Testing method and testing device for high-voltage submarine cable joint

Abstract

The invention provides a testing method and a testing device for a high-voltage submarine cable joint, and relates to the technical field of high-voltage submarine cables. According to the testing method, the semi-finished flexible joint can be tested, whether the semi-finished flexible joint is qualified or not can be judged by observing whether the exposed insulating layer has defects or not after testing, and whether the semi-finished flexible joint can be further manufactured into a finished product or not can be judged. If the soft joint semi-finished product is unqualified in test, only the soft joint semi-finished product needs to be manufactured again, and compared with tedious operation of stripping all structures in a traditional method, the scheme of the invention can discover the defects of the insulating layer in advance, avoids reworking of subsequent recovery work, greatly saves reworking time, and improves production efficiency. And the test efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage submarine cables, and more particularly, to a test method and a test device for a high-voltage submarine cable joint. Background Art

[0002] Currently, the mainstream withstand voltage partial discharge test for flexible joints usually needs to be carried out in a dedicated high-voltage partial discharge chamber, and the test object is the completed flexible joint. The specific test process includes connecting the flexible joint to the high-voltage test circuit, applying a specified voltage level, and monitoring whether there is a partial discharge signal and whether the discharge amount exceeds the limit value.

[0003] However, although the above method can effectively evaluate the insulation performance of the flexible joint, it has certain limitations. Since the test is carried out after the flexible joint is manufactured, once it is found that the partial discharge exceeds the standard or the insulation performance does not meet the requirements, the flexible joint often needs to be remanufactured, which not only increases the production cost, but also prolongs the production cycle and reduces the production efficiency. Summary of the Invention

[0004] An object of the present invention is to provide a test method and a device for a high-voltage submarine cable joint, which can complete the test simply and at low cost and improve the test efficiency.

[0005] Embodiments of the present invention may be implemented as follows:

[0006] In a first aspect, the present invention provides a test method for a high-voltage submarine cable joint, including:

[0007] Processing the high-voltage submarine cable to form a semi-finished flexible joint with an exposed insulating layer;

[0008] Placing the exposed insulating layer in an insulating box to make the insulating layer in an insulating state;

[0009] Wrapping a copper strip around the outer periphery of the insulating layer to form a copper strip layer on the outer periphery of the insulating layer;

[0010] Adjusting a temperature adjusting element and a pressure adjusting element so that the temperature and pressure in the insulating box are respectively within a target temperature range and a target pressure range;

[0011] Connecting the copper strip layer to the high-voltage terminal through a clamping ring and applying a voltage to the copper strip layer through the high-voltage terminal;

[0012] Observing the state of the insulating layer.

[0013] In an alternative embodiment, the step of adjusting the temperature adjusting element and the pressure adjusting element so that the temperature and pressure in the insulating box are respectively at a temperature target value and a pressure target value includes:

[0014] Detect whether the temperature inside the insulating box is within the target temperature range through a thermometer;

[0015] If the temperature is not within the target temperature range, temperature compensation is achieved through a temperature regulating element so that the temperature inside the insulating box is within the target temperature range.

[0016] In an alternative embodiment, the steps of adjusting the temperature regulating element and the air pressure regulating element so that the temperature and pressure inside the insulating box are respectively at the temperature target value and the pressure target value include:

[0017] Detect whether the air pressure inside the insulating box is within the target pressure range through a barometer;

[0018] If the air pressure is not within the target pressure range, air pressure compensation is achieved through an air pressure regulating element so that the air pressure inside the insulating box is within the target pressure range.

[0019] In an alternative embodiment, the steps of placing the exposed insulating layer inside the insulating box so that the insulating layer is in an insulating state include:

[0020] Place the semi-finished soft joint on the lifting platform of the insulating box.

[0021] In an alternative embodiment, the steps of connecting the copper tape layer to the high-voltage terminal through a clamping ring and applying a voltage to the copper tape layer through the high-voltage terminal further include:

[0022] Adjust the lifting platform to move upward so that the clamping ring is connected to the copper tape layer.

[0023] In an alternative embodiment, the steps of placing the exposed insulating layer inside the insulating box so that the insulating layer is in an insulating state specifically include:

[0024] Inject an inert gas into the insulating box so that the insulating layer is in an insulating state.

[0025] In an alternative embodiment, the length range of the exposed insulating layer is 1700 - 2300 mm, and the copper tape layer is located in the middle of the insulating layer with a length range of 70 - 130 mm.

[0026] In an alternative embodiment, the steps of connecting the copper tape layer to the high-voltage terminal through a clamping ring and applying a voltage to the copper tape layer through the high-voltage terminal further include:

[0027] Ground the two ends of the high-voltage terminal and the semi-finished soft joint.

[0028] In an alternative embodiment, the steps of processing a high-voltage submarine cable so that the high-voltage submarine cable forms a semi-finished soft joint with an exposed insulating layer include:

[0029] Strip the ends of two high-voltage submarine cables to be connected, so that the conductor cores are exposed;

[0030] Weld the two conductor cores by welding;

[0031] Longitudinally wrap the inner shielding layer around the outer periphery of the conductor core and heat it to melt and form;

[0032] Uniformly wind the insulating layer around the outer periphery of the inner shielding layer and heat it to melt and form.

[0033] In a second aspect, the present invention provides a test device for a high-voltage submarine cable joint. The test device for a high-voltage submarine cable joint according to any one of the foregoing embodiments includes:

[0034] An insulating box;

[0035] A temperature regulating element, which is connected to the insulating box and is used to regulate the temperature of the inner cavity of the insulating box;

[0036] A pressure regulating element, which is connected to the insulating box and is used to regulate the air pressure of the inner cavity of the insulating box;

[0037] A pressurizing element, which includes a high-voltage terminal and a clamping ring located in the insulating box, and the high-voltage terminal is connected to the clamping ring.

[0038] The beneficial effects of the test method and device for a high-voltage submarine cable joint provided by the embodiments of the present invention include:

[0039] The present invention provides a test method and a test device for a high-voltage submarine cable joint. This test method can test the soft joint semi-finished product. By observing whether there are defects on the exposed insulating layer after the test, it can be judged whether the soft joint semi-finished product is qualified and whether it can be further made into a finished product. If the soft joint semi-finished product in this application fails the test, this application only needs to remanufacture the soft joint semi-finished product. Compared with the cumbersome operation of stripping all structures in the traditional method, the solution of this application can detect defects in the insulating layer in advance, avoid rework in subsequent restoration work, greatly save rework time, and improve test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 It is a schematic flow chart of the test method for the soft joint semi-finished product provided in this embodiment;

[0042] Figure 2 Schematic diagram of the sub - step process of step S100 of the soft joint semi - finished product testing method provided for this embodiment;

[0043] Figure 3 Schematic diagram of the sub - step process of step S300 of the soft joint semi - finished product testing method provided for this embodiment;

[0044] Figure 4 Schematic diagram of the structure of the soft joint semi - finished product testing device provided for this embodiment.

[0045] Icon: 10 - testing device; 30 - high - voltage submarine cable; 31 - conductor core; 33 - inner shielding layer; 35 - insulating layer; 37 - outer shielding layer; 100 - insulating box; 110 - universal wheel; 120 - lifting platform; 130 - hand - operated elevator; 210 - thermometer; 230 - barometer; 310 - temperature regulating element; 330 - pressure regulating element; 400 - high - voltage terminal. Detailed implementation manners

[0046] In the voltage withstand partial discharge test of the soft joint in the related art, the test object is the completed soft joint. If the test is unqualified, the soft joint often needs to be remade, which has the problems of time - consuming and labor - intensive.

[0047] In view of the above problems, the present invention provides a testing method and a testing device for high - voltage submarine cable joints, which can complete the test simply and at low cost and can improve the test efficiency.

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0050] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0051] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0052] In addition, if terms such as "first", "second", etc. are only used for distinguishing descriptions, they should not be construed as indicating or implying relative importance.

[0053] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.

[0054] The following will introduce in detail the overall structure, working principle, and technical effects achieved by the test device 10 for high-voltage submarine cable joints provided by the present invention through embodiments and in combination with the drawings, as well as the detailed steps, implementation principles, and technical effects achieved by the supporting test methods.

[0055] Please refer to Figure 1 , Figure 1 , which is a schematic flow chart of the test method for the soft joint semi-finished product provided in this embodiment. The present invention provides a test method for the soft joint semi-finished product, which is used for the withstand voltage partial discharge test of the soft joint semi-finished product, and includes the following steps:

[0056] Step S100: Process the high-voltage submarine cable 30 so that the high-voltage submarine cable 30 forms a soft joint semi-finished product with the insulating layer 35 exposed.

[0057] In step S100, by forming the soft joint semi-finished product and exposing the insulating layer 35, it can ensure that the insulating layer 35 is directly tested, ensuring the pertinence and accuracy of the test.

[0058] Step S200: Place the exposed insulating layer 35 in the insulating box 100 so that the insulating layer 35 is in an insulated state.

[0059] In step S200, when the insulating layer 35 to be tested is placed in the insulating box 100, it can effectively prevent the risk of electric leakage or short circuit during the test and ensure the safety of the operator. In addition, compared with the traditional high-voltage partial discharge chamber test, the insulating box 100 provided in this application simplifies the test environment and can be correspondingly applicable to outdoor operations.

[0060] Step S300: Wind the copper tape around the outer periphery of the insulating layer 35 so that a copper tape layer is formed on the outer periphery of the insulating layer 35.

[0061] In step S300, since copper has excellent electrical conductivity and can effectively transmit current, the copper strip layer can be used as a conductive element to simulate the actual working environment of the semi-finished soft joint in the test.

[0062] Step S400: Adjust the temperature adjustment element 310 and the air pressure adjustment element 330 so that the temperature and air pressure in the insulating box 100 are respectively within the target temperature range and the target pressure range.

[0063] In step S400, based on the adjustment of the temperature adjustment element 310 and the air pressure adjustment element 330, the withstand voltage partial discharge test can be carried out at different temperatures, and the corresponding test results can be obtained. It should be noted that the temperature and air pressure inside the insulating box 100 are interrelated, and the target temperature range and the target pressure range of the test correspond one by one.

[0064] Step S500: Connect the copper strip layer to the high-voltage terminal 400 through a ferrule, and apply a voltage to the copper strip layer through the high-voltage terminal 400.

[0065] In step S500, using a ferrule to electrically connect the copper strip layer and the high-voltage terminal 400 can ensure good electrical contact between the high-voltage terminal 400 and the copper strip layer, and improve the test reliability. Optionally, the voltage terminal is connected to a transformer to apply a corresponding specified voltage according to the voltage level of the high-voltage submarine cable 30. Optionally, the ferrule is a metal ferrule.

[0066] S600: Observe the state of the insulating layer 35.

[0067] In step S600, if a breakdown state appears on the insulating layer 35, it indicates that there is a quality defect in the insulating layer 35; if no breakdown state appears on the insulating layer 35, it indicates that the semi-finished soft joint is qualified and can be further processed into a finished product. In addition, it should also be noted that once there is a quality defect in the insulating layer 35, the discharge part will only appear at the insulating layer 35 at both ends of the pressurized part, which can be observed in time with the naked eye.

[0068] The above steps S100 to S600 illustrate that the test method provided by this application can test the semi-finished soft joint. By observing whether there are defects on the exposed insulating layer 35 after the test, it can be judged whether the semi-finished soft joint is qualified and whether it can be further processed into a finished product. If the semi-finished soft joint test in this application is unqualified, this application only needs to remanufacture the semi-finished soft joint. Compared with the cumbersome operation of stripping all structures in the traditional method, the solution of this application can detect the defects of the insulating layer 35 in advance, avoid the rework of subsequent restoration work, greatly save the rework time, and improve the test efficiency.

[0069] Further, asFigure 2 As shown, the steps for processing the high-voltage submarine cable 30 to form a semi-finished soft joint with the insulating layer 35 exposed (i.e., step S100) include:

[0070] Step S110, strip the ends of two high-voltage submarine cables 30 to be connected to expose the conductor cores 31.

[0071] Step S120, weld the two conductor cores 31 together.

[0072] In step S120, through the welding process, the conductor cores 31 of the two high-voltage submarine cables 30 at both ends are strongly connected.

[0073] Step S130, longitudinally wrap the inner shielding layer 33 around the outer periphery of the conductor core and heat it to melt and form.

[0074] In step S130, by heating and melting the wrapped inner shielding layer 33, the restoration of the inner shielding layer 33 is achieved.

[0075] Step S140, evenly wind the insulating layer 35 around the outer periphery of the inner shielding layer 33 and heat it to melt and form.

[0076] In step S140, by heating and melting the wound insulating layer 35, the restoration of the insulating layer 35 is achieved.

[0077] Based on the above settings, semi-finished soft joints are formed at the two connected ends of the two high-voltage submarine cables 30, where the insulating layer 35 is exposed on the outside for partial discharge testing. If the insulating layer 35 breaks down, it indicates that the semi-finished soft joint is unqualified. At this time, the insulating layer 35 and the inner shielding layer 33 are stripped, and the conductor core 31, the inner shielding layer 33, and the insulating layer 35 are restored again to make a semi-finished soft joint again and conduct the test again. After the test passes, an outer shielding layer 37 can be correspondingly wrapped outside the insulating layer 35 to make a finished soft joint.

[0078] In addition, it should be noted that in this application, the thickness of the insulating layer 35 after restoration is the same as that of the insulating layer 35 in the main body (non-end part) of the high-voltage submarine cable 30, and there is no need to leave a thickness margin of 0.5 mm to ensure the passing rate in traditional tests.

[0079] Optionally, to avoid test errors caused by improper length, the length range of the exposed insulating layer 35 is 1700 - 2300 mm. Correspondingly, the length range of the copper tape layer is 70 - 130 mm. Further, to facilitate more accurate detection of quality defects of the insulating layer 35, the copper tape layer is located in the middle of the insulating layer 35. Optionally, the insulating layer 35 is 2000 mm long and the copper tape layer is 100 mm long.

[0080] In some embodiments, in step S200, that is, the step of placing the exposed insulating layer 35 in the insulating box 100 to make the insulating layer 35 in an insulating state specifically includes: injecting an inert gas into the insulating box 100 to make the insulating layer 35 in an insulating state.

[0081] It is easy to understand that inert gases have stable chemical properties and are not easily conductive. Based on this, on the one hand, inert gases can effectively reduce the influence of moisture and oxygen in the air on the insulating layer 35, and on the other hand, they can provide a uniform electric field distribution and provide a highly sealed and controlled test environment. Additionally, in other embodiments, deionized water can also be injected into the insulating box 100 to submerge the soft joint semi-finished product, thereby making the insulating layer 35 in an insulating state.

[0082] Furthermore, in step S200, that is, the step of placing the exposed insulating layer 35 in the insulating box 100 to make the insulating layer 35 in an insulating state includes: placing the soft joint semi-finished product on the lifting platform 120 of the insulating box 100. It is easy to understand that through the design of the lifting platform 120, the height position of the exposed insulating layer 35 in the insulating box 100 can be changed, so as to adapt to high-voltage terminals 400 of different heights. Optionally, the lifting platform is lifted by a hand-cranked elevator 130.

[0083] Correspondingly, in step S500, that is, the step of connecting the copper tape layer to the high-voltage terminal 400 through the clamping ring and applying a voltage to the copper tape layer through the high-voltage terminal 400 further includes: adjusting the lifting platform 120 to move upward to connect the clamping ring to the copper tape layer. It is easy to understand that by adjusting the lifting platform 120 to move upward, the clamping ring can be stably connected to the copper tape layer on the insulating layer 35, avoiding connection failures or poor contacts caused by height deviations.

[0084] Furthermore, in step S500, the step of connecting the copper tape layer to the high-voltage terminal 400 through the clamping ring and applying a voltage to the copper tape layer through the high-voltage terminal 400 further includes: grounding both ends of the high-voltage terminal 400 and the soft joint semi-finished product. It is easy to understand that grounding can prevent leakage during the test and ensure the safety and reliability of the test.

[0085] Please refer to Figure 3 , in step S400, that is, the step of adjusting the temperature adjustment element 310 and the pressure adjustment element 330 to make the temperature and pressure in the insulating box 100 be at the temperature target value and the pressure target value respectively specifically includes:

[0086] Step S410, detecting whether the temperature in the insulating box 100 is within the target temperature range through the thermometer 210.

[0087] In step S410, the thermometer 210 can detect the temperature change inside the insulation box 100 to avoid irreversible damage caused by abnormal laboratory temperature. Optionally, when the target temperature is 70°C, the target temperature range is 70 ± 0.5°C.

[0088] Step S420, if the temperature is not within the target temperature range, temperature compensation is achieved through the temperature adjustment element 310 so that the temperature inside the insulation box 100 is within the target temperature range.

[0089] In step S430, the temperature adjustment element 310 can be communicatively connected to the thermometer 210 and automatically respond to the thermometer 210, thereby adjusting the temperature back within the target temperature range.

[0090] Correspondingly, that is, the steps of adjusting the temperature adjustment element 310 and the air pressure adjustment element 330 so that the temperature and pressure inside the insulation box 100 are respectively at the temperature target value and the pressure target value specifically further include:

[0091] Step S430, use the barometer 230 to detect whether the air pressure inside the insulation box 100 is within the target pressure range.

[0092] In step S430, the barometer 230 can detect the air pressure change inside the insulation box 100 to avoid irreversible damage caused by abnormal laboratory air pressure. Optionally, when the target air pressure is 0.05 MPa, the target temperature range is 0.05 ± 0.01 MPa.

[0093] Step S440, if the air pressure is not within the target pressure range, air pressure compensation is achieved through the air pressure adjustment element 330 so that the air pressure inside the insulation box 100 is within the target pressure range.

[0094] In step S440, the air pressure adjustment element 330 can be communicatively connected to the barometer 230 and automatically respond to the barometer 230, thereby adjusting the air pressure back within the target air pressure range.

[0095] It should be noted that the order between steps S410 - S420 and steps S430 - S440 can be interchanged. That is, in some embodiments, steps S410 - S420 can be executed first, and then steps S430 - S440; in other embodiments, steps S430 - S440 can be executed first, and then steps S410 - S420. The present application does not make specific limitations.

[0096] In addition, as mentioned above, the temperature and air pressure inside the insulating box 100 are interrelated. After steps S410 - S420 are completed, S430 can be executed independently to ensure that the air pressure inside the insulating box 100 is within the target pressure range corresponding to the target temperature range. Correspondingly, after steps S430 - S440 are completed, S410 can be executed independently to ensure that the temperature inside the insulating box 100 is within the target temperature range corresponding to the target pressure range.

[0097] It should also be noted that the adjustment range of the air pressure adjustment element 330 provided in this application is 0 - 0.1 MPa, and the adjustment range of the temperature adjustment element 310 is 0 - 100 °C. If the air pressure / temperature inside the insulating box 100 exceeds this range, the alarm on it will sound an alarm to remind the staff to stop the test.

[0098] In summary, the present invention provides a test method for high - voltage submarine cable joints. This test method can test the semi - finished soft joints. By observing whether there are defects on the exposed insulating layer 35 after the test, it can be determined whether the semi - finished soft joints are qualified and whether they can be further manufactured into finished products. If the semi - finished soft joints in this application are unqualified, this application only needs to remanufacture the semi - finished soft joints. Compared with the cumbersome operation of stripping all structures in the traditional method, the solution of this application can detect defects in the insulating layer 35 in advance, avoid rework in subsequent restoration work, greatly save rework time, and improve test efficiency.

[0099] Please refer to Figure 4 , the present invention also provides a test device 10 for high - voltage submarine cable joints, which applies the test method for high - voltage submarine cable joints in the foregoing embodiments. Therefore, it can also complete the test simply and at low cost, and can improve test efficiency.

[0100] This test device 10 specifically includes an insulating box 100, a temperature adjustment element 310, an air pressure adjustment element 330, and a pressurizing element. Among them, the temperature adjustment element 310 is connected to the insulating box 100 and is used to adjust the internal cavity temperature of the insulating box 100 to make it within the target temperature range; the air pressure adjustment element 330 is connected to the insulating box 100 and is used to adjust the internal cavity air pressure of the insulating box 100 to make it within the target pressure range; the pressurizing element includes a high - voltage terminal 400 and a clamping ring located inside the insulating box 100. The high - voltage terminal 400 is connected to the clamping ring to apply voltage to the copper tape layer and achieve reliable mechanical connection.

[0101] In addition, the test device further includes the lifting platform 120, transformer, pressure gauge 230, thermometer 210, etc. in the foregoing embodiments. In addition, to ensure the sealing performance of the insulating box 100, a sealing ring is provided at the hole where the insulating box 100 is connected to external devices (such as semi-finished flexible joints). To facilitate the operator to move it to a safe test location, universal wheels 110 are provided at the bottom of the insulating box 100.

[0102] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for testing a high-voltage submarine cable joint, characterized in that: include: The high-voltage submarine cable is processed to form a semi-finished soft joint with the insulation layer exposed; Placing the exposed insulating layer in an insulating box so that the insulating layer is in an insulating state; Winding a copper tape around the outer periphery of the insulating layer so that a copper tape layer is formed on the outer periphery of the insulating layer; Adjusting the temperature regulating element and the air pressure regulating element so that the temperature and the air pressure in the insulating box are within the target temperature range and the target pressure range respectively; The copper strip layer is connected to a high voltage terminal through a buckling ring, and a voltage is applied to the copper strip layer through the high voltage terminal; The state of the insulating layer was observed.

2. The method for testing a high-voltage submarine cable joint according to claim 1, characterized in that: The steps of adjusting the temperature regulating element and the air pressure regulating element so that the temperature and the pressure in the insulating box are respectively at the temperature target value and the pressure target value include: Detecting by a thermometer whether the temperature inside the insulating box is within a target temperature range; If the temperature is not within the target temperature range, temperature compensation is achieved through a temperature adjustment element to make the temperature inside the insulation box within the target temperature range.

3. The method for testing a high-voltage submarine cable joint according to claim 2, characterized in that: The steps of adjusting the temperature regulating element and the air pressure regulating element so that the temperature and the pressure in the insulating box are respectively at the temperature target value and the pressure target value include: Using a barometer to detect whether the air pressure in the insulating box is within a target pressure range; If the air pressure is not within the target pressure range, air pressure compensation is achieved through an air pressure regulating element to make the air pressure in the insulating box within the target pressure range.

4. The method for testing a high-voltage submarine cable joint according to claim 1, characterized in that: The step of placing the exposed insulating layer in an insulating box so that the insulating layer is in an insulating state comprises: The semi-finished flexible joint is placed on the lifting platform of the insulating box.

5. The method for testing a high-voltage submarine cable joint according to claim 4, characterized in that: The step of connecting the copper strip layer to the high voltage terminal through the buckling ring and applying voltage to the copper strip layer through the high voltage terminal also includes: The lifting platform is adjusted to move upward so that the buckling ring is connected to the copper belt layer.

6. The method for testing a high-voltage submarine cable joint according to any one of claims 1 to 5, characterized in that: The step of placing the exposed insulating layer in an insulating box so that the insulating layer is in an insulating state specifically includes: Inert gas is injected into the insulating box to keep the insulating layer in an insulating state.

7. The method for testing a high-voltage submarine cable joint according to any one of claims 1 to 5, characterized in that: The exposed insulating layer has a length ranging from 1700 to 2300 mm, and the copper tape layer is located in the middle of the insulating layer, with a length ranging from 70 to 130 mm.

8. The method for testing a high-voltage submarine cable joint according to any one of claims 1 to 5, characterized in that: The step of connecting the copper strip layer to the high voltage terminal through the buckling ring and applying voltage to the copper strip layer through the high voltage terminal also includes: The high voltage terminal and both ends of the flexible joint semi-finished product are grounded.

9. The method for testing a high-voltage submarine cable joint according to any one of claims 1 to 5, characterized in that: The step of processing the high-voltage submarine cable to form a semi-finished flexible joint with the insulation layer of the high-voltage submarine cable exposed comprises: Strip the ends of the two sections of high-voltage submarine cables to be connected so that the conductor core is exposed; Welding the two conductor cores together by welding; The inner shielding layer is longitudinally wrapped around the outer periphery of the conductor core and heated and melted to form; The insulating layer is evenly wound around the outer circumference of the inner shielding layer and heated and melted to form a shape.

10. A test device for a high-voltage submarine cable joint, using the test device for a high-voltage submarine cable joint as claimed in any one of claims 1 to 9, characterized in that: include: Insulation box; A temperature regulating element, the temperature regulating element is connected to the insulating box and is used to regulate the inner cavity temperature of the insulating box; An air pressure regulating element, the air pressure regulating element is connected to the insulating box and is used to regulate the air pressure in the inner cavity of the insulating box; A pressurizing element includes a high-voltage terminal and a buckling ring located in the insulating box, and the high-voltage terminal is connected to the buckling ring.

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