Composite material low-voltage cable with temperature self-sensing capability

Abstract

The utility model discloses a composite material low-voltage cable with temperature self-sensing capability, which belongs to the technical field of cables and comprises a wiring pipe made of fiber reinforced resin composite materials. The fiber reinforced resin composite material is formed by alternately arranging fiber layers along the length direction of the wiring pipe and fiber layers along the circumferential direction of the wiring pipe and brushing epoxy resin, and a temperature sensing optical fiber cable is arranged between the fiber layers; four insulating wire cores are arranged in the wiring pipe, a temperature-sensing optical fiber cable is arranged among the insulating wire cores, and fire clay fillers are filled in gaps among the wiring pipe, the insulating wire cores and the temperature-sensing optical fiber cable. Compared with the traditional wiring pipe, the fiber reinforced resin composite material wiring pipe has the advantages of high temperature resistance, light weight, high strength and corrosion resistance; and meanwhile, the temperature change of the cable can be monitored in real time through the temperature sensing optical fiber cables arranged in the pipe wall of the wiring pipe and among the four insulating wire cores.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cable technical field, concretely relates to a composite material low -voltage cable with temperature self -perception ability. BACKGROUND

[0002] The power cable fire has been a big hidden trouble of fire safety in construction engineering, and the power cable usually generates high temperature before fire, so real -time temperature monitoring of the power cable is the necessary means of power cable fire early warning.

[0003] The existing patent CN202120692088.3 discloses a fire -resistant optical fiber temperature measurement cable, including insulated core, fire -resistant mud filling layer, optical fiber temperature measurement unit outside the insulated core and armored outer sheath, can give consideration to the sensitivity of temperature detection and the fire resistance of optical fiber.

[0004] But the above -mentioned scheme still has defects, and the optical fiber temperature measurement unit is arranged outside the core, and the temperature rise caused by the cable outside or the internal short circuit cannot be distinguished;The cable outer sheath is a traditional metal armor layer, which is heavy, and requires high fixing device during laying, and is easy to be corroded. SUMMARY

[0005] To solve the above -mentioned defects, the utility model discloses a composite material low -voltage cable with temperature self -perception ability, aims at reducing the cable dead weight under the premise of not reducing the cable strength, and can distinguish whether the abnormal high temperature originates from the cable inside or outside.

[0006] The technical scheme of the utility model is as follows:

[0007] The utility model provides a composite material low -voltage cable with temperature self -perception ability, including wiring pipe, four insulated cores, temperature sensing optical fiber cable and fire -resistant mud filling.

[0008] Preferably, the wiring pipe is made of fiber reinforced resin composite material, and the fiber reinforced resin composite material is made of fiber layers along the length direction of the wiring pipe and fiber layers along the circumferential direction of the wiring pipe, which are alternately arranged and coated with epoxy resin.

[0009] Preferably, the insulated core includes a conductor and an insulating layer, the insulating layer is made of ethylene propylene rubber material, and the four insulated cores are arranged in a square.

[0010] Preferably, the temperature sensing optical fiber cable includes an armored sheath and a temperature sensing optical fiber, and the temperature sensing optical fiber is located in the armored sheath without mutual adhesion.

[0011] Preferably, four temperature sensing optical fiber cables are arranged between the fiber layers of the wiring pipe wall along the length direction of the cable, and each temperature sensing optical fiber cable is spaced 90 degrees from each other.

[0012] Preferably, one of the temperature sensing optical fiber cables is arranged in the middle of the four insulated cores.

[0013] Preferably, each of the temperature sensing optical fiber cables is arranged from the front end to the rear end of the cable, and connected end to end to form a through optical fiber.

[0014] Preferably, the gap between the wiring tube and the insulated core is filled with refractory mortar material.

[0015] The temperature sensing optical fiber cable is connected with a Raman optical time domain reflectometer through a signal transmission optical fiber, and the Raman optical time domain reflectometer can monitor the temperature change of the temperature sensing optical fiber cable along the line in real time.

[0016] Advantages

[0017] The composite low-voltage cable with temperature self-sensing capability has the advantages that:

[0018] (1) The cable uses a fiber reinforced resin composite wiring tube, which greatly reduces the self weight of the cable without reducing the tensile strength of the cable, and is resistant to high temperature and corrosion.

[0019] (2) The temperature sensing optical fiber cable arranged in the wiring tube wall and the center of the four insulated cores can monitor the temperature change of the cable along the line in real time, and distinguish whether the abnormally high temperature comes from the inside or outside of the cable. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a three-dimensional structure schematic diagram of a composite low-voltage cable with temperature self-sensing capability provided by the specific embodiment of the utility model;

[0021] Figure 2 is a cross-sectional schematic diagram of a composite low-voltage cable with temperature self-sensing capability provided by the specific embodiment of the utility model;

[0022] Figure 3 is an enlarged structure schematic diagram of the A part in the specific embodiment provided by the utility model; Figure 2

[0023] In the figure: 1-wiring tube; 11-fiber layer along the circumferential direction of the wiring tube; 12-fiber layer along the length direction of the wiring tube; 13-epoxy resin; 2-insulated core; 21-conductor; 22-ethylene propylene rubber insulation layer; 3-temperature sensing optical fiber cable; 31-armor sheath; 32-temperature sensing optical fiber; 4-refractory mortar filler. DETAILED DESCRIPTION

[0024] ​The embodiments of the present application will be described below in conjunction with the drawings and examples. Obviously, the examples are only used to specifically introduce the technical solutions of the present application, but not limit the scope of protection of the present application.

[0025] Embodiment

[0026] Reference Figure 1 As shown in the figure, a composite material low-voltage cable with temperature self-sensing capability comprises a wiring tube 1, insulated cores 2, temperature sensing optical fiber cables 3 and fire clay fillers 4.

[0027] Reference Figure 2 As shown in the figure, the four insulated cores 2 in the wiring tube 1 are arranged in a square, and the insulated core 2 comprises a conductor 21 and an ethylene-propylene rubber insulation layer 22. The ethylene-propylene rubber material has a long-term allowable working temperature of 90 degrees and a short-circuit thermal stability allowable temperature of 250 degrees, and is suitable for large temperature cycles, and has good cold resistance and high temperature resistance.

[0028] Reference Figure 2 As shown in the figure, the four temperature sensing optical fiber cables 3 are arranged at an interval of 90 degrees in the wall of the wiring tube 1, and one temperature sensing optical fiber cable 3 is arranged in the middle of the arrangement of the four insulated cores 2. Each temperature sensing optical fiber cable 3 is arranged longitudinally from the front end to the rear end of the cable, and is connected at the head and tail to form a longitudinal optical fiber. The longitudinal optical fiber is connected with a Raman optical time domain reflectometer through a signal transmission optical fiber, and the temperature change of the temperature sensing optical fiber cable along the line is monitored in real time. When a fire occurs outside the cable or a short circuit fault occurs in the internal core of the cable, the temperature at the position will rise, which will be monitored by the temperature sensing optical fiber. If the temperature monitored by the temperature sensing optical fiber cable arranged in the middle of the arrangement of the four insulated cores 2 is higher than that monitored by the temperature sensing optical fiber cable arranged in the wall of the wiring tube 1, it indicates that a short circuit may occur in the internal core of the cable, and the circuit of the cable at the position should be disconnected and the cable line should be repaired. If the temperature monitored by the temperature sensing optical fiber cable arranged in the middle of the arrangement of the four insulated cores 2 is lower than that monitored by the temperature sensing optical fiber cable arranged in the wall of the wiring tube 1, it indicates that a fire may occur outside the cable, and the circuit of the cable at the position should be disconnected, and a person should be sent to check whether a fire occurs around the position of the cable.

[0029] Reference Figure 2 As shown in the figure, the gap between the wiring tube 1 and the insulated core 2 is filled with fire clay fillers 4, which can effectively delay the burning of the cable by external flames, expand the fire, or prevent external fires when a short circuit occurs in the internal core.

[0030] Reference Figure 3 As shown in the figure, the wiring tube 1 is made of fiber reinforced resin composite material, specifically: the fiber layers 11 along the circumferential direction of the wiring tube and the fiber layers 12 along the length direction of the wiring tube are arranged alternately, and epoxy resin 13 is brushed between each layer of fiber layers. The wiring tube 1 greatly reduces the self-weight of the cable without reducing the tensile strength of the cable, and is resistant to high temperature and corrosion.

[0031] Reference Figure 3 As shown, the temperature sensing optical fiber cable 3 is disposed between the fiber layer 11 and the fiber layer 12 and is integrated with the wiring tube 1 by brushing epoxy resin 13. The temperature sensing optical fiber cable 3 includes an armored sheath 31 and a temperature sensing optical fiber 32, the temperature sensing optical fiber 32 is located in the armored sheath 31, and the two are not bonded with each other. The armored sheath 31 can protect the temperature sensing optical fiber 32 from being damaged by external force. There is no connection between the armored sheath 31 and the temperature sensing optical fiber 32, so the temperature sensing optical fiber 32 is only affected by temperature, eliminating the influence of optical fiber deformation on the temperature measurement accuracy of the temperature sensing optical fiber 32.

[0032] The above is only the preferred embodiment of the present application, not the limitation of the protection scope of the present application, any equivalent replacement improvement made on the basis of the technical scheme claimed in the claims of the present application should be included in the protection scope of the present application.

Claims

1. A composite low voltage cable with temperature self-awareness, characterized in that, The cable includes a wiring tube (1), insulated cores (2), temperature sensing fiber optic cables (3) and fireclay filler (4), the insulated cores (2) include conductors (21) and ethylene-propylene rubber insulation layers (22), four insulated cores (2) are arranged in a square in the wiring tube (1), four temperature sensing fiber optic cables (3) are arranged at 90 degrees apart in the wall of the wiring tube (1), one temperature sensing fiber optic cable (3) is arranged in the middle of the four insulated cores (2), each temperature sensing fiber optic cable (3) is arranged from the front end to the rear end of the cable, and the front end and the rear end are connected, forming a through optical fiber, the gap between the wiring tube (1) and the insulated core (2) is filled with fireclay filler (4).

2. A composite low voltage cable with temperature self-aware capability according to claim 1, characterized in that, The wiring tube (1) is made of fiber reinforced resin composite material, the fiber layers (11) along the circumference direction of the wiring tube and the fiber layers (12) along the length direction of the wiring tube are alternately arranged, and the epoxy resin (13) is brushed between each layer of fiber layers.

3. The composite low voltage cable with temperature self-aware capability according to claim 1, wherein, The temperature sensing fiber optic cable (3) includes an armored sheath (31) and a temperature sensing fiber (32), the temperature sensing fiber (32) is located in the armored sheath (31), and the temperature sensing fiber (32) and the armored sheath (31) are not bonded to each other.

4. A composite low voltage cable with temperature self-aware capability according to claim 3, characterized in that, The temperature sensing fiber optic cable (3) is connected with a Raman light time domain reflectometer through a signal transmission optical fiber, and the Raman light time domain reflectometer monitors the temperature change of the temperature sensing fiber optic cable along the line in real time.

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