Auxiliary electrode device for PFE ocean grounding of cable laying ship and use method of auxiliary electrode device

Abstract

The invention relates to the technical field of ship power supply, and discloses an auxiliary electrode device for cable laying ship PFE ocean grounding, which comprises an electrode device, a water inlet gate valve, a water inlet control switch of the water inlet gate valve, a water inlet assembly and a ship deck, and is characterized in that the electrode device and the water inlet gate valve as well as the water inlet gate valve and the water inlet assembly are hermetically connected through flanges; the water inlet assembly is composed of a water inlet pipe and reinforcing ribs, the water inlet pipe and the reinforcing ribs are connected with a ship deck in a welded mode, a water tank of the electrode device is in sealed connection with the water inlet gate valve, the water level control assembly is located on one side of the water tank, and the water inlet assembly is connected with the water inlet gate valve. The grounding problem in the existing submarine cable laying process can be solved, the submarine cable laying requirement can be met, meanwhile, impressed current protection of a hull shell cannot be interfered, the cable can be stably grounded, and a simple, reliable and economical grounding electrode pair is provided for improving submarine cable laying. And the method has important significance in improving the reliability of the ship and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of ship power supply, and in particular to an auxiliary electrode device for PFE marine grounding of a cable-laying ship and a use method thereof. Background Art

[0002] With the continuous development of science and technology and the gradual development and utilization of marine resources, the demand for laying submarine cables is increasing, especially in the fields of communications, energy transmission, marine observation, etc. As an important communication and energy transmission channel connecting the world, the safe and reliable laying of submarine cables is crucial to ensure the smooth progress of various marine engineering projects.

[0003] In the traditional submarine cable laying process, cable grounding is a key issue. However, the submarine cable laying process often faces many challenges. The harsh conditions of the marine environment, the complexity of the submarine topography, and the characteristics of the cable itself may affect the laying process. Among them, the cable grounding problem is a particularly critical technical problem. Good grounding can effectively reduce the risk of cable damage and ensure the stable operation of the cable system. In the submarine environment, static electricity or charge accumulation is easy to occur. These static electricity or charges may damage the cable, affecting its performance and life. To avoid the impact of static electricity on the cable and facilitate real-time detection of the optical cable laying situation, combined with the particularity of the cable structure, one end of the cable can be grounded before the shore electrode is pulled. In order to form a closed loop, an electrode needs to be installed on the ship to form a loop with the shore electrode. The hull shell cannot have the particularity of high voltage access to the hull due to the external current protection. Therefore, the installation position of the grounding electrode needs to be insulated from the hull and meet the requirements of marine cable laying.

[0004] Document CN202010610368 discloses an electromagnetic shielding grounding method for incoming ship signal cables and its shielding grounding structure, which discloses: 1) fixing a metal braided sheath (1) on a device housing (7) through a cable metal stuffing box (2); 2) passing a signal cable (4) through the cable metal stuffing box (2), and passing the signal cable (4) through the metal braided sheath (1); 3) stripping off the insulating outer sheath of the signal cable (4) to expose the signal cable shielding sheath (5); 4) fastening the metal braided sheath (1) to the signal cable shielding sheath (5) through a cable tie (6); this situation will interfere with the hull current, and the grounding current is not very stable.

[0005] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a more effective marine grounding auxiliary electrode system, which serves as a backup electrode for the main electrode to solve the grounding problem in the existing submarine cable laying. It can meet the requirements of submarine cable laying while not interfering with the external current protection of the hull, and can stably ground the cable. The simple, reliable and economical grounding electrode is of great significance to improving the laying effect and efficiency of submarine cables, saving costs, and improving ship reliability. The present invention discloses an auxiliary electrode device for marine grounding of a cable-laying ship PFE and a method of using the same.

[0007] The technical solution of the present invention is: an auxiliary electrode device for PFE marine grounding of a cable-laying ship, comprising an electrode device, a water inlet gate valve and its water inlet control switch, a water inlet assembly, and a ship deck. The electrode device and the water inlet gate valve, as well as the water inlet gate valve and the water inlet assembly are all sealed and connected via flanges; the water inlet assembly consists of an inlet pipe and reinforcing ribs, which are respectively connected to the ship deck by welding, a water tank of the electrode device and the water inlet gate valve are sealed and connected, the water tank of the electrode device and the water inlet gate valve are sealed and connected, a water level control assembly is located on one side of the water tank, and the water inlet assembly and the water inlet gate valve are connected.

[0008] Preferably, the electrode device includes a water tank, a water level control assembly, a water tank cover, an electrode assembly, and an exhaust valve. A flange connected to the water tank cover is fixedly mounted on the outer surface of the upper end of the water tank, and a connecting flange is fixedly mounted on the outer surface of the lower end of the water tank. The connecting flange is sealed and connected to the water inlet valve by bolts. The water level control assembly is arranged on the outside of the water tank and is connected to the inside of the water tank through a pipeline.

[0009] Preferably, the water tank cover is sealed and connected to the upper part of the water tank via a flange, an exhaust valve and symmetrically arranged lifting rings are provided on the water tank cover, and a through hole for the power supply assembly to pass through is provided at the center of the water tank cover.

[0010] Preferably, the water level control component includes an upper water level pipeline, a water level observation column, a water level scale, a lower water level pipeline and a drain outlet. Water level sensors are respectively provided at the ends of the upper water level pipeline and the lower water level pipeline. The water level scale is fixed on the water level observation column. The water level observation column is connected to the water tank through flanges provided on the upper water level pipeline and the lower water level pipeline. The drain outlet is located on one side of the lower water level pipeline.

[0011] By adopting the above technical solution, the water level sensor is connected to an external controller, and the water level sensor and the water level observation column together constitute double protection for water level control.

[0012] Preferably, the electrode assembly includes a cable, a stuffing box, a cavity cover, a wiring nose, an insulating sleeve, an insulating heat shrink sleeve and a titanium electrode tube. The end of the cable is connected to the wiring nose. The end of the bent section of the wiring nose is fixedly connected to the head of the stud bolt by a bolt. The stud bolt fixes the electrode assembly to the water tank cover through the connecting assembly.

[0013] Preferably, an insulating washer and an insulating sleeve are provided in sequence between the upper end of the stud bolt and the water tank cover, the end of the stud bolt is located inside the titanium electrode tube, an insulating heat shrink sleeve is provided on the outer side of the upper end of the titanium electrode tube, and a washer is provided on the outer side of the insulating washer and between the upper end surface of the insulating heat shrink sleeve.

[0014] By adopting the above technical solution, the gasket, insulating gasket and insulating sleeve meet the needs of electrical insulation. An insulating heat shrink sleeve is arranged on the outer side of the upper end of the titanium electrode tube to prevent the upper end of the titanium electrode tube from contacting the water tank cover. Preferably, the cavity cover is a disc-shaped body with fixed through holes around the bottom, a hollow cylinder above the middle of the disc, through holes in the middle of the top and bottom respectively, a stuffing box is fixedly installed through the cylindrical through holes on the top of the cavity cover, and the top of the stuffing box is fixedly connected to the cable.

[0015] A method for using an auxiliary electrode device for PFE marine grounding of a cable-laying vessel comprises the following steps: Step 1: Install the electrode device on the water inlet valve; Step 2: Connect the cable of the electrode assembly to the PFE isolated power supply; Step 3: Use of auxiliary electrode system S31: Preparation for use Connect one end of the submarine cable to the high voltage output of the PFE isolation power supply on board, i.e. the near end, and the other end, i.e. the far end, to ground at the submarine cable landing station. S32: Seawater injection Open the exhaust valve and the water inlet control switch, control the injection of seawater into the water tank of the electrode device, and observe the seawater through the water level observation column until the water level upper limit pipeline or the water level scale reaches the upper limit setting value, or when the water level sensor alarms, close the water inlet control switch and the exhaust valve to stop water injection; S33: Entering operation During the construction process, the electrode device enters normal operation; after the construction is completed, the steps are executed; Step 4: Discharge of seawater Open the exhaust valve and control the drain switch on the drain outlet to discharge the seawater in the water tank. When the water level sensor of the lower limit pipeline alarms or the water level scale reaches the lower limit setting value, close the drain switch and exhaust valve on the drain outlet to end this use.

[0016] The benefits of the present invention are as follows: 1. The present invention has an electrostatic protection effect. During the laying of submarine cables, materials such as optical cables may be affected by static electricity, and the auxiliary electrodes can help release static electricity and reduce charge accumulation on the cable surface, thereby reducing the risk of damage caused by static electricity.

[0017] 2. The grounding stability of the present invention is good: the auxiliary electrode forms a grounding connection by connecting to seawater, which can help ensure that the optical cable system maintains a good grounding state during the laying process, reduce the grounding impedance, and improve the stability of the grounding effect.

[0018] 3. The present invention arranges a water level observation column on the water tank box, which can observe the water level in the water tank box in real time, preventing the electrode from continuing to work due to conductors still remaining in the tank after the work is finished, thereby improving the safety of operators and ships.

[0019] 4. The present invention reduces the risk of cable damage: through an effective grounding system, the continuity of the optical cable can be detected in real time, which can reduce the risk of external damage to the optical cable.

[0020] 5. The present invention has a reasonable structural design and is easy to install. The electrode device and the HPR gate valve connection structure are adopted to install the grounding electrode on the HPR gate valve. The grounding electrode can be controlled to work by opening and closing the HPR gate valve. The grounding electrode is not worn out, which is convenient for grounding control and installation. The titanium electrode is used to adapt to severe sea conditions and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a composition diagram of the auxiliary electrode system of the present invention; Figure 2 An exploded view of the auxiliary electrode assembly of the present invention; Figure 3 A diagram showing the connection relationship of the auxiliary electrode assembly of the present invention; Figure 4 Schematic diagram of the application scenario of the auxiliary electrode system of the present invention.

[0022] Wherein: A-electrode device, B-water inlet valve, B1-water inlet control switch, C-water inlet assembly, C1-water inlet pipe, C2-reinforcement rib, D-ship deck, 1-water tank, 2-water level control assembly, 3-water tank cover, 4-electrode assembly, 5-exhaust valve, 201-water level upper limit pipeline, 202-water level observation column, 203-water level scale, 204-water level lower limit pipeline, 205-drain port; 401-cable, 402-stuffing box, 403-cavity cover, 404-bolt, 405-wiring nose, 406-connection assembly, 407-washer, 408-insulating washer, 409-stud bolt, 410-insulating sleeve, 411-insulating heat shrink sleeve, 412-titanium electrode tube, 407a-washer; 01-PFE isolated power supply, 02-submarine cable. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] like Figure 1 As shown, an auxiliary electrode device for PFE marine grounding of a cable-laying ship comprises an electrode device A, a water inlet valve B and a water inlet control switch B1 thereof, a water inlet pipe C, a water inlet assembly C, and a ship deck D. The electrode device A and the water inlet valve B, and the water inlet valve B and the water inlet assembly C are all sealed and connected via flanges; the water inlet assembly C consists of a water inlet pipe C1 and a reinforcing rib C2, and the water inlet pipe C1 and the reinforcing rib C2 are respectively connected to the ship deck D by welding, and is characterized in that: a water tank of the electrode device A is sealed and connected to the water inlet valve B, a water tank 1 of the electrode device A is sealed and connected to the water inlet valve B, a water level control assembly 2 is located on one side of the water tank 1, and the water inlet assembly C is connected to the water inlet valve B. The electrode device A includes a water tank 1, a water level control component 2, a water tank cover 3, an electrode component 4, an exhaust valve 5 and a drain outlet 6. A flange connected to the water tank cover 3 is fixedly installed on the outer surface of the upper end of the water tank 1, and a connecting flange is fixedly installed on the outer surface of the lower end of the water tank 1. The connecting flange is sealed and connected to the water inlet valve B by bolts. The water level control component 2 is arranged on the outside of the water tank 1 and is connected to the inside of the water tank 1 through a pipeline.

[0025] The water tank cover 3 is sealed and connected to the upper part of the water tank 1 through a flange. An exhaust valve 5 and symmetrically arranged lifting rings are provided on the water tank cover 3. A through hole for the power supply assembly 4 to pass through is provided at the center of the water tank cover 3.

[0026] like Figure 2 and 3 As shown, the water level control component 2 includes an upper water level pipeline 201, a water level observation column 202, a water level gauge 203, a lower water level pipeline 204 and a drain outlet 205. Water level sensors are respectively arranged at the ends of the upper water level pipeline 201 and the lower water level pipeline 204. The water level gauge 203 is fixed on the water level observation column 202. The water level observation column 202 is connected to the water tank 1 through flanges arranged on the upper water level pipeline 201 and the lower water level pipeline 204. The upper water level pipeline 201 and the lower water level pipeline 204 are connected through the water level observation column 202. The drain outlet 205 is located on one side of the lower water level pipeline 204. The water level sensor is connected to an external controller. The water level sensor and the water level observation column 202 together constitute double protection for water level control.

[0027] The electrode assembly includes a cable 401, a stuffing box 402, a cavity cover 403, a wiring nose 405, an insulating sleeve 410, an insulating heat shrink sleeve 411 and a titanium electrode tube 412. The end of the cable 401 is connected to the wiring nose 405. The end of the bent section of the wiring nose 405 is fixedly connected to the head of a stud bolt 409 by a bolt 404. The stud bolt 409 fixes the electrode assembly 4 to the water tank cover 3 through a connecting assembly 406.

[0028] An insulating washer 408 and an insulating sleeve 410 are provided between the upper end of the stud bolt 409 and the water tank cover in sequence. The end of the stud bolt is located in the titanium electrode tube 412. An insulating heat shrink sleeve 411 is provided on the outer side of the upper end of the titanium electrode tube 412. A washer 407 is provided on the outer side of the insulating washer 408 and between the upper end surface of the insulating heat shrink sleeve. The washer, insulating washer 408 and insulating sleeve 410 meet the needs of electrical insulation. An insulating heat shrink sleeve 411 is provided on the outer side of the upper end of the titanium electrode tube 412 to prevent the upper end of the titanium electrode tube 412 from contacting the water tank cover 3.

[0029] The cavity cover 403 is a disc-shaped body with fixed through holes around the bottom. The upper middle of the disc is a hollow cylinder with through holes in the middle of the top and bottom respectively. The stuffing box 402 is fixedly installed through the cylindrical through holes on the top of the cavity cover 403, and the top of the stuffing box 402 is fixedly connected to the cable 401.

[0030] The parameter design of the titanium electrode tube 412 includes the design of electrode material and shape, calculation of the total effective surface area of ​​the electrode and determination of the electrode structure parameters; According to the requirements of conductivity, seawater temperature, marine corrosion, non-toxicity, etc., titanium was selected as the electrode material by consulting the national standard "Titanium and Titanium Alloy Plates (GB / T3621-2007)"; considering the problem of the left and right swaying amplitude of the ship when sailing in harsh sea conditions, the electrode was selected as a cylinder and installed on the original sea valve so that part of it is still below the water surface when the ship sways to the maximum amplitude. The total effective surface area of ​​the required PFE grounding electrode is calculated according to the formula Sa=I / ia, where: Sa — Total effective surface area of ​​PFE grounding electrode. The unit is square meter (㎡); I — working current, in ampere (A); ia — working current density of PFE grounding electrode, in ampere per square meter (A / ㎡). The working current density of titanium alloy PFE grounding electrode ranges from 500 to 600A / ㎡; Combined with the installation requirements of the hull outer plate and the total effective surface area Sa of the electrode calculated by the above method, the structural parameters radius and height of the cylindrical electrode are calculated.

[0031] As a design example, take I=2.5A, ia=500A / ㎡, and calculate Sa=0.005㎡. Further, the radius of the cylinder is selected as 0.07m and the height is 0.36m.

[0032] As shown in Figure 4, a method for using an auxiliary electrode device for PFE marine grounding of a cable-laying vessel comprises the following steps: Step 1: Install the electrode device A on the water inlet valve B; Step 2: Connect the cable 401 of the electrode assembly 4 to the PFE isolation power supply 01; Step 3: Use of auxiliary electrode system S31: Preparation for use Connect one end of the submarine cable 02 to the high voltage output of the PFE isolation power supply 01 on board, i.e. the near end, and the other end, i.e. the far end, to ground at the submarine cable landing station; S32: Seawater injection Open the exhaust valve 5 and the water inlet control switch B1, control the injection of seawater into the water tank 1 of the electrode device A, and observe the seawater through the water level observation column 202 until the water level reaches the upper limit set value of the water level pipe 201 or the water level scale 203, or when the water level sensor alarms, close the water inlet control switch B1 and the exhaust valve 5 to stop water injection; S33: Entering operation During the construction process, the electrode device A enters normal operation; after the construction is completed, execute step 4; Step 4: Discharge of seawater Open the exhaust valve 5 and control the drain switch on the drain outlet 205 to discharge the seawater in the water tank 1. When the water level sensor of the lower limit pipeline 204 alarms or the water level scale 203 reaches the lower limit setting value, close the drain switch on the drain outlet 205 and the exhaust valve 5 to end this use.

[0033] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention, and the purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. An auxiliary electrode device for PFE marine grounding of a cable-laying ship, comprising an electrode device, a water inlet gate valve and a water inlet control switch thereof, a water inlet assembly, and a ship deck. The electrode device and the water inlet gate valve, and the water inlet gate valve and the water inlet assembly are all sealed and connected by flanges. The water inlet assembly consists of an inlet pipe and a reinforcing rib, and the inlet pipe and the reinforcing rib are respectively connected to the ship deck by welding, and is characterized in that: The water tank of the electrode device is sealed and connected to the water inlet gate valve, the water level control component is located at one side of the water tank, and the water inlet component is connected to the water inlet gate valve.

2. The auxiliary electrode device for PFE marine grounding of a cable-laying vessel according to claim 1, characterized in that: The electrode device includes a water tank, a water level control component, a water tank cover, an electrode component, and an exhaust valve. A flange connected to the water tank cover is fixedly installed on the outer surface of the upper end of the water tank, and a connecting flange is fixedly installed on the outer surface of the lower end of the water tank. The connecting flange is sealed and connected to the water inlet valve by bolts. The water level control component is arranged on the outside of the water tank and is connected to the inside of the water tank through a pipeline.

3. The auxiliary electrode device for PFE marine grounding of a cable-laying vessel according to claim 2, characterized in that: The water tank cover is sealed and connected to the upper part of the water tank through a flange. An exhaust valve and symmetrically arranged lifting rings are provided on the water tank cover. A through hole for the power supply assembly to pass through is provided at the center of the water tank cover.

4. The auxiliary electrode device for PFE marine grounding of a cable-laying vessel according to claim 2, characterized in that: The water level control component includes an upper water level pipeline, a water level observation column, a water level scale, a lower water level pipeline and a drain outlet. The ends of the upper water level pipeline and the lower water level pipeline are respectively provided with water level sensors. The water level scale is fixed on the water level observation column. The water level observation column is connected to the water tank through flanges provided on the upper water level pipeline and the lower water level pipeline. The drain outlet is located on one side of the lower water level pipeline.

5. The auxiliary electrode device for PFE marine grounding of a cable-laying vessel according to claim 2, characterized in that: The electrode assembly includes a cable, a stuffing box, a cavity cover, a wiring nose, an insulating sleeve, an insulating heat shrink sleeve and a titanium electrode tube. The end of the cable is connected to a wiring nose. The end of the bent section of the wiring nose is fixedly connected to the head of a stud bolt by a bolt. The stud bolt fixes the electrode assembly to the water tank cover through a connecting assembly.

6. The auxiliary electrode device for PFE marine grounding of a cable-laying vessel according to claim 5, characterized in that: An insulating washer and an insulating sleeve are arranged between the upper end of the stud bolt and the water tank cover in sequence, the end of the stud bolt is located in the titanium electrode tube, an insulating heat shrink sleeve is arranged on the outer side of the upper end of the titanium electrode tube, and a washer is arranged on the outer side of the insulating washer and between the upper end surface of the insulating heat shrink sleeve.

7. The auxiliary electrode device for PFE marine grounding of a cable-laying vessel according to claim 5, characterized in that: The cavity cover is a disc-shaped body with fixed through holes around the bottom. The upper part of the middle of the disc is a hollow cylinder with through holes in the middle of the top and bottom respectively. The stuffing box is fixedly installed through the cylindrical through holes on the top of the cavity cover. The top of the stuffing box is fixedly connected to the cable.

8. The method for using the auxiliary electrode device for PFE marine grounding of a cable-laying vessel according to claim 1, characterized in that: The following steps are involved: Step 1: Install the electrode device on the water inlet valve; Step 2: Connect the cable of the electrode assembly to the PFE isolated power supply; Step 3: Use of auxiliary electrode system S31: Preparation for use Connect one end of the submarine cable to the high voltage output of the PFE isolation power supply on board, i.e. the near end, and the other end, i.e. the far end, to ground at the submarine cable landing station. S32: Injection of seawater Open the exhaust valve and the water inlet control switch, control the injection of seawater into the water tank of the electrode device, and observe the seawater through the water level observation column until the water level upper limit pipeline or the water level scale reaches the upper limit setting value, or when the water level sensor alarms, close the water inlet control switch and the exhaust valve to stop water injection; S33: Entering operation During the construction process, the electrode device enters normal operation; after the construction is completed, the steps are executed; Step 4: Discharge of seawater Open the exhaust valve and control the drain switch on the drain outlet to discharge the seawater in the water tank. When the water level sensor of the lower limit pipeline alarms or the water level scale reaches the lower limit setting value, close the drain switch and exhaust valve on the drain outlet to end this use.

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