A maintenance flushing and burying system for submarine optical cables

Abstract

The present invention discloses a maintenance and burying system for submarine optical cables, comprising: a detection module for detecting faults in the submarine optical cables; a positioning module for accurately positioning the area where the submarine optical cables have faults; and a maintenance module connected to the detection module and the positioning module respectively, for repairing the fault area. The present invention can achieve fault analysis of submarine optical cables, and specifically propose solutions for different types of faults, effectively ensuring that maintenance personnel can troubleshoot faults and perform targeted repairs in the shortest possible time, which is safer and more intelligent, and greatly improves work efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of submarine optical cable maintenance, and particularly relates to a maintenance and burying system for submarine optical cables. Background Art

[0002] Submarine optical cables are generally classified into types such as double-armored, single-armored, lightly armored, and non-armored according to different application environments. Their structures mostly adopt a central tube type. The core is the optical fiber for communication, and the outside is various protective layers and insulating layers. They are laid on the seabed for telecommunication transmission. Modern submarine optical cables all use optical fibers as the transmission medium to transmit voice and data signals. The vast majority of submarine optical cables are directly laid on the seabed. Since they are located on the seabed, detection is relatively difficult.

[0003] With the popularization of the application of submarine optical cables, the problem of damage to submarine optical cables caused by frequent marine fishing activities has become increasingly prominent. Manually repairing damaged submarine optical cables not only takes a long time and has a high repair cost, but also has a high safety risk. Therefore, it is particularly important to always master its burial depth and stress state, and once an abnormal situation is found, be able to repair it in time to prevent the occurrence of vicious events. Summary of the Invention

[0004] To achieve the above object, the present invention provides the following solution: A maintenance and burying system for submarine optical cables, comprising:

[0005] A detection module for detecting faults in the submarine optical cable;

[0006] A positioning module for accurately positioning the area where the submarine optical cable fails;

[0007] A maintenance module, respectively connected to the detection module and the positioning module, for repairing the faulty area.

[0008] Preferably, the maintenance and burying system further includes a data import module, connected to the detection module, for importing marine environment parameters and submarine optical cable parameters into the detection module for comparison with the historical sample data set;

[0009] The marine environment parameters include sea current speed and direction, wind force and direction, and underwater visibility;

[0010] The submarine optical cable parameters include radius length, type, operation years, and number of cores.

[0011] Preferably, the detection module includes a data acquisition unit, a fault prediction unit, and a fault detection unit;

[0012] The data acquisition unit is used to obtain past fault warning data to obtain a historical sample data set;

[0013] The fault prediction unit is used to compare the real-time collected data with the historical sample data to obtain the predicted fault area;

[0014] The fault detection unit is used to detect the predicted fault area to obtain a fault detection result.

[0015] Preferably, the fault detection unit includes a first fault detection unit, a second fault detection unit, and a third fault detection unit;

[0016] The first fault detection unit is used to judge the damage condition of the submarine cable by measuring the change rates of temperature, magnetic flux, and resistance;

[0017] The second fault detection unit is used to classify the degree according to the damage condition to obtain the damage degree of the submarine optical cable;

[0018] The third fault detection unit is used to classify the fault type according to the damage condition to obtain the fault type result of the submarine optical cable.

[0019] Preferably, the fault type result includes a ground fault, an open circuit fault, a low resistance fault, and a high resistance fault.

[0020] Preferably, the positioning module includes a high-voltage fault positioning unit, a low-voltage fault positioning unit, and a fault positioning transmission unit;

[0021] The high-voltage fault positioning unit is used to locate the network fault of the submarine optical cable and survey the cable path;

[0022] The low-voltage fault positioning unit is used to obtain the fault influence range;

[0023] The fault positioning transmission unit is used to locate the cable fault point, update the fault points on the cable path in real time, and transmit the fault location information to the background terminal.

[0024] Preferably, the high-voltage fault positioning unit includes a zero-sequence current acquisition unit, a sheath ground current acquisition unit, a main control unit, and a communication unit arranged on the cable;

[0025] The zero-sequence current acquisition unit, the sheath ground current acquisition unit, and the communication unit are respectively connected to the main control unit;

[0026] The zero-sequence current acquisition unit is connected to the output end of a zero-sequence current transformer arranged at the cable, the sheath ground current acquisition unit is connected to the output end of a sheath ground current transformer arranged at the cable, and the output end of the communication unit is connected to the input end of the fault positioning transmission unit.

[0027] Preferably, the low-voltage fault location unit includes a signal generation unit, a signal modulation unit, a signal processing unit, a voltage isolation unit connected to the cable, a signal coupling unit, and a power amplification unit;

[0028] The output end of the signal generation unit is respectively connected to the input end of the signal modulation unit and the input end of the signal processing unit. The output end of the signal modulation unit is connected to the input end of the voltage isolation unit. The output end of the coupling clamp connected to the cable is connected to the input end of the signal coupling unit. The output end of the signal coupling unit is connected to the input end of the power amplification unit. The output end of the power amplification unit is connected to the input end of the phase modulation unit. The output end of the phase modulation unit is connected to the input end of the signal processing unit. The output end of the signal processing unit is connected to the input end of the communication unit. The output end of the communication unit is connected to the input end of the cable fault push module.

[0029] Preferably, the repair module includes a repair unit and a replacement unit;

[0030] The repair unit is used to repair the submarine optical cable in the fault area to complete the repair;

[0031] The replacement unit is used to cut and replace the submarine optical cable in the fault area.

[0032] The present invention discloses the following technical effects:

[0033] A maintenance and burial system for submarine optical cables provided by the present invention performs fault detection and specific fault analysis on the submarine optical cable based on a detection module, and proposes targeted solutions for different types of faults, effectively ensuring that maintenance personnel can troubleshoot faults and perform targeted repairs in the shortest possible time.

[0034] The accurate positioning of the fault area is achieved through the positioning module. Maintenance personnel can locate the fault point of the target optical cable in the first time. The positioning process is simple and rapid, which is convenient for maintenance personnel to troubleshoot accidents caused by grounding faults, effectively reducing the repair cost of faulty cables and increasing the service life of submarine optical cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] Figure 1 It is a schematic structural diagram of the system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] As Figure 1 shown, the present invention provides a maintenance and burial system for submarine optical cables, including:

[0040] A detection module for detecting faults in submarine optical cables;

[0041] A positioning module for accurately positioning the area where the submarine optical cable fails;

[0042] A maintenance module, connected to the detection module and the positioning module respectively, for maintaining the faulty area.

[0043] The maintenance and burial system further includes a data import module, connected to the detection module, for importing marine environmental parameters and submarine optical cable parameters into the detection module for comparison with the historical sample data set;

[0044] The marine environmental parameters include sea current speed and direction, wind force and direction, and underwater visibility;

[0045] The submarine optical cable parameters include radius length, type, operation years, and number of cores.

[0046] The detection module includes a data acquisition unit, a fault prediction unit, and a fault detection unit;

[0047] The data acquisition unit is used to obtain previous fault warning data and obtain a historical sample data set;

[0048] The fault prediction unit is used to compare the real-time collected data with the historical sample data to obtain a predicted fault area;

[0049] The fault detection unit is used to detect the predicted fault area and obtain a fault detection result.

[0050] The fault detection unit includes a first fault detection unit, a second fault detection unit, and a third fault detection unit;

[0051] The first fault detection unit is used to judge the damage condition of the submarine cable by measuring the change rates of temperature, magnetic flux, and resistance;

[0052] For a further optimized solution, the first fault detection unit includes a resistance measuring device, which obtains the resistance value of the target optical cable based on the resistance measuring device, and judges the fault type of the target optical cable by reading the resistance value indication.

[0053] Obtain the end position of the target faulty optical cable, short-circuit one end, connect the other end to a multimeter, and measure the resistance value of the target faulty optical cable:

[0054] If the resistance value of the multimeter is approximately zero, the target optical cable has a ground fault;

[0055] If the resistance value of the multimeter is infinite, the target optical cable has an open circuit fault;

[0056] If the resistance value of the multimeter does not exceed 1 kΩ, the target optical cable has a low resistance fault;

[0057] If the resistance value of the multimeter exceeds 1 kΩ and is not infinite, the target optical cable has a high resistance fault.

[0058] Based on the measurement data of the target faulty optical cable by the multimeter, for open circuit faults and low resistance faults, the fault area ranging of the target optical cable is as follows: Set time t1, and emit a low voltage pulse based on the low voltage pulse generating device; Set time t2, and obtain the reflected pulse based on the optical cable fault detection device. Then, within the time period from t1 to t2, obtain the full-length reflection of the optical cable; Emit a low voltage pulse based on the low voltage pulse generating device. If within the time period from t1 to t2, there is a time point ta, when at point ta: If the reflected pulse of the target faulty optical cable shows a positive polarity, it is judged as the open circuit fault area; If the reflected pulse of the target faulty optical cable shows a negative polarity, it is judged as the low resistance fault area;

[0059] Based on the measurement data of the target faulty optical cable by the multimeter, for high resistance faults, the fault area ranging of the target optical cable is as follows:

[0060] Emit a high voltage pulse based on the high voltage pulse generating device;

[0061] A reflected pulse is formed when passing through the fault point;

[0062] Obtain the reflected pulse based on the optical cable fault detection device, and calculate the length of the high resistance fault area of the target faulty optical cable by obtaining the propagation speed of the reflected pulse and the time when the reflected pulse is formed.

[0063] The second fault detection unit is used to classify the degree according to the damage situation to obtain the damage degree of the submarine optical cable;

[0064] The second fault detection unit includes a low voltage pulse generating device and a high voltage pulse generating device, and obtains the reflected signal of the fault point by emitting a pulse signal to perform a preliminary ranging of the fault point;

[0065] Based on a multimeter and a low-voltage pulse generating device, obtain the fault area of the target optical cable. The process of obtaining the grounding fault point of the target optical cable is as follows:

[0066] Based on an audio current generating device, transmit an audio current signal through the target faulty optical cable, and after passing through the fault point, the reflected current flows back to the power supply;

[0067] According to the electromagnetic coupling effect, an induced current is generated in the target optical cable, forming a ground magnetic field;

[0068] By using a coil to detect along the direction of the target optical cable, the position where the obtained signal significantly weakens or interrupts is the location of the fault point.

[0069] Based on a multimeter and a low-voltage pulse generating device, obtain the fault area of the target optical cable. The process of obtaining the low-resistance fault point of the target optical cable is as follows:

[0070] Electrically connect the DC generating device to the target optical cable;

[0071] Transmit a DC current to the target optical cable through the DC generating device. The current is guided through the target optical cable; it enters the ground through the fault point; and it spreads in the ground in the directions of both ends of the target optical cable with the fault point as the center, forming a potential difference;

[0072] Based on the determined range of the fault area of the target optical cable, detect the potential difference in the fault area of the target optical cable through a step voltage detection device;

[0073] Based on the fact that the potential difference directions before and after the fault point of the target optical cable are opposite, and the potential difference directly above the fault point is zero, the place where the step voltage detection device detects a zero potential difference is the location of the fault point of the target optical cable.

[0074] The step voltage detection device includes two probes for contacting the ground and a voltmeter for measuring the potential difference; the two probes are connected in an A-shaped structure, with the upper ends closed and the lower ends open with a fixed width, and both ends of the voltmeter are electrically connected between the two probes; move the constructed step voltage detection device along the direction of the target optical cable until a place where the detected potential difference is zero is reached, which is the location of the fault point of the target optical cable.

[0075] Based on a multimeter and a high-voltage pulse generating device, obtain the fault area of the target optical cable. The process of obtaining the high-resistance fault point of the target optical cable is as follows:

[0076] Based on the high-voltage pulse generating device, apply a high-voltage pulse to the target optical cable for discharging;

[0077] The fault point discharges through the optical cable to generate a sound signal, and the discharging current forms a pulse magnetic field along the direction of the optical cable;

[0078] Based on the different propagation speeds of sound signals and magnetic field signals, a sound-magnetic synchronous receiving device is used to receive the sound and magnetic field signals generated during the discharge process;

[0079] If, during the receiving process by the sound-magnetic synchronous receiving device, a point with the smallest capture time difference between the sound signal and the magnetic field signal is obtained, then this point is the fault point.

[0080] The third fault detection unit is used to classify the fault types according to the damage situation to obtain the fault type result of the submarine optical cable.

[0081] The positioning module includes a high-voltage fault positioning unit, a low-voltage fault positioning unit, and a fault positioning transmission unit;

[0082] The high-voltage fault positioning unit is used to locate the network faults of the submarine optical cable and survey the cable path;

[0083] The low-voltage fault positioning unit is used to obtain the fault influence range;

[0084] The fault positioning transmission unit is used to locate the cable fault point, update the fault points on the cable path in real time, and transmit the fault location information to the background terminal.

[0085] The high-voltage fault positioning unit includes a zero-sequence current acquisition unit, a sheath ground current acquisition unit, a main control unit, and a communication unit arranged on the cable;

[0086] The zero-sequence current acquisition unit, the sheath ground current acquisition unit, and the communication unit are respectively connected to the main control unit;

[0087] The zero-sequence current acquisition unit is connected to the output end of the zero-sequence current transformer arranged on the cable, the sheath ground current acquisition unit is connected to the output end of the sheath ground current transformer arranged on the cable, and the output end of the communication unit is connected to the input end of the fault positioning transmission unit.

[0088] The low-voltage fault positioning unit includes a signal generation unit, a signal modulation unit, a signal processing unit, a voltage isolation unit connected to the cable, a signal coupling unit, and a power amplification unit;

[0089] The output end of the signal generation unit is respectively connected to the input ends of the signal modulation unit and the signal processing unit, the output end of the signal modulation unit is connected to the input end of the voltage isolation unit, the output end of the coupling clamp connected to the cable is connected to the input end of the signal coupling unit, the output end of the signal coupling unit is connected to the input end of the power amplification unit, the output end of the power amplification unit is connected to the input end of the phase modulation unit, the output end of the phase modulation unit is connected to the input end of the signal processing unit, the output end of the signal processing unit is connected to the input end of the communication unit, and the output end of the communication unit is connected to the input end of the cable fault push module.

[0090] For a further optimized solution, the positioning module includes an audio current generating device, a DC generating device, a step voltage detecting device, and an acoustic-magnetic synchronous receiving device, which are used to accurately locate the fault point for the preliminarily detected fault area.

[0091] The maintenance module includes a repair unit, a replacement unit, and a cleaning unit;

[0092] The repair unit is used to repair the submarine optical cable in the fault area to complete the repair;

[0093] The replacement unit is used to cut and replace the submarine optical cable in the fault area.

[0094] The system further includes an adjustment module for adjustment by measuring the depth and temperature changes of the submarine optical cable to intelligently adjust and protect the submarine optical cable; a protection module for detecting and driving away organisms and objects close to the submarine optical cable by means of sound waves and vibrations; a storage module for storing the repair process and analyzing the cause of the submarine cable damage by detecting the damaged part; a central processing module for analyzing and processing by obtaining the information of the above detection module, cleaning module, and storage module to form corresponding instructions to control the robot for underwater repair and processing.

[0095] The adjustment module includes a depth unit and a temperature unit. The depth unit is used to measure the depth of the optical cable by pressure and adjust the depth of the optical cable by adjusting the airbag and water storage. The temperature unit is used to measure the temperature of the optical cable and adjust the temperature of the optical cable by a refrigeration and heating device.

[0096] The protection module includes a sound wave unit and a vibration unit. The sound wave unit is used to measure the objects close to the optical cable by sound waves and drive away the objects by adjusting the frequency of the sound waves. The vibration unit is used to sense the objects by the vibration of the sea water and the optical cable and avoid the objects by changing the height of the optical cable.

[0097] The storage module is used to record the process of optical cable maintenance and judge the cause of optical cable damage by detecting the environment and damage degree of the damaged part of the optical cable.

[0098] The central processing module judges the optical cable maintenance method by analyzing the information of the storage module and the detection module, judges by the information of the detection module, draws a three-dimensional image, and confirms the location of the damaged part for repair in the form of coordinates.

[0099] For a further optimized solution, the specific structure of the maintenance module includes a side housing and a connecting top plate installed at the top of the side housing. Inside the side housing and at the bottom of the connecting top plate, there is a floating gas storage assembly. At the bottom of the floating gas storage assembly, there is a lifting assembly installed, and at one end of the lifting assembly away from the connecting top plate, there is an earth excavation assembly. When the lifting assembly operates, it simultaneously drives the earth excavation assembly to move downward and turn the soil. At the bottom of the inner wall of the side housing, there is an arc-shaped limiting rod installed through a fixed arm. At the inner wall of the side housing near the arc-shaped limiting rod, there is a welded maintenance driving assembly installed. On the arc-shaped limiting rod, there is a welding assembly driven by the welded maintenance driving assembly to slide on the arc-shaped limiting rod. At both sides of the bottom of the side housing, there are rotating rods installed through the first bearings. At both ends of the rotating rods, there are supporting wheels that can rotate around the axis of the rotating rods. At both ends of the supporting wheels, there are guide covers installed. Inside the guide covers, there are screw propellers and a driving assembly for driving the screw propellers to move. In the middle of both sides of the side housing, a first guiding water pump and a second guiding water pump are respectively installed. In the middle of the four sides of the side housing, there are four-sided scanning sonars respectively installed. At the bottom of the side housing, a shallow layer profiler and a depth sounder are installed. Inside the side housing, a central processor and low-voltage control components are also installed.

[0100] For a further optimized solution, the floating gas storage assembly includes a gas storage chamber installed at the bottom of the connecting top plate. At the top of one side of the gas storage chamber, there is an air pump installed. The air pump is connected to a connecting hose. In the middle of the top of the connecting top plate, there is a top cover installed, and inside the top cover, there is an airbag. The connecting hose is connected to the airbag. The lifting assembly is installed at the bottom of the gas storage chamber.

[0101] For a further optimized solution, the lifting assembly includes a connecting top plate installed at the bottom of the gas storage chamber. At the middle position at the bottom of the connecting top plate, there is a second driving motor installed. Outside the second driving motor, there is a sleeve installed. At both sides of the sleeve, there are first connecting rods welded. At the bottom of the first connecting rods, there are second connecting rods installed. The second connecting rods are installed with rotating rods through the second bearings. At the bottom of the first threaded rod, there is an inner sliding rod installed. Outside the inner sliding rod, there is an outer tube installed. At the bottom of the outer tube, there is a first bevel gear installed. Outside the first bevel gear, there is a second bevel gear meshed. The rotating rod passes through the second bevel gear. The earth excavation assembly is installed at both ends of the second bevel gear.

[0102] For a further optimized solution, at both ends of the rotating rod, there are connecting plates installed. Along the axial direction of the connecting plates, multiple groups of second connecting rods are installed at equal intervals outside the connecting plates. At the end of the outside of the second connecting rods away from the second bearing, there is a first connecting rod hinged. Inside the first connecting rod, there is an earth excavation bin hinged. In the middle of the outside of the first connecting rod, there is a first fixing plate installed. On the side of the first fixing plate facing the earth excavation bin, multiple groups of buffer springs are installed. At the end of the buffer springs away from the first fixing plate, they are installed on the outside of the earth excavation bin.

[0103] For a further optimized solution, the welding assembly includes a sliding sleeve sleeved outside the arc-shaped limiting rod. A second fixed plate is installed at the inner bottom of the sliding sleeve. The top of the second fixed plate is connected to the welding repair driving assembly. A welding buffer assembly is installed at the bottom of the second fixed plate, and a welding cross movement assembly is installed through the welding buffer assembly.

[0104] For a further optimized solution, the welding repair driving assembly includes a first driving motor installed at the bottom on one side of the side shell. A rotating shaft is installed at the output end of the first driving motor. A driving turntable is installed at the end of the rotating shaft away from the first driving motor. A second hinge rod is hinged near the outer ring part on the side of the driving turntable facing away from the first driving motor. The bottom of the second hinge rod is hinged to the top of the second fixed plate.

[0105] For a further optimized solution, the welding buffer assembly includes U-shaped connecting arms installed at the four corners of the top of the second fixed plate. A buffer spring is installed at the end of the U-shaped connecting arm away from the second fixed plate. A side fixed plate is installed at the bottom of the buffer spring.

[0106] For a further optimized solution, the welding cross movement assembly includes a third driving motor installed in the middle on one side of the side fixed plate. A second threaded rod penetrating through the middle inside the other set of side fixed plates is installed at the output end of the third driving motor. A third limit slider is sleeved outside the second threaded rod. A connecting plate is installed at the top of the third limit slider, and a first limit slider is installed through the connecting plate. First limit slide bars are installed at both ends inside the side fixed plate, and the first limit slide bars penetrate through the first limit slider. A fourth driving motor is installed in the middle on one side of the first limit slider. A third threaded rod is installed at the output end of the fourth driving motor. A second limit slider is sleeved outside the third threaded rod. A welding rod is installed at the top of the second limit slider. A crack detector is installed outside the second limit slider.

[0107] For a further optimized solution, a second limit slide bar penetrating through the second limit slider is installed inside the first limit slider. Limit bars are installed on both sides of the bottom of the connecting top plate, and the limit bars penetrate through the first connecting rod. A drain pipe is opened at the top of the connecting top plate, and the second guiding water pump is communicated with the drain pipe through a connecting pipe.

[0108] The above-described embodiments are only descriptions of the preferred modes of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A maintenance scouring and burying system for submarine optical cables, characterized in that, Including: A detection module for fault detection of submarine optical cables; A positioning module for accurately positioning the area where the submarine optical cable fails; A repair module connected to the detection module and the positioning module respectively for repairing the fault area; The repair and burial system of the submarine optical cable further includes a data import module, connected to the detection module, for importing marine environment parameters and submarine optical cable parameters into the detection module for comparison with the historical sample data set; The marine environment parameters include sea current speed and direction, wind force and direction, and underwater visibility; The submarine optical cable parameters include radius length, type, operation years, and number of cores; The detection module includes a data acquisition unit, a fault prediction unit, and a fault detection unit; The data acquisition unit is used to obtain past fault warning data to obtain a historical sample data set; The fault prediction unit is used to compare the real-time collected data with the historical sample data to obtain a predicted fault area; The fault detection unit is used to detect the predicted fault area to obtain a fault detection result; The positioning module includes a high-voltage fault positioning unit, a low-voltage fault positioning unit, and a fault positioning transmission unit; The high-voltage fault positioning unit is used to locate the network fault of the submarine optical cable and survey the cable path; The low-voltage fault positioning unit is used to obtain the fault influence range; The fault positioning transmission unit is used to locate the cable fault point, update the fault points on the cable path in real time, and transmit the fault location information to the background terminal; The repair module includes a repair unit and a replacement unit; The repair unit is used to repair the submarine optical cable in the fault area to complete the repair; The replacement unit is used to cut and replace the submarine optical cable in the fault area.

2. The repair and burial system of the submarine optical cable according to claim 1, characterized in that The fault detection unit includes a first fault detection unit, a second fault detection unit, and a third fault detection unit; The first fault detection unit is used to judge the damage condition of the submarine cable by measuring the change rates of temperature, magnetic flux, and resistance; The second fault detection unit is used to classify the degree according to the damage condition to obtain the damage degree of the submarine optical cable; The third fault detection unit is used to classify the fault type according to the damage condition to obtain the fault type result of the submarine optical cable.

3. The repair and burial system of the submarine optical cable according to claim 2, characterized in that The fault type result includes ground fault, open circuit fault, low resistance fault, and high resistance fault.

4. The repair and burial system of the submarine optical cable according to claim 1, characterized in that The high-voltage fault positioning unit includes a zero-sequence current acquisition unit, a sheath ground current acquisition unit, a main control unit, and a communication unit arranged on the cable; The zero-sequence current acquisition unit, the sheath ground current acquisition unit, and the communication unit are respectively connected to the main control unit; The zero-sequence current acquisition unit is connected to the output end of the zero-sequence current transformer arranged at the cable, the sheath ground current acquisition unit is connected to the output end of the sheath ground current transformer arranged at the cable, and the output end of the communication unit is connected to the input end of the fault location transmission unit.

5. The maintenance and burial system for submarine optical cable according to claim 1, wherein the low-voltage fault location unit includes a signal generation unit, a signal modulation unit, a signal processing unit, a voltage isolation unit connected to the cable, a signal coupling unit, and a power amplification unit; the output end of the signal generation unit is respectively connected to the input end of the signal modulation unit and the input end of the signal processing unit, the output end of the signal modulation unit is connected to the input end of the voltage isolation unit, the output end of the coupling clamp connected to the cable is connected to the input end of the signal coupling unit, the output end of the signal coupling unit is connected to the input end of the power amplification unit, the output end of the power amplification unit is connected to the input end of the phase modulation unit, the output end of the phase modulation unit is connected to the input end of the signal processing unit, the output end of the signal processing unit is connected to the input end of the communication unit, and the output end of the communication unit is connected to the input end of the cable fault push module.

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