Fusing protection type large power transmission assembly and installation method thereof

Abstract

The invention discloses an underwater power transmission assembly, and aims to provide a fusing protection type large power transmission assembly which is convenient to install, good in practical effect and capable of achieving automatic fusing overload protection of a power transmission link under the condition of excess current-carrying or voltage-carrying transmission and preventing the transmission link from being damaged due to overload and an installation method of the fusing protection type large power transmission assembly. According to the technical scheme, the transmission assembly is of an integrated structure, the transmission assembly can achieve the two functions of circuit transmission and overload protection, a multi-layer sealing structure is formed on the transmission assembly, the stability of power transmission is guaranteed, meanwhile, the transmission assembly can adapt to the underwater high-pressure environment, and the service life of the transmission assembly is prolonged. According to the underwater transmission assembly, the self-recovery fuse is arranged in the contact piece, so that the transmission assembly can realize an automatic fusing mechanism and perform power failure under the condition of excess current or excess voltage of an outgoing line, thereby ensuring the physical integrity of the whole transmission line, and the underwater transmission assembly is suitable for the technical field of underwater transmission assemblies.

Description

Technical Field

[0001] The present invention relates to an underwater power transmission component, and more particularly, to a fuse-protected large power transmission component and an installation method thereof. Background Art

[0002] Current optoelectronic interconnection underwater transmission components are mainly composed of optoelectronic composite watertight cables combined with optoelectronic watertight connectors to form link components with optoelectronic signal and power transmission. The power transmission part usually uses copper alloy conductors to achieve electrical load and transmission. The transmitted power is directly related to the conductor cross-sectional area, insulation sheath material, etc., which determines the upper limit of the transmission link's load flow and withstand voltage.

[0003] At present, conventional transmission components on the market will suffer obvious thermal accumulation ablation damage or electrical breakdown damage under excessive use of overcurrent or overvoltage, which are irreversible damages to the connected transmission equipment. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a fuse-protected large power transmission component and its installation method that are easy to install, have good practical effects, and can realize automatic fuse overload protection of the power transmission link under excessive current or voltage transmission conditions to prevent the transmission link from being overloaded and damaged.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a fuse-protected large-power transmission component, comprising a plug connector, a transmission component being provided in the plug connector, the transmission component comprising an installation cavity provided in the plug connector, a sealing block provided in the installation cavity, and a through hole provided in the sealing block, a connecting groove being provided between the plug connector and the installation cavity, a threaded groove being provided in the connecting groove, a packaging component being further provided at one end of the plug connector away from the connecting groove, and a contact member and a transmission cable being provided in the through hole.

[0006] The present invention is further configured as follows: the contact piece includes a front conductor and a rear conductor, the front conductor and the rear conductor are connected by a support sleeve and a fuse, a socket is provided at the top of the front conductor, a cable channel is provided in the rear conductor, and the cable channel is used to lead out the transmission cable from the contact piece.

[0007] Preferably, the fuse has a front conductive part fixedly connected to the front conductor and a rear conductive part fixedly connected to the rear conductor, a resettable fuse is provided between the front conductive part and the rear conductive part, and the resettable fuse is configured to automatically cut off power after the circuit is over-transmitted.

[0008] Preferably, the resettable fuse includes a polymer resin electrically connected to the front conductive portion and the rear conductive portion, and a conductive filler disposed in the polymer resin.

[0009] The present invention is further configured as follows: a tail end seal is further provided at one end of the transmission component away from the connection groove, the tail end seal comprises a sealing plate arranged at the rear end of the transmission component, an opening is provided on the sealing plate, and a sealing gasket is provided in the opening.

[0010] The present application also provides a method for installing a fuse-protected large power transmission component, the method comprising the following steps: S1, installing a plug connector: fixing the plug connector on a processing table so that the central axis of the plug connector and the processing table are perpendicular to each other;

[0011] S2. Assemble the contact: Weld the resettable fuse between the front conductor and the rear conductor. After installation, install the insulating support sleeve between the front conductor and the rear conductor.

[0012] S3. Installing the contacts: inserting a sealing block into the mounting cavity of the plug connector, and inserting the assembled contacts into the through holes of the sealing block;

[0013] S4. Install the top plate: Install the top plate on the top of the sealing block so that the contact piece remains fixed in the through hole of the sealing block;

[0014] S5. Install the cable and the package: Insert the transmission cable into the rear end of the plug connector so that the end of the transmission cable is electrically connected to the rear conductive portion of the contact.

[0015] S6. After the transmission cable is installed, a sealing plate is installed at the rear end of the plug connector, and a packaging member is arranged outside the plug connector to form a sealing treatment for the sealing block.

[0016] Preferably, the installation method further includes a watertightness test method for the transmission component, comprising the following steps: S7, after the transmission component is installed, plugging the transmission component into contact with the conductor of the socket connector to form a plug-in assembly;

[0017] S8. Place the plug assembly in a test chamber, introduce a liquid simulating seawater composition into the test chamber, and inspect it according to the full-sea depth inspection specification;

[0018] S9. After the test is completed, the plug-in assembly is taken out to check whether there is liquid inside it. If so, it is determined that the watertight performance of the current transmission component is poor and the transmission component is unqualified. Otherwise, it is determined that the watertight performance of the current transmission component is good.

[0019] Preferably, the step S3 further includes detecting the use status of the contact, including the following steps: S31, installing the assembled contact on an adjustable constant current source, and testing the connectivity of the circuit. If the circuit is connected, it is determined that the resettable fuse in the current contact is connected and the contact operates normally, and the process jumps to S32 to continue testing. Otherwise, it is determined that the current resettable fuse is in a high-resistance state and the contact operates abnormally.

[0020] S32. Increase the current of the constant current source to I and continue for a period of time T. During the period of time T, detect the voltage across the contact. If the voltage across the contact fluctuates greatly, it is determined that the current resettable fuse is abnormal, stop testing, and notify the staff for maintenance. Otherwise, it is determined that the current resettable fuse is working normally, and jump to S33 to continue testing;

[0021] S33. Increase the current of the constant current source to 2I. At the same time, detect the temperature of the surface of the resettable fuse. The detected temperature value is D. If D is less than 120°C, it is determined that the current current has not caused the material in the resettable fuse to reach the phase transition point. Continue to increase the current intensity of the constant current source. Otherwise, it is determined that the current temperature in the resettable fuse has reached the phase transition temperature of the material in the resettable fuse. Jump to S34 to perform resistance detection.

[0022] S34, recording the initial resistance of the contact as R0, and detecting the resistance of the contact. If the detected resistance R ≥ 1000Ω, it is determined that the resistance of the current resettable fuse has increased, which can limit and protect the circuit. Otherwise, it is determined that the current resettable fuse is unqualified.

[0023] S35, disconnecting the current of the constant current source after the fuse is triggered, and allowing the resettable fuse to return to room temperature;

[0024] S36. After the resettable fuse returns to room temperature, the power is turned on again and the resistance of the contact is tested. If the resistance value R1 ≤ 1.5R0, it is determined that the current resettable fuse can be automatically restored and the current contact is operating normally. Otherwise, it is determined that the current contact is unqualified.

[0025] By adopting the above technical solution, the beneficial effects are as follows: 1. The transmission component of the present application has an integrated structure, so that the transmission component can realize the two functions of circuit transmission and overload protection. The transmission component has a sealing block, a packaging component and a tail end seal, and a multi-layer sealing structure is formed on the transmission component, which ensures the stability of power transmission while enabling the transmission component to adapt to the high-pressure environment underwater. In addition, by installing a contact between the socket interface and the transmission cable in the transmission component, and providing a self-resetting fuse in the contact, the transmission component can realize an automatic fusing mechanism and cut off the power when the outgoing line exceeds the current or voltage, thereby ensuring the physical integrity of the entire transmission line, reducing the degree of damage to the transmission link caused by the excess state, and reducing maintenance costs and losses. In addition, the self-resetting fuse can automatically return to a low-resistance state after the fault is eliminated, thereby completing the protection of the circuit. There is no need to manually replace the fuse, which has good practicality. In addition, the transmission component of the present application performs watertightness and usage status detection after installation to ensure the reliability of the operation of the transmission component.

[0026] 2. Furthermore, the present application provides an installation cavity in the plug connector and a connecting groove between the installation cavity and the plug connector, so that the socket part can be connected to the transmission component through the threaded groove in the connecting groove, and the contact piece includes a front conductive part and a rear conductive part, and the front conductive part and the rear conductive part are fixed by an insulating support sleeve, and the insulating support sleeve is made of insulating material to form a contact without a physical structure connection, so that the front conductive part and the rear conductive part can only be electrically connected through a self-resetting fuse to form a self-fusing contact piece. Specifically, in the above state, a physical connection path with excess protection is formed inside the large power transmission component. When the transmission power is too large and exceeds the rated power of the transmission component, the self-resetting fuse automatically melts, stops powering on, and performs power-off protection on the transmission line and the terminal equipment.

[0027] 3. At the same time, in order to achieve automatic power off and recovery of the transmission component of the present application, a resettable fuse is provided. The resettable fuse includes a polymer resin and a conductive filler disposed within the polymer resin. Specifically, under normal operation, the polymer resin tightly binds the conductive particles outside the crystalline structure to form a chain-like conductive path. At this time, the resettable fuse is in a low-resistance state. The heat energy generated by the current flowing through the resettable fuse on the line is small and does not change the crystal structure of the resettable fuse. When a short circuit or overload occurs in the line, the large current flowing through the resettable fuse generates heat that causes the polymer resin to melt, rapidly increasing in volume, forming a high-resistance state. , the working current decreases rapidly, thereby limiting and protecting the circuit. When the fault is eliminated, the resettable fuse cools down and crystallizes again, the volume shrinks, and the conductive particles re-form a conductive path. The resettable fuse returns to a low-resistance state, thereby completing the protection of the circuit without manual replacement. At the same time, as an optimization of the solution, during the operation of the resettable fuse, the circuit transmission status is further detected and protected by setting up terminal equipment on the coast. The use of the resettable fuse can avoid the huge cost of salvaging and repairing underwater transmission links, and can adjust the power and load energy consumption in time through the fuse state to ensure the normal operation of the system.

[0028] 4. In addition, during the installation of the transmission component of the present application, the three-layer sealing structure formed by the sealing block, the sealing gasket and the packaging component effectively blocks the invasion of external corrosive substances. After the installation is completed, the transmission component is subjected to a watertight test, and the pressure and temperature in the deep-sea environment are simulated to ensure that the transmission component meets the standards for deep-sea operation, discover potential sealing defects in advance, improve the product qualification rate, and enable it to adapt to the underwater environment. At the same time, after the contact parts are assembled, the use status of the contact parts is detected. Specifically, a simulated current test is performed on the contact parts to realize an overload simulation environment of the contact parts in the transmission component, so that the self-resetting fuse in the contact parts can be detected to prevent the self-resetting fuse from being unable to cut off the power or restore, thereby ensuring the normal operation of the contact parts.

[0029] 5. Furthermore, by testing the completed transmission components according to the full-sea depth inspection specifications, the inspection standard is 127MPa, the inspection time is 48 hours, and 200 extreme pressure shock cycle tests are carried out after the static water pressure test. This can effectively eliminate unqualified products, improve the product qualification rate, and prevent the problem of transmission component damage during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the specific structure of an embodiment of a fuse protection type large power transmission component and an installation method thereof according to the present invention;

[0031] Figure 2 A structural cross-sectional view of an embodiment of a fuse-protected large power transmission component and an installation method thereof according to the present invention;

[0032] Figure 3 A cross-sectional view of a contact member of an embodiment of a fuse-protected large power transmission component and an installation method thereof according to the present invention;

[0033] Figure 4 This is a flow chart of an installation method of a fuse protection type large power transmission component and an installation method thereof according to an embodiment of the present invention;

[0034] Figure 5 This is a flow chart of a watertightness testing method for a fuse-protected large power transmission component and an installation method thereof according to an embodiment of the present invention;

[0035] Figure 6 A flow chart of detecting the use status of contacts of an embodiment of a fuse protection type large power transmission component and an installation method thereof according to the present invention;

[0036] The figure is numeraled as follows: 1. plug connector; 11. transmission component; 12. mounting cavity; 13. sealing block; 14. through hole; 15. connection groove; 16. threaded groove; 17. package; 18. tail end seal; 181. sealing plate; 182. opening; 183. sealing gasket; 2. contact; 21. front conductor; 22. rear conductor; 23. support sleeve; 24. fuse; 241. front conductive part; 242. rear conductive part; 243. resettable fuse; 25. jack; 26. cable channel; 3. transmission cable. DETAILED DESCRIPTION

[0037] Reference Figures 1 to 6 The present invention further describes a fuse protection type large power transmission component and an installation method thereof.

[0038] For ease of explanation, spatial relative terms such as "upper", "lower", "left", and "right" are used in the embodiments to illustrate the relationship between one element or feature shown in the figures and another element or feature. It should be understood that, in addition to the orientation shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0039] Moreover, relational terms such as “first” and “second” are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any actual relationship or order between these components.

[0040] A fuse-protected high-power transmission component includes a plug connector 1, in which a transmission component 11 is provided. The transmission component 11 includes a mounting cavity 12 provided in the plug connector 1, a sealing block 13 provided in the mounting cavity 12, and a through hole 14 provided in the sealing block 13. The end of the plug connector 1 away from the connection groove 15 is also provided with a packaging member 17, and the through hole 14 is provided with a contact member 2 and a transmission cable 3.

[0041] The contact piece 2 includes a front conductor 21 and a rear conductor 22, which are connected by a support sleeve 23 and a fuse 24. A socket 25 is provided at the top of the front conductor 21, and a cable channel 26 is provided in the rear conductor 22. The cable channel 26 is used to lead out the transmission cable 3 from the contact piece 2.

[0042] Preferably, the fuse 24 has a front conductive portion 241 fixedly connected to the front conductor 21 and a rear conductive portion 242 fixedly connected to the rear conductor 22, and a resettable fuse 243 is provided between the front conductive portion 241 and the rear conductive portion 242. The resettable fuse 243 is configured to automatically cut off the power after the circuit is over-transmitted.

[0043] Preferably, the resettable fuse 243 includes a polymer resin electrically connected to the front conductive portion 241 and the rear conductive portion 242 and a conductive filler disposed in the polymer resin.

[0044] The transmission component 11 is further provided with a tail end seal 18 at one end away from the connection groove 15. The tail end seal 18 includes a sealing plate 181 provided at the rear end of the transmission component 11. The sealing plate 181 is provided with an opening 182, and a sealing gasket 183 is provided in the opening 182.

[0045] The present application also provides a method for installing a fuse-protected large power transmission component, the method comprising the following steps: S1, installing a plug connector: fixing the plug connector on a processing table so that the central axis of the plug connector and the processing table are perpendicular to each other;

[0046] S2. Assemble the contact: Weld the resettable fuse between the front conductor and the rear conductor. After installation, install the insulating support sleeve between the front conductor and the rear conductor.

[0047] S3. Installing the contacts: inserting a sealing block into the mounting cavity of the plug connector, and inserting the assembled contacts into the through holes of the sealing block;

[0048] S4. Install the top plate: Install the top plate on the top of the sealing block so that the contact piece remains fixed in the through hole of the sealing block;

[0049] S5. Install the cable and the package: Insert the transmission cable into the rear end of the plug connector so that the end of the transmission cable is electrically connected to the rear conductive portion of the contact.

[0050] S6. After the transmission cable is installed, a sealing plate is installed at the rear end of the plug connector, and a packaging member is arranged outside the plug connector to form a sealing treatment for the sealing block.

[0051] Preferably, the installation method further includes a watertightness test method for the transmission component, comprising the following steps: S7, after the transmission component is installed, plugging the transmission component into contact with the conductor of the socket connector to form a plug-in assembly;

[0052] S8. Place the plug assembly in a test chamber, introduce a liquid simulating seawater composition into the test chamber, and inspect it according to the full-sea depth inspection specification;

[0053] S9. After the test is completed, the plug-in assembly is taken out to check whether there is liquid inside it. If so, it is determined that the watertight performance of the current transmission component is poor and the transmission component is unqualified. Otherwise, it is determined that the watertight performance of the current transmission component is good.

[0054] Preferably, the step S3 further includes detecting the use status of the contact, including the following steps: S31, installing the assembled contact on an adjustable constant current source, and testing the connectivity of the circuit. If the circuit is connected, it is determined that the resettable fuse in the current contact is connected and the contact operates normally, and the process jumps to S32 to continue testing. Otherwise, it is determined that the current resettable fuse is in a high-resistance state and the contact operates abnormally.

[0055] S32. Increase the current of the constant current source to I and continue for a period of time T. During the period of time T, detect the voltage across the contact. If the voltage across the contact fluctuates greatly, it is determined that the current resettable fuse is abnormal, stop testing, and notify the staff for maintenance. Otherwise, it is determined that the current resettable fuse is working normally, and jump to S33 to continue testing;

[0056] S33. Increase the current of the constant current source to 2I. At the same time, detect the temperature of the surface of the resettable fuse. The detected temperature value is D. If D is less than 120°C, it is determined that the current current has not caused the material in the resettable fuse to reach the phase transition point. Continue to increase the current intensity of the constant current source. Otherwise, it is determined that the current temperature in the resettable fuse has reached the phase transition temperature of the material in the resettable fuse. Jump to S34 to perform resistance detection.

[0057] S34, recording the initial resistance of the contact as R0, and detecting the resistance of the contact. If the detected resistance R ≥ 1000Ω, it is determined that the resistance of the current resettable fuse has increased, which can limit and protect the circuit. Otherwise, it is determined that the current resettable fuse is unqualified.

[0058] S35, disconnecting the current of the constant current source after the fuse is triggered, and allowing the resettable fuse to return to room temperature;

[0059] S36. After the resettable fuse returns to room temperature, the power is turned on again and the resistance of the contact is tested. If the resistance value R1 ≤ 1.5R0, it is determined that the current resettable fuse can be automatically restored and the current contact is operating normally. Otherwise, it is determined that the current contact is unqualified.

[0060] The transmission component 11 of the present application has an integrated structure, so that the transmission component 11 can realize the two functions of circuit transmission and overload protection. The transmission component 11 has a sealing block 13, a packaging component 17 and a tail seal 18, forming a multi-layer sealing structure on the transmission component 11, which ensures the stability of power transmission while enabling the transmission component 11 to adapt to the high-pressure environment underwater. In addition, a contact 2 is installed between the socket interface and the transmission cable 3 in the transmission component 11, and a self-resetting fuse 243 is provided in the contact 2, so that The transmission component 11 can realize an automatic fusing mechanism and cut off the power when the outgoing line has excessive current or excessive voltage, thereby ensuring the physical integrity of the entire transmission line, reducing the degree of damage to the transmission link caused by the excessive state, and reducing maintenance costs and losses. In addition, the self-resetting fuse 243 can automatically return to a low-resistance state after the fault is eliminated, thereby completing the protection of the circuit. There is no need to manually replace the fuse 24, which has good practicality. In addition, the transmission component 11 of the present application performs watertightness and usage status detection after installation, ensuring the reliability of the operation of the transmission component 11.

[0061] Furthermore, the present application provides an installation cavity 12 in the plug connector 1 and a connecting groove 15 between the installation cavity 12 and the plug connector 1, so that the socket part can be connected to the transmission component 11 through the threaded groove 16 in the connecting groove 15, and the contact member 2 includes a front conductive part 241 and a rear conductive part 242, and the front conductive part 241 and the rear conductive part 242 are fixed by an insulating support sleeve 23, and the insulating support sleeve 23 is made of insulating material to form a non-physical structural connection contact, so that the front conductive part 241 and the rear conductive part 242 can only be electrically connected through the self-resetting fuse 243, forming a self-fusing contact member 2. Specifically, in the above state, a physical connection path with excess protection is formed inside the large power transmission component 11. When the transmission power is too large and exceeds the rated power of the transmission component 11, the self-resetting fuse 243 automatically melts, stops powering on, and performs power-off protection on the transmission line and the terminal equipment.

[0062] At the same time, in order to realize the automatic power off and recovery of the transmission component 11 of the present application, a resettable fuse 243 is provided. The resettable fuse 243 includes a polymer resin and a conductive filler provided in the polymer resin. Specifically, under normal operation, the polymer resin tightly binds the conductive particles outside the crystalline structure to form a chain-like conductive path. At this time, the resettable fuse 243 is in a low-resistance state. The heat energy generated by the current flowing through the resettable fuse 243 on the line is small and will not change the crystal structure of the resettable fuse 243. When a short circuit or overload occurs in the line, the large current flowing through the resettable fuse 243 generates heat that causes the polymer resin to melt, and the volume grows rapidly, forming a high When the self-resetting fuse 243 is in the resistance state, the working current decreases rapidly, thereby limiting and protecting the circuit. When the fault is eliminated, the self-resetting fuse 243 cools down and crystallizes again, the volume shrinks, and the conductive particles re-form a conductive path. The self-resetting fuse 243 returns to the low-resistance state, thereby completing the protection of the circuit without manual replacement. At the same time, as an optimization of the solution, during the operation of the self-resetting fuse 243, the circuit transmission status is further detected and protected by setting terminal equipment on the coast. The use of the self-resetting fuse 243 can avoid the huge cost of salvaging and repairing the underwater transmission link, and can adjust the power and load energy consumption in time according to the fuse state to ensure the normal operation of the system.

[0063] Moreover, during the installation of the transmission component 11 of the present application, the three-layer sealing structure formed by the sealing block 13, the sealing gasket 183 and the packaging component 17 effectively blocks the invasion of external corrosive substances. After the installation is completed, the transmission component 11 is subjected to a watertight test, and the pressure and temperature in the deep-sea environment are simulated to ensure that the transmission component 11 meets the standards for deep-sea operation, discover potential sealing defects in advance, improve the product qualification rate, and enable it to adapt to the underwater environment. At the same time, after the assembly of the contact 2 is completed, the use status of the contact 2 is detected. Specifically, a simulated current test is performed on the contact 2 to realize an overload simulation environment of the contact 2 in the transmission component 11, so that the self-resetting fuse 243 in the contact 2 can be detected to prevent the self-resetting fuse 243 from being unable to cut off the power or restore, thereby ensuring the normal operation of the contact 2.

[0064] Furthermore, by testing the completed transmission components according to the full-sea depth inspection specifications, the inspection standard is 127MPa, the inspection time is 48 hours, and 200 extreme pressure shock cycle tests are carried out after the static water pressure test. This can effectively eliminate unqualified products, improve the product qualification rate, and prevent the problem of transmission component damage during use.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A fuse protection type large power transmission component, characterized in that: The invention comprises a plug connector (1), wherein a transmission component (11) is provided in the plug connector (1), wherein the transmission component (11) comprises a mounting cavity (12) provided in the plug connector (1), a sealing block (13) provided in the mounting cavity (12), and a through hole (14) provided in the sealing block (13); a connecting groove (15) is provided between the plug connector (1) and the mounting cavity (12); a threaded groove (16) is provided in the connecting groove (15); a packaging component (17) is further provided at one end of the plug connector (1) away from the connecting groove (15); and a contact component (2) and a transmission cable (3) are provided in the through hole (14).

2. A fuse protection type large power transmission component according to claim 1, characterized in that: The contact piece (2) comprises a front conductor (21) and a rear conductor (22), wherein the front conductor (21) and the rear conductor (22) are connected via a support sleeve (23) and a fuse (24), a socket (25) is provided at the top end of the front conductor (21), and a cable channel (26) is provided in the rear conductor (22), wherein the cable channel (26) is used to lead out a transmission cable (3) from the contact piece (2).

3. A fuse protection type large power transmission component according to claim 2, characterized in that: The fuse (24) comprises a front conductive portion (241) fixedly connected to the front conductor (21) and a rear conductive portion (242) fixedly connected to the rear conductor (22); a resettable fuse (243) is provided between the front conductive portion (241) and the rear conductive portion (242); and the resettable fuse (243) is configured to automatically cut off power after excessive circuit transmission.

4. A fuse protection type large power transmission component according to claim 2, characterized in that: The resettable fuse (243) comprises a polymer resin electrically connected to the front conductive portion (241) and the rear conductive portion (242), and a conductive filler disposed in the polymer resin.

5. A fuse protection type large power transmission component according to claim 1, characterized in that: The transmission component (11) is further provided with a tail end seal (18) at one end away from the connection groove (15). The tail end seal (18) comprises a sealing plate (181) arranged at the rear end of the transmission component (11). The sealing plate (181) is provided with an opening (182), and a sealing gasket (183) is provided in the opening (182).

6. A method for installing a fuse-protected large power transmission component according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Install the plug connector: Fix the plug connector on the processing table so that the central axis of the plug connector is perpendicular to the processing table; S2. Assemble the contact: Weld the resettable fuse between the front conductor and the rear conductor. After installation, install the insulating support sleeve between the front conductor and the rear conductor. S3. Installing the contacts: inserting a sealing block into the mounting cavity of the plug connector, and inserting the assembled contacts into the through holes of the sealing block; S4. Install the top plate: Install the top plate on the top of the sealing block so that the contact piece remains fixed in the through hole of the sealing block; S5. Install the cable and the package: Insert the transmission cable into the rear end of the plug connector so that the end of the transmission cable is electrically connected to the rear conductive portion of the contact. S6. After the transmission cable is installed, a sealing plate is installed at the rear end of the plug connector, and a packaging member is arranged outside the plug connector to form a sealing treatment for the sealing block.

7. The method for installing a fuse-protected large power transmission component according to claim 6, characterized in that: Also included is a watertightness test method for a transmission assembly, comprising the following steps: S7, after the transmission assembly is installed, plugging the transmission assembly into contact with a conductor of a socket connector to form a plug-in assembly; S8. Place the plug assembly in a test chamber, introduce a liquid simulating seawater composition into the test chamber, and inspect it according to the full-sea depth inspection specification; S9. After the test is completed, the plug-in assembly is taken out to check whether there is liquid inside it. If so, it is determined that the watertight performance of the current transmission component is poor and the transmission component is unqualified. Otherwise, it is determined that the watertight performance of the current transmission component is good.

8. The method for installing a fuse-protected large power transmission component according to claim 6, characterized in that: The step S3 further includes detecting the use status of the contact, including the following steps: S31. Install the assembled contactor on an adjustable constant current source and test the circuit connectivity. If the circuit is connected, it is determined that the resettable fuse in the current contactor is connected and the contactor is operating normally. Jump to S32 to continue testing. Otherwise, it is determined that the current resettable fuse is in a high-resistance state and the contactor is operating abnormally. S32. Increase the current of the constant current source to I and continue for a period of time T. During the period of time T, detect the voltage across the contact. If the voltage across the contact fluctuates greatly, it is determined that the current resettable fuse is abnormal, stop testing, and notify the staff for maintenance. Otherwise, it is determined that the current resettable fuse is working normally, and jump to S33 to continue testing; S33. Increase the current of the constant current source to 2I. At the same time, detect the temperature of the surface of the resettable fuse. The detected temperature value is D. If D is less than 120°C, it is determined that the current current has not caused the material in the resettable fuse to reach the phase transition point. Continue to increase the current intensity of the constant current source. Otherwise, it is determined that the current temperature in the resettable fuse has reached the phase transition temperature of the material in the resettable fuse. Jump to S34 to perform resistance detection. S34, recording the initial resistance of the contact as R0, and detecting the resistance of the contact. If the detected resistance R ≥ 1000Ω, it is determined that the resistance of the current resettable fuse has increased, which can limit and protect the circuit. Otherwise, it is determined that the current resettable fuse is unqualified. S35, disconnecting the current of the constant current source after the fuse is triggered, and allowing the resettable fuse to return to room temperature; S36. After the resettable fuse returns to room temperature, the power is turned on again and the resistance of the contact is tested. If the resistance value R1 ≤ 1.5R0, it is determined that the current resettable fuse can be automatically restored and the current contact is operating normally. Otherwise, it is determined that the current contact is unqualified.

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