Environment-friendly nuclear power high-voltage power cable

Abstract

This invention discloses an environmentally friendly nuclear power high-voltage cable, comprising a cable body, which, from the inside out, consists of: a conductor, a semi-conductive shielding layer, an insulation layer, a filling layer, a wrapping layer, a waterproof layer, an armor layer, and an outer sheath. The semi-conductive shielding layer is made of low-smoke halogen-free cross-linked polyolefin semi-conductive material; the insulation layer is made of radiation-resistant low-smoke halogen-free cross-linked polyolefin composite material; the filling layer is made of low-smoke halogen-free polypropylene filling rope; and the wrapping layer is made of low-smoke halogen-free polypropylene and water-based butyl rubber composite material. By setting the semi-conductive shielding layer, it tightly covers the outside of the conductor. The low-smoke halogen-free cross-linked polyolefin semi-conductive material is used to uniformly conduct the electric field on the surface of the conductor core, prevent tip discharge, and bond firmly to the adjacent insulation layer. The insulation layer is made of radiation-resistant low-smoke halogen-free cross-linked polyolefin composite material. The setting of the filling layer, wrapping layer, and outer sheath improves the overall performance of the cable body while meeting its environmental protection requirements of being halogen-free, low-smoke, and low-toxicity.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, specifically to an environmentally friendly nuclear power high-voltage power cable. Background Technology

[0002] As an important clean energy base, the safety, reliability, and environmental performance of the internal power transmission system of nuclear power plants are of paramount importance. Because it can effectively avoid the release of toxic and corrosive halogen acid gases and minimize smoke generation under accident conditions such as fire, it has become the preferred cable for the construction of nuclear power units in modern nuclear power plants. In nuclear power plants, a large number of power cables need to be laid through cable trenches, tunnels, or cable tray systems to connect the reactor building, turbine building, electrical building, and various auxiliary facilities.

[0003] Existing nuclear power high-voltage cables need to have good environmental performance. They need to ensure the functional integrity of the safety system (corrosion prevention and power supply) under extreme accidents, and in the event of a fire, they need to have low smoke and low toxicity characteristics to protect human lives. They also need to fulfill their environmental responsibilities throughout the entire life cycle from construction and operation to decommissioning. Therefore, the environmental performance of nuclear power high-voltage cables is particularly important. Summary of the Invention

[0004] The purpose of this invention is to provide an environmentally friendly nuclear power high-voltage power cable to overcome the above-mentioned shortcomings in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An environmentally friendly nuclear power high-voltage cable includes a cable body, which, from the inside out, comprises: a conductor, a semi-conductive shielding layer, an insulation layer, a filling layer, a wrapping layer, a waterproof layer, an armor layer, and an outer sheath. The semiconductive shielding layer is made of low-smoke, halogen-free cross-linked polyolefin semiconductive material; The insulating layer is made of a radiation-resistant, low-smoke, halogen-free cross-linked polyolefin composite material; The filling layer is a low-smoke, halogen-free polypropylene filled rope; The wrapping layer is made of a low-smoke halogen-free polypropylene and water-based butyl rubber composite material; The outer sheath is made of radiation-resistant, low-smoke, halogen-free cross-linked polyolefin sheath material; It also includes mounting components for securing the cable body to a bracket within the cable trench.

[0006] Preferably, the installation assembly includes an installation ring sleeved on the cable body, a fixing post fixedly disposed on the installation ring, a clamping member slidably disposed on the fixing post, a limiting groove disposed on the clamping member, and a limiting piece fixedly disposed on the outer sheath, the limiting piece engaging with the limiting groove.

[0007] Preferably, a first spring is provided between the clamping member and the mounting ring, and the two ends of the first spring are fixedly connected to the clamping member and the mounting ring, respectively.

[0008] Preferably, it also includes a correction component, the correction component including a lifting plate slidably disposed on a mounting ring, a rotating rod rotatably disposed on the lifting plate, a central column fixedly disposed on the mounting ring, a trapezoidal block fixedly disposed on the rotating rod, and a plurality of friction plates disposed on the trapezoidal block, the friction plates rubbing against the central column.

[0009] Preferably, a vertical rod is slidably mounted on the mounting ring, and a long groove is provided on the vertical rod. A long rod is fixedly mounted on the rotating rod, and the long rod is slidably mounted in the long groove.

[0010] Preferably, a second spring is provided between the vertical rod and the mounting ring, and the two ends of the second spring are fixedly connected to the vertical rod and the mounting ring, respectively.

[0011] Preferably, an arc-shaped plate is slidably disposed on the mounting ring, the arc-shaped plate is fixedly connected to the clamping member, and a connecting rope is disposed between the arc-shaped plate and the vertical rod, with the two ends of the connecting rope being fixedly connected to the arc-shaped plate and the vertical rod respectively.

[0012] Preferably, a support base is fixedly provided on the mounting ring, a locking rod is slidably provided on the support base, a slot is provided on the locking rod, and the bottom of the clamping member is engaged with the slot.

[0013] Preferably, a third spring is provided between the locking rod and the support base, and the two ends of the third spring are fixedly connected to the locking rod and the support base respectively.

[0014] Preferably, a bolt is fixedly installed on the locking rod, and a nut is threaded onto the bolt.

[0015] In the above technical solution, the environmentally friendly nuclear power high-voltage power cable provided by the present invention has the following beneficial effects: By setting a semiconductive shielding layer that tightly wraps around the outside of the conductor, the low-smoke halogen-free cross-linked polyolefin semiconductive material is used to uniformly conduct the electric field on the surface of the conductor core, prevent tip discharge, and bond firmly to the adjacent insulation layer. The insulation layer is a radiation-resistant, low-smoke, halogen-free cross-linked polyolefin composite material. The addition of a filler layer, a wrapping layer, and an outer sheath enhances the overall performance of the cable while meeting its requirements for being halogen-free, low-smoke, and low-toxicity.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0017] This application provides an overview of various implementations or examples of the technology described in this disclosure, but is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 A cross-sectional view of the cable body provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure provided for an embodiment of the present invention; Figure 3 A cross-sectional view of the mounting ring provided in an embodiment of the present invention; Figure 4 Provided for embodiments of the present invention Figure 3 Enlarged view of point A in the image; Figure 5 This is a schematic diagram of the corrective component structure provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the clamping member structure provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the mounting ring structure provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the vertical rod structure provided in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Cable body; 11. Conductor; 12. Semi-conductive shielding layer; 13. Insulation layer; 14. Filling layer; 15. Wrapping tape layer; 16. Waterproof layer; 17. Armor layer; 18. Outer sheath; 19. Limiting plate; 2. Mounting ring; 21. Intermediate post; 22. Fixing post; 23. Support base; 3. Clamping component; 31. First spring; 32. Arc plate; 33. Connecting rope; 34. Limiting groove; 4. Lifting plate; 41. Rotating rod; 42. Trapezoidal block; 43. Friction plate; 44. Long rod; 5. Vertical rod; 51. Long groove; 52. Second spring; 6. Locking rod; 61. Slot; 62. Third spring; 63. Bolt; 7. Nut. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0022] Please refer to 1-8. An environmentally friendly nuclear power high-voltage cable includes a cable body 1, which, from the inside out, consists of: a conductor 11, a semi-conductive shielding layer 12, an insulation layer 13, a filling layer 14, a wrapping layer 15, a waterproof layer 16, an armor layer 17, and an outer sheath 18. The semiconductive shielding layer 12 is made of environmentally friendly low-smoke halogen-free cross-linked polyolefin semiconductive material. It tightly covers the outside of the conductor 11 and is made of low-smoke halogen-free cross-linked polyolefin semiconductive material. It uniformly forms the surface electric field of the conductor 11 and prevents tip discharge. The insulation layer 13 is made of radiation-resistant, low-smoke, halogen-free cross-linked polyolefin composite material and is wrapped around the outside of the semi-conductive shielding layer 12. The material is radiation-resistant, low-smoke, halogen-free cross-linked polyolefin composite material, which has excellent high voltage resistance and radiation resistance, and is the key to the cable body 1's ability to withstand high voltage. The filler layer 14 is a low-smoke halogen-free polypropylene filler rope, which fills the space between the wrapping layer 15 and the insulation layer 13 of each conductor 11, as well as between the insulation layer 13 of each conductor 11. The material is low-smoke halogen-free polypropylene filler rope, which is densely filled and used to fix the position of the conductor 11 and buffer mechanical vibration. It is also halogen-free, recyclable and environmentally friendly. The wrapping layer 15 is made of low-smoke halogen-free polypropylene and water-based butyl rubber composite material, which tightly wraps the outside of the filler layer 14. The material is low-smoke halogen-free polyester non-woven fabric. It is used to bind the conductor 11 and the filler layer 14, so that the internal structure forms a whole. It can prevent the conductor from shifting during the laying process, and also has radiation resistance and corrosion resistance. The outer sheath 18 is made of radiation-resistant, low-smoke, halogen-free cross-linked polyolefin sheath material, which is the outermost layer of the cable body 1. The material is radiation-resistant, low-smoke, halogen-free cross-linked polyolefin sheath material, which has the effects of radiation resistance, high temperature resistance, wear resistance and flame retardancy. The armor layer 17 is made of aluminum-magnesium-silicon alloy, which has the dual functions of mechanical protection and electromagnetic shielding. It has excellent tensile strength and elongation, is lightweight and free of heavy metal pollution. Waterproof layer 16: It is wrapped around the outside of the wrapping layer 15 using an extrusion molding process. The material is a low-smoke halogen-free polypropylene and water-based butyl rubber composite material, which is extruded by a special extruder head. It has both the function of buffering mechanical impact and full-section waterproofing. By setting the semi-conductive shielding layer 12, insulation layer 13, filling layer 14, wrapping layer 15, waterproof layer 16, armor layer 17 and outer sheath 18, the comprehensive performance of the cable body 1 in terms of radiation resistance, high temperature resistance and wear resistance is improved, while meeting the requirements of halogen-free, low smoke and low toxicity environmental protection.

[0023] It also includes an installation component, which is used to fix the cable body 1 on the bracket in the cable trench. The installation component is used to install the cable body 1 on the bracket in the cable trench, thereby improving the stability of the cable body 1 after installation.

[0024] Specifically, the installation components include an installation ring 2 fitted over the cable body 1, a fixing post 22 fixedly mounted on the installation ring 2, a clamping member 3 slidably mounted on the fixing post 22, a limiting groove 34 provided on the clamping member 3, and a limiting piece 19 fixedly mounted on the outer sheath 18. The limiting piece 19 engages with the limiting groove 34. By setting the clamping members 3 on both sides of the installation ring 2, the cable body 1 is clamped, so that the cable body 1 is located in the middle position of the installation ring 2, preventing the outer sheath 18 of the cable body 1 from being in contact with the installation ring 2 for a long time, which would cause squeezing and easy accumulation of water and dust at the contact point, and corrosion at the contact point over time. At the same time, the cable body 1 is limited by the cooperation between the limiting groove 34 and the limiting piece 19 on the clamping member 3, preventing the cable body 1 from sliding and deviating. The limiting piece 19 is welded to the outer sheath 18 of the cable body 1 by hot melt welding.

[0025] In a further embodiment of the present invention, a first spring 31 is provided between the clamping member 3 and the mounting ring 2. The two ends of the first spring 31 are fixedly connected to the clamping member 3 and the mounting ring 2 respectively. Through the elastic force of the first spring 31, the clamping members 3 on both sides of the cable body 1 clamp the cable body 1. And through the clamping member 3, the cable body 1 is positioned in the middle of the mounting ring 2, so that the outer sheath 18 of the cable body 1 does not contact the inner wall of the mounting ring 2, avoiding the accumulation of dust at the contact position, and preventing the dust from absorbing water and being difficult to evaporate when it rains, which can lead to corrosion at the joint over a long period of time.

[0026] Furthermore, it also includes a correction component, which includes a lifting plate 4 slidably mounted on the mounting ring 2. A rotating rod 41 is rotatably mounted on the lifting plate 4. A central column 21 is fixedly mounted on the mounting ring 2. A trapezoidal block 42 is fixedly mounted on the rotating rod 41. Multiple friction plates 43 are mounted on the trapezoidal block 42. The friction plates 43 rub against the central column 21. When the cable body 1 is subjected to an external force and shifts to one side of the mounting ring 2, the clamping member 3 on that side is subjected to force, and the same side end of the rotating rod 41 is subjected to a downward force. The rotating rod 41 rotates on the lifting plate 4. When rotating, the friction plates 43 on the trapezoidal blocks 42 on both sides of the rotating rod 41 abut against the two sides of the central column 21, thereby restricting the continued sliding of the clamping member 3, thus preventing the cable body 1 from moving to one side of the mounting ring 2 under force, which would cause the outer sheath 18 of the cable body 1 to have excessive contact and adhesion with the mounting ring 2.

[0027] Furthermore, a vertical rod 5 is slidably mounted on the mounting ring 2, and a long groove 51 is provided on the vertical rod 5. A long rod 44 is fixedly mounted on the rotating rod 41, and the long rod 44 is slidably mounted in the long groove 51. When the vertical rods 5 on both sides slide simultaneously, the long groove 51 and the long rod 44 can cooperate to drive the rotating rod 41 and the lifting plate 4 to slide. At this time, the rotating rod 41 will not rotate, and the trapezoidal block 42 will not abut against the middle column 21. If one of the vertical rods 5 slides under force, the rotating rod 41 will rotate, and the trapezoidal block 42 will abut against the middle column 21 through the friction plate 43 to limit the sliding of the lifting plate 4.

[0028] In a further embodiment of the present invention, a second spring 52 is provided between the vertical rod 5 and the mounting ring 2. The two ends of the second spring 52 are fixedly connected to the vertical rod 5 and the mounting ring 2 respectively. When the vertical rods 5 on both sides slide at the same time, the two second springs 52 are compressed at the same time. When the vertical rod 5 on one side slides, the second spring 52 on that side is compressed, and the vertical rod 5 on the other side will not slide under the action of the corresponding second spring 52, thereby causing the rotating rod 41 to rotate. This causes the trapezoidal block 42 on the rotating rod 41 to abut against the intermediate column 21 through the friction plate 43, thereby limiting the sliding of the lifting plate 4.

[0029] In the embodiment provided by the present invention, an arc-shaped plate 32 is slidably arranged on the mounting ring 2. The arc-shaped plate 32 is fixedly connected to the clamping member 3. A connecting rope 33 is provided between the arc-shaped plate 32 and the vertical rod 5. The two ends of the connecting rope 33 are fixedly connected to the arc-shaped plate 32 and the vertical rod 5 respectively. When the arc-shaped plate 32 slides with the clamping member 3, the vertical rod 5 slides by the pull of the connecting rope 33.

[0030] Specifically, a support base 23 is fixedly installed on the mounting ring 2, a locking rod 6 is slidably installed on the support base 23, and a slot 61 is provided on the locking rod 6. The bottom of the clamping member 3 is engaged with the slot 61. During the cable laying process, the clamping member 3 on the mounting ring 2 clamps the cable 1 to facilitate laying. After the cable 1 slides, the locking rod 6 slides and disengages from the slot 61. Under the action of the first spring 31, the clamping member 3 pops out, and the limiting groove 34 engages with the limiting member to clamp the cable 1.

[0031] In a further embodiment of the present invention, a third spring 62 is provided between the locking rod 6 and the support base 23. The two ends of the third spring 62 are fixedly connected to the locking rod 6 and the support base 23 respectively. A bolt 63 is fixedly provided on the locking rod 6, and a nut 7 is threaded on the bolt 63.

[0032] Working principle: When cable body 1 is laid in the cable trench, under the action of the third spring 62, the slot 61 engages with the bottom of the clamping member 3. At this time, the first spring 31 is in a stretched state, and the clamping member 3 does not clamp cable body 1, which facilitates the corresponding adjustment between the limiting piece 19 of cable body 1 and the cable trench support. After adjustment, cable body 1 is lifted, and the mounting ring 2 is slid between cable body 1 and the support, and the bolt 63 is inserted into the hole on the cable trench support. Then, the nut 7 is screwed onto the bolt 63 from below the cable trench support. During the screwing process, After the nut 7 abuts against the bracket, continued rotation will cause the bolt 63 to slide on the support seat 23 through the screwing force between the nut 7 and the bolt 63. When the bolt 63 slides, it can drive the locking rod 6 to slide and cause the third spring 62 to stretch. When the locking rod 6 slides, the slot 61 disengages from the bottom of the clamping member 3. After the nuts 7 on both sides are screwed onto the bolt 63, the two clamping members 3 clamp the cable body 1 under the action of the first spring 31, and cause the limiting groove 34 to engage with the limiting piece 19, thus completing the fixed installation between the cable and the cable trench bracket. During use, under the action of the first springs 31 on both sides, the two clamping parts 3 keep the cable body 1 in the middle position of the mounting ring 2. Under the influence of thermal expansion and contraction, if the cable body 1 expands, the clamping parts 3 will slide to both sides respectively. When the two clamping parts 3 drive the corresponding arc plate 32 to slide, the arc plate 32 pulls the vertical rod 5 to slide through the connecting rope 33. The vertical rods 5 on both sides slide at the same time, which will pull the rotating rod 41 and the lifting plate 4 to slide through the long groove 51 and the long rod 44, and compress the second spring 52. During this process, the cable body 1 will not be subjected to hard compression between the mounting ring 2 and the clamping parts 3 due to thermal expansion, which would cause the outer sheath 18 to deform or be damaged. At the same time, under the action of the first springs 31 on both sides, the cable body 1 is kept in the middle position of the mounting ring 2, which avoids the contact area between the cable body 1 and the mounting ring 2 being too large, which would cause water and dust to accumulate at the contact point after long-term use, making it prone to corrosion.

[0033] When the cable body 1 receives an external force and is about to shift to one side of the mounting ring 2, the cable body 1 applies pressure to the clamping member 3 on one side. The arc-shaped plate on one side pulls the connecting rope 33, causing the vertical rod 5 on that side to move downward, applying a downward force to the rotating rod 41 and the lifting plate 4. Since the clamping member 3 on the other side is not under pressure, the vertical rod 5 on that side will not move downward under the support of the second spring 52. This causes the rotating rod 41 to rotate slightly on the lifting plate 4. When the rotating rod 41 drives the trapezoidal block 42 to rotate, the friction plate 43 abuts against the intermediate column 21, restricting the sliding and rotation of the vertical rod 5 and preventing the arc-shaped plate 32 and the clamping member 3 from continuing to slide. This prevents the cable body 1 from shifting too much when subjected to external force, resulting in an excessively large contact area with the mounting ring 2, which leads to water and dust accumulation at the contact point and corrosion over time.

[0034] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An environmentally friendly nuclear power high-voltage power cable, comprising a cable body (1), characterized in that, The cable body (1) consists of, from the inside out: conductor (11), semi-conductive shielding layer (12), insulation layer (13), filling layer (14), wrapping layer (15), waterproof layer (16), armor layer (17), and outer sheath (18). The semiconductive shielding layer (12) is made of low-smoke halogen-free cross-linked polyolefin semiconductive material; The insulating layer (13) is made of radiation-resistant, low-smoke, halogen-free cross-linked polyolefin composite material; The filling layer (14) is a low-smoke halogen-free polypropylene filling rope; The wrapping layer (15) is made of a low-smoke halogen-free polypropylene and water-based butyl rubber composite material; The outer sheath (18) is made of radiation-resistant, low-smoke, halogen-free cross-linked polyolefin sheath material; It also includes mounting components for securing the cable body (1) to a bracket within the cable trench; The installation assembly includes an installation ring (2) sleeved on the outside of the cable body (1), a fixing post (22) fixedly installed on the installation ring (2), a clamping member (3) slidably installed on the fixing post (22), a limiting groove (34) provided on the clamping member (3), and a limiting piece (19) fixedly installed on the outer sheath (18), the limiting piece (19) engaging with the limiting groove (34); A first spring (31) is provided between the clamping member (3) and the mounting ring (2), and the two ends of the first spring (31) are fixedly connected to the clamping member (3) and the mounting ring (2) respectively. It also includes a correction component, which includes a lifting plate (4) slidably disposed on the mounting ring (2), a rotating rod (41) rotatably disposed on the lifting plate (4), a middle column (21) fixedly disposed on the mounting ring (2), a trapezoidal block (42) fixedly disposed on the rotating rod (41), and a plurality of friction plates (43) disposed on the trapezoidal block (42), the friction plates (43) rubbing against the middle column (21); A vertical rod (5) is slidably arranged on the mounting ring (2), and a long groove (51) is provided on the vertical rod (5). A long rod (44) is fixedly arranged on the rotating rod (41), and the long rod (44) is slidably arranged in the long groove (51). A second spring (52) is provided between the vertical rod (5) and the mounting ring (2), and the two ends of the second spring (52) are fixedly connected to the vertical rod (5) and the mounting ring (2) respectively; An arc-shaped plate (32) is slidably disposed on the mounting ring (2). The arc-shaped plate (32) is fixedly connected to the clamping member (3). A connecting rope (33) is provided between the arc-shaped plate (32) and the vertical rod (5). The two ends of the connecting rope (33) are fixedly connected to the arc-shaped plate (32) and the vertical rod (5) respectively. A support base (23) is fixedly provided on the mounting ring (2), a locking rod (6) is slidably provided on the support base (23), a slot (61) is provided on the locking rod (6), and the bottom of the clamping member (3) is engaged with the slot (61); A third spring (62) is provided between the locking rod (6) and the support base (23), and the two ends of the third spring (62) are fixedly connected to the locking rod (6) and the support base (23) respectively.

2. The environmentally friendly nuclear power high-voltage power cable according to claim 1, characterized in that, A bolt (63) is fixedly installed on the locking rod (6), and a nut (7) is threaded on the bolt (63).

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