CN114068096A

CN114068096A - Novel self-contained oil-filled cable

Info

Publication number: CN114068096A
Application number: CN202111370731.1A
Authority: CN
Inventors: 房向阳; 秦涛; 耿芳; 杨肇辉; 马聪智; 白苏娜; 邵冰然; 陆然; 杨涛; 罗喜群; 唐继朋
Original assignee: State Grid Corp of China SGCC; State Grid Tianjin Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; State Grid Tianjin Electric Power Co Ltd
Priority date: 2021-11-18
Filing date: 2021-11-18
Publication date: 2022-02-18

Abstract

The invention discloses a novel self-contained oil-filled cable, the cross section of which comprises a central cable core, a cable core shielding layer, an annular oil duct, an annular lead, a lead shielding layer, an insulating layer, an inner liner layer, a backing layer, a reinforcing layer and an outer tegument layer from inside to outside in sequence; the cable core shielding layer is fixedly attached to the outer surface of the central cable core, an annular oil duct is formed between the cable core shielding layer and the annular lead, the lead shielding layer, the insulating layer, the lining layer, the backing layer, the reinforcing layer and the outer lining layer are sequentially fixedly attached, sealed and connected from inside to outside, and the lead shielding layer is fixedly attached to the surface of the annular lead; the invention can reduce the operation temperature on the basis of the existing oil-filled cable, thereby improving the current-carrying capacity, and has the advantages of simple structure and strong applicability by using a novel structure and material construction.

Description

Novel self-contained oil-filled cable

Technical Field

The invention relates to the technical field of novel material application, in particular to a novel self-contained oil-filled cable.

Background

The structure of the high-voltage oil-filled cable mainly comprises two forms of a self-contained oil-filled cable and a steel tube oil-filled cable, the oil-filled cable has many advantages compared with a common cable, and because certain pressure is kept in the cable insulation, external moisture and air cannot enter the insulation from the cable body or accessories, the long-term operation reliability of the oil-filled cable is not a problem as long as the oil pressure is normal, and the service life of the oil-filled cable can reach forty-five years. The cable insulation with the natural mineral oil as the main body has high stability in an electric field. Even if the oil-filled cable has the abnormal phenomena of oil leakage caused by damage to the protective layer due to external force damage, grounding of the protective layer, short-time overload, high temperature and the like, operating personnel can take measures to process according to the abnormal oil pressure indication and the action of the alarm device in time, and accidents are avoided. If the oil leakage is not large, the oil supply device can maintain the oil pressure to continue to operate, and the treatment is carried out when the planned power failure is waited.

The existing oil-filled cable has many disadvantages: the insulating oil for oil-filled cables is a combustible liquid, and the common insulating oil has a low flash point (the Min point of low-viscosity oil is generally below 140 ℃), so that the oil can easily catch fire; the termination operation requires the use of open-fire equipment such as a torch, which can cause ignition without much attention, and if the oil-filled cable line in operation is ignited by external reasons or explosion of the cable head, serious fire can be caused by the 'flame retardance' of the cable. Secondly, the common oil-filled cable has high condensation point and pour point, and the lowest temperature can reach-50 ℃ in winter in the north of China, which has considerable potential safety hazard on the normal operation of a power system, so that the materials and the construction mode of the oil-filled cable need to be deeply researched to improve the normal work of the cable, improve the stability of the power system and prevent accidents.

Disclosure of Invention

The invention aims to provide a novel oil-filled cable, which can reduce the operation temperature on the basis of the existing oil-filled cable so as to improve the current-carrying capacity, and has the advantages of simple structure and strong applicability by using a novel structure and material structure.

In order to achieve the purpose, the invention provides the following scheme:

the invention discloses the following technical effects:

the invention designs a novel self-contained oil-filled cable, wherein an annular oil duct is added in the traditional oil-filled cable to separate a cable core from an outer ring cable, so that the current-carrying capacity is improved; according to the novel nano insulating oil, the current-carrying capacity is improved through a novel structure, the center of the cable is the central cable core, the annular oil duct is arranged outside the central cable core, and the novel nano insulating oil is filled with the novel nano insulating oil, has the advantages of high flash point, strong heat conduction capability, strong ageing resistance and the like, and can improve the running stability of the novel nano insulating oil compared with the traditional cable oil; the outer layer of the annular oil duct is a metal conductor, and compared with the traditional oil-filled cable, the structure of the annular oil duct is provided with one more layer of annular conductor, so that the current-carrying capacity can be improved, and the insulating oil in the middle is used as a heat-conducting insulating layer, so that the temperature can be stabilized in a proper range; the novel self-contained oil-filled cable provided by the invention has the advantages of simple structure, high current-carrying capacity and strong applicability.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic cross-sectional view of a novel self-contained oil-filled cable of the present invention;

description of reference numerals: 1. a central cable core; 2. a cable core shielding layer; 3. an annular oil passage; 4. a loop wire; 5. a wire shielding layer; 6. an insulating layer; 7. an inner liner layer; 8. a backing layer; 9. a reinforcing layer; 10. and a tegument layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The cross section of the novel self-contained oil-filled cable provided by the invention sequentially comprises a central cable core, a cable core shielding layer, an annular oil duct, an annular lead, a lead shielding layer, an insulating layer, an inner liner layer, a backing layer, a reinforcing layer and an outer tegument layer from inside to outside; the cable core shielding layer is fixedly attached to the outer surface of the central cable core, an annular oil duct is formed between the cable core shielding layer and the annular lead, the lead shielding layer, the insulating layer, the lining layer, the backing layer, the reinforcing layer and the outer lining layer are sequentially fixedly attached, sealed and connected from inside to outside, and the lead shielding layer is fixedly attached to the surface of the annular lead; as shown in fig. 1, the cable structure includes: the cable comprises a central cable core 1, a cable diameter of which is 35mm, a cable core shielding layer 2 attached to the central cable core is 2mm in thickness, an annular oil duct 3 is arranged between the cable core shielding layer and an annular lead 4, the oil duct is 15mm in thickness, the annular lead is 10mm in thickness, a lead shielding layer 5 is attached to the annular lead 4, and the lead shielding layer is 2 mm; insulating layer 6 still plays supporting role in playing insulating effect, therefore its thickness is 10mm, above-mentioned all structures of inner liner 7 parcel, its thickness is 3mm, backing layer 8 is attached to on inner liner 7 for 3mm, enhancement layer 9 is 5mm, tegument 10 is 5mm, and outmost as the cable plays effects such as anticorrosion and insulation.

The novel self-contained oil-filled cable provided by the invention is provided with two leads which are respectively positioned in the center of the cable and the outer ring of an oil duct, and the oil-through oil duct is positioned between the two leads to play a role in insulating and transferring heat; the pressure type cable is a self-contained pressure type cable which takes nano insulating oil as a pressurized fluid and can enable the oil to freely flow in the cable. The novel self-contained oil-filled cable has excellent insulating property, can bear high working electric field intensity, and has low dielectric loss, good heat dissipation, reliable protective layer protection and joint accessories.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. A novel self-contained oil-filled cable is characterized in that the cross section of the novel self-contained oil-filled cable sequentially comprises a central cable core, a cable core shielding layer, an annular oil duct, an annular lead, a lead shielding layer, an insulating layer, an inner liner layer, a backing layer, a reinforcing layer and an outer tegument layer from inside to outside; the cable core shielding layer is attached to and fixed on the outer surface of the central cable core, an annular oil duct is formed between the cable core shielding layer and the annular lead, the lead shielding layer, the insulating layer, the inner liner layer, the backing layer, the reinforcing layer and the outer lining layer are sequentially attached to, sealed and fixedly connected from inside to outside, and the lead shielding layer is attached to and fixed on the surface of the annular lead.

2. The novel self-contained oil-filled cable according to claim 1, wherein the annular oil passage is filled with novel nano insulating oil.

3. The novel self-contained oil-filled cable according to claim 1, wherein the cable diameter of the central cable core is 35mm, the thickness of the cable core shielding layer is 2mm, the thickness of the annular oil passage is 15mm, the thickness of the annular conductor is 10mm, and the thickness of the conductor shielding layer is 2 mm; the insulating layer thickness is 10mm, 7 thickness of inner liner are 3mm, the backing layer is 3mm, the reinforcing layer thickness is 5mm, the outer quilt layer thickness is 5 mm.