Intelligent early warning cable

Abstract

The utility model discloses an intelligent early warning cable, which comprises a power line insulation wire core arranged in a first belting layer, the power line insulation wire core comprises a conductor and an insulation layer coated outside the conductor, and a temperature measuring element is arranged in the conductor; an armor layer is arranged outside the first belting layer, and a vibration measuring element is arranged in the armor layer; and an isolating layer is arranged between the first belting layer and the armor layer. The temperature measuring element with the temperature measuring function is arranged on the outermost layer of the conductor, so that the temperature of the cable conductor can be monitored more accurately; the vibration measurement element with the vibration measurement function is arranged in the armor layer, and the isolation layer is arranged between the first belting layer and the armor layer, so that an electromagnetic field generated by the cable in the first belting layer under the conditions of high voltage and large current can be isolated, and the problem that the electromagnetic field interferes optical signal transmission in the vibration optical fiber is avoided; the vibration signal can be accurately detected, and the detection accuracy is prevented from being influenced by deviation.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of early warning cable, specifically relates to an intelligent early warning cable. BACKGROUND

[0002] The statements herein only provide background technology related to the utility model, and do not necessarily constitute prior art.

[0003] With the continuous development and maturity of 5G technology, intelligent devices at home and abroad have also developed rapidly, especially in recent years, after the upgrading of various devices, intelligent devices have data acquisition, various data monitoring and other functions, and the supporting power cable has also undergone subtle changes. The fields of chemical industry and aerospace gradually require higher safety for power transmission, and a series of online monitoring functions are required for the cable body to ensure the safe and stable operation of power. For example, timely monitoring function requirements are proposed for the temperature, surrounding vibration and load flow of the cable body, and functions such as cable body over-temperature alarm and precise positioning of over-temperature are expected to be realized.

[0004] At present, the common method for temperature measurement of power transmission cables in the industry is as follows: the power cable adopts a conventional power cable, the power cable is first laid in the bridge, and then a temperature measurement optical fiber and a vibration measurement optical fiber are laid on the surface of the cable, which are bundled every meter with a ribbon, and finally the optical fiber is connected to the DTS, the distributed temperature measurement system host, and the DAS vibration measurement host, to realize temperature measurement on the surface of the cable.

[0005] The defects of traditional power cable temperature measurement and vibration measurement are summarized as follows:

[0006] (1) Since the temperature measurement optical fiber is laid on the surface of the cable, only the temperature of the surface of the cable is detected, and the temperature inside the cable, especially the temperature outside the insulation, is not truly monitored, so the temperature inside the cable cannot be truly reflected;

[0007] (2) The temperature measurement optical fiber is laid on the surface of the cable and bundled every 1m with a ribbon, so the temperature measurement optical fiber cannot be fully combined with the surface of the cable, which cannot accurately reflect the temperature of the surface of the cable and cannot continuously monitor the temperature of the surface of the cable.

[0008] (3) Since the optical fiber cannot be perfectly contacted with the cable body during laying, it is easily disturbed and affected by the external environment, and the temperature measurement and vibration measurement are not accurate, such as the vibration caused by sunlight, wind, rain, vehicle driving, etc., which may cause false alarms of the system.

[0009] (4) Difficulty in installation and maintenance: the installation of the optical fiber on the surface of the power cable requires certain technology and experience, especially in complex environments such as cable overhead and buried, the installation difficulty is greater.

[0010] (5) Unable to detect internal faults: Vibration optical fibers mainly detect the running state of the cable by detecting the vibration on the surface of the cable, but for internal faults of the cable (such as damage to the insulation layer, conductor breakage, etc.), the vibration optical fiber cannot directly detect.

[0011] In order to solve the above problems, in recent years some cable companies have also developed a temperature measurement and vibration measurement cable. The method is to add temperature measurement optical fibers and vibration measurement optical fibers during the cabling process of the insulated core, and directly cable together with the insulated core to avoid the problems of inaccurate temperature measurement, inability to detect internal faults, etc. Although this method has certain progress, there are still some problems.

[0012] The improved cable still has obvious temperature measurement and vibration measurement defects, which are summarized as follows:

[0013] (1) The temperature measurement optical fiber and the vibration measurement optical fiber cable are circular, and the power cable insulated core is also circular. The contact area between the two in the cable is also a small part. Even if the temperature and vibration can be collected, it is only collected at a certain point on the surface of the power cable insulated core, and cannot accurately and quickly reflect the temperature and vibration of the cable insulation surface.

[0014] (2) During the cabling process, soft filling materials such as polypropylene PP network filling are used. During the cabling process, the temperature measurement and vibration measurement optical fibers will run out of position at any time, and cannot be in contact with the surface of the insulated core. There is a deviation in the temperature and vibration collection process. After the cable is cut transversely, it can be clearly seen and verified that the temperature measurement and vibration measurement optical fibers are sometimes in contact with the insulation surface, and sometimes there is a barrier of polypropylene PP filling. It cannot accurately reflect the real situation of temperature measurement and vibration measurement.

[0015] (3) There is an electromagnetic field around the cable, especially in the case of high voltage and large current. These electromagnetic fields may interfere with the optical signal transmission in the vibration optical fiber, causing the detected vibration signal to deviate and affecting the accuracy of the monitoring.

[0016] Although the temperature measurement cable and the vibration measurement cable in the industry have been studied and improved to a certain extent, they still cannot solve the problem of inaccurate temperature collection. Due to the existence of the above defects, they cannot meet the high performance requirements of accurate temperature measurement, timely feedback, over-temperature alarm, accurate vibration measurement, etc. for high safety performance power cables in the future, so a high-performance intelligent early warning cable needs to be developed. Practical new type content

[0017] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide an intelligent early warning cable to improve the temperature measurement and vibration measurement accuracy and sensitivity of the early warning cable, and to achieve the purpose of improving accurate positioning.

[0018] To achieve the above object, the utility model is through the following technical scheme to realize:

[0019] On the one hand, the utility model discloses a kind of intelligent early warning cables, including power line insulated wire core in first tape layer, the power line insulated wire core includes conductor and insulating layer covered in conductor, temperature measuring element is equipped in the conductor;Armour layer is provided outside first tape layer, vibration measuring element is provided in the armour layer;Isolation layer is provided between the first tape layer and armour layer.

[0020] In at least one embodiment, the conductor is twisted into a temperature measuring element and a plurality of composite copper wires, and the temperature measuring element is located at the outermost layer of the conductor.

[0021] In at least one embodiment, the temperature measuring element is a temperature measuring fiber optic cable with temperature measuring function.

[0022] In at least one embodiment, the temperature measuring fiber optic cable sequentially includes a multimode temperature measuring fiber core, a tight cladding layer and a spiral steel belt from inside to outside.

[0023] In at least one embodiment, a filling layer is provided in the space inside the first tape layer between the power line insulated wire core and the first tape layer.

[0024] In at least one embodiment, the armour layer is composed of vibration measuring elements and single-layer steel wire leftward wrapped on the isolation layer.

[0025] In at least one embodiment, the armour layer is composed of temperature measuring elements and double-layer steel wire wrapped on the isolation layer, specifically, the double-layer steel wire is rightward wrapped on the inner layer and leftward wrapped on the outer layer of the isolation layer, and the vibration measuring element is wrapped on the outermost layer; The sum of the gap between each layer of steel wire does not exceed the diameter of 1 steel wire.

[0026] In at least one embodiment, the vibration measuring element is a vibration measuring fiber optic cable with vibration measuring function.

[0027] In at least one embodiment, the vibration measuring fiber optic cable sequentially includes a single-mode fiber core, a tight cladding layer and a spiral steel belt from inside to outside.

[0028] In at least one embodiment, a second tape layer is provided outside the armour layer, and an outer sheath layer is provided outside the second tape layer.

[0029] The beneficial effects of the above technical scheme of the utility model are as follows:

[0030] 1) The intelligent early warning cable of the utility model can more accurately monitor the temperature of the cable conductor by arranging the temperature measuring element with temperature measuring function on the outermost layer of the conductor; the vibration measuring element with vibration measuring function is arranged in the armored layer, and the isolation layer is arranged between the first wrapping layer and the armored layer, which can isolate the electromagnetic field generated by the cable in the first wrapping layer under high voltage and large current, avoid the problem of electromagnetic field interference with optical signal transmission in the vibration optical fiber, accurately detect the vibration signal, avoid deviation, and affect the accuracy of detection.

[0031] 2) The intelligent early warning cable of the utility model greatly improves the mechanical strength of the temperature measuring optical fiber cable by arranging the spiral steel belt and the like structure outside the temperature measuring optical fiber core, ensures that the temperature measuring optical fiber cable has high mechanical strength during the twisting process with the conductor, and can realize normal production, laying and temperature warning of the cable.

[0032] 3) The intelligent early warning cable of the utility model greatly improves the mechanical strength of the vibration measuring optical fiber cable by arranging the vibration measuring optical fiber cable in the armored layer and arranging the spiral steel belt and the like structure outside the optical fiber core, ensures that the vibration measuring optical fiber cable has high mechanical strength during the process of being loosely wound with the steel wire, is not easy to scratch and break, and can realize normal production, laying and vibration warning of the cable. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings accompanying the specification of the utility model form a part of the utility model and serve to provide further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof serve to explain the utility model, and do not constitute an improper limitation on the utility model.

[0034] Figure 1 It is a structure schematic view of the intelligent early warning cable of the utility model.

[0035] In the drawing: 1. conductor; 2. insulating layer; 3. temperature measuring element; 4. filling layer; 5. first wrapping layer; 6. isolation layer; 7. armored layer; 8. vibration measuring element; 9. second wrapping layer; 10. outer sheath layer. DETAILED DESCRIPTION

[0036] It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation of the utility model. Unless otherwise specified, all technical and scientific terms used in the utility model have the same meaning as that generally understood by ordinary skilled persons in the technical field to which the utility model belongs.

[0037] As introduced in the background art, the purpose of the utility model is to overcome the deficiencies in the prior art, provide an intelligent early warning cable, improve the temperature measuring and vibration measuring accuracy and sensitivity of the early warning cable, and achieve the purpose of improving accurate positioning.

[0038] Example 1

[0039] As Figure 1 shown, the embodiment discloses a kind of intelligent early warning cable, including power line insulated core in first tape layer 5, power line insulated core includes conductor 1 and the insulating layer 2 covered in conductor, temperature measuring element 3 is equipped in conductor 1;First tape layer 5 is provided with armored layer 7, vibration measuring element 8 is arranged in armored layer 7;Isolation layer 6 is arranged between first tape layer 5 and armored layer 7.

[0040] In the embodiment, power line insulated core is composed of conductor 1 and the insulating layer 2 covered in conductor 1.Conductor 1 is twisted into according to certain rule with temperature measuring element 3, temperature measuring element 3 is located on the outermost layer of conductor 1.Copper wire 20 ℃ volume resistivity is not less than 0.017241 Ω.mm / m, and breaking elongation is controlled at 20%~30%.In the embodiment, the diameter of copper wire of conductor 1 is controlled in the range of 1.13mm~3.00mm.Power line insulated core uses XLPE material with excellent insulating resistance performance, and the volume resistivity can reach 1 × 1015 Ω.m at 20 ℃ environment, dielectric strength (50Hz, 20 ℃) is not less than 28kV / mm, and the condensation content is minimum 70%.

[0041] In the embodiment, temperature measuring element 3 is temperature measuring fiber optic cable with temperature measuring function.The temperature measuring fiber optic cable is sequentially from inside to outside multimode temperature measuring optical fiber core, tight jacket layer, spiral steel belt.In the embodiment, the outer diameter of temperature measuring fiber optic cable is 3.2mm±0.1mm, and the structure of temperature measuring fiber optic cable is sequentially from inside to outside multimode temperature measuring optical fiber core, 0.6mm tight jacket layer, spiral steel belt.The size type of temperature measuring fiber optic cable is 50 / 125um or 62.5 / 125um.

[0042] Further, the tensile strength of temperature measuring fiber optic cable is maximum 500N in installation process, and maximum 300N in use process;The compressive strength is maximum 5000N / 100mm in installation process, and maximum 3000N / 100mm in use process;Linear rolling force is 300N / cm, and causes 0-0.3mm variation.The minimum bending radius of temperature measuring fiber optic cable is 10 times the outer diameter of fiber optic cable in installation process, and 20D fiber optic cable outer diameter in use process.Temperature measuring fiber optic cable has anti-mesh bite, anti-vibration characteristics, protection characteristics, and good temperature conduction performance, to ensure rapid fire detection.

[0043] The multimode temperature measuring fiber core in the temperature measuring fiber optic cable adopts a nano metal ion scattering enhanced fiber, has a scattering window strengthening characteristic, hybrid metal nano ions are doped into the fiber, enhanced scattering light is generated, and the signal-to-noise ratio of the scattering light is greatly improved. In terms of the performance of the temperature measuring fiber, the fiber type is 50 / 125um (fiber core diameter is 50um, 125um glass cladding diameter) or 62.5 / 125um (fiber core diameter is 62.5um, 125um glass cladding diameter), two-core multimode fiber; the long-term detection temperature is -40~+85℃, and the maximum is 120℃ for 48 hours; the fiber loss is less than 1dB / km.

[0044] The spiral steel belt in the temperature measuring fiber optic cable adopts a high-strength steel belt with a thickness of 0.02~0.05mm, is spirally formed outside the fiber core, mainly plays a role of radial mechanical compression, and the compression strength can reach a level of 5000N / 100mm in the installation process and 3000N / 100mm in the use process, the linear rolling force is 300N / cm, the maximum causes a deformation ability of 0-0.3mm, and the influence of the mutual extrusion of the insulated cores on the temperature measuring fiber optic cable in the production process of the cable is avoided.

[0045] The insulating layer 2 coated outside the conductor 1 is made of cross-linked polyethylene XLPE material with excellent insulating resistance performance, the volume resistivity can reach 1x1015Ω·m at 20℃, the dielectric strength (50Hz, 20℃) is not less than 28kV / mm, and the condensation content is at least 70%.

[0046] In the embodiment, the filling layer 4 is arranged between the power line insulated cores and the first wrapping layer 5 in the internal space of the first wrapping layer 5, the filling layer 4 is arranged in the cable gap after the plurality of power line insulated cores are cabled, and polypropylene PP is generally used as the filling material, so that the cable core is finally formed in a round shape.

[0047] The first wrapping layer 5 is one or more wrapping tapes wrapped outside the insulated cores and the filling layer 4, the wrapping tape thickness is generally 0.1mm~0.25mm, and the overlap rate is controlled to be 10%~30%. The first wrapping layer 5 can be a tape made of glass fibers or a cloth tape made of fibers.

[0048] The isolation layer 6 is arranged outside the first wrapping layer 5, which is actually one or more plastic layers extruded outside the first wrapping layer 5. The plastic layer can be polyvinyl chloride material or halogen-free low-smoke polyolefin material. Preferably, the thickness of the isolation layer 6 is generally 1.0mm~2.0mm, and the thinnest point is controlled to be the nominal thickness of the sheath

[0049] 0.8mm. In this embodiment, the isolation layer 6 is made of halogen-free low-smoke polyolefin material, which can achieve the characteristics of halogen-free, low-smoke, flame-retardant, etc.

[0050] The armor layer 7 is provided outside the isolation layer 6, which is composed of the vibration sensing element 8 and single-layer steel wire wound around the isolation layer 6, or composed of the vibration sensing element 8 and double-layer steel wire wound around the isolation layer 6. When the double-layer structure is adopted, the inner layer of the double-layer steel wire is wound right around the isolation layer 6, and the outer layer is wound left around the isolation layer 6. The vibration sensing element 8 is wound around the outermost layer. The sum of the gaps between each layer of steel wire does not exceed the diameter of one steel wire. The wound steel wire can be galvanized steel wire or high-quality carbon steel wire or alloy steel wire, which needs to have a tensile strength of more than 1370 MPa.

[0051] The vibration sensing element 8 provided in the armor layer 7 is mainly a vibration sensing fiber optic cable with vibration sensing function. The vibration sensing fiber optic cable is composed of a single-mode fiber core, a tight wrapping layer, and a spiral steel belt from inside to outside. In this embodiment, the outer diameter of the vibration sensing fiber optic cable is 5.0mm±0.1mm. The structure of the vibration sensing fiber optic cable from inside to outside is: single-mode vibration sensing fiber core, 0.6mm tight wrapping layer, and spiral steel belt. The size type of the vibration sensing fiber optic cable is 9 / 125um.

[0052] The tensile strength of the vibration sensing fiber optic cable is maximum 600N during installation and maximum 400N during use. The tensile strength is maximum 600N during installation and maximum 500N during use. The compressive strength is maximum 5000N / 100mm during installation and maximum 3000N / 100mm during use. Further, the minimum bending radius of the vibration sensing fiber optic cable is 10 times the outer diameter of the fiber optic cable during installation and 20D of the outer diameter of the fiber optic cable during use. The vibration sensing fiber optic cable has the characteristics of anti-meshing, anti-seismic, and protection, as well as good vibration conduction performance, to ensure fast vibration detection.

[0053] The single-mode vibration sensing fiber core in the vibration sensing fiber optic cable adopts a nano metal ion scattering enhanced fiber, which has the characteristic of scattering window enhancement. The mixed metal nano ion is doped into the fiber to generate enhanced scattered light, which greatly improves the signal-to-noise ratio of the scattered light. In terms of the performance of the vibration sensing fiber optic cable, the fiber type is 9 / 125um (fiber core diameter is 9um, and glass cladding diameter is 125um), two-core single-mode fiber; the long-term detection temperature is -40~+85℃, and the maximum is 120℃ for 48 hours; the fiber loss is less than 1dB / km.

[0054] The spiral steel belt in the vibration measuring optical fiber cable adopts a high-strength steel belt with a thickness of 0.02-0.05 mm, which is spirally formed outside the optical fiber core and mainly plays a role of radial mechanical compression resistance, and the compression resistance can reach a level of 5000 N / 100 mm at most during installation and 3000 N / 100 mm at most during use, thereby avoiding the influence of the mutual extrusion of the steel wires during the production of the cable on the vibration measuring optical fiber.

[0055] A second wrapping layer 9 is arranged outside the armor layer 7, which is one or more wrapping layers wrapped outside the armor layer 7, and the thickness of the wrapping layer is generally 0.1-0.25 mm, and the overlap rate is controlled to be 10-30%. The second wrapping layer 9 can be a tape made of glass fibers or a cloth tape made of fibers.

[0056] An outer sheath layer 10, which is actually one or more plastic layers extruded outside the second wrapping layer 9. The plastic layer can be a polyvinyl chloride (PVC) material or a halogen-free low-smoke polyolefin material. The thickness of the outer sheath layer 10 is generally 1.0-4.0 mm, and the thinnest point is controlled to be the nominal thickness of the outer sheath layer 10 x 0.8 minus 0.2 mm. In the embodiment, the outer sheath layer 10 adopts a halogen-free low-smoke polyolefin material, which can realize the characteristics of halogen-free, low-smoke and flame-retardant.

[0057] The intelligent early warning cable can more accurately monitor the temperature of the cable conductor by arranging the temperature measuring element with the temperature measuring function on the outermost layer of the conductor, and can accurately detect the vibration signal and avoid deviation and influence on the accuracy of detection by arranging the vibration measuring element with the vibration measuring function in the armor layer and arranging the isolation layer between the first wrapping layer and the armor layer to isolate the electromagnetic field generated by the cable in the first wrapping layer under the condition of high voltage and large current, thereby avoiding the problem of electromagnetic field interference with the optical signal transmission in the vibration optical fiber.

[0058] The above only describes preferred embodiments of the utility model and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A smart early warning cable, characterized in that, The power line insulated wire core in the first wrapping layer comprises a conductor and an insulation layer covering the conductor, and a temperature measuring element is arranged in the conductor; an armor layer is arranged outside the first wrapping layer, and a vibration measuring element is arranged in the armor layer; an isolation layer is arranged between the first wrapping layer and the armor layer.

2. The intelligent warning cable of claim 1, wherein, The conductor is twisted by a temperature measuring element and a plurality of composite copper wires, and the temperature measuring element is located at the outermost layer of the conductor.

3. The intelligent warning cable of claim 2, wherein, The temperature measuring element is a temperature measuring optical fiber cable with temperature measuring function.

4. The intelligent warning cable of claim 3, wherein, The temperature measuring optical fiber cable comprises, from inside to outside, a multimode temperature measuring optical fiber core, a tight wrapping layer and a spiral steel belt.

5. The intelligent warning cable of claim 1, wherein, A filling layer is arranged in the region between the power line insulated wire core and the first wrapping layer in the internal space of the first wrapping layer.

6. The intelligent warning cable of claim 1, wherein, The armor layer is composed of the vibration measuring element and a single-layer steel wire wound on the isolation layer.

7. The intelligent warning cable of claim 1, wherein, The armor layer is composed of the temperature measuring element and a double-layer steel wire wound on the isolation layer, specifically, the inner layer of the double-layer steel wire is rightward wound on the isolation layer, the outer layer of the double-layer steel wire is leftward wound on the isolation layer, and the vibration measuring element is wound on the outermost layer; the sum of the gaps between each layer of steel wires does not exceed the diameter of one steel wire.

8. The intelligent warning cable of claim 1, wherein, The vibration measuring element is a vibration measuring optical fiber cable with vibration measuring function.

9. A smart warning cable as claimed in claim 8, wherein, The vibration measuring optical fiber cable comprises, from inside to outside, a single-mode optical fiber core, a tight wrapping layer and a spiral steel belt.

10. The intelligent warning cable of claim 1, wherein, A second wrapping layer is arranged outside the armor layer, and an outer sheath layer is arranged outside the second wrapping layer.

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