Current transformer
By designing isolated cavities and shed structures that are not interconnected in the current transformer, the problems of poor insulation and safety hazards in the long-term operation of the current transformer are solved, and stronger insulation and heat dissipation effects are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2026-04-03
AI Technical Summary
Due to structural limitations, existing current transformers require the addition of insulating partitions to meet insulation withstand voltage requirements, but this poses safety hazards during long-term operation.
A current transformer was designed, which uses a first isolation cavity and a second isolation cavity that are not connected to each other for installing the incoming terminal and the outgoing terminal, respectively. Electrical isolation is achieved through these isolation cavities. The design combines a polyhedral structure and a skirt design to enhance insulation and heat dissipation.
It effectively improves the insulation and reliability of the incoming and outgoing terminals, reduces long-term safety hazards, and enhances heat dissipation through a polyhedral structure and umbrella skirt design.
Smart Images
Figure CN224082301U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electrical equipment, and in particular to a current transformer. Background Technology
[0002] Current transformers are essential electrical components in complete switchgear systems. Current transformers (e.g., 40.5kV specifications) are typically floor-mounted, with their high-voltage side far from the grounding electrode, and the incoming and outgoing terminals are usually led out with copper conductors. Currently, due to structural and dimensional limitations, conventional switchgear (e.g., 40.5kV specifications) requires the addition of insulating partitions between the conductors of the three-phase current transformers to meet insulation withstand voltage requirements. However, adding insulating partitions only guarantees short-term insulation performance, posing safety hazards in long-term operation. Utility Model Content
[0003] In order to overcome at least one of the defects described in the prior art, the present invention provides a current transformer to solve the problem of poor insulation of insulating boards during long-term use.
[0004] The technical solution adopted by this utility model to solve its problem is:
[0005] A current transformer includes a transformer body and an inlet terminal and an outlet terminal, both disposed within the transformer body and electrically connected to each other.
[0006] The transformer body is provided with a first isolation cavity and a second isolation cavity that are not connected to each other. The incoming terminal is located in the first isolation cavity and is electrically isolated through the first isolation cavity. The outgoing terminal is located in the second isolation cavity and is electrically isolated through the second isolation cavity. The incoming terminal and the outgoing terminal are respectively connected to the transformer body.
[0007] Furthermore, the transformer body is a polyhedron including a first mounting surface and a second mounting surface, the first mounting surface and the second mounting surface are intersecting, the first isolation cavity is disposed on the first mounting surface, and the second isolation cavity is disposed on the second mounting surface.
[0008] Furthermore, the first mounting surface and the second mounting surface are perpendicular to each other.
[0009] Furthermore, the transformer body is provided with three first enclosure plates, and the three first enclosure plates enclose to form the first isolation cavity;
[0010] The transformer body is provided with three second enclosure plates, which together form the second isolation cavity.
[0011] Furthermore, a first umbrella skirt is provided on the inner wall of the first enclosure panel.
[0012] Furthermore, a second umbrella skirt is provided on both the outer and inner walls of the second enclosure panel;
[0013] Alternatively, a second umbrella skirt is provided on both the outer and inner walls of the second enclosure panel, and the extension direction of the second umbrella skirt on the outer wall of the second enclosure panel and the extension direction of the second umbrella skirt on the inner wall of the second enclosure panel are perpendicular to each other.
[0014] Furthermore, it also includes a central plate, which is disposed in the middle of the transformer body and separates the first isolation cavity and the second isolation cavity;
[0015] The central plate is provided with a central support surface for installation and fixation, and the transformer body is externally connected to an external terminal, which is disposed on the central support surface.
[0016] Furthermore, at least two mounting holes are provided on the central support surface, and nesting is provided in the mounting holes.
[0017] Furthermore, the length direction of the first isolation cavity is the first direction, and the length direction of the second isolation cavity is the second direction; the first direction and the second direction are in the same direction.
[0018] Furthermore, the projections of the first isolation cavity and the second isolation cavity in the thickness direction of the center plate are both within the projection range of the center plate.
[0019] In summary, the current transformer provided by this utility model has the following technical effects:
[0020] The transformer body is provided with a first isolation cavity for installing the incoming terminal and a second isolation cavity for installing the outgoing terminal. In this way, the first and second isolation cavities effectively isolate the incoming and outgoing terminals. The first and second isolation cavities directly provided on the transformer body have stronger reliability and are more conducive to long-term insulation operation. In addition, the first and second isolation cavities can form a chamber-like enclosed barrier for the incoming and outgoing terminals, respectively, providing insulation and protection over a wider range. Attached Figure Description
[0021] Figure 1 This is a perspective view of the current transformer according to an embodiment of the present utility model;
[0022] Figure 2 This is a front view of the current transformer according to an embodiment of the present invention;
[0023] Figure 3 for Figure 1 Top view of the current transformer shown;
[0024] Figure 4 for Figure 1 The left view of the current transformer shown;
[0025] Figure 5 This is a cross-sectional view of the current transformer according to an embodiment of the present invention.
[0026] The meanings of the reference numerals in the attached figures are as follows:
[0027] 10. Current transformer body; 101. First isolation chamber; 102. Second isolation chamber; 11. Incoming terminal; 12. Outgoing terminal; 111. First enclosure plate; 112. Second enclosure plate; 21. First umbrella skirt; 22. Second umbrella skirt; 30. Central plate; 31. Central support surface; 40. External terminal; 50. Nesting. Detailed Implementation
[0028] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.
[0029] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
[0031] Current transformers convert high current to low current and can be used for current measurement, circuit protection, and electrical isolation. They are suitable for various electrical devices, such as common switchgear.
[0032] See Figures 1 to 5 This utility model discloses a current transformer, including a transformer body 10 and an inlet terminal 11 and an outlet terminal 12, which are both disposed in the transformer body 10 and electrically connected to each other.
[0033] The transformer body 10 is provided with a first isolation cavity 101 and a second isolation cavity 102 that are not connected to each other. The incoming terminal 11 is located in the first isolation cavity 101 and is electrically isolated through the first isolation cavity. The outgoing terminal 12 is located in the second isolation cavity 102 and is electrically isolated through the second isolation cavity. The incoming terminal 11 and the outgoing terminal 12 are respectively connected to the transformer body 10.
[0034] Specifically, the incoming terminal 11 located in the first isolation chamber 101 and the outgoing terminal 12 located in the second isolation chamber 102 are isolated separately to ensure the insulation requirements of the incoming terminal 11 and the outgoing terminal 12.
[0035] The transformer body 10 is provided with a first isolation cavity 101 and a second isolation cavity 102. It should be understood that the two isolation cavities are not connected to each other. The incoming terminal 11 and the outgoing terminal are isolated by the first isolation cavity 101 and the second isolation cavity 102. Firstly, the first isolation cavity 101 and the second isolation cavity 102 play a role in insulation and isolation. Secondly, the first isolation cavity 101 and the second isolation cavity 102 are directly set on the transformer body 10, which has stronger structural reliability, is more suitable for long-term operation, and reduces safety hazards.
[0036] In addition, the internal current inductance circuit structure of the current transformer body 10 is all existing technology and will not be described in detail here; in particular, the internal components of the current transformer body 10 are fixed by filling with epoxy material.
[0037] Optionally, the transformer body 10 is a polyhedron including a first mounting surface and a second mounting surface, the first mounting surface and the second mounting surface are intersected, the first isolation cavity 101 is disposed on the first mounting surface, and the second isolation cavity 102 is disposed on the second mounting surface.
[0038] The aforementioned first isolation cavity 101 and second isolation cavity 102 can be optionally disposed on the same plane or the same end of the current transformer body 10. In this embodiment, the current transformer body 10 is a polyhedron, on which at least a first mounting surface for mounting the incoming terminal and a second mounting surface for mounting the outgoing terminal 12 are provided. In particular, the first mounting surface and the second mounting surface are intersecting, meaning that the first mounting surface and the second mounting surface form an angle between them. The specific angle can be selected according to requirements such as the orientation of the mounting surfaces, and is not limited here. Preferably, to improve the ease of installation of the incoming terminal 11 and the outgoing terminal 12, the first mounting surface and the second mounting surface are chosen to be planes. Importantly, the first isolation cavity 101 and the second isolation cavity 102 belong to different mounting surfaces, which effectively achieves a greater degree of physical isolation between the incoming terminal 11 and the outgoing terminal 12 in spatial position.
[0039] Optionally, the first mounting surface and the second mounting surface are perpendicular to each other.
[0040] In this embodiment, the first mounting surface and the second mounting surface are perpendicular to each other. This can be understood as the first mounting surface and the second mounting surface facing different directions. Moreover, the first mounting surface and the second mounting surface can be used as mounting surfaces in the horizontal or vertical direction. Their direction is convenient for the installation of terminals and beneficial to the overall structure of the transformer body 10, such as the incoming terminal 11 and the outgoing terminal 12. In this embodiment, the transformer body 10 is selected as a cuboid polyhedron or a triangular pyramid with right angles.
[0041] Optionally, three first enclosure plates 111 are provided on the transformer body 10, and the three first enclosure plates 111 enclose to form a first isolation cavity 101.
[0042] Three second enclosure plates 112 are provided on the transformer body 10, and the three second enclosure plates 112 enclose to form a second isolation cavity 102.
[0043] Firstly, regarding the first isolation cavity 101, taking three first enclosure plates 111 as an example, the three first enclosure plates 111 enclose and form a U-shaped first isolation cavity 101; similarly, taking three second enclosure plates 112 as an example, the three second enclosure plates 112 enclose and form a U-shaped second isolation cavity 102. Importantly, both the first isolation cavity 101 and the second isolation cavity 102 have one open side (the unenclosed side) with at least one open end (the unenclosed end), and the open sides of the first isolation cavity 101 and the second isolation cavity 102 are arranged opposite to each other; this open side and open end facilitate heat dissipation at each terminal.
[0044] Optionally, the inner wall of the first enclosure panel 111 is provided with a first umbrella skirt 21.
[0045] The first umbrella skirt 21 includes at least one elongated heat dissipation strip or elongated heat dissipation fin; when there are multiple first umbrella skirts 21, they can be arranged sequentially. The first umbrella skirt 21 can be used to increase the contact surface between the outer wall and the air, thereby enhancing the heat dissipation effect.
[0046] In addition, the aforementioned first umbrella skirt 21 may also be provided on the outer wall of the transformer body 10 and the outer wall of the first enclosure plate 111.
[0047] Optionally, a second umbrella skirt 22 is provided on both the outer and inner walls of the second enclosure panel 112.
[0048] Alternatively, a second umbrella skirt 22 may be provided on both the outer and inner walls of the second enclosure panel 112, with the extension direction of the second umbrella skirt 22 on the outer wall of the second enclosure panel 112 being perpendicular to the extension direction of the second umbrella skirt 22 on the inner wall of the second enclosure panel 112.
[0049] The second umbrella skirt 22 includes at least one elongated heat dissipation strip or elongated heat dissipation fin; multiple second umbrella skirts 22 can also be arranged sequentially to enhance the heat dissipation effect. Specifically, the length direction of each heat dissipation strip or elongated heat dissipation fin on the inner wall of the second enclosure 112 is perpendicular to the length direction of each heat dissipation strip or elongated heat dissipation fin on the outer wall of the second enclosure 112. This perpendicular arrangement is to stagger the inner and outer wall second umbrella skirts 22, thereby staggering the heat dissipation of the second enclosure 112 and enhancing the heat dissipation effect.
[0050] Alternatively, a first umbrella skirt 21 or a second umbrella skirt 22 may be installed on the outer wall of the transformer body 10.
[0051] Optionally, a central plate 30 is also included, which is disposed in the middle of the transformer body 10 and separates the first isolation chamber 101 and the second isolation chamber 102.
[0052] The central plate 30 is provided with a central support surface 31 for installation and fixing, and the transformer body 10 is externally connected to an external terminal 40, which is located on the central support surface 31.
[0053] Among them, the central plate 30 has a rectangular outline, see reference. Figure 1 Taking the height scheme of the rectangular current transformer body 10 as a reference, the central plate 30 is set at two-thirds of the height of the current transformer body 10, and then combined with... Figure 2 With the length direction of the central plate 30 as a reference, the center line of the length direction of the current transformer body 10 coincides with the center line of the length direction of the central plate 30, and the current transformer body 10 is located at the right end near the central plate 30.
[0054] refer to Figure 1 In this embodiment, the first enclosure plate 111 is disposed on the top of the transformer body 10 and above the central plate 30, and the second enclosure plate 112 is disposed on the side of the transformer body 10 and below the central plate 30. Specifically, the top of the second enclosure plate 112 is connected to the bottom surface of the central plate 30. Thus, the central plate 30 directly and completely separates the first isolation chamber 101 and the second isolation chamber 102. It should be noted that the open side of the first isolation chamber 101 is at the top, while the open side of the second isolation chamber 102 is at the bottom, and the ends of the first isolation chamber 101 and the second isolation chamber 102 away from the transformer body 10 are open ends, thereby ensuring heat dissipation of each isolation chamber.
[0055] In addition, in this embodiment, the top surface of the mounting plate 30 serves as the central support surface 31 for installation and fixation, and an external terminal 40 is provided on it. The external terminal 40 is connected to the current transformer body 10 to output various detection data inside the current transformer body 10. The function and connection method of the external terminal 40 itself are existing technologies and will not be described in detail here. The key point is that the central mounting plate 30 provides installation support for the external terminal 40, thereby improving the reliability of installation.
[0056] Optionally, at least two mounting holes are provided on the central support surface 31, and a nesting 50 is provided in the mounting holes.
[0057] Among them, reference Figure 2 The center plate 30 has mounting holes at its two diagonally opposite corners, and a nest 50 is provided in the mounting holes. Optionally, the nest 50 can be made of metal and is used to pass through fasteners to fix the center plate 30 to the external structure. Optionally, the rectangular center plate 30 may have mounting holes at three or four corners.
[0058] Optionally, the length direction of the first isolation cavity 101 is the first direction, and the length direction of the second isolation cavity 102 is the second direction.
[0059] The first direction and the second direction are in the same direction, or the first direction and the second direction are in the same direction, and the projections of the first isolation cavity 101 and the second isolation cavity 102 in the thickness direction of the center plate 30 are both within the projection range of the center plate 30.
[0060] Among them, see Figure 1 Both the first isolation cavity 101 and the second isolation cavity 102 extend horizontally and to the left. Alternatively, the projections of the first isolation cavity 101 and the second isolation cavity 102 in the height direction fall within the projection range of the central plate 30. In this way, the outlines of the three are merged by overlapping projections, which can minimize the space occupied by the three.
[0061] Furthermore, the projections of the centerlines of the first isolation cavity 101 and the second isolation cavity 102 along their length direction onto the height direction of the transformer body 10 coincide. For further details, see [link to relevant documentation]. Figure 3 The width of both the first isolation cavity 101 and the second isolation cavity 102 is not greater than the width of the transformer body 10. The above structural settings can effectively reduce the overall volume occupied by the current transformer.
[0062] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.
Claims
1. A current transformer comprising a transformer body (10) and a line-in terminal (11) and a line-out terminal (12) both arranged in the transformer body (10) and electrically connected with each other, characterized in that, the transformer body (10) is provided with a first isolation cavity (101) and a second isolation cavity (102) which are not communicated with each other, the line-in terminal (11) is arranged in the first isolation cavity (101) and electrically isolated by the first isolation cavity, the line-out terminal (12) is arranged in the second isolation cavity (102) and electrically isolated by the second isolation cavity, and the line-in terminal (11) and the line-out terminal (12) are respectively connected to the transformer body (10).
2. The current transformer of claim 1, wherein, the transformer body (10) is a polyhedron comprising a first mounting surface and a second mounting surface, the first mounting surface and the second mounting surface are arranged intersecting each other, the first isolation cavity (101) is arranged on the first mounting surface, and the second isolation cavity (102) is arranged on the second mounting surface.
3. The current transformer of claim 2, wherein, the first mounting surface and the second mounting surface are perpendicular to each other.
4. The current transformer according to any one of claims 1-3, characterized in that, three first enclosure plates (111) are arranged on the transformer body (10), and the three first enclosure plates (111) enclose the first isolation cavity (101). three second enclosure plates (112) are arranged on the transformer body (10), and the three second enclosure plates (112) enclose the second isolation cavity (102).
5. The current transformer of claim 4, wherein, an inner wall of the first enclosure plate (111) is provided with a first umbrella skirt (21).
6. The current transformer of claim 4, wherein, an outer wall and an inner wall of the second enclosure plate (112) are both provided with a second umbrella skirt (22).
7. The current transformer of claim 6, wherein, an extension direction of the second umbrella skirt (22) on the outer wall of the second enclosure plate (112) and an extension direction of the second umbrella skirt (22) on the inner wall of the second enclosure plate (112) are perpendicular to each other.
8. The current transformer of claim 4, wherein, a middle plate (30) is further included, the middle plate (30) is arranged in a middle part of the transformer body (10), and the middle plate (30) separates the first isolation cavity (101) and the second isolation cavity (102). the middle plate (30) is provided with a middle support surface (31) for mounting and fixing, an external connection terminal (40) is circumscribed to the transformer body (10), and the external connection terminal (40) is arranged on the middle support surface (31).
9. The current transformer of claim 8, wherein, the middle support surface (31) is provided with at least two mounting holes, and a nest (50) is arranged in the mounting hole.
10. The current transformer of claim 8, wherein, a length direction of the first isolation cavity (101) is a first direction, a length direction of the second isolation cavity (102) is a second direction, and the first direction and the second direction are in the same direction.
11. The current transformer of claim 10, wherein, projections of the first isolation cavity (101) and the second isolation cavity (102) in a thickness direction of the middle plate (30) are both within a projection range of the middle plate (30).