A current transformer with a shielded mesh

Abstract

The application relates to the technical field of mutual inductors, and discloses a current transformer with a shielding net, which comprises a shell, a plurality of insulating shells are arranged in the shell, an induction coil is sleeved on the insulating shells, insulating holes are arranged on the insulating shells, a conduit body is arranged in the insulating holes, the conduit body is used for inputting or outputting current, a shielding net is arranged on the outer surface of the conduit body, and the shielding net is used for reducing the gap between the conduit body and the insulating holes. The outer surface of the conduit body is provided with the shielding net, so that the shielding net can effectively reduce the assembly gap between the conduit body and the insulating holes, the risk of local discharge caused by electric field concentration is reduced, the uniform electric field distribution is realized through the shielding net, the stability of the whole current transformer is further improved, and the safety of the whole equipment is strengthened, thereby providing safety protection for the working environment of workers.

Description

Technical Field

[0001] This application relates to the technical field of current transformers, and in particular to a current transformer with a shielding mesh. Background Technology

[0002] A current transformer is a device used to measure and protect current in a power system. It converts large currents into small currents through the principle of electromagnetic induction, thereby converting high primary currents into electrical signals that are easy to measure and control. It can play the role of current conversion and electrical isolation, and is widely used in generators, motor regulation, and large factories, power plants and other occasions.

[0003] In related technologies, a current transformer includes a housing, inside which are provided multiple insulating shells, an induction coil is fitted on the insulating shell, an insulating hole is opened on the insulating shell, and a conduit is provided inside the insulating hole, the conduit being used for current input or output.

[0004] In actual operation, due to manufacturing processes, assembly tolerances, or material shrinkage, gaps inevitably exist between the conduit body and the insulation hole. These gaps may form local electric field concentrations. Under the action of a strong electric field, partial discharge is likely to occur. This partial discharge will cause the insulation performance of the equipment to decline, which may eventually lead to breakdown faults or even cause major safety hazards. Utility Model Content

[0005] To improve the safety of current transformers, this application provides a current transformer with a shielding mesh.

[0006] This application provides a current transformer with a shielding mesh, which adopts the following technical solution: A current transformer with a shielding mesh includes a housing, inside which are provided a plurality of insulating shells. An induction coil is fitted on the insulating shell. An insulating hole is provided on the insulating shell. A conduit is provided inside the insulating hole. The conduit is used to supply current input or output. A shielding mesh is provided on the outer surface of the conduit. The shielding mesh is used to reduce the gap between the conduit and the insulating hole.

[0007] By adopting the above technical solution, a shielding mesh is provided on the outer surface of the conduit body, which can effectively reduce the assembly gap between the conduit body and the insulation hole, reduce the risk of partial discharge caused by electric field concentration, and further improve the overall stability of the transformer by uniformly distributing the electric field through the shielding mesh, thereby strengthening the overall safety of the equipment and providing a safety guarantee for the working environment of the staff.

[0008] Optionally, the shielding mesh includes a first mesh surface and a second mesh surface, the second mesh surface being welded to the first mesh surface, the first mesh surface being welded to the conduit body, and the first mesh surface extending circumferentially along the conduit body.

[0009] By adopting the above technical solution, the second mesh surface is welded to the first mesh surface, and the first mesh surface is welded to the conduit body, so that the first mesh surface and the second mesh surface can be firmly installed on the outer surface of the conduit body. This makes it easier for staff to quickly and accurately install the shielding mesh, thereby reducing the occurrence of displacement or separation of the shielding mesh during use, and making the fixation between the shielding mesh and the conduit body more reliable.

[0010] Optionally, a reinforcing ring is provided on the first mesh surface, the reinforcing ring circumferentially surrounding the outer edge of the first mesh surface, the reinforcing ring being used to reinforce the first mesh surface.

[0011] By adopting the above technical solution, the reinforcing ring is circumferentially wrapped around the outer edge of the first mesh surface, which can reinforce the first mesh surface, effectively enhancing the overall structural rigidity and deformation resistance of the first mesh surface, thereby enhancing the stability and shielding performance of the first mesh surface structure, reducing the possibility of deformation of the first mesh surface, and thus extending the service life of the first mesh surface, further ensuring the safe operation of the current transformer.

[0012] Optionally, a fixing rod is fixedly connected to the inner surface of the reinforcing ring, and a fixing groove is provided on the guide tube for the fixing rod to be inserted. When the fixing rod is inserted into the fixing groove, the reinforcing ring and the guide tube are on the same axis.

[0013] By adopting the above technical solution, a fixing groove is provided on the guide tube for inserting the fixing rod. The worker first aligns the fixing rod and inserts it into the fixing groove to ensure that the reinforcing ring and the guide tube are on the same axis. This facilitates the worker in installing the first mesh surface and the reinforcing ring together, improves the installation efficiency of the worker in installing the reinforcing ring, and can improve the positioning accuracy and assembly consistency of the shielding mesh structure.

[0014] Optionally, the first mesh surface is provided with a positioning part, and the guide tube body is provided with a positioning groove for the positioning part to be inserted. When the positioning part is inserted into the positioning groove, the first mesh surface is fixed on the guide tube body.

[0015] By adopting the above technical solution, the positioning groove on the guide tube allows the positioning part to be inserted into the positioning groove, so that the first mesh surface and the guide tube can be fixed to each other. This allows the first mesh surface to be quickly fixed on the guide tube, thereby positioning the welding position of the first mesh surface. This makes it easier for the staff to weld the first mesh surface and the second mesh surface onto the guide tube, reducing the possibility of the first mesh surface shifting during the welding process.

[0016] Optionally, a guide slope is provided on the wall of the positioning groove. The distance from the guide slope to the groove axis gradually decreases along the direction in which the positioning part is inserted into the positioning groove. The guide slope is used to guide the positioning part into the positioning groove.

[0017] By adopting the above technical solution, the distance from the inclined plane to the groove axis gradually decreases along the direction in which the positioning part is inserted into the positioning groove, so that the positioning part can be inserted into the positioning groove more smoothly along the inclined plane. The workers can position the first mesh surface to facilitate the subsequent welding of the entire shielding mesh.

[0018] Optionally, the second mesh surface is provided with protrusions, and the positioning part is provided with through holes for the protrusions to be inserted. When the protrusions are inserted into the through holes, the positions where the first mesh surface and the second mesh surface need to be welded are positioned.

[0019] By adopting the above technical solution, the second mesh surface is positioned on the first mesh surface by having a through hole for inserting a protrusion on the positioning part. This eliminates the need for workers to fix the positions of the first and second mesh surfaces that need to be welded, thus facilitating subsequent welding steps.

[0020] Optionally, the second mesh surface is provided with a retaining ring, which surrounds the solder and is used for placing the solder.

[0021] By adopting the above technical solution, the second mesh surface is equipped with retaining rings, which can provide space for the position of the solder, allowing it to surround the predetermined welding position. Workers can first place the solder on the retaining rings and then weld the solder position. Workers can position the welding position, which facilitates the welding process, effectively restricts the flow of molten solder, ensures the consistency and reliability of the welding, and thus improves the overall assembly quality of the shielding mesh.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. By providing a shielding mesh on the outer surface of the conduit body, the shielding mesh can effectively reduce the assembly gap between the conduit body and the insulation hole, reduce the risk of partial discharge caused by electric field concentration, and at the same time, the uniform electric field distribution of the shielding mesh further improves the overall stability of the current transformer, thereby enhancing the overall safety of the equipment and providing a safe working environment for the staff.

[0023] 2. By welding the second mesh surface to the first mesh surface, and the first mesh surface to the conduit body, the first and second mesh surfaces can be firmly installed on the outer surface of the conduit body. This facilitates the quick and accurate installation of the shielding mesh by the staff, thereby reducing the occurrence of displacement or separation of the shielding mesh during use and making the fixation between the shielding mesh and the conduit body more reliable. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2This is a partial structural diagram highlighting the placement slot in an embodiment of this application; Figure 3 This is a schematic diagram highlighting a partial structure of the catheter in an embodiment of this application; Figure 4 This is an embodiment of the present application. Figure 3 Sectional view along line AA; Figure 5 This is an embodiment of the present application. Figure 4 Enlarged diagram of part B.

[0025] Reference numerals: 1. Outer shell; 11. Placement groove; 12. Insulating shell; 121. Insulating hole; 13. Induction coil; 2. Conduit body; 21. Fixing groove; 22. Positioning groove; 221. Guide slope; 3. Shielding mesh; 31. First mesh surface; 311. Positioning part; 312. Through hole; 32. Second mesh surface; 321. Protrusion; 322. Retaining ring; 33. Reinforcing ring; 331. Fixing rod. Detailed Implementation

[0026] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0027] This embodiment discloses a current transformer with a shielding mesh. (Refer to...) Figure 1 and Figure 2 A current transformer with a shielded mesh includes a housing 1, which is formed by casting epoxy resin. A placement groove 11 is formed inside the housing 1. Multiple insulating shells 12 are fixedly connected to the bottom wall of the placement groove 11, and the insulating shells 12 are arranged in an array along the length of the placement groove 11. An induction coil 13 is fitted onto the outer surface of the insulating shell 12, and the induction coil 13 is used to sense changes in current. An insulating hole 121 is formed on the surface of the insulating shell 12 away from the bottom wall of the placement groove 11. A conduit 2 is detachably connected to the insulating hole 121, and the conduit 2 is used for current input or output.

[0028] Reference Figure 3 A shielding mesh 3 is welded to the outer surface of the conduit body 2. The shielding mesh 3 is used to reduce the gap between the conduit body 2 and the insulating hole 121, thereby reducing the possibility of partial discharge. The shielding mesh 3 includes a first mesh surface 31 and a second mesh surface 32. The first mesh surface 31 is welded onto the second mesh surface 32. The first mesh surface 31 is annular and extends circumferentially along the conduit body 2. The second mesh surface 32 can cover the circumferential side of the conduit body 2. By connecting with the first mesh surface 31, it encloses the conduit body 2 to avoid air gap discharge and reduce the occurrence of partial discharge. The operator first sequentially puts the first mesh surface 31 and the second mesh surface 32 onto the conduit body 2, and then positions and welds the first mesh surface 31 and the second mesh surface 32 onto the conduit body 2 to fix the shielding mesh 3 and the conduit body 2.

[0029] Reference Figure 3 A reinforcing ring 33 is fixedly connected to the outer edge surface of the first mesh surface 31 away from the axis. The reinforcing ring 33 is circumferentially surrounded by the outer edge surface of the first mesh surface 31 at the farthest distance. The thickness of the reinforcing ring 33 is greater than the thickness of the first mesh surface 31. The reinforcing ring 33 is used to reinforce the first mesh surface 31.

[0030] Reference Figure 4 A fixing rod 331 is fixedly connected to the inner surface of the reinforcing ring 33.

[0031] Reference Figure 4 and Figure 5 The fixing rod 331 extends towards the guide tube 2, and a fixing groove 21 is provided on the outer surface of the guide tube 2 for the fixing rod 331 to be inserted. When the fixing rod 331 is inserted into the fixing groove 21, the reinforcing ring 33 and the guide tube 2 are on the same axis, which makes it easy for the staff to position the reinforcing ring 33 so that the reinforcing ring 33 can be installed on the first mesh surface 31.

[0032] Reference Figure 5 A positioning part 311 is fixedly connected to the surface of the first mesh surface 31 near the conduit body 2. A positioning groove 22 is provided on the outer surface of the conduit body 2 for the positioning part 311 to be inserted. When the positioning part 311 is inserted into the positioning groove 22, the positioning part 311 and the positioning groove 22 are engaged, and the first mesh surface 31 can be fixed on the conduit body 2. By positioning the first mesh surface 31, it is easier for the staff to weld the shielding mesh 3 onto the conduit body 2 later.

[0033] Reference Figure 5 The positioning groove 22 has guide slopes 221 on both sides of the groove wall opposite to each other along the diameter direction of the guide tube 2. The distance from the guide slope 221 to the groove axis gradually decreases along the direction in which the positioning part 311 is inserted into the positioning groove 22, so that the positioning part 311 can be inserted into the positioning groove 22 more smoothly along the inclined direction of the guide slope 221.

[0034] Reference Figure 5 On the surfaces of the second mesh surface 32 opposite to the conduit body 2, protrusions 321 are fixedly connected. On the surface of the positioning part 311 away from the conduit body 2, through holes 312 are provided for the protrusions 321 to be inserted. When the protrusions 321 are inserted into the through holes 312, the positions where the first mesh surface 31 and the second mesh surface 32 need to be welded are positioned, which facilitates the welding of the shielding mesh 3 by the staff.

[0035] Reference Figure 5 On the second mesh surface 32, on the opposite sides of the guide tube 2, a retaining ring 322 is fixedly connected. The retaining ring 322 surrounds the solder. The worker places the solder in the retaining ring 322 to position the solder so as to fix the welding position.

[0036] The implementation principle of a current transformer with a shielding mesh in this application embodiment is as follows: the operator first inserts the positioning part 311 on the first mesh surface 31 into the positioning groove 22, then inserts the protrusion 321 on the second mesh surface 32 into the through hole 312, and then places the solder in the retaining ring 322 to achieve the positioning of the welding position. The operator then welds the solder to complete the installation of the shielding mesh 3 on the conduit body 2.

[0037] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of this application should be included within the protection scope of this application.

Claims

1. A current transformer with a shielding mesh, comprising a housing (1), wherein a plurality of insulating shells (12) are provided inside the housing (1), an induction coil (13) is sleeved on the insulating shell (12), an insulating hole (121) is provided on the insulating shell (121), and a conduit (2) is provided inside the insulating hole (121), the conduit (2) being used for current input or output, characterized in that: The outer surface of the conduit body (2) is provided with a shielding mesh (3), which is used to reduce the gap between the conduit body (2) and the insulating hole (121).

2. A current transformer with a shielding mesh according to claim 1, characterized in that: The shielding mesh (3) includes a first mesh surface (31) and a second mesh surface (32), the second mesh surface (32) is welded to the first mesh surface (31), the first mesh surface (31) is welded to the conduit body (2), and the first mesh surface (31) extends circumferentially along the conduit body (2).

3. A current transformer with a shielding mesh according to claim 2, characterized in that: The first mesh surface (31) is provided with a reinforcing ring (33), which surrounds the outer edge of the first mesh surface (31) in a circumferential direction and is used to reinforce the first mesh surface (31).

4. A current transformer with a shielding mesh according to claim 3, characterized in that: A fixing rod (331) is fixedly connected to the inner surface of the reinforcing ring (33), and a fixing groove (21) is provided on the guide tube (2) for the fixing rod (331) to be inserted. When the fixing rod (331) is inserted into the fixing groove (21), the reinforcing ring (33) and the guide tube (2) are on the same axis.

5. A current transformer with a shielding mesh according to claim 2, characterized in that: The first mesh surface (31) is provided with a positioning part (311), and the guide tube body (2) is provided with a positioning groove (22) for the positioning part (311) to be inserted. When the positioning part (311) is inserted into the positioning groove (22), the first mesh surface (31) is fixed on the guide tube body (2).

6. A current transformer with a shielding mesh according to claim 5, characterized in that: The positioning groove (22) has a guide slope (221) on its groove wall. The distance from the guide slope (221) to the groove axis gradually decreases along the direction in which the positioning part (311) is inserted into the positioning groove (22). The guide slope (221) is used to guide the positioning part (311) to be inserted into the positioning groove (22).

7. A current transformer with a shielding mesh according to claim 5, characterized in that: The second mesh surface (32) is provided with a protrusion (321), and the positioning part (311) is provided with a through hole (312) for the protrusion (321) to be inserted. When the protrusion (321) is inserted into the through hole (312), the position where the first mesh surface (31) and the second mesh surface (32) need to be welded is positioned.

8. A current transformer with a shielding mesh according to claim 7, characterized in that: The second mesh surface (32) is provided with a retaining ring (322), which surrounds the solder and is used for placing the solder.

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