Optical-electric combined submarine cable fault detection device and detection method

Abstract

The application provides an optical and electrical combined submarine cable fault detection device and method, and belongs to the technical field of submarine cable fault detection. The optical and electrical combined submarine cable fault detection device comprises a main body, a high-voltage device, a sampler and a coupler. The main body comprises a fault diagnosis module, an optical pulse module and a low-voltage pulse module electrically connected with the fault diagnosis module. The high-voltage device comprises a high-voltage pulse module. The sampler is electrically connected with the fault diagnosis module and is used for collecting the current signals that are transmitted back and forth on the submarine cable to be detected. 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 fault diagnosis module is used for collecting the optical pulses returned through the submarine cable to be detected, the low-voltage pulses and the current signals transmitted back and forth on the submarine cable to be detected, so as to determine the comprehensive fault information of the submarine cable to be detected. The application combines the mechanical fault information and the electrical fault information of the submarine cable to be detected to determine the comprehensive fault information of the submarine cable to be detected, which is beneficial to reducing the misjudgment rate of the fault of the submarine cable to be detected.

Description

Technical Field

[0001] This invention relates to the field of submarine cable fault detection technology, and in particular to a photoelectric combined submarine cable fault detection device and detection method. Background Technology

[0002] In power systems, submarine cables serve as crucial transmission channels for offshore wind power development and island power supply. The development of the offshore wind power industry requires a large number of submarine cables to transmit electricity to ensure power supply along the coast; moreover, island power supply also relies on submarine cables, making their importance increasingly significant.

[0003] Submarine cables exist in a complex marine environment, susceptible to natural factors such as seawater corrosion, ocean currents, and geological changes, as well as threats from human activities such as ship anchoring, fishing, and marine engineering construction, making them prone to failure. A submarine cable failure can disrupt power supply, causing substantial economic losses to power companies and severely impacting coastal industrial production and residents' lives. Therefore, conducting research on submarine cable fault monitoring is of great significance for ensuring the safe and stable operation of the power system and improving power supply reliability. Related technologies for submarine cable fault monitoring employ offline positioning devices or online monitoring systems.

[0004] Offline positioning devices mainly fall into two categories. One category employs single technologies such as acoustic measurement, magnetic vector method, and low-voltage pulse method; the other category uses broadband impedance spectrum or low-voltage pulse fault location methods. While these methods offer relatively high measurement accuracy, range, and reliability, they still suffer from positioning errors on the order of hundreds of meters in practical applications, and their human-machine interface is poor. Both of these detection methods rely on the analysis of single characteristic quantities, resulting in drawbacks such as large fault diagnosis errors.

[0005] Online monitoring systems, as fixed monitoring equipment, employ distributed fiber optic sensing technology. Their approach focuses on the acquisition and analysis of light intensity or amplitude, generally exhibiting high sensitivity to changes in the mechanical characteristics of submarine cables, such as vibration and temperature. However, fiber optic sensors must be installed synchronously with the submarine cable, and they only offer fault diagnosis methods based on fiber optic technology, failing to detect power outages offline. Furthermore, online monitoring systems detect submarine cable routes by synchronously locating the cable using the latitude and longitude of the construction vessel during cable laying, without considering changes caused by ocean currents, ship hooking, and towing.

[0006] Therefore, a new solution is needed to address the aforementioned technical problems. Summary of the Invention

[0007] This invention provides a photoelectric combined submarine cable fault detection device and detection method to solve the technical problem of poor accuracy in locating submarine cable fault points caused by the use of a single detection technology in related technologies.

[0008] This invention provides a photoelectric combined submarine cable fault detection device, comprising a main body, a high-voltage device, a sampler, and a coupler. The main body includes a fault diagnosis module, and an optical pulse module and a low-voltage pulse module electrically connected to the fault diagnosis module. The optical pulse module sends optical pulses to the submarine cable under test, and the low-voltage pulse module sends low-voltage pulses to the submarine cable under test. The high-voltage device includes a high-voltage pulse module, which sends high-voltage pulses to the submarine cable under test. The sampler is electrically connected to the fault diagnosis module and collects the round-trip current signal on the submarine cable under test to detect the current. The signal is sent to the fault diagnosis module; the coupler is used to electrically connect to the fault diagnosis module, the low-voltage pulse module, the high-voltage pulse module, and the submarine cable under test. The low-voltage pulse module sends low-voltage pulses to the submarine cable under test via the coupler. The fault diagnosis module is used to collect the low-voltage pulses returned by the submarine cable under test via the coupler. The high-voltage pulse module sends high-voltage pulses to the submarine cable under test via the coupler. The fault diagnosis module collects the optical pulses returned by the submarine cable under test, as well as the low-voltage pulses and current signals traveling to and from the submarine cable under test, to determine the comprehensive fault information of the submarine cable under test.

[0009] In one embodiment of the present invention, the fault diagnosis module is used to collect optical pulses returned by the submarine cable under test, as well as low-voltage pulses and current signals traveling to and from the submarine cable under test, in order to determine the mechanical fault information and electrical fault information of the submarine cable under test.

[0010] In one embodiment of the present invention, the optical pulse output interface is connected to the submarine cable under test via a first connecting line, and the low-voltage pulse output interface is connected to the submarine cable under test via a second connecting line.

[0011] In one embodiment of the present invention, the sampler is used to connect to the low-voltage pulse output interface to electrically connect the sampler to the fault diagnosis module.

[0012] In one embodiment of the present invention, the main body further includes an operation display screen electrically connected to the fault diagnosis module, the optical pulse module and the low-voltage pulse module. 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.

[0013] In one embodiment of the present invention, the operation display screen is disposed on the first housing and located on the upper surface of the first housing.

[0014] In one embodiment of the present invention, the main body further includes a heat dissipation structure, which is disposed on the first outer shell.

[0015] In one embodiment of the present invention, the first housing is further provided with a first power switch, a reset button, a first power interface and a first grounding structure.

[0016] In one embodiment of the present invention, the high-voltage device further includes a second housing, the high-voltage pulse module is located inside the second housing, and the second housing is provided with a high-voltage pulse output interface electrically connected to the high-voltage pulse module.

[0017] In one embodiment of the present invention, the high-voltage pulse output interface is connected to the submarine cable under test via a third connecting line, and the sampling end of the sampler is arranged parallel to the third connecting line.

[0018] In one embodiment of the present invention, 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 under test, and the fourth end of the coupler is grounded.

[0019] In one embodiment of the present invention, the high-voltage device further includes a voltage regulating knob, an ammeter, and a voltmeter disposed on the second housing. 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 circuit under test.

[0020] In one embodiment of the present invention, the second housing is further provided with a second power switch, a pause button, an emergency stop button, a discharge button, a discharge timer, a second grounding structure, and a second power interface.

[0021] In one embodiment of the present invention, the optoelectronic combined submarine cable fault detection device further includes a housing, the main body and the high voltage device are both located inside the housing, and the bottom of the housing is provided with a moving wheel, and the outer side wall of the housing is provided with a pull rod structure.

[0022] In one embodiment of the present invention, a door panel is provided on the housing, and the main body and the high-voltage device are placed into the housing or taken out from the housing through the door panel.

[0023] In one embodiment of the present invention, a partition is provided inside the housing, the partition can extend or retract into the housing, and the main body is placed on the partition, and the high-voltage device is placed below the partition.

[0024] This invention also provides a photoelectric combined submarine cable fault detection method, which uses the photoelectric combined submarine cable fault detection equipment described in any one of the above claims to detect the submarine cable under test, the method comprising:

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

[0026] The control optical pulse module sends continuous optical pulses to the submarine cable under test, and the low-voltage pulse module sends low-voltage pulses to the submarine cable under test;

[0027] The control fault diagnosis module collects optical pulses returned by the submarine cable under test and determines the mechanical fault information of the submarine cable under test based on the optical pulses; the control fault diagnosis module collects low-voltage pulses traveling to and from the submarine cable under test and determines the electrical fault information of the submarine cable under test based on the low-voltage pulses.

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

[0029] The high-voltage pulse module sends a high-voltage pulse to the submarine cable under test. After an arc discharge breakdown occurs at the fault point of the submarine cable under test, the sampler is controlled to collect the current signal traveling back and forth to the submarine cable under test and send the current signal to the fault diagnosis module.

[0030] The fault diagnosis module is controlled to determine the electrical fault information based on the current signal;

[0031] The coupler is simultaneously connected to the main body, the high-voltage device, and the submarine cable under test.

[0032] The high-voltage pulse module sends a high-voltage pulse to the submarine cable under test. After an arc discharge breakdown occurs at the fault point of the submarine cable under test, the low-voltage pulse module sends a low-voltage pulse to the submarine cable under test, and the fault diagnosis module collects the low-voltage pulse returned by the submarine cable under test. After the arc of the submarine cable under test is extinguished, the low-voltage pulse module sends a low-voltage pulse to the submarine cable under test again, and the fault diagnosis module collects the low-voltage pulse returned by the submarine cable under test.

[0033] The fault diagnosis module determines the electrical fault information based on the two low-voltage pulses returned by the submarine cable under test.

[0034] The fault diagnosis module determines the comprehensive fault information of the submarine cable under test based on the determined mechanical fault information and electrical fault information.

[0035] In one embodiment of the present invention, connecting the submarine cable to be tested to the main body includes:

[0036] The optical pulse output interface of the main unit is connected to the submarine cable under test via a first connecting line, and the low-voltage pulse output interface of the main unit is connected to the submarine cable under test via a second connecting line.

[0037] In one embodiment of the present invention, the submarine cable to be tested is connected to a 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 under test via a third connecting line.

[0039] Connect the sampler to the low-voltage pulse output interface of the main body, and place the sampling end of the sampler parallel to the third connecting line.

[0040] In one embodiment of the present invention, connecting the coupler simultaneously to the main body, the high-voltage device, and the submarine cable under test includes:

[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 under test.

[0042] In one embodiment of the present invention, the method further includes discharging the circuit pressurized by the high-voltage device after the fault detection of the submarine cable under test is completed by the high-voltage device.

[0043] The beneficial effects of this invention: This invention proposes a photoelectric combined submarine cable fault detection device and method, comprising: 1) Sending continuous light pulses to the submarine cable under test via the main body's light pulse module. During propagation, the light pulses encounter scattering points, forming backscattered Rayleigh light. This backscattered Rayleigh light serves as the returning light pulse, returning to the fault diagnosis module via the cable. The fault diagnosis module determines the mechanical fault information of the submarine cable under test based on the returned light pulses; 2) Sending low-voltage pulses to the submarine cable under test via the main body's low-voltage pulse module. These low-voltage pulses encounter impedance mismatch points such as low resistance or open circuit faults in the submarine cable under test, resulting in reflection. The reflected low-voltage pulses return to the fault diagnosis module, which determines the electrical fault information of the submarine cable under test based on the low-voltage pulses traveling back and forth; 3) Sending high-voltage pulses to the submarine cable under test via the high-voltage device's high-voltage pulse module to break down the fault points. When the fault points are broken down, an arc discharge occurs, changing the state from high resistance to low resistance or short circuit. A sampler collects the current traveling back and forth across the submarine cable under test. The signal is sent to the fault diagnosis module so that the fault diagnosis module can determine the electrical fault information of the submarine cable under test based on the current signal; 4) The main body, high voltage device and submarine cable under test are connected by a coupler. The high voltage pulse module sends a high voltage pulse to break down the fault point of the submarine cable under test, so that it changes from a high resistance state to a low resistance or short circuit state. Then, the low voltage pulse module sends a low voltage pulse to the submarine cable under test. The fault diagnosis module collects the low voltage pulse returned by the submarine cable under test. When the arc at the fault point of the submarine cable under test is extinguished and the high resistance state is restored, the low voltage pulse module sends a low voltage pulse to the submarine cable under test again. The fault diagnosis module collects the low voltage pulse returned by the submarine cable under test again. The fault diagnosis module determines the electrical fault information of the submarine cable under test based on the two low voltage pulses returned by the submarine cable under test. This invention can determine the electrical fault information of the submarine cable under test in multiple ways, and combine the mechanical fault information and electrical fault information of the submarine cable under test to determine the comprehensive fault information of the submarine cable under test. This is beneficial to distinguish the fault type of the submarine cable under test and to reduce the misjudgment rate of the fault of the submarine cable under test. Attached Figure Description

[0044] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0045] In the attached diagram:

[0046] Figure 1 This is a schematic diagram of the structure of a photoelectric combined submarine cable fault detection device provided in an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of the main body provided in one embodiment of the present invention;

[0048] Figure 3 This is a schematic diagram of the main body provided in one embodiment of the present invention from another perspective;

[0049] Figure 4 This is a schematic diagram of the high-voltage device provided in one embodiment of the present invention.

[0050] The attached figures are labeled as follows:

[0051] 1-Main body; 11-First outer shell; 111-Optical pulse output interface; 112-Low voltage pulse output interface; 113-First power switch; 114-Reset button; 115-First power interface; 116-First grounding structure; 117-Wi-Fi 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 adjustment knob; 23-Second on / off switch; 24-Pause button; 25-Emergency stop button; 26-Discharge button; 27-Discharge timer; 28-Second grounding structure; 29-Second power interface;

[0053] 3-Housing; 31-Moving wheel; 32-Tie rod structure; 33-Door panel; 34-Partition; 35-Wire hole. Detailed Implementation

[0054] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0055] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0056] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0057] Please see Figure 1 , Figure 1 An embodiment of the present invention provides a photoelectric combined submarine cable fault detection device, which includes a main body 1, a high-voltage device 2, a sampler, and a coupler. The main body 1 includes 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 both electrically connected to the fault diagnosis module; the high-voltage device 2 includes a high-voltage pulse module.

[0058] In the process of fault detection of the submarine cable under test, mechanical faults can be detected using the optical pulse detection method. Specifically, the optical pulse detection method involves sending optical pulses to the optical cable of the submarine cable under test via the optical pulse module of the main body 1. When the optical pulse propagates in the optical cable, it encounters a scattering point and forms Rayleigh scattering light. This backscattered Rayleigh light is collected by the fault diagnosis module as the optical pulse transmitted back from the optical cable.

[0059] The fault diagnosis module calculates the phase difference between the two ends of the vibration section of the optical cable based on the optical pulses returned by the cable under test, thereby achieving quantitative measurement of the cable's tension or strain and obtaining the intensity of the vibration signal. Simultaneously, it can obtain the time-domain and frequency-domain information of the vibration signal, enabling more accurate identification and location of the vibration signal.

[0060] Since mechanical faults in the submarine cable under test often affect the optical cable in terms of strain and vibration, and may even cause breakage, distributed strain and vibration detection of the optical cable can detect the breakpoints and attenuation degradation locations, thereby monitoring the operational status of the submarine cable and obtaining information on its mechanical faults. Furthermore, the shorter the light pulse sent by the optical pulse module to the submarine cable under test, the higher the accuracy of locating the fault point.

[0061] Electrical fault detection of the submarine cable under test can be performed using the low-voltage pulse detection method. Specifically, the low-voltage pulse detection method involves sending a low-voltage pulse to the submarine cable under test via a low-voltage pulse module in the main unit 1, and the fault diagnosis module collecting this transmitted low-voltage pulse. The low-voltage pulse propagates along the length of the submarine cable under test. When it encounters impedance mismatch points such as low resistance or open circuit faults, it is reflected. The reflected low-voltage pulse then propagates back along the length of the submarine cable under test to the main unit 1, where it is collected by the fault diagnosis module.

[0062] The fault diagnosis module calculates the distance to the fault point of the submarine cable under test based on the interval between two round trips of low-voltage pulses to and from the cable, and assuming the transmission speed of the low-voltage pulses in the cable is known. This allows the module to obtain the electrical fault information of the cable under test.

[0063] When the fault point of the submarine cable under test is in a high-resistance state, the method of sending low-voltage pulses to the submarine cable under test using a low-voltage pulse module cannot detect the fault point. In this case, a high-voltage device 2, a sampler, and a coupler are also required.

[0064] Electrical fault detection of the submarine cable under test can also be performed using the high-voltage pulse current detection method. Before implementing the high-voltage pulse current detection method, the sampler is electrically connected to the fault diagnosis module of the main body 1.

[0065] The high-voltage pulse current detection method specifically involves sending a high-voltage pulse to the submarine cable under test via the high-voltage pulse module of high-voltage device 2. The high-voltage pulse propagates along the length of the cable, aiming to break down the fault point and cause it to change from a high-resistance state to a low-resistance or short-circuit state. Current flows from high-voltage device 2 to the cable under test, forming a loop, and then returns to high-voltage device 2. A sampler collects the round-trip current signal and sends it to the fault diagnosis module of the main unit 1. Based on the time interval between the two round-trip current signals to the cable under test, and knowing the transmission speed of the current signal within the cable, the fault diagnosis module can calculate the distance to the fault point, thus obtaining the electrical fault information of the cable under test.

[0066] Electrical fault detection of the submarine cable under test can also be performed using the arc reflection detection method. Before implementing the arc reflection detection method, the coupler is simultaneously connected to the low-voltage pulse module and fault diagnosis module of the main body 1, the high-voltage pulse module of the high-voltage device 2, and the submarine cable under test.

[0067] The arc reflection detection method specifically involves sending a high-voltage pulse from the high-voltage pulse module of high-voltage device 2 to the submarine cable under test via a coupler. The high-voltage pulse propagates along the length of the cable, breaking down the fault point and causing an arc discharge, transitioning the cable from a high-resistance state to a low-resistance or short-circuit state. Subsequently, a low-voltage pulse is sent from the low-voltage pulse module of main body 1 to the cable under test via a coupler. This low-voltage pulse propagates along the length of the cable, and upon reaching a fault point in a low-resistance or short-circuit state, it is reflected. The reflected low-voltage pulse then travels along the length of the cable back to main body 1 via the coupler and is collected by the fault diagnosis module.

[0068] After the arc in the submarine cable under test extinguishes and returns to a high-resistance state, the low-voltage pulse module sends a low-voltage pulse to the cable again via the coupler. The low-voltage pulse travels to the end of the cable away from the low-voltage pulse module and then returns. The low-voltage pulse returning from the cable is then transmitted back to the main unit 1 via the coupler and is collected by the fault diagnosis module. The fault diagnosis module compares the two low-voltage pulses collected from the cable under test to determine the location of the fault point. This allows it to obtain the time interval between the fault point and the low-voltage pulse sending end, and then calculate the distance to the fault point, thus obtaining the electrical fault information of the cable under test.

[0069] The photoelectric combined submarine cable fault detection device of the present invention can determine the electrical fault information of the submarine cable under test in multiple ways, and determine the comprehensive fault information of the submarine cable under test by combining the mechanical fault information and electrical fault information of the submarine cable under test. This is beneficial to distinguish the fault type of the submarine cable under test and to reduce the misjudgment rate of the fault of the submarine cable under test.

[0070] In one example, when implementing the high-voltage pulse current detection method, the impulse-flashover method can be used for high-resistance faults, while the direct-flashover method can be used for flashover faults. The wiring methods for both the impulse-flashover and direct-flashover methods are identical.

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

[0072] In some embodiments, the optoelectronic submarine cable fault detection device further includes a housing 3, with the main body 1 and the high-voltage device 2 all housed within the housing 3. The bottom of the housing 3 is equipped with casters 31, and the outer side wall of the housing 3 is provided with a retractable pull rod structure 32. The casters 31 and the pull rod structure 32 allow the optoelectronic submarine cable fault detection device to be moved to the required detection station, thus improving its portability.

[0073] In some embodiments, the housing 3 is also provided with a door panel 33 that can be opened or closed. The main body 1 and the high voltage device 2 are placed into the housing 3 or taken out from the housing 3 through the door panel 33, thereby realizing the assembly of the optoelectronic submarine cable fault detection device.

[0074] In one example, the pull rod structure 32 and the door panel 33 are disposed on opposite side walls of the housing 3, which helps to prevent the door panel 33 from opening when the photoelectric cable fault detection equipment is moved by the pull rod structure 32.

[0075] In some embodiments, a movable partition 34 is provided inside the housing 3, which can extend or retract into the housing 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 mobility of the partition 34, during the operation of the main body 1, in order to ensure the normal operation of the main body 1, the partition 34 can be extended from inside the housing 3, so that the main body 1 is located outside the housing 3 to accelerate heat dissipation.

[0076] For example, in order to achieve the mobility of the partition 34, the partition 34 can be set on a guide rail, and the movement of the partition 34 can be achieved by moving the partition 34 on the guide rail; or other structures that can achieve the movement of the partition 34, etc.

[0077] In one example, the housing 3 is also provided with a wire passage hole 35, which can be used for the lines on the main body 1 and the high voltage device 2 to enter and exit the housing 3.

[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 all disposed inside the first housing 11 so that the first housing 11 can protect the fault diagnosis module, the optical pulse module and the low-voltage pulse module.

[0079] Furthermore, the first outer casing 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 to both the optical pulse module and the fault diagnosis module. The submarine cable under test is connected to the main body 1 through the optical pulse output interface 111. The optical pulse module sends optical pulses to the submarine cable under test through the optical pulse output interface 111. The optical pulses returned by the submarine cable under test are returned 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 to the low-voltage pulse module and the fault diagnosis module. The submarine cable under test is connected to the main body 1 through the low-voltage pulse output interface 112. The low-voltage pulse module sends low-voltage pulses to the submarine cable under test 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 by the submarine cable under test are returned to the main body 1 through the low-voltage pulse output interface 112 and are collected by the fault diagnosis module. The above structure realizes the transmission of optical pulses and low-voltage pulses between the main body 1 and the submarine cable under test.

[0081] In one example, to achieve the electrical connection between the optical pulse output interface 111 and the submarine cable under test, a first connecting wire is used, with one end connected to the optical pulse output interface 111 and the other end connected to the optical fiber of the submarine cable under test. To achieve the electrical connection between the low-voltage pulse output interface 112 and the submarine cable under test, a second connecting wire is used, with one end connected to the low-voltage pulse output interface 112 and the other end connected to the submarine cable under test.

[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 submarine cable under test. The first connecting line includes, but is not limited to, various types of fiber optic patch cords, and the second connecting line includes, but is not limited to, test wires.

[0083] In some embodiments, the main unit 1 further includes an operation display screen 12, which is electrically connected to the fault diagnosis module, the optical pulse module, and the low-voltage pulse module. The operator can adjust the parameters of the optical pulses sent by the optical pulse module and the parameters of the low-voltage pulses sent by the low-voltage pulse module through the operation display screen 12. The operation display screen 12 can also display the comprehensive fault information of the submarine cable under test, ultimately determined by the fault diagnosis module, for the operator's convenience. It should be noted that the operation display screen 12 can also be used for other touchscreen operations by the operator.

[0084] For example, the operation display screen 12 is disposed on the outer surface of the first housing 11 and located on the upper surface of the first housing 11, so that the operator can operate the equipment and view the diagnostic results on the operation display screen 12.

[0085] In some embodiments, the main body 1 further includes a heat dissipation structure 13, which is disposed on the first housing 11. The heat dissipation structure 13 can dissipate heat from the fault diagnosis module, the optical pulse module and the low-voltage pulse module to ensure the normal operation of the main body.

[0086] For example, the heat dissipation structure 13 can be configured as a structure with heat dissipation function, such as a cooling fan.

[0087] In some embodiments, the first housing 11 is further provided with a first power switch 113, a reset button 114, a first power interface 115, and a first grounding structure 116. The first power interface 115 enables the main unit 1 to be powered on; the first power switch 113 enables the main unit 1 to be turned on and off; in the event of an abnormality or crash of the main unit 1, the reset button 114 enables the main unit 1 to be restarted; and the first grounding structure 116 provides electric shock protection for the main unit 1, which helps to ensure the safety of the operator.

[0088] For example, the first grounding structure 116 can be configured as a grounding post, etc.

[0089] In one example, the main unit 1 is also equipped with a Wi-Fi interface 117, a USB interface 118, and an indicator light 119. The Wi-Fi interface 117 enables the main unit 1 to connect to the network, the USB interface 118 enables the export of data from the main unit 1, and the indicator light 119 includes a power indicator light, an event indicator light, a fault indicator light, and a running indicator light.

[0090] The power indicator light illuminates when the main unit 1 is powered on. The event indicator light briefly illuminates whenever the operator performs any operation on the main unit 1, indicating that the current operation has been triggered; and after the operation is completed, the event indicator light illuminates briefly again, indicating that the current operation process has ended. When the main unit 1 is running normally, the operation indicator light illuminates; when the main unit 1 malfunctions, the operation indicator light goes out, and the fault indicator light illuminates to alert the operator.

[0091] In some embodiments, the high-voltage device 2 further includes a second housing 21, with the high-voltage pulse module located inside the second housing 21, so that the second housing 21 serves to protect the high-voltage pulse module. The second housing 21 is provided with a high-voltage pulse output interface 211, which is electrically connected to the high-voltage pulse module. The submarine cable under test is connected to 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 submarine cable under test through the high-voltage pulse output interface 211.

[0092] In one example, to establish an electrical connection between the high-voltage pulse output interface 211 and the submarine cable under test, a third connecting line can be used. One end of the third connecting line is connected to the high-voltage pulse output interface 211, and the other end is connected to the submarine cable under test. With the third connecting line, to collect the current signal traveling to and from the submarine cable under test, the sampling end of the sampler is placed parallel to the third connecting line. It should be noted that the submarine cable under test is directly grounded, and the current flowing from the high-voltage device 2 to the submarine cable under test returns directly to the high-voltage device 2 through the grounding wire, so that the sampler can collect the current signal returning through the submarine cable under test.

[0093] In one example, the sampler is electrically connected to the fault diagnosis module via a low-voltage pulse output interface 112 connected to the main body 1. It should be noted that the second connecting cable between the low-voltage pulse output interface 112 and the submarine cable under test has been disconnected before connecting the sampler to the low-voltage pulse output interface 112.

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

[0095] In one example, to achieve electrical connection between the coupler and the main unit 1, the high-voltage device 2, and the submarine cable under test, the first end of the coupler is connected to the low-voltage pulse output interface of the main unit 1, the second end of the coupler is connected to the high-voltage pulse output interface of the high-voltage device 2, and the third end of the coupler is connected to the submarine cable under test. For operator safety, the fourth end of the coupler is grounded. It should be noted that no other electrical connection wires are connected to either the low-voltage pulse output interface or the high-voltage pulse output interface during the electrical connection process.

[0096] In some embodiments, the high-voltage device 2 further includes a voltage regulating knob 22, an ammeter 212, and a voltmeter 213 disposed on the second housing 21. The voltage regulating knob 22 can adjust the voltage value output by the high-voltage pulse module, and the voltage value is displayed by the voltmeter 213, so that the operator can accurately read and output the required voltage value, thereby achieving breakdown of the fault point of the submarine cable under test. For example, during the voltage adjustment process, the required voltage can be tested and the voltage adjustment operation can be performed step by step. The ammeter 212 is used to detect the current value applied to the circuit of the submarine cable under test, and the change in current can be used to determine whether there is an abnormality in the high-voltage device 2 or the current circuit.

[0097] Furthermore, by observing the values ​​of ammeter 212 and voltmeter 213, it can be determined whether the fault point of the submarine cable under test has been broken down. When the fault point of the submarine cable under test is fully discharged, the value of voltmeter 213 instantly drops to zero, while the value of ammeter 212 instantly increases. During the discharge process, when the values ​​of ammeter 212 and voltmeter 213 are both 0, it indicates that the high-voltage device 2 has completed the discharge. If the discharge time far exceeds the normal discharge time, but the value of ammeter 212 is still not 0, then the high-voltage device 2 should be considered to have an abnormality.

[0098] In some embodiments, the second housing 21 is further provided with a second power switch 23, a pause button 24, an emergency stop button 25, a discharge button 26, a discharge timer 27, a second grounding structure 28, and a second power interface 29. The second power interface 29 enables the high-voltage device 2 to be powered on, the second power switch 23 enables the high-voltage device 2 to be turned on and off, and the second grounding structure 28 provides electric shock protection for the high-voltage device 2, thus ensuring the safety of operators.

[0099] After the high-voltage device 2 is turned on, the pause button 24 needs to be pressed to ensure that the high-voltage device 2 will not generate high voltage immediately or accidentally after being powered on, so as to cut off the high-voltage pulse module, prevent the high-voltage pulse module from outputting high-voltage pulses, and put the high-voltage pulse module into a safe standby state.

[0100] Subsequently, the discharge time is set via discharge timer 27. For example, the discharge time can be set to any suitable time, such as 6 seconds. Setting the discharge time to 6 seconds means that the high-voltage pulse module sends a high-voltage pulse to the submarine cable under test for 6 seconds and then automatically discharges. The operator observes whether the fault point of the submarine cable under test has been broken down and adjusts in time whether it is necessary to further increase the voltage for the next injection.

[0101] Once the wiring of the high-voltage device 2 is completed, the discharge time is set, and there are no abnormalities, the pause button 24 can be pressed again so that the high-voltage device 2 can output the high-voltage pulse of the corresponding voltage level that has been set in advance.

[0102] When the high-voltage device 2 experiences an abnormal or dangerous situation during operation, pressing the emergency stop button 25 will directly cut off the power input of the high-voltage pulse module and trigger the discharge protection circuit to quickly release the high-voltage energy stored in the capacitor.

[0103] After the fault test of the submarine cable under test is completed, in order to avoid residual high voltage in the high voltage device 2, the discharge button 26 should be pressed to actively release the pressure, so as to prevent the operator from accidentally touching the high voltage device 2 and causing an electric shock accident.

[0104] For example, the second grounding structure 28 can be configured as a grounding post.

[0105] An embodiment of the present invention also provides a photoelectric combined submarine cable fault detection method, which is applicable to the aforementioned photoelectric combined submarine cable fault detection equipment. The submarine cable fault detection method may include steps S110 to S200, which are described in detail below:

[0106] Step S110: Connect the submarine cable to be tested to the main body 1.

[0107] In some embodiments, before detecting the location of the fault point of the submarine cable under test, it is necessary to complete the electrical connection between the submarine cable under test and the main body 1. Connect one end of the first connecting line to the optical pulse output interface 111 of the main body 1 and the other end to the optical cable of the submarine cable under test; connect one end of the second connecting line to the low voltage pulse output interface 112 of the main body 1 and the other end to the submarine cable under test, thereby realizing the electrical connection between the submarine cable under test and the main body 1.

[0108] Step S120: Control the optical pulse module to send continuous optical pulses to the submarine cable under test, and the low-voltage pulse module to send low-voltage pulses to the submarine cable under test.

[0109] In some embodiments, the operator can select the transmission speed of the optical pulse and low-voltage pulse in the submarine cable to be tested via the operation display screen 12, and adjust the parameters of the emitted optical pulse and low-voltage pulse. After the settings are completed, the operator clicks "Sampling" on the operation display screen 12 to cause the optical pulse module of the main body 1 to send continuous optical pulses to the submarine cable under test, and the low-voltage pulse module of the main body 1 to send low-voltage pulses to the submarine cable under test.

[0110] In step S130, the control fault diagnosis module collects the optical pulses returned by the submarine cable under test and determines the mechanical fault information of the submarine cable under test based on the optical pulses; the control fault diagnosis module collects the low-voltage pulses traveling to and from the submarine cable under test and determines the electrical fault information of the submarine cable under test based on the low-voltage pulses.

[0111] In some embodiments, when an optical pulse propagates in the optical cable, it encounters a scattering point and forms backscattered Rayleigh light. This backscattered Rayleigh light is collected by the fault diagnosis module as the optical pulse transmitted back from the cable. The fault diagnosis module calculates the phase difference between the two ends of the vibrating section of the cable based on the optical pulse returned from the cable under test, thereby achieving quantitative measurement of the cable's tension or strain and obtaining the intensity of the vibration signal. Simultaneously, it can obtain the time-domain and frequency-domain information of the vibration signal, enabling more accurate identification and location of the vibration signal.

[0112] Since mechanical faults in the submarine cable under test often affect the optical cable in terms of strain and vibration, and may even cause the optical cable to break, distributed strain and vibration detection of the optical cable can detect the break points and attenuation deterioration locations of the optical cable, thereby detecting the operating status of the submarine cable under test and obtaining information on its mechanical faults.

[0113] When the low-voltage pulse module sends a low-voltage pulse to the submarine cable under test, the fault diagnosis module collects the transmitted low-voltage pulse. The low-voltage pulse propagates along the length of the submarine cable under test. When it encounters impedance mismatch points such as low resistance or open circuit faults, it is reflected. The reflected low-voltage pulse is transmitted back to the main body 1 along the length of the submarine cable under test and is collected by the fault diagnosis module.

[0114] The fault diagnosis module calculates the distance to the fault point of the submarine cable under test based on the interval between two round trips of low-voltage pulses to and from the cable, and assuming the transmission speed of the low-voltage pulses in the cable is known. This allows the module to obtain the electrical fault information of the cable under test.

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

[0116] In some embodiments, when the fault point of the submarine cable under test is in a high-resistance state, a low-voltage pulse module is used to send a low-voltage pulse to the submarine cable under test. That is, the low-voltage pulse detection method cannot detect the fault point of the submarine cable under test. Therefore, other methods are needed to detect the fault point of the submarine cable under test, such as the high-voltage pulse current detection method, which requires the application of high-voltage device 2 and sampler.

[0117] Before testing the submarine cable under test using the high-voltage device 2 and the sampler, the electrical connection between the submarine cable under test and the high-voltage device 2 must be completed. Connect one end of the third connecting line to the high-voltage pulse output interface 211 of the high-voltage device 2, and the other end to the submarine cable under test. The electrical connection between the sampler and the main unit 1 also needs to be completed. Connect the sampler to the low-voltage pulse output interface 112 of the main unit 1 so that the sampler's signal can be fed back to the fault diagnosis module. With the third connecting line present, in order to collect the current signal traveling to and from the submarine cable under test, place the sampling end of the sampler parallel to the third connecting line.

[0118] It should be noted that the connection between the high-voltage device 2 and the submarine cable under test can be made either when the high-voltage device 2 is not powered on or turned off, or after the high-voltage device 2 is powered on. When making the connection after the high-voltage device 2 is powered on, the pause button 24 of the high-voltage device 2 must be pressed to ensure that the high-voltage device 2 does not output high voltage, thus ensuring the safety of the operator.

[0119] Step S150: Control the high-voltage pulse module to send a high-voltage pulse to the submarine cable under test. After an arc discharge breakdown occurs at the fault point of the submarine cable under test, control the sampler to collect the current signal traveling back and forth to the submarine cable under test, 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 under test 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, the operator presses the pause button 24 and controls the high-voltage pulse module of the high-voltage device 2 to send a high voltage pulse of the corresponding voltage level to the submarine cable under test.

[0121] The high-voltage pulse propagates along the length of the submarine cable under test, so as to break down the fault point of the submarine cable under test through the high-voltage pulse, causing the fault point to change from a high-resistance state to a low-resistance or short-circuit state. The circuit will generate a large current due to the breakdown. At this time, the sampler collects the current signal traveling back and forth between 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 down, gradually increase the voltage level of the high-voltage pulse and repeat the above operation.

[0123] Step S160: The control fault diagnosis module determines electrical fault information based on the current signal.

[0124] In some embodiments, the fault diagnosis module can calculate the distance to the fault point of the submarine cable under test based on the time it takes for the current to travel back and forth from the pulse port to the fault point once, and given the known speed of the current signal in the submarine cable under test, thereby obtaining the electrical fault information of the submarine cable under test.

[0125] Step S170: Connect the coupler to the main body 1, the high voltage device 2 and the submarine cable under test simultaneously.

[0126] In some embodiments, when the fault point of the submarine cable under test is in a high-resistance state, the fault point can also be detected by arc reflection detection, which requires the application of the main body 1, the high-voltage device 2, and a 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 submarine cable under test, thus achieving electrical connection between the main body 1, the high-voltage device 2, and the submarine cable under test. The fourth end of the coupler is grounded to ensure operator safety.

[0127] It should be noted that the connection between the high-voltage device 2 and the coupler can be made either when the high-voltage device 2 is not powered on or off, or after the high-voltage device 2 is powered on. When making the connection after the high-voltage device 2 is powered on, the pause button 24 of the high-voltage device 2 must be pressed to ensure that the high-voltage device 2 does not output high voltage, thus ensuring the safety of the operator.

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

[0129] In some embodiments, after the main body 1, high voltage device 2, coupler and submarine 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 adjustment knob 22. Then, the operator presses the pause button 24 and controls the high voltage pulse module of the high voltage device 2 to send a high voltage pulse to the submarine cable under test through the coupler.

[0130] A high-voltage pulse propagates along the length of the submarine cable under test, aiming to break down the fault point and cause an arc discharge at the fault point, transitioning it from a high-resistance state to a low-resistance or short-circuit state. Subsequently, a low-voltage pulse is sent to the submarine cable under test via a coupler through the low-voltage pulse module of the main body 1. The low-voltage pulse propagates along the length of the submarine cable under test, and when it reaches the fault point in the low-resistance or short-circuit state, it is reflected. The reflected low-voltage pulse is then transmitted back to the main body 1 along the length of the submarine cable under test via the coupler and is collected by the fault diagnosis module.

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

[0132] In step S190, the fault diagnosis module determines the electrical fault information based on the two low-voltage pulses returned by the submarine cable under test.

[0133] In some embodiments, the fault diagnosis module compares the low-voltage pulses returned by the submarine cable under test from two consecutive acquisitions to determine the location of the fault point in the submarine cable under test. This allows the module to obtain the time interval between the fault point location and the low-voltage pulse emitting end, and then calculate the distance to the fault point in the submarine cable under test, thereby obtaining the electrical fault information of the submarine cable under test.

[0134] It should be noted that when detecting electrical fault information in the submarine cable under test, the low-voltage pulse detection method can be used first, followed by the high-voltage pulse current detection method or the electric arc reflection detection method.

[0135] In some embodiments, after the fault detection of the submarine cable under test is completed, it is necessary to click "Stop Sampling" on the operation display screen 12 of the main unit 1, rotate the voltage adjustment knob 22 to return the output voltage to zero, press the discharge button 26 of the high voltage device 2 until the voltmeter 213 and the ammeter 212 are both returned to zero, and then use the discharge rod to discharge the submarine cable under test to avoid residual voltage on the high voltage device 2 and the submarine cable under test, so as to ensure the safety of the operator.

[0136] In step S200, the control fault diagnosis module determines the comprehensive fault information of the submarine cable under test based on the determined mechanical fault information and electrical fault information.

[0137] In some embodiments, after the fault diagnosis module determines the mechanical fault information and electrical fault information of the submarine cable under test according to steps S110 to S190, the control fault diagnosis module further determines the comprehensive fault information of the submarine cable under test based on the determined mechanical fault information and electrical fault information, so as to comprehensively evaluate the fault of the submarine cable under test, and not be limited to mechanical fault information or electrical fault information.

[0138] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A photoelectric combined method for detecting submarine cable faults, characterized in that, The method includes: Connect the submarine cable to be tested to the main body; The control optical pulse module sends continuous optical pulses to the submarine cable under test, and the low-voltage pulse module sends low-voltage pulses to the submarine cable under test; The control fault diagnosis module collects optical pulses returned by the submarine cable under test and determines the mechanical fault information of the submarine cable under test based on the optical pulses; the control fault diagnosis module collects low-voltage pulses traveling to and from the submarine cable under test and determines the electrical fault information of the submarine cable under test based on the low-voltage pulses. The submarine cable to be tested is connected to the high-voltage device, and the sampler is connected to the main body; The high-voltage pulse module sends a high-voltage pulse to the submarine cable under test. After an arc discharge breakdown occurs at the fault point of the submarine cable under test, the sampler is controlled to collect the current signal traveling back and forth to the submarine cable under test and send the current signal to the fault diagnosis module. The fault diagnosis module is controlled to determine the electrical fault information based on the current signal; The coupler is simultaneously connected to the main body, the high-voltage device, and the submarine cable under test. The high-voltage pulse module sends a high-voltage pulse to the submarine cable under test. After an arc discharge breakdown occurs at the fault point of the submarine cable under test, the low-voltage pulse module sends a low-voltage pulse to the submarine cable under test, and the fault diagnosis module collects the low-voltage pulse returned by the submarine cable under test. After the arc on the submarine cable under test is extinguished, the low-voltage pulse module sends a low-voltage pulse to the submarine cable under test again, and the fault diagnosis module collects the low-voltage pulse returned by the submarine cable under test. The fault diagnosis module determines the electrical fault information based on the two low-voltage pulses returned by the submarine cable under test. The fault diagnosis module determines the comprehensive fault information of the submarine cable under test based on the determined mechanical fault information and electrical fault information.

2. The optoelectronic combined submarine cable fault detection method according to claim 1, characterized in that, Connecting the submarine cable to be tested to the main body includes: The optical pulse output interface of the main unit is connected to the submarine cable under test via a first connecting line, and the low-voltage pulse output interface of the main unit is connected to the submarine cable under test via a second connecting line.

3. The optoelectronic combined submarine cable fault detection method according to claim 1, characterized in that, Connecting the submarine cable to be tested to the high-voltage device and connecting the sampler to the main body includes: The high-voltage pulse output interface of the high-voltage device is connected to the submarine cable under test via a third connecting line. Connect the sampler to the low-voltage pulse output interface of the main body, and place the sampling end of the sampler parallel to the third connecting line.

4. The photoelectric combined submarine cable fault detection method according to claim 1, characterized in that: Connecting the coupler simultaneously to the main body, the high-voltage device, and the submarine cable under test 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 under test.

5. The optoelectronic combined submarine cable fault detection method according to claim 1, characterized in that: The method further includes discharging the circuit pressurized by the high-voltage device after the fault detection of the submarine cable under test is completed by the high-voltage device.

6. A photoelectric combined submarine cable fault detection device, used to implement the photoelectric combined submarine cable fault detection method as described in any one of claims 1-5, characterized in that, include: The main body includes a fault diagnosis module, and an optical pulse module and a low-voltage pulse module electrically connected to the fault diagnosis module. The optical pulse module is used to send optical pulses to the submarine cable under test, and the low-voltage pulse module is used to send low-voltage pulses to the submarine cable under test. The high-voltage device includes a high-voltage pulse module, which is used to send high-voltage pulses to the submarine cable under test. A sampler is used to be electrically connected to the fault diagnosis module and to collect the round-trip current signal on the submarine cable under test, so as to send the current signal to the fault diagnosis module. A coupler is used to electrically connect with the fault diagnosis module, the low-voltage pulse module, the high-voltage pulse module and the submarine cable under test. The low-voltage pulse module sends two low-voltage pulses to the submarine cable under test through the coupler. The fault diagnosis module is used to collect the two low-voltage pulses returned by the submarine cable under test through the coupler. The high-voltage pulse module sends high-voltage pulses to the submarine cable under test through the coupler. The fault diagnosis module collects optical pulses returned by the submarine cable under test, low-voltage pulses and current signals traveling to and from the submarine cable under test, and two low-voltage pulses returned by the coupler, in order to determine the comprehensive fault information of the submarine cable under test.

7. The optoelectronic combined submarine cable fault detection device according to claim 6, characterized in that: The main body also includes a first outer shell, and the fault diagnosis module, the optical pulse module and the low-voltage pulse module are all disposed inside the first outer shell. The first outer shell is provided with an optical pulse output interface electrically connected to both the optical pulse module and the fault diagnosis module, and a low-voltage pulse output interface electrically connected to both the low-voltage pulse module and the fault diagnosis module.

8. The optoelectronic combined submarine cable fault detection device according to claim 7, characterized in that: The optical pulse output interface is connected to the submarine cable under test via a first connecting line, and the low-voltage pulse output interface is connected to the submarine cable under test via a second connecting line.

9. The optoelectronic combined submarine cable fault detection device according to claim 7, characterized in that: The sampler is used to connect to the low-voltage pulse output interface to electrically connect the sampler to the fault diagnosis module.

10. The optoelectronic combined submarine cable fault detection device according to claim 7, characterized in that: The main unit also includes an operation display screen electrically connected to the fault diagnosis module, the optical pulse module, and the low-voltage pulse module. 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.

11. The optoelectronic combined submarine cable fault detection device according to claim 10, characterized in that: The operation display screen is disposed on the first housing and located on the upper surface of the first housing.

12. The optoelectronic combined submarine cable fault detection device according to claim 7, characterized in that: The main body also includes a heat dissipation structure, which is disposed on the first outer shell.

13. The optoelectronic combined submarine cable fault detection device according to claim 12, characterized in that: The first housing is also provided with a first power switch, a reset button, a first power interface and a first grounding structure.

14. The optoelectronic combined submarine cable fault detection device according to claim 7, characterized in that: The high-voltage device also includes a second housing, the high-voltage pulse module is located inside the second housing, and the second housing is provided with a high-voltage pulse output interface that is electrically connected to the high-voltage pulse module.

15. The optoelectronic combined submarine cable fault detection device according to claim 14, characterized in that: The high-voltage pulse output interface is connected to the submarine cable under test via a third connecting line, and the sampling end of the sampler is arranged parallel to the third connecting line.

16. The optoelectronic combined submarine cable fault detection device according to claim 14, 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 under test, and the fourth end of the coupler is grounded.

17. The optoelectronic combined submarine cable fault detection device according to claim 14, characterized in that: The high-voltage device also includes a voltage adjustment knob, an ammeter, and a voltmeter disposed on the second housing. The voltage adjustment 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 circuit under test.

18. The optoelectronic combined submarine cable fault detection device according to claim 17, characterized in that: The second housing is also equipped with a second power switch, a pause button, an emergency stop button, a discharge button, a discharge timer, a second grounding structure, and a second power interface.

19. The optoelectronic combined submarine cable fault detection device according to any one of claims 6-18, characterized in that: The optoelectronic submarine cable fault detection device also includes a housing, in which the main body and the high-voltage device are located. The bottom of the housing is provided with casters, and the outer side wall of the housing is provided with a pull rod structure.

20. The optoelectronic combined submarine cable fault detection device according to claim 19, characterized in that: The housing is provided with a door panel, through which the main body and the high-voltage device can be placed into or removed from the housing.

21. The optoelectronic combined submarine cable fault detection device according to claim 20, characterized in that: The housing is provided with a partition that can extend or retract into the housing, and the main body is placed on the partition, while the high-voltage device is placed below the partition.

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