Partial discharge structure of high voltage cable

Abstract

The utility model relates to a local discharge structure of a high-voltage cable, comprising: a base, a discharge limiting frame, an insulating sleeve, an insulating sealing component, a mounting sleeve, and a pressing component. By removing the mounting sleeve from the discharge limiting frame and pulling the insulating sleeve out of the discharge limiting frame, the discharge limiting frame and the insulating sleeve can be conveniently disassembled, and the insulating sealing pad can be taken out from the insulating sleeve. By removing the insulating rubber sleeve provided in the insulating sleeve and the insulating sealing pad provided on the pressing block, a new insulating rubber sleeve and insulating rubber pad are replaced. After the replacement is completed, the insulating sleeve is installed in the discharge limiting frame, and the insulating sealing component is driven by the pressing component to move along the axial direction of the insulating sleeve, so that the insulating sealing pad contacts the insulating rubber sleeve, thereby completing the installation; by adopting the technical solution of the present application, the insulating material inside the local discharge test device can be conveniently replaced, and the service life of the discharge structure can be effectively extended.

Description

Technical Field

[0001] The utility model relates to the technical field of cable discharge, in particular to a local discharge structure of a high-voltage cable. Background Art

[0002] Partial discharge of high-voltage cables refers to the local discharge phenomenon generated in the cable insulation system. Local discharge usually propagates along the discharge path in the insulating material. These paths can be straight, arc-shaped or asymptotic, depending on factors such as the characteristics of the insulating material, voltage gradient and defect shape. The local discharge structure limits the discharge effect to the inside to ensure safety during discharge.

[0003] At present, the existing capacitor housing structure for high-voltage cable oscillation wave partial discharge test includes a base, a lower voltage equalizing connection block is arranged on the base, an insulating barrel is arranged in the lower voltage equalizing connection block, a capacitor is arranged in the insulating barrel, a medium voltage equalizing connection block is arranged above the insulating barrel, an adjusting piece for supporting and fixing the capacitor is arranged between the medium voltage equalizing connection block and the capacitor, and a small inductor is arranged on the medium voltage equalizing connection block. The capacitor body is fully enclosed in the insulating barrel by cooperating with the lower voltage equalizing connection block, the insulating barrel middle voltage equalizing connection block and the adjusting piece, which can effectively achieve the effect of waterproofing and moisture-proofing, thereby enhancing its insulation performance and mechanical properties as well as reasonable anti-corona shielding terminals. At the same time, the adjusting piece can be used to adjust the height of the capacitor in the insulating barrel within a certain range, thereby increasing applicability. However, long-term continuous discharge will cause damage to the insulating material inside the device. The insulating material inside the existing partial discharge test device is difficult to replace or even cannot be replaced. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a high-voltage cable partial discharge structure for solving the problem that the insulating material inside the existing partial discharge test device is difficult or even impossible to replace.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a high-voltage cable partial discharge structure, comprising:

[0006] Base;

[0007] A discharge limiting frame is arranged on the base, wherein the inner wall of the discharge limiting frame is provided with at least one mounting groove along the circumferential direction, and the mounting groove extends along the axial direction of the discharge limiting frame;

[0008] An insulating sleeve, wherein the outer wall of the insulating sleeve is provided with at least one mounting portion along the circumferential direction, the mounting portion is slidably matched with the mounting groove, and an insulating rubber sleeve is provided inside the insulating sleeve, and the insulating rubber sleeve is used to contact the cable;

[0009] An insulating sealing assembly, comprising a pressing block, an insulating sealing pad is provided on the periphery of the pressing block, the insulating sealing pad is slidably connected to the inner wall of the insulating sleeve, and the insulating sealing pad is used to cooperate with the insulating rubber sleeve to form a sealed insulating environment;

[0010] An installation sleeve shell is detachably connected to the discharge limiting frame, and the installation sleeve shell is used to close the discharge limiting frame;

[0011] A pressing assembly is inserted into the mounting sleeve, and is used to drive the insulating sealing assembly to move along the axial direction of the insulating sleeve.

[0012] Optionally, the insulating sealing assembly further includes a pressing seat, and the pressing seat is arranged on the pressing block.

[0013] Optionally, the pressing block has a plurality of locking assemblies distributed along the circumferential direction, and the locking assemblies are used to lock and fix the insulating sealing pad on the pressing block.

[0014] Optionally, the locking assembly includes a positioning column and a locking piece, the positioning column is penetrated through the insulating sealing pad, and the locking piece is threadedly connected to the positioning column.

[0015] Optionally, the pressing assembly includes a pushing screw and a handle, a threaded hole is penetrated through the mounting sleeve, the pushing screw is threadedly connected to the threaded hole, one end of the pushing screw along the axial direction is rotatably connected to the pressing seat, and the handle is arranged at one end of the pushing screw axially away from the pressing seat.

[0016] Optionally, an installation limit portion is provided at one end of the insulating sleeve along the axial direction, and the installation limit portion is used to limit the axial installation of the insulating sleeve along the discharge limiting frame.

[0017] Optionally, a lifting portion is symmetrically provided on the outer wall of the installation limit portion in the radial direction.

[0018] Optionally, the insulating sleeve is made of polyimide plastic.

[0019] Optionally, the inner wall of the discharge limiting frame is evenly distributed with four mounting grooves along the circumferential direction, and the outer wall of the insulating sleeve is evenly distributed with four mounting portions along the circumferential direction, and the mounting portions are matched with the mounting grooves in a concave-convex manner.

[0020] Optionally, the base comprises a supporting and fixing plate, and a plurality of supporting blocks are distributed along the circumference on a side of the supporting and fixing plate away from the discharge limiting frame along the thickness direction.

[0021] As described above, the utility model has the following beneficial effects: when the insulating rubber sleeve and the insulating sealing pad need to be replaced, due to the detachable connection between the mounting sleeve shell and the discharge limiting frame, the connection relationship between the mounting sleeve shell and the discharge limiting frame is disassembled, thereby opening the discharge limiting frame, and the mounting portion provided on the insulating sleeve is slidably matched with the mounting groove provided in the discharge limiting frame, thereby realizing convenient disassembly of the discharge limiting frame and the insulating sleeve, and due to the slidable connection between the insulating sealing pad and the insulating sleeve, the insulating sealing pad can be conveniently taken out of the insulating sleeve, and the new one can be replaced by disassembling the insulating rubber sleeve provided in the insulating sleeve and the insulating sealing pad provided on the pressing block. By assembling the insulating rubber sleeve in the insulating sleeve and assembling the new insulating sealing pad on the pressing block, the insulating rubber sleeve and the insulating sealing pad can be replaced. After the replacement is completed, the mounting portion of the insulating sleeve and the mounting groove of the discharge limiting frame can be quickly positioned and installed. The insulating sealing assembly is driven by the pressing assembly to move along the axial direction of the insulating sleeve, so that the insulating sealing pad contacts the insulating rubber sleeve, and the insulating rubber sleeve and the insulating sealing pad form a sealed insulating environment, thereby completing the installation. By adopting the technical solution of the present application, the insulating material inside the partial discharge test device can be conveniently replaced, and the service life of the discharge structure can be effectively extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a schematic diagram of a partial discharge structure of a high-voltage cable shown in an embodiment of the present application;

[0023] Figure 2 Shown is a schematic diagram of the structure of a discharge limiting frame shown in an embodiment of the present application;

[0024] Figure 3 The figure shows an isometric schematic diagram of an insulating sleeve shown in an embodiment of the present application;

[0025] Figure 4 Shown is a front view of an insulating sleeve shown in an embodiment of the present application;

[0026] Figure 5 Display as Figure 4 Schematic diagram of the AA section structure;

[0027] Figure 6 Shown is a schematic structural diagram of an insulating sealing assembly shown in an embodiment of the present application;

[0028] Figure 7 Shown is a schematic diagram of the assembly structure of the insulating sealing component and the pressing down component shown in the embodiment of the present application.

[0029] Description of Reference Numerals

[0030] Base 1, supporting fixing plate 101, supporting block 102, discharge limiting frame 2, mounting groove 201, insulating sleeve 3, mounting portion 301, mounting limiting portion 302, pulling portion 302a, insulating rubber sleeve 4, insulating sealing assembly 5, pressing block 501, insulating sealing gasket 502, pressing seat 503, mounting sleeve shell 6, pressing assembly 7, pushing screw 701, handle 702, locking assembly 8, positioning column 801, locking piece 802. DETAILED DESCRIPTION

[0031] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0032] See also Figures 1 to 7 . It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the utility model in a schematic manner, so the diagram only shows the components related to the utility model rather than being drawn according to the number, shape and size of the components during actual implementation. During actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated. The structure, proportion, size, etc. illustrated in the drawings attached to this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions for the implementation of the utility model, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the utility model without affecting the effect and purpose that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of the implementation of the present utility model without substantially changing the technical content.

[0033] Before describing the embodiment of the utility model in detail, the application environment of the utility model is described first. The technology of the utility model is mainly applied to the field of cable discharge technology. The utility model is used to solve the problem that the insulation material inside the existing partial discharge test device is difficult or even impossible to replace.

[0034] Please combine Figures 1 to 7 As shown, the utility model provides a local discharge structure of a high-voltage cable.

[0035] In an exemplary embodiment of the present application, a local discharge structure of a high-voltage cable includes: a base 1; a discharge limiting frame 2, which is arranged on the base 1, and the inner wall of the discharge limiting frame 2 is provided with at least one mounting groove 201 along the circumferential direction, and the mounting groove 201 extends along the axial direction of the discharge limiting frame 2; an insulating sleeve 3, the outer wall of the insulating sleeve 3 is provided with at least one mounting portion 301 along the circumferential direction, the mounting portion 301 is slidably matched with the mounting groove 201, and an insulating rubber sleeve 4 is provided inside the insulating sleeve 3, and the insulating rubber sleeve 4 is used to contact the cable; an insulating sealing component 5, including a pressing block 501, and the circumference of the pressing block 501 is provided with an insulating sealing gasket 502, the insulating sealing gasket 502 is slidably connected to the inner wall of the insulating sleeve 3, and the insulating sealing gasket 502 is used to cooperate with the insulating rubber sleeve 4 to form a sealed insulating environment; an installation shell 6, which is detachably connected to the discharge limiting frame 2, and the installation shell 6 is used to close the discharge limiting frame 2; a pressing component 7, which is passed through the installation shell 6, and the pressing component 7 is used to drive the insulating sealing component 5 to move along the axial direction of the insulating sleeve 3.

[0036] In this embodiment, when the insulating rubber sleeve 4 and the insulating sealing gasket 502 need to be replaced, due to the detachable connection between the mounting sleeve 6 and the discharge limiting frame 2, the mounting sleeve 6 is threadedly connected to the discharge limiting frame 2, and the connection relationship between the mounting sleeve 6 and the discharge limiting frame 2 is disassembled, thereby opening the discharge limiting frame 2, and the mounting portion 301 provided on the insulating sleeve 3 is slidably matched with the mounting groove 201 provided in the discharge limiting frame 2, and the insulating sleeve 3 is moved along the axial direction of the discharge limiting section to release the matching relationship between the mounting portion 301 and the mounting groove 201, thereby realizing convenient disassembly of the discharge limiting frame 2 and the insulating sleeve 3, and since the insulating sealing gasket 502 is slidably connected to the insulating sleeve 3, the insulating sealing gasket 502 can be conveniently taken out of the insulating sleeve 3, and the insulating rubber sleeve 4 provided in the insulating sleeve 3 is removed. The insulating rubber sleeve 4 and the insulating sealing pad 502 are removed from the pressing block 501, a new insulating rubber sleeve 4 is assembled in the insulating sleeve 3, and a new insulating sealing pad 502 is assembled on the pressing block 501, so that the insulating rubber sleeve 4 and the insulating sealing pad 502 can be replaced. After the replacement is completed, the mounting portion 301 of the insulating sleeve 3 and the mounting groove 201 of the discharge limiting frame 2 can be quickly positioned and installed, and the insulating sealing component 5 is driven by the pressing component 7 to move along the axial direction of the insulating sleeve 3, so that the insulating sealing pad 502 contacts with the insulating rubber sleeve 4, so that the insulating rubber sleeve 4 and the insulating sealing pad 502 form a sealed insulating environment, thereby completing the installation; by adopting the technical solution of the present application, the insulating material inside the partial discharge test device can be conveniently replaced, and the service life of the discharge structure can be effectively extended.

[0037] In an exemplary embodiment of the present application, the insulating sealing assembly 5 further includes a pressing seat 503 , and the pressing seat 503 is disposed on the pressing block 501 .

[0038] In this embodiment, the pressing seat 503 is disposed in the middle of the pressing block 501 . The pressing seat 503 is a cylindrical protrusion disposed on the pressing block 501 . The pressing seat 503 is used to cooperate with the pressing assembly 7 .

[0039] In an exemplary embodiment of the present application, the pressing block 501 has a plurality of sets of locking assemblies 8 distributed along the circumferential direction, and the locking assemblies 8 are used to lock and fix the insulating sealing gasket 502 on the pressing block 501 .

[0040] In this embodiment, the pressing block 501 has three groups of locking components 8 evenly distributed along the circumference, and the pressing component 7 applies downward pressure to the pressing seat 503. The insulating sealing component 5 moves along the axial direction of the insulating sleeve 3. Since the insulating sealing gasket 502 is slidingly connected to the inner wall of the insulating sleeve 3, there is friction resistance between the insulating sealing gasket 502 and the inner wall of the insulating sleeve 3. The insulating sealing gasket 502 is fixed to the pressing block 501 by setting the locking component 8, thereby preventing the insulating sealing gasket 502 from detaching from the pressing block 501 during the movement, thereby ensuring that the insulating sealing gasket 502 can contact the insulating rubber sleeve 4 to form a sealed insulating environment.

[0041] In an exemplary embodiment of the present application, the locking assembly 8 includes a positioning column 801 and a locking member 802 . The positioning column 801 is inserted into the insulating sealing pad 502 , and the locking member 802 is threadedly connected to the positioning column 801 .

[0042] In this embodiment, the positioning column 801 is disposed on the pressing block 501 , and the positioning column 801 passes through the insulating rubber pad, and is threadedly connected to the positioning column 801 through the locking member 802 , thereby fixing the insulating rubber pad on the pressing block 501 .

[0043] In an exemplary embodiment of the present application, the pressing assembly 7 includes a pushing screw 701 and a handle 702. A threaded hole is penetrated through the mounting sleeve 6, the pushing screw 701 is threadedly connected to the threaded hole, one end of the pushing screw 701 along the axial direction is rotatably connected to the pressing seat 503, and the handle 702 is arranged at one end of the pushing screw 701 away from the pressing seat 503 along the axial direction.

[0044] In this embodiment, a threaded hole is opened in the middle of the mounting sleeve 6 along the thickness direction, and the pushing screw 701 passes through the threaded hole and is rotatably connected to the pressing seat 503. The pushing screw 701 is threadedly connected to the threaded hole. A handle 702 is provided at one end of the pushing screw 701. The operator rotates the pushing screw 701 by holding the handle 702 to realize the axial movement of the insulating sealing assembly 5 along the insulating sleeve 3.

[0045] In an exemplary embodiment of the present application, an installation limit portion 302 is provided at one end of the insulating sleeve 3 along the axial direction, and the installation limit portion 302 is used to limit the installation of the insulating sleeve 3 along the axial direction of the discharge limiting frame 2 .

[0046] In this embodiment, the installation limit portion 302 is a circular ring arranged on one axial end of the insulating sleeve 3, the outer diameter of the installation limit portion 302 is larger than the outer diameter of the insulating sleeve 3, and the outer diameter of the installation limit portion 302 is smaller than the outer diameter of the discharge limiting frame 2. The insulating sleeve 3 is installed in the discharge limiting frame 2 to limit the axial direction of the insulating sleeve 3 by the installation limit portion 302.

[0047] In an exemplary embodiment of the present application, a lifting portion 302 a is symmetrically provided on the outer wall of the installation limiting portion 302 along the radial direction.

[0048] In this embodiment, the operator pulls the insulating sleeve 3 outward along the axial direction of the discharge limiting frame 2 through the lifting portion 302a provided on the installation limiting portion 302, so that the installation portion 301 is separated from the installation groove 201, and the insulating sleeve 3 is disassembled from the discharge limiting frame 2.

[0049] In an exemplary embodiment of the present application, the insulating sleeve 3 is made of polyimide plastic.

[0050] In this embodiment, the insulating sleeve 3, the mounting portion 301, the mounting limit portion 302 and the lifting portion 302a are all made of polyimide plastic. The cost of polyimide plastic is relatively low, which can effectively reduce the cost of replacing the material.

[0051] In an exemplary embodiment of the present application, the inner wall of the discharge limiting frame 2 has four mounting grooves 201 evenly distributed along the circumference, and the outer wall of the insulating sleeve 3 has four mounting portions 301 evenly distributed along the circumference, and the mounting portions 301 are matched with the mounting grooves 201 in a concave-convex manner.

[0052] In an exemplary embodiment of the present application, the base 1 includes a supporting and fixing plate 101 , and a plurality of supporting blocks 102 are distributed along a circumferential direction on a side of the supporting and fixing plate 101 away from the discharge limiting frame 2 along a thickness direction.

[0053] Working principle: when the insulating rubber sleeve 4 and the insulating sealing pad 502 need to be replaced, due to the detachable connection between the mounting sleeve shell 6 and the discharge limiting frame 2, the connection relationship between the mounting sleeve shell 6 and the discharge limiting frame 2 is disassembled, thereby opening the discharge limiting frame 2, and the mounting portion 301 set on the insulating sleeve 3 is slidably matched with the mounting groove 201 set in the discharge limiting frame 2, so that the discharge limiting frame 2 and the insulating sleeve 3 can be conveniently disassembled. Since the insulating sealing pad 502 is slidably connected with the insulating sleeve 3, the insulating sealing pad 502 can be conveniently taken out of the insulating sleeve 3, and the insulating rubber sleeve 4 set in the insulating sleeve 3 and the insulating sealing pad 502 set on the pressing block 501 are disassembled, and a new insulating rubber sleeve is installed. 4 is assembled in the insulating sleeve 3, and a new insulating sealing pad 502 is assembled on the pressing block 501, so that the insulating rubber sleeve 4 and the insulating sealing pad 502 can be replaced. After the replacement is completed, the mounting portion 301 of the insulating sleeve 3 and the mounting groove 201 of the discharge limiting frame 2 can be quickly positioned and installed. The insulating sealing component 5 is driven by the pressing component 7 to move along the axial direction of the insulating sleeve 3, so that the insulating sealing pad 502 contacts with the insulating rubber sleeve 4, so that the insulating rubber sleeve 4 and the insulating sealing pad 502 form a sealed insulating environment, thereby completing the installation; by adopting the technical solution of the present application, the insulating material inside the partial discharge test device can be conveniently replaced, and the service life of the discharge structure can be effectively extended.

[0054] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A high voltage cable partial discharge structure, characterized in that: include: Base; A discharge limiting frame is arranged on the base, wherein the inner wall of the discharge limiting frame is provided with at least one mounting groove along the circumferential direction, and the mounting groove extends along the axial direction of the discharge limiting frame; An insulating sleeve, wherein the outer wall of the insulating sleeve is provided with at least one mounting portion along the circumferential direction, the mounting portion is slidably matched with the mounting groove, and an insulating rubber sleeve is provided inside the insulating sleeve, and the insulating rubber sleeve is used to contact the cable; An insulating sealing assembly, comprising a pressing block, an insulating sealing pad is provided on the periphery of the pressing block, the insulating sealing pad is slidably connected to the inner wall of the insulating sleeve, and the insulating sealing pad is used to cooperate with the insulating rubber sleeve to form a sealed insulating environment; An installation sleeve shell is detachably connected to the discharge limiting frame, and the installation sleeve shell is used to close the discharge limiting frame; A pressing assembly is inserted into the mounting sleeve, and is used to drive the insulating sealing assembly to move along the axial direction of the insulating sleeve.

2. The high voltage cable partial discharge structure according to claim 1, characterized in that: The insulating sealing assembly also includes a pressing seat, and the pressing seat is arranged on the pressing block.

3. The high voltage cable partial discharge structure according to claim 2, characterized in that: The pressing block has a plurality of locking components distributed along the circumferential direction, and the locking components are used to lock and fix the insulating sealing pad on the pressing block.

4. The high voltage cable partial discharge structure according to claim 3, characterized in that: The locking assembly comprises a positioning column and a locking piece. The positioning column is penetrated on the insulating sealing pad, and the locking piece is threadedly connected to the positioning column.

5. The high voltage cable partial discharge structure according to claim 2, characterized in that: The pressing assembly includes a pushing screw and a handle. A threaded hole is penetrated through the mounting sleeve. The pushing screw is threadedly connected to the threaded hole. One end of the pushing screw along the axial direction is rotatably connected to the pressing seat. The handle is arranged at one end of the pushing screw axially away from the pressing seat.

6. The high voltage cable partial discharge structure according to claim 1, characterized in that: An installation limiting portion is provided at one end of the insulating sleeve along the axial direction, and the installation limiting portion is used to limit the installation of the insulating sleeve along the axial direction of the discharge limiting frame.

7. The high voltage cable partial discharge structure according to claim 6, characterized in that: The outer wall of the installation limiting portion is symmetrically provided with lifting portions along the radial direction.

8. The high voltage cable partial discharge structure according to claim 7, characterized in that: The insulating sleeve is made of polyimide plastic.

9. The high voltage cable partial discharge structure according to claim 1, characterized in that: The inner wall of the discharge limiting frame is evenly distributed with four mounting grooves along the circumferential direction, and the outer wall of the insulating sleeve is evenly distributed with four mounting parts along the circumferential direction, and the mounting parts are matched with the mounting grooves in a concave-convex manner.

10. The high voltage cable partial discharge structure according to claim 1, characterized in that: The base comprises a supporting and fixing plate, and a plurality of supporting blocks are distributed along a circumferential direction on a side of the supporting and fixing plate away from the discharge limiting frame in a thickness direction.

Images