A medium-voltage cross-linked polyethylene power cable that is easy to connect

Abstract

This invention relates to the field of power cable technology and proposes a medium-voltage cross-linked polyethylene power cable that facilitates connection. The cable includes a cutting groove, support bars, and positioning grooves. Multiple cutting grooves are formed on the outer sheath near the cable cores. Multiple cable cores are arranged circumferentially inside the outer sheath. The cutting grooves are positioned between two adjacent cable cores. Multiple support bars are circumferentially fixed to the outer sheath near the cable cores. Each cutting groove has a support bar on both sides, which supports the filler material near the cutting groove. The support bars are protruding on the inner side of the outer sheath. Multiple positioning grooves are formed on the outer sheath away from the cable cores, corresponding to the positions of the support bars. The cutting grooves are located between two adjacent positioning grooves. This technical solution addresses the problems of conductor damage and low connection strength in existing medium-voltage cable connections.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, and more specifically, to a medium-voltage cross-linked polyethylene power cable that is easy to connect. Background Technology

[0002] Power cables are the carriers for power transmission in the power grid. When transmitting power over long distances, the length of a single cable is often insufficient, requiring cable connections. Modern medium-voltage cables mostly adopt a composite structure, consisting of multiple layers from the inside out, including conductor, main insulation layer, filler, metal shielding layer, armor layer, and outer sheath. Each layer needs to be peeled off before the conductors are connected.

[0003] In existing technologies, when connecting cables, because the multi-layered structure is kept in close contact, the depth and location of the cut can usually only be judged by the experience of the workers when stripping the outer layer. When connecting conductors, only a short section of the main insulation layer wrapped on the conductor is usually broken. However, when the construction workers cut the outer layer, they are very likely to scratch the main insulation layer and the conductor surface, resulting in hidden damage near the interface. At the same time, since the connection of the cable core is usually clamped and fixed by wire clamps, the mechanical strength is weaker than that of directly connected conductors. Connecting multiple conductors at the same cross section will cause uneven stress on the cable at the connection point. When bending, the stress is concentrated at the cross section of the conductor, and the overall tensile strength of the cable will also be reduced. Therefore, there is a need for a cable structure that can accurately strip the outer layer and achieve stepped connection when connecting. Summary of the Invention

[0004] This invention proposes a medium-voltage cross-linked polyethylene power cable that is easy to connect, in order to solve the problems of conductor damage and low connection strength in the connection of medium-voltage cables in the prior art.

[0005] The technical solution of the present invention is as follows: A medium-voltage cross-linked polyethylene power cable for easy connection includes multiple cable cores, filler, and an outer sheath. The outer sheath is fitted over the filler and the multiple cable cores. It also includes easy-cut grooves, support bars, and positioning grooves. Multiple easy-cut grooves are formed on the outer sheath near the cable cores. The multiple cable cores are arranged circumferentially inside the outer sheath. Each easy-cut groove is located between two adjacent cable cores. Multiple support bars are circumferentially fixed to the outer sheath near the cable cores. Each easy-cut groove has a support bar on each side. The support bars can support the filler near the easy-cut groove. The support bar is raised on the inner side of the outer sheath. Multiple positioning grooves are formed on the outer sheath away from the cable core. The positioning grooves correspond to the positions of the support bars. The easy-cut groove is located between two adjacent positioning grooves. In this application, there are three cable cores, and correspondingly, three easy-cut grooves, six support bars, and six positioning grooves are provided. The staggered arrangement of the easy-cut grooves and the cable cores can avoid cutting the cable cores and the insulation layer on the cable cores when cutting the outer sheath. Furthermore, the position of the cable cores can be determined outside the outer sheath, and individual cable cores can be connected separately, thereby enabling stepped connections.

[0006] The filler is provided with multiple insulating partitions, which are arc-shaped. Each insulating partition wraps around one of the cable cores, making each cable core independent of the others inside the outer sheath. In this application, two insulating partitions are provided, which can divide the inside of the outer sheath into three areas, thereby making the three cable cores independent. After each cable core is connected, the other two cable cores can be waterproofed and separated.

[0007] The space between two adjacent cable cores is filled with filler material. Cutting is performed between the two adjacent positioning slots, which can cut the slot position on the outer sheath. During the cutting, the filler material between the two adjacent cable cores can be cut.

[0008] Cut along the axial direction of the cable core at two adjacent slotted locations, and make a split opening in the outer sheath between the two cut locations. After cutting along the cable on both sides, cut the center of the outer sheath between the cut locations to form an H-shaped cut. The opening position on the outer sheath corresponds to one of the cable cores. There are two strip-shaped outer sheaths at the cut, named the covering protective strip. After the cable cores are connected at the opening of the outer sheath, the covering protective strip can be used to cover them. After covering, there is an H-shaped gap at the connection of the cable cores.

[0009] After opening the outer sheath, the cable cores at the corresponding positions can be cut and connected. Different cable cores can be cut and connected at different positions in the axial direction of the outer sheath to achieve the connection of two cables.

[0010] A medium-voltage cross-linked polyethylene power cable that is easy to connect further includes a filling sealing plate and a pre-made sealing sleeve. The filling sealing plate is detachably disposed at an opening on the outer sheath. The filling sealing plate is provided with a filling strip corresponding to the cut gap on the outer sheath. The filling strip is configured in an H-shape to fill the H-shaped gap. A waterproof tape is wrapped around the outer sheath and the filling sealing plate. The pre-made sealing sleeve is fitted onto the outer sheath, and the two ends of the waterproof tape are respectively fitted with the pre-made sealing sleeve.

[0011] The working principle and beneficial effects of this invention are as follows: 1. In this invention, by setting positioning grooves, the position between the two inner cable cores can be directly determined from the outside of the outer sheath. By cutting between the positioning grooves, the easy-cut groove can be accurately cut. The outer sheath at the easy-cut groove position is thinner, which facilitates cutting. At the same time, the cutting tool will extend between the two cable cores during cutting, reducing the possibility of the cable cores being cut and damaged. Compared with traditional cables, it is difficult to estimate the internal conductor layout when cutting, and the cutting depth can only be judged by experience to avoid cutting the conductor. In this application, the conductor is less likely to be cut. 2. In this invention, the gap between cable cores can be determined by setting positioning grooves. The outer sheath covering a cable core can be cut open, allowing for targeted operation on a specific cable core. The three cable cores can be cut at different positions and then connected to the conductor in another cable to achieve a stepped connection of multiple cable cores. This prevents the diameter of the cable connection from being too large and prevents heat from accumulating at the connection. At the location where one cable core is connected, the other cable cores are not cut and can bear weight, avoiding the reduction of the overall mechanical strength of the cable when all cable cores are cut at the same position. Attached Figure Description

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure from another perspective in this invention; Figure 3 This is a schematic diagram of the structure of the outer sheath and the prefabricated sealing sleeve in this invention. Figure 4 This is a schematic diagram of the structure of the cable and the protective strip at the connection position of the cable core in this invention; Figure 5This is a schematic diagram of the internal cross-sectional structure of the filling sealing plate and the covering protective strip in this invention; Figure 6 This is a schematic diagram of the structure in which the filling sealing plate and the cable core cooperate in this invention.

[0014] In the diagram: 1. Cable core; 2. Filler; 3. Outer sheath; 4. Cut-out groove; 5. Support strip; 6. Positioning groove; 7. Insulation partition; 8. Covering protective strip; 101. Filler sealing plate; 102. Filler strip; 103. Waterproof tape; 104. Prefabricated sealing sleeve. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0016] This embodiment proposes a medium-voltage cross-linked polyethylene power cable that is easy to connect, including multiple cable cores 1, filler 2, and an outer sheath 3. The outer sheath 3 is fitted over the filler 2 and the multiple cable cores 1, such as... Figures 1-3 As shown, it also includes a cutting groove 4, support bars 5, and positioning groove 6. Multiple cutting grooves 4 are formed on the outer sheath 3 near the cable core 1. Multiple cable cores 1 are arranged circumferentially inside the outer sheath 3. The cutting groove 4 is positioned between two adjacent cable cores 1. Multiple support bars 5 are circumferentially fixedly connected to the outer sheath 3 near the cable core 1. Each cutting groove 4 has a support bar 5 on both sides. The support bars 5 support the filler material 2 near the cutting groove 4. The support bars 5 are protruding on the inner side of the outer sheath 3. The support bars 5 on both sides of the cutting groove 4 are used to squeeze the filler material 2 when the outer sheath 3 is extruded, preventing excessive filler material 2 from being squeezed into the cutting groove 4, thus increasing the cutting difficulty. Multiple positioning slots 6 are formed on the outer sheath 3 on the side away from the cable core 1. The positioning slots 6 correspond to the positions of the support bars 5. The setting of the support bars 5 makes the outer sheath 3 thicker at this point. The positioning slots 6 here will not affect the structural strength of the easy-cut slots 4. The easy-cut slots 4 are located between two adjacent positioning slots 6. In this application, there are three cable cores 1, and correspondingly, there are three easy-cut slots 4, six support bars 5 and six positioning slots 6. The staggered arrangement of the easy-cut slots 4 and the cable cores 1 can avoid cutting the cable cores 1 and the insulation layer on the cable cores 1 when cutting the outer sheath 3. Moreover, the position of the cable cores 1 can be determined outside the outer sheath 3, and individual cable cores 1 can be connected separately, thereby enabling stepped connections.

[0017] The filler 2 is provided with multiple insulating partitions 7, such as Figures 2-3 As shown, the insulating partition 7 is set in an arc shape, and each insulating partition 7 wraps one of the cable cores 1, so that each cable core 1 inside the outer sheath 3 is independent of each other. In this application, two insulating partitions 7 are set, which can divide the inside of the outer sheath 3 into three areas, thereby making the three cable cores 1 independent. After each cable core 1 is connected, the other two cable cores 1 can be waterproofed and separated. When multiple cable cores 1 are set, the insulating partitions 7 can be set at intervals, as long as they can achieve the effect of dividing the inside.

[0018] The space between two adjacent cable cores 1 is filled with filler material 2. Cutting is made between the two adjacent positioning slots 6, allowing cutting to be performed at the location of the easy-cut slot 4 on the outer sheath 3. Figure 3 As shown, the cutting tool can cut the filler 2 between two adjacent cable cores 1. The operator does not need to consider the cutting depth when cutting. The tool can pass through the outer sheath 3 and the filler 2 in one go without damaging the conductor. The outer sheath 3, which is composed of multiple layers, can also be cut in one go.

[0019] like Figure 4 As shown, two adjacent slots 4 are cut along the axial direction of the cable core 1, and the outer sheath 3 between the two cut positions is divided and opened. After cutting along the cable on both sides, the center of the outer sheath 3 between the cut positions is cut to form an H-shaped cut. The opening position on the outer sheath 3 corresponds to one of the cable cores 1. There are two strip-shaped outer sheaths 3 at the cut, named the covering protective strip 8. After the cable core 1 is connected at the opening of the outer sheath 3, the covering protective strip 8 can be used to cover it. After covering, there is an H-shaped gap at the connection of the cable core 1.

[0020] After opening the outer sheath 3, the corresponding cable core 1 can be cut and connected, such as... Figure 1 As shown, different cable cores 1 can be cut and connected at different positions in the axial direction of the outer sheath 3 to achieve the connection of two cables. The three cable cores 1 are at different positions. By using the cutting groove 4 and positioning groove 6 to connect the cable cores 1 in a targeted manner, the connection of different cable cores 1 can be carried out in stages. When one cable core 1 is connected, the other two cable cores 1 are not cut, and the conductor connection position is separated, which can improve the strength of the cable and avoid the stress accumulation at the conductor connection position when the cable is bent, thereby dispersing the stress.

[0021] A type of easy-to-connect medium-voltage cross-linked polyethylene power cable, such as Figures 4-6As shown, it also includes a filling sealing plate 101 and a prefabricated sealing sleeve 104. The filling sealing plate 101 is detachably disposed at the opening position on the outer sheath 3. The filling sealing plate 101 is provided with a filling strip 102 corresponding to the cut gap on the outer sheath 3. The filling strip 102 is set in an H-shape to fill the H-shaped gap. The filling sealing plate 101 is set in an arc shape to press and seal the cut opening position on the outer sheath 3 with the filling strip 102. Figure 6 The cable core 1 marked with a number is the connection point of two cables. The diameter of the connection point increases. A waterproof tape 103 is wrapped around the outer sheath 3 and the filling sealing plate 101. The waterproof tape 103 improves the sealing performance. A prefabricated sealing sleeve 104 is fitted on the outer sheath 3. The two ends of the waterproof tape 103 are respectively fitted with prefabricated sealing sleeves 104 to seal any gaps that may exist at the two ends of the waterproof tape 103, reducing the risk of cracking at both ends of the waterproof tape 103.

[0022] In this embodiment, when connecting two cables, three positions can be selected to cut between the two positioning slots 6 without cutting the cable core 1. An opening is made in the outer sheath 3 to cut the cable core 1. After removing one end of the cut cable core 1, the cable core 1 to be connected is inserted. After connecting the two cable cores 1, the protective cover strip 8 is covered, and the connection position is sealed in sequence using the filling sealing plate 101, the waterproof tape 103, and the prefabricated sealing sleeve 104.

[0023] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A medium-voltage cross-linked polyethylene power cable for easy connection, comprising multiple cable cores (1), filler (2), and an outer sheath (3), wherein the outer sheath (3) is sleeved on the filler (2) and the multiple cable cores (1), characterized in that, Also includes: Multiple cut slots (4) are provided on the outer sheath (3) near the cable core (1). Multiple cable cores (1) are arranged in a circular pattern inside the outer sheath (3). The cut slots (4) are provided between two adjacent cable cores (1). Multiple support bars (5) are circumferentially fixedly connected to the outer sheath (3) on the side near the cable core (1). Each of the cut grooves (4) has a support bar (5) on both sides. The support bars (5) can support the filler (2) near the cut groove (4). The support bar (5) is protruding on the inner side of the outer sheath (3); Multiple positioning slots (6) are provided on the outer sheath (3) away from the cable core (1). The positioning slots (6) correspond to the positions of the support bar (5). The cut groove (4) is located between two adjacent positioning slots (6).

2. The medium-voltage cross-linked polyethylene power cable for easy connection according to claim 1, characterized in that, The filler (2) is provided with a plurality of insulating partitions (7), which are arranged in an arc shape. Each insulating partition (7) wraps one of the cable cores (1), so that each cable core (1) is independent of each other inside the outer sheath (3).

3. A medium-voltage cross-linked polyethylene power cable for easy connection according to claim 2, wherein a filler (2) is filled between two adjacent cable cores (1), characterized in that, Cutting can be performed between two adjacent positioning slots (6), and the cutting slot (4) on the outer sheath (3) can be cut. During cutting, the filler (2) between two adjacent cable cores (1) can be cut.

4. A medium-voltage cross-linked polyethylene power cable for easy connection according to claim 3, characterized in that, Cut along the axial direction of the cable core (1) at two adjacent cut slots (4) and make a split opening in the outer sheath (3) between the two cut positions. The opening position on the outer sheath (3) corresponds to one of the cable cores (1).

5. A medium-voltage cross-linked polyethylene power cable for easy connection according to claim 4, characterized in that, After opening the outer sheath (3), the corresponding cable core (1) can be cut and connected. Different cable cores (1) can be cut and connected at different positions in the axial direction of the outer sheath (3) to realize the connection of two cables.

6. A medium-voltage cross-linked polyethylene power cable for easy connection according to claim 5, characterized in that, Also includes: A filling sealing plate (101) is detachably disposed at the opening position on the outer sheath (3), and a filling strip (102) is provided on the filling sealing plate (101) corresponding to the cutting gap on the outer sheath (3). Waterproof tape (103) is wrapped around the outer sheath (3) and the filling sealing plate (101). A prefabricated sealing sleeve (104) is fitted onto the outer sheath (3), and the two ends of the waterproof strip (103) are respectively fitted with prefabricated sealing sleeves (104).

Images