A connecting device for the low-voltage terminal of a power transformer and a busbar

Abstract

The utility model relates to low -voltage post -busbar connection technical field, and disclose: a kind of for electric power transformer low -voltage post head and busbar's connecting device, including the connecting plate on multiple low -voltage posts in transformer top and with bolt fastening connecting plate, busbar, the outside of multiple low -voltage posts is connected with two symmetrically arranged protective shell, the outer wall of one protective shell is provided with the operating slot corresponding with low -voltage post, operating slot is fixedly connected with ratchet plate, the top of ratchet plate is clamped with corresponding push plate. The utility model cooperates through protective shell, push plate, push gear and ratchet plate, can make extruded plate with insulating pad layer bolt tight, so, even the nut on bolt loosens and rotates, bolt cannot move back on busbar, connecting plate, simultaneously extruded plate will also extrude busbar close to connecting plate, to effectively prevent the loose between busbar and connecting plate, avoid the decline of conductivity.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage busbar connection technology, specifically a connection device for connecting the low-voltage column head and busbar of a power transformer. Background Technology

[0002] A prefabricated substation (referred to as a "prefabricated substation") is a compact power distribution device that integrates high-voltage switchgear, distribution transformers, and low-voltage switchgear into a closed steel structure enclosure. It is suitable for 10 / 0.4kV three-phase AC systems. The busbar is the conductive component connecting electrical equipment within the substation, responsible for power collection, distribution, and system interconnection.

[0003] In the existing technology, the top of the transformer is equipped with high and low voltage connection terminals. The low voltage terminal is connected to the busbar by bolts, and the other end of the busbar enters the low voltage cabinet for conductive connection.

[0004] However, when the top of the low-voltage terminal head of the transformer is connected to the busbar with bolts, vibrations during transformer operation may cause the bolts to loosen, thereby affecting the conductive connection between the busbar and the low-voltage terminal head. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a connection device for the low-voltage terminal head and busbar of a power transformer, thereby stabilizing the connection between the low-voltage terminal head and the end of the busbar.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a connection device for connecting low-voltage columns and busbars of a power transformer, comprising connecting plates on multiple low-voltage columns located at the top of the transformer and bolts fastened to the connecting plates and busbars. Two symmetrically arranged protective shells are connected to the outer sides of the multiple low-voltage columns. One of the protective shells has an operating groove corresponding to the low-voltage column on its outer wall. A ratchet plate is fixedly connected in the operating groove. A corresponding push plate is engaged at the top of the ratchet plate. Push teeth corresponding to the ratchet plate are fixedly connected to the bottom surface of the push plate. An extrusion plate that abuts against multiple bolts is fixedly connected to the end of the push plate. An insulating pad is fixedly connected to the side of the extrusion plate that abuts against the bolts.

[0007] Furthermore, a slot is provided at the end of the push plate away from the extrusion plate, and a U-shaped insert rod is engaged in the slot. Both ends of the U-shaped insert rod are inserted into the protective shell.

[0008] Furthermore, a pull ring is fixedly connected to the outer end of the U-shaped plug.

[0009] Furthermore, a stiffening plate is fixedly connected to the bottom of the ratchet plate, and the stiffening plate is fixedly connected to the outer wall of the protective shell.

[0010] Furthermore, the outer wall of the protective shell is fixedly connected with an external lug, and the external lug is threaded with multiple fastening nuts. The protective shell is connected to the transformer through the fastening nuts.

[0011] Furthermore, one of the protective shells has a clearance groove for the busbar to make way, and the other protective shell has an extension block corresponding to the clearance groove.

[0012] Furthermore, the outer sides of both ends of the U-shaped plug are chamfered.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This utility model, through the cooperation of a protective shell, a push plate, push teeth, and a ratchet plate, allows the extrusion plate, carrying an insulating pad, to press the bolt tightly. In this way, even if the nut on the bolt loosens and rotates, the bolt cannot move or back on the busbar and connecting plate. At the same time, the extrusion plate also presses the busbar closer to the connecting plate, thereby effectively preventing the busbar from separating from the connecting plate and avoiding a decrease in conductivity. The structure is simple, easy to operate, and highly practical. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the low-pressure column head and connecting plate of this utility model;

[0016] Figure 2 For this Figure 2 A magnified three-dimensional structural diagram of A in the middle;

[0017] Figure 3 This is a three-dimensional structural diagram of the entire utility model;

[0018] Figure 4 This is a three-dimensional cross-sectional structural diagram of the two protective shells of this utility model in their unfolded state;

[0019] Figure 5 This is a three-dimensional cross-sectional structural diagram of the protective shell of this utility model;

[0020] Figure 6 This is a three-dimensional structural diagram of the extrusion plate, push plate, and ratchet plate of this utility model in their unfolded state.

[0021] In the diagram: 1. Low-pressure column; 2. Connecting plate; 3. Bolt; 4. Protective shell; 41. Leaving groove; 42. Outer ear; 43. Extension block; 44. Operating groove; 5. Ratchet plate; 51. Rib plate; 6. Push plate; 61. Slot; 62. Push tooth; 7. U-shaped insert rod; 71. Pull ring; 8. Extrusion plate; 81. Insulating pad. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] like Figures 1 to 6 As shown, a connection device for connecting the low-voltage column head and busbar of a power transformer includes a connecting plate 2 on multiple low-voltage columns 1 located at the top of the transformer and bolts 3 fastened to the connecting plate 2 and the busbar. Two symmetrically arranged protective shells 4 are connected to the outer side of the multiple low-voltage columns 1. One of the protective shells 4 has an operating groove 44 corresponding to the low-voltage column 1 on its outer wall. A ratchet plate 5 is fixedly connected in the operating groove 44. A corresponding push plate 6 is engaged at the top of the ratchet plate 5. A push tooth 62 corresponding to the ratchet plate 5 is fixedly connected to the bottom surface of the push plate 6. An extrusion plate 8 that abuts against the multiple bolts 3 is fixedly connected to the end of the push plate 6. An insulating pad 81 is fixedly connected to the side of the extrusion plate 8 that abuts against the bolts 3.

[0024] like Figures 1 to 6 As shown, in the present invention, the connection device for connecting the low-voltage column head and the busbar of the power transformer is used such that the low-voltage column 1 and the busbar are stably connected by bolts 3, and the busbar stably outputs low-voltage current.

[0025] After the low-voltage column 1 and the busbar are installed, the protective shell 4 with the ratchet plate 5 can be installed on the top of the transformer first. Then, push the push plate 6. The push plate 6 drives the push tooth 62 to move misaligned on the ratchet plate 5. At the same time, the push plate 6 drives the pressing plate 8 to abut against the outer wall of the end of the bolt 3. As the push plate 6, the push tooth 62 and the ratchet plate 5 are misaligned and locked, the pressing plate 8 with the insulating pad 81 can press the bolt 3 tightly. In this way, even if the nut on the bolt 3 loosens and rotates, the bolt 3 cannot move backward on the busbar and the connecting plate 2. At the same time, the pressing plate 8 will also press the busbar closer to the connecting plate 2, thereby effectively preventing the busbar and the connecting plate 2 from loosening and avoiding a decrease in conductivity.

[0026] like Figure 4 , Figure 5 and Figure 6 As shown, a slot 61 is provided at the end of the push plate 6 away from the extrusion plate 8. A U-shaped insert rod 7 is engaged in the slot 61, and both ends of the U-shaped insert rod 7 are inserted into the protective shell 4.

[0027] Specifically, after the push plate 6, push tooth 62 and ratchet plate 5 are engaged, in order to prevent the push plate 6 from moving upward and causing the push tooth 62 to separate from the ratchet plate 5, the U-shaped insert 7 can be inserted into the slot 61 and inserted into the protective shell 4. In this way, the position of the push plate 6 cannot rise, so that the push tooth 62 is firmly locked on the ratchet plate 5.

[0028] The upward thrust of the push plate 6 in the operating groove 44 on the U-shaped plug 7 effectively ensures the stability of the end of the U-shaped plug 7 being locked inside the protective shell 4.

[0029] like Figure 5 and Figure 6 As shown, a pull ring 71 is fixedly connected to the outer end of the U-shaped plug 7. The pull ring 71 facilitates the pulling operation of the U-shaped plug 7.

[0030] like Figure 5 and Figure 6 As shown, a stiffening plate 51 is fixedly connected to the bottom of the ratchet plate 5, and the stiffening plate 51 is fixedly connected to the outer wall of the protective shell 4. The stiffening plate 51 is provided to facilitate the reinforcement of the ratchet plate 5 and prevent it from loosening.

[0031] like Figure 1 and Figure 3 As shown, the outer wall of the protective shell 4 is fixedly connected with external lugs 42, and multiple fastening nuts are threaded onto the external lugs 42. The protective shell 4 is connected to the transformer through the fastening nuts. The external lugs 42 and the fastening nuts facilitate the fastening installation of two symmetrical protective shells 4 on the transformer.

[0032] like Figure 1 and Figure 2 As shown, one of the protective shells 4 has a clearance groove 41 for the busbar to make way, and the other protective shell 4 has an extension block 43 corresponding to the clearance groove 41. The clearance groove 41 makes it easy for the busbar to extend from between the protective shells 4, and the extension block 43 blocks the clearance groove 41 as much as possible. This can effectively reduce the amount of dust that falls on the connecting plate 2, bolt 3, extrusion plate 8 and other structures inside the protective shell 4, thus facilitating each maintenance and cleaning.

[0033] like Figure 6 As shown, the outer ends of both ends of the U-shaped plug 7 are chamfered. The chamfering facilitates the guidance of the U-shaped plug 7 when it is inserted into the protective shell 4.

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

Claims

1. A connection device for connecting low-voltage posts and busbars of a power transformer, comprising connecting plates (2) on a plurality of low-voltage posts (1) located at the top of the transformer and bolts (3) fastened to the connecting plates (2) and the busbars, characterized in that, Two symmetrically arranged protective shells (4) are connected to the outer side of the multiple low-pressure columns (1). One of the protective shells (4) has an operating groove (44) corresponding to the low-pressure column (1) on its outer wall. A ratchet plate (5) is fixedly connected in the operating groove (44). A corresponding push plate (6) is snapped into the top of the ratchet plate (5). A push tooth (62) corresponding to the ratchet plate (5) is fixedly connected to the bottom surface of the push plate (6). An extrusion plate (8) that abuts against multiple bolts (3) is fixedly connected to the end of the push plate (6). An insulating pad (81) is fixedly connected to the side of the extrusion plate (8) that abuts against the bolts (3).

2. The connection device for connecting the low-voltage terminal head and busbar of a power transformer according to claim 1, characterized in that, The push plate (6) has a slot (61) at one end away from the extrusion plate (8), and a U-shaped plug (7) is engaged in the slot (61). Both ends of the U-shaped plug (7) are inserted into the protective shell (4).

3. A connection device for connecting the low-voltage terminal head and busbar of a power transformer according to claim 2, characterized in that, A pull ring (71) is fixedly connected to the outer end of the U-shaped plug (7).

4. A connection device for connecting the low-voltage terminal head and busbar of a power transformer according to claim 3, characterized in that, The bottom of the ratchet plate (5) is fixedly connected to a stiffening plate (51), and the stiffening plate (51) is fixedly connected to the outer wall of the protective shell (4).

5. A connection device for connecting the low-voltage terminal head and busbar of a power transformer according to claim 4, characterized in that, The outer wall of the protective shell (4) is fixedly connected with an outer ear (42), and the outer ear (42) is threaded with multiple fastening nuts. The protective shell (4) is connected to the transformer through the fastening nuts.

6. A device for connecting the low voltage terminal of a power transformer to a busbar according to claim 5, characterized in that One of the protective shells (4) is provided with a clearance groove (41) for the busbar to make way, and the other protective shell (4) is provided with an extension block (43) corresponding to the clearance groove (41).

7. A device for connecting the low voltage terminal of a power transformer to a busbar according to claim 6, characterized in that The outer sides of both ends of the U-shaped plug (7) are chamfered.

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