Medium-voltage three-core cable with water-blocking and voltage-withstanding detection functions

Abstract

The utility model belongs to the field of cables, and provides a medium-voltage three-core cable with water-blocking and voltage-withstanding detection functions, which comprises a plurality of wire cores which are annularly distributed at equal intervals. The cable comprises a plurality of cable cores, filling ropes and a semi-conductive water-blocking tape binding layer, the plurality of cable cores can be filled by the filling ropes, and the semi-conductive water-blocking tape binding layer is wrapped and overlapped so as to fasten and fix the cabled cable cores. And the corrugated aluminum sheath is extruded on the semi-conductive water-blocking tape binding layer, and the semi-conductive buffer water-blocking tape binding layer can expand when encountering water so as to abut against the corrugated aluminum sheath. Compared with the prior art, the cable has the advantages that the corrugated aluminum sheath is extruded outside the wire cores, so that the longitudinal water-blocking performance of the cable is improved, and the flexibility and durability of the cable are ensured; and meanwhile, the corrugated aluminum sheath and the semi-conductive layer are respectively used as electrodes to be connected to a withstand voltage test device, so that the withstand voltage test of the cable sheath is realized, the safety and the stability of the cable in practical application are ensured, and the safe operation of the cable is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cable field, concretely relates to a middle voltage three -core cable with water -resisting and pressure detection function. BACKGROUND

[0002] Traditional middle voltage three -core cable usually is insulated wire core outer wrapping metal shield, and after wrapping, three wire cores are cabled according to certain stranding pitch, and the required filling rope is filled between wire cores. However, this structure has some shortcomings:

[0003] (1) Cable longitudinal water -resisting performance: when laying or running environment has someone or humidity is larger, cable is easy to be damp, and the service life of cable is affected.

[0004] (2) Cable sheath cannot carry out pressure test: in the process of using, the defects of cable sheath cannot be found, that is, whether cable insulation breakdown occurs under normal current can not be detected in real time, and then the safety hazard of cable operation is brought. UTILITY MODEL CONTENTS

[0005] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a middle voltage three -core cable with water -resisting and pressure detection function, which can prevent cable from being damp and improve the safety of cable use under cable sheath pressure test.

[0006] The utility model solves the technical problems by adopting the technical scheme that a middle voltage three -core cable with water -resisting and pressure detection function is provided, which comprises: a plurality of wire cores distributed at equal intervals in a ring shape;

[0007] The filling rope and the semi -conductive water -resisting tape binding layer, a plurality of wire cores can be filled with the filling rope, and the semi -conductive water -resisting tape binding layer is wrapped and covered, so as to tighten and fix the cabled wire core;

[0008] The corrugated aluminum sheath is extruded on the semi -conductive water -resisting tape binding layer, and the semi -conductive water -resisting tape binding layer can be expanded and tightly contacted with the corrugated aluminum sheath when water is encountered, so as to realize the longitudinal water -resisting of the cable.

[0009] The protective layer and the semi -conductive layer, the protective layer is covered on the corrugated aluminum sheath, and is used for preventing wire core damage;The semi -conductive layer is extruded on the protective layer, and the semi -conductive layer and the corrugated aluminum sheath can be respectively used as an electrode, and be connected with external pressure test equipment, so as to detect whether insulation breakdown occurs under normal current.

[0010] In the above-mentioned middle voltage three -core cable with water -resisting and pressure detection function, the plurality of wire cores jointly form a central gap, and the central gap is filled with temperature measuring optical fiber, so as to detect the temperature abnormal state of the cable body and carry out monitoring and fault positioning.

[0011] In the medium voltage three-core cable with water-blocking and pressure resistance detection function, the filling rope is a water-blocking polypropylene filling rope.

[0012] In the medium voltage three-core cable with water-blocking and pressure resistance detection function, the protective layer comprises an aluminum sleeve anti-corrosion layer and a polyethylene protective layer, the corrugated aluminum sheath is coated with asphalt to form the aluminum sleeve anti-corrosion layer, and the polyethylene protective layer is extruded on the aluminum sleeve anti-corrosion layer.

[0013] In the medium voltage three-core cable with water-blocking and pressure resistance detection function, the polyethylene protective layer and the semi-conductive layer are double-layer co-extruded.

[0014] In the medium voltage three-core cable with water-blocking and pressure resistance detection function, the core is sequentially wrapped with a conductor, a conductor shielding layer, an insulation layer and a shielding layer from inside to outside.

[0015] In the medium voltage three-core cable with water-blocking and pressure resistance detection function, the shielding layer comprises an insulation shielding layer and a metal shielding layer which are sequentially wrapped on the insulation layer.

[0016] In the medium voltage three-core cable with water-blocking and pressure resistance detection function, the core is circularly arranged after being filled with the filling rope.

[0017] In the medium voltage three-core cable with water-blocking and pressure resistance detection function, the thickness of the semi-conductive layer is 0.3mm.

[0018] In the medium voltage three-core cable with water-blocking and pressure resistance detection function, the inner diameter of the corrugated aluminum sheath is 2.0mm-3.0mm smaller than the core wrapped with the semi-conductive buffer water-blocking tape binding layer.

[0019] Compared with the prior art, the utility model has the advantages of:

[0020] (1) the medium voltage three-core cable with water-blocking and pressure resistance detection function expands against the corrugated aluminum sheath by the semi-conductive buffer water-blocking tape binding layer, which not only improves the longitudinal water-blocking performance of the cable, but also ensures the flexibility and durability of the cable; meanwhile, the corrugated aluminum sheath and the semi-conductive layer are connected to the pressure resistance test equipment as electrodes respectively to realize the pressure test of the cable sheath, which ensures the safety and stability of the cable in actual application. This method can timely find and solve the potential insulation breakdown problem, further ensuring the safe operation of the cable.

[0021] (2) Through the built-in temperature measuring optical fiber, the cable can monitor the temperature condition of itself in real time, including temperature rise change and abnormal state, thereby providing fault positioning function. This not only improves the safety and reliability of the cable operation, but also reduces the complexity and workload of maintenance work, and realizes intelligent management of the cable.

[0022] (3) The use of corrugated aluminum sheath can ensure the flexibility of the cable, facilitating production and laying. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of the present application.

[0024] In the figure, 1, core; 10, central gap; 100, temperature measuring optical fiber; 11, conductor; 12, conductor shielding layer; 13, insulation layer; 14, shielding layer; 140, insulation shielding layer; 141, metal shielding layer;

[0025] 2, filling rope;

[0026] 3, semi-conductive water-blocking tape layer;

[0027] 4, corrugated aluminum sheath;

[0028] 5, protective layer; 50, aluminum sheath corrosion-resistant layer; 51, polyethylene sheath;

[0029] 6, semi-conductive layer. DETAILED DESCRIPTION

[0030] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in combination with the drawings, but the present application is not limited to these embodiments.

[0031] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications will also change accordingly.

[0032] For example, Figure 1As shown, the utility model discloses a kind of medium voltage three-core cables with water blocking and pressure detection function, comprising: a plurality of wire cores 1 in ring shape equidistant distribution;Fill the rope 2 and semiconductive water-blocking tape binding layer 3, a plurality of wire cores 1 can be filled by fill the rope 2, and around the package cover semiconductive water-blocking tape binding layer 3, to be tightly fixed after cable after wire core 1;Rough aluminium sheath 4, it is extruded in semiconductive water-blocking tape binding layer 3, semiconductive buffer water-blocking tape binding layer can be tightly in rough aluminium sheath 4 when meeting water, to realize the longitudinal water blocking of cable;Protective layer 5 and semiconductive layer 6, protective layer 5 covers in rough aluminium sheath 4, for preventing wire core 1 damage;Semiconductive layer 6 is extruded in protective layer 5, and semiconductive layer 6 and rough aluminium sheath 4 can be respectively as an electrode, and connect external pressure test equipment, to detect whether cable will occur insulation breakdown under normal current.

[0033] Specifically, the embodiment mainly realizes the cabling of three-core cable, in this process, three wire cores 1 are filled by fill the rope 2, and around the package cover semiconductive buffer water-blocking tape binding layer on the cabling wire core 1, to ensure that wire core 1 is tightly fixed after cabling. Figure 1 As shown, then, the embodiment is extruded in the semiconductive buffer water-blocking tape binding layer outside semiconductive buffer water-blocking tape binding layer, which not only provides additional mechanical protection for cable, but also helps to improve the flexibility and bending performance of cable due to its unique corrugated structure, not only that, when meeting moisture, it is tightly attached to the inside of rough aluminium sheath 4 after absorbing water and expanding by semiconductive buffer water-blocking tape binding layer (similar to tampon), effectively preventing water from penetrating along the length direction of cable, thereby realizing longitudinal water blocking function. Finally, cover protective layer 5 outside rough aluminium sheath 4 to prevent external physical damage, and extrude a layer of semiconductive layer 6 on it, it is worth noting that rough aluminium sheath 4 and semiconductive layer 6 in the embodiment can be connected to external pressure test equipment as a complete electrode system (i.e. one positive and one negative are connected for detection), according to pressure test requirement, whether cable will occur insulation breakdown under normal current can be detected, finally determine whether the insulation performance of the cable under different voltage conditions can meet the standard of safe use, therefore, the cable structure cooperates pressure test to find potential insulation problem in time, ensure the safety and stability of cable in practical application, greatly improve the overall performance and service life of cable.

[0034] A plurality of wire cores 1 form a central gap 10 together, and the central gap 10 is filled with temperature measuring optical fiber 100 to detect temperature abnormal state of cable body for monitoring and fault positioning.

[0035] As shown, Figure 1As shown, the three cores 1 in this embodiment are arranged in a ring shape at equal intervals, and together form a central gap 10. This layout provides sufficient space for the filling of the temperature measuring optical fiber 100. Moreover, since the central gap 10 is surrounded by the cores 1, the temperature is relatively high compared to other positions. In addition, the temperature measuring optical fiber 100 itself has the characteristics of high sensitivity and fast response, and thus can monitor the internal temperature changes of the cable in real time and accurately. That is, during the operation of the cable, the temperature measuring optical fiber 100 continuously collects temperature data of different positions along the cable through the built-in sensor network, and transmits these data to the external data processing unit. With the analysis of the received temperature information by the external data processing unit, once abnormal temperature rise or local hot spots are found, the system immediately issues an alarm and provides accurate location information to help the operation and maintenance personnel quickly locate the problem area. Therefore, the monitoring of the temperature state, temperature change and temperature abnormality of the cable body and the fault positioning make the cable have the functions of sensing and diagnosing, and at the same time provide fault positioning, which reduces the complexity and workload of maintenance work and realizes the intelligent management of the cable.

[0036] Preferably, in this embodiment, the water-blocking polypropylene filling rope 2 is used instead of the conventional ordinary filling rope 2, and the water-blocking polypropylene filling rope 2 has excellent water absorption and expansion characteristics. When the cable is attacked by external water, the water-blocking polypropylene filling rope 2 will rapidly absorb water and expand, thereby tightly filling the gap between the cores 1 and preventing water from penetrating along the length direction of the cable. Similarly, the semi-conductive buffer water-blocking tape binding layer is used instead of the ordinary binding tape, and the semi-conductive buffer water-blocking tape has good water-blocking performance. When the cable encounters water, the material will expand against the corrugated aluminum sheath 4 to form an effective sealing barrier to prevent water from entering, thereby effectively avoiding the cable from being damp and prolonging the service life of the cable.

[0037] Further preferably, in this embodiment, an aluminum pipe is extruded around the semi-conductive buffer water-blocking tape core 1 by an aluminum extrusion machine (not shown in the figure), and then the corrugated aluminum sheath 4 is formed by a corrugation machine (not shown in the figure). Preferably, the inner diameter (the peak of the inner wall, not shown in the figure) of the corrugated aluminum sheath 4 after corrugation is 2.0mm-3.0mm smaller than the core 1 (the valley of the outer wall, not shown in the figure) of the semi-conductive buffer water-blocking tape binding layer, so as to achieve good longitudinal water-blocking function.

[0038] The protective layer 5 includes an aluminum sleeve corrosion-resistant layer 50 and a polyethylene sheath 51. The corrugated aluminum sheath 4 is coated with asphalt to form the aluminum sleeve corrosion-resistant layer 50, and the polyethylene sheath 51 is extruded around the aluminum sleeve corrosion-resistant layer 50.

[0039] Further preferably, in this embodiment, a layer of asphalt is further coated on the aluminum sheath as the aluminum sleeve corrosion-resistant layer 50, as shown in Figure 1As shown, asphalt, as a common anticorrosive material, has excellent weather resistance and waterproofness. The asphalt layer coated outside the corrugated aluminum sheath 4 can effectively isolate external air, moisture and other corrosive substances, prevent the aluminum sheath from oxidation and corrosion, and also make the corrugated aluminum sheath 4 able to work stably in harsh environments for a long time, reduce the cable damage and replacement frequency caused by corrosion, thereby significantly prolonging the service life of the cable. Moreover, the construction of the asphalt coating is relatively simple and low in cost, which is suitable for mass production. In addition, the asphalt coating has a certain self-repairing ability, and can self-repair to a certain extent even if there is a slight scratch. It should be noted that the medium-density polyethylene sheath 51 is adopted in this embodiment, which has good wear resistance, impact resistance and flexibility, can effectively resist external physical damage such as friction and impact, and protect the internal structure from damage. At the same time, relying on the excellent weather resistance of the polyethylene material, it can maintain stable performance in various climate conditions and is not easy to age, become brittle or crack, which is suitable for a wide range of geographical areas and application environments. Finally, polyethylene is a non-toxic, odorless and recyclable material, which meets the modern environmental protection requirements and will not pollute the environment.

[0040] Further preferably, as Figure 1 As shown, after coating a layer of asphalt as the aluminum sheath anticorrosive layer 50 outside the corrugated aluminum sheath 4, a double-layer co-extrusion of a medium-density polyethylene sheath 51 and a semiconductive layer 6 is performed. It should be noted that the semiconductive layer 6 (preferably 0.3 mm in thickness) is located outside the polyethylene sheath 51 and is not in direct contact with the corrugated aluminum sheath, and serves as an electrode for pressure test. This design can effectively disperse the local discharge phenomenon, reduce the risk of cable damage caused by local discharge, and improve the electrical performance of the cable.

[0041] As shown in Figure 1 The conductor 11, the conductor shielding layer 12, the insulation layer 13 and the shielding layer 14 are sequentially wrapped outside the conductor 11 in the wire core 1. The wire core 1 (the conductor 11) is wrapped with the shielding layer 14, and then the three wire cores 1 are cabled at a certain stranding pitch and filled with the water-blocking polypropylene filling rope 2. Preferably, through the effective cooperation of the various layers of materials, the wire core 1 can be filled with the water-blocking polypropylene filling rope 2 to form a circular shape, which is convenient for the molding of the required cable model.

[0042] Preferably, the shielding layer 14 in the embodiment comprises an insulating shielding layer 140 and a metal shielding layer 141 wrapped in the insulating layer 13 in sequence, wherein the insulating shielding layer 140 can effectively disperse the partial discharge phenomenon, prevent the cable damage caused by the partial discharge, and prolong the service life of the cable; and the metal shielding layer 141 can effectively shield the external electromagnetic interference, ensure the stability of the signal transmission, and be suitable for occasions with high electromagnetic compatibility requirements, and meanwhile, the metal shielding layer 141 can provide a reliable grounding path, help to release the static electricity accumulation, and reduce the risk of faults caused by static electricity.

[0043] It should be noted that the descriptions such as "first", "second", "one" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited. The terms "connection", "fixation" and the like should be interpreted broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0045] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A medium voltage three-core cable having a water-blocking and pressure-resistance detecting function, characterized by, The utility model relates to a kind of cable, including: Several wire cores in equidistant distribution in ring shape; Filler rope and semiconductive water-blocking tape layer, several wire cores can be filled by the filler rope, and the semiconductive water-blocking tape layer is covered, to tighten and fix wire core after cabling; Rough aluminium sheath, which is extruded on the semiconductive water-blocking tape layer, the semiconductive water-blocking tape layer can be tightly contacted with the rough aluminium sheath when encountering water, to realize longitudinal water-blocking of cable; Protective layer and semiconductive layer, the protective layer is covered on the rough aluminium sheath, to prevent wire core damage;The semiconductive layer is extruded on the protective layer, and the semiconductive layer and the rough aluminium sheath can be respectively as an electrode, and connected to external voltage-withstanding test equipment, to detect whether insulation breakdown of cable will occur under normal current.

2. The medium voltage three-core cable with water-blocking and pressure-resistance detection function according to claim 1, characterized in that, Several wire cores collectively form a central gap, which is filled with temperature measuring optical fiber to detect temperature abnormal state of cable body for monitoring and fault location.

3. The medium voltage three-core cable with water-blocking and pressure detection functions according to claim 1, characterized in that, The filler rope is water-blocking polypropylene filler rope.

4. The medium voltage three-core cable with water-blocking and pressure detection functions according to claim 1, characterized in that, The protective layer includes aluminium sleeve corrosion-resistant layer and polyethylene sheath, the rough aluminium sheath is coated with asphalt to form the aluminium sleeve corrosion-resistant layer;The polyethylene sheath is extruded on the aluminium sleeve corrosion-resistant layer.

5. The medium voltage three-core cable with water-blocking and pressure detection functions according to claim 4, characterized in that, The polyethylene sheath and semiconductive layer are double-layer co-extrusion.

6. The medium voltage three-core cable with water-blocking and pressure detection functions according to claim 1, characterized in that, The wire core is sequentially wrapped with conductor, conductor shield layer, insulation layer and shield layer from inside to outside.

7. The medium voltage three-core cable with water-blocking and pressure detection functions according to claim 6, characterized in that, The shield layer includes insulation shield layer and metal shield layer wrapped on the insulation layer in sequence.

8. The medium voltage three-core cable with water-blocking and pressure detection functions according to claim 1 or 3, characterized in that, The wire core is circular after being filled by the filler rope.

9. The medium voltage three-core cable with water-blocking and pressure detection functions according to claim 1, characterized in that, The thickness of the semiconductive layer is 0.3mm.

10. The medium voltage three-core cable with water-blocking and pressure detection functions according to claim 1, characterized in that, The inner diameter of the rough aluminium sheath is less than 2.0mm-3.0mm of wire core wrapped with the semiconductive water-blocking tape layer.

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