Current transformer

Abstract

The utility model discloses a current transformer, which relates to the technical field of current transformers, and comprises a shell and a transformer body, the transformer body is arranged in the shell, the transformer body comprises a secondary coil, a primary coil and two connecting pieces, the secondary coil is arranged outside the primary coil in a surrounding manner, and the secondary coil is arranged outside the primary coil in a surrounding manner. The secondary coil and the primary coil are spaced, an insulating layer is wound outside the iron core, an enameled wire is wound outside the insulating layer, the primary coil is connected with one end of each of the two connecting pieces, sockets are formed in the shell, the positions of the sockets correspond to the positions of the two connecting pieces, and the two sockets are used for inserting side expansion bus connectors. The current transformer has the advantages that the primary terminal sealing capability is higher, the discharge phenomenon is reduced, and the safety is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, in particular to a current transformer. Background Art

[0002] Current transformers are crucial components in urban power distribution networks, and are often installed in cabinets. Currently, the primary terminals of commonly used current transformers are bolted to the switchgear busbars, ensuring continuity. However, due to the exposed primary terminals and busbars, and the small size of the ring main unit (RMU), the insulation distance between the busbars and the cabinet is insufficient, making discharge more likely and failing to meet operational requirements. Therefore, a current transformer that meets the requirements of RMUs is urgently needed. Utility Model Content

[0003] The purpose of the utility model is to provide a current transformer to solve the problems existing in the above-mentioned prior art and to have higher safety performance.

[0004] To achieve the above purpose, the present invention provides the following solutions:

[0005] The utility model provides a current transformer, a shell and a transformer body, the transformer body is arranged in the shell, the transformer body includes a secondary coil, a primary coil and two connecting pieces fixedly arranged in the shell, the secondary coil is arranged around the outside of the primary coil, and there is a gap between the secondary coil and the primary coil, the secondary coil includes an iron core, an insulating layer and an enameled wire, the iron core is wound with the insulating layer, and the insulating layer is wound with the enameled wire, the primary coil is connected to one end of each of the two connecting pieces, two sockets are provided on the shell, and the ends of the two connecting pieces away from the primary coil respectively extend into the two sockets, and the shapes of the two sockets match the shapes of the side-expanded busbar connector and are both used to insert the side-expanded busbar connector.

[0006] Preferably, the shell is formed by pouring insulating material outside the transformer body, and the secondary coil, the primary coil and the two connecting parts are all embedded in the shell.

[0007] Preferably, it further comprises a mounting plate, which is fixedly connected to the side of the housing where the socket is provided, and through holes are provided on the mounting plate, and positions of two through holes correspond to positions of the two sockets respectively.

[0008] Preferably, the shell is cast from epoxy resin.

[0009] Preferably, the outer surface of the housing is covered with a semiconductive layer.

[0010] Preferably, the side surfaces and bottom surface of the housing are covered with the semiconductive layer.

[0011] Preferably, the transformer body further includes a secondary connecting wire and a secondary terminal, one end of the secondary connecting wire is connected to the secondary coil, and the other end is connected to the secondary terminal, and the secondary terminal is exposed from one side of the housing.

[0012] Preferably, the shape of the socket matches the shape of the State Grid side expansion busbar connector on the cabinet.

[0013] Preferably, the mounting plate is made of metal.

[0014] Preferably, a buffer protection layer is wound around the primary coil and the secondary coil.

[0015] Compared with the prior art, the utility model has achieved the following technical effects:

[0016] The current transformer provided by the utility model has a socket provided on the shell, so that the side-expanded busbar connector on the cabinet can be inserted into the socket, and the side-expanded busbar connector and the connecting piece are connected, replacing the original wiring method of the transformer primary terminal and the copper bus. Since the State Grid side-expanded busbar connector is inserted into the socket, the connecting piece is avoided from being exposed outside the shell after the cabinet is connected, the utility model has a strong sealing ability, reduces the occurrence of discharge phenomenon, and improves safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A cross-sectional view of the current transformer provided by the utility model;

[0019] In the figure: 1. Shell; 2. Iron core; 3. Secondary coil; 4. Primary coil; 5. Connector; 6. Socket; 7. Buffer protective layer; 9. Secondary connecting wire; 10. Secondary terminal; 11. Mounting plate; 12. Semi-conductive layer. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] The purpose of the utility model is to provide a current transformer to solve the problems existing in the above-mentioned prior art and to have higher safety performance.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0023] The utility model provides a current transformer, such as Figure 1 As shown, it includes: a shell 1 and a transformer body, the transformer body is arranged in the shell 1, the transformer body includes an iron core 2, a secondary coil 3, a primary coil 4 and two connectors 5 fixed in the shell 1, the secondary coil 3 is arranged around the outside of the primary coil 4, and there is a distance between the secondary coil 3 and the primary coil 4, the secondary coil includes an iron core, an insulation layer and an enameled wire, the iron core 2 is wrapped with an insulation layer, and the insulation layer is wrapped with enameled wire, the primary coil 4 is connected to one end of each of the two connectors 5, and two sockets 6 are provided on the shell 1. The ends of the two connectors 5 away from the primary coil 4 are respectively extended into the two sockets 6, and the current transformer is used to be arranged in the cabinet. The shape of the two sockets 6 matches the shape of the side expansion busbar connector on the cabinet and both are used to insert the side expansion busbar connector.

[0024] The current transformer provided by the utility model provides a socket 6 on the shell 1, so that the side-expansion busbar connector on the cabinet can be inserted into the socket 6, and the side-expansion busbar connector and the connecting piece 5 are connected, replacing the original wiring method of the transformer primary terminal and the copper bus. Since the State Grid side-expansion busbar connector is inserted into the socket 6, the connecting piece 5 is avoided from being exposed outside the shell 1 after the cabinet is connected. The utility model has a strong sealing ability, reduces the occurrence of discharge phenomenon, and improves safety.

[0025] In a preferred embodiment of this embodiment, the housing 1 is formed by casting an insulating material outside the transformer body, the socket 6 is formed by casting the housing 1, and the iron core 2, secondary coil 3, primary coil 4, and two connectors 5 are all embedded in the housing 1. The transformer body is fixed by casting the insulating material outside the transformer body to prevent the iron core 2, secondary coil 3, primary coil 4, and two connectors 5 from shifting during transportation or installation. When casting the housing 1, the iron core 2, secondary coil 3, primary coil 4, and connectors 5 are fixed by a mold, and the position of the socket 6 is fixed by the mold before casting.

[0026] In a preferred embodiment of this embodiment, a mounting plate 11 is further included. The mounting plate 11 is fixedly connected to the side of the housing 1 where the socket 6 is provided. The mounting plate 11 is provided with through holes, and the positions of the two through holes correspond to the positions of the two sockets 6. The mounting plate 11 fixes and protects the position of the socket 6 of the current transformer, thereby improving the risk resistance of the current transformer.

[0027] In a preferred embodiment of this embodiment, the housing 1 is cast with epoxy resin. Epoxy resin has good insulation performance and meets installation and use requirements after vacuum casting.

[0028] In a preferred embodiment of this embodiment, the outer surface of the housing 1 is covered with a semiconductive layer 12. Providing this semiconductive layer 12 on the outer surface of the housing 1 allows the outer surface of the housing 1 to be directly grounded when in contact with the cabinet, placing the outer surface of the current transformer at ground potential. This reduces the risk of discharge from the housing 1 and enables the current transformer to be touchable during operation. The semiconductive layer 12 can be sprayed with a semi-electrical insulating paint.

[0029] In order to save costs, in a preferred implementation of this embodiment, the side and bottom surfaces of the housing 1 are covered with a semiconductive layer 12 .

[0030] In a preferred embodiment of this embodiment, the transformer body further includes a secondary connecting wire 9 and a secondary terminal 10. One end of the secondary connecting wire 9 is connected to the secondary coil 3, and the other end is connected to the secondary terminal 10. The secondary terminal 10 is exposed from one side of the housing 1. The provision of the secondary terminal 10 allows the secondary coil 3 to be more conveniently connected to an external circuit.

[0031] In a preferred embodiment of this embodiment, the shape of socket 6 matches the shape of the State Grid-side expansion busbar connector on the cabinet. The State Grid-side expansion busbar connector and its matching socket provide enhanced sealing and protection, enabling more uniform electric field distribution, improved insulation performance, and greater safety.

[0032] In order to improve the strength of the mounting plate 11 , in a preferred implementation of this embodiment, the mounting plate 11 is made of metal.

[0033] In a preferred embodiment of this embodiment, a buffer protective layer 7 is wrapped around the primary coil 4 and the secondary coil 3. The protective layer 7 can protect the primary coil 4 and the secondary coil 3 during the casting process, thereby preventing the primary coil 4 and the secondary coil 3 from being damaged during the casting process of the housing 1.

[0034] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A current transformer, characterized in that: include: The shell and the transformer body are arranged in the shell, and the transformer body includes a secondary coil, a primary coil and two connecting parts fixed in the shell. The secondary coil is arranged around the outside of the primary coil, and there is a gap between the secondary coil and the primary coil. The secondary coil includes an iron core, an insulating layer and an enameled wire. The insulating layer is wound around the outside of the iron core, and the enameled wire is wound around the outside of the insulating layer. The primary coil is connected to one end of each of the two connecting parts. Two sockets are provided on the shell, and the ends of the two connecting parts away from the primary coil are respectively extended into the two sockets. The current transformer is used to be arranged in the cabinet, and the shapes of the two sockets match the shapes of the side expansion busbar connector on the cabinet and are both used to insert the side expansion busbar connector.

2. The current transformer according to claim 1, characterized in that: The shell is formed by pouring insulating material outside the transformer body, the socket is formed by pouring the shell, and the secondary coil, the primary coil and the two connectors are all embedded in the shell.

3. The current transformer according to claim 1, characterized in that: It also includes a mounting plate, which is fixedly connected to the side of the shell where the socket is provided. The mounting plate is provided with through holes, and the positions of the two through holes correspond to the positions of the two sockets respectively.

4. The current transformer according to claim 2, characterized in that: The shell is formed by pouring epoxy resin.

5. The current transformer according to claim 2, characterized in that: The outer surface of the housing is covered with a semiconductive layer.

6. The current transformer according to claim 5, characterized in that: The side surfaces and bottom surface of the housing are covered with the semiconductive layer.

7. The current transformer according to claim 1, characterized in that: The transformer body further includes a secondary connecting wire and a secondary terminal. One end of the secondary connecting wire is connected to the secondary coil, and the other end is connected to the secondary terminal. The secondary terminal is exposed from one side of the housing.

8. The current transformer according to claim 1, characterized in that: The shape of the socket matches the shape of the State Grid side expansion busbar connector on the cabinet.

9. The current transformer according to claim 3, characterized in that: The mounting plate is made of metal.

10. The current transformer according to claim 1, characterized in that: A buffer protection layer is wound around the primary coil and the secondary coil.

Images