Photoelectric combined submarine cable fault detection equipment and detection method

Abstract

The invention provides photoelectric combined submarine cable fault detection equipment and a photoelectric combined submarine cable fault detection method, and belongs to the technical field of submarine cable fault detection. The photoelectric combined submarine cable fault detection equipment comprises a main machine body, a high-voltage device, a sampler and a coupler, wherein the main machine body comprises a fault diagnosis module, and an optical pulse module and a low-voltage pulse module which are electrically connected with the fault diagnosis module; the high-voltage device comprises a high-voltage pulse module; the sampler is used for being electrically connected with the fault diagnosis module and collecting current signals going back and forth on the submarine cable to be detected. The coupler is used for being electrically connected with the fault diagnosis module, the low-voltage pulse module, the high-voltage pulse module and the submarine cable to be tested; the fault diagnosis module is used for collecting the optical pulse returned by the submarine cable to be detected, and the low-voltage pulse and the current signal which go back and forth to the submarine cable to be detected, so as to determine the comprehensive fault information of the submarine cable to be detected. According to the invention, the comprehensive fault information of the to-be-detected submarine cable is determined by combining the mechanical fault information and the electrical fault information of the to-be-detected submarine cable, so that the misjudgment rate of the to-be-detected submarine cable fault is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of submarine cable fault detection, and in particular to a submarine cable fault detection device and method combining optical and electrical detection. BACKGROUND

[0002] In a power system, submarine cables are the key power transmission channels for offshore wind power development and island power supply. The development of offshore wind power industry requires a large amount of submarine cable transmission of electric energy to ensure coastal power supply, and island power supply also depends on submarine cables, which makes the importance of submarine cables increasing.

[0003] Submarine cables are in a complex marine environment, affected by natural factors such as seawater corrosion, sea current impact, and geological changes, as well as threats from human activities such as ship anchoring, fishing activities, and marine engineering construction, which can easily cause submarine cable faults. Once a submarine cable fault occurs, it will interrupt power supply, causing huge economic losses to power companies and seriously affecting coastal industrial production and residents' lives. Therefore, it is of great significance to carry out submarine cable fault monitoring research to ensure the safe and stable operation of the power system and improve power supply reliability. In related technologies, off-line positioning devices or online monitoring systems are used for submarine cable fault monitoring.

[0004] Among them, there are two types of off-line positioning devices. One mainly uses single technologies such as acoustic measurement, magnetic vector method, and low-voltage pulse method, and the other uses wideband impedance spectrum or low-voltage pulse fault positioning method, which has relatively high indicators such as measurement accuracy, measurement range, and reliability, but still has positioning errors of hundreds of meters in actual application, and the human-machine interface is poor. Both of the above two detection methods belong to the analysis of single feature quantity, and have the disadvantages of large fault diagnosis error.

[0005] As a fixed monitoring device, the online monitoring system uses distributed optical fiber sensing technology, and its technical route focuses on the collection and analysis of light intensity or amplitude, and generally has high sensitivity to changes in mechanical properties such as submarine cable vibration and temperature. However, the optical fiber sensor must be installed synchronously with the submarine cable, and only has fault judgment means of optical fiber technology, which cannot detect the disconnected cable offline. In addition, the online monitoring system uses the latitude and longitude of the construction ship during submarine cable laying to perform synchronous positioning, without considering the changes caused by factors such as ocean current scouring and ship hooking and dragging.

[0006] Therefore, a new scheme is needed to solve the above technical problems. SUMMARY

[0007] The present application provides a submarine cable fault detection device and method combining optical and electrical detection to solve the technical problem of poor positioning and detection accuracy of submarine cable fault points caused by using single detection technology in related technologies.

[0008] The application provides a photoelectric combined submarine cable fault detection device, which comprises a main body, a high-voltage device, a sampler and a coupler, the main body comprises a fault diagnosis module, and an optical pulse module and a low-voltage pulse module electrically connected with the fault diagnosis module, the optical pulse module is used for sending an optical pulse to a submarine cable to be detected, and the low-voltage pulse module is used for sending a low-voltage pulse to the submarine cable to be detected; the high-voltage device comprises a high-voltage pulse module, the high-voltage pulse module is used for sending a high-voltage pulse to the submarine cable to be detected; the sampler is electrically connected with the fault diagnosis module and is used for collecting current signals that are transmitted back and forth on the submarine cable to be detected, so as to send the current signals to the fault diagnosis module; the coupler is electrically connected with the fault diagnosis module, the low-voltage pulse module, the high-voltage pulse module and the submarine cable to be detected, the low-voltage pulse module sends a low-voltage pulse to the submarine cable to be detected through the coupler, the fault diagnosis module is used for collecting the low-voltage pulse returned by the submarine cable to be detected through the coupler, and the high-voltage pulse module sends a high-voltage pulse to the submarine cable to be detected through the coupler; wherein the fault diagnosis module collects the optical pulse returned by the submarine cable to be detected, the low-voltage pulse and the current signals that are transmitted back and forth on the submarine cable to be detected, so as to determine comprehensive fault information of the submarine cable to be detected.

[0009] In an embodiment of the application, the fault diagnosis module is used for collecting the optical pulse returned by the submarine cable to be detected, and the low-voltage pulse and the current signals that are transmitted back and forth on the submarine cable to be detected, so as to determine mechanical fault information and electrical fault information of the submarine cable to be detected.

[0010] In an embodiment of the application, the optical pulse output interface and the submarine cable to be detected are connected through a first connecting line, and the low-voltage pulse output interface and the submarine cable to be detected are connected through a second connecting line.

[0011] In an embodiment of the application, the sampler is connected with the low-voltage pulse output interface, so as to electrically connect the sampler with the fault diagnosis module.

[0012] In an embodiment of the application, the main body further comprises an operation display screen electrically connected with the fault diagnosis module, the optical pulse module and the low-voltage pulse module, the operation display screen is used for adjusting parameters of the optical pulse sent by the optical pulse module, adjusting parameters of the low-voltage pulse sent by the low-voltage pulse module, and displaying the comprehensive fault information.

[0013] In an embodiment of the application, the operation display screen is arranged on the first shell and is located on the upper surface of the first shell.

[0014] In an embodiment of the application, the main body further comprises a heat dissipation structure, and the heat dissipation structure is arranged on the first shell.

[0015] In an embodiment of the present application, the first shell is further provided with a first key, a reset key, a first power interface and a first grounding structure.

[0016] In an embodiment of the present application, the high-voltage device further comprises a second shell, the high-voltage pulse module is located inside the second shell, and the second shell is provided with a high-voltage pulse output interface electrically connected with the high-voltage pulse module.

[0017] In an embodiment of the present application, the high-voltage pulse output interface and the to-be-tested submarine cable are connected through a third connecting line, and a sampling end of the sampler is arranged in parallel with the third connecting line.

[0018] In an embodiment of the present application, the first end of the coupler is connected with the low-voltage pulse output interface, the second end of the coupler is connected with the high-voltage pulse output interface, the third end of the coupler is connected with the to-be-tested submarine cable, and the fourth end of the coupler is grounded.

[0019] In an embodiment of the present application, the high-voltage device further comprises a voltage regulating knob, an ammeter and a voltmeter arranged on the second shell, the voltage regulating knob is used for adjusting the voltage value output by the high-voltage pulse module, the voltmeter is used for displaying the voltage value output by the high-voltage pulse module, and the ammeter is used for detecting the current value applied to the loop of the to-be-tested submarine cable.

[0020] In an embodiment of the present application, the second shell is further provided with a second key, a pause key, an emergency stop key, a discharge key, a discharge timer, a second grounding structure and a second power interface.

[0021] In an embodiment of the present application, the optoelectrical combined submarine cable fault detection device further comprises a shell, the main body and the high-voltage device are located in the shell, and the bottom of the shell is provided with a moving wheel, and the outer side wall of the shell is provided with a pull rod structure.

[0022] In an embodiment of the present application, the shell is provided with a door plate, and the main body and the high-voltage device are put into or taken out of the shell through the door plate.

[0023] In an embodiment of the present application, the shell is provided with a partition plate, the partition plate can be extended out of the shell or withdrawn into the shell, the main body is placed on the partition plate, and the high-voltage device is placed below the partition plate.

[0024] The present application also provides an optoelectrical combined submarine cable fault detection method, which adopts the optoelectrical combined submarine cable fault detection device of any one of the above-mentioned embodiments to detect a to-be-tested submarine cable, and the method comprises the following steps:

[0025] connecting the to-be-tested submarine cable to the main body;

[0026] controlling the light pulse module to send continuous light pulses to the to-be-tested submarine cable, and controlling the low-voltage pulse module to send low-voltage pulses to the to-be-tested submarine cable;

[0027] controlling the fault diagnosis module to collect the light pulses returned through the to-be-tested submarine cable, and determining mechanical fault information of the to-be-tested submarine cable according to the light pulses; and controlling the fault diagnosis module to collect the low-voltage pulses to and from the to-be-tested submarine cable, and determining electrical fault information of the to-be-tested submarine cable according to the low-voltage pulses;

[0028] connecting the to-be-tested submarine cable to the high-voltage device, and connecting the sampler to the main body;

[0029] controlling the high-voltage pulse module to send high-voltage pulses to the to-be-tested submarine cable, and controlling the sampler to collect current signals to and from the to-be-tested submarine cable after arc discharge breakdown occurs at the fault point of the to-be-tested submarine cable, and sending the current signals to the fault diagnosis module;

[0030] controlling the fault diagnosis module to determine the electrical fault information according to the current signals;

[0031] connecting the coupler to the main body, the high-voltage device and the to-be-tested submarine cable simultaneously;

[0032] controlling the high-voltage pulse module to send high-voltage pulses to the to-be-tested submarine cable, and controlling the low-voltage pulse module to send low-voltage pulses to the to-be-tested submarine cable after arc discharge breakdown occurs at the fault point of the to-be-tested submarine cable, and controlling the fault diagnosis module to collect the low-voltage pulses returned through the to-be-tested submarine cable; after the arc of the to-be-tested submarine cable is extinguished, controlling the low-voltage pulse module to send low-voltage pulses to the to-be-tested submarine cable again, and controlling the fault diagnosis module to collect the low-voltage pulses returned through the to-be-tested submarine cable;

[0033] controlling the fault diagnosis module to determine the electrical fault information according to the low-voltage pulses returned twice by the to-be-tested submarine cable;

[0034] controlling the fault diagnosis module to determine comprehensive fault information of the to-be-tested submarine cable according to the determined mechanical fault information and electrical fault information.

[0035] In an embodiment of the present application, the to-be-tested submarine cable is connected to the main body, which comprises:

[0036] the light pulse output interface of the main body is connected to the to-be-tested submarine cable through a first connecting line, and the low-voltage pulse output interface of the main body is connected to the to-be-tested submarine cable through a second connecting line.

[0037] In an embodiment of the present application, the submarine cable to be tested is connected to the high-voltage device, and a sampler is connected to the main body, comprising:

[0038] The high-voltage pulse output interface of the high-voltage device is connected to the submarine cable to be tested through a third connecting line;

[0039] The sampler is connected to the low-voltage pulse output interface of the main body, and the sampling end of the sampler is placed in parallel with the third connecting line.

[0040] In an embodiment of the present application, a coupler is connected to the main body, the high-voltage device and the submarine cable to be tested, comprising:

[0041] The first end of the coupler is connected to the low-voltage pulse output interface of the main body, the second end of the coupler is connected to the high-voltage pulse output interface of the high-voltage device, and the third end of the coupler is connected to the submarine cable to be tested.

[0042] In an embodiment of the present application, the method further comprises discharging the loop of the high-voltage device after the fault detection of the submarine cable to be tested is completed by the high-voltage device.

[0043] The application has the following beneficial effects: the photoelectric combined submarine cable fault detection device and method can send continuous light pulses to the submarine cable to be detected through the light pulse module of the main body, and the light pulses form back Rayleigh scattering light when encountering scattering points in the propagation process of the optical cable. The back Rayleigh scattering light returns to the fault diagnosis module as returned light pulses, and the fault diagnosis module determines the mechanical fault information of the submarine cable to be detected according to the returned light pulses. The low-voltage pulse module of the main body sends low-voltage pulses to the submarine cable to be detected, and the low-voltage pulses produce reflections when encountering impedance mismatch points such as low resistance, open circuit faults, etc. in the submarine cable to be detected. The reflected low-voltage pulses return to the fault diagnosis module, and the fault diagnosis module determines the electrical fault information of the submarine cable to be detected according to the low-voltage pulses that go back and forth in the submarine cable to be detected. The high-voltage pulse module of the high-voltage device sends high-voltage pulses to the submarine cable to be detected to break down the fault points of the submarine cable to be detected. When the fault points of the submarine cable to be detected are broken down, and the arc discharge changes from a high resistance state to a low resistance or short circuit state, the current signals that go back and forth in the submarine cable to be detected are collected by the sampler and sent to the fault diagnosis module, so that the fault diagnosis module determines the electrical fault information of the submarine cable to be detected according to the current signals. The main body, the high-voltage device and the submarine cable to be detected are connected through the coupler. After the high-voltage pulse module sends high-voltage pulses to break down the fault points of the submarine cable to be detected and change the high resistance state to a low resistance or short circuit state, the low-voltage pulse module sends low-voltage pulses to the submarine cable to be detected, and the fault diagnosis module collects the returned low-voltage pulses. When the arc of the submarine cable to be detected extinguishes and returns to a high resistance state, the low-voltage pulse module sends low-voltage pulses to the submarine cable to be detected again, and the fault diagnosis module collects the returned low-voltage pulses again. The fault diagnosis module determines the electrical fault information of the submarine cable to be detected according to the two returned low-voltage pulses. The application can determine the electrical fault information of the submarine cable to be detected in multiple ways, and determine the comprehensive fault information of the submarine cable to be detected by combining the mechanical fault information and the electrical fault information of the submarine cable to be detected, which is beneficial to distinguishing the fault type of the submarine cable to be detected and reducing the misjudgment rate of the submarine cable fault. BRIEF DESCRIPTION OF DRAWINGS

[0044] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application. It is apparent that the accompanying drawings are only some embodiments of the present application, and other drawings can be obtained from the drawings without creative labor for those skilled in the art.

[0045] In the drawings:

[0046] Figure 1 The structure diagram of the photoelectric combined submarine cable fault detection device provided by an embodiment of the application is shown.

[0047] Figure 2 is a structural schematic view of a host body provided in an embodiment of the present application;

[0048] Figure 3 is another perspective structural schematic view of a host body provided in an embodiment of the present application;

[0049] Figure 4 is a structural schematic view of a high-voltage device provided in an embodiment of the present application.

[0050] The reference signs are as follows:

[0051] 1 - host body; 11 - first housing; 111 - optical pulse output interface; 112 - low-voltage pulse output interface; 113 - first key; 114 - reset key; 115 - first power supply interface; 116 - first grounding structure; 117 - wifi interface; 118 - USB interface; 119 - indicator light; 12 - operation display screen; 13 - heat dissipation structure;

[0052] 2 - high-voltage device; 21 - second housing; 211 - high-voltage pulse output interface; 212 - ammeter; 213 - voltmeter; 22 - voltage regulating knob; 23 - second key; 24 - pause key; 25 - emergency stop key; 26 - discharge key; 27 - discharge timer; 28 - second grounding structure; 29 - second power supply interface;

[0053] 3 - shell; 31 - moving wheel; 32 - pull rod structure; 33 - door plate; 34 - partition plate; 35 - wire hole. DETAILED DESCRIPTION

[0054] The embodiments of the present application will be described in detail with specific reference felt to the drawings. The skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. The present application can also be implemented or applied by other different embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0055] It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of the present application, and the drawings only show the components related to the present application without drawing the number, shape and size of the components in actual implementation. The type, number and ratio of the components in actual implementation can be randomly changed, and the layout type of the components can be more complex.

[0056] In the following description, numerous specific details are discussed in order to provide a thorough understanding of the embodiments of the application. However, those skilled in the art will recognize that the embodiments of the application can be practiced without these specific details. In other instances, well-known structures and devices are not described in detail in order to avoid obscuring the embodiments of the application.

[0057] See Figure 1 , Figure 1 The photoelectric combined submarine cable fault detection device provided by the embodiment of the application comprises a main body 1, a high-voltage device 2, a sampler and a coupler. The main body 1 comprises a fault diagnosis module, an optical pulse module and a low-voltage pulse module, wherein the optical pulse module and the low-voltage pulse module are electrically connected with the fault diagnosis module; the high-voltage device 2 comprises a high-voltage pulse module.

[0058] In the process of detecting the fault of the submarine cable to be detected, the mechanical fault detection of the submarine cable to be detected can adopt an optical pulse detection method. The optical pulse detection method specifically comprises that the optical pulse module of the main body 1 sends an optical pulse to the optical cable of the submarine cable to be detected. When the optical pulse propagates in the optical cable, a back Rayleigh scattering light is formed when the optical pulse encounters a scattering point, and the back Rayleigh scattering light is collected by the fault diagnosis module as the optical pulse returned by the optical cable.

[0059] The fault diagnosis module calculates the phase difference between the two ends of the vibration section of the optical cable according to the optical pulse returned by the submarine cable to be detected, realizes the quantitative measurement of the stretching or strain of the optical cable, and further obtains the intensity of the vibration signal. At the same time, the time domain and frequency domain information of the vibration signal can be obtained, and more accurate identification and positioning of the vibration signal can be realized.

[0060] Since the mechanical fault of the submarine cable to be detected often brings strain and vibration to the optical cable of the submarine cable to be detected, and even causes the rupture of the optical cable, therefore, by detecting the distributed strain and vibration of the optical cable, the breakpoint and the position of the deterioration of the attenuation of the optical cable can be detected, and the running state of the submarine cable to be detected can be detected, and the mechanical fault information of the submarine cable to be detected can be obtained. And the shorter the optical pulse sent by the optical pulse module to the submarine cable to be detected, the higher the positioning accuracy of the fault point of the optical cable.

[0061] The electrical fault detection of the submarine cable to be detected can adopt a low-voltage pulse detection method. The low-voltage pulse detection method specifically comprises that the low-voltage pulse module of the main body 1 sends a low-voltage pulse to the submarine cable to be detected, and the fault diagnosis module collects the sent low-voltage pulse. The low-voltage pulse propagates along the length direction of the submarine cable to be detected, and when it encounters an impedance mismatch point such as a low resistance, an open circuit fault, etc., a reflection is generated, and the reflected low-voltage pulse is returned to the main body 1 along the length direction of the submarine cable to be detected and is collected by the fault diagnosis module.

[0062] The fault diagnosis module calculates the distance of the fault point of the submarine cable to be tested according to the interval time of the low-voltage pulse before and after the low-voltage pulse transmits to and fro the submarine cable to be tested, and the transmission speed of the low-voltage pulse in the submarine cable to be tested is known, so as to obtain the electrical fault information of the submarine cable to be tested.

[0063] When the fault point of the submarine cable to be tested is in a high-resistance state, the low-voltage pulse module cannot detect the fault point of the submarine cable to be tested, and the high-voltage device 2, the sampler and the coupler need to be applied.

[0064] The electrical fault detection of the submarine cable to be tested can also adopt a high-voltage pulse current detection method. Before the high-voltage pulse current detection method is implemented, the sampler is electrically connected with the fault diagnosis module of the main body 1.

[0065] The high-voltage pulse current detection method specifically sends a high-voltage pulse to the submarine cable to be tested through the high-voltage pulse module of the high-voltage device 2, the high-voltage pulse propagates along the length direction of the submarine cable to be tested, so as to break through the fault point of the submarine cable to be tested by the high-voltage pulse, and the fault point changes from a high-resistance state to a low-resistance or short-circuit state. The current flows from the high-voltage device 2 to the submarine cable to be tested to form a loop, and then returns to the high-voltage device 2. The sampler collects the signal of the current to and fro, and sends the signal to the fault diagnosis module of the main body 1. The fault diagnosis module can calculate the distance of the fault point of the submarine cable to be tested according to the interval time of the current signal before and after the current signal transmits to and fro the submarine cable to be tested, and the transmission speed of the current signal in the submarine cable to be tested is known, so as to obtain the electrical fault information of the submarine cable to be tested.

[0066] The electrical fault detection of the submarine cable to be tested can also adopt an electrical echo reflection detection method. Before the electrical echo reflection detection method is implemented, the coupler is electrically connected with the low-voltage pulse module and the fault diagnosis module of the main body 1, the high-voltage pulse module of the high-voltage device 2, and the submarine cable to be tested.

[0067] The electrical echo reflection detection method specifically sends a high-voltage pulse to the submarine cable to be tested through the high-voltage pulse module of the high-voltage device 2 via the coupler, the high-voltage pulse propagates along the length direction of the submarine cable to be tested, so as to break through the fault point of the submarine cable to be tested by the high-voltage pulse, and the fault point generates arc discharge to change from a high-resistance state to a low-resistance or short-circuit state. Subsequently, a low-voltage pulse is sent to the submarine cable to be tested through the low-voltage pulse module of the main body 1 via the coupler, the low-voltage pulse propagates along the length direction of the submarine cable to be tested, and the low-voltage pulse generates reflection when the low-voltage pulse travels to the fault point in a low-resistance or short-circuit state. The reflected low-voltage pulse returns to the main body 1 along the length direction of the submarine cable to be tested via the coupler, and is collected by the fault diagnosis module.

[0068] After the arc of the to-be-tested submarine cable is extinguished and returns to a high resistance state, the low-voltage pulse module sends a low-voltage pulse to the to-be-tested submarine cable through the coupler again, the low-voltage pulse travels to the end of the to-be-tested submarine cable away from the low-voltage pulse module and returns, the low-voltage pulse returned through the to-be-tested submarine cable is transmitted to the host body 1 through the coupler again and is collected by the fault diagnosis module. The fault diagnosis module compares the low-voltage pulses returned through the to-be-tested submarine cable collected before and after, determines the fault point position of the to-be-tested submarine cable, and thus the interval time between the fault point position and the low-voltage pulse sending end can be obtained, and the distance of the fault point of the to-be-tested submarine cable can be calculated, so that the electrical fault information of the to-be-tested submarine cable can be obtained.

[0069] The photoelectric combined submarine cable fault detection device can determine the electrical fault information of the to-be-tested submarine cable in multiple ways, and determine the comprehensive fault information of the to-be-tested submarine cable by combining the mechanical fault information and the electrical fault information, which is beneficial to distinguish the fault type of the to-be-tested submarine cable and reduce the misjudgment rate of the fault of the to-be-tested submarine cable.

[0070] In an example, in the implementation of the high-voltage pulse current detection method, for high resistance faults, a flashover test can be used; for flashover faults, a direct flash test can be used. The wiring modes of the two test methods are the same.

[0071] Illustratively, the sampler can be a current sampler, and the coupler can be a linear current coupler.

[0072] In some embodiments, the photoelectric combined submarine cable fault detection device further comprises a shell 3, and the host body 1 and the high-voltage device 2 are placed in the shell 3. The bottom of the shell 3 is provided with a moving wheel 31, and the outer side wall of the shell 3 is provided with an extendable pull rod structure 32. The photoelectric combined submarine cable fault detection device can be moved to the required detection station through the moving wheel 31 and the pull rod structure 32, which is beneficial to improve the portability of the photoelectric combined submarine cable fault detection device.

[0073] In some embodiments, the shell 3 is further provided with an openable and closable door plate 33, and the host body 1 and the high-voltage device 2 are placed in or taken out of the shell 3 through the door plate 33, so as to realize the assembly of the photoelectric combined submarine cable fault detection device.

[0074] In an example, the pull rod structure 32 and the door plate 33 are arranged on the two opposite side walls of the shell 3, which is beneficial to avoid the opening of the door plate 33 when the photoelectric combined submarine cable fault detection device is moved through the pull rod structure 32.

[0075] In some embodiments, a movable partition 34 is arranged in the shell 3, which can be extended or retracted in the shell 3. The main body 1 is placed on the partition 34, and the high-voltage device 2 is placed below the partition 34. Due to the movability of the partition 34, during the operation of the main body 1, the partition 34 can be extended from the shell 3 to ensure the normal operation of the main body 1, so that the main body 1 is located outside the shell 3 to accelerate heat dissipation.

[0076] For example, in order to realize the movability of the partition 34, the partition 34 can be arranged on a guide rail, and the movement of the partition 34 on the guide rail can realize the movement of the partition 34; or other structures that can realize the movement of the partition 34.

[0077] In an example, the shell 3 is further provided with a wire passing hole 35, which can be used for the lines on the main body 1 and the high-voltage device 2 to pass in and out of the shell 3 through the wire passing hole 35.

[0078] In some embodiments, the main body 1 further includes a first housing 11, and the fault diagnosis module, the optical pulse module and the low-voltage pulse module are arranged inside the first housing 11, so that the first housing 11 plays a protective role for the fault diagnosis module, the optical pulse module and the low-voltage pulse module.

[0079] Further, the first housing 11 is provided with an optical pulse output interface 111 and a low-voltage pulse output interface 112. The optical pulse output interface 111 is electrically connected with the optical pulse module and the fault diagnosis module, the to-be-tested submarine cable is connected with the main body 1 through the optical pulse output interface 111, the optical pulse module sends optical pulses to the to-be-tested submarine cable through the optical pulse output interface 111, the optical pulses returned through the to-be-tested submarine cable return to the main body 1 through the optical pulse output interface 111 and are collected by the fault diagnosis module.

[0080] The low-voltage pulse output interface 112 is electrically connected with the low-voltage pulse module and the fault diagnosis module, the to-be-tested submarine cable is connected with the main body 1 through the low-voltage pulse output interface 112, the low-voltage pulse module sends low-voltage pulses to the to-be-tested submarine cable through the low-voltage pulse output interface 112, and the sent low-voltage pulses are collected by the fault diagnosis module; the low-voltage pulses returned through the to-be-tested submarine cable return to the main body 1 through the low-voltage pulse output interface 112 and are collected by the fault diagnosis module. Through the above structure, the transmission of optical pulses and low-voltage pulses between the main body 1 and the to-be-tested submarine cable is realized.

[0081] In an example, in order to realize the electrical connection between the optical pulse output interface 111 and the to-be-tested submarine cable, a first connecting line is adopted, one end of the first connecting line is connected with the optical pulse output interface 111, and the other end is connected with the optical cable of the to-be-tested submarine cable. In order to realize the electrical connection between the low-voltage pulse output interface 112 and the to-be-tested submarine cable, a second connecting line is adopted, one end of the second connecting line is connected with the low-voltage pulse output interface 112, and the other end is connected with the to-be-tested submarine cable.

[0082] For example, the first connecting line and the second connecting line are used to realize the connection between the main body 1 and the to-be-tested submarine cable, the first connecting line includes but is not limited to various optical fiber jumpers, and the second connecting line includes but is not limited to test leads.

[0083] In some embodiments, the main body 1 further comprises an operation display screen 12, which is electrically connected with the fault diagnosis module, the optical pulse module and the low-voltage pulse module. The operator can adjust the parameters of the optical pulse sent by the optical pulse module and the parameters of the low-voltage pulse sent by the low-voltage pulse module through the operation display screen 12, and the operation display screen 12 can also display the comprehensive fault information of the to-be-tested submarine cable finally determined by the fault diagnosis module, so as to facilitate the operator to check. It should be noted that the operation display screen 12 can also be used for other touch screen operations of the operator.

[0084] For example, the operation display screen 12 is arranged on the outer surface of the first shell 11 and located on the upper surface of the first shell 11, so as to facilitate the operator to perform equipment operation and check the diagnosis result on the operation display screen 12.

[0085] In some embodiments, the main body 1 further comprises a heat dissipation structure 13 arranged on the first shell 11, which can realize heat dissipation of the fault diagnosis module, the optical pulse module and the low-voltage pulse module, so as to ensure the normal operation of the main body.

[0086] For example, the heat dissipation structure 13 can be arranged as a heat dissipation fan or other structure with heat dissipation function.

[0087] In some embodiments, the first shell 11 further comprises a first key 113, a reset key 114, a first power supply interface 115 and a first grounding structure 116. The first power supply interface 115 is used to realize the power-on of the main body 1; the first key 113 is used to realize the opening and closing of the main body 1; in the case of abnormality or crash of the main body 1, the reset key 114 can be used to realize the restart of the main body 1; and the first grounding structure 116 plays a role of electric shock protection for the main body 1, which is conducive to ensuring the safety of the operator.

[0088] For example, the first grounding structure 116 can be arranged as a grounding column.

[0089] In an example, the host body 1 is further provided with a wifi interface 117, a USB interface 118 and indicator lights 119. The wifi interface 117 can be used to realize the network connection of the host body 1, the USB interface 118 can be used to realize the data export of the host body 1, and the indicator lights 119 include power indicator lights, event indicator lights, fault indicator lights and running indicator lights.

[0090] The power indicator lights are on to indicate that the host body 1 is connected to the power supply. The event indicator lights are briefly on when the operator performs any operation on the host body 1, indicating that the current operation has been triggered. After the operation is completed, the event indicator lights are briefly on again, indicating that the current operation process is completed. When the host body 1 is running normally, the running indicator lights are on. When the host body 1 fails, the running indicator lights are off, and the fault indicator lights are on to prompt the operator.

[0091] In some embodiments, the high-voltage device 2 further comprises a second shell 21, and the high-voltage pulse module is located inside the second shell 21, so that the second shell 21 plays a role in protecting the high-voltage pulse module. The second shell 21 is provided with a high-voltage pulse output interface 211, which is electrically connected with the high-voltage pulse module. The to-be-tested submarine cable is connected with the high-voltage device 2 through the high-voltage pulse output interface 211, so that the high-voltage pulse module sends high-voltage pulses to the to-be-tested submarine cable through the high-voltage pulse output interface 211.

[0092] In an example, in order to realize the electrical connection between the high-voltage pulse output interface 211 and the to-be-tested submarine cable, a third connecting line can be used, one end of which is connected with the high-voltage pulse output interface 211, and the other end of which is connected with the to-be-tested submarine cable. In the case of having the third connecting line, in order to collect the current signal to and from the to-be-tested submarine cable, the sampling end of the sampler is placed in parallel with the third connecting line. It should be noted that the to-be-tested submarine cable is directly grounded, and the current flowing from the high-voltage device 2 to the to-be-tested submarine cable returns to the high-voltage device 2 directly through the grounding line, so that the sampler can collect the current signal returned through the to-be-tested submarine cable.

[0093] In an example, the sampler is electrically connected with the fault diagnosis module by being connected to the low-voltage pulse output interface 112 of the host body 1. It should be noted that before the sampler is connected with the low-voltage pulse output interface 112, the second connecting line connecting the low-voltage pulse output interface 112 with the to-be-tested submarine cable has been disassembled.

[0094] For example, the third connecting line is used to realize the electrical connection between the high-voltage device 2 and the to-be-tested submarine cable, including but not limited to being provided as a test lead and the like.

[0095] In an example, in order to realize the electrical connection of the coupler with the main body 1, the high-voltage device 2 and the to-be-tested submarine cable, the first end of the coupler is connected with the low-voltage pulse output interface of the main body 1, the second end of the coupler is connected with the high-voltage pulse output interface of the high-voltage device 2, and the third end of the coupler is connected with the to-be-tested submarine cable. In order to protect the safety of the operator, the fourth end of the coupler is grounded. It should be noted that when the electrical connection of the coupler with the main body 1, the high-voltage device 2 and the to-be-tested submarine cable is performed, no other electrical connection line is connected to the low-voltage pulse output interface and the high-voltage pulse output interface.

[0096] In some embodiments, the high-voltage device 2 further comprises a voltage adjusting knob 22, an ammeter 212 and a voltmeter 213 arranged on the second shell 21. The voltage value output by the high-voltage pulse module can be adjusted through the voltage adjusting knob 22, and the voltage value is displayed through the voltmeter 213, so that the operator can accurately read and output the required voltage value, thereby realizing the breakdown of the fault point of the to-be-tested submarine cable. For example, during the voltage adjusting process, the required voltage can be tested and the voltage adjusting operation can be performed step by step. The ammeter 212 is used to detect the current value applied to the loop of the to-be-tested submarine cable, and by the change of the current, it is judged whether the high-voltage device 2 or the current loop is abnormal.

[0097] And by observing the values of the ammeter 212 and the voltmeter 213, it can be determined whether the fault point of the to-be-tested submarine cable is broken down. When the fault point of the to-be-tested submarine cable is broken down and fully discharged, the value of the voltmeter 213 is instantaneously zero, and the value of the ammeter 212 is instantaneously large. During the discharging process, when the values of the ammeter 212 and the voltmeter 213 are both 0, it indicates that the discharging of the high-voltage device 2 is completed. If the discharging time is much longer than the conventional discharging time, but the value of the ammeter 212 is still not 0, then at this time it is considered that the high-voltage device 2 has an abnormality.

[0098] In some embodiments, the second shell 21 further comprises a second key 23, a pause key 24, an emergency stop key 25, a discharging key 26, a discharging timer 27, a second grounding structure 28 and a second power supply interface 29. The high-voltage device 2 is powered on through the second power supply interface 29, the high-voltage device 2 is started and stopped through the second key 23, and the high-voltage device 2 is protected from electric shock through the second grounding structure 28, which is conducive to ensuring the safety of the operator.

[0099] After the high-voltage device 2 is started, the pause key 24 needs to be pressed to ensure that the high-voltage device 2 will not immediately or accidentally generate high voltage after being powered on, so as to achieve the purpose of cutting off the high-voltage pulse module and avoiding the output of high-voltage pulse by the high-voltage pulse module, and the high-voltage pulse module is placed in a safe standby state.

[0100] Subsequently, the discharge time is set by the discharge timer 27. Exemplarily, the discharge time can be set to any suitable time, such as 6 seconds, etc. After the discharge time is set to 6 seconds, it means that the high-voltage pulse module sends a high-voltage pulse to the to-be-tested submarine cable for 6 seconds and then automatically discharges. The operator observes whether the fault point of the to-be-tested submarine cable is broken down, and adjusts in a timely manner whether the voltage needs to be further increased for the next injection.

[0101] After the connection of the high-voltage device 2 is completed, the discharge time is set, and there is no any abnormality, the pause key 24 can be pressed again, so that the high-voltage device 2 can output the high-voltage pulse of the corresponding voltage level set in advance.

[0102] When an abnormality or a dangerous situation occurs during the operation of the high-voltage device 2, the emergency stop key 25 is pressed to directly cut off the power input of the high-voltage pulse module and trigger the discharge protection circuit to quickly release the high-voltage electrical energy stored in the capacitor.

[0103] After the fault test of the to-be-tested submarine cable is completed, in order to avoid the residual high voltage of the high-voltage device 2, the discharge key 26 is pressed to actively discharge, so as to prevent the operator from being electrically shocked by mistake.

[0104] Exemplarily, the second grounding structure 28 can be set as a grounding column.

[0105] An embodiment of the present application also provides an optoelectronic combined submarine cable fault detection method. The method is suitable for the optoelectronic combined submarine cable fault detection device described above. The submarine cable fault detection method can include steps S110 to S200, which are described in detail as follows.

[0106] In step S110, the to-be-tested submarine cable is connected to the main body 1.

[0107] In some embodiments, before the fault point position of the to-be-tested submarine cable is detected, the electrical connection between the to-be-tested submarine cable and the main body 1 needs to be completed. One end of the first connecting line is connected to the optical pulse output interface 111 of the main body 1, and the other end is connected to the optical cable of the to-be-tested submarine cable. One end of the second connecting line is connected to the low-voltage pulse output interface 112 of the main body 1, and the other end is connected to the to-be-tested submarine cable, so as to realize the electrical connection between the to-be-tested submarine cable and the main body 1.

[0108] In step S120, the optical pulse module is controlled to send continuous optical pulses to the to-be-tested submarine cable, and the low-voltage pulse module is controlled to send low-voltage pulses to the to-be-tested submarine cable.

[0109] In some embodiments, the operator can select the transmission speed of the light pulse and the low-voltage pulse in the to-be-tested submarine cable to be detected through the operation of the display screen 12, and adjust the parameters of the emitted light pulse and the low-voltage pulse. After the to-be-set is completed, the operator clicks on the "sample" on the operation display screen 12, so that the light pulse module of the main body 1 sends a continuous light pulse to the to-be-tested submarine cable, and the low-voltage pulse module of the main body 1 sends a low-voltage pulse to the to-be-tested submarine cable.

[0110] Step S130, control the fault diagnosis module to collect the light pulse returned through the to-be-tested submarine cable, and determine the mechanical fault information of the to-be-tested submarine cable according to the light pulse; control the fault diagnosis module to collect the low-voltage pulse to and from the to-be-tested submarine cable, and determine the electrical fault information of the to-be-tested submarine cable according to the low-voltage pulse.

[0111] In some embodiments, when the light pulse propagates in the optical cable, it encounters a scattering point to form back Rayleigh scattering light, which is collected by the fault diagnosis module as the light pulse returned by the optical cable. The fault diagnosis module calculates the phase difference between the two ends of the vibration section of the optical cable according to the light pulse returned by the to-be-tested submarine cable, realizes the quantitative measurement of the optical cable tension or strain, and further obtains the intensity of the vibration signal. At the same time, the time domain and frequency domain information of the vibration signal can be obtained, realizing more accurate recognition and positioning of the vibration signal.

[0112] Because the mechanical fault of the to-be-tested submarine cable often has an impact on the strain and vibration of the optical cable of the to-be-tested submarine cable, and even causes the breakage of the optical cable, therefore, by detecting the distributed strain and vibration of the optical cable, the breakpoint and the position of the decay deterioration of the optical cable can be detected, and the running state of the to-be-tested submarine cable can be detected, and the mechanical fault information of the to-be-tested submarine cable can be obtained.

[0113] When the low-voltage pulse module sends a low-voltage pulse to the to-be-tested submarine cable, the fault diagnosis module collects the sent low-voltage pulse. The low-voltage pulse propagates along the length direction of the to-be-tested submarine cable, and when it encounters an impedance mismatch point such as a low resistance, an open circuit fault, etc., it produces reflection, and the reflected low-voltage pulse returns to the main body 1 along the length direction of the to-be-tested submarine cable and is collected by the fault diagnosis module.

[0114] The fault diagnosis module calculates the distance of the fault point of the to-be-tested submarine cable according to the interval time of the low-voltage pulse to and from the to-be-tested submarine cable twice, and the transmission speed of the low-voltage pulse in the to-be-tested submarine cable is known, so as to obtain the electrical fault information of the to-be-tested submarine cable.

[0115] Step S140, connecting the to-be-tested submarine cable to the high-voltage device 2, and connecting the sampler to the main body 1.

[0116] In some embodiments, when the fault point of the submarine cable to be tested is in a high resistance state, the low-voltage pulse module is used to send a low-voltage pulse to the submarine cable to be tested, that is, the low-voltage pulse detection method cannot detect the fault point of the submarine cable to be tested, and therefore another method needs to be used to detect the fault point of the submarine cable to be tested, such as the high-voltage pulse current detection method, which needs to be applied to the high-voltage device 2 and the sampler.

[0117] Before the detection of the submarine cable to be tested is implemented by using the high-voltage device 2 and the sampler, the electrical connection between the submarine cable to be tested and the high-voltage device 2 needs to be completed. One end of the third connecting line is connected to the high-voltage pulse output interface 211 of the high-voltage device 2, and the other end is connected to the submarine cable to be tested. The electrical connection between the sampler and the main body 1 also needs to be completed, and the sampler is connected to the low-voltage pulse output interface 112 of the main body 1, so that the signal of the sampler can be fed back to the fault diagnosis module. In the case of the third connecting line, in order to collect the current signal to and from the submarine cable to be tested, the sampling end of the sampler is placed in parallel with the third connecting line.

[0118] It should be noted that when the connection between the high-voltage device 2 and the submarine cable to be tested is made, it can be made when the high-voltage device 2 is not powered on or not started, or it can be made after the high-voltage device 2 is started. When the connection between the two is made after the high-voltage device 2 is started, the pause key 24 of the high-voltage device 2 needs to be pressed to ensure that the high-voltage device 2 does not output high voltage and to ensure the safety of the operator.

[0119] Step S150, control the high-voltage pulse module to send a high-voltage pulse to the submarine cable to be tested, and after the arc discharge breakdown at the fault point of the submarine cable to be tested, control the sampler to collect the current signal to and from the submarine cable to be tested and send the current signal to the fault diagnosis module.

[0120] In some embodiments, after the high-voltage device 2, the sampler, and the submarine cable to be tested are connected, the operator sets the discharge time through the discharge timer 27 and adjusts the high-voltage value through the voltage adjustment knob 22, then presses the pause key 24 and controls the high-voltage pulse module of the high-voltage device 2 to send a high-voltage pulse of a corresponding voltage level to the submarine cable to be tested.

[0121] The high-voltage pulse propagates along the length direction of the submarine cable to be tested to break through the fault point of the submarine cable to be tested by the high-voltage pulse, so that the fault point changes from a high resistance state to a low resistance or short circuit state, and a large current is generated in the loop due to the breakdown. At this time, the sampler collects the current signal to and from the high-voltage generator and the fault point and sends the current signal to the fault diagnosis module of the main body 1.

[0122] If the fault point cannot be broken through, the voltage level of the high-voltage pulse is gradually increased, and the above operation is repeated.

[0123] Step S160, control the fault diagnosis module to determine the electrical fault information according to the current signal.

[0124] In some embodiments, according to the time taken for the current to propagate from the pulse port to the fault point and back once, and given the known speed of the current signal in the cable under test, the distance of the fault point of the cable under test can be calculated, thereby obtaining the electrical fault information of the cable under test.

[0125] Step S170, the coupler is connected to the main body 1, the high-voltage device 2 and the cable under test at the same time.

[0126] In some embodiments, when the fault point of the cable under test is in a high-resistance state, the fault point of the cable under test can also be detected by the electric arc reflection detection method, which needs to be applied to the main body 1, the high-voltage device 2 and the coupler. The first end of the coupler is connected to the low-voltage pulse output interface 112 of the main body 1, the second end of the coupler is connected to the high-voltage pulse output interface 211 of the high-voltage device 2, and the third end of the coupler is connected to the cable under test, so as to realize the electrical connection of the main body 1, the high-voltage device 2 and the cable under test through the coupler. And the fourth end of the coupler is grounded to ensure the safety of the operator.

[0127] It should be noted that when connecting the high-voltage device 2 and the coupler, it can be done when the high-voltage device 2 is not powered on or not started, or it can be done after the high-voltage device 2 is started. When connecting the two after the high-voltage device 2 is started, the pause key 24 of the high-voltage device 2 needs to be pressed to ensure that the high-voltage device 2 does not output high voltage, thereby ensuring the safety of the operator.

[0128] Step S180, the high-voltage pulse module is controlled to send a high-voltage pulse to the cable under test. After the arc discharge breakdown at the fault point of the cable under test, the low-voltage pulse module is controlled to send a low-voltage pulse to the cable under test, and the fault diagnosis module is controlled to collect the low-voltage pulse returned through the cable under test. After the arc of the cable under test is extinguished, the low-voltage pulse module is controlled to send a low-voltage pulse to the cable under test again, and the fault diagnosis module is controlled to collect the low-voltage pulse returned through the cable under test.

[0129] In some embodiments, after the main body 1, the high-voltage device 2, the coupler and the cable under test are connected, the operator sets the discharge time through the discharge timer 27 and adjusts the high-voltage value through the voltage adjusting knob 22, and then presses the pause key 24 and controls the high-voltage pulse module of the high-voltage device 2 to send a high-voltage pulse to the cable under test through the coupler.

[0130] The high-voltage pulse propagates along the length direction of the to-be-tested submarine cable to cause the fault point of the to-be-tested submarine cable to generate arc discharge and change from a high-resistance state to a low-resistance or short-circuit state by high-voltage pulse breakdown. Subsequently, the low-voltage pulse module of the main body 1 sends a low-voltage pulse to the to-be-tested submarine cable through the coupler, the low-voltage pulse propagates along the length direction of the to-be-tested submarine cable, and when the low-voltage pulse reaches the fault point in the low-resistance or short-circuit state, the low-voltage pulse is reflected. The reflected low-voltage pulse is transmitted back to the main body 1 through the coupler along the length direction of the to-be-tested submarine cable and is collected by the fault diagnosis module.

[0131] After the arc of the to-be-tested submarine cable is extinguished and the high-resistance state is restored, the low-voltage pulse module again sends a low-voltage pulse to the to-be-tested submarine cable through the coupler, the low-voltage pulse travels to the end of the to-be-tested submarine cable away from the low-voltage pulse module and returns, and the low-voltage pulse returned through the to-be-tested submarine cable is again transmitted back to the main body 1 through the coupler and is collected by the fault diagnosis module.

[0132] Step S190, control the fault diagnosis module to determine the electrical fault information according to the low-voltage pulses returned twice by the to-be-tested submarine cable.

[0133] In some embodiments, the fault diagnosis module compares the low-voltage pulses returned through the to-be-tested submarine cable collected twice to determine the position of the fault point of the to-be-tested submarine cable, so as to obtain the interval time between the position of the fault point and the low-voltage pulse sending end, and further calculate the distance of the fault point of the to-be-tested submarine cable, thereby obtaining the electrical fault information of the to-be-tested submarine cable.

[0134] It should be noted that in the process of detecting the electrical fault information of the to-be-tested submarine cable, the low-voltage pulse detection method can be used first, and then the high-voltage pulse current detection method or the electric arc reflection detection method can be used.

[0135] In some embodiments, after the fault detection of the to-be-tested submarine cable is completed, the "stop sampling" on the operation display screen 12 of the main body 1 needs to be clicked, the output voltage is returned to zero by rotating the pressure regulating knob 22, the discharge key 26 of the high-voltage device 2 is pressed until the voltmeter 213 and the ammeter 212 are both returned to zero, and then the discharge rod is used to discharge the to-be-tested submarine cable to avoid residual voltage of the high-voltage device 2 and the to-be-tested submarine cable, so as to ensure the safety of the operator.

[0136] Step S200, control the fault diagnosis module to determine the comprehensive fault information of the to-be-tested submarine cable according to the determined mechanical fault information and electrical fault information.

[0137] In some embodiments, after the to-be-fault-diagnosed module determines the mechanical fault information and the electrical fault information of the to-be-tested submarine cable according to steps S110 to S190, the to-be-fault-diagnosed module controls the fault diagnosis module to further determine comprehensive fault information of the to-be-tested submarine cable according to the determined mechanical fault information and the electrical fault information of the to-be-tested submarine cable, so as to comprehensively judge the fault of the to-be-tested submarine cable, rather than being limited to the mechanical fault information or the electrical fault information.

[0138] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A photoelectric combined submarine cable fault detection device, characterized in that: include: A main body, comprising a fault diagnosis module, and an optical pulse module and a low-voltage pulse module electrically connected to the fault diagnosis module, wherein the optical pulse module is used to send optical pulses to the submarine cable to be tested, and the low-voltage pulse module is used to send low-voltage pulses to the submarine cable to be tested; A high-voltage device, comprising a high-voltage pulse module, wherein the high-voltage pulse module is used to send a high-voltage pulse to the submarine cable to be tested; a sampler, configured to be electrically connected to the fault diagnosis module and to collect a current signal traveling back and forth on the submarine cable to be tested, so as to send the current signal to the fault diagnosis module; a coupler, configured to be electrically connected to the fault diagnosis module, the low-voltage pulse module, the high-voltage pulse module, and the submarine cable to be tested; the low-voltage pulse module sends a low-voltage pulse to the submarine cable to be tested via the coupler; the fault diagnosis module is configured to collect the low-voltage pulse returned by the submarine cable to be tested via the coupler; and the high-voltage pulse module sends a high-voltage pulse to the submarine cable to be tested via the coupler; The fault diagnosis module collects optical pulses returned by the submarine cable under test, and low-voltage pulses and current signals traveling to and from the submarine cable under test, so as to determine comprehensive fault information of the submarine cable under test.

2. The optoelectronic combined submarine cable fault detection device according to claim 1, characterized in that: The main body also includes a first shell, and the fault diagnosis module, the optical pulse module and the low-voltage pulse module are all arranged inside the first shell, and the first shell is provided with an optical pulse output interface electrically connected to the optical pulse module and the fault diagnosis module, and a low-voltage pulse output interface electrically connected to the low-voltage pulse module and the fault diagnosis module.

3. The optoelectronic combined submarine cable fault detection device according to claim 2, characterized in that: The optical pulse output interface is connected to the submarine cable to be tested via a first connecting line, and the low-voltage pulse output interface is connected to the submarine cable to be tested via a second connecting line.

4. The optoelectronic combined submarine cable fault detection device according to claim 2, characterized in that: The sampler is used to be connected to the low-voltage pulse output interface to electrically connect the sampler to the fault diagnosis module.

5. The optoelectronic combined submarine cable fault detection device according to claim 2, characterized in that: The main body also includes an operation display screen electrically connected to the fault diagnosis module, the optical pulse module and the low-voltage pulse module, and the operation display screen is used to adjust the parameters of the optical pulse sent by the optical pulse module, adjust the parameters of the low-voltage pulse sent by the low-voltage pulse module, and display the comprehensive fault information.

6. The optoelectronic combined submarine cable fault detection device according to claim 5, characterized in that: The operation display screen is arranged on the first housing and is located on the upper surface of the first housing.

7. The optoelectronic combined submarine cable fault detection device according to claim 2, characterized in that: The main body further includes a heat dissipation structure, and the heat dissipation structure is arranged on the first shell.

8. The optoelectronic combined submarine cable fault detection device according to claim 7, characterized in that: The first housing is also provided with a first power key, a reset key, a first power interface and a first grounding structure.

9. The optoelectronic combined submarine cable fault detection device according to claim 2, characterized in that: The high-voltage device further includes a second shell, the high-voltage pulse module is located inside the second shell, and the second shell is provided with a high-voltage pulse output interface electrically connected to the high-voltage pulse module.

10. The optoelectronic combined submarine cable fault detection device according to claim 9, characterized in that: The high-voltage pulse output interface is connected to the submarine cable to be tested via a third connecting line, and the sampling end of the sampler is arranged in parallel with the third connecting line.

11. The optoelectronic combined submarine cable fault detection device according to claim 9, characterized in that: The first end of the coupler is connected to the low-voltage pulse output interface, the second end of the coupler is connected to the high-voltage pulse output interface, the third end of the coupler is connected to the submarine cable to be tested, and the fourth end of the coupler is grounded.

12. The optoelectronic combined submarine cable fault detection device according to claim 9, characterized in that: The high-voltage device also includes a voltage regulating knob, an ammeter and a voltmeter arranged on the second shell, the voltage regulating knob is used to adjust the voltage value output by the high-voltage pulse module, the voltmeter is used to display the voltage value output by the high-voltage pulse module, and the ammeter is used to detect the current value applied to the submarine cable loop to be tested.

13. The optoelectronic combined submarine cable fault detection device according to claim 12, characterized in that: The second housing is also provided with a second on / off key, a pause key, an emergency stop key, a discharge key, a discharge timer, a second grounding structure and a second power supply interface.

14. The optoelectronic combined submarine cable fault detection device according to any one of claims 1 to 13, characterized in that: The optoelectronic combined submarine cable fault detection device further comprises a shell, wherein the main body and the high-voltage device are both located in the shell, and a moving wheel is provided at the bottom of the shell, and a pull rod structure is provided on the outer side wall of the shell.

15. The optoelectronic combined submarine cable fault detection device according to claim 14, characterized in that: The shell is provided with a door plate, and the main body and the high-voltage device are placed into the shell or taken out from the shell through the door plate.

16. The optoelectronic combined submarine cable fault detection device according to claim 15, characterized in that: A partition is provided in the shell, and the partition can be extended or retracted into the shell. The main body is placed on the partition, and the high-voltage device is placed below the partition.

17. A photoelectric combined submarine cable fault detection method, characterized in that: The optical-electrical combined submarine cable fault detection device according to any one of claims 1 to 16 is used to detect a submarine cable to be tested, the method comprising: Connect the submarine cable to be tested to the main body; Controlling the optical pulse module to send continuous optical pulses to the submarine cable to be tested, and the low-voltage pulse module to send low-voltage pulses to the submarine cable to be tested; The control fault diagnosis module collects optical pulses returned by the submarine cable to be tested, and determines mechanical fault information of the submarine cable to be tested based on the optical pulses; the control fault diagnosis module collects low-voltage pulses traveling to and from the submarine cable to be tested, and determines electrical fault information of the submarine cable to be tested based on the low-voltage pulses; Connecting the submarine cable to be tested to a high-voltage device, and connecting a sampler to the main body; Controlling the high-voltage pulse module to send a high-voltage pulse to the submarine cable to be tested, and after an arc discharge breakdown occurs at a fault point of the submarine cable to be tested, controlling the sampler to collect a current signal traveling to and from the submarine cable to be tested, and sending the current signal to the fault diagnosis module; controlling the fault diagnosis module to determine the electrical fault information according to the current signal; Connecting the coupler to the main body, the high-voltage device and the submarine cable to be tested simultaneously; Controlling the high-voltage pulse module to send a high-voltage pulse to the submarine cable to be tested; after an arc discharge breakdown occurs at a fault point of the submarine cable to be tested, controlling the low-voltage pulse module to send a low-voltage pulse to the submarine cable to be tested, and controlling the fault diagnosis module to collect the low-voltage pulse returned by the submarine cable to be tested; after the arc in the submarine cable to be tested is extinguished, controlling the low-voltage pulse module to send a low-voltage pulse to the submarine cable to be tested again, and controlling the fault diagnosis module to collect the low-voltage pulse returned by the submarine cable to be tested; Controlling the fault diagnosis module to determine the electrical fault information according to the low-voltage pulses returned twice by the submarine cable to be tested; The fault diagnosis module is controlled to determine comprehensive fault information of the submarine cable to be tested according to the determined mechanical fault information and the electrical fault information.

18. The optoelectronic combined submarine cable fault detection method according to claim 17, characterized in that: Connect the submarine cable to be tested to the main body, including: The optical pulse output interface of the main body is connected to the submarine cable to be tested via a first connecting line, and the low-voltage pulse output interface of the main body is connected to the submarine cable to be tested via a second connecting line.

19. The optoelectronic combined submarine cable fault detection method according to claim 17, characterized in that: Connecting the submarine cable to be tested to a high-voltage device and connecting a sampler to the main body, including: Connecting the high-voltage pulse output interface of the high-voltage device to the submarine cable to be tested via a third connecting line; The sampler is connected to the low-voltage pulse output interface of the main body, and the sampling end of the sampler is placed parallel to the third connecting line.

20. The optoelectronic combined submarine cable fault detection method according to claim 17, characterized in that: Connecting the coupler to the main body, the high-voltage device and the submarine cable to be tested simultaneously includes: The first end of the coupler is connected to the low-voltage pulse output interface of the main body, the second end of the coupler is connected to the high-voltage pulse output interface of the high-voltage device, and the third end of the coupler is connected to the submarine cable to be tested.

21. The optoelectronic combined submarine cable fault detection method according to claim 17, characterized in that: The method further includes performing a discharge operation on a pressurized circuit of the high-voltage device after completing fault detection of the submarine cable to be tested by the high-voltage device.

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