Cable joint

Abstract

The utility model discloses a cable joint, which is arranged at a cable joint and comprises an outer protective layer, a middle joint, a data processing module and a power taking device. A cavity is arranged in the outer protective layer, and a wire is arranged in the cavity. The intermediate joint is arranged in the cavity and is connected with the wire; the intermediate joint is provided with a main body and a shielding layer sleeved outside the main body, and the shielding layer is connected with the current sensor. The data processing module is arranged in the cavity, and the data processing module is connected with the current sensor so as to process signals transmitted by the current sensor. The electricity taking device is arranged close to the wire, and the electricity taking device is connected with the current sensor and the data processing module so as to provide electric energy for the current sensor and the data processing module. The cable joint provided by the utility model can accurately detect the partial discharge capacity of the intermediate joint with low energy consumption, and ensures the accuracy and real-time performance of detection values.

Description

TECHNICAL FIELD

[0001] The present application relates to the high-voltage electric technology field, in particular to a cable joint. BACKGROUND

[0002] Partial discharge is a bridge discharge behavior caused by uneven electric field distribution and concentrated air gap (void) on the surface or inside of insulating material. In general cases, when the detected partial discharge value exceeds the limited threshold, partial discharge accumulation effect will occur. Partial discharge accumulation will increase the insulation deterioration degree of electrical products, and then cause irreversible damage to electrical products. Through early warning of partial discharge phenomenon, operation and maintenance work is carried out in advance to avoid further damage of partial discharge phenomenon to intermediate joints, and then cause large-scale damage such as power outage. However, due to the harsh working environment of intermediate joints, the waterproof insulation requirement of intermediate joints and other reasons, partial discharge monitoring of intermediate joints faces many difficulties and has great difficulty in implementation. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide a cable joint, which aims to solve the problems of high energy consumption, inaccurate and untimely detection results of partial discharge detection of cable joints.

[0004] To achieve the above purpose, the utility model provides a cable joint, which is arranged at the cable connection position, characterized in that the cable joint comprises:

[0005] An outer protective layer is arranged in the cavity, and a wire is arranged in the cavity.

[0006] An intermediate joint is arranged in the cavity and connected with the wire; the intermediate joint is provided with a main body and a shielding layer sleeved outside the main body, and the shielding layer is connected with a current sensor.

[0007] A data processing module is arranged in the cavity, and the data processing module is connected with the current sensor to process the signals transmitted by the current sensor.

[0008] A power taking device is arranged near the wire, and the power taking device is connected with the current sensor and the data processing module to provide power for the current sensor and the data processing module.

[0009] Optionally, in an embodiment of the utility model, the outer protective layer comprises a waterproof layer and an armored belt layer wrapped outside the waterproof layer.

[0010] Optionally, in an embodiment of the utility model, the power taking device is sleeved outside the wire.

[0011] Optionally, in an embodiment of the utility model, the data processing module is further connected with an antenna, the antenna is arranged outside the cable joint, and the antenna and the data processing module are connected through a transmission line.

[0012] Optionally, in an embodiment of the utility model, the number of intermediate joints is multiple.

[0013] Optionally, in an embodiment of the utility model, the shielding layer of each intermediate joint is connected with a current sensor respectively.

[0014] Optionally, in an embodiment of the utility model, the shielding layer of each intermediate joint is connected with a current sensor after being connected.

[0015] Optionally, in an embodiment of the utility model, the wire and the shielding layer are further provided with a first semi-conductive belt at the connection position.

[0016] Optionally, in an embodiment of the utility model, the wire is further provided with a semi-conductive layer near the port of the intermediate joint.

[0017] Optionally, in an embodiment of the utility model, a gap is further formed between the main body, the shielding layer and the wire, and sealing glue is arranged in the gap.

[0018] Optionally, in an embodiment of the utility model, the shielding layer is a copper mesh.

[0019] The cable joint of the utility model obtains the partial discharge amount in time and accurately through the shielding layer and the current sensor arranged outside the main body of the intermediate joint, processes and analyzes the size of the partial discharge amount in time through the data processing module, obtains the electric quantity by using the electric energy on the wire through the power taking device, and transmits the electric quantity to the current sensor and the data processing module to supply power for the current sensor and the data processing module, thereby reducing the partial discharge detection power consumption. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained from the structure shown in the drawings without creative labor.

[0021] Figure 1 It is a partial cross-sectional schematic view of an embodiment of the cable joint of the utility model.

[0022] Figure 2 It is a partial cross-sectional schematic view of an embodiment of the intermediate joint in the utility model.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 100, cable joint; 11, outer sheath; 111, armor tape layer; 112, waterproof layer; 12, cavity; 13, power taking device; 14, data processing module; 15, antenna; 16, transmission line; 17, current sensor; 200, intermediate joint; 21, shielding layer; 22, main body; 221, stress body; 222, second semiconductive tape; 223, connecting pipe; 224, wire core; 23, first semiconductive tape; 24, semiconductive layer; 25, gap; 26, sealant; 27, stress cone; 28, second elastic part; 30, cable; 31, outer sheath; 32, steel armor part; 33, inner sheath; 34, first elastic part; 35, wire.

[0025] The realization, functional features and advantages of the utility model will be further described in combination with embodiments with reference to the drawings. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0027] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative position 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 also change accordingly.

[0028] In addition, the description of "first", "second" and the like in the utility model is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" in the full text includes three schemes, taking A and / or B as an example, including A technical scheme, B technical scheme, and A and B simultaneously satisfying the technical scheme. In addition, the technical schemes of various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art, and when the combination of technical schemes appears contradictory or unachievable, it should be considered that the combination of technical schemes does not exist, and is not within the protection scope required by the utility model.

[0029] Partial discharge is a bridge discharge behavior caused by uneven electric field distribution and concentrated air gap on the surface or inside of insulating material. In general case, when the detected partial discharge value exceeds the defined threshold, partial discharge accumulation effect will occur. Partial discharge accumulation will increase the degree of insulation deterioration of electrical products, and thus cause irreversible damage to electrical products. Through early warning of partial discharge phenomenon, maintenance work is carried out in advance to avoid further damage of partial discharge phenomenon to intermediate joint, and thus cause large-scale damage such as power outage. However, due to the harsh working environment of intermediate joint, waterproof insulation requirements of intermediate joint and other reasons, partial discharge monitoring of intermediate joint faces many difficulties and has great difficulty in implementation.

[0030] Therefore, the cable joint 100 of the utility model obtains the partial discharge quantity in time and accurately through the shielding layer 21 and the current sensor 17 arranged outside the main body 22 of the intermediate joint 200, can process and analyze the size of the partial discharge quantity in time through the data processing module 14, and can obtain the electric energy through the wire 35 through the power taking device 13 and transmit the electric energy to the current sensor 17 and the data processing module 14 to supply power for the current sensor 17 and the data processing module 14, thereby reducing the partial discharge quantity detection power consumption.

[0031] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings.

[0032] As shown in Figures 1-2 The utility model discloses a kind of cable joints 100, be located at cable 30 connecting place, the cable joint 100 includes outer sheath 11, intermediate joint 200, data processing module 14 and power taking device 13.The outer sheath 11 is equipped with cavity 12, the wire 35 is equipped in the cavity 12.The intermediate joint 200 is located in the cavity 12, and is connected with the wire 35;The intermediate joint 200 is equipped with main body 22 and the shielding layer 21 sleeved on the main body 22, and the shielding layer 21 is connected with current sensor 17.The data processing module 14 is located in the cavity 12, and the data processing module 14 is connected with the current sensor 17 to process the signal transmitted by it.The power taking device 13 is adjacent to the wire 35 and is arranged, and the power taking device 13 is connected with the current sensor 17, data processing module 14, to provide electric energy for the current sensor 17, data processing module 14.

[0033] It can be understood that the cable joint 100 is also called cable head. After the cable 30 is laid, in order to make it a continuous line, each section of the line must be connected as a whole, and these connection points are called cable joints 100. The cable joint 100 at the middle part of the cable line is called an intermediate joint 200, and the cable joint 100 at the two ends of the line is called a terminal head. The cable joint 100 is used to lock and fix the incoming and outgoing lines, and plays a role in waterproof, dustproof and shockproof. As shown in Figure 1 , between the two cables 30, there is a cable joint 100, the cable joint 100 includes an outer sheath 31, one end of the outer sheath 31 is wrapped around one end of a cable 30, the other end of the outer sheath 31 includes the other end of the other cable 30, and a cavity 12 is formed in the outer sheath 31. The cavity 12 is provided with a wire 35 and an intermediate joint 200. The two ends of the intermediate joint 200 are connected through the wire 35 and the cable 30 respectively. The intermediate joint 200 is provided with a main body 22 and a shielding layer 21 sleeved outside the main body 22, the shielding layer 21 is provided with ground connection, and the shielding layer 21 is connected with the current sensor 17. When partial discharge occurs, high-frequency pulse current will be generated at the ground end of the cable 30, which can be detected by the current sensor 17, and then the current partial discharge value can be obtained. The cavity 12 is also provided with a data processing module 14, and the data processing module 14 is connected with the current sensor 17 to process the signals transmitted by the current sensor 17. The cavity 12 is also provided with a power taking device 13, which is arranged adjacent to the wire 35 and connected with the current sensor 17 and the data processing module 14 respectively. The power taking device 13 can obtain the electrical energy on the wire 35 and transmit the electrical energy to the current sensor 17 and the data processing module 14 to provide electrical energy for the current sensor 17 and the data processing module 14. Preferably, the shielding layer 21 is a copper mesh.

[0034] It can be understood that, as shown in Figure 1 , the cable 30 internally includes the wire 35, the inner sheath 33, the steel armor part 32 and the outer sheath 31 from inside to outside. When the cable joint 100 is used to connect the cable 30, the side of the cable close to the intermediate joint 200 needs to be peeled off layer by layer, and finally only the wire 35 and the intermediate joint 200 are left to be connected. In order to ensure the stability of the connection of the cable joint 100, the two ends of the outer sheath 11 are covered outside the outer sheath 31. In order to prevent the steel armor part 32 from spreading from the inner sheath 33, the outer wall of the steel armor part 32 is also sleeved with a first elastic part 34. Preferably, the first elastic part 34 is a spring. As shown in Figure 2 , the intermediate joint 200 includes a main body 22. Preferably, the main body 22 is made of rubber material, such as silicone rubber, ethylene propylene diene rubber, etc. The two ends of the main body 22 are provided with stress cones 27. The middle part of the main body 22 is internally provided with a stress body 221, the stress body 221 is internally provided with a second semi-conductive belt 222, the second semi-conductive belt 222 is internally provided with a connecting pipe 223, and the connecting pipe 223 is internally provided with a wire core 224.

[0035] Further, in an embodiment of the present application, the outer protective layer 11 comprises a waterproof layer 112 and an armored tape layer 111 wrapped outside the waterproof layer 112.

[0036] It can be understood that when the cable is connected by the cable joint 100, the waterproof layer 112 can be wrapped outside the intermediate joint 200 and the wire 35, one end of the waterproof layer 112 is wrapped at one end of the cable 30, and the other end of the waterproof layer 112 is wrapped at one end of the other cable 30, so that the waterproof layer 112 and the two cables 30 form a cavity 12, and the cavity 12 contains the wire 35, the intermediate joint 200, the power taking device 13, the data processing module 14 and other elements. Since the two ends of the waterproof layer 112 are tightly wrapped with the one end of the two cables 30 respectively, water cannot enter the cavity 12 from the gap between the waterproof layer 112 and the cable 30, thereby ensuring the waterproof performance of the entire cable joint 100. The armored tape layer 111 is wrapped outside the waterproof layer 112. The armored tape, also known as the armor tape, can be made of glass fiber tape. It is a kind of glass fiber product made by weaving glass fiber into a fabric with high strength and high elasticity, and then coating a water-solidified high polymer compound on the surface of the woven tape. It has the characteristics of fast solidification when encountering water, simple operation and wide application range. The structure formed after solidification has high bending strength and tensile strength, is non-toxic, odorless and non-irritating, and is resistant to water and corrosion. By setting the armored tape layer 111 outside the waterproof layer 112, the overall strength of the cable joint 100 is ensured.

[0037] Further, in an embodiment of the present application, the power taking device 13 is sleeved outside the wire 35.

[0038] It can be understood that the power taking device 13 can obtain electric energy by using the electromagnetic energy induced around the high-voltage transmission wire 35. By sleeving the power taking device 13 outside the wire 35, the electric energy around the wire 35 can be better obtained, and the power taking efficiency is improved.

[0039] Further, in an embodiment of the present application, the data processing module 14 is further connected with an antenna 15, the antenna 15 is arranged outside the cable joint 100, and the antenna 15 and the data processing module 14 are connected through a transmission line 16.

[0040] It can be understood that by setting the antenna 15, the information in the data processing module 14 can be transmitted to the outside world in a wireless manner.

[0041] Further, in an embodiment of the present application, the number of the intermediate joints 200 is multiple.

[0042] It can be understood that the number of the intermediate joint 200 in the cavity 12 can be set as required, and can be one or multiple. When the number of the intermediate joint 200 is multiple, a current sensor 17 can be arranged corresponding to each intermediate joint 200. The multiple current sensors 17 are connected with the data processing module 14 respectively. Of course, when the number of the intermediate joint 200 is multiple, only one current sensor 17 can be arranged, and the shielding layers 21 of the multiple intermediate joints 200 are connected with the current sensor 17, and the current sensor 17 is connected with the data processing module 14.

[0043] Further, in an embodiment of the utility model, the shielding layer 21 is covered by the main body 22, and the two ends of the shielding layer 21 are connected with the outer wall of the wire 35 at the two end ports of the intermediate joint 200.

[0044] It can be understood that, as shown in the figure, Figure 2 the shielding layer 21 is covered by the main body 22, and the two ends of the shielding layer 21 are connected with the outer wall of the wire 35 at the two end ports of the intermediate joint 200. By arranging the first semi-conductive band 23 on the outer wall of the wire 35, the two ends of the shielding layer 21 are connected with the first semi-conductive band 23, so as to slow down the slope of the connection between the wire 35 and the shielding net. Preferably, the intermediate joint 200 further comprises a second elastic part 28, which is sleeved on the outer periphery of the connection between the shielding layer 21 and the outer wall of the wire 35, so as to prevent the shielding layer 21 from falling off the outer wall of the wire 35.

[0045] Further, in an embodiment of the utility model, the wire 35 is provided with a semi-conductive layer 24 near the port of the intermediate joint 200.

[0046] It can be understood that the semi-conductive layer 24 is arranged near the port of the intermediate joint 200 on the wire 35, so as to protect the insulating layer on the wire 35 and prevent the insulating layer from being damaged to cause partial discharge.

[0047] Further, in an embodiment of the utility model, a gap 25 is formed between the main body 22, the shielding layer 21 and the wire 35, and a sealing glue 26 is arranged in the gap 25.

[0048] It can be understood that, as shown in the figure, Figure 2 in order to prevent water from entering the inside of the main body 22 from the gap between the intermediate joint 200 and the wire 35, a gap 25 is further formed between the main body 22, the shielding layer 21 and the wire 35, and a sealing glue 26 is arranged in the gap 25.

[0049] The above merely describes optional embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

[0050] The above merely describes optional embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A cable joint (100) provided at a cable connection, characterized in that The cable joint (100) comprises: An outer sheath (11) with a cavity (12) inside, and a wire (35) in the cavity (12); An intermediate joint (200) in the cavity (12) and connected with the wire (35); the intermediate joint (200) is provided with a main body (22) and a shielding layer (21) sleeved outside the main body (22), and the shielding layer (21) is connected with a current sensor (17); A data processing module (14) in the cavity (12), connected with the current sensor (17) to process signals transmitted by the current sensor (17); A power taking device (13) arranged near the wire (35), connected with the current sensor (17) and the data processing module (14) to provide power for the current sensor (17) and the data processing module (14).

2. A cable joint (100) as claimed in claim 1, characterized in that The outer sheath (11) comprises a waterproof layer (112) and an armored tape layer (111) wrapped outside the waterproof layer (112).

3. A cable joint (100) as claimed in claim 1, characterized in that The power taking device (13) is sleeved outside the wire (35).

4. A cable joint (100) as claimed in claim 1, characterized in that The data processing module (14) is further connected with an antenna (15) arranged outside the cable joint (100), and the antenna (15) and the data processing module (14) are connected through a transmission line (16).

5. A cable joint (100) as claimed in claim 1, characterized in that The number of the intermediate joints (200) is multiple.

6. A cable joint (100) as claimed in claim 5, characterised in that, The shielding layer (21) of each intermediate joint (200) is connected with a current sensor (17) respectively.

7. A cable joint (100) as claimed in claim 5, characterised in that, The shielding layers (21) of each intermediate joint (200) are connected and connected with a current sensor (17).

8. A cable joint (100) as claimed in claim 1, characterized in that The wire (35) and the shielding layer (21) are further provided with a first semi-conductive tape (23) at the connection position.

9. A cable joint (100) as claimed in claim 1, characterized in that The wire (35) is further provided with a semi-conductive layer (24) near the port of the intermediate joint (200).

10. A cable joint (100) as claimed in claim 1, characterized in that A gap (25) is further formed between the main body (22), the shielding layer (21) and the wire (35), and a sealing glue (26) is arranged in the gap (25).

11. A cable joint (100) as claimed in claim 1, characterized in that The shielding layer (21) is a copper mesh.

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