CN217333830U - External current transformer - Google Patents

Abstract

The utility model provides an external current transformer, which comprises a cylinder body and a protective cover which is matched with the cylinder body to form a closed cavity, wherein a coil group is arranged in the closed cavity, and the coil group is glued on the outer peripheral surface and/or the bottom surface of the cylinder body; the method is characterized in that: the coil group is pressed on the bottom surface of the barrel along the axial direction of the barrel by the jacking component, and the jacking component is detachably assembled on the peripheral surface of the barrel. The utility model provides an external current transformer, roof pressure part compress tightly coil assembly in the axial of barrel for even the epoxy sizing material receives the impact after solidifying and breaks off, still can realize coil assembly relatively fixed in the axial of barrel through the effect that compresses tightly of roof pressure part, guarantee current transformer's normal operating and testing result's the degree of accuracy.

Description

External current transformer

Technical Field

The utility model relates to an external current transformer, concretely relates to fixed mode of coil among the current transformer.

Background

The current transformer is an important module on GIS equipment and is used for measuring and protecting a high-voltage line. The existing current transformers are divided into built-in current transformers and external current transformers. Because the coil of the external current transformer is positioned on the outer side of the barrel, the coil cannot influence the high potential field intensity in the barrel, and meanwhile, the external current transformer is more convenient to install, measure and maintain, so that the external current transformer is widely applied to a high-voltage switch.

At present, external current transformers are mainly divided into two types, one type is an assembled current transformer, and the other type is a pouring current transformer. The structure that the chinese utility model patent that the assembled current transformer adopted the grant publication number CN205621598U at present discloses, this current transformer mainly fixes the coil on barrel (the support housing in this patent promptly) through adjusting screw and clamp plate, this current transformer mainly through set up the sealing strip between barrel and protection casing (the shell in this patent promptly), guarantee the sealed effect of overall structure, but this kind of seal structure's leakproofness is not good, and easy inefficacy, unsuitable use is in the equipment that requires higher to sealing performance. The pouring type current transformer adopts a structure disclosed in the Chinese utility model patent with the publication number of CN213400759U at present, and the coil assembly (comprising at least one coil) and the cylinder body are solidified into a whole through epoxy resin sizing material, so that better sealing performance is ensured. However, the epoxy resin sizing material is brittle after being solidified, and can break under the condition of being impacted by external force, and particularly in the transportation process of the current transformer, the coil group can generate relative motion in the axial direction of the cylinder under the action of inertia, so that the coil group generates axial displacement, and the measurement accuracy is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an external current transformer to the fragility is big and easily leads to the technical problem of coil along barrel axial float behind the coil atress after epoxy resin glue material solidifies among the solution prior art.

The utility model discloses external current transformer adopts following technical scheme in the china and foreign style:

the external current transformer comprises a cylinder and a protective cover which is matched with the cylinder to form a closed cavity, wherein a coil group is arranged in the closed cavity and is adhered to the peripheral surface and/or the bottom surface of the cylinder; the coil group is pressed on the bottom surface of the barrel along the axial direction of the barrel by the jacking component, and the jacking component is detachably assembled on the peripheral surface of the barrel.

Has the advantages that: the utility model provides an external current transformer is when the equipment, pull down protection casing and roof pressure part earlier, the coil assembly passes through the epoxy sizing material and glues on the barrel, then install the roof pressure part on the barrel, make the roof pressure part compress tightly the coil assembly in the axial of barrel, even make the epoxy sizing material receive the impact after solidifying and take place the fracture, still can realize the coil assembly relatively fixed in the axial of barrel through the effect of compressing tightly of roof pressure part, guarantee current transformer's normal operating and testing result's the degree of accuracy. The protective cover covers the barrel body, and the protective cover can protect the coil group and the jacking component from the outside.

Furthermore, the jacking component comprises a jacking part detachably assembled on the barrel through a pin shaft or a threaded fastener and a gasket positioned between the jacking part and the coil group.

Has the advantages that: because the current transformer corresponds to different coil groups in equipment with different voltage grades, the axial lengths of the different coil groups are different, after the jacking component is installed on the barrel, if a certain distance still exists between the jacking component and the coil, the distance can be compensated by plugging in the gasket, so that the jacking component jacks the coil through the gasket, the current transformer can correspondingly install the coil groups with different lengths, and the use range of the current transformer is enlarged.

Furthermore, the jacking part is assembled on the barrel body along the axial position in an adjustable mode.

Has the advantages that: when the coil group is closer to the jacking piece and the distance between the coil group and the jacking piece is smaller than the thickness of the gasket, the jacking piece can be adjusted in the axial position, so that the jacking piece jacks the coil group, and the application range of the current transformer is further enlarged.

Furthermore, the jacking part is provided with a long hole extending along the axial direction, the barrel body is correspondingly provided with a threaded hole, and the threaded fastener penetrates through the long hole and is screwed into the threaded hole.

Has the beneficial effects that: when the jacking part is adjusted along the axial direction, the jacking part only needs to be unscrewed, so that the jacking part slides along the direction of the long hole, the jacking part can be screwed down by the threaded fastener after sliding in place, the threaded fastener does not need to be dismounted, and the adjustment is very convenient.

Furthermore, the top pressure piece is arranged at least two at intervals along the circumference of the cylinder.

Has the advantages that: the jacking parts are arranged in the circumferential direction at intervals, so that jacking stress surfaces of the coil groups are increased, and a good jacking effect on the coil groups can be realized. And compared with an annular jacking part, the jacking part is separately arranged, and the installation is also more convenient.

Furthermore, each jacking part is provided with at least two pin shafts or threaded fasteners which are arranged at intervals.

Has the advantages that: at least two pin shafts or threaded fasteners which are arranged at intervals have a rotation stopping function on the jacking piece, and the jacking piece can be prevented from swinging around the pin shafts or the threaded fasteners, so that the jacking effect is influenced.

Furthermore, the jacking piece comprises a base body fixedly arranged on the barrel and a top plate used for jacking the coil, and the top plate is adjustably assembled on the side face, far away from the center of the barrel, of the base body.

Has the beneficial effects that: when the radial dimension of coil is great, the roof can keep away from the center of barrel through the bed hedgehopping of pedestal and arrange as far as possible for the roof pressure of roof to coil assembly is close to the center of coil assembly unilateral thickness direction as far as possible, realizes better roof pressure effect.

Further, the jacking component is assembled on the barrel body in an adjustable mode along the axial position.

Has the advantages that: the axial lengths of different coil groups are different, after the jacking component is installed on the barrel, if a certain distance still exists between the jacking component and the coil, the jacking component can be adjusted in the axial position, so that the jacking component is jacked on the coil group, the current transformer can be correspondingly provided with the coil groups with different lengths, and the use scene of the current transformer is enlarged.

Furthermore, the protective cover is provided with a radial convex annular bulge.

Has the advantages that: the thickness of the protective cover is generally about 3mm, certain error and deformation exist during processing, if size shortage exists during mounting of the protective cover, the corresponding size shortage can be made up through the annular protrusion, and meanwhile, residual stress caused by size error during mounting can be eliminated.

Furthermore, a respirator for communicating the inside and the outside of the closed cavity is arranged on the protective cover.

Has the beneficial effects that: when the current transformer operates, the coil can generate heat, so that the gas pressure in the protective cover is increased; the gas can be exhausted out of the closed cavity through the exhaler, so that the mechanical property of the protective cover is prevented from being influenced by overlarge internal pressure.

Drawings

Fig. 1 is a schematic structural diagram of an external current transformer provided by the present invention;

FIG. 2 is an enlarged view at A in FIG. 1;

FIG. 3 is a schematic view of the cartridge of FIG. 1;

FIG. 4 is a schematic view of the shield of FIG. 1;

fig. 5 is a schematic structural view of the pressing member of fig. 1.

Names of components corresponding to corresponding reference numerals in the drawings are:

1. a barrel; 11. an annular blocking edge; 12. a threaded mounting hole; 2. a coil assembly; 3. a jacking member; 31. pressing the surface; 32. a mounting surface; 33. a long hole; 4. a gasket; 5. a protective cover; 51. turning over the edge forwards; 52. turning over the edge; 53. a respirator; 54. an annular protrusion.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that, in the embodiments of the present invention, relational terms such as "first" and "second", and the like, which may be present in the embodiments, are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Also, terms such as "comprises," "comprising," or any other variation thereof, which may be present, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the appearances of the phrase "comprising an … …" or similar limitation may be present without necessarily excluding the presence of additional identical elements in the process, method, article, or apparatus that comprises the same elements.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.

In the description of the present invention, unless otherwise explicitly specified or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.

The present invention will be described in further detail with reference to examples.

The utility model discloses external current transformer's embodiment 1:

as shown in fig. 1 and 2, the external current transformer includes a cylinder 1 and a protective cover 5 covering the cylinder 1, a closed chamber is formed between the cylinder 1 and the protective cover 5, a coil assembly 2 and a pressing member are disposed in the closed chamber, wherein the coil assembly 2 is adhered to the cylinder 1, and the pressing member presses the coil assembly 2 in an axial direction of the cylinder 1 to prevent the coil assembly 2 from moving in the axial direction of the cylinder 1. For convenience, the axial direction of the cylinder 1 is set as the front-back direction, the radial direction of the cylinder 1 is the inner-outer direction, the side facing the center of the cylinder is "inner", and the side departing from the center of the cylinder is "outer".

Specifically, as shown in fig. 3, the front side of the cylinder 1 is the top of the cylinder 1, the rear side of the cylinder 1 is the bottom of the cylinder 1, an annular blocking edge 11 is arranged at the bottom of the cylinder 1, the annular blocking edge 11 forms the bottom surface of the cylinder 1, and the whole peripheral surface of the cylinder 1 is a cylindrical surface. The coaxial cover of the outer peripheral face of barrel 1 is equipped with coil group 2, coil group 2 includes a plurality of coils, bond together through epoxy glue stock between coil group 2 and the barrel 1, it is specific, the terminal surface of coil group 2 orientation barrel 1 bottom surface bonds through epoxy glue stock with annular fender between the edge 11, the inner peripheral surface of coil group 2 bonds through epoxy glue stock with the outer peripheral face of barrel 1, bond through epoxy glue stock between the adjacent coil, make barrel 1 and coil group 2 form a whole.

In this embodiment, the barrel 1 is provided with a pressing member, the pressing member is located on a side of the coil assembly 2 away from the bottom surface of the barrel 1, and the pressing member and the annular blocking edge 11 apply opposite pressing forces to the coil assembly 2 in the axial direction of the barrel 1, so that the coil assembly 2 cannot move in the axial direction of the barrel 1. Specifically, the jacking component comprises a jacking part 3 and a gasket 4, the jacking part 3 is structurally shown in fig. 5, the cross section of the jacking part 3 is U-shaped, the jacking part 3 comprises a horizontal mounting surface 32 and a vertical jacking surface 31, two long holes 33 are formed in the horizontal mounting surface 32, the length of each long hole 33 is 10mm, correspondingly, two threaded mounting holes 12 for mounting the same jacking part 3 are formed in the outer peripheral surface of the barrel 1, the two threaded mounting holes 12 are arranged at intervals along the circumferential direction of the barrel 1, bolts sequentially penetrate through the long holes 33 and the threaded mounting holes 12, the jacking part 3 is fixed on the barrel 1, and at the moment, the extending direction of the long holes 33 is consistent with the axial direction of the barrel 1. In this embodiment, four pressing members 3 are circumferentially installed on the barrel 1 at intervals, and the installation manner of the pressing members 3 is the same, which is not described herein again. The gasket 4 is an annular gasket 4, the thickness of the gasket 4 is 5mm, the gasket 4 is sleeved on the barrel 1 and is positioned between the jacking part 3 and the coil assembly 2, and the jacking surface 31 of the jacking part 3 jacks the coil assembly 2 through the gasket 4.

In this embodiment, the protective cover 5 is structured as shown in fig. 4, the thickness of the protective cover 5 is 3mm, the end portion of the protective cover 5 is provided with an annular turned edge, specifically, the front end of the protective cover 5 is provided with a front turned edge 51, the front turned edge 51 is turned inwards, the rear end of the protective cover 5 is provided with a rear turned edge 52, and the rear turned edge 52 is turned outwards. In addition, the shield 5 is provided with an annular projection 54 and a breather 53, the annular projection 54 extends along the circumferential direction of the shield 5 and is arranged in a protruding manner outwards in the radial direction of the shield 5, the annular projection 54 can eliminate the error of the dimension of the shield 5, and when the axial dimension of the shield 5 is smaller than the set value, the annular projection 54 is partially unfolded to make up the dimension; when the axial dimension of the shield 5 is greater than a set value, the annular projection 54 is arched outwards to compensate for this dimension. The breather 53 is used for communicating the closed chamber with the outside, and when the air pressure in the closed chamber is larger, the breather 53 can discharge the air, so that the normal air pressure in the closed chamber is ensured. In this embodiment, the protection cover 5 covers the barrel 1, the backward turned edge 52 of the protection cover 5 is connected with the annular blocking edge 11 of the barrel 1, and the forward turned edge 51 of the protection cover 5 is connected with the corresponding connecting structure on the outer peripheral surface of the barrel 1 to form a closed chamber with the barrel 1.

When the coil assembly is assembled, firstly, the coil assembly 2 is sleeved on the cylinder body 1, then epoxy resin sizing materials are poured, it is guaranteed that the epoxy resin sizing materials are fully filled between the outer peripheral surface and the bottom surface of the coil and between adjacent coils, after the epoxy resin sizing materials are solidified, the coil assembly 2 and the cylinder body 1 are solidified into a whole, the jacking part 3 is installed on the outer peripheral surface of the cylinder body 1, if the distance between the jacking surface 31 of the jacking part 3 and the coil assembly 2 is smaller than 10mm, a bolt for fixing the jacking part 3 is unscrewed, the jacking part 3 slides towards the coil assembly 2 along the axial direction of the cylinder body 1, and the jacking surface 31 of the jacking part 3 is jacked on the coil assembly 2. If the distance between the top pressing surface 31 of the top pressing piece 3 and the coil assembly 2 is greater than 10mm, and the adjustment range of the long hole 33 is exceeded, a proper number of gaskets 4 need to be installed between the top pressing piece 3 and the coil assembly 2, so that the distance between the top pressing piece 3 and the adjacent gasket 4 is smaller than 10mm, the top pressing piece 3 is adjusted to enable the top pressing surface 31 of the top pressing piece 3 to be pressed on the gasket 4, the coil assembly 2 is fixed, and then the protective cover 5 is sleeved on the barrel 1 to cover the coil assembly 2 and the top pressing part. Since the protective cover 5 is thin and has a certain error and deformation during processing, there may be a dimension shortage in the axial direction when the protective cover 5 is installed, and at this time, it is only necessary to properly stretch the annular protrusion 54 to make up for the shortage, it should be specifically noted that the relevant dimensions of the long hole 33, the gasket 4 and the protective cover 5 can be set by self according to the needs, and the dimensions in this embodiment are only for reference and are not limited.

The utility model discloses external current transformer's embodiment 2:

the present embodiment is different from embodiment 1 in that, in embodiment 1, the pressing member includes a pressing member and a gasket. In the present embodiment, the pressing member includes only the pressing member, and does not include the gasket.

The utility model discloses external current transformer's embodiment 3:

the present embodiment is different from embodiment 1 in that in embodiment 1, the urging member is fixed to the cylinder by a bolt. In the embodiment, the jacking member is detachably mounted on the barrel through the pin shaft, and when the jacking member is detachably mounted on the barrel through the pin shaft, the jacking member cannot be adjusted steplessly.

The utility model discloses external current transformer's embodiment 4:

the difference between this embodiment and embodiment 1 is that in embodiment 1, the pressing member is adjustably mounted on the cylinder body along the axial direction through a long hole on the pressing member. In the embodiment, a plurality of mounting threaded holes or pin holes are formed in the outer peripheral surface of the cylinder body and are arranged at intervals along the axial direction of the cylinder body, and the jacking piece can be mounted by selecting the corresponding mounting threaded holes or pin holes according to actual conditions, so that stepped adjustable assembly of the jacking piece can be realized. In other embodiments, the jacking member can be fixedly assembled on the barrel, and the axial position is not adjustable, and at the moment, jacking of the coil assembly is realized by changing the number of the gaskets and selecting gaskets with different thicknesses; alternatively, the spacer may be eliminated when the current transformer is adapted to a single specification.

The utility model discloses external current transformer's embodiment 5:

the present embodiment is different from embodiment 1 in that four pressing members are installed at intervals in the circumferential direction of the cylinder in embodiment 1. In this embodiment, three pressing members are installed on the circumference of the cylinder. In other embodiments, the number of the pressing members may be other, and in order to ensure a better pressing effect, the number of the pressing members is preferably more than two. In other embodiments, the pressing member may also be an annular structure.

The utility model discloses external current transformer's embodiment 6:

the present embodiment is different from embodiment 1 in that in embodiment 1, the urging member is fastened by two bolts arranged at intervals. In the embodiment, the jacking member is only fastened by one bolt. In other embodiments, the number of the bolts for fixing the jacking member can be set by itself.

The utility model discloses external current transformer's embodiment 7:

the present embodiment is different from embodiment 1 in that, in embodiment 1, the pressing member includes a pressing member and a gasket. In this embodiment, the pressing member includes a seat body and a top plate, the seat body is fixedly mounted on the outer circumferential surface of the barrel, a threaded mounting hole is formed in a side surface of the seat body away from the center of the barrel, the top plate includes a mounting surface and a pressing surface, a long hole is formed in the mounting surface, the top plate is adjustably mounted on the side surface of the seat body away from the center of the barrel, and the top plate can be adjusted in the axial direction of the barrel to press the coil.

The utility model discloses external current transformer's embodiment 8:

the present embodiment is different from embodiment 1 in that, in embodiment 1, the coil group includes a plurality of coils. In this embodiment, the coil assembly includes only one coil.

The utility model discloses external current transformer's embodiment 9:

the present embodiment is different from embodiment 1 in that in embodiment 1, the spacer is a circular spacer. In this embodiment, the gasket is an arc gasket. The shim may also be of other shapes in other embodiments, such as a rectangular shim.

The utility model discloses external current transformer's embodiment 10:

the difference between the embodiment and the embodiment 1 is that in the embodiment 1, the protective cover is provided with an annular bulge. In this embodiment, the protective cover is no longer provided with the annular protrusion.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An external current transformer comprises a cylinder body (1) and a protective cover (5) matched with the cylinder body (1) to form a closed cavity, wherein a coil group (2) is arranged in the closed cavity, and the coil group (2) is adhered to the peripheral surface and/or the bottom surface of the cylinder body (1); the method is characterized in that: the coil winding device is characterized in that a jacking component is further arranged on the barrel body (1), the jacking component enables the coil assembly (2) to be jacked on the bottom surface of the barrel body (1) along the axial direction of the barrel body (1), and the jacking component is detachably assembled on the outer peripheral surface of the barrel body (1).

2. The external current transformer of claim 1, wherein: the jacking component comprises a jacking piece (3) detachably assembled on the barrel body (1) through a pin shaft or a threaded fastener and a gasket (4) positioned between the jacking piece (3) and the coil assembly (2).

3. The external current transformer of claim 2, wherein: the jacking piece (3) is assembled on the cylinder body (1) along the axial position in an adjustable manner.

4. The external current transformer of claim 3, wherein: the top pressing piece (3) is provided with a long hole (33) extending along the axial direction, the barrel body (1) is correspondingly provided with a threaded hole, and a threaded fastener penetrates through the long hole (33) and is screwed into the threaded hole.

5. The external current transformer according to any one of claims 2-4, wherein: at least two jacking pieces (3) are arranged at intervals along the circumferential direction of the barrel body (1).

6. The external current transformer of claim 5, wherein: and at least two pin shafts or threaded fasteners which are arranged at intervals are uniformly distributed on each jacking piece (3).

7. The external current transformer of claim 2, wherein: the jacking piece (3) comprises a base body fixedly arranged on the barrel body (1) and a top plate used for jacking the coil, and the top plate is adjustably assembled on the side face, far away from the center of the barrel body (1), in the base body.

8. The external current transformer of claim 1, wherein: the jacking component is assembled on the barrel body (1) in an adjustable mode along the axial position.

9. The external current transformer according to any one of claims 1 to 4, wherein: the protective cover (5) is provided with a radial outward convex annular bulge (54).

10. The external current transformer according to any one of claims 1 to 4, wherein: and the protective cover (5) is provided with a respirator (53) which is used for communicating the inside and the outside of the closed cavity.

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