Cathodic protection system for offshore photovoltaic pile foundations

Abstract

This utility model discloses a cathodic protection system for marine photovoltaic (PV) pile foundations, relating to the field of marine PV pile foundation technology. The cathodic protection system includes an auxiliary anode and a reference electrode, disposed on one side of the PV pile foundation, with the auxiliary anode and reference electrode spaced apart. The auxiliary anode includes an insulating sleeve and an anode body disposed inside the insulating sleeve. A composite cable is disposed on one side of the PV pile foundation, with one end electrically connected to a potentiostat and the other end conductively connected to both the auxiliary anode and the reference electrode. The composite cable includes a sheath and conductors inside the sheath, and has a through hole to expose the conductors. A conductive module is disposed inside the insulating sleeve and in contact with the anode body, conductively connected to the anode body. The conductive module is sleeved outside the sheath and passes through the through hole to conduct to the conductors. A counterweight is disposed at the end of the composite cable furthest from the pile foundation. The technical solution provided by this utility model achieves effective cathodic protection for PV pile foundations.

Description

Technical Field

[0001] This utility model relates to the field of marine photovoltaic pile foundation technology, and in particular to a cathodic protection system for marine photovoltaic pile foundations. Background Technology

[0002] Marine photovoltaic (PV) foundations are subject to severe corrosion in seawater and marine environments, leading to perforation and significantly impacting their structural safety. While anti-corrosion coatings are commonly used, their durability in the fully submerged and tidal zones declines annually. Without cathodic protection, safety is severely compromised. Currently, sacrificial anode protection is employed, connecting a more negatively charged, more reactive metal to the protected steel structure to form a galvanic cell. In this cell, the reactive metal, acting as the anode, preferentially corrodes, sacrificing itself to protect the steel structure (cathode) from corrosion. However, as the sacrificial anode protection period increases, the underwater PV foundations will gradually exceed the design life of the cathodic protection, necessitating timely replacement of the anode material, which is inconvenient. Utility Model Content

[0003] The main purpose of this invention is to propose a cathodic protection system for marine photovoltaic pile foundations, aiming to achieve effective cathodic protection for the pile foundations.

[0004] To achieve the above objectives, the present invention proposes a cathodic protection system for offshore photovoltaic pile foundations, which is applied to photovoltaic pile foundations. The cathodic protection system includes:

[0005] An auxiliary anode and a reference electrode are disposed on one side of the photovoltaic pile foundation, and the auxiliary anode and the reference electrode are spaced apart. The auxiliary anode includes an insulating sleeve and an anode body disposed inside the insulating sleeve.

[0006] A composite cable is provided on one side of the photovoltaic pile foundation. One end of the composite cable is electrically connected to a potentiostat, and the other end passes through the auxiliary anode and the reference electrode and is connected to the auxiliary anode and the reference electrode respectively. The composite cable includes a sheath and a conductor inside the sheath. The portion of the composite cable located inside the auxiliary anode has a through hole to expose the conductor.

[0007] A conductive module, disposed within the insulating sleeve and in contact with the anode body for electrical communication, is also sleeved outside the sheath and passes through the through hole to communicate with the wire; and

[0008] A counterweight is located at the end of the composite cable furthest from the pile foundation.

[0009] In one embodiment, the conductive module includes two conductive parts, each conductive part having an installation space and an inclined surface. The two conductive parts are staggered and the two inclined surfaces abut each other, so that the two conductive parts together form a cylindrical body with open ends. The composite cable is disposed in the installation space, and the outer periphery of the conductive part is in contact with the anode body.

[0010] In one embodiment, the insulating sleeve is open at both ends, and a first sealing plug is provided at each end of the insulating sleeve, and the composite cable passes through the two first sealing plugs in sequence.

[0011] In one embodiment, a first sealing filler is provided inside the insulating sleeve, the first sealing filler being used to fill and seal the space between the composite cable and the anode body.

[0012] In one embodiment, the composite cable further includes a core wire disposed inside the sheath, and the sheath further includes a notch to expose the core wire;

[0013] The reference electrode includes an insulating shell and a reference electrode body disposed on the insulating shell. The insulating shell is sleeved on the outer periphery of the sheath and communicates with the interior of the sheath through the notch. One end of the reference electrode is exposed outside the insulating shell, and the other end is connected to the core wire.

[0014] In one embodiment, the insulating shell includes a first sleeve and a second sleeve. The first sleeve is sleeved around the periphery of the composite cable. Second sealing plugs are provided at both ends of the first sleeve. The composite cable passes through two second sealing plugs in sequence. The second sleeve is located on one side of the first sleeve and communicates with the first sleeve. The reference electrode is located at the end of the second sleeve away from the first sleeve, and the end of the reference electrode inside the second sleeve passes through the notch via a wiring lug and communicates with the core wire.

[0015] In one embodiment, the reference electrode further includes a sealing cover, which is disposed at the end of the second sleeve away from the first sleeve. The sealing cover and the second sleeve are sealed together by a third sealing plug. The reference electrode is disposed on the sealing cover, and the wiring lug passes through the third sealing plug and is in communication with the core wire inside the insulating shell.

[0016] In one embodiment, a connection hole is provided at one end of the sealing cover away from the second sleeve, and a sealing ring is provided at the connection hole. One end of the reference electrode is connected to the wiring lug inside the sealing cover, and the other end extends through the sealing ring to the outside of the sealing cover.

[0017] In one embodiment, a second sealing filler is provided inside the insulating shell to seal the connection between the composite cable and the inner wall of the insulating shell.

[0018] In one embodiment, the first sealing plug and / or the second sealing plug and / or the third sealing plug are configured as gland heads;

[0019] And / or, the first sealing filler and the second sealing filler are epoxy AB component adhesives.

[0020] In this invention, one end of the composite cable is suspended from the pile foundation and connected to a potentiostat. The other end is connected to an auxiliary anode and a reference electrode. The auxiliary anode is connected to the positive terminal of the potentiostat via the composite cable, and the reference electrode is connected to the reference terminal of the potentiostat. The photovoltaic pile foundation is connected to the negative terminal of the potentiostat. The auxiliary anode includes an insulating sleeve and an anode body inside the insulating sleeve. The insulating sleeve is fitted around the outer periphery of the composite cable. The composite cable includes a sheath and a conductor. One end of the conductor is connected to the potentiostat, and the other end is exposed at the through hole of the sheath. A conductive module is provided between the composite cable and the insulating sleeve. The conductive module is fitted around the outer periphery of the composite cable and is in contact with the conductor through the through hole. The outer periphery of the conductive module is connected to the anode body to achieve anode-anode connection. The electrode is connected to the positive terminal of the potentiostat via a wire, allowing it to continuously receive the output current from the potentiostat. The conductive module ensures a more stable conduction process, and the counterweight keeps the composite cable taut due to gravity, reducing the impact of wind and waves on the stability of the underwater composite cable, auxiliary anode, and reference electrode. In this embodiment, the potentiostat, composite cable, auxiliary anode, reference electrode, and pile foundation constitute a complete cathodic protection circuit. The potentiostat is connected to the auxiliary anode via a wire in the composite cable, inputting current to the auxiliary anode. Electrons flow towards the pile foundation in the sea, causing cathodic protection. The reference electrode provides real-time feedback of the potential difference, allowing for timely adjustment of the potentiostat's input current and achieving effective cathodic protection for the photovoltaic pile foundation. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 A schematic diagram of an embodiment of the cathodic protection system for offshore photovoltaic pile foundations provided by this utility model;

[0023] Figure 2A cross-sectional schematic diagram of the auxiliary anode in the cathodic protection system provided by this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the conductive part in the cathodic protection system provided by this utility model;

[0025] Figure 4 A schematic diagram of the structure of the reference electrode in the cathodic protection system provided by this utility model;

[0026] Figure 5 An exploded schematic diagram of the reference electrode in the cathodic protection system provided by this utility model.

[0027] Explanation of icon numbers:

[0028] 100. Composite cable; 110. Sheath; 120. Conductor;

[0029] 200, Auxiliary anode; 210, Insulating sleeve; 220, Anode body; 230, First sealing plug; 240, First sealing filler;

[0030] 300, Reference electrode; 310, Insulating shell; 311, First sleeve; 312, Second sleeve; 320, Reference electrode body; 330, Second sealing plug; 340, Wiring lug; 350, Sealing cover; 360, Sealing ring; 370, Third sealing plug;

[0031] 400. Conductive module; 410. Conductive part; 411. Inclined surface; 412. Limiting groove;

[0032] 500, counterweight.

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0035] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] Marine photovoltaic (PV) foundations are subject to severe corrosion in seawater and marine environments, leading to perforation and significantly impacting their structural safety. While anti-corrosion coatings are commonly used, their durability in the fully submerged and tidal zones declines annually. Without cathodic protection, safety is severely compromised. Currently, sacrificial anode protection is employed, connecting a more negatively charged, more reactive metal to the protected steel structure to form a galvanic cell. In this cell, the reactive metal, acting as the anode, preferentially corrodes, sacrificing itself to protect the steel structure (cathode) from corrosion. However, as the sacrificial anode protection period increases, the underwater PV foundations will gradually exceed the design life of the cathodic protection, necessitating timely replacement of the anode material, which is inconvenient.

[0038] This utility model proposes a cathodic protection system for offshore photovoltaic pile foundations.

[0039] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the cathodic protection system for offshore photovoltaic pile foundations includes:

[0040] An auxiliary anode 200 and a reference electrode 300 are disposed on one side of the photovoltaic pile foundation, and the auxiliary anode 200 and the reference electrode 300 are spaced apart. The auxiliary anode 200 includes an insulating sleeve 210 and an anode body 220 disposed inside the insulating sleeve 210.

[0041] A composite cable 100 is installed on one side of the photovoltaic pile foundation. One end of the composite cable 100 is electrically connected to a potentiostat, and the other end passes through the auxiliary anode 200 and the reference electrode 300, and is connected to the auxiliary anode 200 and the reference electrode 300 respectively. The composite cable 100 includes a sheath 110 and a conductor 120 inside the sheath 110. The portion of the composite cable 100 installed inside the auxiliary anode 200 has a through hole to expose the conductor 120.

[0042] A conductive module 400 is disposed inside the insulating sleeve 210 and is in contact with and conductively connected to the anode body 220. The conductive module 400 is also sleeved outside the sheath 110 and passes through a through hole to be conductively connected to the wire 120.

[0043] The counterweight 500 is located at the end of the composite cable 100 furthest from the pile foundation.

[0044] In the technical solution of this utility model, one end of the composite cable 100 is suspended on the pile foundation and connected to a potentiostat, while the other end is connected to an auxiliary anode 200 and a reference electrode 300. The auxiliary anode 200 is connected to the positive terminal of the potentiostat via the composite cable 100, and the reference electrode 300 is connected to the reference terminal of the potentiostat. The photovoltaic pile foundation is connected to the negative terminal of the potentiostat. The auxiliary anode 200 includes an insulating sleeve 210 and an anode body 220 on the inner wall of the insulating sleeve 210. The insulating sleeve 210 is fitted around the outer periphery of the composite cable 100. The composite cable 100 includes a sheath 110 and a conductor 120. One end of the conductor 120 is connected to the potentiostat, and the other end is exposed at the through hole of the sheath 110. A conductive module 400 is provided between the composite cable 100 and the insulating sleeve 210. The conductive module 400 is fitted around the outer periphery of the composite cable 100 and is in contact with the conductor 120 through the through hole. The anode 220 is connected to the positive terminal of the potentiostat via the wire 120, allowing it to continuously receive the output current from the potentiostat. The conductive module 400 makes the conduction process more stable, and the counterweight 500 keeps the composite cable 100 taut due to gravity, reducing the impact of wind and waves on the stability of the underwater composite cable 100, auxiliary anode 200, and reference electrode 300. In this embodiment, the potentiostat, composite cable 100, auxiliary anode 200, reference electrode 300, and pile foundation constitute a complete cathodic protection circuit. The potentiostat is connected to the auxiliary anode 200 via the wire 120 in the composite cable 100, inputting current to the auxiliary anode 200. Electrons flow to the pile foundation in the sea, causing it to cathodically. The reference electrode 300 provides real-time feedback of the potential difference, allowing for timely adjustment of the potentiostat's input current and achieving effective cathodic protection for the photovoltaic pile foundation.

[0045] Specifically, this cathodic protection system is applied to photovoltaic (PV) pile foundations, which integrate the PV support structure with the foundation piles. The anode body 220 of the auxiliary anode 200 can be made of conductive materials such as graphite and mixed metal oxides to release and protect current. An insulating sleeve 210 is installed outside the anode body 220. The insulating sleeve 210 can be made of insulating materials such as PVC, PE, and polyurethane. The reference electrode 300 is connected to the reference terminal of a potentiostat via a composite cable 100. The reference electrode 300 can be made of Ag / AgCl or pure zinc. The auxiliary anode 200 sends the positive current from the power supply into the seawater, causing the pile foundation to become... The cathode and reference electrode 300 detect the potential of the pile foundation relative to seawater and send the detected potential value back to the potentiostat in real time. For example, the protection potential of the pile foundation is set at -0.80V to -1.05V (relative to Ag / AgCl) according to the NACESP0176 standard. When the potential value detected by the reference electrode 300 is >-0.80V, the output current of the auxiliary anode 200 needs to be increased. When the detected potential value is <-1.05V, the current of the auxiliary anode 200 needs to be cut off or reduced to prevent overprotection. The adjusted current is continuously injected into the seawater through the auxiliary anode 200 and is detected and verified again by the reference electrode 300.

[0046] The composite cable 100 includes a sheath 110 and conductors 120 and core wires inside the sheath 110. Conductors 120 connect to the auxiliary anode 200 and the positive terminal of the potentiostat, and the core wires connect to the reference electrode 300 and the reference terminal of the potentiostat. Insulation layers are provided on both conductors 120 and core wires to insulate them from each other. Conductors 120 and core wires can be made of copper wire with a diameter of 0.67±0.1mm, which is not limited here. Typically, the cross-section of conductor 120 is larger than that of core wires. The insulation layer is made of polyethylene with a thickness of 0.7mm, which is not limited here. The sheath 110 is made of special five-way flame-retardant and weather-resistant polyethylene with a thickness and diameter of approximately 1.2mm, which is not limited here. In another embodiment, the composite cable 100 also includes a steel wire rope inside the sheath 110, isolated from the core wires and conductors 120. The bottom of the steel wire rope is connected to a counterweight 500 via a hook.

[0047] Please refer to Figure 2 and Figure 3 In an embodiment of this utility model, the conductive module 400 includes two conductive parts 410. Each conductive part 410 has an installation space and an inclined surface 411. The two conductive parts 410 are staggered and the two inclined surfaces 411 abut each other, so that the two conductive parts 410 surround to form a cylindrical body with open ends. The composite cable 100 is disposed in the installation space, and the outer periphery of the conductive part 410 is in contact with the anode body 220.

[0048] Specifically, the conductive part 410 is configured as a conductive copper wedge. The conductive part 410 has two end faces. The cross-section of the first end face is smaller than that of the second end face. The first side connecting the two end faces is an arc shape, and the other side is an inclined surface 411. The inclined surfaces 411 of the two conductive parts 410 abut against each other. A limiting groove 412 is provided on one side of the inclined surface 411. The limiting grooves 412 of the two conductive parts 410 surround each other to form a limiting hole. The outer periphery of the two conductive parts 410 is a cylindrical body. The composite cable 100 passes through the limiting hole, and the wire 120 is connected to the anode body 220 through the conductive part 410, so as to realize the input of positive current towards the auxiliary anode 200 through the composite cable 100.

[0049] In one embodiment, during assembly, the conductive module 400 is first assembled with the composite cable 100. Two conductive parts 410 are respectively attached to the outer periphery of the composite cable 100. Then, the wire 120 is pulled out from the through hole and connected to the conductive part 410 for conductivity. Specifically, the wire 120 can be connected to the conductive part 410 by welding. After the conductive module 400 and the composite cable 100 are assembled into a whole, this whole is assembled with the auxiliary anode 200. That is, the composite cable 100 extends into the insulating sleeve 210 from one end and extends out from the other end, inside the insulating sleeve 210. Since the outer periphery of the conductive part 410 is in contact with the anode body 220, the conductor 120 and the anode body 220 are connected. In order to ensure the stability of the connection, a support rod is inserted into each end of the insulating sleeve 210 and pushed against the second end face of the two conductive parts 410, i.e. the end with the larger cross-sectional area. This pushes the two conductive parts 410 toward the second end face of the other conductive part 410 until the first end of any conductive part 410 and the second end of the other conductive part 410 are on the same plane. At this time, a limit is formed, which can prevent the conductive part 410 from moving inside the sheath 110 and affecting the stability of the connection.

[0050] In one embodiment, a connection port is provided on the first end face of the conductive part 410, and the connection port is connected to the limiting groove 412.

[0051] Please refer to Figure 2 In an embodiment of this utility model, the insulating sleeve 210 has openings at both ends, and a first sealing plug 230 is provided at each end of the insulating sleeve 210. The composite cable 100 passes through the two first sealing plugs 230 in sequence.

[0052] Specifically, the composite cable 100 passes through one end of the auxiliary anode 200 and exits from the other end. Since the auxiliary anode 200 is underwater, in order to prevent water from entering the auxiliary anode 200, first sealing plugs 230 are respectively provided at both ends of the insulating sleeve 210. That is, the composite cable 100 passes through the two first sealing plugs 230 in sequence and is connected to the anode body 220 in the insulating sleeve 210. The setting of the first sealing plugs 230 can improve the corrosion resistance of the anode body 220 and ensure the watertight effect.

[0053] In one embodiment, the first sealing plug 230 can be a gland, which can be a plastic gland or a metal gland. The locking nut inside the gland is fixed to the insulating sleeve 210. At one end, the composite cable 100 passes through the sealing ring 360 and the clamping claw of the gland. The sealing ring 360 of the gland wraps around the outer wall of the composite cable 100, forming a waterproof and dustproof barrier. As the nut is tightened, the clamping claw contracts, clamping the outer periphery of the composite cable 100 to prevent the composite cable 100 from slipping or rotating. After the sealing nut of the gland is tightened, it compresses the sealing ring 360 and the clamping claw, achieving the dual functions of sealing and fastening.

[0054] Please refer to Figure 2 In an embodiment of this utility model, a first sealing filler 240 is provided inside the insulating sleeve 210, which is used to fill the space between the sealing composite cable 100 and the anode body 220.

[0055] Specifically, adhesive is injected into the interior of the insulating sleeve 210 from top to bottom. The composite cable 100 passes sequentially through the glands at both ends of the auxiliary anode 200. The lower gland is then installed onto the auxiliary anode 200. Next, the first sealing filler 240 is injected from the upper end of the auxiliary anode 200 until it completely fills the interior of the insulating sleeve 210 and overflows to the upper end. At this point, the upper gland is installed onto the auxiliary anode 200, thus sealing the auxiliary anode 200. It is important to note that after the first sealing filler 240 is injected into the insulating sleeve 210, it needs to be allowed to stand for 24 hours to allow for complete solidification. During this time, the first sealing filler 240 also solidifies and fixes the glands at both ends, further improving the sealing effect.

[0056] In one embodiment, the first sealing filler 240 can be made of epoxy AB component adhesive, which has high compressive strength and strong pressure resistance, effectively protecting the interior from corrosion even under high pressure conditions in the ocean. In another embodiment, the first sealing filler 240 can also be made of two-component polyurethane, which has good elasticity, hydrolysis resistance, and good flowability, allowing it to fill various gaps. No limitation is made here, but in this embodiment, the first sealing filler 240 is preferably epoxy AB component adhesive.

[0057] Please refer to Figure 4 In an embodiment of the present invention, the composite cable 100 further includes a core wire disposed inside the sheath 110, and the sheath 110 further includes a notch to expose the core wire.

[0058] The reference electrode 300 includes an insulating shell 310 and a reference electrode 320 disposed on the insulating shell 310. The insulating shell 310 is sleeved on the outer periphery of the sheath 110 and communicates with the interior of the sheath 110 through a notch. One end of the reference electrode 300 is exposed outside the insulating shell 310, and the other end is connected to the core wire.

[0059] Specifically, the core wire is insulated from the conductor 120 inside the sheath 110. The insulating shell 310 of the reference electrode 300 is sleeved on the outer periphery of the composite cable 100, similar to the auxiliary anode 200. The core is pulled out from the notch in the sheath 110 and is electrically connected to the reference electrode 320 in the insulating shell 310. The insulating shell 310 is made of insulating materials such as PVC, PE, and polyurethane, without any restrictions. The reference electrode 320 is connected to the reference terminal of the potentiostat through the core wire. The reference electrode 320 can be Ag / AgCl or pure zinc. One end of the reference electrode 320 is inside the insulating shell 310 and the other end is outside the insulating shell 310 and immersed in seawater to detect the potential of the seawater relative to the pile foundation. The detected potential is transmitted to the potentiostat through the core wire to regulate the input current.

[0060] Please refer to Figure 4 and Figure 5 In an embodiment of this utility model, the insulating shell 310 includes a first sleeve 311 and a second sleeve 312. The first sleeve 311 is sleeved on the outer periphery of the composite cable 100. Second sealing plugs 330 are provided at both ends of the first sleeve 311. The composite cable 100 passes through the two second sealing plugs 330 in sequence. The second sleeve 312 is located on one side of the first sleeve 311 and communicates with the first sleeve 311. The reference electrode 320 is located at the end of the second sleeve 312 away from the first sleeve 311. The end of the reference electrode 320 inside the second sleeve 312 passes through a notch via a wiring lug 340 and communicates with the core wire.

[0061] Specifically, the first sleeve 311 and the second sleeve 312 are connected and form a Y shape. The first sleeve 311 is sleeved on the outside of the composite cable 100, and the notch of the composite cable 100 is located inside the first sleeve 311. The core wire is pulled out from the notch into the first sleeve 311. The second sleeve 312 is inclined on one side of the first sleeve 311. One end of the reference electrode 320 is exposed outside the second sleeve 312, and the other end is inside the second sleeve 312. A connector lug 340 is provided. The head of the connector lug 340 is annular, and the tail is cylindrical. A bolt passes through the connector lug 340 and screws it to the reference electrode 320 to achieve the connection between the connector lug 340 and the reference electrode 320. The other end of the connector lug 340 is crimped to the core wire. The connection of the connector lug 340 makes the conduction between the reference electrode 320 and the core wire more stable. Furthermore, the first sleeve 311 is provided with a second sealing plug 330 at each end. The second sealing plug 330 can be a gland, which can be a plastic gland or a metal gland. The installation method is the same as that of the first sealing plug 230, and will not be described here.

[0062] Please refer to Figure 4 and Figure 5 In an embodiment of this utility model, the reference electrode 300 further includes a sealing cover 350. The sealing cover 350 is disposed at the end of the second sleeve 312 away from the first sleeve 311. The sealing cover 350 and the second sleeve 312 are sealed together by a third sealing plug 370. The reference electrode 300 is disposed on the sealing cover 350, and the wiring lug 340 passes through the third sealing plug 370 and is in communication with the core wire inside the insulating shell 310.

[0063] Specifically, the sealing cover 350 includes a first cover and a second cover. The diameter of the first cover is larger than that of the second cover. The second cover is close to the second sleeve 312. The second cover and the second sleeve 312 are connected by a third sealing plug 370. One end of the second cover extends into the third sealing plug 370. One end of the reference electrode 320 is inside the first cover. The wiring lug 340 passes through the second cover and the third sealing plug 370 and then into the insulating shell 310 to conduct to the core wire. The sealing effect can be further improved by setting the third sealing plug 370 and the sealing cover 350, so as to prevent seawater from entering the interior and affecting the detection of potential.

[0064] In one embodiment, the third sealing plug 370 can be a gland, which can be a plastic gland or a metal gland, and is installed in the same way as the first sealing plug 230, so it will not be described in detail.

[0065] Please refer to Figure 5In one embodiment, a connection hole is provided at the end of the sealing cover 350 away from the second sleeve 312, and a sealing ring 360 is provided at the connection hole. One end of the reference electrode 320 is connected to the wiring lug 340 inside the sealing cover 350, and the other end extends through the sealing ring 360 to the outside of the sealing cover 350. The sealing ring 360 is provided at the connection hole at the end of the sealing cover 350 away from the second sleeve 312. The reference electrode 320 passes through the sealing ring 360. The material of the sealing ring 360 can be nitrile, fluororubber, PU, ​​FFKM, etc., and there is no limitation. This further improves the sealing effect inside the sealing cover 350.

[0066] Please refer to Figure 5 In an embodiment of this utility model, a second sealing filler (not shown) is provided inside the insulating shell 310 to seal the connection between the composite cable 100 and the inner wall of the insulating shell 310. The second sealing filler is the same as the first sealing filler 240, and the material can be epoxy AB component adhesive, or two-component polyurethane, preferably epoxy AB component adhesive, but no limitation is made here.

[0067] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A cathodic protection system for offshore photovoltaic pile foundations, applied to photovoltaic pile foundations, characterized by, The cathodic protection system includes: An auxiliary anode and a reference electrode are disposed on one side of the photovoltaic pile foundation, and the auxiliary anode and the reference electrode are spaced apart. The auxiliary anode includes an insulating sleeve and an anode body disposed inside the insulating sleeve. A composite cable is provided on one side of the photovoltaic pile foundation. One end of the composite cable is electrically connected to a potentiostat, and the other end passes through the auxiliary anode and the reference electrode and is connected to the auxiliary anode and the reference electrode respectively. The composite cable includes a sheath and a conductor inside the sheath. The portion of the composite cable located inside the auxiliary anode has a through hole to expose the conductor. A conductive module, disposed within the insulating sleeve and in contact with the anode body for electrical communication, is also sleeved outside the sheath and passes through the through hole to communicate with the wire; and A counterweight is located at the end of the composite cable furthest from the pile foundation.

2. The offshore photovoltaic pile foundation cathodic protection system of claim 1, wherein, The conductive module includes two conductive parts, each having an installation space and an inclined surface. The two conductive parts are staggered and the two inclined surfaces abut each other, so that the two conductive parts together form a cylindrical body with open ends. The composite cable is disposed in the installation space, and the outer periphery of the conductive part is in contact with the anode body.

3. The offshore photovoltaic pile foundation cathodic protection system of claim 1, wherein, The insulating sleeve is open at both ends, and a first sealing plug is provided at each end of the insulating sleeve. The composite cable passes through the two first sealing plugs in sequence.

4. The offshore photovoltaic pile foundation cathodic protection system of claim 3, wherein, The insulating sleeve is provided with a first sealing filler, which is used to fill and seal the space between the composite cable and the anode body.

5. The offshore photovoltaic pile foundation cathodic protection system of claim 4, wherein, The composite cable also includes a core wire disposed inside the sheath, and the sheath also includes a notch to expose the core wire; The reference electrode includes an insulating shell and a reference electrode body disposed on the insulating shell. The insulating shell is sleeved on the outer periphery of the sheath and communicates with the interior of the sheath through the notch. One end of the reference electrode is exposed outside the insulating shell, and the other end is connected to the core wire.

6. The offshore photovoltaic pile foundation cathodic protection system of claim 5, wherein, The insulating shell includes a first sleeve and a second sleeve. The first sleeve is sleeved around the periphery of the composite cable. Second sealing plugs are provided at both ends of the first sleeve. The composite cable passes through the two second sealing plugs in sequence. The second sleeve is located on one side of the first sleeve and communicates with the first sleeve. The reference electrode is located at the end of the second sleeve away from the first sleeve, and the end of the reference electrode inside the second sleeve passes through the notch through a wiring lug and communicates with the core wire.

7. The offshore photovoltaic pile foundation cathodic protection system of claim 6, wherein, The reference electrode also includes a sealing cover, which is located at the end of the second sleeve away from the first sleeve. The sealing cover and the second sleeve are sealed together by a third sealing plug. The reference electrode is located in the sealing cover, and the wiring lug passes through the third sealing plug and is in communication with the core wire inside the insulating shell.

8. The offshore photovoltaic pile foundation cathodic protection system of claim 7, wherein, The sealing cover has a connection hole at one end away from the second sleeve, and a sealing ring is provided at the connection hole. One end of the reference electrode is connected to the wiring lug inside the sealing cover, and the other end extends through the sealing ring to the outside of the sealing cover.

9. The offshore photovoltaic pile foundation cathodic protection system of claim 7, wherein, A second sealing filler is arranged in the insulating shell to seal the connection between the composite cable and the inner wall of the insulating shell.

10. The offshore photovoltaic pile foundation cathodic protection system of claim 9, wherein, The first sealing plug and / or the second sealing plug and / or the third sealing plug is configured as a Luer. And / or, the first sealing filler and the second sealing filler are epoxy AB component glue.

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