate these new cabinet requirements.

[0006] The interlocking design of traditional distribution cabinets varies according to the different operating mechanisms. The traditional interlocking is "rigid", that is, when the circuit breaker is closed, the crank arm linked to the circuit breaker main shaft will directly push out a mechanical interlocking part, blocking the isolation operation. Since the energy required to close the circuit breaker is relatively large, it is easy to cause damage to the interlocking parts and lead to the failure of the interlocking device.

[0007] To this end, we propose an armored fixed indoor high-voltage DC metal-enclosed switchgear. Summary of the Invention

[0008] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides an armored fixed indoor high-voltage DC metal-enclosed switchgear, which adopts a DC circuit breaker for fixed installation, a cable entry and exit method, and is equipped with a bidirectional isolating switch for the entry and exit lines. The entry and exit lines operate synchronously, and after the isolation is opened, the grounding switch is closed at the same time, so that the conductors in the cabinet are reliably grounded to protect the safety of people entering the interval.

[0009] The technical solutions adopted in the present invention are as follows:

[0010] An armored fixed indoor high-voltage DC metal-enclosed switchgear comprises a cabinet, a mechanism chamber and a circuit breaker chamber arranged side by side in the cabinet, and a cable chamber arranged at the lower end of the circuit breaker chamber;

[0011] The circuit breaker chamber is provided with an isolating switch assembly, which includes two isolating switches for isolating the outgoing line side and the incoming line side, and the two isolating switches extend into the cable chamber to connect with corresponding cables;

[0012] A vacuum circuit breaker assembly is also connected between the mechanism chamber and the circuit breaker chamber. The vacuum circuit breaker assembly includes a plurality of circuit breakers for controlling the opening and closing of different paths.

[0013] The mechanism room is provided with an interlocking assembly connected to both the isolating switch assembly and the vacuum circuit breaker assembly, for controlling the operation of the isolating switch assembly and the vacuum circuit breaker assembly;

[0014] The mechanism room is provided with an operation interlock device connected to both the isolating switch assembly and the isolating switch operating mechanism. The operation interlock device is used to control the operation of the vacuum circuit breaker assembly, display the status of the vacuum circuit breaker assembly, and intermittently isolate the isolating switch assembly.

[0015] It is further characterized by:

[0016] The cabinet is also provided with a high-voltage capacitor room, a low-voltage capacitor room, and an instrument room, and the mechanism room, cable room, circuit breaker room, high-voltage capacitor room, low-voltage capacitor room, and instrument room in the cabinet are distributed counterclockwise;

[0017] The high-voltage capacitor chamber and the low-voltage capacitor chamber are arranged side by side and located above the circuit breaker chamber. The instrument chamber is located above the mechanism chamber. Electrical components such as a rectifier and a capacitor charger are installed inside the instrument chamber. A pressure relief channel is designed at the rear of the cabinet. After a failure occurs in each functional unit, the pressure is released backward and then discharged upward along the channel to ensure the personal safety of people behind the cabinet.

[0018] The terminals on its high voltage capacitor extend into the circuit breaker compartment.

[0019] A sealing plate partition is provided between the circuit breaker chamber and the mechanism chamber, and an observation window is provided on the sealing plate partition for observing the status of the electrical components in the high-voltage chamber. The high-voltage capacitor chamber, the low-voltage capacitor chamber and the circuit breaker chamber are all closed compartments formed by partitions.

[0020] The vacuum circuit breaker assembly includes a mechanism box arranged in a mechanism chamber, and a commutation circuit breaker, a main circuit breaker and a charging circuit breaker arranged in the circuit breaker chamber. A repulsive permanent magnet mechanism is provided in the mechanism box for controlling the opening and closing of the commutation circuit breaker, the main circuit breaker and the charging circuit breaker in the circuit breaker chamber;

[0021] The lower ends of the converter circuit breaker, main circuit breaker and charging circuit breaker are connected to the same chassis, and a pull rod is provided in the chassis, which is connected to the drive shaft of the repulsive permanent magnet mechanism. At the same time, the pull rod also controls the connection of the converter circuit breaker transmission bracket, the main circuit breaker transmission bracket and the charging circuit breaker transmission bracket respectively, and the converter circuit breaker transmission bracket, the main circuit breaker transmission bracket and the charging circuit breaker transmission bracket respectively control the opening and closing of the converter circuit breaker, the main circuit breaker and the charging circuit breaker.

[0022] A manual trip shaft is connected to the upper end of the mechanism box, and the rotation of the manual trip shaft can control the operation of the repulsive permanent magnet mechanism. At the same time, a tripping state lever arm is connected to the side wall of the mechanism box and is sleeved on the manual trip shaft to control the operation of the repulsive permanent magnet mechanism.

[0023] The isolating switch assembly includes a base frame, on which are arranged two sets of single-stage isolating switches each consisting of a wall bushing, a support insulator, and a pull rod insulator. The two sets of isolating switches respectively control incoming line isolation and outgoing line isolation, and a grounding bracket for grounding is arranged on the base frame;

[0024] The two disconnectors are connected to the same main shaft. One end of the rod insulator is hinged to the main shaft through a connecting rod. The lower end of the rod insulator is hinged to a contact knife. As the main shaft is installed, the connecting rod is driven to rotate, and the rod insulator is driven to rotate through the connecting rod. One end of the contact knife is hinged to the lower end of the wall bushing, and the other end of the contact knife intermittently contacts the moving contact on the support insulator as the rod insulator rotates to achieve opening and closing.

[0025] The main shaft is connected to the grounding shaft through a crank structure formed by a linkage arm and a linkage plate. The grounding shaft is movably plugged into the base frame, and two grounding knives corresponding to the isolation switches are connected to the grounding shaft. The movable end of the grounding knife is intermittently connected to the grounding contact connected to the lower end of the wall bushing as the grounding shaft rotates, thereby controlling intermittent grounding.

[0026] The movement directions of the contact knife and the grounding knife are always opposite.

[0027] The bottom frame of the isolating switch assembly and the bottom surfaces of the multiple circuit breakers are sealed by a metal sealing plate.

[0028] The isolating switch operating mechanism includes a rear plate and a front plate that are arranged parallel to each other, and a plurality of support columns that are arranged in a matrix and connect the rear plate and the front plate together;

[0029] The front splint is movably connected to an active cam assembly, which is composed of an operating shaft, an eccentric wheel and an active cam. The operating shaft is movably plugged into the front splint, and the active cam is connected to the side of the front splint close to the rear splint, and the eccentric wheel is fixedly sleeved between the front splint and the active cam.

[0030] A passive wheel matching the active cam is movably plugged into the rear splint, and two positioning grooves are provided on the side wall of the passive wheel. Positioning claws for limiting the passive wheel are intermittently clamped on the positioning grooves. The positioning claws are connected between the rear splint and the front splint via a pin shaft that is movably inserted through the positioning claws. One end of the pin shaft passes through the rear splint and is sleeved with a bent plate, and the other end of the bent plate touches the first micro switch and controls the opening and closing of the first micro switch.

[0031] The passive wheel can automatically rotate with the rotation of the active cam. The active cam includes a protrusion and a plurality of active tooth sockets connected to the protrusion and distributed in an annular shape. The protrusion can intermittently push the positioning claw to disengage the positioning claw from the positioning groove. The passive wheel is connected to the passive tooth socket corresponding to the active tooth socket, and there is an interval between the active tooth socket and the passive tooth socket.

[0032] An output crank arm is sleeved on the output shaft, and the output crank arm is connected to the main shaft of the isolating switch assembly and controls the separation and connection of the isolating switch assembly;

[0033] The positioning claw is also fixedly connected to a torsion spring core sleeve sleeved on the pin shaft, and a torsion spring is sleeved on the torsion spring core sleeve, one end of the torsion spring is fixed to the positioning claw, and the other end of the torsion spring is fixed to the front clamping plate;

[0034] The upper end of one side of the front splint is fixedly connected to a sliding sleeve mounting plate, the upper end of the sliding sleeve mounting plate is connected to a sliding sleeve, a manual push rod assembly can be inserted into the sliding sleeve, the manual push rod assembly is connected to a circuit breaker manual tripping arm, the circuit breaker manual tripping arm is connected to a manual tripping shaft plugged into the upper end of the mechanism box, the rotation of the manual tripping shaft can control the operation of the repulsive permanent magnet mechanism, and the manual push rod assembly is also connected to the interlocking assembly.

[0035] The interlock assembly includes an operating panel, an inner side of which is provided with a horizontally slidable interlock baffle assembly, the interlock baffle assembly including a movable plate, at least two guide nuts connected to a side of the operating panel close to the movable plate, and the guide nuts slide in guide holes horizontally provided on the movable plate, and a slidable top plate is further connected to the operating panel, the top plate being connected to the movable plate, and as the movable plate drives the top plate to move, it can intermittently touch the opening and closing state crank arm, and can also control the operation of the repulsive permanent magnet mechanism, and then control multiple circuit breakers;

[0036] The manual trip push rod assembly is plugged into the operation panel, one end of the manual trip push rod assembly passes through one end of the operation panel and is connected to the manual trip button, the other end of the manual trip push rod assembly passes through the sliding sleeve and is connected to the guide shaft and the connecting nut, and a reset spring is sleeved on a section of the guide shaft located between the manual trip crank arm of the circuit breaker and the operating mechanism of the disconnector, and a slideway is further provided on the manual trip crank arm of the circuit breaker to facilitate the sliding of the guide shaft, and the reset spring can be provided to adjust the telescopic movement of the manual trip push rod assembly after being pressed;

[0037] The hand-disconnect push rod assembly includes a front boss, a recessed portion, a rear boss, and a hand-disconnecting rod that are interconnected to form a stepped structure. The thickness of each step is different. At the same time, a narrow groove, a round groove, and a wide groove that are interconnected are provided on the movable plate. The width of the recessed portion is the same as the thickness of the movable plate. A pad is connected to the movable plate along the circumference of the wide groove to increase the thickness of the wide groove and limit the movement of the recessed portion into the wide groove.

[0038] The movable plate is provided with a first sliding hole, and the bracket is slidably connected in the first sliding hole, and the bracket slides in the first sliding hole through the slider connected thereto, and one end of the slider passes through the first sliding hole and is connected to a positioning plate, and the positioning plate extends to the second sliding hole opened on the operation panel, the positioning plate and the second sliding hole have the same length, and a plurality of first fixing holes are connected to the positioning plate, and a spherical through hole is provided on the upper end of the bracket close to the side of the movable plate, and a steel ball that resists the movable plate is connected in the spherical through hole, and a leaf spring that applies pressure to the steel ball is connected to the bracket, so that the steel ball is engaged with the positioning hole opened in the movable plate with a certain force, and a plurality of inclined positioning holes are also provided on the movable plate;

[0039] The movable plate is connected to a paddle extending to the second sliding hole, the length of the paddle is smaller than the second sliding hole, and the paddle can move left and right in the second sliding hole;

[0040] The operating panel is provided with an operating circular hole for inserting the operating handle, and the movable plate is provided with an operating hole corresponding to the operating circular hole;

[0041] There are three positioning holes, and when the corresponding paddle moves to the rightmost end, the middle end and the leftmost end of the second sliding hole, they correspond to the isolation operation position, the manual opening position and the running position respectively.

[0042] The beneficial effects of the present invention are as follows:

[0043] The present invention has a compact and reasonable structure and is easy to operate. Through the reasonable layout of the positions of each group of components, the units are connected to each other to realize the system function. At the same time, it has the characteristics of compact and reasonable layout and perfect anti-error function. The use of mechanical DC circuit breaker in conjunction with the present invention will expand a new mode of DC power transmission.

[0044] At the same time, the present invention also has the following advantages:

[0045] (1) By arranging the counterclockwise distribution mechanism room A, cable room C, circuit breaker room B, high-voltage capacitor room D, low-voltage capacitor room E, and instrument room F in the cabinet 5, the electrical components can be reasonably installed in different areas according to their functional characteristics to achieve the purpose of safe and stable operation.

[0046] (2) The automatic unlocking and locking function of the isolation operating mechanism between the open and closed positions can be realized through a simple structural combination. Unless a force with operating intention is applied to the operating shaft, the switch will be reliably locked in the open or closed position, and mechanical (indicator arm) and electrical (micro switch) two indication status signals will be given at the open and closed positions. It is small in size, more beautiful, and has strong practicality.

[0047] (3) By setting up the interlocking components, the operation selection can only be carried out according to the steps, and the selected operation position can only perform the allowed operation. Other operations do not have the necessary conditions for operation at the current position. It is impossible to switch to other operation modes before the current operation is completed, thereby avoiding device failure caused by brute force operation, easy operation and high safety.

[0048] (4) The present invention has complete functions, compact size, safe and reliable operation, can reduce the size of DC switch cabinet, has a simple structure, and fully meets the usual five-protection interlocking requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is the front view of the present invention.

[0050] Figure 2 for Figure 1 Cross-sectional view of section AA.

[0051] Figure 3 It is a schematic diagram of the connection structure of the interlocking assembly, disconnector operating mechanism, vacuum circuit breaker assembly and disconnector assembly of the present invention.

[0052] Figure 4 It is a side view of the interlocking assembly of the present invention.

[0053] Figure 5It is a schematic diagram of the three-dimensional structure of the interlocking assembly of the present invention.

[0054] Figure 6 It is the front view of the interlocking assembly of the present invention.

[0055] Figure 7 It is a schematic diagram of the connection structure of the interlock baffle assembly, manual opening button and manual opening push rod assembly in the interlock assembly of the present invention.

[0056] Figure 8 It is a structural schematic diagram of the interlocking baffle assembly in the interlocking assembly of the present invention.

[0057] Figure 9 It is a schematic diagram of the three-dimensional structure of the vacuum circuit breaker assembly of the present invention.

[0058] Figure 10 It is a cross-sectional schematic diagram of the vacuum circuit breaker assembly of the present invention.

[0059] Figure 11 It is a schematic diagram of the three-dimensional structure of the operating mechanism of the disconnector of the present invention.

[0060] Figure 12 It is a side view of the operating mechanism of the isolating switch of the present invention.

[0061] Figure 13 The figure is a schematic diagram of the connection structure of the eccentric wheel, the active cam, the passive wheel and the positioning claw in the operating mechanism of the disconnector of the present invention.

[0062] Figure 14 It is a schematic diagram of the three-dimensional structure of the isolating switch assembly of the present invention.

[0063] Figure 15 It is a structural schematic diagram of the isolating switch assembly of the present invention when the contact knife is in the open state.

[0064] in:

[0065] 1. Interlock assembly; 2. Disconnector operating mechanism; 3. Vacuum circuit breaker assembly; 4. Disconnector assembly; 5. Cabinet; A. Mechanism room; B. Circuit breaker room; C. Cable room; D. High-voltage capacitor room; E. Low-voltage capacitor room; F. Instrument room;

[0066] 101. Manual trip button; 102. Interlock baffle assembly; 103. Operation panel; 104. Connecting nut; 105. Return spring; 106. Manual trip arm for circuit breaker; 107. Manual trip push rod assembly; 108. Second micro switch; 109. Guide nut; 110. Top plate; 111. Bracket; 112. Positioning plate; 1021. Spacer; 1022. Paddle; 1023. Push rod; 1024. Operation hole; 1025. Narrow slot; 1026. Round slot; 1027. Wide slot; 1028. Guide hole; 1029. Movable plate; 10210. Positioning hole; 10211. First sliding hole; 1031. Second sliding hole.

[0067] 201, support plate; 202, rear splint; 203, support column; 204, sliding sleeve; 205, sliding sleeve mounting plate; 206, mounting bracket; 207, front splint; 208, indicator crank arm; 209, bending plate; 211, pin; 212, output crank arm; 213, operating shaft; 214, eccentric wheel; 215, active cam; 216, driven wheel; 217, positioning claw; 218, torsion spring; 219, torsion spring core sleeve;

[0068] 301, mechanism box; 302, chassis; 303, commutation circuit breaker; 304, main circuit breaker; 305, charging circuit breaker; 3011, manual trip shaft; 3012, opening and closing state lever; 3013, repulsive permanent magnet mechanism; 3021, pull rod; 3031, commutation circuit breaker transmission bracket; 3041, main circuit breaker transmission bracket; 3051, charging circuit breaker transmission bracket;

[0069] 401. Grounding bracket; 402. Wall bushing; 403. Pillar insulator; 404. Base frame; 405. Linkage arm; 406. Main shaft; 407. Grounding knife; 408. Moving contact; 409. Linkage plate; 410. Pull rod insulator; 411. Grounding shaft; 412. Contact knife; 413. Grounding contact. DETAILED DESCRIPTION

[0070] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0071] like Figures 1-15 As shown, this embodiment discloses an armored fixed indoor high-voltage DC metal-enclosed switchgear, including a cabinet 5. The cabinet 5 is provided with a mechanism chamber A, a cable chamber C, a circuit breaker chamber B, a high-voltage capacitor chamber D, a low-voltage capacitor chamber E, and an instrument chamber F arranged in a counterclockwise direction. The electrical components can be reasonably installed in different areas according to their functional characteristics to achieve the purpose of safe and stable operation.

[0072] Characterized by the fact that the device has different functional compartments, such as Figure 1As shown, the mechanism chamber A and the circuit breaker chamber B are arranged side by side in the middle of the cabinet 5. A sealing plate partition is set between the circuit breaker chamber B and the mechanism chamber A. An observation window is set on the sealing plate partition to observe the status of the electrical components in the high-voltage chamber. The mechanism chamber A is equipped with an interlocking assembly 1 and an isolating switch operating mechanism 2 that are interconnected.

[0073] An isolating switch assembly 4 is installed in the circuit breaker chamber B, and a vacuum circuit breaker assembly 3 is also connected between the mechanism chamber A and the circuit breaker chamber B. The interlock assembly 1 is connected to both the isolating switch operating mechanism 2 and the vacuum circuit breaker assembly 3, and controls the driving of the vacuum circuit breaker assembly 3 and displays the operating status of the vacuum circuit breaker assembly 3. The isolating switch operating mechanism 2 is connected to both the vacuum circuit breaker assembly 3 and the isolating switch assembly 4, and controls the opening and closing of the isolating switch assembly 4 and the vacuum circuit breaker assembly 3.

[0074] The cable chamber C is located at the bottom of the circuit breaker chamber B and can be used to connect incoming and outgoing cables. The disconnector assembly 4 passes through the circuit breaker chamber B and extends into the cable chamber C, making it convenient for the incoming and outgoing cables to be directly connected to the contact seat of the disconnector assembly 4.

[0075] The high-voltage capacitor chamber D and the low-voltage capacitor chamber E are arranged side by side and located above the circuit breaker chamber B. The high-voltage capacitor chamber D, the low-voltage capacitor chamber E and the circuit breaker chamber B are all closed compartments formed by partitions.

[0076] The instrument room F is located above the mechanism room A and in front of the low-voltage capacitor room E. Electrical components such as the rectifier and capacitor charger are installed inside the instrument room F. A pressure relief channel is designed at the rear of the cabinet. After a failure occurs in each functional unit, the pressure is released backward and then discharged upward along the channel to ensure the personal safety of people behind the cabinet.

[0077] The high-voltage capacitor in the high-voltage capacitor chamber D is inverted, and the terminals on the high-voltage capacitor extend into the circuit breaker chamber B and are connected to the main busbar through a copper busbar. A high-voltage reactor is installed on the side wall of the circuit breaker chamber B and is connected to the high-voltage capacitor and the main busbar through a copper busbar.

[0078] The vacuum circuit breaker assembly 3 includes a mechanism box 301 arranged in the mechanism chamber A, and a commutation circuit breaker 303, a main circuit breaker 304 and a charging circuit breaker 305 arranged in the circuit breaker chamber B. A repulsive permanent magnet mechanism 3013 is provided in the mechanism box 301 for controlling the opening and closing of the commutation circuit breaker 303, the main circuit breaker 304 and the charging circuit breaker 305 in the circuit breaker chamber B. Specifically, the lower ends of the commutation circuit breaker 303, the main circuit breaker 304 and the charging circuit breaker 305 are connected to the same chassis 302, and a pull rod 3021 is provided in the chassis 302. The pull rod 3021 is connected to the drive shaft of the repulsive permanent magnet mechanism 3013, and the pull rod 3021 also controls the connection of the commutation circuit breaker transmission shaft. The commutator circuit breaker transmission bracket 3031, the main circuit breaker transmission bracket 3041 and the charging circuit breaker transmission bracket 3051 respectively control the opening and closing of the commutator circuit breaker 303, the main circuit breaker 304 and the charging circuit breaker 305. At the same time, a manual trip shaft 3011 is plugged into the upper end of the mechanism box 301. The rotation of the manual trip shaft 3011 can control the operation of the repulsive permanent magnet mechanism 3013. At the same time, an opening and closing state lever 3012 connected to the output shaft of the repulsive permanent magnet mechanism 3013 is also plugged into the side wall of the mechanism box 301 to indicate the working state of the repulsive permanent magnet mechanism 3013.

[0079] like Figure 14-15 As shown, the disconnector assembly 4 includes a base frame 404, on which are mounted two sets of single-pole disconnectors, each consisting of a wall bushing 402, a support insulator 403, and a pull rod insulator 410. The two sets of disconnectors respectively control incoming line isolation and outgoing line isolation, and a grounding bracket 401 for grounding is mounted on the base frame 404.

[0080] The two single-pole disconnectors are connected to a common main shaft 406. One end of a tie rod insulator 410 is hinged to the main shaft 406 via a connecting rod. A contact blade 412 is hinged at the lower end of the tie rod insulator 410. Rotation of the main shaft 406 drives the connecting rod, which in turn drives the tie rod insulator 410. One end of the contact blade 412 is hinged to the lower end of the wall bushing 402. The other end of the contact blade 412 intermittently contacts the moving contact 408 on the post insulator 403 as the tie rod insulator 410 rotates, achieving switching.

[0081] The crank structure formed by the linkage arm 405 and the linkage plate 409 on the main shaft 406 is connected to the grounding shaft 411. The grounding shaft 411 is movably plugged into the base frame 404, and two grounding knives 407 corresponding to the isolating switches are connected to the grounding shaft 411. The movable end of the grounding knife 407 is intermittently connected to the grounding contact 413 connected to the lower end of the wall sleeve 402 as the grounding shaft 411 rotates, thereby controlling intermittent grounding.

[0082] At the same time, the structure of the main shaft 406, the linkage arm 405 and the linkage plate 409, the movement directions of the contact knife 412 and the grounding knife 407 are always opposite, that is, the contact knife 412 and the grounding knife 407 will not close with the corresponding contacts at the same time, ensuring that the safety grounding protection is promptly activated after the main circuit is cut off.

[0083] The base frame 404 of the isolating switch assembly 4 and the bottom surfaces of the multiple circuit breakers are sealed by a metal sealing plate. A grounding bracket 401 is also provided on the base frame 404 to meet the purpose of connecting and isolating the charging circuit breaker 305 to the charging circuit.

[0084] The through-the-wall grounding isolating switch assembly 4, with the assistance of the sealing plate, completes the isolation function, the grounding function and the compartment sealing function.

[0085] In order to facilitate driving the isolating switch assembly 4, the isolating switch operating mechanism 2 is connected to the main shaft 406 of the isolating switch assembly 4;

[0086] like Figure 11-13 As shown, the disconnector operating mechanism 2 includes a rear plate 202 and a front plate 207 that are arranged parallel to each other, and a plurality of support columns 203 that are arranged in a matrix and connect the rear plate 202 and the front plate 207 together;

[0087] The front plate 207 is movably connected to an active cam assembly, which is composed of an operating shaft 213, an eccentric wheel 214, and an active cam 215. The operating shaft 213 is movably plugged into the front plate 207. The active cam 215 is connected to the side of the front plate 207 close to the rear plate 202, and the eccentric wheel 214 is fixedly sleeved between the front plate 207 and the active cam 215. A non-circular hole is provided on the operating shaft 213 to facilitate the operation of the operating handle to drive the operating shaft 213 to rotate.

[0088] A passive wheel 216 matching the active cam 215 is movably connected to the rear splint 202. Two positioning grooves are provided on the side wall of the passive wheel 216. Positioning claws 217 for limiting the passive wheel 216 are intermittently connected to the positioning grooves. The positioning claws 217 are connected between the rear splint 202 and the front splint 207 through a pin shaft 211 that is movably inserted through the positioning claws 217. One end of the pin shaft 211 that passes through the rear splint 202 is sleeved with a bent plate 209, and the other end of the bent plate 209 touches the first micro switch and controls the opening and closing of the first micro switch. The opening and closing of the first micro switch can give an electrical signal to remind the operator whether the isolating switch has reached the specified position;

[0089] The passive wheel 216 can automatically rotate with the rotation of the active cam 215. The active cam 215 includes a protrusion and a plurality of active tooth sockets connected to the protrusion and distributed in a ring. The protrusion can intermittently push the positioning claw 217 to disengage the positioning claw 217 from the positioning groove. The passive wheel 216 is connected to a passive tooth socket corresponding to the active tooth socket. At the same time, there is a certain interval between the active tooth socket and the passive tooth socket, which can reserve time for the active cam 215 to push the positioning claw 217 to separate from the passive wheel 216.

[0090] The driven wheel 216 passes through one end of the rear clamping plate 202 and is connected to an output shaft, and an output crank arm 212 is sleeved on the output shaft. The output crank arm 212 is connected to the main shaft 406 of the isolating switch assembly 4 and controls the opening and closing of the isolating switch assembly 4.

[0091] The positioning claw 217 is also fixedly connected to a torsion spring core sleeve 219 which is sleeved on the pin shaft 211, and a torsion spring 218 is sleeved on the torsion spring core sleeve 219. One end of the torsion spring 218 is fixed to the positioning claw 217, and the other end of the torsion spring 218 is fixed to the front splint 207. The torsion spring 218 can provide a torque to bring the positioning claw 217 close to the passive wheel 216, so that the positioning claw 217 can be clipped into the positioning groove on the passive wheel 216.

[0092] The eccentric wheel 214 contacts and pushes the indicator crank arm 208 to rotate. The rotation of the indicator crank arm 208 can visualize the rotation angle of the operating shaft 213, making it convenient to check the engagement position of the positioning claw 217 and the positioning groove later. The indicator crank arm 208 is hinged on the front splint 207;

[0093] In order to facilitate the limiting of the output shaft and improve the stability of the output crank arm 212, a support plate 201 is movably connected to the other end of the output shaft, and the support plate 201 is connected to the rear clamping plate 202 through a plurality of support columns 203;

[0094] An external operating handle is inserted into the operating shaft 213 to drive the eccentric wheel 214 and the active cam 215 to rotate clockwise or counterclockwise. The eccentric wheel 214 drives the indicating arm 208 to move to complete the indication of the opening and closing positions. At the same time, the protrusion lifts or leaves the positioning claw 217, driving the bent plate 209 fixed on the pin shaft 211 to rotate, thereby controlling the opening and closing of the first micro switch. As the first micro switch opens and closes, it can indicate whether the isolating switch has reached the specified position.

[0095] At the same time, as the positioning claw 217 is lifted, the active tooth will continue to drive the passive wheel 216 to move, driving the output crank arm 212 connected thereto to move, and the output crank arm 212 is connected to the isolation switch assembly 4, thereby realizing the separation and connection function of the isolation switch assembly 4.

[0096] Through the above-mentioned characteristic description, the automatic unlocking and locking function of the isolation operating mechanism between the open and closed positions can be realized. Unless a force with operating intention is applied to the operating shaft 213, the switch will be reliably locked and mechanical (indicating the crank arm 208) and electrical (first micro switch) status signals will be given at the open and closed positions.

[0097] The lower ends of the rear splint 202 and the front splint 207 are respectively connected to mounting brackets 206, which are C-shaped structures. The mounting bracket 206 clamps and connects the rear splint 202 and the front splint 207 together through a bolt assembly, and mounting holes are opened on the mounting bracket 206 to facilitate fixation with the cabinet body 5.

[0098] The upper end of one side of the front splint 207 is fixedly connected to the sliding sleeve mounting plate 205, and the upper end of the sliding sleeve mounting plate 205 is connected to the sliding sleeve 204. The manual push rod assembly 107 can be inserted into the sliding sleeve 204, and the manual push rod assembly 107 is connected to the circuit breaker manual tripping arm 106. The circuit breaker manual tripping arm 106 is connected to the manual tripping shaft 3011 inserted at the upper end of the mechanism box 301. The rotation of the manual tripping shaft 3011 can control the operation of the repulsive permanent magnet mechanism 3013, thereby controlling the opening and closing of multiple circuit breakers. The manual push rod assembly 107 is also connected to the interlocking assembly 1.

[0099] like Figure 3-Figure 8 As shown, the interlocking assembly 1 includes an operating panel 103, and a horizontally slidable interlocking baffle assembly 102 is provided on the inner side of the operating panel 103. The interlocking baffle assembly 102 includes a movable plate 1029. At least two guide nuts 109 are connected to the side of the operating panel 103 close to the movable plate 1029, and the guide nuts 109 slide in the guide holes 1028 horizontally provided on the movable plate 1029, which can ensure relatively stable sliding of the interlocking baffle assembly 102 and the operating panel 103. A slidable top plate 110 is also connected to the operating panel 103, and the top plate 110 is connected to the movable plate 1029. As the movable plate 1029 drives the top plate 110 to move, it can intermittently touch the opening and closing state crank arm 3012, so that the working state of the repulsive permanent magnet mechanism 3013 can be indicated.

[0100] The manual push rod assembly 107 is inserted into the operation panel 103, and one end of the manual push rod assembly 107 passes through one end of the operation panel 103 and is connected to the manual trip button 101, and the other end of the manual push rod assembly 107 passes through the sliding sleeve 204 to connect the guide shaft and the connecting bolt 104, and the guide shaft is located between the manual trip arm 106 of the circuit breaker and the disconnector operating mechanism 2 and is sleeved with a reset spring 105. The manual trip arm 106 of the circuit breaker is also provided with a slideway for facilitating the sliding of the guide shaft. By setting the reset spring 105, the manual push rod assembly 107 can be telescopically adjusted after being pressed. The trip operation of the DC vacuum circuit breaker can be controlled by the manual push rod assembly 107. After the manual trip button 101 is pressed, the manual push rod assembly 107 will push the manual trip arm 106 of the circuit breaker to move. After the manual trip arm 106 of the circuit breaker moves, it drives the manual trip shaft 3011 to rotate, thereby being able to control multiple DC vacuum circuit breakers.

[0101] The manual separation push rod assembly 107 includes a front boss, a recessed portion, a rear boss and a manual separation connecting rod that are interconnected to form a stepped structure, and the thickness of different steps is different. At the same time, the movable plate 1029 is provided with a narrow groove 1025, a circular groove 1026 and a wide groove 1027 that are interconnected. The width of the recessed portion is the same as the thickness of the movable plate 1029. A pad 1021 is connected to the movable plate 1029 along the circumference of the wide groove 1027 to increase the thickness of the wide groove 1027, which can limit the movement of the recessed portion into the wide groove 1027. The recessed portion can only slide between the circular groove 1026 and the narrow groove 1025. The manual separation push rod assembly 107 can be moved into the wide groove 1027 only when the recessed portion moves into the circular groove 1026 and then the manual separation button 101 is pressed to move the front boss to the rear side of the pad 1021.

[0102] The movable plate 1029 is provided with a first sliding hole 10211, and a bracket 111 is slidably connected in the first sliding hole 10211. The bracket 111 slides in the first sliding hole 10211 through the slider connected thereto. One end of the slider passes through the first sliding hole 10211 and is connected to a positioning plate 112, and the positioning plate 112 extends to the second sliding hole 1031 provided on the operation panel 103. The positioning plate 112 has the same length as the second sliding hole 1031, and a plurality of first fixing holes are connected to the positioning plate 112. A spherical through hole is provided on the upper end of the bracket 111 near the movable plate 1029, and a contact with the movable plate 1031 is connected in the spherical through hole. 29, and the bracket 111 is also connected to a leaf spring that applies pressure to the steel ball, so that the steel ball is engaged with the positioning hole 10210 provided on the movable plate 1029 with a certain force. At the same time, a plurality of inclined positioning holes 10210 are also provided on the movable plate 1029. By providing the inclined positioning holes 10210, it is convenient to engage and it is also convenient to disengage the steel ball from the positioning holes 10210. When the steel ball is engaged with the positioning hole 10210 under the pressure of the leaf spring, the engaging effect can be improved. If it is to be moved again, the force required to be applied is greater than the engaging force of the steel ball with the positioning hole 10210, so that it can be moved out of the inclined positioning hole 10210 to achieve the positioning effect.

[0103] The movable plate 1029 is connected to a paddle 1022 extending to the second sliding hole 1031. The length of the paddle 1022 is smaller than the second sliding hole 1031. The paddle 1022 can move left and right in the second sliding hole 1031. The movable plate 1029 can be easily driven to move by the paddle 1022. At the same time, since the positioning plate 112 extends in the second sliding hole 1031 and the positioning plate 112 has the same length as the second sliding hole 1031, after the movable plate 1029 moves, the positioning plate 112 is fixed relative to the operation panel 103, and the positioning plate 112 is fixed relative to the operation panel 103. The plate 112 is movable relative to the movable plate 1029, so that the bracket 111 connected to the rear side of the positioning plate 112 slides on the movable plate 1029, so that the steel balls will be engaged in different positioning holes 10210 for positioning, thereby improving the connection effect. In addition, a second fixing hole corresponding to the first fixing hole is provided on the paddle 1022. When the paddle 1022 drives the movable plate 1029 to move to the specified position, the two fixing holes can be fixed by a padlock. When the state needs to be changed, the lock needs to be unlocked to move the movable plate 1029, thereby further improving the connection effect.

[0104] A push rod 1023 is connected to the interlocking baffle assembly 102, and the push rod 1023 can intermittently touch the second microswitch 108 as the interlocking baffle assembly 102 moves, thereby cutting off the closing circuit of the second microswitch 108 and controlling the opening and closing of the second microswitch 108. The second microswitch 108 is connected to the side wall of the operating panel 103. Therefore, when the interlocking baffle assembly 102 is driven to move by the paddle 1022, when the interlocking baffle assembly 102 moves to a specific position, it will trigger the second microswitch 108 to cut off the closing circuit, thereby realizing the electrical locking effect and meeting the requirement of the five protection requirements that the isolating switch cannot be operated under load.

[0105] The operation panel 103 is provided with an operation circular hole, and the movable plate 1029 is provided with an operation hole 1024 corresponding to the operation circular hole;

[0106] There are three positioning holes 10210. When the steel ball moves into the three positioning holes 10210, the corresponding paddle 1022 moves to the rightmost end, the middle end, and the leftmost end in the second sliding hole 1031, which correspond to the isolation operation position, the manual opening position, and the operating position, respectively.

[0107] Here's how it works:

[0108] When the paddle 1022 moves to the rightmost end of the second sliding hole 1031, the operating hole 1024 is aligned with the operating circular hole. In this position, the operating handle can be inserted to control the rotation of the isolating switch operating mechanism 2, thereby controlling the opening and closing of the isolating switch assembly 4. At the same time, the movable plate 1029 will trigger the second microswitch 108 to cut off the closing circuit, thereby achieving the electrical locking effect.

[0109] After completing the operation and pulling out the operating handle, the paddle 1022 can be moved to the manual opening position. At this time, the manual opening button 101 is reset. Electric opening and closing and manual opening operations can be performed in this position, but since the interlocking baffle assembly 102 has blocked the operating circular hole, the opening and closing operations of the disconnector cannot be performed, and there will be no erroneous operation of opening and closing the disconnector with load.

[0110] When the paddle 1022 moves to the operating position, the circuit breaker can be closed and enters the operating state. At this point, only electrically operated opening and closing operations can be performed; manual opening is not possible. The opening and closing state lever 3012 pushes the top plate 110 to indicate the circuit breaker status, and the operator makes the next decision based on the indication. In an emergency, if manual opening is required, the paddle 1022 must be moved to the manual opening position. In this position, the interlocking baffle assembly 102 blocks the operating hole, making it impossible to operate the disconnector. Each of the aforementioned positions can be locked with a padlock to ensure safe operation.

[0111] Based on the foregoing, the present invention realizes the system function by connecting the units to each other through the reasonable layout of the positions of each group of components. At the same time, it has the characteristics of compact and reasonable layout and perfect anti-error function. The use of mechanical DC circuit breaker in conjunction with the present invention will expand a new mode of DC power transmission.

[0112] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. An armored fixed indoor high voltage DC metal enclosed switchgear, characterized in that: The invention comprises a cabinet (5), a mechanism chamber (A) and a circuit breaker chamber (B) arranged side by side in the cabinet (5), and a cable chamber (C) arranged at the lower end of the circuit breaker chamber (B); An isolating switch assembly (4) is provided in the circuit breaker chamber (B), the isolating switch assembly (4) comprising two isolating switches for isolating the outgoing line side and the incoming line side, and the two isolating switches extend into the cable chamber (C) to connect corresponding cables; A vacuum circuit breaker assembly (3) is also connected between the mechanism chamber (A) and the circuit breaker chamber (B), and the vacuum circuit breaker assembly (3) includes a plurality of circuit breakers for controlling the opening and closing of different paths; The mechanism chamber (A) is provided with an isolating switch operating mechanism (2) connected to both the isolating switch assembly (4) and the vacuum circuit breaker assembly (3) for controlling the operation of the isolating switch assembly (4) and the vacuum circuit breaker assembly (3); An interlocking assembly (1) connected to both the isolating switch assembly (4) and the isolating switch operating mechanism (2) is provided in the mechanism chamber (A); the interlocking assembly (1) is used to control the operation of the vacuum circuit breaker assembly (3), display the state of the vacuum circuit breaker assembly (3), and intermittently isolate the isolating switch assembly (4); The isolating switch operating mechanism (2) comprises a rear clamping plate (202) and a front clamping plate (207) arranged in parallel and opposite to each other, and a plurality of support columns (203) arranged in a matrix and connecting the rear clamping plate (202) and the front clamping plate (207); The front splint (207) is movably connected to an active cam assembly, which is formed by connecting an operating shaft (213), an eccentric wheel (214) and an active cam (215). The operating shaft (213) is movably plugged into the front splint (207). The active cam (215) is connected to a side of the front splint (207) close to the rear splint (202), and the eccentric wheel (214) is fixedly sleeved between the front splint (207) and the active cam (215). A passive wheel (216) matching the active cam (215) is movably plugged into the rear splint (202), and two positioning grooves are provided on the side wall of the passive wheel (216). Positioning claws (217) for limiting the passive wheel (216) are intermittently plugged into the positioning grooves. The positioning claws (217) are connected between the rear splint (202) and the front splint (207) via a pin shaft (211) that is movably inserted through the positioning claws (217). One end of the pin shaft (211) that passes through the rear splint (202) is sleeved with a bent plate (209), and the other end of the bent plate (209) touches the first micro switch and controls the opening and closing of the first micro switch. The passive wheel (216) can automatically rotate along with the rotation of the active cam (215). The active cam (215) includes a protrusion and a plurality of active toothed recesses connected to the protrusion and distributed in a ring shape. The protrusion can intermittently push the positioning claw (217) to disengage the positioning claw (217) from the positioning groove. The passive wheel (216) is connected to a passive toothed recess corresponding to the active toothed recess. At the same time, there is an interval between the active toothed recess and the passive toothed recess. The driven wheel (216) passes through one end of the rear clamping plate (202) and is plugged with an output shaft, and an output crank arm (212) is sleeved on the output shaft. The output crank arm (212) is connected to the main shaft (406) of the isolating switch assembly (4) and controls the separation and connection of the isolating switch assembly (4); The positioning claw (217) is also fixedly connected to a torsion spring core sleeve (219) sleeved on the pin shaft (211), and a torsion spring (218) is sleeved on the torsion spring core sleeve (219). One end of the torsion spring (218) is fixed to the positioning claw (217), and the other end of the torsion spring (218) is fixed to the front clamping plate (207). The upper end of one side of the front clamping plate (207) is fixedly connected to a sliding sleeve mounting plate (205), the upper end of the sliding sleeve mounting plate (205) is connected to a sliding sleeve (204), a manual opening push rod assembly (107) can be inserted into the sliding sleeve (204), the manual opening push rod assembly (107) is connected to a circuit breaker manual opening crank arm (106), the circuit breaker manual opening crank arm (106) is connected to a manual opening shaft (3011) inserted into the upper end of the mechanism box (301), the rotation of the manual opening shaft (3011) can control the operation of the repulsive permanent magnet mechanism (3013), and the manual opening push rod assembly (107) is also connected to the interlocking assembly (1); The interlock assembly (1) comprises an operating panel (103), an interlock baffle assembly (102) capable of horizontal sliding is provided on the inner side of the operating panel (103), the interlock baffle assembly (102) comprises a movable plate (1029), at least two guide nuts (109) are connected to a side of the operating panel (103) close to the movable plate (1029), and the guide nuts (109) slide in guide holes (1028) horizontally provided on the movable plate (1029), a sliding top plate (110) is further connected to the operating panel (103), the top plate (110) is connected to the movable plate (1029), and as the movable plate (1029) drives the top plate (110) to move, the opening and closing state crank arm (3012) intermittently touches the top plate (110), thereby providing a mechanical indication of the state of the circuit breaker; The manual opening push rod assembly (107) is plugged into the operating panel (103), one end of the manual opening push rod assembly (107) passes through one end of the operating panel (103) and is connected to the manual opening button (101), the other end of the manual opening push rod assembly (107) passes through the sliding sleeve (204) and is connected to the guide shaft and the connecting nut (104), and a reset spring (105) is sleeved on a section of the guide shaft located between the manual opening crank arm (106) of the circuit breaker and the disconnector operating mechanism (2), and a slideway for facilitating the sliding of the guide shaft is further provided on the manual opening crank arm (106) of the circuit breaker, and the reset spring (105) is provided so that the manual opening push rod assembly (107) can be telescopically adjusted after being pressed; The manual separation push rod assembly (107) includes a front boss, a recessed portion, a rear boss, and a manual separation connecting rod connected to each other, forming a stepped structure, and the thickness of each step is different. At the same time, a narrow groove (1025), a round groove (1026), and a wide groove (1027) connected to each other are provided on the movable plate (1029). The width of the recessed portion is the same as the thickness of the movable plate (1029). A pad (1021) is connected to the movable plate (1029) along the circumference of the wide groove (1027) to increase the thickness of the wide groove (1027) and to limit the movement of the recessed portion into the wide groove (1027). The movable plate (1029) is provided with a first sliding hole (10211), a bracket (111) is slidably connected in the first sliding hole (10211), the bracket (111) slides in the first sliding hole (10211) through a slider connected thereto, one end of the slider passing through the first sliding hole (10211) is connected to a positioning plate (112), and the positioning plate (112) extends to a second sliding hole (1031) provided on the operating panel (103), and the positioning plate (112) and the second sliding hole (1031) are connected. The lengths are the same, and a plurality of first fixing holes are connected to the positioning plate (112). A spherical through hole is provided at the upper end of the bracket (111) close to the movable plate (1029), and a steel ball that contacts the movable plate (1029) is connected to the spherical through hole. At the same time, a leaf spring that applies pressure to the steel ball is connected to the bracket (111), so that the steel ball is engaged with the positioning hole (10210) opened on the movable plate (1029) with a certain force. At the same time, a plurality of inclined positioning holes (10210) are also provided on the movable plate (1029); The movable plate (1029) is connected to a paddle (1022) extending to the second sliding hole (1031); the length of the paddle (1022) is smaller than the second sliding hole (1031); and the paddle (1022) can move left and right in the second sliding hole (1031); The operating panel (103) is provided with an operating circular hole for convenient insertion of an operating handle, and the movable plate (1029) is provided with an operating hole (1024) corresponding to the operating circular hole.

2. The armored fixed indoor high-voltage DC metal-enclosed switchgear according to claim 1, characterized in that: The cabinet (5) is further provided with a high-voltage capacitor chamber (D), a low-voltage capacitor chamber (E), and an instrument chamber (F), and the mechanism chamber (A), the cable chamber (C), the circuit breaker chamber (B), the high-voltage capacitor chamber (D), the low-voltage capacitor chamber (E), and the instrument chamber (F) in the cabinet (5) are distributed counterclockwise; The high-voltage capacitor chamber (D) and the low-voltage capacitor chamber (E) are arranged side by side and located above the circuit breaker chamber (B). The instrument chamber (F) is located above the mechanism chamber (A). A rectifier and a capacitor charger are installed inside the instrument chamber (F). A pressure relief channel is designed at the rear of the cabinet. Pressure from a failure of each functional unit is released backward and then discharged upward along the channel to ensure the personal safety of people behind the cabinet. The high-voltage capacitor in the high-voltage capacitor chamber (D) is mounted upside down, and the terminals on the high-voltage capacitor extend into the circuit breaker chamber (B).

3. The armored fixed indoor high-voltage DC metal-enclosed switchgear according to claim 2, characterized in that: A sealing plate partition is provided between the circuit breaker chamber (B) and the mechanism chamber (A), and an observation window is provided on the sealing plate partition for observing the status of the electrical components in the high-voltage chamber. The high-voltage capacitor chamber (D), the low-voltage capacitor chamber (E) and the circuit breaker chamber (B) are all closed compartments formed by partitions.

4. The armored fixed indoor high-voltage DC metal-enclosed switchgear according to claim 1, characterized in that: The vacuum circuit breaker assembly (3) comprises a mechanism box (301) arranged in a mechanism chamber (A), and a commutation circuit breaker (303), a main circuit breaker (304), and a charging circuit breaker (305) arranged in a circuit breaker chamber (B); a repulsive permanent magnet mechanism (3013) is arranged in the mechanism box (301) for controlling the opening and closing of the commutation circuit breaker (303), the main circuit breaker (304), and the charging circuit breaker (305) in the circuit breaker chamber (B); The lower ends of the commutation circuit breaker (303), the main circuit breaker (304) and the charging circuit breaker (305) are connected to the same chassis (302). A pull rod (3021) is provided in the chassis (302). The pull rod (3021) is connected to the drive shaft of the repulsive permanent magnet mechanism (3013). At the same time, the pull rod (3021) also controls the connection of the commutation circuit breaker transmission bracket (3031), the main circuit breaker transmission bracket (3041) and the charging circuit breaker transmission bracket (3051). The commutation circuit breaker transmission bracket (3031), the main circuit breaker transmission bracket (3041) and the charging circuit breaker transmission bracket (3051) respectively control the opening and closing of the commutation circuit breaker (303), the main circuit breaker (304) and the charging circuit breaker (3051).

5. The armored fixed indoor high-voltage DC metal-enclosed switchgear according to claim 4, characterized in that: A manual trip shaft (3011) is plugged into the upper end of the mechanism box (301), and the rotation of the manual trip shaft (3011) can control the operation of the repulsive permanent magnet mechanism (3013). At the same time, a trip state crank arm (3012) connected to the output shaft of the repulsive permanent magnet mechanism (3013) is plugged into the side wall of the mechanism box (301) for outputting the trip state of the repulsive permanent magnet mechanism (3013).

6. The armored fixed indoor high-voltage DC metal-enclosed switchgear according to claim 1, characterized in that: The isolating switch assembly (4) includes a base frame (404), on which two groups of single-stage isolating switches are arranged, each consisting of a wall bushing (402), a support insulator (403) and a pull rod insulator (410), the two groups of isolating switches respectively controlling incoming line isolation and outgoing line isolation, and a grounding bracket (401) for grounding is arranged on the base frame (404); The two isolating switches are connected to a same main shaft (406), one end of the pull rod insulator (410) is hinged on the main shaft (406) through a connecting rod, and the lower end of the pull rod insulator (410) is hinged with a contact knife (412). As the main shaft (406) is installed, the connecting rod can be driven to rotate, and the pull rod insulator (410) is driven to rotate through the connecting rod. One end of the contact knife (412) is hinged to the lower end of the wall bushing (402), and the other end of the contact knife (412) intermittently contacts the moving contact (408) on the support insulator (403) as the pull rod insulator (410) rotates, thereby realizing opening and closing. The main shaft (406) is connected to a grounding shaft (411) through a crank structure formed by a linkage crank arm (405) and a linkage plate (409). The grounding shaft (411) is movably plugged into the base frame (404). Two grounding knives (407) corresponding to the isolating switches are connected to the grounding shaft (411). The movable end of the grounding knife (407) is intermittently connected to a grounding contact (413) connected to the lower end of the wall bushing (402) as the grounding shaft (411) rotates, thereby controlling intermittent grounding. The structures of the main shaft (406), the linkage crank arm (405) and the linkage plate (409) are such that the movement directions of the contact knife (412) and the grounding knife (407) are always opposite.

7. The armored fixed indoor high-voltage DC metal-enclosed switchgear according to claim 1, characterized in that: The base frame (404) of the isolating switch assembly (4) and the bottom surfaces of the plurality of circuit breakers are sealed by a metal sealing plate.

8. The armored fixed indoor high-voltage DC metal-enclosed switchgear according to claim 1, characterized in that: The number of the positioning holes (10210) is three, and when the corresponding paddle (1022) moves to the rightmost end, the middle end and the leftmost end in the second sliding hole (1031), they correspond to the isolation operation position, the manual opening position and the operating position respectively.

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