Self-heating energy-saving high-voltage aerial cable

Abstract

The utility model relates to a self-heating energy-saving type high-voltage aerial cable, which comprises an expanded-diameter lead, the inner-layer semi-conductive shielding layer is coated on the expanded-diameter wire; the insulating layer is coated on the inner semi-conductive shielding layer; the outer semi-conductive shielding layer is coated on the insulating layer; the inner braid layer is made of a heat insulation material and wraps the outer semi-conductive shielding layer; the outer braid layer is made of an electric heating material and wraps the inner braid layer; and the sheath is coated on the outer braid layer. According to the utility model, the heating material and the conductor are separated by the thermal insulation material, and only the sheath is heated without influencing the internal conductor, so that the resistance of the conductor is prevented from rising and the power transmission efficiency is prevented from being influenced.

Description

TECHNICAL FIELD

[0001] The utility model relates to overhead cable field especially relates to a self -heating energy -saving high -voltage overhead cable. BACKGROUND

[0002] In prior art, electric heating material is easy to heat conductor while heating sheath, which leads to the rise of conductor resistance and reduces power transmission efficiency, such as Chinese utility model CN 204348415 U discloses a heating expansion type anti-icing and snowing middle strength aluminum alloy overhead cable, the aluminum alloy monofilament conductor section is trapezoidal, the surface of aluminum alloy monofilament conductor is plated with low curie point alloy layer, the aluminum alloy monofilament conductor on the outermost layer is provided with finger-shaped protrusion, the surface of insulating layer is coated with a layer of nanometer anti-icing and snowing coating, the aluminum alloy soft air pipe is provided with hollow ceramic support frame, and heating resistance strip is placed in the recess of hollow ceramic support frame. The heating resistance strip is arranged in the inside, which is easy to heat conductor, thereby leading to the rise of conductor resistance and affecting power transmission efficiency. SUMMARY

[0003] The utility model solves the technical problem to provide a self -heating energy -saving high -voltage overhead cable, and the heating material is separated from the conductor by using heat insulation material, only the sheath is heated, and the conductor in the inside is not affected, thereby avoiding the rise of conductor resistance and affecting power transmission efficiency.

[0004] To solve the above problem and adopt a self -heating energy -saving high -voltage overhead cable, which comprises:

[0005] Expansion wire;

[0006] Inner semiconductive shielding layer, which is coated on expansion wire;

[0007] Insulating layer, which is coated on inner semiconductive shielding layer;

[0008] Outer semiconductive shielding layer, which is coated on insulating layer;

[0009] Inner braided layer, which is made of heat insulation material and is coated on outer semiconductive shielding layer;

[0010] Outer braided layer, which is made of electric heating material and is coated on inner braided layer;

[0011] Sheath, which is coated on outer braided layer.

[0012] Adopt such structure, inner semiconductive shielding layer fills the fine unevenness on the surface of expansion wire, forms smooth equipotential surface, makes electric field distribute evenly along insulating layer, avoids partial discharge or breakdown.

[0013] The inner semiconductive shielding layer and the outer semiconductive shielding layer are tightly combined with the insulating layer, eliminate air gap and prevent partial discharge; the outer semiconductive shielding layer is grounded to release induced charge on the surface of the insulating layer and avoid the risk of electric shock;

[0014] The insulating layer is covered in the middle and effectively protected;

[0015] The inner woven layer is made of heat insulation material to protect the inside from the influence of the electric heating material;

[0016] The outer woven layer is made of electric heating material, and the electric heating can heat the sheath, which is beneficial to the ice removal on the surface of the sheath.

[0017] As a further improvement of the utility model, the expanded diameter conductor is made of copper alloy core pipe stranded conductor.

[0018] As a further improvement of the utility model, the inner semiconductive shielding layer and the outer semiconductive shielding layer are made of polyethylene or ethylene copolymer as base material and add carbon black.

[0019] As a further improvement of the utility model, the insulating layer is made of crosslinked polyethylene.

[0020] As a further improvement of the utility model, the inner woven layer is made of glass fiber wire.

[0021] As a further improvement of the utility model, the outer woven layer is made of graphene fiber wire.

[0022] As a further improvement of the utility model, the sheath is made of weather-resistant material.

[0023] As a further improvement of the utility model, the thermocouple compensation wire is arranged between the inner woven layer and the outer woven layer.

[0024] As a further improvement of the utility model, the thermocouple compensation wire is made of a conductor extruded and wrapped with a layer of polytetrafluoroethylene insulation layer, wherein the positive electrode is a nichrome alloy wire conductor, and the negative electrode is a nickel-silicon alloy wire conductor; the thermocouple probe formed by short-circuiting the positive and negative conductors is embedded in the cable.

[0025] As a further improvement of the utility model, the outer semiconductive shielding layer and the inner woven layer are fixed by setting hot melt adhesive and nylon mesh cloth, and the nylon mesh cloth is attached to the inner woven layer.

[0026] With such structure, the deformation between the outer semiconductive shielding layer and the inner woven layer caused by temperature stress in daily use is prevented, for example, the internal heat generated by the conductor can cause the insulation layer to expand, and the outer semiconductive shielding layer is easily pressed by the expansion, while the inner woven layer is glass fiber yarn which has small or no deformation capacity when heated, and is easily broken by expansion, the nylon mesh cloth separates the woven layer from the outer semiconductive shielding layer, the hot melt adhesive has certain deformation capacity and can be pressed, and has a buffering effect, and the nylon mesh cloth provides a skeleton for the hot melt adhesive to adhere, which is beneficial to resist the shearing force and protect the inner woven layer from being broken by expansion.

[0027] The utility model mainly is through giving outer woven layer current, the heat generated is diffused to the sheath fast, makes the surface of overhead cable sustained heat preservation, thereby makes the sheath surface moisture not easy condensation forms ice block, in the promotion winter power grid power supply reliability while not because insulation temperature rise and influences cable life. The cable characteristics is by high strength copper alloy expansion pipe constitutes the conductive core of cable, in the conductor outside is in turn extruded and covered inner layer semiconductive shielding layer, insulation layer, outer layer semiconductive shielding layer, sets up inner woven layer as heat insulating layer in outer layer semiconductive shielding layer, and the heat insulating layer and outer woven layer between direct place 1 root thermocouple probe, and disposes thermocouple compensation line, and the outermost layer of cable extruded and covered sheath. The utility model can demand according to actual environment to the graphene in cable and apply current, and the temperature control current is fed back through thermocouple monitoring, and the graphene has excellent conductivity and thermal conductivity, which makes its electric-thermal conversion rate high, heating safe and stable. The cable is especially suitable for ice and snow environment under power transmission and distribution line current transmission. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 It is structural schematic diagram of example.

[0029] Fig. 2 It is structural schematic diagram of inner woven layer inside setting nylon mesh cloth and hot melt adhesive.

[0030] Fig. 1, expansion conductor; 2, inner layer semiconductive shielding layer; 3, insulation layer; 4, outer layer semiconductive shielding layer; 5, inner woven layer; 6, thermocouple compensation line; 6-1, conductor; 6-2, polytetrafluoroethylene insulation layer; 7, outer woven layer; 8, sheath; 9, nylon mesh cloth; 10, hot melt adhesive. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0032] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a particular orientation, construct and operate with a particular orientation, therefore cannot be understood as the limitation of the utility model;The term "first", "second", "third" is only for the purpose of description, and cannot be understood as indicating or implying relative importance;In addition, unless otherwise explicitly specified and limited, the term "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0033] Embodiment 1

[0034] As Figs. 1-2 shown, a self-heating energy-saving high-voltage overhead cable comprises:

[0035] The diameter-expanding conductor 1;

[0036] The inner semiconductive shielding layer 2 is coated on the diameter-expanding conductor 1;

[0037] The insulating layer 3 is coated on the inner semiconductive shielding layer 2;

[0038] The outer semiconductive shielding layer 4 is coated on the insulating layer 3;

[0039] The inner braided layer 5 is made of heat-insulating material and coated on the outer semiconductive shielding layer 4;

[0040] The outer braided layer 7 is made of electric heating material and coated on the inner braided layer 5;

[0041] The sheath 8 is coated on the outer braided layer 7.

[0042] With such a structure, the inner semiconductive shielding layer 2 fills the fine unevenness on the surface of the diameter-expanding conductor 1, forms a smooth equipotential surface, and makes the electric field uniformly distributed along the insulating layer 3, avoiding partial discharge or breakdown.

[0043] The inner semiconductive shielding layer 2 and the outer semiconductive shielding layer 4 are closely combined with the insulating layer, eliminating air gap and preventing partial discharge;The outer semiconductive shielding layer 4 is grounded, releasing the induced charge on the surface of the insulating layer 3 and avoiding the risk of electric shock.

[0044] The insulating layer 3 is covered in the middle to be effectively protected;

[0045] The inner braided layer 5 uses heat insulation material to protect the inside from the influence of the electric heating material;

[0046] The outer braided layer 7 uses electric heating material, and the electric heating can heat the sheath, which is conducive to the ice removal on the surface of the sheath.

[0047] In the embodiment, the expanded diameter wire 1 is made of copper alloy core pipe stranded wire.

[0048] In the embodiment, the inner layer semiconductive shielding layer 2 and the outer layer semiconductive shielding layer 4 are made of polyethylene or ethylene copolymer as the base material, and carbon black is added.

[0049] In the embodiment, the insulating layer 3 is made of cross-linked polyethylene.

[0050] In the embodiment, the inner braided layer 5 is made of glass fiber wire.

[0051] In the embodiment, the outer braided layer 7 is made of graphene fiber wire.

[0052] In the embodiment, the sheath 8 is made of weather-resistant material.

[0053] In the embodiment, the thermocouple compensation wire 6 is arranged between the inner braided layer 5 and the outer braided layer 7.

[0054] In the embodiment, the thermocouple compensation wire 6 is made of a conductor 6-1 externally extruded with a layer of polytetrafluoroethylene ethylene propylene insulating layer 6-2, wherein the positive electrode is a nichrome alloy wire conductor, and the negative electrode is a nickel-silicon alloy wire conductor; the thermocouple probe formed by short-circuiting the positive and negative electrode conductors is embedded in the cable.

[0055] The thermocouple is a temperature sensor that measures temperature through the thermoelectric effect. The corresponding instrument is connected through the thermocouple compensation wire 6 to obtain temperature data. Through the obtained temperature data, the size of the heating current can be adjusted accordingly.

[0056] In the embodiment, the thermocouple compensation wire 6 is arranged between the inner braided layer 5 and the outer braided layer 7.

[0057] With such structure, the temperature stress between the outer semiconductive shielding layer 4 and the inner woven layer 5 is prevented from affecting the deformation, such as the internal heat generated by the conductor, which can cause the insulation layer to expand, and the outer semiconductive shielding layer is easily pressed by the expansion of the inner woven layer, and the inner woven layer is a glass fiber filament, which has small or no deformation capacity when heated, and is easily expanded and broken, and the nylon mesh cloth separates the woven layer from the outer semiconductive shielding layer, and the hot melt adhesive has a certain deformation capacity and can be pressed, and has a buffering effect, and the nylon mesh cloth provides a hot melt adhesive attachment skeleton, which is beneficial to resist shear force and protect the inner woven layer from being expanded and broken.

[0058] The utility model mainly is through giving outer woven layer electric current, the heat generated is diffused to the sheath fast, makes the surface of overhead cable sustained heat preservation, thereby make the sheath surface moisture not easy condensation forms ice block, in the promotion winter power grid power supply reliability not because insulation temperature rise and influence cable life. The cable characteristics is by high strength's copper alloy expansion pipe constitutes the conductive core of cable, in the conductor outside in turn extrusion coating inner semiconductive shielding layer, insulation layer, outer semiconductive shielding layer, set up inner woven layer as heat insulation layer in outer semiconductive shielding layer, heat insulation layer and outer woven layer between direct place 1 root thermocouple probe, and the layout thermocouple compensation line, the outermost layer of cable extrusion coating sheath. The utility model can demand according to actual environment to the graphene in cable and apply electric current, and through thermocouple monitoring feedback temperature control electric current, and the graphene has excellent conductivity and thermal conductivity, which makes its electric-thermal conversion rate high, and heating is safe and stable. The cable is especially suitable for ice and snow environment under power transmission and distribution line current transmission.

[0059] The above content is a further detailed description of the utility model made in combination with specific preferred embodiments, and cannot be determined that the specific implementation of the utility model is limited to these descriptions. For those skilled in the art to which the utility model belongs, without departing from the concept of the utility model, a number of equivalent substitutions or obvious modifications can be made, and the performance or use is the same, which should be regarded as belonging to the protection scope of the utility model.

Claims

1. A self-heating, energy-saving high-voltage overhead cable, characterized in that... include: Expanded diameter conductor (1); An inner semi-conductive shielding layer (2) is wrapped around the expanded diameter wire (1); An insulating layer (3) is wrapped around an inner semiconductive shielding layer (2); An outer semiconductive shielding layer (4) is wrapped around an insulating layer (3); The inner braided layer (5) is made of heat-insulating material and is wrapped around the outer semi-conductive shielding layer (4); The outer braided layer (7) is made of electrically heated material and is wrapped around the inner braided layer (5); Sheath (8) covers the outer braided layer (7).

2. The self-heating energy-saving high-voltage overhead cable according to claim 1, characterized in that... The expanded diameter conductor (1) is made of copper alloy core tube stranded conductor.

3. The self-heating energy-saving high-voltage overhead cable according to claim 1, characterized in that... The insulating layer (3) is made of cross-linked polyethylene.

4. The self-heating energy-saving high-voltage overhead cable according to claim 1, characterized in that... The inner braided layer (5) is made of glass fiber filaments.

5. The self-heating energy-saving high-voltage overhead cable according to claim 1, characterized in that... The outer braided layer (7) is made of graphene fiber filaments.

6. The self-heating energy-saving high-voltage overhead cable according to claim 1, characterized in that... The sheath (8) is made of weather-resistant material.

7. The self-heating energy-saving high-voltage overhead cable according to claim 1, characterized in that... Thermocouple compensation wires (6) are laid between the inner braided layer (5) and the outer braided layer (7).

8. The self-heating energy-saving high-voltage overhead cable according to claim 7, characterized in that... The thermocouple compensation line (6) is made by extruding a layer of polytetrafluoroethylene propylene insulation layer (6-2) around a conductor (6-1), wherein the positive electrode is a nickel-chromium alloy wire conductor and the negative electrode is a nickel-silicon alloy wire conductor; the thermocouple probe formed by short-circuiting the positive and negative conductors is embedded in the cable.

9. The self-heating energy-saving high-voltage overhead cable according to claim 1, characterized in that... Hot melt adhesive (10) and nylon mesh fabric (9) are provided between the outer semiconductive shielding layer (4) and the inner braided layer (5) for fixation, and the nylon mesh fabric (9) is attached to the inner braided layer (5).

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