CN213366361U

CN213366361U - Voltage transformer and electrical cabinet

Info

Publication number: CN213366361U
Application number: CN202022805437.6U
Authority: CN
Inventors: 杨东锋; 曾庆鹏; 刘剑; 杨兵兵; 符祥强
Original assignee: ABB Schweiz AG
Current assignee: ABB Schweiz AG
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-06-04
Anticipated expiration: 2030-11-26
Also published as: DE202021100335U1

Abstract

Embodiments of the present disclosure relate to a voltage transformer and an electrical cabinet. The voltage transformer includes a housing, a fuse, a plug, a fuse cover, and a shield assembly. The fuse is at least partially disposed within the housing and is adapted to blow when a current in the fuse exceeds a predetermined value. The plug is cylindrical and hollow, extends outward from the housing in an axial direction, and is adapted to couple with an external wire. The fuse cover is disposed inside the plug and extends in an axial direction. The fuse cover includes a cover body and a cavity. The cap body includes opposing first and second ends, the first end adapted to couple to a fuse. The cavity extends from the second end in an axial direction toward an interior of the cap body, the cavity adapted to receive a conductor of an external wire when the plug is coupled with the external wire. The shield assembly is comprised of one or more shields that are arranged coaxially with the plug. According to the embodiment of the disclosure, the structure of the voltage transformer can be effectively simplified, thereby reducing the cost of manufacturing and maintenance.

Description

Voltage transformer and electrical cabinet

Technical Field

Embodiments of the present disclosure generally relate to the electrical field, and more particularly, to a voltage transformer and an electrical cabinet.

Background

In the electrical field, a voltage transformer is an electrical device for performing voltage conversion. The circuit to which the voltage transformer is coupled may fluctuate, which may cause the voltage transformer to risk being burned out. Therefore, the fuse is arranged in the mutual inductor, and when a fault occurs, the fuse can be fused to protect the voltage mutual inductor, so that a serious safety accident is avoided. After the fuse is fused, the fuse needs to be replaced, and the voltage transformer is put into operation again. However, the size of the existing fused voltage transformer is too large and the insulation risk is high, and the replacement of the fuse is very difficult.

SUMMERY OF THE UTILITY MODEL

Some methods have been proposed to protect the voltage transformer, such as adding a fuse structure in the voltage transformer. For example, in chinese patent CN 208954779U, a fused voltage transformer for gas-filled cabinets is proposed. In such a voltage transformer, a metal terminal for achieving electrical contact is provided on one side of the voltage transformer, and a cable plug for insulation is provided on the other side of the voltage transformer. Such a structure results in numerous parts and makes the structure of the voltage transformer complicated. The voltage transformer adopting the structure has higher requirements on installation space, is difficult to adapt to smaller electrical cabinets, and has limited application scenes. In addition, the structure is complex, so that the manufacturing and maintenance costs are high, and the popularization is greatly limited.

Embodiments of the present disclosure provide a voltage transformer and a corresponding electrical cabinet, which are intended to solve the above and/or other potential problems in the existing solutions.

In a first aspect, embodiments of the present disclosure provide a voltage transformer. This voltage transformer includes: a housing; a fuse disposed at least partially within the housing and adapted to blow when a current in the fuse exceeds a predetermined value; a plug having a cylindrical shape and being hollow, the plug extending outward from the housing in an axial direction and being adapted to be coupled with an external wire; a fuse cover disposed inside the plug and extending in an axial direction, the fuse cover including: a cover body including opposing first and second ends, wherein the first end is adapted to couple to a fuse; a cavity extending from the second end in an axial direction toward an interior of the cap body, the cavity adapted to receive a conductor of an external wire when the plug is coupled with the external wire; and a shield assembly consisting of one or more shields arranged coaxially with the plug.

According to the embodiment of the disclosure, the fuse cover can have the function of a cable plug in a traditional voltage transformer, so that the cable plug can be omitted. In this way, not only can the cost of the electrical apparatus be effectively controlled, but the overall size of the apparatus can also be reduced.

In some embodiments, the cavity comprises: a first annular chamber provided on a side of the cover body away from the fuse and extending in an axial direction; and a second annular cavity extending from the first annular cavity in an axial direction towards the interior of the cap body, the diameter of the first annular cavity being greater than the diameter of the second annular cavity, wherein an elastic element is disposed within the second annular cavity, the elastic element being adapted to abut between the external wire and the fuse upon insertion of the external wire.

In some embodiments, the shield assembly further comprises a first shield disposed between an inner wall of the hollow plug and the fuse cover.

In some embodiments, the first shield is a hollow structure and has threads on an inner wall thereof, the fuse cover being coupled to the first shield via the threads.

In some embodiments, the fuse cover includes: an annular flange disposed on a side of the cap body away from the fuse, the annular flange having a diameter larger than a diameter of the cap body, and a plurality of grooves disposed on a side of the annular flange away from the fuse and extending in a radial direction of the annular flange, the plurality of grooves being adapted to receive an external tool to establish or release a threaded connection of the fuse cap with the first shield when the external tool is rotated about a circumferential direction of the annular flange.

In some embodiments, the voltage transformer further comprises: a fixing ring annularly disposed outside a circumferential direction of the fuse; and the shield assembly further includes a second shield having a cylindrical shape and coupled with the fuse by a fixing ring.

In some embodiments, the plug comprises: a first portion and a second portion disposed in an axial direction, wherein a diameter of the first portion is smaller than a diameter of the second portion such that a step is formed between the first portion and the second portion.

In some embodiments, the shield assembly further includes a third shield that is cylindrical and disposed adjacent the outer wall of the plug.

In some embodiments, the voltage transformer further comprises: an iron core disposed adjacent to the fuse; and a coil, at least a portion of which passes through the core.

In a second aspect, embodiments of the present disclosure are directed to an electrical cabinet. The electrical cabinet comprises the voltage transformer of the first aspect of the present disclosure.

Drawings

The above and other objects, features and advantages of the embodiments of the present disclosure will become more readily understood through the following detailed description with reference to the accompanying drawings. Various embodiments of the present disclosure will be described by way of example and not limitation in the accompanying drawings, in which:

fig. 1 illustrates a schematic perspective view of a voltage transformer according to an embodiment of the present disclosure showing electrical components located inside a high voltage electrical cabinet;

FIG. 2 shows a schematic front view of the voltage transformer of FIG. 1 showing external wires connected to the voltage transformer;

fig. 3 shows a schematic cross-sectional view of the voltage transformer in fig. 1;

FIG. 4 shows a plug of the voltage transformer of FIG. 1;

figure 5 shows a schematic cross-sectional view of the plug of figure 4;

FIG. 6 illustrates a cross-sectional view of a fuse cover according to an embodiment of the disclosure;

FIG. 7 shows a schematic perspective view of the fuse cover of FIG. 6; and

fig. 8 shows a schematic view of a shield according to an embodiment of the present disclosure.

Detailed Description

The principles of the present disclosure will now be described with reference to various exemplary embodiments shown in the drawings. It should be understood that these examples are described merely to enable those skilled in the art to better understand and further implement the present disclosure, and are not intended to limit the scope of the present disclosure in any way. It should be noted that where feasible, similar or identical reference numerals may be used in the figures and that similar or identical reference numerals may indicate similar or identical functions. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the invention described herein.

In describing embodiments of the present disclosure, the terms "include" and its derivatives should be interpreted as being open-ended, i.e., "including but not limited to. The term "based on" should be understood as "based at least in part on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions are also possible below.

As described above, in the conventional scheme of the voltage transformer, a cable plug needs to be provided. However, the cable plugs are relatively expensive to manufacture, increasing the cost of the voltage transformer. The cable bulkhead also increases the overall size of the voltage transformer. Due to the cable plug, the structure of the voltage transformer becomes more complex, and more risk factors need to be controlled in the manufacturing process, which leads to the reduction of the factory yield of the voltage transformer. In addition, when the voltage transformer needs to be maintained, the cable plug always needs to be detached. Since the components are numerous in conventional solutions, the disassembly process becomes complicated and difficult to control.

Some illustrative implementations in accordance with embodiments of the disclosure are described below with reference to fig. 1-8.

Fig. 1 and 2 show a schematic perspective view and a front view, respectively, of a voltage transformer according to an embodiment of the present disclosure. As shown, the voltage transformer 1 generally includes a housing 10 and a plug 30 extending outwardly from the housing 10 in an axial direction a.

Fig. 3 shows a cross-sectional view of the voltage transformer 1 according to an embodiment of the present disclosure. As shown, the voltage transformer 1 includes a fuse 20 at least partially disposed within the housing 10, and the fuse 20 may be blown when a current in the fuse 20 exceeds a predetermined value, thereby functioning to protect the voltage transformer 1. In some embodiments, when the instantaneous current value in the fuse 20 exceeds a certain value, the fuse 20 will blow, so as to prevent the voltage transformer 1 from being burnt. As can also be seen in fig. 3, the plug 30 is cylindrical and of hollow construction, the plug 30 extending outwardly from the housing 10 in the axial direction a and being able to be coupled with the external wire 2.

Fig. 4 and 5 show a schematic perspective view and a cross-sectional view, respectively, of the plug 30 of the voltage transformer 1 in fig. 1. As can be seen, the fuse cover 40 is disposed inside the plug 30 and extends in the axial direction a. FIG. 6 shows a cross-sectional view of a fuse cover 1 according to an embodiment of the disclosure. The fuse cover 40 generally includes a cover body 41 and a cavity 42. The cap body 1 includes opposite first and second ends 411, 412, wherein the first end 411 is adapted to be coupled to the fuse 20. The cavity 42 extends from the second end 412 in the axial direction a toward the interior of the cap body 41. Referring back to fig. 2, when the plug 30 is coupled with the external wire 2, the cavity 42 can accommodate the conductor of the external wire 2, thereby achieving the electrical connection of the external wire 2 with the voltage transformer 1. It is to be understood that fig. 2 shows a schematic connection of the external wire 2 to the voltage transformer 1. The external wires 2 can be connected to the plug 30 of the voltage transformer 1 via a socket at the end thereof. In some embodiments, a spring may be provided within the plug 30 to assist the connection between the socket of the external wire 2 and the plug 30 of the voltage transformer 1. The spring can not only realize the conduction between the external wire 2 and the voltage transformer 1, but also realize the flexible connection between the external wire 2 and the voltage transformer 1, thereby ensuring the connection reliability.

As shown in fig. 5, the voltage transformer 1 further comprises a shielding assembly consisting of one or more shields. These shields are arranged coaxially with the plug 30 and provide good electrical performance for the voltage transformer 1. In the embodiment of fig. 5, the shielding assembly may consist of three

shields

51, 52, 53. However, it should be understood that the shield assembly may be any combination of the three shields. That is, the shielding assembly according to the embodiment of the present disclosure may include only any one of the three shielding members, may include any two of the three shielding members, and may further include all three shielding members as shown in fig. 5. It should also be understood that the shield assembly may include a greater number of shields, such as four, five, or more shields, and the specific number of shields is not limited by the embodiments of the present disclosure.

According to the embodiment of the present disclosure, the fuse cover 40 may function to both protect the fuse 20 and to achieve coupling with the external wire 2. In addition, the fuse cover 40 may also facilitate the removal of the fuse 20 for maintenance by maintenance personnel. Accordingly, the fuse cover 40 according to an embodiment of the present disclosure may double as a cable stopper in a conventional voltage transformer. This makes it possible to eliminate the cable plug in the voltage transformer 1 according to the embodiment of the present disclosure. In this way, not only can the cost of the electrical apparatus be effectively controlled, but the overall size of the apparatus can also be reduced. Due to the smaller size, the voltage transformer 1 according to the embodiments of the present disclosure may be suitable for more applications that are inaccessible in conventional voltage transformers. This helps to further increase the applicability of the voltage transformer.

In addition, since a cable plug is no longer required to be provided in the voltage transformer 1, potential risk factors of the voltage transformer can be effectively controlled. In other words, in conventional solutions, the cable plug often has a safety risk of being unthreading, which increases the frequency of maintenance. In contrast, in the solution according to the embodiment of the present disclosure, the potential safety hazard caused by the cable plug can be eliminated, and once the potential safety hazard occurs, only the fuse cover 40 needs to be replaced by a single component.

In some embodiments, as shown in fig. 6, the cavity 42 may include a first annular cavity 421 and a second annular cavity 422 extending along the axial direction a, wherein the first annular cavity 421 is disposed on a side of the cover body 41 away from the fuse 20, and the second annular cavity 422 extends from the first annular cavity 421 to an interior of the cover body 41. As shown, the diameter D1 of the first annular cavity 421 can be larger than the diameter D2 of the second annular cavity 422, which can be conveniently configured to receive the outer wire 2.

In other embodiments, in conjunction with fig. 5, a resilient member 44 may be disposed within the second annular cavity 422. The elastic member 44 may abut between the external wire 2 and the fuse 20 when the external wire 2 is inserted, thereby achieving electrical connection of the external wire 2 and the fuse 20. When the voltage transformer 1 needs to be disassembled for maintenance, the compressed elastic element 44 can be bounced open to help the external wire 2 to be separated from the fuse 20, so that the maintenance personnel can quickly disassemble the plug 30 of the voltage transformer 1, thereby greatly improving the efficiency of maintenance.

As shown in fig. 5, in some embodiments, the voltage transformer 1 may further comprise a first shield 51. The first shield 51 may be disposed between the inner wall 35 of the header 30 and the fuse cover 40. In some embodiments, the first shield 51 may be a hollow aluminum tube. Of course, the material here is merely exemplary, and the first shield member 51 may be made of other metal than aluminum as long as the material can perform the predetermined function. The specific materials are not limited by the embodiments of the present disclosure. In this way, the first shield 51 can provide a good shielding effect for the high voltage part, whereby the components inside the voltage transformer 1 can be protected from the external electric field.

Fig. 8 shows a schematic view of a shield according to an embodiment of the present disclosure. In some embodiments, as shown, the first shield 51 may be a hollow structure and the inner wall 512 thereof has threads 513, by which threads 513 the fuse cover 40 may be coupled to the first shield 51. Thus, by providing the first shield member 51 in the plug 30 in a simple and firm manner, the electrical performance of the voltage transformer 1 can be improved without increasing the external size of the voltage transformer 1.

FIG. 7 shows a schematic perspective view of the fuse cover 40 of FIG. 6. As shown, in some embodiments, the fuse cover 40 may include an annular flange 43 and a plurality of grooves 413. The annular flange 43 is provided on the side of the lid main body 41 remote from the fusible link 20, and has a diameter D3 larger than the diameter D4 of the lid main body 41. In some embodiments, the annular flange 43 may include a threaded configuration to enable connection with the first shield 51. Of course, it is understood that in other embodiments, the annular flange 43 may also include other connection means that can perform the connection function, such as a snap connection, etc.

As shown in fig. 7, a plurality of grooves 413 are provided on a side of the annular flange 43 away from the fuse 20 and extend in the radial direction R of the annular flange 43. The plurality of grooves 413 are capable of receiving an external tool inserted by a user when it is desired to install or remove the fuse cover 40, thereby enabling or disabling the threaded connection of the fuse cover 40 to the first shield 51 as the external tool is rotated about the circumference of the annular flange 43.

In fig. 7, four channels 413 are shown, it being understood that such an arrangement is suitable for use with an external tool such as a phillips screwdriver. However, the number of grooves 413 may be other numbers, for example, only two grooves 413 arranged in a straight line may be provided, such an arrangement may be used for an external tool such as a straight screwdriver. The specific number of grooves 413 is not limited by embodiments of the present disclosure.

In some embodiments, as shown in fig. 5, the voltage transformer 1 may include a second shield 52 having a cylindrical shape radially outside the fuse 20, and the second shield 52 may be a shield serving as the fuse 20. As shown, a fixing ring 54 may be further annularly provided at a circumferential outer side of the fuse 20, and the second shield 52 may be coupled with the fuse 20 by the fixing ring 54. The retaining ring 54 may maintain the coaxiality of the second shield 52 with other shields within the voltage transformer 1. Such an arrangement helps to further increase the degree of homogenization of the electric field strength.

In some embodiments, the retaining ring 54 may be directly coupled to the fuse 20. In other embodiments, there may be a gap between the retaining ring 54 and the fuse 20. In other embodiments, the second shield 52 may take the form of a mesh. Of course, it should be understood that the mesh forms mentioned herein are merely illustrative and not restrictive. The specific shape is not limited by the embodiments of the present disclosure, and may be determined according to different needs of a user.

As shown in fig. 4 or 5, in some embodiments, plug 30 may include a first portion 31 and a second portion 32 disposed along axial direction a. The diameter D5 of the first section is smaller than the diameter D6 of the second section, such that a step 33 is formed between the first section 31 and the second section 32. In this way, the dimension of the plug 30 in a single direction can be prevented from being too long, which contributes to the improvement of the structural stability.

In an alternative embodiment, the voltage transformer 1 may further comprise a third shield 53. The third shield 53 is of generally cylindrical configuration and is adjacent the outer wall 321 of the second portion 32 of the header 30. The third shield 53 may be a shield serving as a low-voltage portion. In other embodiments, the third shield 53 may also provide ground protection for the voltage transformer 1. The third shield 53 may be secured to the first shield 51 and the second shield 52 by an insert. In this way, the voltage transformer 1 can be made to have better electrical performance.

In some embodiments, the third shield 53 takes the form of a mesh. Of course, it should be understood that the mesh forms mentioned herein are merely illustrative and not restrictive. The specific shape is not limited by the embodiments of the present disclosure, and may be determined according to different needs of a user. As shown in fig. 5, in some embodiments, the third shield 53 may be coaxially disposed with the first shield 51 and the second shield 52, and the three shields may also be coaxially disposed with the plug 30.

Referring back to fig. 3, in some embodiments, the voltage transformer 1 may further include a core 60 and a coil 70. The ferrite core 60 is disposed adjacent to the fuse 20, and at least a portion of the coil 70 passes through the ferrite core 60. In this way, the voltage transformer 1 is able to fulfill its intended function.

The embodiment of the disclosure also relates to an electrical cabinet. Such an electrical cabinet comprises a voltage transformer 1 according to the above description. In some embodiments, the electrical cabinet may be, for example, a switchgear cabinet.

The fuse cover 40 according to the embodiment of the present disclosure not only functions as a positioning function of the fuse cover of the conventional voltage transformer, but also functions as a cable stopper and a connector in the conventional voltage transformer. By this combination, the mounting manner of the fuse 20 is changed, and since the number of components in the voltage transformer 1 is reduced and the structure of the voltage transformer 1 is simplified, the material cost thereof can be effectively controlled.

Compared with the traditional mode, the voltage transformer 1 according to the embodiment of the disclosure has better mold universality, so that the voltage transformer 1 is suitable for products with different parameters, and the application range of the voltage transformer is improved. When the fuse 20 needs to be replaced, maintenance personnel can replace the fuse more conveniently due to the fact that the number of components in the voltage transformer 1 is reduced, and therefore the maintenance difficulty of the voltage transformer 1 can be reduced.

Although claims have been formulated in this application to particular combinations of features, it should be understood that the scope of the disclosure also includes any novel feature or any novel combination of features disclosed herein either explicitly or implicitly or any generalisation thereof, whether or not it relates to the same aspect as presently claimed in any claim.

Claims

1. A voltage transformer, comprising:

a housing (10);

a fuse wire (20) disposed at least partially within the housing (10) and adapted to blow when a current in the fuse wire (20) exceeds a predetermined value;

a plug (30) being cylindrical and hollow, the plug (30) extending outwardly from the housing (10) in an axial direction (A) and being adapted to be coupled with an external wire (2);

a fuse cover (40) disposed inside the plug (30) and extending in the axial direction (A), the fuse cover (40) comprising:

a cover body (41) comprising opposing first and second ends (411, 412), wherein the first end (411) is adapted to be coupled to the fuse (20);

a cavity (42) extending from the second end (412) towards the inside of the cap body (41) along the axial direction (A), the cavity (42) being adapted to accommodate a conductor of the external wire (2) when the plug (30) is coupled with the external wire (2); and

a shielding assembly consisting of one or more shields arranged coaxially with the plug (30).

2. The voltage transformer according to claim 1, characterized in that said cavity (42) comprises:

a first annular chamber (421) provided on a side of the cover body (41) remote from the fuse (20) and extending in the axial direction (A); and

a second annular cavity (422) extending from the first annular cavity (421) in the axial direction (A) towards the interior of the cap body (41), the diameter (D1) of the first annular cavity (421) being greater than the diameter (D2) of the second annular cavity (422),

wherein an elastic element (44) is arranged within the second annular cavity (422), the elastic element (44) being adapted to abut between the external wire (2) and the fuse (20) upon insertion of the external wire (2).

3. The voltage transformer of claim 1,

the shielding assembly includes a first shield (51), the first shield (51) being disposed between an inner wall (35) of the hollow plug (30) and the fuse cover (40).

4. The voltage transformer according to claim 3, characterized in that the first shield (51) is a hollow structure and its inner wall (512) has a thread (513), the fuse cover (40) being coupled to the first shield (51) via the thread (513).

5. The voltage transformer according to claim 4, characterized in that the fuse cover (40) comprises:

an annular flange (43) provided on a side of the cap body (41) away from the fuse (20), a diameter (D3) of the annular flange (43) being larger than a diameter (D4) of the cap body (41), and

a plurality of grooves (413) provided on a side of the annular flange (43) remote from the fuse (20) and extending in a radial direction (R) of the annular flange (43), the plurality of grooves (413) being adapted to receive an external tool to establish or release a threaded connection of the fuse cover (40) with the first shield (51) upon rotation of the external tool around a circumference of the annular flange (43).

6. The voltage transformer of claim 1, further comprising:

a fixing ring (54) annularly provided on the outer side in the circumferential direction of the fuse (20); and further comprising a second shield (52), the second shield (52) being cylindrical and coupled with the fuse (20) by a fixing ring (54).

7. The voltage transformer according to claim 1, characterized in that said plug (30) comprises:

a first portion (31) and a second portion (32) arranged along the axial direction (A), wherein a diameter (D5) of the first portion is smaller than a diameter (D6) of the second portion, such that a step (33) is formed between the first portion (31) and the second portion (32).

8. The voltage transformer of claim 1,

the shield assembly further comprises a third shield (53), the third shield (53) being cylindrical and being arranged adjacent to an outer wall (321) of the plug (30).

9. The voltage transformer of claim 1, further comprising:

a core (60) disposed adjacent to the fuse (20); and

a coil (70) having at least a portion passing through the core (60).

10. Electrical cabinet, characterized in that it comprises a voltage transformer according to any one of claims 1 to 9.