A switching system and method for replacing a high-voltage cable sheath protector without power outage

Abstract

The present invention relates to the technical field of sheath protectors, and more particularly to a switching system and method for replacing high-voltage cable sheath protectors without power outages. When a high-voltage cable sheath protector equipped with a switching device has insulation hazards, it can be replaced and tested without power outages, thereby avoiding power sales losses caused by applying for cable power outages and improving the production efficiency of the power supply company. Since the switching device has a remote electric control function, when replacing and testing the protector, the danger of opening the box cover and contacting the floating voltage is avoided, thereby improving the safety of power transmission and transformation status inspection, operation and maintenance, and test personnel. The remote electric control mechanism uses solenoid valve technology with a longer life, thereby avoiding the high failure rate of traditional mechanical transmission, improving the stability of the switching device, and also saving the physical strength of on-site staff and improving the work efficiency of on-site staff.

Description

Technical Field

[0001] The present invention relates to the technical field of sheath protectors, and in particular to a switching system and method for replacing a sheath protector of a high-voltage cable without power outage. Background Art

[0002] 35kV large-section power cables and power cables with voltage levels of 66kV, 110kV and above are all single-core cables. The three-phase interconnection and grounding of one end of the cable metal sheath are connected, and the other end is not grounded. When lightning waves or internal overvoltage flow along the cable core, a high impulse overvoltage will appear at the ungrounded end of the cable metal sheath, or when the system short-circuit fault current flows through the cable core, a high power frequency induced overvoltage will also appear at the ungrounded end of the sheath. The above overvoltage may break down the insulation of the cable outer sheath, causing multi-point grounding faults in the cable metal sheath, seriously affecting the normal operation of the power cable and even greatly reducing the service life of the cable. Therefore, according to the provisions of the power industry standard DL / T401-2002 "Guidelines for the Selection of High-voltage Power Cables", a cable sheath protector must be used to limit the induced voltage and fault overvoltage on the metal sheath (or metal sheath) of the power cable.

[0003] Usually, in order to limit the induced voltage and fault overvoltage on the metal sheath of the power cable and avoid the formation of circulating current in the sheath, one end of the cable sheath is directly grounded, and the other end must be grounded through a protector. If the line is long, the cable sheath can be divided into three sections (or multiples of three) and insulated from each other. The sheaths at the sections are cross-connected and grounded through a protector.

[0004] The cable sheath protector uses imported insulating materials as external insulation, with superior electrical performance and good sealing performance. Compared with traditional discharge gap protection, gapped silicon carbide resistor protection and other methods, its volt-ampere characteristics are more superior.

[0005] After the cable sheath protector is put into operation for one year, a preventive test should be carried out. The test items are as follows:

[0006] 1) DC 1mA voltage measurement: Apply DC voltage to both ends of the cable sheath protector. After the current flowing through the cable sheath protector stabilizes at 1mA, read the voltage value. This value must not be less than the specified DC reference voltage value.

[0007] 2) Insulation resistance test: Use a 2500 volt megohmmeter to test the insulation resistance of the protector. The insulation resistance value is not specified, but the results of each test should be close to each other, and there should be no short circuit, poor contact or short circuit.

[0008] In addition to the above power outage tests, there are also daily live inspections such as live testing of the cable sheath grounding current. Preventive tests and live inspections often find insulation degradation, breakdown short circuits and breakdown short circuits of cable sheath protectors. If such phenomena are found, it is necessary to apply for a cable power outage and replace it in the power outage state. This will bring the following difficulties:

[0009] 1: Power outages are difficult to prevent and result in huge losses in benefits.

[0010] Due to the large number of cables used in urban power grids, it is necessary to apply for a cable power outage when replacing the cable sheath protector during a power outage. After applying for a cable power outage, the power outage time will be increased, affecting the power sales efficiency of the power supply company. The abnormal power grid regulation of a cable will affect the normal power consumption of more than a thousand urban and rural residents.

[0011] 2: Increase safety risks for cable operation and maintenance personnel.

[0012] Power outage tests and live tests revealed that the sheath protector was damaged and needed to be replaced. Since the single-core cable is live, the sheath generates a high floating potential, some even reaching tens of thousands of volts. This poses a great safety hazard to manual inspection and repair. The current solution is to shut down the cable for replacement. Power outages not only result in a loss of electricity sales. Applying for power outages, power outage inspections, and power restoration takes a long time, which delays the normal planned work arrangements of maintenance personnel and invisibly increases the workload. Personnel have to go to the site many times, which increases the safety hazard of cable operation and maintenance personnel. Summary of the invention

[0013] The technical problem to be solved by the present invention is to provide a switching system and method for replacing a high-voltage cable sheath protector without power outage.

[0014] In order to solve the above technical problems, a technical solution adopted by the present invention is:

[0015] A switching system for replacing a high-voltage cable sheath protector without power outage comprises a switching device and a permanent grounding box, a temporary grounding box and a manual control box electrically connected to the switching device respectively;

[0016] The switching device includes two knife switch links, the output end of one of the two knife switch links is electrically connected to a permanent grounding box, and the output end of the other knife switch link is used to be electrically connected to a temporary grounding box before replacing the high-voltage cable sheath protector; the manual control box is used to control the switching between the two knife switch links.

[0017] Another technical solution adopted by the present invention is:

[0018] A switching method for replacing a high-voltage cable sheath protector without power outage comprises the following steps:

[0019] S1, judging whether the knife switch link electrically connected to the permanent grounding box in the two-way knife switch link of the switching device is in a closed state and whether the knife switch link electrically connected to the temporary grounding box in the two-way knife switch link is in a disconnected state;

[0020] S2. If both are true, connect the manual control box to the switching device and turn it on to control the switching between the two switch links;

[0021] S3, after connecting the temporary grounding box to the switching device, perform the operation of switching between the two switch links;

[0022] S4. After executing the operation of switching between the two knife switch links, the operation of replacing the high-voltage cable sheath protector is completed.

[0023] The beneficial effects of the present invention are:

[0024] The present invention provides a switching system and method for replacing a high-voltage cable sheath protector without power outage. When a high-voltage cable sheath protector equipped with a switching device has insulation hazards, it can be replaced and tested without power outage, thereby avoiding power sales losses caused by applying for cable power outages and improving the production efficiency of the power supply company. Since the switching device has a remote electric control function, the danger of opening the box cover and contacting the floating voltage is avoided when replacing and testing the protector, thereby improving the safety of the power transmission and transformation status inspection, operation and maintenance, and test personnel. The remote electric control mechanism uses solenoid valve technology with a longer life, which avoids the high failure rate of traditional mechanical transmission and improves the stability of the switching device. At the same time, it also saves the physical strength of on-site staff and improves the work efficiency of on-site staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a switching system for replacing a high-voltage cable sheath protector without power outage according to the present invention;

[0026] Figure 2 It is a structural schematic diagram of a switching device in a switching system for replacing a high-voltage cable sheath protector without power outage according to the present invention;

[0027] Figure 3 A flow chart of the steps of a switching method for replacing a high-voltage cable sheath protector without power outage according to the present invention;

[0028] Description of labels:

[0029] 1. Device input terminal; 2. First knife switch; 3. Second knife switch; 4. Device output terminal; 5. Device temporary grounding terminal; 6. First remote control mechanism; 7. First knife switch status display module; 8. Second remote control mechanism; 9. Second knife switch status display module;

[0030] 10. Switching device; 20. Permanent grounding box; 30. Temporary grounding box; 40. Manual control box. DETAILED DESCRIPTION

[0031] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0032] Please refer to Figures 1 to 3 The present invention provides a switching system for replacing a high-voltage cable sheath protector without power outage, comprising a switching device and a permanent grounding box, a temporary grounding box and a manual control box electrically connected to the switching device respectively;

[0033] The switching device includes two knife switch links, the output end of one of the two knife switch links is electrically connected to a permanent grounding box, and the output end of the other knife switch link is used to be electrically connected to a temporary grounding box before replacing the high-voltage cable sheath protector; the manual control box is used to control the switching between the two knife switch links.

[0034] From the above description, it can be seen that the beneficial effects of the present invention are:

[0035] The present invention provides a switching system for replacing high-voltage cable sheath protectors without power outages. When a high-voltage cable sheath protector equipped with a switching device has insulation hazards, it can be replaced and tested without power outages. This avoids power sales losses caused by applying for cable power outages, and improves the production efficiency of the power supply company. Since the switching device has a remote electric control function, the danger of opening the box cover and contacting the floating voltage is avoided when replacing and testing the protector, thereby improving the safety of power transmission and transformation status inspection, operation, and testing personnel. The remote electric control mechanism uses solenoid valve technology with a longer life, which avoids the high failure rate of traditional mechanical transmission and improves the stability of the switching device. It also saves the physical strength of on-site staff and improves the work efficiency of on-site staff.

[0036] Furthermore, the two-way knife switch link includes a first knife switch, a second knife switch, a first remote control mechanism and a second remote control mechanism; the switching device also includes a device input terminal, a device output terminal and a device temporary grounding terminal;

[0037] The input end of the first knife switch and the input end of the second knife switch are electrically connected to the input terminal of the device respectively; the output end of the first knife switch is electrically connected to the output terminal of the device and the output terminal of the device is electrically connected to the permanent grounding box; the output end of the second knife switch is electrically connected to the temporary grounding terminal of the device and is used to be electrically connected to the temporary grounding box before replacing the high-voltage cable sheath protector; the first knife switch is electrically connected to the first remote control mechanism, the second knife switch is electrically connected to the second remote control mechanism, and the first remote control mechanism and the second remote control mechanism are electrically connected to the manual control box respectively.

[0038] Furthermore, it also includes a first switch state display module and a second switch state display module;

[0039] The first knife switch status display module is electrically connected to the first knife switch; the second knife switch status display module is electrically connected to the second knife switch.

[0040] From the above description, it can be seen that through the above structural design, on-site staff can know the current equipment status through the status displayed by the first knife switch status display module and the second knife switch status display module, and execute whether to connect the manual control box according to the current equipment status.

[0041] Furthermore, the first remote control mechanism and the first knife switch status display module are electrically connected to the first knife switch through control cables, respectively; the second remote control mechanism and the second knife switch status display module are electrically connected to the second knife switch through control cables, respectively.

[0042] It can be seen from the above description that, through the above structural design, the switching device is provided with a remote electric control function.

[0043] Furthermore, the first remote control mechanism and the second remote control mechanism are electrically connected to the waterproof socket respectively through communication cables.

[0044] It can be seen from the above description that the communication function with the manual control box is realized through the above structural design.

[0045] Furthermore, the first remote control mechanism and the second remote control mechanism have the same structure;

[0046] The first remote control mechanism comprises a remote control power module, a motor rotation module, a remote control spring module and a remote control signal feedback module; the remote control power module provides analog power and digital power signals to the motor rotation module, the remote control spring module and the remote control signal feedback module respectively;

[0047] The motor rotation module is used to be electrically connected to the manual control box and drive the remote control spring module to close and open the spring energy storage knife switch; the remote control signal feedback module is electrically connected to the remote control spring module and is used to output a closing state signal and an opening state signal.

[0048] From the above description, it can be seen that through the above structural design, when the manual control box outputs a closing command, the motor rotation module rotates forward, drives the remote control spring module, and the spring energy storage knife switch is closed, and the remote control signal feedback module outputs a closing status signal; when the manual control box outputs an opening command, the motor rotation module rotates reversely, drives the remote control spring module, and the spring energy storage knife switch is disconnected, and the remote control signal feedback module outputs an opening status signal.

[0049] Furthermore, the external manual control box is electrically connected to the waterproof socket via a waterproof plug.

[0050] Furthermore, the manual control box includes a first remote control mechanism closing button, a first remote control mechanism opening button, a second remote control mechanism closing button, a second remote control mechanism opening button, a first knife switch opening and closing display module, and a second knife switch opening and closing display module;

[0051] The first remote control mechanism closing button, the first remote control mechanism opening button, the second remote control mechanism closing button and the second remote control mechanism opening button are electrically connected to the waterproof plug through a signal control line respectively;

[0052] The first knife switch opening and closing display module and the second knife switch opening and closing display module are electrically connected to the waterproof plug through signal display lines respectively.

[0053] It can be seen from the above description that, through the above structural design, manual operation can be implemented to execute corresponding functions.

[0054] Furthermore, the manual control box also includes a charging power supply, which is electrically connected to the first remote control mechanism closing button, the first remote control mechanism opening button, the second remote control mechanism closing button, the second remote control mechanism opening button, the first knife switch opening and closing display module and the second knife switch opening and closing display module respectively.

[0055] Furthermore, the output voltage of the charging power supply is DC 24V.

[0056] From the above description, it can be seen that through the above structural design, the charging power supply provides a DC 24V power supply voltage to each module of the manual control box for outdoor work, ensuring safe and reliable operation of outdoor work.

[0057] The present invention also provides a switching method for replacing a high-voltage cable sheath protector without power outage, comprising the following steps:

[0058] S1, judging whether the knife switch link electrically connected to the permanent grounding box in the two-way knife switch link of the switching device is in a closed state and whether the knife switch link electrically connected to the temporary grounding box in the two-way knife switch link is in a disconnected state;

[0059] S2. If both are true, connect the manual control box to the switching device and turn it on to control the switching between the two switch links;

[0060] S3, after connecting the temporary grounding box to the switching device, perform the operation of switching between the two switch links;

[0061] S4. After executing the operation of switching between the two knife switch links, the operation of replacing the high-voltage cable sheath protector is completed.

[0062] Furthermore, step S2 further includes:

[0063] After the manual control box is turned on, it is determined again whether the knife switch link in the two-way knife switch link of the switching device that is electrically connected to the permanent grounding box is in a closed state and whether the knife switch link in the two-way knife switch link that is electrically connected to the temporary grounding box is in a disconnected state. If both are true, enter step S3.

[0064] Furthermore, after step S4, the following steps are further included:

[0065] S5. After completing the operation of replacing the high-voltage cable sheath protector, the operation of switching between the two switch links is performed again;

[0066] S6. When the knife switch link in the two-way knife switch link of the switching device that is electrically connected to the permanent grounding box is in a closed state and the knife switch link in the two-way knife switch link that is electrically connected to the temporary grounding box is in a disconnected state, remove the temporary grounding box and the manual control box in turn.

[0067] Please refer to Figures 1 to 3 , Embodiment 1 of the present invention is:

[0068] like Figure 1 The present invention provides a switching system for replacing a high-voltage cable sheath protector without power outage, comprising a switching device 10 and a permanent grounding box 20, a temporary grounding box 30 and a manual control box 40 electrically connected to the switching device 10 respectively;

[0069] The switching device 10 includes two knife switch links, the output end of one of the two knife switch links is electrically connected to the permanent grounding box 20, and the output end of the other knife switch link is used to be electrically connected to the temporary grounding box 30 before replacing the high-voltage cable sheath protector; the manual control box 40 is used to control the switching between the two knife switch links.

[0070] like Figure 2 Specifically, the two-way knife switch link includes a first knife switch 2, a second knife switch 3, a first remote control mechanism 6, a second remote control mechanism 8, a first knife switch state display module 7, and a second knife switch state display module 9; the switching device also includes a device input terminal 1, a device output terminal 4, and a device temporary grounding terminal 5;

[0071] The input end of the first knife switch and the input end of the second knife switch are electrically connected to the input terminal of the device through a copper busbar; the output end of the first knife switch is electrically connected to the output terminal of the device through a copper busbar and the output terminal of the device is electrically connected to a permanent grounding box; the output end of the second knife switch is electrically connected to the temporary grounding terminal of the device and is used to be electrically connected to the temporary grounding box before replacing the high-voltage cable sheath protector; specifically, the output end of the second knife switch is exposed outside the switching device through the copper busbar, and can be connected to the temporary grounding box according to the actual situation on site.

[0072] The first knife switch is electrically connected to the first remote control mechanism, the second knife switch is electrically connected to the second remote control mechanism, the first remote control mechanism and the second remote control mechanism are electrically connected to the manual control box respectively. The first knife switch state display module is electrically connected to the first knife switch; the second knife switch state display module is electrically connected to the second knife switch.

[0073] Specifically, the first remote control mechanism and the first knife switch state display module are electrically connected to the internal structure of the first knife switch through control cables; the second remote control mechanism and the second knife switch state display module are electrically connected to the internal structure of the second knife switch through control cables. On-site staff can know the current device status through the status displayed by the first knife switch state display module and the second knife switch state display module, and decide whether to connect the manual control box according to the current device status.

[0074] The first remote control mechanism 6 and the second remote control mechanism 8 are electrically connected to the waterproof socket respectively. Specifically, the first remote control mechanism and the second remote control mechanism are electrically connected to the waterproof socket respectively through a communication cable to realize the communication function with the manual control box.

[0075] The first remote control mechanism and the second remote control mechanism have the same structure;

[0076] The first remote control mechanism comprises a remote control power module, a motor rotation module, a remote control spring module and a remote control signal feedback module; the remote control power module provides analog power and digital power signals to the motor rotation module, the remote control spring module and the remote control signal feedback module respectively;

[0077] The motor rotation module is used to be electrically connected to the manual control box and drive the remote control spring module to close and open the spring energy storage knife switch; the remote control signal feedback module is electrically connected to the remote control spring module and is used to output a closing state signal and an opening state signal.

[0078] The external manual control box is electrically connected to the waterproof socket through a waterproof plug. When the manual control box outputs a closing command, the motor rotation module rotates forward, drives the remote control spring module, and the spring energy storage knife switch is closed, and the remote control signal feedback module outputs a closing state signal; when the manual control box outputs an opening command, the motor rotation module rotates reversely, drives the remote control spring module, and the spring energy storage knife switch is disconnected, and the remote control signal feedback module outputs an opening state signal.

[0079] The manual control box includes a charging power supply, a first remote control mechanism closing button, a first remote control mechanism opening button, a second remote control mechanism closing button, a second remote control mechanism opening button, a first knife switch opening and closing display module, and a second knife switch opening and closing display module; the charging power supply is electrically connected to the first remote control mechanism closing button, the first remote control mechanism opening button, the second remote control mechanism closing button, the second remote control mechanism opening button, the first knife switch opening and closing display module, and the second knife switch opening and closing display module, respectively, and the output voltage of the charging power supply is DC 24V. The charging power supply provides a DC 24V power supply voltage to each module of the manual control box for outdoor work, ensuring safe and reliable operation of outdoor work.

[0080] The first remote control mechanism closing button, the first remote control mechanism opening button, the second remote control mechanism closing button and the second remote control mechanism opening button are electrically connected to the waterproof plug through a signal control line respectively;

[0081] The first knife switch opening and closing display module and the second knife switch opening and closing display module are electrically connected to the waterproof plug through signal display lines respectively.

[0082] like Figure 3 A switching method for replacing a high-voltage cable sheath protector without power outage of the present invention is as follows:

[0083] S1, judging whether the knife switch link electrically connected to the permanent grounding box in the two-way knife switch link of the switching device is in a closed state and whether the knife switch link electrically connected to the temporary grounding box in the two-way knife switch link is in a disconnected state;

[0084] S2. If both are yes, the manual control box is connected to the switching device and turned on to control the switching between the two knife switch links; after the manual control box is turned on, it is determined again whether the knife switch link electrically connected to the permanent grounding box in the two knife switch links of the switching device is in a closed state and whether the knife switch link electrically connected to the temporary grounding box in the two knife switch links is in a disconnected state. If both are yes, proceed to step S3.

[0085] S3, after connecting the temporary grounding box to the switching device, perform the operation of switching between the two switch links;

[0086] S4. After executing the operation of switching between the two knife switch links, the operation of replacing the high-voltage cable sheath protector is completed.

[0087] S5. After completing the operation of replacing the high-voltage cable sheath protector, the operation of switching between the two switch links is performed again;

[0088] S6. When the knife switch link in the two-way knife switch link of the switching device that is electrically connected to the permanent grounding box is in a closed state and the knife switch link in the two-way knife switch link that is electrically connected to the temporary grounding box is in a disconnected state, remove the temporary grounding box and the manual control box in turn.

[0089] Specifically:

[0090] In daily work, when the power transmission and transformation status inspection and maintenance personnel find that the cable sheath protector needs to be replaced, they need to follow the following steps:

[0091] 1. Observe the status of the first and second knife switches inside the switching device through the window. When the first knife switch shows a closed state and the second knife switch shows an open state, use the manual control box to connect the switching device.

[0092] 2. Turn on the manual control box, and confirm again that the first knife switch is in the closed state and the second knife switch is in the open state by observing the first knife switch opening and closing display module and the second knife switch opening and closing display module on the control box panel.

[0093] 3. Use a temporary grounding box to connect the temporary grounding terminal of the switching device through an insulated grounding cable.

[0094] 4. After pressing the closing button of the second remote control mechanism, press the opening button of the first remote control mechanism and observe the status of the first knife switch and the second knife switch respectively.

[0095] 5. When the first switch shows the open state and the second switch shows the closed state, open the permanent grounding box and replace the fault protector or perform a power outage test.

[0096] 6. After the work is completed, press the closing button of the first remote control mechanism, and then press the opening button of the second remote control mechanism to observe the status of the first knife switch and the second knife switch respectively.

[0097] 7. When the first switch shows closed state and the second switch shows open state, manually remove the temporary grounding box.

[0098] 8. After the whole process is correct, confirm the status of the first knife switch and the second knife switch again. When the first knife switch shows closed and the second knife switch shows open, remove the manual control box.

[0099] In summary, the present invention provides a switching system and method for replacing high-voltage cable sheath protectors without power outages. When a high-voltage cable sheath protector equipped with a switching device has insulation hazards, it can be replaced and tested without power outages, thereby avoiding power sales losses caused by applying for cable power outages and improving the production efficiency of the power supply company. Since the switching device has a remote electric control function, the danger of opening the box cover and contacting the floating voltage is avoided when replacing and testing the protector, thereby improving the safety of the power transmission and transformation status inspection, operation and maintenance, and test personnel. The remote electric control mechanism uses solenoid valve technology with a longer life, which avoids the high failure rate of traditional mechanical transmission and improves the stability of the switching device. At the same time, it also saves the physical strength of on-site staff and improves the work efficiency of on-site staff.

[0100] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A switching system for replacing high-voltage cable sheath protectors without power outages. It is characterized in that It includes a switching device and a permanent grounding box, a temporary grounding box and a manual control box which are electrically connected to the switching device respectively; The switching device comprises two knife switch links, wherein the output end of one of the two knife switch links is electrically connected to a permanent grounding box, and the output end of the other knife switch link is used to be electrically connected to a temporary grounding box before replacing the high-voltage cable sheath protector; the manual control box is used to control the switching between the two knife switch links; The two-way knife switch link includes a first knife switch, a second knife switch, a first remote control mechanism and a second remote control mechanism; the switching device also includes a device input wiring terminal, a device output wiring terminal and a device temporary grounding terminal; The input end of the first knife switch and the input end of the second knife switch are electrically connected to the input terminal of the device respectively; the output end of the first knife switch is electrically connected to the output terminal of the device, and the output terminal of the device is electrically connected to the permanent grounding box; the output end of the second knife switch is electrically connected to the temporary grounding terminal of the device and is used to be electrically connected to the temporary grounding box before replacing the high-voltage cable sheath protector; the first knife switch is electrically connected to the first remote control mechanism, the second knife switch is electrically connected to the second remote control mechanism, and the first remote control mechanism and the second remote control mechanism are electrically connected to the manual control box respectively; The first remote control mechanism and the second remote control mechanism have the same structure; The first remote control mechanism comprises a remote control power module, a motor rotation module, a remote control spring module and a remote control signal feedback module; the remote control power module provides analog power and digital power signals to the motor rotation module, the remote control spring module and the remote control signal feedback module respectively; The motor rotation module is used to be electrically connected to the manual control box and drive the remote control spring module to execute the closing and opening of the spring energy storage knife switch; the remote control signal feedback module is electrically connected to the remote control spring module, and is used to output a closing state signal and an opening state signal; The manual control box includes a first remote control mechanism closing button, a first remote control mechanism opening button, a second remote control mechanism closing button, a second remote control mechanism opening button, a first knife switch opening and closing display module, and a second knife switch opening and closing display module; The first remote control mechanism closing button, the first remote control mechanism opening button, the second remote control mechanism closing button and the second remote control mechanism opening button are electrically connected to the waterproof plug through a signal control line respectively; The first knife switch opening and closing display module and the second knife switch opening and closing display module are electrically connected to the waterproof plug through signal display lines respectively.

2. A switching system for replacing a high-voltage cable sheath protector without power outage according to claim 1, It is characterized in that It also includes a first switch status display module and a second switch status display module; The first knife switch status display module is electrically connected to the first knife switch; the second knife switch status display module is electrically connected to the second knife switch.

3. A switching system for replacing a high-voltage cable sheath protector without power outage according to claim 2, It is characterized in that The first remote control mechanism and the first knife switch status display module are electrically connected to the first knife switch through control cables, respectively; the second remote control mechanism and the second knife switch status display module are electrically connected to the second knife switch through control cables, respectively.

4. A switching system for replacing a high-voltage cable sheath protector without power outage according to claim 1, It is characterized in that The manual control box also includes a charging power supply, which is electrically connected to the first remote control mechanism closing button, the first remote control mechanism opening button, the second remote control mechanism closing button, the second remote control mechanism opening button, the first knife switch opening and closing display module and the second knife switch opening and closing display module respectively.

5. A switching method for a switching system for replacing a high-voltage cable sheath protector without power outage according to any one of claims 1 to 4, It is characterized in that The following steps are involved: S1, judging whether the knife switch link electrically connected to the permanent grounding box in the two-way knife switch link of the switching device is in a closed state and whether the knife switch link electrically connected to the temporary grounding box in the two-way knife switch link is in a disconnected state; S2. If both are true, connect the manual control box to the switching device and turn it on to control the switching between the two switch links; S3, after connecting the temporary grounding box to the switching device, perform the operation of switching between the two switch links; S4. After executing the operation of switching between the two knife switch links, the operation of replacing the high-voltage cable sheath protector is completed.

6. The switching method of a switching system for replacing a high-voltage cable sheath protector without power outage according to claim 5, It is characterized in that Step S2 also includes: After the manual control box is turned on, it is determined again whether the knife switch link in the two-way knife switch link of the switching device that is electrically connected to the permanent grounding box is in a closed state and whether the knife switch link in the two-way knife switch link that is electrically connected to the temporary grounding box is in a disconnected state. If both are true, enter step S3.

7. The switching method of a switching system for replacing a high-voltage cable sheath protector without power outage according to claim 5, It is characterized in that After step S4, the following steps are also included: S5. After completing the operation of replacing the high-voltage cable sheath protector, the operation of switching between the two switch links is performed again; S6. When the knife switch link in the two-way knife switch link of the switching device that is electrically connected to the permanent grounding box is in a closed state and the knife switch link in the two-way knife switch link that is electrically connected to the temporary grounding box is in a disconnected state, remove the temporary grounding box and the manual control box in turn.

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