Current transformer

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By arranging a positioning platform and a supporting member on the inner wall of the current transformer housing, the problems of the current transformer being too large in size and high in cost are solved, and a current transformer design with a simple structure, low cost and high stability is achieved.

CN223450636UActive Publication Date: 2025-10-17SIEMENS HIGH VOLTAGE SWITCHGEAR SHANGHAI

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Patent Information

Application Number: CN202422560735.1
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-10-22
Publication Date: 2025-10-17
Estimated Expiration: 2034-10-22

AI Technical Summary

Technical Problem

Traditional current transformers require a support tube to support the coil, which results in large size, complex structure and high cost.

Method used

Three or more positioning platforms are provided on the inner wall of the shell to support and position the coil, thereby reducing the additional space requirement in the shell. The positioning platforms and supporting members are used to form the iron core, thereby simplifying the structure.

Benefits of technology

The miniaturization of the current transformer is achieved, the manufacturing and installation costs are reduced, and the stability and force uniformity of the coil are improved.

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Abstract

The present application discloses a current transformer (1) comprising: an iron core (3) comprising a coil (31) and a support member for fixing the coil (31); the iron core (3) is used for containing and supporting the coil (31), the shell (2) is used for containing and supporting the iron core (3), a gap (G) is formed between the coil (31) and the inner wall of the shell (2), and three or more positioning tables (21) protruding inwards in the radial direction are arranged on the inner wall of the shell (2) in the circumferential direction and used for abutting against and supporting the coil (31) so as to position the coil (3) in the radial direction. The positioning table is formed on the inner wall of the shell in a protruding mode, the coil in the shell can be effectively supported and positioned, the positioning table is located in the gap between the shell and the coil, a space for containing the positioning table does not need to be additionally added in the shell, the size of the current transformer is reduced, the capacity of the coil can be made larger, and meanwhile the current transformer is simple in structure and convenient to use. And the manufacturing and mounting cost is reduced.

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Description

TECHNICAL FIELD

[0001] The present application relates to a current transformer for use in a gas insulated switchgear (GIS). BACKGROUND

[0002] In a conventional current transformer for a GIS, in order to prevent the coil from moving inside the housing, a support cylinder is required to be arranged inside the housing for supporting the coil at the center of the coil.

[0003] In order to ensure that there is sufficient gap insulation between the support cylinder and the live conductor inside the housing of the current transformer, the size of the current transformer needs to be designed to be very large, which makes the structure of the current transformer complex and causes high manufacturing and installation costs. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the present application proposes a current transformer, which overcomes the technical problem of the size of the current transformer being too large by arranging three or more positioning platforms on the inner wall of the housing for supporting and positioning the coil.

[0005] The current transformer according to the present application comprises: a core comprising a coil and a support member for fixing the coil; and a housing for accommodating and supporting the core, wherein there is a gap between the coil and the inner wall of the housing, and the inner wall of the housing is provided with three or more positioning platforms protruding radially inward in the circumferential direction for abutting and supporting the coil to position the coil in the radial direction.

[0006] By arranging three or more positioning platforms on the inner wall of the housing, the coil inside the housing can be supported and positioned, and the positioning platforms are located in the gap between the housing and the coil, without the need to additionally increase the space in the housing to accommodate the positioning platforms, thereby reducing the size of the current transformer, allowing the coil capacity to be larger, while the structure is simple and the manufacturing and installation costs are reduced.

[0007] Further, the number of positioning platforms is three, which further simplifies the structure of the housing and effectively reduces the cost.

[0008] Further, the three positioning platforms are uniformly arranged on the inner wall of the housing at an angle of 120°, which ensures that the coil is uniformly stressed and improves the stability of the support and positioning.

[0009] Further, the length of the positioning platforms in the axial direction of the housing is equal to the axial length of the housing, so that the positioning platforms can also support the coil in the entire axial length of the coil, ensuring that the coil is uniformly stressed.

[0010] Further, the top of the positioning platform has an arc-shaped recess for fitting with the coil, and the top is the radially inward free end of the positioning platform. This structure ensures that the coil is uniformly stressed.

[0011] Further, the positioning platform gradually decreases in size in the circumferential direction of the shell from a base of the positioning platform to a top of the positioning platform, the top being a radially inward free end of the positioning platform, and the base being a part of the positioning platform that is engaged with the inner wall of the shell. This structure reduces the material used to manufacture the shell, thereby reducing the manufacturing cost.

[0012] Further, the support member comprises a shielding ring arranged axially at the second side of the coil and having at least two through holes, a support flange arranged axially at the first side of the coil opposite to the second side and having at least two through holes, and a first threaded member passing through the through holes of the shielding ring and the support flange to fix the coil, the support flange and the shielding ring together to form the core. The core formed in this way is stable in structure, and can bear its own weight without deformation or damage when the current transformer is placed vertically, horizontally or obliquely.

[0013] Further, the support member comprises a shielding ring arranged axially at the second side of the coil and having at least two through holes, a support flange arranged axially at the first side of the coil opposite to the second side and having at least two through holes, and a first threaded member passing through the through holes of the shielding ring and the support flange to fix the coil, the support flange and the shielding ring together to form the core. The core formed in this way is stable in structure, and can bear its own weight without deformation or damage when the current transformer is placed vertically, horizontally or obliquely.

[0014] Further, the support flange is fixed together with the connecting flange at one end of the shell by a second threaded member, thereby fixing the core and the shell together to ensure the stability of the structure of the current transformer, and this connection method is simple in structure and reduces the cost.

[0015] Further, the current transformer comprises a first cover fixed together with the support flange and the connecting flange by a second threaded member to close the first side of the shell, and a second cover located at the second side of the shell opposite to the first side to close the second side. The current transformer comprises the first cover, the shell, the core and the second cover, which is simple in structure, easy to install, manufacture and maintain. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application and are incorporated herein for a purpose of explanations of the present application and are not intended as an undue limitation to the present application. In the drawings:

[0017] Figure 1 is a side view of the current transformer according to the present application.

[0018] Figure 2 is a cross-sectional view taken along line A-A according to Figure 1 .

[0019] Figure 3 is a cross-sectional view taken along line B-B according to Figure 1 .

[0020] Figure 4 is a sectional view taken along line C-C of Figure 2

[0021] Figure 5 is a sectional view of another embodiment of a core of a current transformer according to the present application.

[0022] Wherein, the reference signs are as follows:

[0023] 1. A current transformer;

[0024] 2. A housing;

[0025] 21. A positioning platform;

[0026] 22. A connecting flange;

[0027] 3. A core;

[0028] 31. A coil;

[0029] 32. A shielding ring;

[0030] 33. A supporting flange;

[0031] 34. A first threaded member;

[0032] 35. A second threaded member;

[0033] 4. A first cover;

[0034] 41. A reducing flange;

[0035] 42. An insulating pot;

[0036] 5. An electrically conductive rod;

[0037] 6. An adhesive;

[0038] G. A gap. DETAILED DESCRIPTION

[0039] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with examples.

[0040] It should be noted that the terms used herein are only for describing specific examples, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation, device, component and / or a combination thereof.

[0041] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] As shown in the present application Figures 1 to 5 The current transformer 1 according to the present application is generally used in a gas insulated switchgear (GIS). The current transformer 1 comprises a core 3 including a coil 31 and a support member for fixing the coil 31, and a housing 2 for accommodating and supporting the core 3, a gap G being provided between the coil 31 and the inner wall of the housing 2, the inner wall of the housing 2 being provided with three or more positioning platforms 21 protruding radially inward in the circumferential direction for abutting and supporting the coil 31 to position the coil 31 in the radial direction.

[0043] The three or more positioning platforms 21 are protruded on the inner wall of the housing 2, which can effectively support and position the coil 31 inside the housing 2, and the positioning platforms 21 are located in the gap G existing between the housing 2 and the coil 31, without the need to additionally increase the space in the housing 2 to accommodate the positioning platforms 21, thereby reducing the design size of the current transformer 1, allowing the coil 31 to have a larger capacity, while the structure is simple and the manufacturing and installation costs are reduced.

[0044] As shown in the present application Figure 1 and Figure 4 The number of positioning platforms 21 is three, and the three positioning platforms 21 are uniformly arranged at 120° on the inner wall of the housing 2.

[0045] In other embodiments, the number of positioning platforms 21 can be more than three, for example, four positioning platforms are uniformly arranged at 90° on the inner wall of the housing 2, and six positioning platforms are uniformly arranged at 60° on the inner wall of the housing 2. The present application does not limit the number of positioning platforms 21.

[0046] As shown in the present application Figure 3 The length of the positioning platform 21 in the axial direction of the housing 2 is equal to the axial length of the housing 2. That is, the positioning platform 21 extends through the entire axial length of the housing 2 in the axial direction of the housing 2. The positioning platform 21 can effectively support and position the coil 31 regardless of the position of the coil 31 arranged inside the housing 2, and can make the force acting on the coil 31 uniform.

[0047] The top of the positioning platform 21 can have a shape matching the outer surface of the coil 31. For example, the top of the positioning platform 21 can have an arc-shaped recess to fit the coil 31, thereby ensuring that the force acting on the coil 31 is uniform.

[0048] The size of the positioning platform 21 in the circumferential direction of the housing 2 gradually decreases from the base to the top of the positioning platform 21, which reduces the material used to manufacture the housing and reduces the manufacturing cost.

[0049] The top of the positioning table 21 is a radially inward free end of the positioning table 21, and the base of the positioning table 21 is a part of the positioning table 21 that is engaged with the inner wall of the shell 2.

[0050] As shown in the embodiments of the present application, Figure 2 The support member can include a shield ring 32 disposed axially at a second side of the coil, having at least two through holes; a support flange 33 disposed axially at a first side of the coil opposite to the second side, having at least two through holes; and a first threaded member 34 passing through the through holes of the shield ring 32 and the support flange 33, fixing the coil 31, the support flange 33 and the shield ring 32 together, thereby forming the core 3.

[0051] In this way, the core 3 is structurally stable, and can withstand its own weight without deformation or damage when the current transformer 1 is placed vertically, horizontally and obliquely.

[0052] According to another embodiment of the present application, as shown in Figure 5 The support member can include a shield ring 32 disposed axially at a second side of the coil 31, and a support flange 33 disposed axially at a first side of the coil 31 opposite to the second side, wherein the coil 31, the support flange 33 and the shield ring 32 are fixed together by an adhesive 6 to form the core 3. The adhesive 6 can be epoxy resin.

[0053] Unlike the shield ring 32, the coil 31 and the support flange 33 being fixed together by at least two threaded members (e.g. a screw rod and a nut) to form the core 3 as shown in Figures 1 to 4 In the embodiment shown in Figure 5 The way of forming the core 3 by the adhesive makes the core 3 simple in structure, easy to manufacture and low in cost.

[0054] In addition, the core 3 can include a plurality of coils 31, which can be fixed between the support flange 33 and the shield ring 32 by the first threaded member 34, or can be fixed together and between the support flange 33 and the shield ring 32 by the above-mentioned adhesive 6.

[0055] As shown in Figure 2 The support flange 33 is fixed together with the connecting flange 22 at one end of the shell 2 by a second threaded member 35.

[0056] The current transformer 1 according to the present application further comprises a first cover 4 fixed together with the support flange 33 and the connecting flange 22 by the second threaded members 35, for closing the first side of the housing 2; and a second cover (not shown in the drawings) located at the second side of the housing 2 opposite to the first side, for closing the second side.

[0057] Further, the first cover 4 can comprise a reducing flange 41 and an insulating pot 42. The reducing flange 41 has a plurality of through holes, and is fixed together with the connecting flange 22 and the support flange 33 by a plurality of threaded members. The reducing flange 41 is tapered from the side connected with the support flange 33 to the opposite side. The insulating pot 42 is arranged at the opposite side of the reducing flange 41.

[0058] The second cover has the same or similar structure as the first cover 4, and is fixed to the second side of the housing 2 by a plurality of threaded members. The second cover also has a corresponding reducing flange and an insulating pot.

[0059] The current transformer 1 according to the present application further comprises a conductive rod 5 passing through the center of the core 3.

[0060] In summary, the current transformer according to the present application effectively supports and positions the coil in the housing by three or more positioning platforms, eliminating the built-in support cylinder to support the coil. And the positioning platforms are located in the gap between the housing and the coil, without the need to additionally increase the space in the housing to accommodate the positioning platforms, reducing the size of the current transformer, allowing the coil capacity to be larger, while the structure is simple, reducing the manufacturing and installation costs.

[0061] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A current transformer, characterized in that: The current transformer (1) comprises: an iron core (3) comprising a coil (31) and a support member for fixing the coil (31); and A housing (2) is used to accommodate and support the iron core (3), and a gap (G) is provided between the coil (31) and the inner wall of the housing (2). The inner wall of the housing (2) is circumferentially provided with three or more positioning platforms (21) protruding radially inward, for abutting and supporting the coil (31) so as to position the coil (31) in the radial direction.

2. The current transformer according to claim 1, characterized in that: The number of the positioning platforms (21) is three.

3. The current transformer according to claim 2, characterized in that: The three positioning platforms (21) are evenly arranged at 120° on the inner wall of the housing (2).

4. The current transformer according to claim 1, characterized in that: The length of the positioning platform (21) in the axial direction of the housing (2) is equal to the axial length of the housing (2).

5. The current transformer according to claim 1, characterized in that: The top of the positioning platform (21) has an arc-shaped recessed portion so as to fit with the coil (31), and the top is a radially inward free end portion of the positioning platform (21).

6. The current transformer according to claim 1, characterized in that: The size of the positioning platform (21) in the circumferential direction of the housing (2) gradually decreases from the base to the top of the positioning platform (21), the top being the radially inward free end of the positioning platform (21), and the base being the portion where the positioning platform (21) engages with the inner wall of the housing (2).

7. The current transformer according to claim 1, characterized in that: The support member comprises: A shielding ring (32) is axially arranged at the second side of the coil and has at least two through holes; a supporting flange (33) axially disposed at a first side of the coil opposite to the second side and having at least two through holes; and A first screw member (34) passes through the through holes of the shielding ring (32) and the supporting flange (33) to fix the coil (31), the supporting flange (33) and the shielding ring (32) together, thereby forming the iron core (3).

8. The current transformer according to claim 1, characterized in that: The support member comprises: a shielding ring (32) axially disposed at a second side of the coil, and a supporting flange (33) axially arranged at a first side of the coil opposite to the second side, The coil (31), the supporting flange (33) and the shielding ring (32) are fixed together by an adhesive (6) to form the iron core (3).

9. The current transformer according to claim 7 or 8, characterized in that: The supporting flange (33) is fixed to the connecting flange (22) at one end of the housing (2) via a second screw member (35).

10. The current transformer according to claim 9, characterized in that: The current transformer (1) comprises: a first covering member (4) fixed to the supporting flange (33) and the connecting flange (22) by the second threaded member (35) for closing the first side of the housing (2); and A second cover is located at a second side of the housing (2) opposite to the first side, and is used to close the second side.