Disconnection method and apparatus, electronic device, and storage medium

Abstract

The application discloses a disconnection method and device, electronic equipment and a storage medium, and the method comprises the following steps: in response to a replacement instruction, acquiring cable core loop information and protection type information of a main transformer protection screen to be disconnected, and acquiring on-site actual survey situation information and disconnection risk data; establishing a disconnection table according to the cable core loop information, the on-site actual survey situation information and the disconnection risk data; correcting the disconnection table according to a preset inspection standard to obtain a target disconnection table; and performing a disconnection operation corresponding to the protection type information based on the target disconnection table to install a new main transformer protection screen. The application is favorable to solving the technical problem that safety accidents often occur due to the lack of a confirmation process of a loop connection during secondary loop reconstruction, and improving the working efficiency of disconnection.

Description

Technical Field

[0001] This invention relates to the technical field of secondary circuit modification, and in particular to a method, apparatus, electronic device, and storage medium for disconnecting and reconnecting wires. Background Technology

[0002] In recent years, with the continuous innovation of various protection device technologies and the comprehensive application of automation, intelligence and digitalization technologies, in order to eliminate hidden dangers, prevent risks, improve power quality and power supply reliability, and ensure the safe and reliable operation of the power grid and equipment, the protection equipment in substations urgently needs to be upgraded and replaced, and the automation level of equipment needs to be improved. The transformation of secondary protection equipment has become a trend.

[0003] Modifying a single bay's equipment may affect the normal operation of the bay in operation. The 220kV main transformer protection system, in particular, involves a wide range and many operating bays; modifying the main transformer protection system while other bays are operating normally poses a high risk. Currently, construction personnel can only identify the cables to be disconnected according to industry standards using the secondary circuit safety measures sheet. After disconnecting the secondary circuit wiring, the old circuit cables are removed by wrapping them with insulating tape. This method is prone to incomplete disconnection or incorrect wiring, posing a potential hazard to the safe operation of secondary equipment.

[0004] When modifying secondary circuits, it is often found that equipment has undergone multiple circuit modifications at different times, resulting in disorganized drawings. On-site surveys and completion of secondary circuit safety measures forms are used to determine the relevant secondary circuits requiring disconnection and connection, along with construction plans. However, the lack of a process for reviewing and verifying circuit wiring and functions greatly increases the risk of omissions and errors, raising operational safety risks. Wiring errors during construction can easily lead to parasitic circuits, causing potential hazards such as malfunctions and DC grounding in substation equipment, posing risks to the safe operation of the power system. In particular, the protection of 220kV main transformers involves many operational bays, covers a wide range, and has a significant impact, necessitating specialized disconnection and connection tables to help construction personnel identify secondary circuits involving other bays, ensuring safe, efficient, and correct disconnection and connection work.

[0005] Therefore, in order to improve the efficiency of disconnection and reconnection work and solve the technical problem that the lack of a circuit wiring confirmation process during the current secondary circuit modification process can easily lead to safety accidents, it is urgent to develop a disconnection and reconnection method. Summary of the Invention

[0006] This invention provides a method, apparatus, electronic device, and storage medium for disconnecting wiring, which solves the technical problem that safety accidents often occur during secondary circuit modification due to the lack of a circuit wiring confirmation process.

[0007] In a first aspect, the present invention provides a method for disconnecting a wire, comprising:

[0008] In response to a replacement command, obtain information on the cable core circuit and protection type of the main transformer protection panel to be dismantled, as well as information on the actual on-site survey and dismantling risk data;

[0009] Based on the cable core circuit information, the actual on-site survey information, and the disconnection risk data, establish a disconnection connection table;

[0010] According to the preset inspection standards, the disconnection line table is calibrated to obtain the target disconnection line table;

[0011] Based on the target disconnection and reconnection table, perform the disconnection and reconnection operations corresponding to the protection type information to install a new main transformer protection panel.

[0012] Optionally, a disconnection / reconnection table is established based on the cable core circuit information, the actual on-site survey information, and the disconnection / reconnection risk data, including:

[0013] Based on the cable core circuit information, a preliminary disconnection table is generated;

[0014] Based on the actual on-site survey information and the order of disassembly followed by reassembly, the disassembly and reassembly sequence data in the preliminary disassembly and reassembly line table are sorted according to the level of disassembly and reassembly risk data to obtain the disassembly and reassembly line table.

[0015] Optionally, based on the target disconnection / removal table, disconnection / removal operations corresponding to the protection type information are performed to install a new main transformer protection panel, including:

[0016] Complete the security measures corresponding to the protection type information;

[0017] According to the protection type information and the disconnection wiring table, disconnect the circuit wiring corresponding to the main transformer protection panel to be removed, so as to remove the main transformer protection panel to be removed;

[0018] Based on the protection type information and the disconnection / removal wiring table, perform the corresponding wiring operations to install the new main transformer protection panel.

[0019] Optionally, based on the target disconnection and reconnection table, after performing the disconnection and reconnection operations corresponding to the protection type information to install the new main transformer protection panel, the process further includes:

[0020] Verify whether the new main transformer protection panel is operating normally.

[0021] Secondly, the present invention provides a disconnection / removal device, comprising:

[0022] The acquisition module is used to respond to the replacement command by acquiring the cable core circuit information and protection type information of the protection panel of the main transformer to be disassembled, as well as the actual on-site survey information and disassembly risk data.

[0023] A module is established to create a disconnection and reconnection table based on the cable core circuit information, the actual on-site survey information, and the disconnection and reconnection risk data.

[0024] The calibration module is used to calibrate the disconnection line table according to a preset inspection standard to obtain the target disconnection line table.

[0025] The installation module is used to perform disconnection and reconnection operations corresponding to the protection type information based on the target disconnection and reconnection table, so as to install a new main transformer protection panel.

[0026] Optionally, the establishment module includes:

[0027] A generation submodule is used to generate a preliminary disconnection table based on the cable core circuit information;

[0028] The sorting submodule is used to sort the disassembly and reassembly sequence data of the preliminary disassembly and reassembly line table according to the high and low levels of the disassembly and reassembly risk data, based on the actual on-site survey information and the disassembly-to-reassembly order standard, to obtain the disassembly and reassembly line table.

[0029] Optionally, the installation module includes:

[0030] The security submodule is used to implement the security measures corresponding to the protection type information;

[0031] The dismantling submodule is used to dismantle the circuit wiring corresponding to the main transformer protection panel to be dismantled, according to the protection type information and the dismantling wiring table, so as to remove the main transformer protection panel to be dismantled.

[0032] The installation submodule is used to perform corresponding wiring operations based on the protection type information and the disconnection / removal wiring table to install the new main transformer protection panel.

[0033] Optionally, the device further includes:

[0034] The verification module is used to verify whether the new main transformer protection panel is operating normally.

[0035] Thirdly, this application provides an electronic device including a processor and a memory, the memory storing computer-readable instructions that, when executed by the processor, perform the steps of the method provided in the first aspect above.

[0036] Fourthly, this application provides a storage medium having a computer program stored thereon, which, when executed by a processor, performs the steps of the method provided in the first aspect above.

[0037] As can be seen from the above technical solutions, the present invention has the following advantages: The present invention provides a disconnection and reconnection method, which, in response to a replacement command, obtains the cable core circuit information and protection type information of the main transformer protection panel to be dismantled, as well as the actual on-site survey information and disconnection and reconnection risk data. Based on the cable core circuit information, the actual on-site survey information, and the disconnection and reconnection risk data, a disconnection and reconnection table is established. According to a preset inspection standard, the disconnection and reconnection table is corrected to obtain a target disconnection and reconnection table. Based on the target disconnection and reconnection table, the disconnection and reconnection operations corresponding to the protection type information are performed to install a new main transformer protection panel. This disconnection and reconnection method solves the technical problem that the lack of a circuit wiring confirmation process during secondary circuit modification can easily lead to safety accidents, thus improving the efficiency of disconnection and reconnection work. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a flowchart illustrating the steps of a first embodiment of a disconnection method according to the present invention;

[0040] Figure 2 This is a flowchart illustrating the steps of a second embodiment of the disconnection method of the present invention;

[0041] Figure 3 This is a structural block diagram of the main transformer protection panel involving other bay-related circuits in a disconnection and connection method of the present invention;

[0042] Figure 4 This is a structural block diagram of the circuit connecting the main transformer protection to the DC system in a disconnection and connection method of the present invention;

[0043] Figure 5 This is a structural block diagram of the circuit connecting the main transformer protection and the bus tie protection panel in a disconnection and connection method of the present invention;

[0044] Figure 6 This is a structural block diagram of the circuit connecting the main transformer protection and the bus differential protection panel in a disconnection and connection method of the present invention;

[0045] Figure 7This is a structural block diagram of the circuit connecting the main transformer protection and the standby automatic transfer switch in a disconnection and connection method of the present invention.

[0046] Figure 8 This is a structural block diagram of the circuit of the main transformer protection and each PT parallel panel in a disconnection and connection method of the present invention;

[0047] Figure 9 This is a structural block diagram of an embodiment of the disconnection and reconnection device of the present invention. Detailed Implementation

[0048] This invention provides a method, apparatus, electronic device, and storage medium for disconnecting wiring, which addresses the technical problem that safety accidents frequently occur during secondary circuit modifications due to the lack of a circuit wiring verification process.

[0049] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0050] Example 1, please refer to Figure 1 , Figure 1 The flowchart of a method for disconnecting wires according to an embodiment of the present invention includes:

[0051] Step S101: In response to the replacement command, obtain the cable core circuit information and protection type information of the protection panel of the main transformer to be dismantled, as well as the actual on-site survey information and dismantling risk data.

[0052] Step S102: Establish a disconnection / reconnection table based on the cable core circuit information, the actual on-site survey information, and the disconnection / reconnection risk data;

[0053] In this embodiment of the invention, a preliminary disconnection and reconnection table is generated based on the cable core circuit information. Based on the actual on-site survey information and the order standard of disconnection before reconnection, the disconnection and reconnection sequence data in the preliminary disconnection and reconnection table are sorted according to the level of disconnection and reconnection risk data to obtain the disconnection and reconnection table.

[0054] Step S103: According to the preset inspection standard, calibrate the disconnection line table to obtain the target disconnection line table;

[0055] Step S104: Based on the target disconnection and reconnection table, perform the disconnection and reconnection operations corresponding to the protection type information to install a new main transformer protection panel.

[0056] In this embodiment of the invention, the safety measures corresponding to the protection type information are completed. According to the protection type information and the disconnection table, the circuit wiring corresponding to the main transformer protection panel to be removed is disconnected to remove the main transformer protection panel to be removed. Based on the protection type information and the disconnection table, the corresponding wiring operation is performed to install the new main transformer protection panel.

[0057] The disconnection and reconnection method provided in this embodiment of the invention, in response to a replacement command, acquires the cable core circuit information and protection type information of the main transformer protection panel to be dismantled, as well as the actual site survey information and disconnection and reconnection risk data. Based on the cable core circuit information, the actual site survey information, and the disconnection and reconnection risk data, a disconnection and reconnection table is established. The disconnection and reconnection table is corrected according to a preset inspection standard to obtain a target disconnection and reconnection table. Based on the target disconnection and reconnection table, disconnection and reconnection operations corresponding to the protection type information are performed to install a new main transformer protection panel. This disconnection and reconnection method solves the technical problem that the lack of a circuit wiring confirmation process during secondary circuit modification can easily lead to safety accidents, thus improving the work efficiency of disconnection and reconnection.

[0058] Example 2, please refer to Figure 2 , Figure 2 The flowchart of a disconnection method according to the present invention includes:

[0059] Step S201: In response to the replacement command, obtain the cable core circuit information and protection type information of the protection panel of the main transformer to be dismantled, as well as the actual on-site survey information and dismantling risk data.

[0060] In this embodiment of the invention, a site survey is required one week before the replacement of the protection panel to obtain information on the actual site survey and disassembly risk data. The transformer protection panel is usually a three-sided panel. Based on the wiring diagram after the modification, the two ends of each control cable core of the protection panel one, protection panel two, and protection panel three that need to be modified are sorted out one by one, and the protection type information and cable core circuit information of the main transformer protection panel are recorded one by one.

[0061] Step S202: Generate a preliminary disconnection table based on the cable core circuit information;

[0062] Step S203: Based on the actual on-site survey information and the order of disassembly followed by reassembly, sort the disassembly and reassembly sequence data in the preliminary disassembly and reassembly line table according to the level of disassembly and reassembly risk data to obtain the disassembly and reassembly line table.

[0063] In this embodiment of the invention, based on the actual on-site survey, the disconnection and reconnection sequence data of the preliminary disconnection and reconnection table are sorted according to the order of risk from high to low and the order of disconnection before reconnection, to obtain the disconnection and reconnection table.

[0064] Step S204: According to the preset inspection standard, calibrate the disconnection line table to obtain the target disconnection line table;

[0065] In this embodiment of the invention, the sorting disconnection line table is corrected according to the preset inspection standard to obtain the disconnection line table. The disconnection line table is classified and screened and affixed to the back of the protective screen, making the circuits of disconnection and connection in the relevant screen cabinets visible and more intuitive.

[0066] In the specific implementation, the data for establishing the final disconnect cable includes:

[0067] Cable parameters: control cable number, control cable start and end positions.

[0068] Terminal block number: Terminal block number at both ends of the control cable and terminal block number at both ends when the cable is removed.

[0069] Loop section: loop number, loop function, and whether it involves operating equipment.

[0070] Confirmation process: completion status, confirmation by the executor, confirmation by the guardian.

[0071] When modifying secondary circuits, use a disconnection and relocation table to ensure that disconnections are made correctly, without omissions, and without excess disconnections, leaving no parasitic circuits behind, thus ensuring the normal operation of the equipment.

[0072] Step S205: Complete the security measures corresponding to the protection type information;

[0073] In this embodiment of the invention, corresponding safety measures are implemented according to the protection type of the main transformer protection panel to be disassembled.

[0074] For a detailed implementation, please refer to Figure 3 , Figure 3This is a structural block diagram of the main transformer protection panel and its associated circuits in a disconnection and connection method according to the present invention. Specifically, 301 is the main transformer protection panel, 302 is the main transformer fault recording panel, 303 is the main transformer monitoring and control panel, 304 is the stability control main unit panel, 305 is the grounding transformer protection panel, 306 is the bus differential protection panel, 307 is the 10kV sectional protection panel, 308 is the 110kV bus tie protection panel, 309 is the 220kV bus tie protection panel, 310 is the control cabinet, 311 is the main transformer electricity meter panel, 312 is the 10kV PT parallel panel, 313 is the 110kV PT parallel panel, 314 is the DC feeder panel, 315 is the 10kV backup automatic transfer panel, 316 is the 110kV backup automatic transfer panel, and 317 is the 220kV PT parallel panel. When replacing the main transformer protection, attention must be paid to the impact of removing the old protection on other bays. In normal operation, the DC system provides DC power to relay protection equipment, automatic devices, circuit breaker tripping and closing operation circuits, and control circuits. When upgrading the main transformer protection or removing the old main transformer protection panel, the circuit breakers on all three sides of the main transformer are in the open state. The power supply air switches for the protection devices of each protection panel of the main transformer, the control power supply air switches for each side of the transformer protection, and the voltage switching power supply box are disconnected from the DC system at this time. This allows for the removal and connection of relevant secondary circuits in the main transformer protection panel and DC feeder panel.

[0075] Please see Figure 4 , Figure 4 This is a structural block diagram of the circuit connecting the main transformer protection and the DC system in a disconnection and connection method of the present invention. 301 is the main transformer protection panel, 314 is the DC feeder panel, 401 is the protection device power supply, 402 is the switch control power supply, and 403 is the voltage switching box power supply. When the protection type of the main transformer protection panel is DC system type, in the circuit connecting the main transformer protection and the DC system, 1) before disconnection and connection are performed on the main transformer protection panel: remove the high-voltage side failure start pressure plate, switch failure de-energization lockout pressure plate, three-trip start failure pressure plate, trip three-side bus tie switch pressure plate, lockout backup automatic transfer pressure plate, and failure main pressure plate, and seal the upper and lower ends of the above pressure plates with insulating tape. This ensures that the normal operation of the operating bay will not be affected by accidental contact during construction, ensuring safety and reliability during construction. 2) The following safety measures are performed on the DC panel: seal all terminals, air switches, and non-working equipment except for the secondary circuit terminals involving the main transformer protection that need to be removed. 3) Determine whether the DC circuit is related to the operating equipment. If the DC panel side is the secondary circuit power supply end, prioritize removing the cable cores at the power supply end.

[0076] Please see Figure 5 , Figure 5This is a block diagram of the circuit connecting the main transformer protection and the bus tie protection panel in a disconnection and connection method of the present invention. 301 is the main transformer protection panel, 308 is the 110kV bus tie protection panel, 309 is the 220kV bus tie protection panel, 501 is the main transformer protection tripping the 220kV bus tie switch, and 502 is the main transformer protection tripping the 110kV bus tie switch. During normal operation, when a system fault occurs, the transformer's backup protection (including impedance protection, composite voltage blocking directional overcurrent protection, zero-sequence directional overcurrent protection, etc.) trips as backup protection, disconnecting the bus tie sectionalizing switch to protect the normal operation of the non-faulty bus section and prevent further expansion of the fault range. When modifying the main transformer protection and removing the old main transformer protection panel, the main transformer is de-energized on all three sides, and the main transformer operating power supply is disconnected from the DC system. However, the bus tie protection operating power supply is not disconnected from the DC system. Special attention needs to be paid to the disconnection and connection of the circuit. Remove the pressure plate that trips the bus tie switch and seal the upper and lower ends of the pressure plate with insulating tape to ensure that the bus tie protection is not affected. At this point, the relevant secondary circuits of the main transformer protection panel and the bus tie protection panel are removed and connected.

[0077] When the protection type of the main transformer protection panel is the bus tie protection panel type, in the circuit connected to the main transformer protection and the bus tie protection panel, 1) before the main transformer protection panel completes the disconnection safety measures: remove the high-voltage side failure start pressure plate, switch failure unlocking and interlocking pressure plate, three-trip start failure pressure plate, trip three-side bus tie switch pressure plate, interlocking backup automatic transfer pressure plate, and failure main pressure plate, and seal the upper and lower ends of the above pressure plates with insulating tape. This ensures that the normal operation of the operating bay will not be affected by accidental contact during construction, ensuring safety and reliability during construction. 2) On the 220kV bus tie protection panel, complete the following safety measures: seal all terminals, pressure plates, air switches, and non-working equipment except for the secondary circuit terminals involving the main transformer protection that need to be removed. 3) On the 110kV bus tie protection panel, complete the following safety measures: seal all terminals, pressure plates, air switches, and non-working equipment except for the secondary circuit terminals involving the main transformer protection that need to be removed. 4) Determine whether the bus tie tripping circuit is related to the operating equipment. If the bus tie protection panel side is the secondary circuit power supply end, prioritize removing the cable cores at the power supply end.

[0078] Please see Figure 6 , Figure 6This is a block diagram of the circuit connecting the main transformer protection and the bus differential protection panel in a disconnection and connection method of the present invention. 301 is the main transformer protection panel, 601 is the 220kV bus differential protection panel, 602 is the 110kV bus differential protection panel, 603 is for releasing the voltage blocking in case of failure, 604 is for initiating high-voltage side failure, 605 is for the bus differential protection to trip the high-voltage side switch, 606 is for tripping all three sides of the switch in case of failure, and 607 is for the bus differential protection to trip the medium-voltage side switch. The secondary circuits that need to coordinate between the main transformer protection panel and the 220kV bus differential protection panel include the bus differential protection tripping the main transformer switch, initiating high-voltage side failure, releasing the voltage blocking in case of failure, and tripping all three sides of the main transformer in case of failure. When the main transformer protection operates, it initiates the 220kV bus differential failure and voltage blocking release circuits to ensure that, in the event of a failure of the 220kV main transformer switch, the bus differential protection can trip the bus tie section in the first time limit and trip each bay on the bus in the second time limit, thereby isolating the fault. When the 220kV bus differential protection operates, it will trip all three sides of the main transformer if the 220kV switch of the main transformer fails, thus isolating the fault. When upgrading the main transformer protection and removing the old main transformer protection panel, the DC power supply of the bus differential protection is not disconnected from the DC system. Special attention needs to be paid to the disconnection and connection circuits.

[0079] When the protection type of the main transformer protection panel is the bus differential protection panel type, in the circuit connected to the main transformer protection and the bus differential protection panel, 1) before the main transformer protection panel completes the disconnection safety measures: remove the high-voltage side failure start pressure plate, switch failure unlocking and interlocking pressure plate, three-trip start failure pressure plate, trip three-side bus tie switch pressure plate, interlocking backup automatic transfer pressure plate, and failure main pressure plate, and seal the upper and lower ends of the above pressure plates with insulating tape. Ensure that the normal operation of the operating bay will not be affected by accidental contact during construction, and ensure safety and reliability during construction. 2) before the 220kV bus differential and failure protection panel completes the following disconnection safety measures: seal all terminals, pressure plates, air switches, and non-working equipment except for the secondary circuit terminals involving the main transformer protection that need to be removed. Disconnect the main transformer high-voltage bay current circuit connection piece. 3) Before disconnecting the 110kV bus differential protection panel, perform the following safety measures: Seal all terminals, pressure plates, air switches, and non-working equipment except for those secondary circuit terminals involving the main transformer protection that need to be removed. Disconnect the current circuit connection piece of the main transformer intermediate bay. 4) Determine whether the bus differential circuit is related to the operating equipment. Among them, the main transformer protection side of the trip circuit is the secondary circuit power supply end, and the bus differential protection side that has released the failure voltage lockout is the secondary circuit power supply end. Prioritize removing the cable cores at the power supply end.

[0080] Please see Figure 7 , Figure 7This is a block diagram of the circuit connecting the main transformer protection and the automatic transfer switch in a disconnection and connection method of the present invention. 301 is the main transformer protection panel, 315 is the 10kV automatic transfer switch, 316 is the 110kV automatic transfer switch, 701 is the automatic transfer voltage circuit, 702 is the main transformer protection blocking the 110kV automatic transfer, 703 is the automatic transfer switch tripping the medium-voltage side switch, 704 is the automatic transfer switch tripping the low-voltage side switch, and 705 is the main transformer protection blocking the 10kV automatic transfer. The secondary circuits that need to coordinate between the main transformer protection panel and the automatic transfer switch mainly include the main transformer protection blocking the automatic transfer, the automatic transfer tripping the medium-voltage side switch, and the low-voltage side switch circuit. To ensure the correct operation of the automatic transfer and prevent the automatic transfer device from coinciding with a fault and causing secondary impact on the system, the automatic transfer device is only allowed to operate once, and under certain circumstances, the automatic transfer device needs to be discharged, i.e., the automatic transfer is blocked. When the main transformer backup protection trips, the automatic transfer switch (ATS) must not automatically transfer to the faulty equipment. Therefore, the ATS needs to be blocked. If the wiring of this circuit is incorrect, the ATS may malfunction, causing a secondary impact on the system and expanding the fault area. When upgrading the main transformer protection and removing the old main transformer protection panel, the DC power supply of the ATS panel is not disconnected from the DC system. Special attention needs to be paid to the removal and connection of the circuit.

[0081] When the protection type of the main transformer protection panel is automatic transfer switch (ATS) type, in the circuit connected to the main transformer protection and ATS, 1) before disconnecting the main transformer protection panel, the following safety measures should be taken: Remove the high-voltage side failure start plate, switch failure de-energization lockout plate, three-trip start failure plate, trip three-side bus tie switch plate, lockout ATS plate, and failure main plate, and seal the upper and lower ends of the above plates with insulating tape. This ensures that the normal operation of the operating bay will not be affected by accidental contact during construction, and guarantees safety and reliability during construction. 2) On the 110kV ATS panel, the following safety measures should be taken: Seal all terminals, plates, air switches, and non-working equipment except for those secondary circuit terminals involving the main transformer protection that need to be removed. 3) On the 10kV ATS panel, the following safety measures should be taken: Seal all terminals, plates, air switches, and non-working equipment except for those secondary circuit terminals involving the main transformer protection that need to be removed. 4) Determine whether the automatic transfer switch circuit is related to the operating equipment. Among them, the automatic transfer switch side of the interlocked automatic transfer switch circuit is the secondary circuit power supply end, and the main transformer side of the automatic transfer switch tripping and closing circuit is the secondary circuit power supply end. Prioritize removing the cable cores at the power supply end.

[0082] Please see Figure 8 , Figure 8This is a block diagram of the circuit structure of the main transformer protection and each PT parallel panel in a disconnection and connection method of the present invention. 301 is the main transformer protection panel, 312 is the 10kV PT parallel panel, 313 is the 110kV PT parallel panel, and 317 is the 220kV PT parallel panel. The high, medium, and low voltage sides of the main transformer protection are taken from the 220kV bus, 110kV bus, and 10kV bus voltages, respectively. When modifying the main transformer protection and removing the old main transformer protection panel, the three sides of the main transformer are de-energized. However, since the busbars are still energized and operating normally, the PT parallel panels still have voltage. During substation busbar operation, short-circuit operation of the PT secondary side is not allowed. The PT itself has a relatively low voltage impedance. If a short circuit occurs during the modification process due to an accidental contact with a energized PT circuit, it will result in a large current flowing through the secondary side circuit, causing the secondary voltage circuit breaker to trip, affecting meter recording and indication, or causing malfunction of the protection device. Therefore, it is particularly important to correctly disconnect the voltage circuit wiring and promptly isolate the secondary voltage circuit connection between the modified equipment and the normally operating equipment.

[0083] When the protection type of the main transformer protection panel is the parallel panel type of each PT, in the circuit between the main transformer protection and each PT parallel panel, 1) before the main transformer protection panel completes the disconnection safety measures: remove the high-voltage side failure start pressure plate, switch failure de-energization interlocking pressure plate, three-trip start failure pressure plate, trip three-side bus tie switch pressure plate, interlocking backup automatic transfer pressure plate, and failure main pressure plate, and seal the upper and lower ends of the above pressure plates with insulating tape. Ensure that the normal operation of the operating bay will not be affected by accidental contact during construction, and ensure the safety and reliability of the construction process. 2) Complete the following safety measures in the 220kV PT parallel panel: seal all terminals, pressure plates, air switches and non-working equipment except for the secondary circuit wiring terminals involving the main transformer protection that need to be removed. 3) Complete the following safety measures in the 110kV PT parallel panel: seal all terminals, pressure plates, air switches and non-working equipment except for the secondary circuit wiring terminals involving the main transformer protection that need to be removed. 4) Implement the following safety measures at the 10kV PT parallel panel: Seal all terminals, pressure plates, air switches, and non-operating equipment except for those secondary circuit terminals involving the main transformer protection that need to be removed. 5) Determine whether the PT parallel circuit is related to the operating equipment, and that the PT parallel panel side is the secondary circuit power supply end; prioritize removing the cable cores at the power supply end.

[0084] Step S206: According to the protection type information and the disconnection wiring table, disconnect the circuit wiring corresponding to the main transformer protection panel to be removed, so as to remove the main transformer protection panel to be removed.

[0085] Step S207: Based on the protection type information and the disconnection / removal wiring table, perform the corresponding wiring operation to install the new main transformer protection panel;

[0086] In this embodiment of the invention, based on the disconnection and reconnection table, the wiring operation corresponding to the protection type information is performed to install a new main transformer protection panel.

[0087] In practical implementation, when the protection type of the main transformer protection panel is DC system type, according to the disconnection wiring table, disconnect the power supply, control power supply, and voltage switching power supply box power circuit wiring of the main transformer protection device: 1) At the DC feeder panel, locate terminal 1D-1 and confirm that the cable number is ZL-121 and the circuit number is R1+; at the main transformer protection panel, locate terminal ZD-1 and confirm that the cable number is ZL-121 and the circuit number is R1+. 2) Disconnect the wiring of terminal 1D-1 of the DC feeder panel and use a multimeter to measure that there is no DC voltage on both sides of the cable (ZL-121). 3) Disconnect the wiring of terminal ZD-1 of the main transformer protection panel. 4) After disconnecting the wiring of the terminals on both sides of the cable, short-circuit each cable core to the metal ground at one side panel, and short-circuit one probe of the multimeter to the cable and the other probe to the metal ground at the other side panel. If the multimeter shows that the circuit is conductive, it means that the disconnection is correct. After confirming everything is correct, wrap the dismantled secondary circuit cables with insulating tape. 5) When disconnecting the wiring on both sides of each cable, verify the voltage, disconnect the wires, and reconnect them. Check the completion status in the disconnection log. The executor and the supervisor must confirm before proceeding to disconnect the next cable. The disconnection of other circuits shall be carried out in accordance with the above steps.

[0088] After all other circuit connections have been removed and the old cables have been moved out of the protection panel, the new main transformer protection panel will be installed.

[0089] After confirming the new cable has been placed, connect the new cable to the main transformer protection panel and DC feeder panel according to the disconnection and reconnection schedule: 1) Locate the newly placed cable ZL-121, select the ground as the common line, and align the two ends. Cover both sides of the aligned cable with the numbered conduit (ZL-121 / R1+). 2) At the main transformer protection panel, locate terminal ZD-1 and use a multimeter to measure that there is no DC voltage at this terminal; at the DC feeder panel, locate terminal 1D-1. 3) Connect the ZL-121 / R1+ cable to terminal ZD-1 at the main transformer protection panel; connect the ZL-121 / R1+ cable to terminal 1D-1 at the DC feeder panel. 4) Use a multimeter to verify the DC voltage at both ends and confirm that the wiring is correct. For each circuit connected, the wiring, connection, and voltage verification should be performed, and a checkmark should be placed in the "Completion Status" column of the disconnection and reconnection schedule. The executor and supervisor must confirm before proceeding to the next cable connection. The connection of other circuits should follow the same steps.

[0090] When the protection type of the main transformer protection panel is the bus tie protection panel type, disconnect the control circuit wiring of the 220kV and 110kV bus tie switches of the main transformer protection according to the disconnection wiring table: 1) At the 220kV bus tie protection panel, locate terminal 4Q1D-2 and confirm that the cable number is EML-122 and the circuit number is 101; at the main transformer protection panel, locate terminal 1CD-17 and confirm that the cable number is EML-122 and the circuit number is 101. 2) Disconnect the wiring of terminal 4Q1D-2 of the 220kV bus tie protection panel. Use a multimeter to measure that there is no DC voltage on both sides of the cable (EML-122 / 101). 3) Disconnect the wiring of terminal 1CD-17 of the main transformer protection panel. 4) After disconnecting the terminals on both sides of the cable, short-circuit each cable core to the metal ground at one side of the shield. At the other side of the shield, short-circuit one probe of a multimeter to the cable and the other probe to the metal ground. If the multimeter shows continuity, the disconnection is correct. After confirming that everything is correct, wrap the removed secondary circuit cable with insulating tape. 5) After disconnecting the terminals on both sides of each cable, verify the voltage, disconnect the wires, and reconnect them. Check the completion status in the disconnection log. The executor and the supervisor must confirm before proceeding to disconnect the next cable. The disconnection of other circuits should be carried out in accordance with the above steps.

[0091] After all other circuit connections have been removed and the old cables have been moved out of the protection panel, the new main transformer protection panel will be installed.

[0092] After confirming the new cable has been placed, connect it to the main transformer protection panel and the 220kV and 110kV bus tie protection panels according to the disconnection and reconnection diagram: 1) Locate the newly placed EML-122 cable, select ground as the common line, and wire both ends together. Cover both sides of the wired cable with numbered tubes (EML-122 / 101). 2) At the main transformer protection panel, locate terminal 1CD-17 and use a multimeter to measure that there is no DC voltage at this terminal; at the 220kV bus tie protection panel, locate terminal 4Q1D-2 and use a multimeter to measure the voltage between this terminal and the cable to ground, confirming that there is no potential difference between the terminal and the cable. 3) Connect the EML-122 / 101 cable to terminal 1CD-17 at the main transformer protection panel; connect the EML-122 / 101 cable to terminal 4Q1D-2 at the 220kV bus tie protection panel. 4) Use a multimeter to test the voltage at both ends and confirm that the DC voltage is correct. For each circuit connected, the wiring, connection, and voltage testing should be performed, and a checkmark should be placed in the "Completion Status" column of the connection / disconnection table. The person performing the work and the supervisor must confirm before proceeding to the next cable connection. The connection work for other circuits should be carried out in accordance with the above steps.

[0093] When the protection type of the main transformer protection panel is the bus differential protection panel type, according to the disconnection and reconnection table, disconnect the three circuit connections of the 220kV and 110kV bus differential trip main transformer switch, start high voltage side failure, release failure voltage lockout, and failure trip main transformer: 1) At the 220kV bus differential and failure protection panel, find terminal 1Q1D-1. The circuit function is to release failure voltage lockout. Confirm that the cable number is 1B-145 and the circuit number is 051. At the main transformer protection panel, find terminal 1CD-7. Confirm that the cable number is 1B-145 and the circuit number is 051. 2) Disconnect the 1Q1D-1 power supply side terminal connection of the 220kV bus differential and failure protection panel. Use a multimeter to measure that there is no DC voltage on both sides of the cable (1B-145 / 051). 3) Disconnect the 1CD-7 terminal connection of the main transformer protection panel. 4) After disconnecting the terminals on both sides of the cable, short-circuit each cable core to the metal ground at one side of the shield. At the other side of the shield, short-circuit one probe of a multimeter to the cable and the other probe to the metal ground. If the multimeter shows continuity, the disconnection is correct. After confirming that everything is correct, wrap the removed secondary circuit cable with insulating tape. 5) After disconnecting the terminals on both sides of each cable, verify the voltage, disconnect the wires, and reconnect them. Check the completion status in the disconnection log. The executor and the supervisor must confirm before proceeding to disconnect the next cable. The disconnection of other circuits should be carried out in accordance with the above steps.

[0094] After all other circuit connections have been removed and the old cables have been moved out of the protection panel, the new main transformer protection panel will be installed.

[0095] After confirming the new cable has been placed, connect it to the main transformer protection panel and the 220kV and 110kV bus differential protection panels according to the disconnection and reconnection diagram: 1) Locate the newly placed cable 1B-145, select ground as the common line, and wire both ends together. Cover both sides of the wired cable with numbered tubing (1B-145 / 051). 2) At the main transformer protection panel, locate terminal 1CD-7 and use a multimeter to measure that there is no DC voltage at this terminal. At the 220kV bus differential and failure protection panel, locate terminal 1Q1D-1 and use a multimeter to measure the voltage between this terminal and the cable, confirming there is no potential difference between the terminal and the cable. 3) Connect cable 1B-145 / 051 to terminal 1CD-7 at the main transformer protection panel; connect cable 1B-145 / 051 to terminal 1Q1D-1 at the 220kV bus differential and failure protection panel. 4) Use a multimeter to test the voltage at both ends and confirm that the DC voltage is correct. For each circuit connected, the wiring, connection, and voltage testing should be performed, and a checkmark should be placed in the "Completion Status" column of the connection / disconnection table. The person performing the work and the supervisor must confirm before proceeding to the next cable connection. The connection work for other circuits should be carried out in accordance with the above steps.

[0096] When the protection type of the main transformer protection panel is automatic transfer switch type, according to the disconnection and reconnection table, disconnect the main transformer protection operation blocking 110kV, 10kV automatic transfer switch, automatic transfer switch tripping main transformer medium voltage side, and low voltage side switch circuits: 1) At the 110kV automatic transfer switch, locate terminal QD-24 and confirm that the cable number is BZT-125 and the circuit number is 169; at the main transformer protection panel, locate terminal 1KD-29 and confirm that the cable number is BZT-125 and the circuit number is 169. 2) Disconnect the wiring of terminal QD-24 of the 110kV automatic transfer switch and use a multimeter to measure that there is no DC voltage on both sides of the cable (BZT-125). 3) Disconnect the wiring of terminal 1KD-29 of the main transformer protection panel. 4) After disconnecting the terminals on both sides of the cable, short-circuit each cable core to the metal ground at one side of the shield. At the other side of the shield, short-circuit one probe of a multimeter to the cable and the other probe to the metal ground. If the multimeter shows continuity, the disconnection is correct. After confirming that everything is correct, wrap the removed secondary circuit cable with insulating tape. 5) After disconnecting the terminals on both sides of each cable, verify the voltage, disconnect the wires, and reconnect them. Check the completion status in the disconnection log. The executor and the supervisor must confirm before proceeding to disconnect the next cable. The disconnection of other circuits should be carried out in accordance with the above steps.

[0097] After all other circuit connections have been removed and the old cables have been moved out of the protection panel, the new main transformer protection panel will be installed.

[0098] After confirming the new cable has been placed, connect it to the main transformer protection panel and the 110kV and 10kV automatic transfer switch panels according to the disconnection and reconnection diagram: 1) Locate the newly placed cable BZT-125, select ground as the common line, and wire both ends together. Cover both sides of the wired cable with numbered tubing (BZT-125 / 151). 2) At the main transformer protection panel, locate terminal 1CD-29 and use a multimeter to measure that there is no DC voltage at this terminal. At the 110kV automatic transfer switch panel, locate terminal QD-6 and use a multimeter to measure the voltage between this terminal and the cable, confirming there is no potential difference between the terminal and the cable. 3) Connect the BZT-125 / 151 cable to terminal 1CD-29 at the main transformer protection panel; connect the BZT-125 / 151 cable to terminal QD-6 at the 110kV automatic transfer switch panel. 4) Use a multimeter to test the voltage at both ends to confirm the DC voltage and that the wiring is correct. For each circuit connected, the wiring, connection, and voltage testing should be performed, and a checkmark should be placed in the "Completion Status" column of the connection / disconnection table. The person performing the work and the supervisor must confirm before proceeding to the next cable connection. The connection work for other circuits should be carried out in accordance with the above steps.

[0099] When the protection type of the main transformer protection panel is the parallel panel type of each PT, disconnect the voltage circuit before switching the main transformer protection panel according to the disconnection wiring table: 1) At the main transformer protection panel, locate terminal 1UD-26 and confirm that the cable number is EYH-231 and the circuit number is A630I; at the 220kV PT parallel panel, locate terminal 1U1D-2 and confirm that the cable number is EYH-231 and the circuit number is A630I. 2) Disconnect the wiring of terminal 1U1D-2 at the power supply end of the 220kV PT parallel panel. 3) Use a multimeter to measure that there is no AC voltage on both sides of the A630I circuit of the cable core (EYH-231), and disconnect the wiring of terminal 1UD-26 of the main transformer protection panel. 4) After disconnecting the terminals on both sides of the cable core, short-circuit each cable core to the metal ground at one side of the shield. At the other side of the shield, short-circuit one probe of a multimeter to the cable and the other probe to the metal ground. If the multimeter shows continuity, the disconnection is correct. After confirming that everything is correct, wrap the disconnected secondary circuit cable cores with insulating tape. 5) After disconnecting the terminals on both sides of each cable, verify the voltage, disconnect the wires, and reconnect them. Check the completion status in the disconnection log. The executor and the supervisor must confirm before proceeding to disconnect the next cable. The disconnection of other circuits should be carried out in accordance with the above steps.

[0100] After all other circuit connections have been removed and the old cables have been moved out of the protection panel, the new main transformer protection panel will be installed.

[0101] After confirming the new cable has been placed, connect it to the main transformer protection panel and the 220kV, 110kV, and 10kV PT parallel panels according to the disconnection and reconnection diagram: 1) Locate the newly placed cable EYH-231, select the metal ground as the common line, and perform a two-way connection. Verify that both ends of the cable cores are fitted with numbered tubes (EYH-231 / A630I). 2) At the 220kV PT parallel panel, locate terminal 1U1D-2; at the main transformer protection panel, locate terminal 1UD-26. Use a multimeter to measure that there is no AC voltage at these terminals. 3) Connect the EYH-231 / A630I cable to terminal 1UD-26 at the main transformer protection panel; connect the EYH-231 / A630I cable to terminal 1U1D-2 at the 220kV PT parallel panel. 4) Use a multimeter to verify that the AC voltage at both ends of the circuit is normal and the wiring is correct. For each circuit connected, the wiring, connection, and voltage testing should be performed, and a checkmark should be placed in the "Completion Status" column of the connection / disconnection table. The person performing the work and the supervisor must confirm before proceeding to the next cable connection. The connection work for other circuits should be carried out in accordance with the above steps.

[0102] Step S208: Verify whether the new main transformer protection panel is operating normally;

[0103] In this embodiment of the invention, the voltage sampling value is checked and the voltage switching function is verified for the new main transformer protection to confirm that the main transformer protection is operating correctly and to ensure that the new circuit disconnection and wiring are correct.

[0104] The disconnection and reconnection method provided in this embodiment of the invention, in response to a replacement command, acquires the cable core circuit information and protection type information of the main transformer protection panel to be dismantled, as well as the actual site survey information and disconnection and reconnection risk data. Based on the cable core circuit information, the actual site survey information, and the disconnection and reconnection risk data, a disconnection and reconnection table is established. The disconnection and reconnection table is corrected according to a preset inspection standard to obtain a target disconnection and reconnection table. Based on the target disconnection and reconnection table, disconnection and reconnection operations corresponding to the protection type information are performed to install a new main transformer protection panel. This disconnection and reconnection method solves the technical problem that the lack of a circuit wiring confirmation process during secondary circuit modification can easily lead to safety accidents, thus improving the work efficiency of disconnection and reconnection.

[0105] Please see Figure 9 , Figure 9 This is a structural block diagram of an embodiment of the disconnection and reconnection device of the present invention, comprising:

[0106] The acquisition module 901 is used to acquire, in response to the replacement command, the cable core circuit information and protection type information of the protection panel of the main transformer to be removed, as well as the actual on-site survey information and disassembly risk data;

[0107] Module 902 is used to establish a disconnection table based on the cable core circuit information, the actual on-site survey information, and the disconnection risk data;

[0108] The calibration module 903 is used to calibrate the disconnection line table according to a preset inspection standard to obtain the target disconnection line table;

[0109] Installation module 904 is used to perform disconnection and reconnection operations corresponding to the protection type information based on the target disconnection and reconnection table, so as to install a new main transformer protection panel.

[0110] In an optional embodiment, the establishment module 902 includes:

[0111] A generation submodule is used to generate a preliminary disconnection table based on the cable core circuit information;

[0112] The sorting submodule is used to sort the disassembly and reassembly sequence data of the preliminary disassembly and reassembly line table according to the high and low levels of the disassembly and reassembly risk data, based on the actual on-site survey information and the disassembly-to-reassembly order standard, to obtain the disassembly and reassembly line table.

[0113] In an optional embodiment, the installation module 904 includes:

[0114] The security submodule is used to implement the security measures corresponding to the protection type information;

[0115] The dismantling submodule is used to dismantle the circuit wiring corresponding to the main transformer protection panel to be dismantled, according to the protection type information and the dismantling wiring table, so as to remove the main transformer protection panel to be dismantled.

[0116] The installation submodule is used to perform corresponding wiring operations based on the protection type information and the disconnection / removal wiring table to install the new main transformer protection panel.

[0117] In an optional embodiment, the apparatus further includes:

[0118] The verification module is used to verify whether the new main transformer protection panel is operating normally.

[0119] This invention also provides an electronic device, including a memory and a processor. The memory stores a computer program, which, when executed by the processor, causes the processor to perform the steps of the duplicate claim identification method as described in any of the above embodiments.

[0120] This invention also provides a computer storage medium storing a computer program thereon, which, when executed by the processor, implements the steps of the duplicate claim identification method as described in any of the above embodiments.

[0121] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0122] In the several embodiments provided in this application, it should be understood that the methods, apparatuses, electronic devices, and storage media disclosed in this invention can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0123] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0124] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0125] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned readable storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0126] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for disconnecting a wire, characterized in that, include: In response to a replacement command, obtain information on the cable core circuit and protection type of the main transformer protection panel to be dismantled, as well as information on the actual on-site survey and dismantling risk data; Based on the cable core circuit information, the actual site survey information, and the disconnection / reconnection risk data, a disconnection / reconnection table is established, including: generating a preliminary disconnection / reconnection table based on the cable core circuit information; sorting the disconnection / reconnection sequence data in the preliminary disconnection / reconnection table according to the order of disconnection / reconnection risk data based on the actual site survey information and the disconnection / reconnection priority criteria, to obtain the final disconnection / reconnection table; and correcting the disconnection / reconnection table according to a preset inspection standard to obtain the target disconnection / reconnection table. Based on the target disconnection and reconnection table, perform the disconnection and reconnection operations corresponding to the protection type information to install a new main transformer protection panel, including: completing the safety measures corresponding to the protection type information; disconnecting the circuit wiring corresponding to the main transformer protection panel to be removed according to the protection type information and the disconnection and reconnection table to remove the main transformer protection panel to be removed; and performing the corresponding wiring operations based on the protection type information and the disconnection and reconnection table to install the new main transformer protection panel. Verify whether the new main transformer protection panel is operating normally.

2. A disconnection / removal device, characterized in that, include: The acquisition module is used to respond to the replacement command by acquiring the cable core circuit information and protection type information of the protection panel of the main transformer to be disassembled, as well as the actual on-site survey information and disassembly risk data. A module is established to create a disconnection and reconnection table based on the cable core circuit information, the actual site survey information, and the disconnection and reconnection risk data. This module includes a generation submodule and a sorting submodule. The generation submodule generates a preliminary disconnection and reconnection table based on the cable core circuit information. The sorting submodule sorts the disconnection and reconnection sequence data in the preliminary disconnection and reconnection table according to the order of disconnection and reconnection risk, based on the actual site survey information and the principle of disconnection before reconnection, to obtain the final disconnection and reconnection table. The calibration module is used to calibrate the disconnection line table according to a preset inspection standard to obtain the target disconnection line table. The installation module is used to perform disconnection and reconnection operations corresponding to the protection type information based on the target disconnection and reconnection table, so as to install a new main transformer protection panel. It includes a safety submodule, a removal submodule and an installation submodule. The safety submodule is used to implement the safety measures corresponding to the protection type information. The removal submodule is used to remove the circuit wiring corresponding to the main transformer protection panel to be removed according to the protection type information and the disconnection wiring table, so as to remove the main transformer protection panel to be removed. The installation submodule is used to perform corresponding wiring operations based on the protection type information and the disconnection and reconnection table in order to install the new main transformer protection panel. The verification module is used to verify whether the new main transformer protection panel is operating normally.

3. An electronic device, characterized in that, It includes a processor and a memory, the memory storing computer-readable instructions that, when executed by the processor, perform the method as described in claim 1.

4. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it performs the method as described in claim 1.

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