High-voltage submarine cable land end grounding device

Abstract

The utility model discloses a high-voltage submarine cable land end grounding device, belongs to the field of cable equipment, and solves the problems of poor diversion performance, small contact area, easy loosening and the like caused by structural damage of a grounding device in the prior art. In the application, the metal conductor of the submarine cable end is electrically connected with the grounding buckle; the grounding buckle comprises a cylindrical armored clamp and a copper strip, the copper strip wraps the surface of a metal conductor at the end of the submarine cable, and the armored clamp is connected to the copper strip in a sleeving mode and makes contact with the copper strip in a pressing mode. The armoring clamp is a metal clamp and is connected with a grounding box through a wire. According to the land end grounding device for the high-voltage submarine cable, optimization is made in the aspects of increasing the contact area, reducing the contact resistance, enhancing the contact reliability and the like, abnormal temperature rise at the armored grounding position is avoided, and the risk of insulation breakdown of the submarine cable is reduced.

Description

Technical Field

[0001] The utility model relates to a high-voltage submarine cable land end grounding device, belonging to the field of cable equipment. Background Art

[0002] At present, submarine cables are used as the main arteries for transmitting electricity and information in offshore platforms and offshore wind farms. High-voltage and ultra-high-voltage submarine cables are more suitable for practical engineering applications. In order to meet the production and construction requirements of high-voltage and ultra-high-voltage marine cables, most of them adopt a single-core structure when the core cross-section is large, and the laying method is to directly ground the metal sheath and armor layer at both ends. The armor layer will generate an induced voltage to generate a circulating current with a value close to the core current. Therefore, in order to avoid the temperature rise caused by the current at the armor grounding point and then cause the submarine cable insulation layer to break down, it is very important to increase the armor current conduction performance and reduce the heat generation.

[0003] At present, there are mostly two types of grounding methods for submarine cable armor, namely the "hoop-copper braid" fixed grounding method and the anchor device fixed grounding method. The "hoop-copper braid" fixed grounding uses a hoop to tighten and evenly wrap the copper braid on the armored steel wire, and uses the copper braid for grounding. This method has the problem that the contact surface between the copper braid and the submarine cable armor cannot be tightly fitted, and the grounding copper braid is prone to structural damage, resulting in poor conduction performance. The anchor device fixed grounding uses a crimping connector to ensure that the armored steel wires are not crossed and the internal metal inner cone outer layer is evenly distributed. This method has the problem that the contact area between the armor layer and the inner cone is small, and it is easy to loosen under thermal expansion and contraction. Utility Model Content

[0004] The utility model provides a high-voltage submarine cable land end grounding device, which is optimized in terms of increasing the contact area, reducing the contact resistance and enhancing the contact reliability, so as to avoid abnormal temperature increase at the armored grounding point and reduce the risk of submarine cable insulation breakdown.

[0005] The technical solution adopted by the utility model is a high-voltage submarine cable land end grounding device, comprising a submarine cable end and a grounding buckle, wherein the metal conductor of the submarine cable end is electrically connected to the grounding buckle;

[0006] The grounding clip comprises a cylindrical armor clamp and a copper belt, the copper belt is wrapped around the metal conductor surface of the submarine cable end, the armor clamp is sleeved on the copper belt and is in tight contact with the copper belt;

[0007] The armored clamp is a metal clamp, and the armored clamp is connected to a grounding box through a wire.

[0008] Optimally, the above-mentioned high-voltage submarine cable land end grounding device, the armor clamp includes two fastening parts, and the fastening part includes a fastener and a semi-cylindrical semi-cylindrical cavity;

[0009] The semi-cylindrical cavities of the two fastening parts are butted together to form a cylindrical shape, and the semi-cylindrical cavities of the two fastening parts are relatively fixed by fasteners.

[0010] Optimally, in the above-mentioned high-voltage submarine cable land end grounding device, the fasteners include ear plates constructed on both sides of the semi-cylindrical cavity, and the fasteners of the semi-cylindrical cavities of the two fastening parts are butted and fixedly connected by bolts.

[0011] Optimized, in the above-mentioned grounding device at the land end of the high-voltage submarine cable, after one of the bolts connected by the fastener presses the conductor against the surface of the fastener, the fastener is electrically connected to the grounding box.

[0012] Optimally, the above-mentioned high-voltage submarine cable land end grounding device has a groove constructed on the copper belt, and the groove surface of the copper belt is roughened;

[0013] The groove of the copper tape is matched with the steel wire of the armor layer at the end of the submarine cable.

[0014] Optimized, in the above-mentioned grounding device for the land end of the high-voltage submarine cable, the copper tape is wrapped around the metal conductor surface of the submarine cable end and is tightly pressed and contacted with the metal conductor surface of the submarine cable end through the grounding buckle.

[0015] Optimized, the above-mentioned high-voltage submarine cable land end grounding device, the submarine cable end is connected with an anchor buckle, and the anchor buckle is composed of two semi-ring-shaped buckle components connected to form a ring and fixed by bolts.

[0016] The advantages of the present application are: the grounding device of the land end of the submarine cable of the present application, in the application of actual engineering, is achieved by evenly fastening the armored steel wire in the semicircular grooves inside the two copper sheets, and then fixing the two by an armored clamp. This device increases the contact area while avoiding the problem of loose contact on site due to thermal expansion and contraction, greatly reducing the impact of poor diversion effect on the life of the submarine cable. At the same time, the grounding device is separated from the anchoring device, so that the anchoring device does not need to be removed during its regular replacement, which greatly reduces the complexity of the replacement procedure and saves a lot of manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the armored clamp of the present application;

[0018] Figure 2 for Figure 1 A radial cross-sectional view of

[0019] Figure 3 This is a schematic diagram of the installation structure of the land-end grounding device of the high-voltage submarine cable of the present application. DETAILED DESCRIPTION

[0020] The technical features of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] As shown in the figure, the utility model is a high-voltage submarine cable land end grounding device, comprising a submarine cable end 1 and a grounding buckle, and the metal conductor of the submarine cable end 1 is electrically connected to the grounding buckle.

[0022] In the present application, the grounding clip includes a cylindrical armor clamp and a copper tape 3, the copper tape 3 is wrapped around the metal conductor surface of the submarine cable end 1, the armor clamp is sleeved on the copper tape 3 and is in tight contact with the copper tape 3, the copper tape 3 is pressed against the metal conductor of the submarine cable end 1 by the armor clamp, and the armor clamp is electrically connected to the metal conductor of the submarine cable end 1 by the copper tape 3. The copper tape 3 is wrapped around the metal conductor surface of the submarine cable end 1 and is in tight contact with the metal conductor surface of the submarine cable end 1 through the grounding clip.

[0023] The armor clamp is a metal clamp. After the armor clamp is electrically connected to the metal conductor of the submarine cable end 1, the armor clamp is connected to the grounding box through a wire, so that the metal conductor of the submarine cable end 1 is grounded through the armor clamp and the wire.

[0024] In this embodiment, the armor clamp includes two fastening parts, the fastening parts include a fastener 202 and a semi-cylindrical cavity 201, the semi-cylindrical cavities 201 of the two fastening parts are connected to form a cylindrical shape, and the semi-cylindrical cavities 201 of the two fastening parts are relatively fixed by the fastener 202.

[0025] The fasteners 202 are ear plates constructed on both sides of the semi-cylindrical cavity 201 , and the fasteners 202 of the semi-cylindrical cavities 201 of the two fastening parts are butted and fixedly connected by bolts.

[0026] After the ear plates of the fastener 202 of the two fastening parts are fixed by bolts, the wire is connected to one of the bolts. After the bolt presses the wire against the surface of the fastener 202, the fastener 202 is electrically connected to the grounding box.

[0027] Grooves are constructed on the copper belt 3 . The surface of the copper belt 3 has grooves of the same diameter as the steel wires of the armor layer of the submarine cable end 1 and is roughened. The grooves of the copper belt 3 are arranged in coordination with the steel wires of the armor layer of the submarine cable end 1 .

[0028] The submarine cable end 1 is connected to an anchor buckle 4, which is composed of two semi-ring-shaped buckle components butted together to form a ring and fixed by bolts.

[0029] During the construction operation, the PP rope of the submarine cable end 1 is stripped, and the armor surface of the submarine cable end 1 is cleaned with asphalt cleaning agent, and the armor layer steel wire of the submarine cable end 1 is evenly distributed in the grooves of the two copper strips 3. Then, the armor clamp is fixed to the surface of the copper strip 3 using the fastener 202. The fastener 202 is matched with the copper nose to connect the grounding wire conductor, and one end of the grounding wire conductor is grounded. Anchor buckle 4 is placed behind the grounding device to fix the movement of the land end submarine cable.

[0030] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A high-voltage submarine cable land end grounding device, comprising a submarine cable end (1) and a grounding buckle, wherein the metal conductor of the submarine cable end (1) is electrically connected to the grounding buckle; characterized in that: The grounding clip comprises a cylindrical armor clamp and a copper strip (3), the copper strip (3) is wrapped around the metal conductor surface of the submarine cable end (1), the armor clamp is sleeved on the copper strip (3) and is in tight contact with the copper strip (3); The armored clamp is a metal clamp, and the armored clamp is connected to a grounding box through a wire.

2. The high-voltage submarine cable land end grounding device according to claim 1, characterized in that: The armor clamp comprises two fastening parts, wherein the fastening parts comprise a fastener (202) and a semi-cylindrical semi-cylindrical cavity (201); The semi-cylindrical cavities (201) of the two fastening parts are butted together to form a cylindrical shape, and the semi-cylindrical cavities (201) of the two fastening parts are relatively fixed by a fastener (202).

3. The high-voltage submarine cable land end grounding device according to claim 2 is characterized in that: The fastener (202) comprises ear plates constructed on both sides of the semi-cylindrical cavity (201), and the fasteners (202) of the semi-cylindrical cavities (201) of the two fastening parts are butted and fixedly connected by bolts.

4. The high-voltage submarine cable land end grounding device according to claim 3 is characterized in that: After one of the bolts connected to the fastener (202) presses the wire against the surface of the fastener (202), the fastener (202) is electrically connected to the grounding box.

5. The high-voltage submarine cable land end grounding device according to claim 1, characterized in that: The copper strip (3) is provided with grooves, and the surface of the grooves of the copper strip (3) is roughened; The groove of the copper strip (3) is arranged in coordination with the steel wire of the armor layer of the submarine cable end (1).

6. The high-voltage submarine cable land end grounding device according to claim 1, characterized in that: The copper tape (3) is wrapped around the metal conductor surface of the submarine cable end (1) and is pressed into tight contact with the metal conductor surface of the submarine cable end (1) via a grounding buckle.

7. The high-voltage submarine cable land end grounding device according to claim 1, characterized in that: The submarine cable end (1) is connected to an anchor buckle (4), which is formed by two semi-ring-shaped buckle assemblies butted together to form a ring and fixed by bolts.

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