Temperature sensing cable

Abstract

The utility model provides a temperature sensing cable comprising a cable body, and the cable body comprises a cable conductor, an insulating layer and an insulating shielding layer which are arranged in sequence from inside to outside. The cable also comprises a first inner sheath layer, a heat dissipation layer, an armor layer and a first outer sheath layer. The plurality of temperature-sensing optical cables are arranged in the first inner sheath layer in the cable body, and the temperature change in the cable body is accurately obtained through the multimode optical fibers of the temperature-sensing optical cables, so that the temperature in the cable body is accurately detected in real time, and potential safety hazards caused by overheating of the cable body during cable faults or fire disasters are effectively avoided. Besides, heat generated by the cable conductor can be quickly transmitted and dissipated through the arrangement of the heat conduction filler and the heat dissipation layer, so that the overall heat dissipation efficiency of the cable is improved, and the temperature change in the cable is easier to monitor.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable manufacturing technical field especially is related to a temperature sensing cable. BACKGROUND

[0002] High-voltage cable has been widely used in various power facilities due to its high transmission efficiency, small line loss and other advantages. In practical application, high-voltage cable faces changing working environment such as continuous high temperature and humidity, and needs to be operated in high load state for a long time, which significantly increases the failure risk of high-voltage cable in use.

[0003] Temperature is one of the important parameters reflecting the operation state of high-voltage cable, and abnormal temperature rise is often a precursor of cable aging, overload, short circuit and external fire burning. The existing cable often lacks real-time and accurate monitoring of the internal temperature of the cable, making it extremely difficult to early warn and accurately locate the cable failure. Therefore, it is necessary to introduce temperature measurement technology to realize real-time monitoring and analysis of the internal temperature of the cable and improve the safe operation level of the power system. SUMMARY

[0004] In view of the technical problem that the cable needs to be monitored in actual application, the present utility model provides a temperature sensing cable.

[0005] A temperature sensing cable, comprising a cable body, the cable body comprises a cable conductor, an insulation layer, an insulation shielding layer, a first inner sheath layer, a heat dissipation layer, an armored layer and a first outer sheath layer arranged from inside to outside in sequence; the cable conductor comprises at least one stranded conductor; the stranded conductor is provided with a conductor shielding layer on the outside; the insulation shielding layer and the first inner sheath layer are filled with a heat-conducting filler; the first inner sheath layer is provided with a temperature sensing optical cable for detecting the internal temperature of the cable body; the temperature sensing optical cable comprises a plurality of multimode optical fibers, the outer surface of the multimode optical fiber is provided with a loose tube, a second inner sheath layer and a second outer sheath layer in sequence; the multimode optical fiber and the loose tube are filled with an ointment; the second outer sheath layer is provided with a plurality of filling ropes; the heat dissipation layer comprises a heat-conducting layer arranged on the outside of the first inner sheath layer and a heat dissipation outer layer arranged on the outside of the heat-conducting layer, and the heat dissipation outer layer is provided with a plurality of heat dissipation holes on the outer surface; the first inner sheath layer and the second inner sheath layer are both metal woven meshes; the first outer sheath layer and the second outer sheath layer are both PE sheaths.

[0006] Preferably, the stranded conductor comprises the temperature sensing optical cable and a plurality of copper wires tightly twisted around the temperature sensing optical cable.

[0007] Preferably, the heat-conducting filler is heat-conducting silica gel, and the heat-conducting silica gel is provided with a plurality of expansion holes.

[0008] Preferably, the heat-conducting layer is one of a heat-conducting silica gel layer, a metal layer or a carbon fiber layer, and the heat-conducting layer is a honeycomb structure.

[0009] Preferably, the cable conductor includes two twisted conductors, and the armored layer is provided with a plurality of temperature sensing optical cables.

[0010] Preferably, a fireproof and flame-retardant layer is arranged between the armored layer and the first outer sheath layer, and the fireproof and flame-retardant layer includes a flame-retardant layer arranged outside the armored layer and an oxygen barrier layer arranged outside the flame-retardant layer.

[0011] Preferably, the flame-retardant layer is a halogen-free low-smoke flame-retardant non-woven fabric layer, and the oxygen barrier layer is a fire clay oxygen barrier layer.

[0012] Preferably, the filling rope is a glass filling rope.

[0013] Preferably, the insulation layer is a cross-linked polyethylene insulation layer.

[0014] Preferably, the metal woven mesh is an aluminum alloy woven mesh.

[0015] The temperature sensing cable has the advantages that: the temperature sensing cable is provided, which includes a cable body, the cable body includes a cable conductor, an insulation layer, an insulation shielding layer, a first inner sheath layer, a heat dissipation layer, an armored layer and a first outer sheath layer arranged in sequence from inside to outside. A plurality of temperature sensing optical cables are arranged in the first inner sheath layer of the cable body, and the temperature change inside the cable body is accurately obtained through the multi-mode optical fiber of the temperature sensing optical cable, so that the temperature inside the cable body is detected in real time and accurately, and the safety hidden danger caused by overheating of the cable body in the case of cable failure or fire is effectively avoided. In addition, through the arrangement of the heat-conducting filler and the heat dissipation layer, the heat generated by the cable conductor can be rapidly transmitted and dissipated, so that the overall heat dissipation efficiency of the cable is improved, and the temperature change inside the cable is more easily monitored. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a structural schematic view of a temperature sensing cable according to an embodiment of the present utility model.

[0017] Figure 2 FIG. 4 is a structural schematic view of a twisted conductor according to the present utility model.

[0018] Figure 3 FIG. 6 is a structural schematic view of a twisted conductor according to an embodiment of the present utility model.

[0019] IDENTIFICATION OF DRAWINGS

[0020] 1, cable conductor; 11, stranded conductor; 111, copper wire; 12, conductor shield layer; 2, insulation layer; 3, insulation shield layer; 4, first inner sheath layer; 5, heat dissipation layer; 51, heat dissipation hole; 6, armor layer; 7, first outer sheath layer; 8, heat-conducting filler; 9, temperature sensing optical cable; 91, multi-mode optical fiber; 92, loose tube; 93, second inner sheath layer; 94, second outer sheath layer; 95, ointment; 96, filling rope; 10, fireproof flame-retardant layer. DETAILED DESCRIPTION

[0021] To further illustrate the present application, the following description will be made in conjunction with the accompanying drawings. It is particularly pointed out that the embodiments described below are only a part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0022] Embodiment 1

[0023] Reference Figure 1 As shown in the figure, a temperature sensing cable, comprising a cable body, the cable body comprises a cable conductor 1, an insulation layer 2, an insulation shield layer 3, a first inner sheath layer 4, a heat dissipation layer 5, an armor layer 6 and a first outer sheath layer 7 arranged from inside to outside.

[0024] Specifically, the cable conductor 1 includes at least one stranded conductor 11; in this embodiment, the cable conductor 1 includes a stranded conductor 11.

[0025] The stranded conductor 11 is provided with a conductor shield layer 12 outside. The conductor shield layer 12 is used to balance the electric field and prevent partial discharge.

[0026] The insulation layer 2 is used for electrical insulation; in this embodiment, the insulation layer 2 is a cross-linked polyethylene insulation layer.

[0027] The insulation shield layer 3 is used to balance the electric field and prevent partial discharge. The insulation shield layer 3 is formed by extruding the insulation shield material on the outer surface of the insulation layer 2. The insulation shield layer 3 and the first inner sheath layer 4 are filled with heat-conducting filler 8; the heat-conducting filler 8 is heat-conducting silica gel, and the heat-conducting silica gel is provided with a plurality of expansion holes (not shown in the figure). The heat-conducting silica gel is a kind of silicon-based material with high heat-conducting performance, which has excellent heat-conducting performance, can expand the heat-conducting area by setting the expansion hole, rapidly transfer the heat generated by the cable conductor 1, thereby improving the overall heat dissipation efficiency of the cable; also makes the temperature change inside the cable more easily monitored.

[0028] The first inner sheath layer 4 is provided with a temperature sensing optical cable 9 for detecting the temperature inside the cable body. In this embodiment, two temperature sensing optical cables 9 are provided in the first inner sheath layer 4, which are symmetrically arranged inside the two sides of the first inner sheath layer 4. The stranded conductor 11 includes the temperature sensing optical cable 9 and a plurality of copper wires 111 tightly stranded outside the temperature sensing optical cable 9. Through the arrangement of three temperature sensing optical cables 9, the temperatures of the center and two points on both sides of the first inner sheath layer 4 can be obtained, and the temperature inside the cable body can be more accurately judged.

[0029] As shown in the reference Figure 2 The temperature sensing optical cable 9 includes a plurality of multimode optical fibers 91, and the outer surface of the multimode optical fiber 91 is sequentially provided with a loose tube 92, a second inner sheath layer 93 and a second outer sheath layer 94. The multimode optical fiber 91 and the loose tube 92 are filled with ointment 95. By arranging the loose tube, the second inner sheath layer 93 and the second outer sheath layer 94, the multimode optical fiber 91 is protected, and the tensile, compressive and lateral pressure resistance of the optical cable is enhanced, so that the optical cable can maintain stable working state in harsh environment. The ointment 95 filled between the multimode optical fiber 91 and the loose tube not only plays a lubricating role, but also helps to evenly distribute the internal temperature of the optical cable, thereby improving the accuracy of temperature measurement.

[0030] The temperature acquisition step of the temperature sensing optical cable 9 is: the stranded conductor 11 of the cable generates heat when working, so that the temperature in the cable body rises. The heat-conducting filler 8 fully conducts heat to the first inner sheath layer 4. When the temperature is transmitted to the temperature sensing optical cable 9 in the first inner sheath layer 4, the light pulse propagates in the multimode optical fiber 91 and interacts with the optical fiber molecules to produce Raman scattering. Raman scattering propagates along the optical fiber and is reflected back to the optical fiber sensor connected to one end of the temperature sensing optical cable 9 in the cable body. The optical fiber sensor sends the returned signal to a signal processing module. Then, the ratio of anti-Stokes to Stokes light intensity in Raman scattering theory is used to realize the measurement of the temperature in the cable body, and the light time domain reflection principle can be used to realize positioning.

[0031] The temperature change inside the cable body is accurately obtained through the multimode optical fiber 91 of the temperature sensing optical cable 9, so as to realize real-time and accurate detection of the temperature inside the cable body, effectively avoid the safety hidden danger caused by the overheating of the cable body due to the failure or fire caused by aging, short circuit and the like of the cable, and improve the safety of the cable use.

[0032] The second outer sheath layer 94 is provided with a plurality of filling ropes 96. The filling ropes 96 provide additional support and strength for the temperature sensing optical cable 9, and help prevent the temperature sensing optical cable 9 from deforming or being damaged when the cable is bent or stretched. In this embodiment, the filling ropes 96 are glass filling ropes made of glass fiber. The first inner sheath layer 4 and the second inner sheath layer 93 are both metal woven meshes; the metal woven meshes can eliminate the interference of external electromagnetic fields of the cable, and at the same time play a grounding protection role. Preferably, the metal woven mesh is an aluminum alloy woven mesh. The first outer sheath layer 7 and the second outer sheath layer 94 are both PE sheaths.

[0033] The heat dissipation layer 5 includes a heat conducting layer arranged outside the first inner sheath layer 4 and a heat dissipation outer layer arranged outside the heat conducting layer, and the outer surface of the heat dissipation outer layer is provided with a plurality of heat dissipation holes 51. In this embodiment, the heat conducting layer is one of a heat conducting silica gel layer, a metal layer or a carbon fiber layer, and the heat conducting layer is a honeycomb structure.

[0034] The heat conducting layer acts as a bridge for heat transfer, and can quickly conduct the heat generated inside the cable out. The honeycomb structure of the heat conducting layer increases the surface area of heat conduction, so that the heat can be more evenly dissipated from the heat conducting layer to the heat dissipation outer layer, and then dissipated from the heat dissipation outer layer. The arrangement of the heat dissipation holes 51 further improves the heat dissipation efficiency of the heat dissipation outer layer.

[0035] Preferably, a fireproof flame-retardant layer 10 is arranged between the armor layer 6 and the first outer sheath layer 7; the fireproof flame-retardant layer 10 includes a flame-retardant layer arranged outside the armor layer 7 and an oxygen barrier layer arranged outside the flame-retardant layer. In this embodiment, the flame-retardant layer is a halogen-free low-smoke flame-retardant non-woven fabric layer; the oxygen barrier layer is a fireproof mud oxygen barrier layer.

[0036] Embodiment 2

[0037] Reference Figure 3 As shown, the difference between embodiment 2 and embodiment 1 is that the cable conductor 1 includes two twisted conductors 11; the armor layer 7 is provided with a plurality of temperature sensing optical cables 9. In this embodiment, the armor layer 7 is provided with two temperature sensing optical cables 9 symmetrically arranged inside the two sides of the armor layer 7. By arranging five temperature sensing optical cables 9, the temperature of the center of the cable body, the inside of the cable body and the outside of the cable body can be obtained from the inside to the outside, so that the temperature inside the cable body can be more accurately judged. The temperature obtained by the temperature sensing optical cable 9 in the armor layer 7 and the temperature obtained by the temperature sensing optical cable 9 of the first inner sheath layer 4 can be used to judge the heat dissipation effect of the heat dissipation layer 5.

[0038] The preferred embodiments of the utility model disclosed above are only used for helping to set forth the utility model, and do not limit the utility model to be only the specific implementation manner described. Apparently, according to the content of the description, other modifications and changes can be made. The embodiments selected and specifically described in the description are for better explaining the principle and practical application of the utility model, so that the person skilled in the art can well understand and utilize the utility model, and are not a limitation on the utility model, and any scheme of simple transformation of the utility model belongs to the protection scope of the utility model.

Claims

1. A temperature sensing cable, characterized by, The cable body comprises a cable conductor, an insulation layer, an insulation shielding layer, a first inner sheath layer, a heat dissipation layer, an armor layer and a first outer sheath layer arranged from inside to outside in sequence. The cable conductor comprises at least one stranded conductor, and the stranded conductor is provided with a conductor shielding layer outside. The first inner sheath layer is provided with a temperature sensing optical cable for detecting the internal temperature of the cable body. The temperature sensing optical cable comprises a plurality of multimode optical fibers, and the outer surface of the multimode optical fiber is provided with a loose tube, a second inner sheath layer and a second outer sheath layer in sequence. The heat dissipation layer comprises a heat conduction layer arranged outside the first inner sheath layer and a heat dissipation outer layer arranged outside the heat conduction layer, and the heat dissipation outer layer is provided with a plurality of heat dissipation holes on the outer surface. The first inner sheath layer and the second inner sheath layer are both metal woven meshes, and the first outer sheath layer and the second outer sheath layer are both PE sheaths.

2. A temperature sensing cable according to claim 1, characterised in that, The stranded conductor comprises the temperature sensing optical cable and a plurality of copper wires tightly twisted around the temperature sensing optical cable.

3. A temperature sensing cable according to claim 1, wherein The heat conductive filler is heat conductive silica gel, and a plurality of expansion holes are arranged on the heat conductive silica gel.

4. A temperature sensing cable according to claim 1, wherein The heat conduction layer is one of a heat conductive silica gel layer, a metal layer or a carbon fiber layer, and the heat conduction layer is a honeycomb structure.

5. A temperature sensing cable according to claim 1, wherein The cable conductor comprises two stranded conductors, and the armor layer is provided with a plurality of temperature sensing optical cables.

6. A temperature sensing cable according to claim 1, wherein The armor layer and the first outer sheath layer are provided with a fireproof and flame-retardant layer, and the fireproof and flame-retardant layer comprises a flame-retardant layer arranged outside the armor layer and an oxygen barrier layer arranged outside the flame-retardant layer.

7. A thermal cable according to claim 6, characterised in that The flame-retardant layer is a halogen-free low-smoke flame-retardant non-woven fabric layer, and the oxygen barrier layer is a fire clay oxygen barrier layer.

8. A temperature sensing cable according to claim 1, wherein, The filling rope is a glass filling rope.

9. A temperature sensing cable according to claim 1, wherein, The insulation layer is a cross-linked polyethylene insulation layer.

10. A temperature sensing cable according to claim 1, wherein, The metal woven mesh is an aluminum alloy woven mesh.

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