CN121484777A - Prefabricated cable cones and their installation methods - Google Patents
Prefabricated cable cones and their installation methodsInfo
- Publication number
- CN121484777A CN121484777A CN202511336555.8A CN202511336555A CN121484777A CN 121484777 A CN121484777 A CN 121484777A CN 202511336555 A CN202511336555 A CN 202511336555A CN 121484777 A CN121484777 A CN 121484777A
- Authority
- CN
- China
- Prior art keywords
- cone
- cable
- stress
- prefabricated
- prefabricated cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/02—Cable terminations
- H02G15/06—Cable terminating boxes, frames or other structures
- H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
- H02G15/072—Cable terminating boxes, frames or other structures with devices for relieving electrical stress of the condenser type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
Landscapes
- Processing Of Terminals (AREA)
Abstract
本发明公开一种预制式电缆锥体及其安装方法。预制式电缆锥体包括一体成型的应力锥和电容锥，应力锥和电容锥能够套设于电缆本体，电容锥包括依次套设的多个屏蔽管，每相邻两个屏蔽管之间沿同一轴向错位设置，多个屏蔽管包括位于最内层的零屏和从零屏到最外层屏蔽管依次套设的M个电容屏，M为大于1的整数，每个电容屏沿轴向的长度通过特定式子确定。根据本发明实施例的预制式电缆锥体，能够避免因人工技能水平及经验水平的参差不齐导致的电缆锥体性能不稳定的问题，能够稳定实现电容锥均匀分压。
This invention discloses a prefabricated cable cone and its installation method. The prefabricated cable cone includes an integrally formed stress cone and a capacitor cone, which can be fitted onto the cable body. The capacitor cone includes a plurality of shielding tubes sequentially fitted together, with each adjacent pair of shielding tubes staggered along the same axial direction. The plurality of shielding tubes includes an innermost zero shield and M capacitor shields sequentially fitted from the zero shield to the outermost shielding tube, where M is an integer greater than 1. The axial length of each capacitor shield is determined by a specific formula. The prefabricated cable cone according to the embodiments of this invention can avoid the problem of unstable cable cone performance caused by uneven levels of human skill and experience, and can stably achieve uniform voltage distribution of the capacitor cone.
Description
Technical Field
The invention belongs to the field of cable equipment, and particularly relates to a prefabricated cable cone and an installation method thereof.
Background
The cable is the core equipment of power transmission, and the cable termination of cable includes the cable cone, and the cable cone can include stress cone and electric capacity cone, and electric capacity cone can include a plurality of shielding pipes, forms partial pressure electric capacity between the adjacent shielding pipe, and a plurality of partial pressure electric capacity form the series connection structure. The sizing of the shield tube affects the uniformity of the voltage division across the plurality of voltage dividing capacitors.
In the related art, the size design of the shielding tube mainly depends on experience setting, and the stability of uniform voltage division of the capacitor cone is difficult to ensure.
Disclosure of Invention
The invention provides a prefabricated cable cone and an installation method thereof, which are used for improving the stability of uniform voltage division of a capacitor cone.
In a first aspect, an embodiment of the present invention provides a prefabricated cable cone, where the prefabricated cable cone includes an integrally formed stress cone and a capacitance cone, where the stress cone and the capacitance cone can be sleeved on a cable body, the capacitance cone includes a plurality of shielding pipes sleeved in sequence, every two adjacent shielding pipes are arranged in a staggered manner along the same axial direction, the plurality of shielding pipes include a zero screen located at an innermost layer and M capacitance screens sleeved in sequence from the zero screen to an outermost layer, M is an integer greater than 1, and a length of each capacitance screen along an axial direction is determined by:
;
Wherein, the The length of the N-th capacitive screen along the axial direction, which is sleeved in sequence from the zero screen to the outermost layer of the shielding pipe, is more than or equal to 2 and less than or equal to M, wherein the length of the zero screen along the axial directionFor a first preset value, the axial length of the first capacitive screenIs a second preset value; For axial displacement between two adjacent shield pipes, Is a preset constant; radius for the zero screen; for the insulation thickness between adjacent shield pipes, Is a preset constant; for each thickness of the capacitive screen, Is a preset constant; a relative dielectric constant of an insulating layer of the cable body; a relative dielectric constant of an insulating layer that is the capacitor cone; is the radius of the shielding layer of the cable body.
According to the foregoing embodiment of the first aspect of the present invention, the zero screen is disposed in contact with the insulation layer of the cable body in a state in which the prefabricated cable cone is mounted to the cable body.
According to any one of the foregoing embodiments of the first aspect of the present invention, the prefabricated cable cone further includes a rolling mold core, the stress cone and the capacitance cone are sleeved on the periphery of the rolling mold core, and the rolling mold core is detachably connected with the stress cone and the capacitance cone.
According to any one of the foregoing embodiments of the first aspect of the present invention, the inner peripheral walls of the stress cone and the capacitance cone are provided with first redundant insulating paper, and the outer peripheral walls of the stress cone and the capacitance cone are provided with second redundant insulating paper.
According to any of the foregoing embodiments of the first aspect of the present invention, the stress cone has a curved profile extending curvilinearly from a minimum diameter end to a maximum diameter end of the stress cone, the stress cone satisfying the following equation at a specific point on the curved profile:
;
Wherein, the Taking the minimum diameter end of the curve profile as a reference point, and the axial displacement length from the specific point to the reference point; Is an operating voltage; Locating field strengths at locations for the features; Is the radius at the maximum diameter of the curve profile; A radius at a minimum diameter of the curve profile; is the radius of the shielding layer of the cable body.
In a second aspect, an embodiment of the present invention provides a method for installing a prefabricated cable cone, which includes obtaining a prefabricated cable cone according to any one of the foregoing embodiments of the first aspect of the present invention, thinning an insulating layer of a region to be installed of a cable body, and sleeving a stress cone and a capacitance cone of the prefabricated cable cone on the region to be installed of the cable body.
According to any one of the foregoing embodiments of the second aspect of the present invention, the thinning treatment of the insulation layer of the area to be installed of the cable body includes forming an inclined plane on the outer surface of the insulation layer at a preset position of the cable body.
According to any one of the foregoing embodiments of the second aspect of the present invention, the prefabricated cable cone further includes a winding mold core, the stress cone and the capacitance cone are sleeved on the periphery of the winding mold core, and before the step of sleeving the stress cone and the capacitance cone of the prefabricated cable cone on the area to be installed of the cable body, the installation method of the prefabricated cable cone further includes stripping the winding mold core through the large caliber ends of the stress cone and the capacitance cone.
According to any one of the foregoing embodiments of the second aspect of the present invention, the stress cone and the inner peripheral wall of the capacitor cone are provided with first redundant insulating paper, the stress cone and the outer peripheral wall of the capacitor cone are provided with second redundant insulating paper, and before the step of sleeving the stress cone and the capacitor cone of the prefabricated cable cone on the area to be installed of the cable body, the installation method of the prefabricated cable cone further includes thinning the first redundant insulating paper, and after the step of sleeving the stress cone and the capacitor cone of the prefabricated cable cone on the area to be installed of the cable body, the installation method of the prefabricated cable cone further includes thinning the second redundant insulating paper.
According to any one of the embodiments of the second aspect of the present invention, the sleeving of the stress cone and the capacitance cone of the prefabricated cable cone on the area to be installed of the cable body includes binding the stress cone and the capacitance cone with a binding rope, sleeving the stress cone and the capacitance cone on the cable body along the central axis of the cable body by a hanger, and pouring hot oil on the joint surfaces of the stress cone and the capacitance cone with the cable body while sleeving.
According to any one of the foregoing embodiments of the second aspect of the present invention, after the step of sleeving the stress cone and the capacitance cone of the prefabricated cable cone on the area to be installed of the cable body, the installation method of the prefabricated cable cone further includes wrapping the ends of the stress cone and the capacitance cone with oil-impregnated creped insulating paper.
According to the prefabricated cable cone provided by the embodiment of the invention, the cable cone is of a prefabricated structure, and the stress cone is manufactured without depending on manual wrapping and cutting sites, so that the problem of unstable cable cone performance caused by uneven manual skill level and experience level can be avoided. The prefabricated cable cone includes stress cone and electric capacity cone, the shielding pipe of electric capacity cone is including being located the zero screen of inlayer and from zero screen to the M electric capacity screen that outer shielding pipe set gradually, wherein electric capacity screen is confirmed through following specific formula along axial length, thereby guarantee the accuracy of electric capacity screen size design, make the accurate scene demand that satisfies of a plurality of shielding pipes of prefabricated cable cone, make prefabricated cable cone install behind the cable body, can stably realize the even partial pressure of electric capacity cone, guarantee that electric field distribution is more reasonable simultaneously.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of the main components of an embodiment of a prefabricated cable cone according to the present invention in a state of being mounted to a cable body;
Fig. 2 is a flow chart of an embodiment of a method of installing a prefabricated cable cone according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is to be noted that, all directional indicators in the embodiments of the present invention such as up, down, left, right, front the following..once. Is used only to explain the relative positional relationship between the components, the movement conditions and the like in a certain specific posture as shown in the drawings, if the particular gesture changes, the directional indication changes accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The embodiment of the invention provides a prefabricated cable cone which is used for being installed on a cable body. The cable body is for example an oil filled submarine cable. Fig. 1 is a schematic cross-sectional view of the main components of an embodiment of the prefabricated cable cone according to the present invention in a state of being mounted on a cable body. The prefabricated cable cone comprises an integrally formed stress cone 110 and a capacitance cone 120, and the stress cone 110 and the capacitance cone 120 can be sleeved on the cable body 200.
The capacitor cone 120 comprises a plurality of shielding pipes 121 sleeved in sequence. Every two adjacent shielding pipes 121 are arranged in a staggered way along the same axial direction. In the present embodiment, every two adjacent shielding pipes 121 are arranged in a staggered manner along the same axial direction, so that the plurality of shielding pipes 121 form a stepped inclined surface structure. The shielding pipes 121 comprise zero screens located at the innermost layer and M capacitance screens sleeved in sequence from the zero screens to the outermost shielding pipes 121, M is an integer greater than 1, and the length of each capacitance screen along the axial direction is determined by the following formula:
;
In the above-mentioned method, the step of, The length of the N-th capacitive screen along the axial direction, which is sleeved in sequence from the zero screen to the outermost layer of the shielding pipe, is more than or equal to 2 and less than or equal to M, wherein the length of the zero screen along the axial directionFor a first preset value, the axial length of the first capacitive screenIs a second preset value; for axial displacement between two adjacent shield pipes 121, Is a preset constant; Radius of zero screen; for the insulation thickness between adjacent shield pipes 121, Is a preset constant; for the thickness of each capacitive screen, Is a preset constant; the relative dielectric constant of the insulating layer of the cable body; The relative dielectric constant of the insulating layer that is the capacitor cone 120; Is the radius of the shielding layer of the cable body.
According to the prefabricated cable cone provided by the embodiment of the invention, the cable cone is of a prefabricated structure, and the stress cone 110 is manufactured without relying on manual wrapping and cutting sites, so that the problem of unstable cable cone performance caused by uneven manual skill level and experience level can be avoided. The prefabricated cable cone includes stress cone 110 and electric capacity cone 120, electric capacity cone 120's shielding pipe 121 is including being located the zero screen of inlayer and from zero screen to the M electric capacity screen that outer shielding pipe 121 overlaps in proper order and establish, wherein electric capacity screen is confirmed through following specific formula along axial length to guarantee the accuracy of electric capacity screen size design, make the accurate scene demand that satisfies of a plurality of shielding pipes 121 of prefabricated cable cone's size, make prefabricated cable cone install behind cable body 200, can stably realize electric capacity cone 120 even partial pressure, guarantee that electric field distribution is more reasonable simultaneously.
In some embodiments, the stress cone 110 has a curvilinear profile that extends curvilinearly from a minimum diameter end to a maximum diameter end of the stress cone 110. In some embodiments, the following sub-relationship is satisfied at a particular point on the curve profile of the stress cone 110:
;
In the above-mentioned method, the step of, The axial displacement length from a specific point to a reference point by taking the minimum diameter end of the curve profile as the reference point; Is an operating voltage; locating the field strength at the location for the feature; radius at maximum diameter of the curve profile; Radius at the minimum diameter of the curve profile; Is the radius of the shielding layer of the cable body.
In some embodiments, the zero screen is disposed in contact with the insulation layer of the cable body 200 in a state where the prefabricated cable cone is mounted to the cable body 200.
In some embodiments, the prefabricated cable cone further includes a rolling mold core, the stress cone 110 and the capacitance cone 120 are sleeved on the outer periphery of the rolling mold core, and the rolling mold core is detachably connected with the stress cone 110 and the capacitance cone 120.
In some embodiments, the stress cone 110 and the capacitance cone 120 of the prefabricated cable cone are made of insulating paper materials and aluminum foil electrode materials, and are rolled into an integrated cone structure by a winding machine, and after rolling, the cone structure is dried in a vacuum environment and then immersed in oil.
In some embodiments, the inner peripheral walls of stress cone 110 and capacitance cone 120 are provided with a first redundant insulating paper, and the outer peripheral walls of stress cone 110 and capacitance cone 120 are provided with a second redundant insulating paper. The first redundant insulating paper is of a laminated multilayer structure, and the second redundant insulating paper is of a laminated multilayer structure. In the installation of prefabricated cable cone, get rid of the redundant insulating paper of certain layer number through tearing, can realize the attenuate processing to the redundant insulating paper of first, get rid of the redundant insulating paper of second of certain layer number through tearing, can realize the attenuate processing to the redundant insulating paper of second.
The embodiment of the invention also provides a method for installing the prefabricated cable cone. Fig. 2 is a flow chart of an embodiment of a method of installing a prefabricated cable cone according to the present invention. The installation method of the prefabricated cable cone comprises the steps of S110, S120 and S150.
In step S110, a prefabricated cable cone of any of the previous embodiments is obtained.
The prefabricated cable cone comprises a stress cone 110 and a capacitance cone 120 which are integrally formed, and the stress cone 110 and the capacitance cone 120 can be sleeved on the cable body 200. The capacitor cone 120 comprises a plurality of shielding pipes 121 sleeved in sequence. Every two adjacent shielding pipes 121 are arranged in a staggered way along the same axial direction. In the present embodiment, every two adjacent shielding pipes 121 are arranged in a staggered manner along the same axial direction, so that the plurality of shielding pipes 121 form a stepped inclined surface structure. The shielding pipes 121 comprise zero screens located at the innermost layer and M capacitance screens sleeved in sequence from the zero screens to the outermost shielding pipes 121, M is an integer greater than 1, and the length of each capacitance screen along the axial direction is determined by the following formula:
;
In the above-mentioned method, the step of, The length of the N-th capacitive screen along the axial direction, which is sleeved in sequence from the zero screen to the outermost layer of the shielding pipe, is more than or equal to 2 and less than or equal to M, wherein the length of the zero screen along the axial directionFor a first preset value, the axial length of the first capacitive screenIs a second preset value; for axial displacement between two adjacent shield pipes 121, Is a preset constant; Radius of zero screen; for the insulation thickness between adjacent shield pipes 121, Is a preset constant; for the thickness of each capacitive screen, Is a preset constant; the relative dielectric constant of the insulating layer of the cable body; The relative dielectric constant of the insulating layer that is the capacitor cone 120; Is the radius of the shielding layer of the cable body.
In step S120, the insulation layer of the area to be mounted of the cable body 200 is thinned.
In some embodiments, the insulating layer of the cable body 200 comprises a plurality of layers of insulating paper, the insulating paper of the cable body 200 is stripped to make the outer diameter of the insulating paper conform to a preset value, and then the insulating paper of the cable body 200 can be wound with the oil-immersed crepe paper to prevent the insulating paper of the cable body 200 from scattering.
In some embodiments, the step S120 of thinning the insulation layer of the area to be installed of the cable body 200 includes forming an inclined surface on the outer surface of the insulation layer at a predetermined position of the cable body 200, thereby facilitating the sheathing of the prefabricated cable cone.
In step S150, the stress cone 110 and the capacitance cone 120 of the prefabricated cable cone are sleeved on the area to be installed of the cable body 200.
In some embodiments, the preformed cable cone further comprises a rolling mandrel around which the stress cone 110 and the capacitance cone 120 are sleeved. In some embodiments, prior to step S150, the method of installing a prefabricated cable cone further comprises step S130.
In step S130, the wound core is peeled off via the large diameter ends of the stress cone 110 and the capacitance cone 120. In some embodiments, the preformed cable cone is immersed in an oil drum, and prior to step S150, the preformed cable cone is removed from the oil drum and the wound core is slowly removed relative to the stress cone 110 and the capacitance cone 120 in a direction through the large caliber ends of the stress cone 110 and the capacitance cone 120. Deformation or hemming of the stress cone 110 and the capacitance cone 120 during removal is avoided. After the stress cone 110 and the capacitance cone 120 are taken out, whether the actual dimensions of the stress cone 110 and the capacitance cone 120 are consistent with the required dimensions is checked, and the redundant insulating layer structure can be sawed or cut off according to the requirements.
In some embodiments, the inner peripheral walls of stress cone 110 and capacitance cone 120 are provided with a first redundant insulating paper, and the outer peripheral walls of stress cone 110 and capacitance cone 120 are provided with a second redundant insulating paper. In some embodiments, prior to step S150, the method of installing a prefabricated cable cone further comprises step S140.
In step S140, the first redundant insulating paper is subjected to thinning processing. The first redundant insulating paper is of a multilayer structure which is arranged in a laminated mode, and the first redundant insulating paper with a certain number of layers is removed through tearing, so that thinning treatment of the first redundant insulating paper can be achieved.
In some embodiments, after step S150, the method of installing a prefabricated cable cone further comprises step S170.
In step S170, the second redundant insulating paper is subjected to thinning processing. The second redundant insulating paper is of a multilayer structure which is arranged in a laminated mode, and the second redundant insulating paper with a certain layer number is removed through tearing, so that thinning treatment of the second redundant insulating paper can be achieved.
In some embodiments, step S150 further comprises binding the stress cone 110 and the capacitance cone 120 with binding ropes, sleeving the stress cone 110 and the capacitance cone 120 on the cable body 200 along the central axis of the cable body 200 by using a lifting tool, and pouring hot oil on the joint surfaces of the stress cone 110 and the capacitance cone 120 with the cable body 200 while sleeving, thereby ensuring lubrication of the joint surfaces of the stress cone 110 and the capacitance cone 120 with the cable body 200, avoiding curling of an insulating layer, and simultaneously removing dirt stained in the sleeving process and preventing moisture absorption.
In some embodiments, after step S150, the method of installing a prefabricated cable cone further comprises step S160.
In step S160, the ends of the stress cone 110 and the capacitance cone 120 are wrapped with the oil-impregnated creped insulating paper to prevent the capacitance cone 120 from being abnormally displaced.
In some embodiments, after step S150, the specific structures of the stress cone 110 and the capacitance cone 120 are electrically connected. In some embodiments, after step S150, the prefabricated cable cone is bound with tinned copper wire and bound with oiled crepe paper.
According to the method for installing the prefabricated cable cone, the obtained cable cone is of a prefabricated structure, and the stress cone 110 is manufactured on the manually-wrapped cutting site, so that the problem of unstable cable cone performance caused by uneven manual skill level and experience level can be avoided. The prefabricated cable cone includes stress cone 110 and electric capacity cone 120, electric capacity cone 120's shielding pipe 121 is including being located the zero screen of inlayer and from zero screen to the M electric capacity screen that outer shielding pipe 121 overlaps in proper order and establish, wherein electric capacity screen is confirmed through following specific formula along axial length to guarantee the accuracy of electric capacity screen size design, make the accurate scene demand that satisfies of a plurality of shielding pipes 121 of prefabricated cable cone's size, make prefabricated cable cone install behind cable body 200, can stably realize electric capacity cone 120 even partial pressure, guarantee that electric field distribution is more reasonable simultaneously.
The embodiment of the invention also provides a cable terminal, which comprises a cable body, the prefabricated cable cone, the terminal flange, the insulating filling material, the insulating outer sheath, the current-carrying fitting, the wiring terminal and the sealing assembly, wherein the prefabricated cable cone is integrally formed with the stress cone and the capacitance cone, and the components, the cable body, the stress cone and the capacitance cone can be connected in a well-known manner.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, but rather, the equivalent structural changes made by the description and drawings of the present invention or the direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (11)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511336555.8A CN121484777A (en) | 2025-09-18 | 2025-09-18 | Prefabricated cable cones and their installation methods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511336555.8A CN121484777A (en) | 2025-09-18 | 2025-09-18 | Prefabricated cable cones and their installation methods |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN121484777A true CN121484777A (en) | 2026-02-06 |
Family
ID=98615800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202511336555.8A Pending CN121484777A (en) | 2025-09-18 | 2025-09-18 | Prefabricated cable cones and their installation methods |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN121484777A (en) |
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2025
- 2025-09-18 CN CN202511336555.8A patent/CN121484777A/en active Pending
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