Protective voltage transformer connected with lightning arrester and provided with fuse

Abstract

The utility model discloses a protection voltage transformer connected with a lightning arrester and provided with a fuse. The protection voltage transformer comprises a transformer body, the fuse and the lightning arrester, the fuse is arranged in a primary insulating cylinder at the top of the mutual inductor body; a connecting insert is pre-embedded in the middle of the top surface of the primary insulating cylinder; the lightning arrester is vertically arranged in the middle of the top face of the primary insulating cylinder, the lower end of the lightning arrester is conductively connected with the connecting insert through the connecting rod, the inner end of the connecting insert is conductively connected with one end of the fuse, and the other end of the fuse is conductively connected with the mutual inductor body. The lightning protection effect is achieved by arranging the lightning arrester, meanwhile, the pre-buried connecting insert is arranged in the middle of the top face of the primary insulating cylinder, enough space can be provided, the lightning arrester and the connecting insert can be conveniently connected through the connecting rod, the lightning arrester is supported through the connecting rod, the mutual inductor body serves as a supporting base, and the mutual inductor is convenient to use. The lightning protection device has good supporting performance, is simple in structure and convenient to install, and can effectively improve the lightning protection reliability.

Description

Technical Field

[0001] This utility model relates to the technical field of voltage transformers, and in particular to a voltage transformer with fuse protection connected to a surge arrester. Background Technology

[0002] like Figure 1 As shown, the existing scheme for connecting surge arresters with fuse protection for voltage transformers involves mounting surge arrester 1' on the handcart bracket 2' and electrically connecting it to the transformer contact arm 4' via a copper busbar 3' mounted on the connecting plate. However, this scheme is cumbersome to install and remove the transformer 5' and surge arrester 1', involves too many installation parts, and requires high assembly precision. Adding a surge arrester can also easily lead to insufficient cabinet dimensions. Secondly, the horizontal placement of the surge arrester necessitates a larger external creepage distance to prevent discharge to the cabinet panel (ground potential). Furthermore, the distance between the surge arrester and the transformer results in poor lightning protection.

[0003] Therefore, a handcart with a voltage transformer and surge arrester, as disclosed in Chinese Patent CN 203774664 U, can improve lightning protection by vertically placing the surge arrester, eliminating the need for a large creepage distance. However, this solution still has the following shortcomings: 1. In this solution, the surge arrester is placed at an angle, too close to the handcart cabinet panel; if the distance is too small, it may discharge onto the cabinet panel. 2. When placed at an angle, the stress point of the surge arrester is on the connecting piece, and the stress is uneven, making the installation unreliable. Over time, this can easily cause the connecting piece to bend, resulting in the surge arrester falling off and reducing product reliability. Utility Model Content

[0004] The purpose of this utility model is to provide a voltage transformer with fuse protection connected to a surge arrester, which has good lightning protection effect and a stable and reliable structure.

[0005] To achieve the above objectives, the solution of this utility model is:

[0006] A voltage transformer with fuse protection and connected to a surge arrester includes a transformer body, a fuse, and a surge arrester. The fuse is disposed inside a primary insulating cylinder at the top of the transformer body. A connecting insert is pre-embedded in the middle of the top surface of the primary insulating cylinder. The surge arrester is erected in the middle of the top surface of the primary insulating cylinder, and its lower end is electrically connected to the connecting insert via a connecting rod. The inner end of the connecting insert is electrically connected to one end of the fuse, and the other end of the fuse is electrically connected to the transformer body.

[0007] Furthermore, the connecting insert is a nut cast into a primary insulating cylinder; the connecting rod is a double-ended screw.

[0008] Furthermore, the nut and the double-ended screw are of type M10.

[0009] Further, the top surface of the primary insulation cylinder is provided with an insulation sleeve surrounding the outer periphery of the lightning arrester.

[0010] Further, the voltage transformer is installed on a handcart, and a cabinet plate is vertically arranged on one side of the handcart; the insulation sleeve is higher on the side close to the cabinet plate than on the side away from the cabinet plate.

[0011] Further, the primary insulation cylinder and the insulation sleeve are made of resin or ceramic.

[0012] Further, a conductor is pre-embedded in the primary insulation cylinder and is electrically connected to the connecting insert and the fuse.

[0013] Further, the conductor is a soft wire.

[0014] Further, one end of the conductor is electrically connected to the inner end of the connecting insert, and the other end is electrically connected to the primary high-voltage contact end of the fuse.

[0015] Further, the primary insulation cylinder has an opening at one end to communicate with the inner cavity, and a large nut is arranged at the opening, and the large nut is detachably fixed with a nut insert pre-embedded in the opening; the fuse is installed in the inner cavity by passing through the large nut at the opening, and the inner end of the fuse is electrically connected to the body of the voltage transformer, and the outer end is electrically connected to the primary high-voltage contact end, and the primary high-voltage contact end is screwed to the large nut at the opening to block and fix the fuse in the inner cavity; the conductor is pre-embedded in the primary insulation cylinder and is electrically connected to the nut insert, and the nut insert, the large nut, the primary high-voltage contact end and the fuse are electrically connected in sequence.

[0016] After the above technical scheme is adopted, the lightning arrester is arranged to achieve the lightning protection effect, and the pre-embedded connecting insert is arranged in the middle of the top surface of the primary insulation cylinder, so that sufficient space is provided, the lightning arrester and the connecting insert can be conveniently connected by the connecting rod, the lightning arrester is supported by the connecting rod, the body of the transformer is used as a support seat, good support performance is achieved, the structure is simple, installation is convenient, and the lightning protection reliability can be effectively improved. The lightning arrester is close to the body of the transformer, and the lightning protection effect is good.

[0017] Moreover, the fuse can be separately installed in the primary insulation cylinder, and the lightning arrester can be independently installed above the primary insulation cylinder, so that the independence of the installation and removal of the two can be realized, and the assembly and installation of the product are more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic view of the prior art;

[0019] Figure 2 is a schematic view of an embodiment of the present application.

[0020] Labeling Explanation: 1. Instrument transformer body; 11. Primary insulation cylinder; 111. Opening; 112. Inner cavity; 112. Insulating sleeve; 12. Fuse; 2. Primary high-voltage contact terminal; 21. Surge arrester; 3. Connecting insert; 4. Connecting rod; 5. Handcart; 6. Cabinet panel; 61. Conductor; 7. Nut insert; 8. Large nut; 9. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] like Figure 2 As shown in the figure, a voltage transformer with fuse protection connected to a surge arrester in this embodiment includes a transformer body 1, a fuse 2 and a surge arrester 3; the fuse 2 is disposed inside a primary insulating cylinder 11 cast on the top of the transformer body 1; the fuse 2 is used to protect the transformer body 1.

[0023] A connecting insert 4 is pre-embedded in the middle of the top surface of the primary insulating cylinder 11; the surge arrester 3 is erected in the middle of the top surface of the primary insulating cylinder 11, and the lower end of the surge arrester 3 is electrically connected to the connecting insert 4 through the connecting rod 5, while the inner end of the connecting insert 4 is electrically connected to one end of the fuse 2, and the other end of the fuse 2 is electrically connected to the transformer body 1.

[0024] Lightning arrester 3 is installed to achieve lightning protection. A pre-embedded connecting insert 4 is provided in the center of the top surface of the primary insulation cylinder 11, providing sufficient space to easily connect the lightning arrester 3 to the connecting insert 4 using a connecting rod 5. The connecting rod 5 supports the lightning arrester 3, and the transformer body 1 serves as a support base, providing good support performance. The structure is simple, installation is convenient, and the reliability of the lightning arrester 3 is effectively improved. Furthermore, the lightning arrester 3 is installed close to the transformer body 1, resulting in good lightning protection.

[0025] Furthermore, the fuse 2 can be installed separately inside the primary insulation cylinder 11, while the surge arrester 3 can be installed independently above the primary insulation cylinder 11, which allows for independent installation and removal of the two, making it more convenient for product assembly and installation.

[0026] In this embodiment, the connecting insert 4 can be an M10 type nut cast inside the primary insulating cylinder 11; the connecting rod 5 can be an M10 type double-ended screw.

[0027] Meanwhile, an insulating sleeve 12 may also be provided at the center of the top surface of the primary insulating cylinder 11, surrounding the outer perimeter of the surge arrester 3, to enhance lightning protection and increase creepage distance.

[0028] Generally, the voltage transformer is installed on the handcart 6, and the cabinet plate 61 is vertically arranged on one side of the handcart 6. Thus, the insulation sleeve 12 is higher on the side close to the cabinet plate 61 than on the side far from the cabinet plate 61. The arrester 3 can be prevented from discharging to the cabinet plate 61, and the product design according to the high creepage distance is not required, thereby saving the cost.

[0029] Further, the arrester 3 is located in the middle of the primary insulation cylinder 11, and the co-vehicle of the arrester 3 and the transformer with the built-in fuse 2 can be realized. The arrester 3 is relatively far from the cabinet plate 61, and the discharge of the upper part of the vertically installed arrester 3 to the cabinet plate 61 is further avoided.

[0030] Generally, the primary insulation cylinder 11 and the insulation sleeve 12 can be made of resin or ceramic material by pouring. Good insulation effect is achieved.

[0031] In the embodiment, the conductor 7 can be pre-embedded in the primary insulation cylinder 11 by pouring. The conductor 7 is used to electrically connect the connecting insert 4 and the fuse 2.

[0032] One end of the conductor 7 is electrically connected to the inner end of the connecting insert 4, and the other end is electrically connected to the primary high-voltage contact end 21 of the fuse 2.

[0033] Specifically, the primary insulation cylinder 11 has an opening 111 communicating with an inner cavity 112 at one end. A large nut 9 is arranged at the opening 111, and the large nut 9 is detachably fixed with a nut insert 8 pre-embedded in the opening 111. The fuse 2 passes through the large nut 9 from the opening 111 and is installed in the inner cavity 112. The inner end of the fuse 2 is electrically connected to the voltage transformer body 1, and the outer end is electrically connected to the primary high-voltage contact end 21. The primary high-voltage contact end 21 is screwed to the large nut 9 at the opening 111 to block and fix the fuse 2 in the inner cavity 112. The conductor 7 is pre-embedded in the primary insulation cylinder 11 and is electrically connected to the nut insert 8 by welding. The nut insert 8, the large nut 9, the primary high-voltage contact end 21, and the fuse 2 are electrically connected in sequence. The conductor 7 can be a soft wire or the like.

[0034] The pre-embedded conductor 7 can improve the convenience of the late assembly of the product and ensure the reliability of the product. The nut insert 8 is pre-embedded in the primary insulation cylinder 11 at the same time, which facilitates the late installation of the fuse 2.

[0035] The above only describes the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solution falling within the concept of the present application belongs to the protection scope of the present application. It should be noted that equivalent changes and modifications made by those skilled in the art without departing from the principles of the present application also belong to the protection scope of the present application.

[0036] In the description of the embodiments of the present application, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship commonly understood by those skilled in the art, only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" and "several" is two or more, unless otherwise explicitly and specifically limited.

Claims

1. A fuse-protected voltage transformer connected with a lightning arrester, comprising a transformer body, a fuse and a lightning arrester; the fuse is arranged in a primary insulation cylinder on the top of the transformer body; characterized in that: a connecting insert is embedded in the middle of the top surface of the primary insulation cylinder; the lightning arrester is vertically arranged in the middle of the top surface of the primary insulation cylinder, and the lower end of the lightning arrester is conductively connected with the connecting insert through a connecting rod, while the inner end of the connecting insert is conductively connected with one end of the fuse, and the other end of the fuse is conductively connected with the transformer body.

2. A fused potential transformer connected to a surge arrester according to claim 1, characterized in that: The connecting insert is a nut cast in the primary insulation cylinder; the connecting rod is a double-headed screw rod.

3. A fused potential transformer connected to a surge arrester according to claim 2, characterized in that: The nut and the double-headed screw rod are of M10 type.

4. A fused potential transformer connected to a surge arrester according to claim 1, characterized in that: The middle of the top surface of the primary insulation cylinder is further provided with an insulation sleeve surrounding the outer periphery of the lightning arrester.

5. A fused potential transformer connected to a surge arrester according to claim 4, characterized in that: The voltage transformer is mounted on a handcart, and a cabinet plate is vertically arranged on one side of the handcart; the side of the insulation sleeve close to the cabinet plate is higher than the other side away from the cabinet plate.

6. A fused potential transformer connected to a surge arrester according to claim 4, characterized in that: The primary insulation cylinder and the insulation sleeve are made of resin or ceramic material.

7. A fused potential transformer connected to a surge arrester according to claim 1, characterized in that: A conductor is embedded in the primary insulation cylinder and conductively connected with the connecting insert and the fuse.

8. A fused potential transformer connected to a surge arrester according to claim 7, characterized in that: The conductor is a soft wire.

9. A fused protected voltage transformer connected to a surge arrester according to claim 7 or 8, characterized in that: One end of the conductor is conductively connected with the inner end of the connecting insert, and the other end is conductively connected with the primary high-voltage contact end of the fuse.

10. A fused potential transformer connected to a surge arrester according to claim 9, characterized in that: One end of the primary insulation cylinder has an opening communicating with the inner cavity, and a large nut is arranged at the opening; the fuse is installed in the inner cavity by passing through the large nut at the opening, and the inner end of the fuse is conductively connected with the transformer body, while the outer end is conductively connected with the primary high-voltage contact end; the primary high-voltage contact end is screwed into the large nut at the opening, thereby sealing and fixing the fuse in the inner cavity; the conductor is embedded in the primary insulation cylinder and conductively connected with the nut insert; the nut insert, the large nut, the primary high-voltage contact end and the fuse are conductively connected in sequence.

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