Universal grounding trolley circuit breaker for centrally installed switchgear

Abstract

The invention provides a universal grounding trolley circuit breaker for a centrally installed switchgear, and effectively solves the problems that the whole maintenance working process is tedious, the labor cost and time investment are relatively large and the maintenance efficiency is relatively low due to the lack of uniformity of a circuit breaker of an existing grounding trolley. According to the technical scheme, the grounding handcart comprises a circuit breaker of the grounding handcart, and the circuit breaker comprises a retractable door, a locking shielding plate control module and a support used for installing a moving contact. The right side of the support is provided with a grounding copper bar which is fixed together through a plurality of insulation lightning arresters. A moving contact lifting module and a moving contact phase distance control module are arranged on the bracket; the moving contact lifting module comprises a plurality of lead screw nut mechanisms, nuts are fixed on the bracket, and lead screws are mounted on the retractable door; the grounding trolley is ingenious in structure and multipurpose, the grounding trolley is standardized, the number of spare parts needing to be configured is reduced, the overhaul operation process is optimized, the labor cost and time investment are reduced, and the maintenance and repair cost is reduced; and safe operation stability of a power grid is improved.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers for electric power equipment, in particular to a universal grounding trolley circuit breaker for a central cabinet. Background Art

[0002] KYN28-12 center cabinets have been widely used in power substations and other industrial and mining enterprises and residential distribution rooms. The center cabinets are characterized by convenient trolley-type switchgear and are very popular among users. According to the experience of using KYN28 cabinets, the current PT cabinet widths are mainly 800mm and 1000mm. The other two cabinets with different widths have different static contact phase spacings, and the static contact phase spacings are slightly different according to different needs. Due to the above reasons, in the maintenance process, it is necessary to equip grounding circuit breaker trolleys of separate sizes according to different cabinet sizes and specifications. The lack of uniformity and standardization makes the entire maintenance process more cumbersome, which invisibly increases the manpower cost and time investment of substation operation and maintenance personnel and maintenance personnel. It is also necessary to maintain and service each trolley at the time, and the maintenance efficiency is low.

[0003] After searching, it is found that the circuit breaker trolleys in the prior art are all of fixed size and matched with fixed cabinets, represented by an intelligent circuit breaker trolley disclosed in patent document CN110223880B and a 10kV switch cabinet type circuit breaker disconnecting auxiliary device disclosed in CN112349523A. When in use, they can only correspond to cabinets of special styles, are not universal, and are not standardized, and cannot solve the above-mentioned problems faced by the present invention.

[0004] A universal grounding trolley circuit breaker for a center cabinet is now provided to solve the above problems. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a universal grounding trolley circuit breaker for a central cabinet, which effectively solves the problem that the circuit breakers of the existing grounding trolleys lack uniformity and insufficient standardization, resulting in the entire maintenance process being more cumbersome, with high labor costs and time investment, and low maintenance efficiency.

[0006] The technical solution is a circuit breaker including a grounding trolley, the circuit breaker including a telescopic door, a locking shutter control module, and a bracket for mounting a moving contact; There is a grounding copper bar on the right side of the bracket, and the grounding copper bar is fixed together through multiple insulating lightning arresters; a moving contact lifting module and a moving contact phase spacing control module are installed on the bracket; The moving contact lifting module comprises a plurality of vertically arranged lead screw and nut mechanisms, wherein the nut is fixed on the bracket and the lead screw is rotatably mounted on the telescopic door; when the plurality of lead screws rotate simultaneously, the plurality of nuts can drive the bracket to move up and down; The moving contact phase spacing control module comprises three moving contacts a, b and c on the same horizontal line, and there are three worm gear mechanisms corresponding to the moving contacts one by one on the bracket, and the three worm gears are coaxially and rotatably mounted on the bracket; wherein the threads on the worm gears corresponding to a and c have opposite rotation directions, and the two worm gears are both fixed with discs, the discs are made of insulating materials, the left ends of the moving contacts a and c are eccentrically fixed on the discs, and the discs are inserted with electric cores; a cam is fixed on the worm gear corresponding to the b phase, and there is a slider that can move up and down on the upper side of the cam, the slider is made of insulating materials, and there is an electric core in the slider; the electric core and the grounding wire are softly connected with a copper busbar; when the three worm gears drive their respective worm gears to rotate at the same time, the phase spacing of the three moving contacts changes, and the three moving contacts remain on the same horizontal plane.

[0007] Preferably, the grounding copper busbar and the grounding wire of the circuit breaker are softly connected using a copper busbar.

[0008] Preferably, the telescopic door includes a hollow fixed plate, with a movable plate at both ends of the fixed plate cavity, guide rods arranged in the front and rear directions are fixed in the fixed plate cavity, the movable plate can slide forward and backward along the guide rods, and the guide rods are provided with compression springs, which can push the two movable plates to the side away from each other; positioning pins are provided on the fixed plate, and a plurality of positioning holes are provided on the movable plate, and the positioning pins and the positioning holes can fix the movable plate in cooperation.

[0009] Preferably, the locking shutter control module is composed of two U-shaped plates, and the two U-shaped plates are fixed together at right angles; one side of the locking shutter control module is hinged to the front and rear side plates of the circuit breaker.

[0010] Preferably, a long box corresponding to the screw is fixed on the inner side of the fixed plate, the screw is in the long box, and the screw is installed on the fixed plate via the long box; a driven wheel is fixed to the lower end of each screw, and a rotating shaft arranged along the front-to-back direction is provided on the inner side of the fixed plate, the rotating shaft is rotatably installed on the fixed plate, and a driving wheel corresponding to the driven wheel is provided on the rotating shaft. When the rotating shaft drives the corresponding driven wheels at the same time through two driving wheels, the two screws rotate at the same time, thereby realizing the lifting and lowering of the bracket.

[0011] Preferably, a vertical rod is fixed to the upper end of the slider, the upper end of the vertical rod passes through the upper side plate of the bracket, and a compression spring is arranged between the slider and the upper side plate of the bracket; when the cam rotates, the cam can drive the slider to move up and down, thereby realizing the up and down movement of the b-phase moving contact.

[0012] Preferably, the battery cell adopts an embedded installation structure, the disc is provided with pits corresponding to the battery cell thereon, and the battery cell is embedded in the disc.

[0013] Preferably, the static contact includes a contact arm and a plum blossom contact at its right end; the contact arm includes an upper arm, a lower arm and a connecting arm, and the plum blossom contact is installed on the lower arm; the upper arm and the lower arm are connected via the connecting arm, wherein the left end of the connecting arm and the upper arm are connected by a ball joint, and the right end of the connecting arm and the lower arm are connected by a ball joint; a plurality of elastic rods are connected between the upper arm and the lower arm, and the ends of the elastic rods are also connected to the upper arm or the lower arm in the form of a ball joint, so that the upper arm, the lower arm and the plurality of elastic rods form a parallelogram mechanism, so that the upper arm and the lower arm always remain parallel.

[0014] The present invention has an ingenious structure, one vehicle for multiple uses, and a standardized grounding trolley, which reduces the number of spare parts required, can optimize the maintenance operation process, reduce the manpower cost and time investment of substation operation and maintenance personnel, and reduce the maintenance and repair costs required for the vehicle; it greatly improves the maintenance operation efficiency, eliminates hidden dangers of operating equipment in a timely manner, and is conducive to improving the safe operation and stability of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front cross-sectional view of the present invention.

[0016] Figure 2 The overall structure of the present invention Figure 1 (Inspect the status of a 1000mm width cabinet).

[0017] Figure 3 It is a left view of the present invention.

[0018] Figure 4 It is the right view of the present invention.

[0019] Figure 5 The figure is a schematic diagram of the installation relationship between the two movable plates and the guide rods in the present invention.

[0020] Figure 6 It is a structural diagram of the locking shutter control module in the present invention.

[0021] Figure 7 It is a structural schematic diagram of the bracket and the moving contact lifting module and the moving contact phase spacing control module thereon in the present invention.

[0022] Figure 8 The structure of the moving contact phase spacing control module in the present invention is shown in FIG. Figure 1 .

[0023] Fig. 9 The structure of the moving contact phase spacing control module in the present invention is shown in FIG. Figure 2 .

[0024] Fig.10 It is a schematic diagram of the structure of the disc, the battery cell and the contact arm in the present invention.

[0025] Fig.11It is a cross-sectional view of the disc, the battery cell and the contact arm in the present invention.

[0026] Fig.12 It is a structural diagram of the battery cell in the present invention.

[0027] Fig.13 The overall structure of the present invention Figure 2 (Inspect the status of the 800mm width cabinet). DETAILED DESCRIPTION

[0028] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0029] Depend on Figures 1 to 13 The present invention includes a circuit breaker 1 for a grounding trolley, the circuit breaker 1 includes a telescopic door 2, a locking shutter control module 3, and a bracket 4 for mounting a moving contact; like Figure 1 , 2 As shown in , 7, and 13, there is a grounding copper bar 5 on the right side of the bracket 4, and the grounding copper bar 5 is fixed together through multiple insulating lightning arresters 6; a moving contact lifting module and a moving contact phase spacing control module are installed on the bracket 4; like Figure 1 , 2 As shown in , 7 and 13, the moving contact lifting module comprises a plurality of vertically arranged lead screw 7 and nut 8 mechanisms, wherein the nut 8 is fixed on the bracket 4, and the lead screw 7 is rotatably mounted on the telescopic door 2; when the plurality of lead screws 7 rotate simultaneously, the plurality of nuts 8 can drive the bracket 4 to move up and down; like Figure 7 , 8 As shown in Figure 9, the moving contact phase spacing control module includes three moving contacts a, b, and c on the same horizontal line. There are three worm gears 9 and worm 10 mechanisms corresponding to the moving contacts on the bracket 4, and the three worm gears 10 are coaxial and rotatably mounted on the bracket 4; the threads on the worm gears 10 corresponding to a and c are opposite in direction, and a disc 11 is fixed on both worm gears 9, and the disc 11 is made of insulating material. The left ends of the moving contacts a and c are eccentrically fixed on the disc 11, and a battery cell 12 is inserted in the disc 11; a cam 13 is fixed on the worm gear 9 corresponding to the b phase, and a slider 14 that can move up and down is provided on the upper side of the cam 13, and the slider 14 is made of insulating material, and the slider 14 contains the battery cell 12; the battery cell 12 and the grounding wire are connected with a copper busbar 15; when the three worm gears 10 drive their respective worm gears 9 to rotate at the same time, the phase spacing of the three moving contacts changes, and the three moving contacts remain on the same horizontal plane.

[0030] like Figure 2 , 13As shown, in order to realize that the grounding copper bar 5 and the grounding wire of the circuit breaker 1 are energized without affecting the grounding copper bar 5 to move up and down with the bracket 4, the grounding copper bar 5 and the grounding wire of the circuit breaker 1 are connected by a copper bar soft connection 15.

[0031] like Figure 5 As shown, in order to adapt to cabinets of different widths, the telescopic door 2 includes a hollow fixed plate 16, and a movable plate 17 is provided at both front and rear ends of the fixed plate 16 cavity. A guide rod 18 arranged in the front and rear directions is fixed in the fixed plate 16 cavity, and the movable plate 17 can slide forward and backward along the guide rod 18. The guide rod 18 is provided with a compression spring, which can push the two movable plates 17 to the side away from each other; a positioning pin 19 is provided on the fixed plate 16, and a plurality of positioning holes 20 are provided on the movable plate 17. The positioning pin 19 cooperates with the positioning hole 20 to fix the movable plate 17.

[0032] like Figure 2 , 6 As shown in FIG. 13 , in order to match different cabinets while being able to trigger the locking shutters in different cabinets, the locking shutter control module 3 is composed of two U-shaped plates 21, and the two U-shaped plates 21 are fixed together at right angles; one side of the locking shutter control module 3 is hinged on the front and rear side panels of the circuit breaker 1.

[0033] like Figure 2 , 7 As shown, in order to install the lead screw 7, a long box 22 corresponding to the lead screw 7 is fixed on the inner side of the fixed plate 16, the lead screw 7 is in the long box 22, and the lead screw 7 is installed on the fixed plate 16 via the long box 22; a driven wheel 23 is fixed to the lower end of each lead screw 7, and a rotating shaft 24 arranged along the front-to-back direction is provided on the inner side of the fixed plate 16, and the rotating shaft 24 is rotatably installed on the fixed plate 16, and a driving wheel 25 corresponding to the driven wheel 23 is provided on the rotating shaft 24. When the rotating shaft 24 drives the corresponding driven wheel 23 at the same time through two driving wheels 25, the two lead screws 7 are rotated at the same time, thereby realizing the lifting and lowering of the bracket 4.

[0034] like Figure 2 , 7 As shown, in order to realize the up and down movement of the slider 14, a vertical rod 26 is fixed to the upper end of the slider 14, and the upper end of the vertical rod 26 passes through the upper side plate of the bracket 4. There is a compression spring between the slider 14 and the upper side plate of the bracket 4; when the cam 13 rotates, the cam 13 can drive the slider 14 to move up and down, realizing the up and down movement of the b-phase moving contact.

[0035] In order to prevent leakage, the battery cell 12 adopts an embedded installation structure, and the disc 11 is provided with pits corresponding to the battery cell 12 thereon, and the battery cell 12 is embedded in the disc 11.

[0036] like Figure 1 , 2As shown in Figures 7, 8, 9, 10, 11 and 13, in order to keep the moving and static contacts in good contact, the moving contact includes a contact arm and a plum blossom contact 27 at its right end; the contact arm includes a large arm 28, a small arm 29 and a connecting arm 30, and the plum blossom contact 27 is installed on the small arm 29; the large arm 28 and the small arm 29 are connected via the connecting arm 30, wherein the left end of the connecting arm 30 and the large arm 28 are connected by a ball joint, and the right end of the connecting arm 30 and the small arm 29 are connected by a ball joint; a plurality of elastic rods 31 are connected between the large arm 28 and the small arm 29, and the ends of the elastic rods 31 are also connected to the large arm 28 or the small arm 29 in the form of a ball joint, so that the large arm 28, the small arm 29 and the plurality of elastic rods 31 form a parallelogram mechanism, so that the large arm 28 and the small arm 29 always remain parallel.

[0037] like Fig.11 As shown, the elastic rod 31 refers to a rod-shaped object with a certain deformation ability and can restore its original shape, such as an insulating rubber rod, an insulating spring telescopic rod, etc., but the tightness of the connection between the upper arm 28, the lower arm 29, and the connecting rod must be ensured to ensure reliable conductivity. If necessary, conductive paste or alum can be applied as an aid.

[0038] It is worth noting that the rotating shaft 24 or the worm 10 in the above embodiments are all rotated manually. In the current era of popularization of intelligence, ordinary technicians in this field can achieve the above-mentioned automatic operation through programming or logic controller, but this is not the core of the present invention and will not be repeated again.

[0039] Similarly, if programming or logic control, auxiliary sensors, etc. are used between the modules in the present invention, the user experience can be greatly improved. For example, when inspecting a cabinet with a width of 1000 mm, the movable plate 17 needs to extend from both sides of the fixed plate 16, and the movable shutter trigger module should be flipped 90° to the side away from the side wall of the isolator, as shown in FIG. Figure 2 When inspecting a cabinet with a width of 800 mm, the movable plate 17 needs to be retracted in the cavity of the fixed plate 16, and the locking shutter control module 3 should be retracted upwards, as shown in FIG. Fig.13 According to this logic, sensors or electric push rods can be respectively provided on the movable plate 17 and the locking shutter control module 3 to realize the linkage between the two.

[0040] The two movable plates 17 in the present invention can be controlled in a variety of ways. The above-mentioned method uses a guide rod 18, a spring, and a positioning pin 19. The reason for adopting this method is that most of the kyn28 center cabinets on the market have only two sizes of 800mm and 1000mm. The use of the above-mentioned simple positioning pin 19 obviously has a cost advantage. In addition, a logic circuit can also be used to control the electric push rod.

[0041] The distance between the three-phase moving contacts of the present invention, abc, is controlled by the moving contact phase spacing control module, wherein the rotation directions of the threads on the worm 10 corresponding to the two items a and c are opposite, so that when the worm 10 rotates at the same time, the rotation directions of the worm wheels 9 on the a and c phases are opposite, so that the distance between adjacent moving contacts is adjusted. For the convenience of explanation, on this basis, it is assumed that when the distance between the a and c phases is the farthest, it is the starting point, at which time the slider 14 where the moving contact of the b phase is located is at the farthest point of the cam 13; at the same time, it is assumed that when the distance between the a and c phases is the closest, it is the end point, at which time the slider 14 where the moving contact of the b phase is located is at the closest point of the cam 13; it is assumed that the thread leads on the three worms 10 are consistent, and the diameters of the worm wheels 9 corresponding to the moving contacts of the a and c phases are twice the diameters of the worm wheels 9 corresponding to the b phase; so that when the worm wheels 9 corresponding to the moving contacts of the a and c phases rotate 180°, the worm wheel 9 corresponding to the moving contact of the b phase rotates one circle.

[0042] When in use, when the interval between the moving contacts needs to be adjusted, the three worms 10 are rotated to make the three worm wheels 9 rotate simultaneously, and the two discs 11 drive the two-phase moving contacts a and c to rotate downward, and the interval between the three-phase moving contacts a, b, and c gradually decreases, so as to adjust the interval between the moving contacts. If the height of the moving contact needs to be adjusted, the two driving wheels 25 on the rotating shaft 24 drive the two lead screws 7 to rotate simultaneously, so as to realize the up and down movement of the entire bracket 4 and the lifting and lowering of the moving contact; when different cabinets need to be repaired, the extension amount of the movable plate 17 can be adjusted to adapt to cabinets of different widths, and the locking shutter control module 3 can be adjusted to be retracted and lowered to trigger the opening and closing of the locking shutters in different cabinets, so that the moving and static contacts can be normally plugged in. In the present invention, the traditional fixed single trigger element (similar in shape to the U-shaped plate 21 in the present invention) is replaced with two fixed at right angles, and protrusions are set on both sides of the U-shaped plate 21, which is similar to the traditional method, ensuring that the opening and closing of the locking shutter can be triggered.

[0043] Since the present invention is adapted to the static contacts of different spacings in different cabinets, compared with the relatively standard production model of the cabinet width, the distance between the static contacts in different cabinets does not have a clear or obvious model, and the tolerance is large in production, deformation caused in later use, etc., so it is necessary for the moving contact to be able to perform adaptive adjustment in a small range. In this regard, the present invention splits the traditional contact arm into three parts: a large arm 28, a connecting arm 30, and a small arm 29, wherein the connecting arm 30 exists as a conductive part, and multiple elastic rods 31 between the large arm 28 and the small arm 29 form a parallelogram mechanism, which can also ensure that the small arm 29 moves within a certain range, making the plug-in structure between the moving and static contacts more reliable.

[0044] Written at the end of this article, but still important, and also the inventor needs to emphasize that the present invention adopts a worm gear mechanism and a cam mechanism to realize the horizontal and vertical movement of the three-phase moving contacts of abc, and at the same time ensures that the three moving contacts are always on the same horizontal line, which belongs to reliable mechanical linkage. According to conventional mechanical design ideas, it seems simpler and more indirect to use horizontal and vertical electric cylinders to drive the moving contacts to move, and it is also easy to implement. However, there are special reasons for the switch cabinet operators as high-risk industries. Although it seems simple to drive the moving contacts to move by electric cylinders, the failure rate is also high and it is not reliable. Electrical signals or laser signals are required to check the up and down and left and right positions of the moving contacts, and feedback is also required at all times, which itself increases the difficulty of operation and implementation. Considering safety and convenience, this simple and rough method is based on sacrificing the safety of the operator, which can easily cause major accidents. This idea is also reflected in other mechanisms on the circuit breaker trolley, including but not limited to the closing mechanism, energy storage mechanism, opening electric control mechanism, etc., all of which adopt more reliable mechanical linkage, and the electric control only provides kinetic energy for the above mechanisms. In short, everything serves safety.

Claims

1. A universal grounding trolley circuit breaker for a central cabinet, characterized in that: A circuit breaker (1) comprising a grounding trolley, the circuit breaker (1) comprising a telescopic door (2), a locking shutter control module (3), and a bracket (4) for mounting a moving contact; A grounding copper bar (5) is provided on the right side of the bracket (4), and the grounding copper bar (5) is fixed together via a plurality of insulating lightning arresters (6); a moving contact lifting module and a moving contact phase spacing control module are installed on the bracket (4); The movable contact lifting module comprises a plurality of vertically arranged lead screw (7) and nut (8) mechanisms, wherein the nut (8) is fixed on the bracket (4), and the lead screw (7) is rotatably mounted on the telescopic door (2); when the plurality of lead screws (7) rotate simultaneously, the plurality of nuts (8) can drive the bracket (4) to move up and down.

2. A universal grounding trolley circuit breaker for a central cabinet according to claim 1, characterized in that: The moving contact phase spacing control module comprises three moving contacts a, b and c located on the same horizontal line, and a bracket (4) is provided with three worm gear (9) and worm (10) mechanisms corresponding to the moving contacts one by one, and the three worm gears (10) are coaxially and rotatably mounted on the bracket (4); wherein the threads on the worm gears (10) corresponding to a and c have opposite rotation directions, and a disk (11) is fixed on both worm gears (9), and the disk (11) is made of insulating material, and the left ends of the moving contacts a and c are eccentrically fixed on the disk (11). , a battery cell (12) is inserted in the disc (11); a cam (13) is fixed on the worm wheel (9) corresponding to the b phase, a slider (14) that can move up and down is provided on the upper side of the cam (13), the slider (14) is made of insulating material, and the battery cell (12) is contained in the slider (14); the battery cell (12) and the grounding wire are connected by a copper busbar (15); when the three worms (10) drive their respective worm wheels (9) to rotate at the same time, the phase spacing of the three moving contacts changes, and the three moving contacts are kept on the same horizontal plane.

3. A universal grounding trolley circuit breaker for a central cabinet according to claim 1, characterized in that: The grounding copper bar (5) and the grounding wire of the circuit breaker (1) are connected by a copper bar soft connection (15).

4. A universal grounding trolley circuit breaker for a central cabinet according to claim 1, characterized in that: The telescopic door (2) comprises a hollow fixed plate (16), wherein a movable plate (17) is provided at both the front and rear ends of the cavity of the fixed plate (16), a guide rod (18) arranged in the front-rear direction is fixed in the cavity of the fixed plate (16), the movable plate (17) can slide forward and backward along the guide rod (18), and a compression spring is sleeved on the guide rod (18), and the compression spring can push the two movable plates (17) to a side away from each other; a positioning pin (19) is provided on the fixed plate (16), and a plurality of positioning holes (20) are provided on the movable plate (17), and the positioning pin (19) cooperates with the positioning holes (20) to fix the movable plate (17).

5. The universal grounding trolley circuit breaker for a central cabinet according to claim 1 is characterized in that: The locking shutter control module (3) is composed of two U-shaped plates (21), and the two U-shaped plates (21) are fixed together at a right angle; one side of the locking shutter control module (3) is hinged to the front and rear side plates of the circuit breaker (1).

6. A universal grounding trolley circuit breaker for a central cabinet according to claim 4, characterized in that: A strip box (22) corresponding to the lead screw (7) is fixed on the inner side of the fixed plate (16), the lead screw (7) is in the strip box (22), and the lead screw (7) is mounted on the fixed plate (16) via the strip box (22); a driven wheel (23) is fixed to the lower end of each lead screw (7), a rotating shaft (24) arranged along the front-rear direction is provided on the inner side of the fixed plate (16), the rotating shaft (24) is rotatably mounted on the fixed plate (16), and a driving wheel (25) corresponding to the driven wheel (23) is provided on the rotating shaft (24); when the rotating shaft (24) drives the corresponding driven wheel (23) simultaneously via the two driving wheels (25), the two lead screws (7) are rotated simultaneously, thereby realizing the lifting and lowering of the bracket (4).

7. A universal grounding trolley circuit breaker for a central cabinet according to claim 2, characterized in that: A vertical rod (26) is fixed to the upper end of the slider (14), the upper end of the vertical rod (26) passes through the upper side plate of the bracket (4), and a compression spring is provided between the slider (14) and the upper side plate of the bracket (4); when the cam (13) rotates, the cam (13) can drive the slider (14) to move up and down, thereby realizing the up and down movement of the b-phase moving contact.

8. A universal grounding trolley circuit breaker for a central cabinet according to claim 2 or 7, characterized in that: The battery cell (12) adopts an embedded installation structure; a recess corresponding to the battery cell (12) thereon is provided on the disc (11); and the battery cell (12) is embedded in the disc (11).

9. A universal grounding trolley circuit breaker for a central cabinet according to any one of claims 1 to 7, characterized in that: The movable contact comprises a contact arm and a plum blossom contact (27) at its right end; the contact arm comprises a large arm (28), a small arm (29) and a connecting arm (30), wherein the plum blossom contact (27) is mounted on the small arm (29); the large arm (28) and the small arm (29) are connected via the connecting arm (30), wherein the left end of the connecting arm (30) and the large arm (28) are connected by a ball joint, and the right end of the connecting arm (30) and the small arm (29) are connected by a ball joint; a plurality of elastic rods (31) are connected between the large arm (28) and the small arm (29), and the ends of the elastic rods (31) are also connected to the large arm (28) or the small arm (29) by a ball joint, so that the large arm (28), the small arm (29) and the plurality of elastic rods (31) form a parallelogram mechanism, so that the large arm (28) and the small arm (29) always remain parallel.

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