Oil leakage detection cable and its application in oil leakage detection

Abstract

Provided are an oil leakage detection cable and its application in oil leakage detection. The oil leakage detection cable is suitable for oil leakage detection, and a conductive polymer layer can absorb liquid oil and expand. The end of a first conductive core wire is electrically connected to a first conductor, and the end of a second conductive core wire is electrically connected to a second conductor, or the end of the first conductive core wire is electrically connected to the second conductor, and the end of the second conductive core wire is electrically connected to the first conductor. Before the conductive polymer layer absorbs liquid oil and expands, the first conductor and the second conductor are radially spaced apart from the conductive polymer layer. When liquid oil is immersed in the inside of a porous insulating sheath through the porous insulating sheath and contacts the conductive polymer layer, the conductive polymer layer absorbs the liquid oil and expands, and then the expanded conductive polymer layer contacts the first conductor and the second conductor, so that the expanded conductive polymer layer, the first conductor, the second conductor, the first conductive core wire and the second conductive core wire form a conductive path.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of oil product leakage detection, and more particularly to an oil product leakage detection cable and its application in oil product leakage detection. BACKGROUND

[0002] Figure 1 is a schematic diagram of an existing oil product storage tank. Figure 2 is a schematic diagram of a known oil product storage tank bottom leakage detection.

[0003] Currently, the tank bottom B leakage detection of the oil product storage tank 2000 generally adopts the method of setting a liquid guide pipe 3000 below the tank bottom B, as shown in Figure 2 Four liquid guide pipes 3000 are arranged at 90-degree intervals below the periphery of the tank bottom B, and each liquid guide pipe 3000 is used to collect oil product flowing from a leakage point of the tank bottom B to the periphery of the tank bottom B. Once the liquid guide pipe 3000 leaks (i.e., oil has been collected in the liquid guide pipe 3000 and flows out through the liquid guide pipe 3000), it can be determined that the tank bottom B has leaked.

[0004] This method can only determine that the tank bottom B has leaked, cannot locate the leakage point, cannot find a small leak, and can only be found when a large amount of leakage occurs. Because Figure 1As shown, the periphery of the tank bottom B of the existing oil storage tank 2000 is low and the center is slightly high, so that the tank bottom B of the oil storage tank 2000 is in a shape of upward bulging, with the inner surface upward convex and the outer surface upward concave, so that the tank bottom B and the cylinder T form a complete groove G at the periphery of the tank bottom B, which is used to collect water or sand mixed in the oil in the oil storage tank 2000, so as to be discharged through the hole (not shown) provided at the groove G which can be opened. When the tank bottom B leaks at a position other than the periphery, the leak usually evolves from a small micro-leak formed by a tiny corrosion hole into a large leak of a large hole. The small micro-leak cannot be collected by the drain pipe 3000 because the small micro-leak will first form droplets due to the effect of liquid surface tension and directly drip down. Even if it is attached and distributed all over the outer surface of the tank bottom B due to capillary action, it is difficult to reach the periphery of the tank bottom B due to the travel distance. If the drain pipe 3000 collects the leaking oil, it means that a large amount of leakage has occurred at this time (at the same time, a large amount of oil directly gravitates from the tank bottom B). When a large amount of leakage occurs, although the four drain pipes 3000 are distributed at the periphery of the tank bottom B at an interval of 90 degrees, and a certain drain pipe 3000 has collected the leaking oil and appears to be leaking, it can only be determined that the tank bottom B is leaking. In other words, it is not possible to further determine which part / region of the tank bottom B is leaking, because the flow from the center of the upward concave outer surface of the tank bottom B to the periphery is arbitrary gravitational flow. At this time, a large amount of oil has actually been lost (i.e. the leaking oil of the tank bottom B directly drips onto the soil below the tank bottom B), which has an impact on the soil environment.

[0005] Based on the above reasons, further improvements are needed in oil leakage detection. SUMMARY

[0006] In view of the problems in the background art, the purpose of the present disclosure is to provide an oil leakage detection cable and its application in oil leakage detection, which can be applied to oil leakage detection and at least early detection of leakage.

[0007] Thus, in some embodiments, there is provided an oil leakage detection cable, the oil leakage detection cable is suitable for oil leakage detection; the oil leakage detection cable comprises a porous insulating sheath, a conductive polymer layer, a central insulator, a first external wire, a second external wire, a first peripheral insulator, a second peripheral insulator, a first conductor and a second conductor arranged along the entire length of the oil leakage detection cable; the porous insulating sheath can enable the leaked liquid oil to penetrate from the outside of the oil leakage detection cable to the inside of the porous insulating sheath through the pores of the porous insulating sheath; the conductive polymer layer is tubularly arranged on the inside of the porous insulating sheath, and the conductive polymer layer can absorb the hydrocarbon expansion of the liquid oil; the central insulator is located in the center of the conductive polymer layer; the first external wire, the first peripheral insulator, the first conductor, the second external wire, the second peripheral insulator and the second conductor are sequentially arranged around the central insulator and fixed together in the conductive polymer layer, and the first external wire and the second conductor are adjacent in the circumferential direction; the first external wire comprises a first insulating layer and a first conductive core wire, and the first conductive core wire is wrapped in the first insulating layer; the second external wire comprises a second insulating layer and a second conductive core wire, and the second conductive core wire is wrapped in the second insulating layer; the end of the first conductive core wire is electrically connected to the first conductor, and the end of the second conductive core wire is electrically connected to the second conductor, or the end of the first conductive core wire is electrically connected to the second conductor, and the end of the second conductive core wire is electrically connected to the first conductor; before the conductive polymer layer absorbs the hydrocarbon expansion of the liquid oil, the first conductor and the second conductor are radially spaced apart from the conductive polymer layer, when the liquid oil is immersed in the inside of the porous insulating sheath through the porous insulating sheath and contacts the conductive polymer layer, the conductive polymer layer absorbs the hydrocarbon of the liquid oil and expands, and then the expanded conductive polymer layer contacts the first conductor and the second conductor, so that the expanded conductive polymer layer, the first conductor, the second conductor, the first conductive core wire of the first external wire and the second conductive core wire of the second external wire form an electrically conductive path.

[0008] In some embodiments, the porous insulating sheath is a woven insulating material.

[0009] In some embodiments, the woven insulating material is a fluorine-containing fiber woven fabric.

[0010] In some embodiments, the conductive polymer layer is an oil-swelling conductive rubber.

[0011] In some embodiments, the oil-swelling conductive rubber is a one-piece and comprises a rubber matrix, an oleophilic functional group or oleophilic component, and a conductive agent.

[0012] In some embodiments, the oil-swelling conductive rubber comprises a tubular oil-swelling rubber and a conductive layer arranged on the inner circumferential surface of the tubular oil-swelling rubber.

[0013] In some embodiments, the center insulator, the first outer connecting wire, the second outer connecting wire, the first peripheral insulator, the second peripheral insulator, the first conductor and the second conductor are twisted together.

[0014] In some embodiments, the diameters of the first conductor and the second conductor are smaller than the diameters of the center insulator, the first outer connecting wire, the second outer connecting wire, the first peripheral insulator and the second peripheral insulator.

[0015] In some embodiments, the first outer connecting wire and the second outer connecting wire are respectively located on two sides of the center insulator in the radial direction; the first peripheral insulator and the second peripheral insulator are respectively located on two sides of the center insulator in the radial direction; and the first conductor and the second conductor are respectively located on two sides of the center insulator in the radial direction.

[0016] In some embodiments, the present disclosure provides an application of the aforementioned oil leakage detection cable in oil leakage detection, wherein the oil leakage detection cable is arranged below an object to be detected for storing oil, and the oil leakage point is detected by monitoring the resistance between the first conductor, the second conductor, the first outer connecting wire and the second outer connecting wire.

[0017] The present disclosure has the following beneficial effects: when the oil leakage detection cable is arranged below an object to be detected for storing oil, the oil leakage point is detected by monitoring the resistance between the first conductor, the second conductor, the first outer connecting wire and the second outer connecting wire, at this time, the leaked oil at the leakage point forms oil droplets that drop by gravity, and thus the leaked oil penetrates into the inside of the porous insulating skin from the outside of the oil leakage detection cable through the holes of the porous insulating skin, the conductive polymer layer absorbs the hydrocarbons of the liquid oil and expands, and then the expanded conductive polymer layer contacts the first conductor and the second conductor, so that the expanded conductive polymer layer, the first conductor, the second conductor, the first conductive core wire of the first outer connecting wire and the second conductive core wire of the second outer connecting wire form a path for electrical conduction, and due to the formation of the path for electrical conduction, the resistance between the first conductor, the second conductor, the first outer connecting wire and the second outer connecting wire will change, at this time, the change in resistance can be detected by a corresponding on-line resistance tester, in this way, the leakage of oil can be detected as early as possible, and thus the technical personnel can find the specific cause of the leakage as early as possible and take corresponding measures, so as to greatly reduce the damage degree of the object to be detected for storing oil and the corresponding derived production cost, and also reduce the severity of soil pollution. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of an existing oil storage tank.

[0019] Figure 2 is a top view schematic diagram of a known oil storage tank bottom leakage detection.

[0020] Figure 3is a perspective view of an oil product leakage detection cable according to the present disclosure.

[0021] Figure 4 is Figure 3 a cross-sectional view of the oil product leakage detection cable.

[0022] Figure 5 is Figure 3 a schematic view of the oil product leakage detection cable after the conductive polymer layer absorbs and expands due to oil.

[0023] Figure 6 is a schematic view of an oil tank bottom leakage detection system according to the present disclosure.

[0024] Figure 7 is a schematic view of a plastic tube of an oil tank bottom leakage detection system according to the present disclosure.

[0025] Wherein, the reference signs are explained as follows:

[0026] 1000 oil tank bottom leakage detection system 8 first conductor

[0027] 100 oil product leakage detection cable 9 second conductor

[0028] 1 porous insulation skin 200 online resistance tester

[0029] 2 conductive polymer layer 300 HMI

[0030] 3 central insulator 400 plastic tube

[0031] 4 first external wire 400a through hole

[0032] 41 first insulating layer 400b central horizontal plane

[0033] 42 first conductive core wire 500 insulating cap

[0034] 5 second external wire 2000 oil tank

[0035] 51 second insulating layer B tank bottom

[0036] 52 second conductive core wire T cylinder

[0037] 6 first peripheral insulator G groove

[0038] 7 second peripheral insulator 3000 liquid guide pipe DETAILED DESCRIPTION

[0039] The accompanying drawings illustrate embodiments of the present disclosure and it is to be understood that the disclosed embodiments are merely examples of the present disclosure and the present disclosure can be embodied in various forms, therefore, the specific details disclosed herein should not be interpreted as limiting but merely as a basis for the claims and as a representative basis for teaching one of ordinary skill in the art to variously embody the present disclosure in various forms.

[0040] [Oil leakage detection cable]

[0041] Referring to Figures 3 to 5 The oil leakage detection cable 100 is suitable for oil leakage detection, and the oil leakage detection cable 100 comprises a porous insulation sheath 1, a conductive polymer layer 2, a central insulator 3, a first outer lead 4, a second outer lead 5, a first peripheral insulator 6, a second peripheral insulator 7, a first conductor 8 and a second conductor 9 arranged along the whole length of the oil leakage detection cable 100.

[0042] The porous insulation sheath 1 enables the leaked liquid oil to penetrate from the outside of the oil leakage detection cable 100 to the inside of the porous insulation sheath 1 through the pores of the porous insulation sheath 1. The conductive polymer layer 2 is tubularly arranged inside the porous insulation sheath 1, and the conductive polymer layer 2 is capable of absorbing the hydrocarbon expansion of the liquid oil. The central insulator 3 is located in the center of the conductive polymer layer 2. The first outer lead 4, the first peripheral insulator 6, the first conductor 8, the second outer lead 5, the second peripheral insulator 7 and the second conductor 9 are sequentially arranged around the central insulator 3 in the circumferential direction and fixed together, and the first outer lead 4 and the second conductor 9 are adjacent in the circumferential direction. The first outer lead 4 comprises a first insulation layer 41 and a first conductive core wire 42, and the first conductive core wire 42 is wrapped in the first insulation layer 41. The second outer lead 5 comprises a second insulation layer 51 and a second conductive core wire 52, and the second conductive core wire 52 is wrapped in the second insulation layer 51. The end of the first conductive core wire 42 is electrically connected to the first conductor 8, and the end of the second conductive core wire 52 is electrically connected to the second conductor 9, or the end of the first conductive core wire 42 is electrically connected to the second conductor 9, and the end of the second conductive core wire 52 is electrically connected to the first conductor 8. Before the conductive polymer layer 2 absorbs the hydrocarbon expansion of the liquid oil, the first conductor 8 and the second conductor 9 are radially spaced apart from the conductive polymer layer 2. When the liquid oil penetrates to the inside of the porous insulation sheath 1 through the porous insulation sheath 1 and contacts the conductive polymer layer 2, the conductive polymer layer 2 absorbs the hydrocarbon of the liquid oil and expands, and then the expanded conductive polymer layer 2 contacts the first conductor 8 and the second conductor 9, so that the expanded conductive polymer layer 2, the first conductor 8, the second conductor 9, the first conductive core wire 42 of the first outer lead 4 and the second conductive core wire 52 of the second outer lead 5 form an electrically conductive path.

[0043] In the oil leak detection cable 100 disclosed herein, when the oil leak detection cable 100 is installed on the object storing the oil to be detected (e.g., an oil pipeline or an oil storage tank), for an oil pipeline, several oil leak detection cables 100 can be arranged across the entire length of the oil pipeline, or several oil leak detection cables 100 can be installed in sections along the entire length of the oil pipeline. For an oil storage tank, a... Figure 6 Below the arrangement of the cable (as described below), the oil leak point is detected by monitoring the resistance between the first conductor 8, the second conductor 9, the first external connection 4, and the second external connection 5. At this point, the leaking oil forms droplets that drip down due to gravity. These droplets can either drip directly onto the porous insulating layer 1 or reach the porous insulating layer 1 through the through-hole 400a on the plastic tube 400 (described later). Thus, the leaked oil seeps from the outside of the oil leak detection cable 100 into the inside of the porous insulating layer 1 through the holes. The conductive polymer layer 2 absorbs the hydrocarbons of the liquid oil and expands. The expanded conductive polymer layer 2 then contacts the first conductor 8 and the second conductor 9, thereby expanding the conductive polymer layer... The composite layer 2, the first conductor 8, the second conductor 9, the first conductive core wire 42 of the first external connection 4, and the second conductive core wire 52 of the second external connection 5 form an electrically conductive path. Due to the formation of an electrically conductive path, the resistance between the first conductor 8, the second conductor 9, the first external connection 4, and the second external connection 5 will change. At this time, the change in resistance can be detected by a corresponding online resistance tester 300, such as the one described later. In this way, oil leaks can be detected as early as possible, which allows technicians to find the specific cause of the leak as early as possible and take corresponding measures to greatly reduce the damage to the stored oil and the corresponding production costs. In addition, it also reduces the severity of soil pollution.

[0044] For ease of manufacturing and permeability, the porous insulation 1 can be a braided insulation. Braided insulation is a very mature technology in the cable industry, possessing high flexibility and impact resistance. Furthermore, the braided insulation is a fluorinated fiber braid to increase the working durability, weather resistance, and corrosion resistance of the porous insulation 1. The fluorinated fiber can be, but is not limited to, fluorinated polyester fiber, polytetrafluoroethylene fiber, tetrafluoroethylene and hexafluoropropylene copolymer fiber, polyvinylidene fluoride fiber, ethylene-trifluorochloroethylene copolymer fiber, etc.

[0045] The conductive polymer layer 2 can be an oil-swollen conductive rubber. Specifically, the oil-swollen conductive rubber is an integral single piece and includes a rubber matrix, an oleophilic functional group or oleophilic component, and a conductive agent, i.e., the conductive agent is added on the components of the oil-swollen rubber. In an alternative embodiment, the oil-swollen conductive rubber includes an oil-swollen rubber in a tubular shape and a conductive layer provided on the inner circumferential surface of the tubular oil-swollen rubber. Regardless of which way is adopted, the oil-swollen rubber or even the integral single piece of the oil-swollen conductive rubber itself is a relatively mature product, for example, see: Gao Bin, Jin Chao, Research Progress of Oil Swollen Rubber, Equipment Manufacturing Technology, 2014, No. 1, pp. 278-280; Guan Jian et al., Preparation and Performance Research of SBR Swollen Rubber, Colloid and Polymer, December 2013, Vol. 31, No. 4, pp. 158-160; Li Xueyu et al., Research Progress of Conductive Rubber Composites, Synthetic Rubber Industry, Vol. 45, No. 4, pp. 331-335. The conductive agent and the conductive layer can both be carbon black, graphite, metal, etc.

[0046] As shown in Figure 3 , the central insulator 3, the first external wire 4, the second external wire 5, the first peripheral insulator 6, the second peripheral insulator 7, the first conductor 8, and the second conductor 9 are twisted together. In this way, the structural stability of the central insulator 3, the first external wire 4, the second external wire 5, the first peripheral insulator 6, the second peripheral insulator 7, the first conductor 8, and the second conductor 9 as a whole is increased, and at the same time, the path formed by the oil-swollen conductive polymer layer 2, the first conductor 8, the second conductor 9, the first conductive core wire 42 of the first external wire 4, and the second conductive core wire 52 of the second external wire 5 for electrical conduction can be achieved at any point where oil leakage is received on the full length of the oil product leakage detection cable 100.

[0047] As shown in Figures 3 to 5 , the diameters of the first conductor 8 and the second conductor 9 are smaller than the diameters of the central insulator 3, the first external wire 4, the second external wire 5, the first peripheral insulator 6, and the second peripheral insulator 7, so that the first conductor 8 and the second conductor 9 are radially spaced apart from the conductive polymer layer 2 before the conductive polymer layer 2 is swollen by the absorption of liquid oil hydrocarbons.

[0048] As shown in Figures 3 to 5 , the first external wire 4 and the second external wire 5 are respectively located on both sides of the central insulator 3 in the radial direction; the first peripheral insulator 6 and the second peripheral insulator 7 are respectively located on both sides of the central insulator 3 in the radial direction; and the first conductor 8 and the second conductor 9 are respectively located on both sides of the central insulator 3 in the radial direction. This layout achieves the radial and circumferential insulation of the first external wire 4 and the second external wire 5 relative to each other.

[0049] [Oil product storage tank bottom leakage detection system]

[0050] As a specific application of the oil leakage detection cable 100, the oil leakage detection of the tank bottom B of the oil storage tank 2000 shown in the structure of Figure 1 and Figure 2 is described herein. Note that in the following description, the description of the features and operation of the aforementioned oil leakage detection cable 100 is omitted for brevity.

[0051] Referring to Figure 6 , the oil storage tank bottom leakage detection system 1000 includes a plurality of the aforementioned oil leakage detection cables 100 and a plurality of online resistance testers 200. The plurality of oil leakage detection cables 100 are arranged on the tank bottom B of the oil storage tank 2000 and are arranged at intervals in a single direction, and the plurality of oil leakage detection cables 100 cross the tank bottom B of the oil storage tank 2000 in the single direction. The head end of the first conductive core wire 42 of the first external connection wire 4 and the head end of the second conductive core wire 52 of the second external connection wire 5 of each oil leakage detection cable 100 are electrically connected to a corresponding one of the online resistance testers 200, and the online resistance tester 200 is used to determine whether oil leakage from the tank bottom B of the oil storage tank 2000 is detected on the oil leakage detection cable 100 by sensing a change in resistance on the oil leakage detection cable 100.

[0052] In the oil storage tank bottom leakage detection system 1000, the tank bottom B of the oil storage tank 2000 is regionally divided in the single direction by arranging the plurality of the aforementioned oil leakage detection cables 100 at intervals in the single direction, so that compared with the background art arrangement of the liquid guide pipe 3000, not only can the leakage of the tank bottom B be detected as early as possible, but also the location of the leakage of the tank bottom B of the oil storage tank 2000 can be more accurately detected, and thus the technician can find the specific cause of the leakage as early as possible and take corresponding measures, so that the damage degree of the oil storage tank 2000 and the corresponding derived production cost are greatly reduced, and in addition, the severity of soil pollution is also reduced.

[0053] In Figure 6 , five oil leakage detection cables 100 are given. The number of oil leakage detection cables 100 can be appropriately determined according to cost requirements and oil leakage detection accuracy requirements. The plurality of oil leakage detection cables 100 can be arranged at equal intervals or at unequal intervals.

[0054] In order to facilitate remote monitoring, as Figure 6As shown, the oil tank bottom leakage detection system 1000 can further include an HMI (Human Machine Interface) 300. The HMI 300 is communicatively connected to each of the online resistance testers 200 to at least perform online monitoring, querying, and alarming operations. The HMI 300 can be connected to the plurality of online resistance testers 200 through an RS485 serial communication interface and a MODBUS communication protocol.

[0055] In order to facilitate replacement of the oil leakage detection cable 100, as shown, Figure 7 The oil tank bottom leakage detection system 1000 further includes a plurality of plastic tubes 400, each of which is sleeved on a corresponding oil leakage detection cable 100. Each plastic tube 400 is provided with a plurality of through holes 400a along the entire length, each of which is used for allowing oil leaked from the tank bottom B of the oil tank 2000 to drop into it. Figure 7 In the embodiment, only one plastic tube 400 is shown.

[0056] In order to further improve the service life of the plastic tube 400, the plastic tube 400 can be a polytetrafluoroethylene tube, which has excellent high and low temperature resistance, corrosion resistance, insulation resistance, atmospheric aging resistance, and non-flammability, and is very suitable for long-term detection of oil leakage.

[0057] As shown, Figure 7 Each through hole 400a is arranged along the length of the corresponding plastic tube 400, and the plurality of through holes 400a distributed along the entire length are spaced apart from each other.

[0058] Generally, the inner diameter of the plastic tube 400 is relatively large to facilitate the oil leakage detection cable 100 to pass into the plastic tube 400. Since the oil leakage detection cable 100 placed in the plastic tube 400 will adhere to the bottom of the inner wall of the plastic tube 400 due to its own weight, in order to further allow the oil leaked from the tank bottom B to drop more closely into each through hole 400a from the plastic tube 400, each through hole 400a can be located below the central horizontal plane 400b of the plastic tube 400.

[0059] In an embodiment, the plurality of through holes 400a distributed along the entire length are on the same generatrix. In another embodiment, in the up-down direction, each through hole 400a is arc-shaped along the entire length and consistent with the arc shape of the corresponding part of the outer surface of the tank bottom B, so that the distance between the plurality of through holes 400a on one plastic tube 400 and the corresponding part of the outer surface of the tank bottom B in the up-down direction is consistent, thereby improving the timeliness of oil leakage detection.

[0060] In addition, as shown, Figure 6As shown, the oil tank bottom leakage detection system 1000 further comprises a plurality of insulation caps 500, each of which is sealed to the free end of a corresponding plastic tube 400, thereby protecting the end of the oil leakage detection cable 100, and in addition, each of the insulation caps 500 can be detachable, thereby facilitating replacement of the oil leakage detection cable 100.

[0061] It is noted that the oil of the oil tank 2000 of the present disclosure can be crude oil or refined oil.

[0062] It is further noted that although the oil leakage detection cable 100 and the oil tank bottom leakage detection system 1000 of the present disclosure are directed to oil tanks 2000 having a conical bottom B, the oil leakage detection cable 100 and the oil tank bottom leakage detection system 1000 of the present disclosure are also applicable to oil tanks 2000 having a flat bottom B. Figure 1 and Figure 2 It is noted that the oil of the oil tank 2000 of the present disclosure can be crude oil or refined oil.

[0063] The foregoing detailed description has set forth various exemplary embodiments of the systems and / or techniques described herein. However, the foregoing is not intended to limit the application to the form or embodiments disclosed. It is therefore intended that this disclosure be considered in all its aspects as illustrative and that followings claims be construed as limiting only as to the scope of the application.

Claims

1. An oil leak detection cable (100) characterized by, The oil leakage detection cable (100) is suitable for oil leakage detection, and is arranged below an object storing oil to be detected. The oil leakage detection cable (100) comprises a porous insulating sheath (1), a conductive polymer layer (2), a central insulator (3), a first external connecting wire (4), a second external connecting wire (5), a first peripheral insulator (6), a second peripheral insulator (7), a first conductor (8), and a second conductor (9) arranged along the whole length of the oil leakage detection cable (100). The porous insulating sheath (1) allows the leaked liquid oil to penetrate from the outside of the oil leakage detection cable (100) to the inside of the porous insulating sheath (1) through the holes of the porous insulating sheath (1). The conductive polymer layer (2) is arranged in a tubular shape on the inside of the porous insulating sheath (1), and can absorb the hydrocarbon of the liquid oil to expand. The central insulator (3) is located in the center of the conductive polymer layer (2). The first external connecting wire (4), the first peripheral insulator (6), the first conductor (8), the second external connecting wire (5), the second peripheral insulator (7), and the second conductor (9) are arranged in sequence around the central insulator (3) in the conductive polymer layer (2) and fixed together with the central insulator (3), and the first external connecting wire (4) and the second conductor (9) are adjacent in the circumferential direction. The first external connecting wire (4) comprises a first insulating layer (41) and a first conductive core wire (42), and the first conductive core wire (42) is wrapped in the first insulating layer (41). The second external connecting wire (5) comprises a second insulating layer (51) and a second conductive core wire (52), and the second conductive core wire (52) is wrapped in the second insulating layer (51), and the end of the first conductive core wire (42) is electrically connected to the first conductor (8), and the end of the second conductive core wire (52) is electrically connected to the second conductor (9), or the end of the first conductive core wire (42) is electrically connected to the second conductor (9), and the end of the second conductive core wire (52) is electrically connected to the first conductor (8). Before the conductive polymer layer (2) absorbs the hydrocarbon of the liquid oil to expand, the first conductor (8) and the second conductor (9) are radially spaced apart from the conductive polymer layer (2), When the liquid oil is immersed into the inside of the porous insulating sheath (1) through the porous insulating sheath (1) and contacts the conductive polymer layer (2), the conductive polymer layer (2) absorbs the hydrocarbon of the liquid oil and expands, and then the expanded conductive polymer layer (2) contacts the first conductor (8) and the second conductor (9), so that the expanded conductive polymer layer (2), the first conductor (8), the second conductor (9), the first conductive core wire (42) of the first external connecting wire (4), and the second conductive core wire (52) of the second external connecting wire (5) form an electrically conductive path.

2. The oil leakage detection cable (100) according to claim 1, wherein The porous insulating sheath (1) is a woven insulating material.

3. The oil leakage detection cable (100) according to claim 2, wherein The woven insulating material is a fluorine-containing fiber woven material.

4. The oil leakage detection cable (100) according to claim 1, wherein The conductive polymer layer (2) is an oil-swollen conductive rubber.

5. The oil leak detection cable (100) of claim 4, wherein, The oil-swollen conductive rubber is a one-piece and includes a rubber matrix, an oil-philic component, and a conductive agent.

6. The oil leak detection cable (100) of claim 4, wherein, The oil-swollen conductive rubber includes an oil-swollen rubber in a tubular shape and a conductive layer provided on an inner circumferential surface of the oil-swollen rubber in a tubular shape.

7. The oil leakage detection cable (100) according to claim 1, wherein The central insulator (3), the first outer lead (4), the second outer lead (5), the first peripheral insulator (6), the second peripheral insulator (7), the first conductor (8), and the second conductor (9) are twisted together.

8. The oil leakage detection cable (100) according to claim 1, wherein The diameters of the first conductor (8) and the second conductor (9) are smaller than the diameters of the central insulator (3), the first outer lead (4), the second outer lead (5), the first peripheral insulator (6), and the second peripheral insulator (7).

9. The oil leakage detection cable (100) according to claim 1, wherein The first outer lead (4) and the second outer lead (5) are respectively positioned on both sides of the central insulator (3) in a radial direction; The first peripheral insulator (6) and the second peripheral insulator (7) are respectively positioned on both sides of the central insulator (3) in a radial direction; The first conductor (8) and the second conductor (9) are respectively positioned on both sides of the central insulator (3) in a radial direction.

10. Use of the oil leakage detection cable (100) according to any one of claims 1 to 9 in oil leakage detection, wherein the oil leakage detection cable (100) is arranged below an object storing an oil to be detected, and an oil leakage point is detected by monitoring an electric resistance between the first conductor (8), the second conductor (9), the first outer lead (4), and the second outer lead (5).

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