CN111477399A

CN111477399A - Optical fiber temperature sensing intelligent power supply cable

Info

Publication number: CN111477399A
Application number: CN202010421392.4A
Authority: CN
Inventors: 王子纯; 吴荣美; 唐秀芹; 徐亚东; 袁海峰; 韩桂平
Original assignee: Jiangsu Dongqiang Co Ltd
Current assignee: Jiangsu Dongqiang Co Ltd
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2020-07-31
Also published as: CN112750565B; CN112750565A

Abstract

The invention discloses an optical fiber temperature-sensing intelligent power supply cable, which comprises a conductor cable core and an insulating layer, wherein the ratio of the thickness of the insulating layer to the rated voltage is 0.4 mm/kv-0.45 mm/kv; the steel wire armor layer is at least provided with a temperature measuring optical fiber in an inserting way, the temperature measuring optical fiber is positioned in the holding grooves of the holding steel wires at two adjacent sides, and the adjacent armor steel wires are respectively movably connected in sequence through the corresponding steel wire tenon and the corresponding steel wire mortise; the metal outer pipe is sleeved on the periphery of the temperature measurement optical fiber heat conduction layer at intervals, and the heat conduction filling paste between the heat conduction layer and the metal outer pipe comprises the following components in percentage by weight: 18-20% of gelling agent, 3-5% of oil separation inhibitor, 1-2% of antioxidant, 2-2.5% of water absorbent, 0.0015-0.002% of defoaming agent and the balance of heat conducting oil. The intelligent power supply cable not only can realize safe transmission of electric energy, but also can realize accurate real-time intelligent monitoring of the operation condition of the power load of the cable.

Description

Optical fiber temperature sensing intelligent power supply cable

Technical Field

The invention relates to the technical field of power cables, in particular to a power cable capable of accurately and timely monitoring the operating temperature of the cable.

Background

Power cables are used in power system trunk lines to transmit and distribute high power electrical energy cable products. With the continuous expansion of the application field of power cables, the laying environment of the power cables becomes more complex, and the power cables are developed from pure power and electric energy transmission to multifunctional and multipurpose directions. The application quantity of the power cables in the railway power supply line is increased day by day, and the working running state of the power cables determines the power supply quality and the power supply safety to a great extent; the method has the advantages of preventing cable faults, reducing the fault rate of the cable in operation, improving the reliability of power supply of the cable, and being particularly important for safe and efficient operation of railways.

The cable core of the power cable can generate heat under the action of the self-resistance through larger current, the longer the time is, the higher the temperature is, the larger the resistance is, the easier the heating is, which not only can cause power transmission loss, but also can cause the insulating material to degrade, damage the cable, even cause safety accidents such as fire and the like, so the operating temperature of the cable is an extremely important parameter for representing the operating state of the power cable, and when the cable breaks down, the temperature value near the fault point also rises or falls along with the operating temperature. Because the power cable is often buried and has great concealment, great difficulty is brought to the detection of faults and the accurate positioning of distances. The method attaches importance to the fault detection and diagnosis of the power cable, accurately positions the fault point of the power cable by using an advanced detection technology, maintains the power cable in time, makes safety protection measures and is extremely important to the overall operation of a power system.

The optical fiber temperature measurement technology is applied to monitoring of the operating temperature of the power cable, is a real-time, on-line and multi-point optical fiber temperature measurement technology, can monitor a space temperature field in real time, can continuously measure measuring points along an optical fiber line in real time, and is resistant to electromagnetic interference. However, when the temperature measuring optical fiber is placed in the power cable for temperature measurement, because the power cable can be stretched, extruded and bent during laying or using, various mechanical damages to the optical fiber can be caused, and the working posture of the optical fiber can be damaged, so that the temperature measuring optical fiber generates polarized light and generates larger temperature measuring errors.

Disclosure of Invention

The invention aims to solve the technical problem of providing an optical fiber temperature-sensing intelligent power supply cable which not only can realize the safe transmission of electric energy, but also can realize the accurate real-time intelligent monitoring of the power load running condition of the cable, ensures the synchronization of power supply and on-line monitoring, and has reasonable structure and reliable use.

In order to solve the technical problem, the optical fiber temperature sensing intelligent power supply cable comprises a conductor cable core, wherein the conductor cable core is formed by twisting a plurality of metal conductor monofilaments, a conductor shielding layer, an insulating layer and an insulating shielding layer are sequentially arranged outside the conductor cable core, the insulating shielding layer is provided with the shielding layer, the shielding layer is provided with an isolation sleeve, the periphery of the isolation sleeve is provided with a steel wire armoring layer, a wrapping tape layer is wrapped on the steel wire armoring layer, and the ratio of the thickness of the insulating layer to the rated voltage is 0.4 mm/kv-0.45 mm/kv; the steel wire armor layer comprises a plurality of armor steel wires which are sequentially arranged along the periphery of the isolation sleeve, at least one temperature measuring optical fiber is inserted into the steel wire armor layer and is positioned in holding grooves of the holding steel wires at two adjacent sides, the holding groove at the other side of the holding steel wire is movably connected with steel wire tenons of the adjacent armor steel wires, and the adjacent armor steel wires are respectively and sequentially movably connected through the corresponding steel wire tenons and steel wire mortises; the temperature measuring optical fiber comprises a temperature measuring fiber core and an optical fiber cladding coated on the outer side of the temperature measuring fiber core, a heat conducting layer is coated on the optical fiber cladding, a metal outer pipe is sleeved on the periphery of the heat conducting layer at intervals, and heat conducting filling paste is filled between the heat conducting layer and the metal outer pipe; the heat-conducting filling paste comprises the following components in percentage by weight: 18-20% of gelling agent, 3-5% of oil separation inhibitor, 1-2% of antioxidant, 2-2.5% of water absorbent, 0.0015-0.002% of defoaming agent and the balance of heat conducting oil.

Due to the adoption of the technical scheme, the invention has the following remarkable advantages:

Firstly, the temperature measuring optical fiber is positioned in the holding groove of the holding steel wire at two sides of the holding steel wire, the holding steel wire is movably connected with the armored steel wire in a joggle joint mode, and the armored steel wires are also movably connected with each other in a joggle joint mode, so that on one hand, the temperature measuring optical fiber and the holding steel wire form surface contact instead of line contact in the traditional structure, the heat of the holding steel wire can be more uniformly transferred to the temperature measuring optical fiber, the temperature measuring optical fiber can accurately reflect the temperature of an armored layer, on the other hand, the holding steel wire and the armored steel wire also form a hinged joint structure in surface contact, the heat of a cable can be uniformly transferred in the armored layer of the steel wire, a uniform temperature field is formed on the armored layer of the steel wire, the temperature measuring optical fiber can detect the actual operating temperature of the cable, the accurate monitoring of the temperature measuring optical fiber on the, The temperature measurement of multiple spot, the precision is high, can realize automatic measurement and on-line temperature monitoring, is favorable to the intelligent management of cable. Especially, the armor structure formed by the joggling mode greatly increases the mechanical strength of the cable, such as tensile strength, compressive strength and the like, improves the anti-corrosion capability of the cable, and protects and prolongs the use safety of the cable.

The sheath of the temperature measurement optical fiber unit adopts the heat conduction structure and the sheath structure, the sheath structure effectively enhances the mechanical properties of tensile strength, compression resistance and the like of the optical fiber, and forms a reliable and stable protection function, particularly, the heat conduction layer and the heat conduction filling paste in the heat conduction structure improve the heat conduction effect of the optical fiber sheath, and enhance the heat sensitivity and the monitoring sensitivity of the optical fiber, the heat conduction oil has good heat conduction performance, the optical fiber is uniformly heated, the temperature measurement data is more accurate, water and moisture are effectively prevented from permeating into the inner part, the transmission loss of the optical fiber is effectively avoided, and the temperature monitoring quality and the service life of the optical fiber are ensured. The heat-conducting filling paste meets the requirements of good heat conductivity, and simultaneously has good mechanical properties of vibration reduction, bending resistance, tensile resistance and the like for the optical fiber, and has double technical effects of heat conduction and protection.

The ratio of the insulation thickness of the cable core conductor to the rated voltage is controlled to be 0.4 mu/kv-0.45 mu/kv, the insulation breakdown of the cable is easily caused by the excessively thin insulation thickness, the insulation effect of the cable is lost, and the power transmission accident is caused, while the excessively thick insulation layer not only increases the laying difficulty and the cost of the cable, but also is not beneficial to the dissipation of the operation heat of the cable, reduces the power transmission efficiency, and increases the laying space of the cable. The cable insulation thickness is reasonably controlled within a certain numerical range according to the rated voltage of the cable, so that the cable has better insulation safety, electric energy transmission efficiency and cable cost.

In a preferred embodiment of the present invention: two temperature measuring optical fibers are inserted and arranged in the steel wire armor layer. The structure is reasonable, and reliable and stable operation of the temperature measuring optical fiber can be guaranteed.

In a preferred embodiment of the present invention, the shielding layer is formed by overlapping and wrapping pure copper tapes, and the wrapping overlapping rate of the pure copper tapes is 15% to 25%. Is convenient for manufacturing and production and has good shielding performance.

In a further embodiment of the invention, the holding grooves on both sides of the holding steel wire are arc grooves, and the inner diameter of each arc groove corresponds to the outer diameter of the temperature measuring optical fiber; one side of the armored steel wire is provided with a steel wire tenon, the other side of the armored steel wire is provided with a steel wire mortise, the steel wire tenon is an arc tenon strip, the steel wire mortise is an arc groove, and the shape of the steel wire tenon is matched with that of the steel wire mortise. The processing production is convenient, and the steel wire joggle is stable.

In a further embodiment of the present invention, the heat conductive filling paste comprises the following components by weight: 72% of heat conduction oil, 20% of gelling agent, 4% of oil separation inhibitor, 1.5% of antioxidant, 0.0018% of defoaming agent and the balance of water absorbent. The heat conduction oil is synthetic heat conduction oil, the gelling agent is fumed silica, the antioxidant is an alkylphenol antioxidant, the oil separation inhibitor is ethylene propylene rubber or a diblock polymer, the water absorbent is silica gel, and the defoaming agent is emulsified silicone oil. Has good heat transfer performance and heat conduction effect.

In a preferred embodiment of the present invention, the conductor shielding layer and the insulation shielding layer are formed by extruding peroxide cross-linked semiconductive shielding material, and the insulation layer is formed by extruding peroxide cross-linked polyethylene insulation material. Has extremely insulating property and uniform electric field.

In a preferred embodiment of the invention, the wrapping tape layer is extruded with an inner sheath, and the inner sheath is extruded with an outer sheath. The isolation sleeve is formed by extruding and wrapping low-smoke halogen-free flame-retardant polyolefin materials. The wrapping band layer is formed by wrapping a glass fiber band. It is rational in infrastructure to make cable sheath form multiple protect function, strengthen cable comprehensive properties greatly, make the cable more can adapt to multiple abominable application environment.

Drawings

The optical fiber temperature-sensing intelligent power supply cable of the invention is further described in detail with reference to the accompanying drawings and the detailed description.

FIG. 1 is a schematic cross-sectional view of an embodiment of an optical fiber temperature-sensing intelligent power supply cable according to the present invention;

FIG. 2 is a schematic cross-sectional view of the temperature measuring fiber of the structure of FIG. 1;

FIG. 3 is a schematic partial structural view of a wire armor of the structure of FIG. 1;

FIG. 4 is a schematic cross-sectional view of the gripping wire of the structure shown in FIG. 3;

Fig. 5 is a schematic sectional structure view of the armor wires in the structure shown in fig. 3.

In the figure, 1-conductor cable core, 2-conductor shielding layer, 3-insulating layer, 4-insulating shielding layer, 5-shielding layer, 6-isolation sleeve, 7-steel wire armor layer, 71-armor steel wire, 72-holding steel wire, 73-holding groove, 74-steel wire tongue-and-groove, 75-steel wire tenon, 8-temperature measuring optical fiber, 81-temperature measuring fiber core, 82-temperature measuring cladding, 83-heat conducting layer, 84-heat conducting ointment, 85-metal outer pipe, 9-wrapping tape layer, 10-inner sheath, and 11-outer sheath.

Detailed Description

As shown in fig. 1, a conductor cable core 1 of the optical fiber temperature-sensing intelligent power supply cable is formed by twisting a plurality of pure copper metal conductor monofilaments, for example, the conductor cable core 1 is formed by twisting 14, 19 or 60 copper monofilaments, the diameter of each monofilament conductor is 2.6mm or 2.93mm, the copper monofilaments are twisted in multiple layers, and the twisting direction and the pitch-diameter ratio of the adjacent two layers of monofilament conductors are different. The conductor cable comprises a conductor cable core 1, and is characterized in that a conductor shielding layer 2, an insulating layer 3 and an insulating shielding layer 4 are sequentially coated on the periphery of the conductor cable core from inside to outside, the conductor shielding layer 2 and the insulating shielding layer 4 are formed by extruding peroxide cross-linked semi-conductive shielding materials, the insulating layer 3 is formed by extruding peroxide cross-linked polyethylene insulating materials, and the conductor shielding layer 2, the insulating layer 3 and the insulating shielding layer 4 are realized by adopting a three-layer co-extrusion coating process. The conductor shielding layer 2 and the insulation shielding layer 4 have the functions of homogenizing an electric field and stabilizing the performance of the cable. In order to maintain the cable with safe and reasonable cable insulation strength, the thickness b of the insulating layer 3 is related to the rated voltage (kv) of the cable, in the embodiment, the thickness b =11mm of the insulating layer 3, the rated voltage of the cable is 25kv, and the ratio of the thickness b of the insulating layer 3 to the rated voltage is 0.44 mm/kv.

Be provided with shielding layer 5 on insulating shield layer 4, this shielding layer 5 is formed by the overlapping of pure copper strip around the package, and this pure copper strip's the overlapping rate of winding is 15% -25%. The shielding layer 5 is provided with an isolation sleeve 6, and the isolation sleeve 6 is formed by extruding and wrapping low-smoke halogen-free flame-retardant polyolefin materials and has the flame-retardant and waterproof effects. The steel wire armor layer 7 is arranged on the periphery of the isolation sleeve 6, the steel wire armor layer 7 is formed by arranging special-shaped carbon steel wires, two temperature measuring optical fibers 8 are arranged between the special-shaped carbon steel wires of the steel wire armor layer 7 in an inserting mode, and the two temperature measuring optical fibers 8 are located on the same diameter of the cross section of the cable. A wrapping tape layer 9 is wrapped on the steel wire armor layer 7, and the wrapping tape layer 9 is formed by wrapping a glass fiber tape. An inner sheath 10 is extruded on the wrapping tape layer 9, and an outer sheath 11 is extruded on the inner sheath 10; the inner sheath 10 is extruded by low-smoke halogen-free flame-retardant polyolefin material, and the outer sheath 11 is extruded by nylon material.

As shown in fig. 2, the temperature measuring optical fiber 8 includes a temperature measuring fiber core 81, a temperature measuring cladding 82 is coated outside the temperature measuring fiber core 81, a heat conducting layer 83 is coated on the temperature measuring cladding 82, the heat conducting layer 83 is formed by coating heat conducting silica gel, a metal outer tube 85 is sleeved on the outer periphery of the heat conducting layer 83 at intervals, the metal outer tube 85 is a copper corrugated tube, and a heat conducting filling paste 84 is filled between the metal outer tube 85 and the heat conducting layer 83.

The heat conductive filling paste 84 is prepared from the following components, and the examples are as follows:

The first embodiment is as follows: the heat-conducting filling paste 84 comprises the following components in percentage by weight: 72% of heat conduction oil, 20% of gelling agent, 4% of oil separation inhibitor, 1.5% of antioxidant, 0.0018% of defoaming agent and the balance of water absorbent. The heat conducting oil is synthetic heat conducting oil, the gelatinizing agent is fumed silica, the antioxidant is an alkylphenol antioxidant, the oil separating inhibitor is ethylene propylene rubber or water absorbent is silica gel, and the defoaming agent is emulsified silicone oil.

Example two: the heat-conducting filling paste 84 comprises the following components in percentage by weight: 72.5 percent of heat conduction oil, 18 percent of gelling agent, 5 percent of oil separation inhibitor, 2 percent of antioxidant, 0.002 percent of defoaming agent and the balance of water absorbent. The heat conducting oil is synthetic heat conducting oil, the gelatinizing agent is fumed silica, the antioxidant is an alkylphenol antioxidant, the oil separating inhibitor is a double-block high polymer, the water absorbent is silica gel, and the defoaming agent is emulsified silicone oil.

As shown in fig. 3, the wire sheath 7 is formed by surrounding a profiled sheath wire 71 and a grip wire 72, the sheath wire 71 and the grip wire 72 are profiled carbon wires, and the sheath wire 71 and the grip wire 72 are arranged in this order on the outer periphery of the insulating sheath 6; the temperature measuring optical fiber 8 is inserted between the two opposite holding steel wires 72. In the embodiment, two temperature measuring optical fibers 8 are arranged in the steel wire armor layer 7 in an inserting manner, so the steel wire armor layer 7 comprises four holding steel wires 72, the rest are armor steel wires 71, and the armor steel wires 71 and the holding steel wires 72 are both in special-shaped cross section structures; the outer end surface of the armor wire 71 and the outer end surface of the holding wire 72 are substantially on the same cylindrical surface, and the inner end surface of the armor wire 71 and the inner end surface of the holding wire 72 are also substantially on the same cylindrical surface.

As shown in fig. 4, the outer end surface and the inner end surface of the holding steel wire 72 are arc surfaces, both side surfaces of the holding steel wire 72 are concave holding grooves 73, and the two holding grooves 73 face opposite to each other; the holding groove 73 is an arc groove, and the radius of the arc groove is equivalent to and corresponds to the radius of the temperature measuring optical fiber 8. The temperature measuring optical fiber 8 is inserted into the holding grooves 73 of two adjacent holding steel wires 72. The holding groove 73 on the other side of the holding steel wire 72 is movably connected with the steel wire tenon 75 of the adjacent armor steel wire 71.

As shown in fig. 5, the outer end surface and the inner end surface of the armor steel wire 71 are arc surfaces, one side surface of the armor steel wire 71 is a steel wire mortise 74, the other side surface is a steel wire tenon 75, the steel wire tenon 75 is matched with the steel wire mortise 74 in shape, and the adjacent armor steel wires 71 are respectively and movably connected in sequence through the corresponding steel wire tenon 75 and the corresponding steel wire mortise 74.

Some preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and many modifications and changes can be made without departing from the basic principle of the present invention. For example, the temperature measuring optical fibers inserted and arranged in the steel wire armor layer are not limited to two, and can be one, three or four; the coating layer of the cable is not limited to the above-mentioned embodiments, and other functional coating layers may be inserted between the layers according to the use requirements and environment of the cable, and so on. Such modifications and variations are intended to fall within the scope of the present invention.

Claims

1. The utility model provides an optic fibre temperature sensing intelligence supply cable, including conductor cable core (1), this conductor cable core (1) is formed by a plurality of metallic conductor monofilament transposition, be equipped with conductor shielding layer (2) outward in conductor cable core (1) in proper order, insulating layer (3) and insulation shielding layer (4), be provided with shielding layer (5) on insulation shielding layer (4), be provided with on this shielding layer (5) separation sleeve (6), be provided with steel wire armor (7) in the periphery of separation sleeve (6), it has around band layer (9) to wind on steel wire armor (7), its characterized in that: the ratio of the thickness of the insulating layer (3) to the rated voltage is 0.4 mm/kv-0.45 mm/kv; the steel wire armor layer (7) comprises a plurality of armor steel wires (71) which are sequentially arranged along the periphery of the isolation sleeve (6), at least one temperature measuring optical fiber (8) is inserted into the steel wire armor layer (7), the temperature measuring optical fiber (8) is positioned in holding grooves (73) of holding steel wires (72) on two adjacent sides, the holding groove (73) on the other side of the holding steel wire (72) is movably connected with steel wire tenons (75) of the adjacent armor steel wires (71), and the adjacent armor steel wires (71) are respectively and sequentially movably connected with the steel wire tenon grooves (74) through the corresponding steel wire tenons (75); the temperature measurement optical fiber (8) comprises a temperature measurement fiber core (81) and an optical fiber cladding (82) coated on the outer side of the temperature measurement fiber core (81), a heat conduction layer (83) is coated on the optical fiber cladding (82), metal outer tubes (85) are sleeved on the periphery of the heat conduction layer (83) at intervals, and heat conduction filling paste (84) is filled between the heat conduction layer (83) and the metal outer tubes (85); the heat-conducting filling paste (84) comprises the following components in percentage by weight: 18-20% of gelling agent, 3-5% of oil separation inhibitor, 1-2% of antioxidant, 2-2.5% of water absorbent, 0.0015-0.002% of defoaming agent and the balance of heat conducting oil.

2. The optical fiber temperature-sensing intelligent power supply cable according to claim 1, wherein: two temperature measuring optical fibers (8) are inserted into the steel wire armor layer (7).

3. The optical fiber temperature-sensing intelligent power supply cable according to claim 1, wherein: the shielding layer (5) is formed by lapping pure copper strips in an overlapping mode, and the lapping overlapping rate of the pure copper strips is 15% -25%.

4. The optical fiber temperature-sensing intelligent power supply cable according to claim 1, wherein: the holding grooves (73) on the two sides of the holding steel wire (72) are arc grooves, and the inner diameter of each arc groove corresponds to the outer diameter of the temperature measuring optical fiber (8); one side of the armor steel wire (71) is provided with a steel wire tenon (75), the other side of the armor steel wire (71) is provided with a steel wire mortise (74), the steel wire tenon (75) is an arc tenon strip, the steel wire mortise (74) is an arc groove, and the steel wire tenon (75) is matched with the steel wire mortise (74) in shape.

5. The optical fiber temperature-sensing intelligent power supply cable according to claim 1, wherein: the heat-conducting filling paste (84) comprises the following components in percentage by weight: 72% of heat conduction oil, 20% of gelling agent, 4% of oil separation inhibitor, 1.5% of antioxidant, 0.0018% of defoaming agent and the balance of water absorbent.

6. The optical fiber temperature-sensing intelligent power supply cable according to claim 5, wherein: the heat conduction oil is synthetic heat conduction oil, the gelling agent is fumed silica, the antioxidant is an alkylphenol antioxidant, the oil separation inhibitor is ethylene propylene rubber or a diblock polymer, the water absorbent is silica gel, and the defoaming agent is emulsified silicone oil.

7. The optical fiber temperature-sensing intelligent power supply cable according to claim 1, wherein: the conductor shielding layer (2) and the insulation shielding layer (4) are formed by extruding peroxide cross-linked semi-conductive shielding materials, and the insulation layer (3) is formed by extruding peroxide cross-linked polyethylene insulation materials.

8. The optical fiber temperature-sensing intelligent power supply cable according to claim 1, wherein: an inner sheath (10) is extruded on the wrapping tape layer (9), and an outer sheath (11) is extruded on the inner sheath (10).

9. The optical fiber temperature-sensing intelligent power supply cable according to claim 1, wherein: the isolation sleeve (6) is formed by extruding and wrapping low-smoke halogen-free flame-retardant polyolefin materials.

10. The optical fiber temperature-sensing intelligent power supply cable according to claim 1, wherein: the wrapping band layer (9) is formed by wrapping a glass fiber band.