Dry-type high-voltage current transformer

Abstract

The utility model discloses a dry-type high-voltage current transformer which comprises a shell and an iron core, one end of the iron core is located in the shell, the other end of the iron core penetrates through the shell and then is exposed out of the shell, and the iron core is covered with an arranged umbrella skirt. The iron core penetrates through the umbrella skirt and then is in threaded connection with a protection piece, the protection piece rotates at the upper end of the iron core so that the protection piece can be fixed to the shell, and the outer portion of the protection piece is connected with a wiring terminal. The protection piece is in threaded fit with the upper end of the iron core, so that on one hand, the umbrella skirt can be fixed on the shell by screwing down the protection piece; on the other hand, the bolt on the side face of the wiring terminal directly acts on the protection piece, so that the end portion of the iron core can be protected through the protection piece so as to avoid damage to the end portion of the iron core, and on the basis, under the condition that the main body structure of the mutual inductor is not changed, the service life of the mutual inductor can be prolonged through protection of the protection piece; and the method is worthy of popularization and application.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a dry-type high-voltage current transformer. Background Art

[0002] Instrument transformers, also known as instrument transformers, are a general term for current transformers and voltage transformers. They can convert high voltage into low voltage and high current into low current, and are used for measurement or protection systems.

[0003] In the current transformer currently used, the iron core is directly connected to the terminal. Specifically, the bolts on the side of the terminal are pressed against the iron core to complete the fixation of the terminal. This method is easy to use, but in actual operation, the tightening of the bolts can easily cause the iron core to be compressed and deformed, affecting the service life of the equipment. Utility Model Content

[0004] The purpose of the utility model is to provide a dry-type high-voltage current transformer to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a dry-type high-voltage current transformer, comprising a shell and an iron core, one end of the iron core is located inside the shell, and the other end of the iron core is exposed outside the shell after passing through the shell, and is covered on the outside of the iron core by an umbrella skirt; the upper end of the iron core is threadedly connected with a protective member after passing through the umbrella skirt, and the protective member is rotated at the upper end of the iron core to fix the protective member on the shell or remove it from the shell; the outside of the protective member is connected to a terminal, and the current of the iron core is transmitted to the terminal through the protective member.

[0006] As a preferred technical solution of the utility model: the protection member comprises a pressing part pressed on the upper surface of the shed and a sleeve part sleeved outside the iron core, wherein the sleeve part is threadedly matched with the upper end of the iron core.

[0007] As a preferred technical solution of the utility model: an annular groove is further provided at the upper end of the sleeve part, and a retaining spring is provided to connect with the annular groove so as to fix the wiring terminal to the outside of the sleeve part.

[0008] As a preferred technical solution of the utility model: a sealing gasket is further provided on the upper wall surface of the umbrella skirt, and the sealing gasket is pressed onto the umbrella skirt by the protective member.

[0009] As a preferred technical solution of the utility model: a connecting piece is further provided on the outside of the protection piece, and the connecting piece is pressed onto the protection piece through the wiring terminal.

[0010] As a preferred technical solution of the utility model: the bottom of the umbrella skirt is connected to a support seat, and the support seat is fixed on the shell.

[0011] By adopting the above technical scheme, the beneficial effects of the utility model are as follows: by utilizing the cooperation between the protective member and the upper end thread of the iron core, the umbrella skirt can be fixed to the shell by tightening the protective member; secondly, the bolts on the side of the terminal directly act on the protective member, so the protective member can also be used to protect the end of the iron core, while avoiding damage to the end of the iron core and reducing the influence of dust and water vapor on the end of the iron core. Based on this, the utility model can extend the service life of the transformer through the protection of the protective member without changing the main structure of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0013] Figure 2 It is a partial exploded schematic diagram of the main structure of the utility model;

[0014] Figure 3 For this utility model Figure 3 A local enlarged schematic diagram of the middle A;

[0015] Figure 4 It is a schematic diagram of the main structure of the protective member of the utility model.

[0016] In the figure: 1. shell; 2. support seat; 3. umbrella skirt; 4. terminal; 5. connecting piece; 6. iron core; 7. sealing gasket; 8. protective piece; 9. retaining spring; 10. annular groove; 11. sleeve part; 12. clamping part. DETAILED DESCRIPTION

[0017] Embodiments of the present utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present utility model, and should not be construed as limitations on the present utility model. In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "upper surface", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model.

[0018] See also Figure 1-4The utility model provides an embodiment: a dry-type high-voltage current transformer, comprising a shell 1 and an iron core 6, one end of the iron core 6 is located inside the shell 1, and the other end of the iron core 6 is exposed outside the shell 1 after passing through the shell 1, and is covered on the outside of the iron core 6 by an umbrella skirt 3; the upper end of the iron core 6 is threadedly connected with a protective member 8 after passing through the umbrella skirt 3, and is rotated on the upper end of the iron core 6 by the protective member 8 to fix the protective member 8 on the shell 1 or remove it from the shell 1; the outside of the protective member 8 is connected with a terminal 4, and the current of the iron core 6 is transmitted to the terminal 4 through the protective member 8.

[0019] To sum up, the protective member 8 can be installed on the iron core 6 by rotating the protective member 8. After the protective member 8 is fixed to the iron core 6, the wiring terminal 4 is put on the protective member 8, and then the wiring terminal 4 is fixed to the protective member 8 by using the bolts on its side. Without affecting the smooth flow of the circuit, the force of the bolts can be transferred to the protective member 8 to reduce the damage to the iron core 6 caused during the tightening of the bolts. Based on this, the scheme can, on the one hand, fix the umbrella skirt 3 on the shell 1 by tightening the protective member 8; on the other hand, the bolts on the side of the wiring terminal 4 directly act on the protective member 8, so the protective member 8 can also be used to protect the end of the iron core 6. While avoiding damage to the end of the iron core 6, it can also reduce the influence of dust and water vapor on the end of the iron core 6. In addition, the device can also extend the service life of the transformer through the protection of the protective member 8 without changing the main structure of the transformer.

[0020] Specifically, the protective member 8 includes a pressing portion 12 pressed against the upper surface of the shed 3 and a sleeve portion 11 sleeved on the outside of the iron core 6. The sleeve portion 11 is threadedly matched with the upper end of the iron core 6. Therefore, the pressing portion 12 can be used to promote the protective member 8 to rotate on the iron core 6, while the inner bottom surface of the sleeve portion 11 is in contact with the upper end surface of the iron core 6, which can ensure the normal flow of current. In particular, the threads on the inner wall of the sleeve portion 11 and the external threads at the end of the iron core 6 are engaged with each other, which can ensure the reliability of the connection between the two and effectively reduce the occurrence of arcs.

[0021] In addition, since an annular groove 10 is also provided at the upper end of the sleeve portion 11, the terminal 4 is fixed to the outside of the sleeve portion 11 by connecting the retaining spring 9 to the annular groove 10. Therefore, the retaining spring 9 can be used to connect to the annular groove 10, and a bolt-free connection between the terminal 4 and the protective member 8 can be achieved, which not only improves the installation efficiency of the terminal 4, but also ensures the stability of the terminal 4 after connection. In particular, after the retaining spring 9 is connected to the annular groove 10, the terminal 4 can also rotate axially outside the protective member 8 to adapt to the swing of the cable and the rotation of the terminal 4 to facilitate the connection with the cable.

[0022] On the basis of the above solution, in order to prevent dust and water vapor from entering the interior of the shell 1 through the connection between the protective member 8 and the umbrella skirt 3, a sealing gasket 7 is further provided on the upper wall surface of the umbrella skirt 3, and the sealing gasket 7 is pressed onto the umbrella skirt 3 through the protective member 8.

[0023] Furthermore, since a connecting member 5 is also provided on the outside of the protective member 8, and the connecting member 5 is pressed onto the protective member 8 through the wiring terminal 4, the connecting member 5 can be used to improve the stability of both ends of the iron core 6. The specific structure of the connecting member 5 can refer to the prior art.

[0024] In addition, since the bottom of the umbrella skirt 3 is connected to the support seat 2, and the support seat 2 is fixed on the shell 1, the support seat 2 is used to avoid direct contact between the umbrella skirt 3 and the shell 1. At the same time, when the support seat 2 is made of rubber material, the insulation capacity of the iron core 6 and the shell 1 can be improved, and its softness can also be used to protect the bottom of the umbrella skirt 3.

[0025] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A dry-type high-voltage current transformer, characterized in that: It comprises a shell (1) and an iron core (6), one end of the iron core (6) being located inside the shell (1), and the other end of the iron core (6) being exposed outside the shell (1) after passing through the shell (1), and being covered on the outside of the iron core (6) by an umbrella skirt (3); The upper end of the iron core (6) passes through the shed (3) and is threadedly connected to a protective member (8), and the protective member (8) is rotated on the upper end of the iron core (6) to fix the protective member (8) on the housing (1) or remove the protective member (8) from the housing (1); The outside of the protection member (8) is connected to a provided connection terminal (4), and the current of the iron core (6) is transmitted to the connection terminal (4) through the protection member (8).

2. A dry-type high-voltage current transformer according to claim 1, characterized in that: The protective member (8) comprises a pressing portion (12) pressed against the upper surface of the shed (3) and a sleeve portion (11) sleeved on the outside of the iron core (6); wherein the sleeve portion (11) is threadedly matched with the upper end of the iron core (6).

3. A dry-type high-voltage current transformer according to claim 2, characterized in that: The upper end of the sleeve portion (11) is also provided with an annular groove (10), which is connected to the annular groove (10) via a provided clamping spring (9) so as to fix the connection terminal (4) outside the sleeve portion (11).

4. A dry-type high-voltage current transformer according to claim 1, 2 or 3, characterized in that: The upper wall surface of the umbrella skirt (3) is also provided with a sealing pad (7), and the sealing pad (7) is pressed onto the umbrella skirt (3) by the protective member (8).

5. A dry-type high-voltage current transformer according to claim 4, characterized in that: A connecting piece (5) is also provided on the outside of the protective piece (8), and the connecting piece (5) is pressed onto the protective piece (8) through the connecting terminal (4).

6. A dry-type high-voltage current transformer according to claim 5, characterized in that: The bottom of the umbrella skirt (3) is connected to a support base (2), and the support base (2) is fixed on the shell (1).

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