Rapid switching operation structure for secondary circuit of current transformer

Abstract

The utility model relates to the technical field of current transformers, and discloses a current transformer secondary circuit rapid switching operation structure, which comprises a bottom plate, a plurality of protection joints fixedly connected to one side of the top surface of the bottom plate, and a plurality of grounding joints fixedly connected to the other side of the top surface of the bottom plate, each mounting frame is provided with an electric switching assembly, the side walls of the two electric switching assemblies are jointly and fixedly connected with a connecting seat, the side walls of the two sides of the connecting seat are fixedly connected with a plurality of disconnecting links, and the positions, corresponding to the disconnecting links, of the top surface of the bottom plate are fixedly connected with a plurality of insulating blocks; a limiting switching assembly is slidably arranged on the top face of the mounting frame in a penetrating mode, and a pushing handle is fixedly connected to the top face of the connecting base. According to the utility model, the limiting switching assembly is arranged, so that mistaken touch is avoided, rapid switching operation is facilitated, and the electric switching assembly is arranged to control the micro electric push rod to realize remote switching.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, in particular to a secondary circuit fast switching operation structure of a current transformer. Background Art

[0002] The current transformer is composed of a closed iron core and windings. Its primary winding has very few turns and is connected in series in the circuit of the current that needs to be measured. The secondary winding has relatively many turns and is connected in series in the measuring instrument and protection circuit. When the current transformer is working, its secondary circuit is always closed. When performing maintenance work, it is necessary to short-circuit the corresponding current transformer secondary current circuit by switching components to isolate the maintenance equipment from the current circuit of the operating equipment.

[0003] For example, a current transformer secondary circuit fast switching operation structure with publication number CN210514548U includes a base, a two-way switching knife switch, a knife switch connection static contact connected to the current transformer secondary circuit, and a protection static contact and a current secondary circuit short-circuit grounding static contact arranged on the left and right sides of the knife switch connection static contact respectively; the two-way switching knife switch is connected to the knife switch connection static contact, and can be rotated in two directions to the left or right to achieve closing with different static contacts; an interlocking lock is provided between the two-way switching knife switch and the base, and when the two-way switching knife switch is switched to contact with the protection static contact for closing, the lock locks so that the switching operation handle will be pulled open by mistake. It can avoid the current secondary circuit open circuit accident and improve the circuit switching efficiency.

[0004] There are still some shortcomings in the above patent, such as: switching is performed by rotating the two-way switching knife switch, and the staff needs to manually operate on site during switching, and remote switching operation is not possible; the locking plates and the holes are used for limiting, and the two locking plates need to be pressed down during operation to disengage them from the buckle holes, which makes it inconvenient for maintenance personnel to operate with both hands when carrying tools for maintenance.

[0005] Therefore, we propose a fast switching operation structure for the secondary circuit of a current transformer to solve the above problems. Summary of the invention

[0006] The purpose of the utility model is to provide a rapid switching operation structure for the secondary circuit of a current transformer, so as to solve the problem proposed in the above-mentioned background technology that switching is performed by rotating a two-way switching knife switch, and manual operation is required on site by staff during switching, and remote switching operation cannot be performed; limiting is performed by locking plates and holes, and during operation, the two locking plates need to be pressed down to disengage them from the buckle holes, and it is inconvenient for maintenance personnel to operate with both hands when carrying tools for maintenance.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a current transformer secondary circuit rapid switching operation structure, comprising a base plate, a plurality of protective joints fixedly connected to one side of the top surface of the base plate and a plurality of grounding joints fixedly connected to the other side of the top surface of the base plate, a mounting frame symmetrically fixedly connected to the top surface of the base plate, an electric switching assembly is arranged on each of the mounting frames, a connecting seat is commonly fixedly connected to the side walls of the two electric switching assemblies, a plurality of knife switches are fixedly connected to the side walls on both sides of the connecting seat, a plurality of insulating blocks are fixedly connected to the positions corresponding to the plurality of knife switches on the top surface of the base plate, each of the knife switches is slidably connected to the corresponding insulating block, a limited position switching assembly is slidably arranged on the top surface of the mounting frame, and a push handle is fixedly connected to the top surface of the connecting seat.

[0008] Preferably, a plurality of protection terminals are fixedly connected to positions corresponding to the plurality of protection joints on the bottom surface of the base plate, a plurality of grounding terminals are fixedly connected to positions corresponding to the plurality of grounding joints on the bottom surface of the base plate, and a plurality of protection secondary circuit terminals are fixedly connected to the initial positions of the connection sockets on the bottom surface of the base plate.

[0009] Preferably, the electric switching assembly includes a micro electric push rod fixedly connected to the side wall of the mounting frame and a slider slidably connected to the inner side wall of the mounting frame, and the side walls at both ends of the slider are fixedly connected to limit plates, each of the limit plates slides against the outer wall of the mounting frame, the connecting seat is fixedly connected to the side wall of the limit plate, a connecting rod is fixedly connected to the outer wall of one side of the slider, and the movable end of the micro electric push rod is fixedly connected to one end of the connecting rod.

[0010] Preferably, a groove is provided on the top surface of the sliding block, the interior of the groove is slidably connected to a limiting column, and the limiting column is elastically connected to the inner cavity bottom surface of the groove via a first spring.

[0011] Preferably, three limiting holes are provided on the top surface of each of the mounting frames;

[0012] The limit switching assembly includes six sliding rods slidably connected inside the six limit holes, and a pressure plate is fixedly connected to the top surfaces of the six sliding rods. The pressure plate and the top surfaces of the two mounting frames are elastically connected by six second springs, and the six sliding rods respectively pass through the inner circles of the six second springs.

[0013] Preferably, the limit switching assembly further comprises a first electromagnet fixedly connected to the four corners of the bottom surface of the pressure plate, and a second electromagnet is fixedly connected to the position corresponding to the first electromagnet on the top surface of the two mounting frames.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. Through the limit switching assembly set up, the limit column and the limit hole are connected, so that the knife switch can be fixed after being connected to the corresponding joint. At this time, the connecting seat cannot be pushed by the electric switching device and the push handle to avoid accidental touch. When remote switching is required, the first electromagnet and the second electromagnet are energized and attracted to each other, so that the pressure plate is lowered to push the slide rod, and the slide rod fills the entire limit hole and pushes the limit column out. At this time, the position of the connecting seat is adjusted by the micro electric push rod. When switching on site, the operator can contact the limit by pressing the pressure plate, thereby avoiding accidental touch and facilitating quick switching operations.

[0016] 2. Through the electric switching component that is set up, when remote operation is required, the slider is pushed to move by the micro electric push rod. Initially, the connecting seat is in the middle position. When it is pushed to one side to the limit hole position, the knife switch is connected to the protective joint. When it is pulled to the other side to the limit hole position, the knife switch is connected to the grounding joint, so that remote switching operation can be achieved by controlling the micro electric push rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the protection joint and the grounding joint of the utility model;

[0019] Figure 3 It is a cross-sectional structural schematic diagram of the limit switch component and the electric switch component in the utility model;

[0020] Figure 4 It is an enlarged schematic diagram of the structure of part A in the utility model.

[0021] In the figure: 1. bottom plate; 2. protection joint; 21. protection terminal; 3. grounding joint; 31. grounding terminal; 4. mounting frame; 41. limit hole; 5. electric switching assembly; 51. micro electric push rod; 52. slider; 521. groove; 522. limit column; 523. first spring; 53. limit plate; 54. connecting rod; 6. connecting seat; 61. protection secondary circuit terminal; 7. knife switch; 8. insulating block; 9. limit switching assembly; 91. slide bar; 92. pressure plate; 93. second spring; 94. first electromagnet; 95. second electromagnet; 10. push handle. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example 1: Please refer to Figure 1-Figure 3 A current transformer secondary circuit fast switching operation structure comprises a base plate 1, a plurality of protection joints 2 fixedly connected to one side of the top surface of the base plate 1 and a plurality of grounding joints 3 fixedly connected to the other side of the top surface of the base plate 1, a mounting frame 4 symmetrically fixedly connected to the top surface of the base plate 1, an electric switching component 5 is arranged on each mounting frame 4, a connecting seat 6 is fixedly connected to the side walls of the two electric switching components 5, a plurality of knife switches 7 are fixedly connected to the side walls on both sides of the connecting seat 6, a plurality of insulating blocks 8 are fixedly connected to the positions corresponding to the plurality of knife switches 7 on the top surface of the base plate 1, each knife switch 7 is slidably connected to the corresponding insulating block 8, a limited position switching component 9 is slidably arranged on the top surface of the mounting frame 4, and a push handle 10 is fixedly connected to the top surface of the connecting seat 6.

[0024] A plurality of protection terminals 21 are fixedly connected to the positions of the protection joints 2 on the bottom surface of the base plate 1, a plurality of grounding terminals 31 are fixedly connected to the positions of the grounding joints 3 on the bottom surface of the base plate 1, and a plurality of protection secondary circuit terminals 61 are fixedly connected to the initial positions of the connection seat 6 on the bottom surface of the base plate 1.

[0025] The electric switching assembly 5 includes a micro electric push rod 51 fixedly connected to the side wall of the mounting frame 4 and a slider 52 slidably connected to the inner wall of the mounting frame 4. The side walls at both ends of the slider 52 are fixedly connected to limit plates 53. Each limit plate 53 slides against the outer wall of the mounting frame 4. The connecting seat 6 is fixedly connected to the side wall of the limit plate 53. A connecting rod 54 is fixedly connected to the outer wall of one side of the slider 52. The movable end of the micro electric push rod 51 is fixedly connected to one end of the connecting rod 54.

[0026] In this embodiment: the withstand voltage of the TA housing and the secondary circuit is 1000V, the working voltage of the device is 220V / AC, the maximum breaking current is 10A, the rated voltage of the execution structure is not more than DC48V, the connection capacity is greater than or equal to 10A, the conductor material is copper alloy, the short-circuit time of the TA secondary tap ratio switching electric mechanism is not more than 60s, the connecting seat 6 is initially in the middle position, and the heads of the knife switches 7 on both sides are retracted inside the insulating block 8, and the insulating material is a flame retardant material. During the remote switching operation, the micro-electric push rod 51 pushes the slider 52 to drive the connecting seat 6 to slide to one side, and the knife switch 7 on one side of the connecting seat 6 is connected to the protective joint 2, and the connection capacity is greater than or equal to 10A. When the micro-electric push rod 51 pulls the slider 52 to drive the connecting seat 6 to slide to the other side, the knife switch 7 on the other side of the connecting seat 6 is connected to the grounding joint 3. During the on-site switching operation, the staff pushes the connecting seat 6 to move by the push handle 10 to perform the switching operation.

[0027] Embodiment 2: This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 3-Figure 4 A groove 521 is provided on the top surface of the slider 52 , and a limiting column 522 is slidably connected inside the groove 521 . The limiting column 522 is elastically connected to the bottom surface of the inner cavity of the groove 521 via a first spring 523 .

[0028] Three limiting holes 41 are provided on the top surface of each mounting frame 4;

[0029] The limit switching assembly 9 includes six sliding rods 91 slidably connected to the inside of the six limit holes 41, and a pressure plate 92 is fixedly connected to the top surfaces of the six sliding rods 91. The pressure plate 92 and the top surfaces of the two mounting frames 4 are elastically connected by six second springs 93, and the six sliding rods 91 respectively pass through the inner circles of the six second springs 93.

[0030] The limit switch assembly 9 also includes first electromagnets 94 fixedly connected to the four corners of the bottom surface of the pressure plate 92 , and second electromagnets 95 are fixedly connected to the top surfaces of the two mounting frames 4 at positions corresponding to the first electromagnets 94 .

[0031] In this embodiment: the initial position of the connecting seat and the final position after connection are positioned by the clamping connection between the limit column 522 and the limit hole 41, so as to avoid the movement of the connecting seat 6 caused by accidental touch, and when a remote switching operation is required, the first electromagnet 94 and the second electromagnet 95 are energized and attracted to each other, so that the pressure plate 92 is pressed down to drive the slide bar 91 to move, and the slide bar 91 completely fills the limit hole 41 and pushes the limit column 522 out of it, thereby releasing the limit. When switching on site, the operator can manually press the pressure plate 92 to achieve the above-mentioned unlocking effect, thereby facilitating rapid switching while avoiding accidental touch.

[0032] Working principle: During the remote switching operation, the first electromagnet 64 and the second electromagnet 95 are energized and attract each other, and the pressure plate 92 is pressed down to drive the slide bar 91 to move. The slide bar 91 completely fills the limit hole 41 and pushes the limit column 522 out of it to release the limit. At this time, the micro-electric push rod 51 is started to push the connecting seat 6 to slide to one side. When sliding to the limit hole 41 on one side, the first electromagnet 94 and the second electromagnet 95 are powered off, and the knife switch 7 on one side of the connecting seat 6 is connected to the protective joint 2. The limit column 522 is stuck in the limit hole 41 under the elastic force of the first spring 523. When the micro-electric push rod 51 pulls the connecting seat 6 to slide to the other side to the limit hole 41 on the other side, the other knife switch 7 of the connecting seat 6 is connected to the grounding joint 3. During on-site switching, the operator can realize the above-mentioned limit release operation by pressing down the pressure plate 92, and push the connecting seat 6 to switch by the push handle 10.

[0033] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0034] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A current transformer secondary circuit rapid switching operation structure, comprising a base plate (1), a plurality of protection joints (2) fixedly connected to one side of the top surface of the base plate (1), and a plurality of grounding joints (3) fixedly connected to the other side of the top surface of the base plate (1), characterized in that: The top surface of the base plate (1) is symmetrically fixedly connected with a mounting frame (4), each mounting frame (4) is provided with an electric switching assembly (5), a connecting seat (6) is commonly fixedly connected to the side walls of the two electric switching assemblies (5), a plurality of knife switches (7) are fixedly connected to the side walls on both sides of the connecting seat (6), a plurality of insulating blocks (8) are fixedly connected to the positions of the plurality of knife switches (7) on the top surface of the base plate (1), each of the knife switches (7) is slidably connected to the corresponding insulating block (8), a limited position switching assembly (9) is slidably provided on the top surface of the mounting frame (4), and a push handle (10) is fixedly connected to the top surface of the connecting seat (6).

2. A current transformer secondary circuit fast switching operation structure according to claim 1, characterized in that: A plurality of protection terminals (21) are fixedly connected to positions corresponding to the plurality of protection joints (2) on the bottom surface of the base plate (1), a plurality of grounding terminals (31) are fixedly connected to positions corresponding to the plurality of grounding joints (3) on the bottom surface of the base plate (1), and a plurality of protection secondary circuit terminals (61) are fixedly connected to positions corresponding to the initial positions of the connection base (6) on the bottom surface of the base plate (1).

3. A current transformer secondary circuit fast switching operation structure according to claim 1, characterized in that: The electric switching assembly (5) comprises a micro electric push rod (51) fixedly connected to the side wall of the mounting frame (4) and a slider (52) slidably connected to the inner wall of the mounting frame (4); both end side walls of the slider (52) are fixedly connected to limit plates (53); each limit plate (53) slides against the outer wall of the mounting frame (4); the connecting seat (6) is fixedly connected to the side wall of the limit plate (53); a connecting rod (54) is fixedly connected to one side outer wall of the slider (52); and the movable end of the micro electric push rod (51) is fixedly connected to one end of the connecting rod (54).

4. A current transformer secondary circuit fast switching operation structure according to claim 3, characterized in that: A groove (521) is provided on the top surface of the sliding block (52), the interior of the groove (521) is slidably connected to a limiting column (522), and the limiting column (522) is elastically connected to the bottom surface of the inner cavity of the groove (521) via a first spring (523).

5. A current transformer secondary circuit fast switching operation structure according to claim 1, characterized in that: Three limiting holes (41) are provided on the top surface of each of the mounting frames (4); The limit switching assembly (9) comprises six sliding rods (91) slidably connected inside the six limit holes (41); a pressure plate (92) is fixedly connected to the top surfaces of the six sliding rods (91); the pressure plate (92) is elastically connected to the top surfaces of the two mounting frames (4) via six second springs (93); and the six sliding rods (91) respectively penetrate the inner circles of the six second springs (93).

6. A current transformer secondary circuit fast switching operation structure according to claim 5, characterized in that: The limit switching assembly (9) further comprises a first electromagnet (94) fixedly connected to the four corners of the bottom surface of the pressure plate (92), and a second electromagnet (95) fixedly connected to the top surfaces of the two mounting frames (4) at positions corresponding to the first electromagnet (94).

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