A power control cabinet for a multi-level lightning protection integrated system and a manufacturing method thereof

Abstract

The present invention belongs to the technical field of power cabinets and their manufacturing, and specifically relates to a power control cabinet of a multi-level lightning protection integrated system and a manufacturing method thereof, comprising a power control cabinet, a lightning rod grounding body for conducting the internal current of the power control cabinet and the lightning strike electricity into the earth; a gas-insulated high-voltage power cabinet, and the interior of the gas-insulated high-voltage power cabinet is filled with C5F10O / Air mixed gas, a lightning disconnection component, which is used to disconnect the electrical connection between the gas-insulated high-voltage power cabinet and the low-voltage distribution cabinet when a lightning strike occurs; a lightning separation component, which is used to drive the low-voltage distribution cabinet to leave the gas-insulated high-voltage power cabinet and hinder the current conduction when a lightning strike occurs; an inner lightning induction shell, which is used to conduct the current conducted in the power control cabinet to the lightning rod grounding body. The present invention has multiple lightning protections, which can reduce the conduction of current between the power connection bodies and between the cabinets, and can conduct the current in the cabinet to the earth, and also provides a lightning simulation detection work.

Description

Technical Field

[0001] The invention belongs to the technical field of power cabinets and manufacturing thereof, and particularly relates to a power control cabinet of a multi-level lightning protection integrated system and a manufacturing method thereof. Background Art

[0002] The power control cabinet is a device that integrates a variety of electrical components and is used to control and manage various functions of the power system. It usually includes the following functions and features:

[0003] Composition of the control system: The power control cabinet usually contains switchgear, measuring instruments, protective electrical appliances and auxiliary equipment. These components are assembled in a metal cabinet according to the electrical wiring requirements to ensure the normal operation and safety of the system;

[0004] Operation mode: The power control cabinet can connect or disconnect the circuit manually or automatically. In case of failure or abnormal operation, the protective device will automatically cut off the circuit or sound an alarm to protect the safety of people and equipment.

[0005] Monitoring and adjustment: Through measuring instruments, the power control cabinet can display various parameters in operation and allow adjustment of certain electrical parameters. If the system deviates from the normal working state, the control cabinet will prompt or send a signal;

[0006] Problems with existing technologies:

[0007] When the power cabinet is struck by lightning, even if the power cabinet is not directly struck by lightning, the strong electromagnetic field changes generated by the lightning current may also generate a high potential difference between the power cabinet and the metal parts of the down conductor. The high potential acts on the electrical lines and electrical equipment, which will directly cause their damage. In addition, in some cases, if the internal electric field strength of the solid insulating medium is lower than the electric field strength of the air gap at the edge of the electrode, and the surface breakdown voltage is not large, surface discharge may occur on the surface of the insulating medium, causing the cabinet to discharge to the nearby air, and the adjacent cabinets will also conduct electricity under the condition of surface discharge;

[0008] In addition, the existing control cabinet manufacturing process usually does not have more accurate lightning simulation detection work, and there is still room for improvement in detecting the discharge location, discharge area and local micro-discharge. Summary of the invention

[0009] The purpose of the present invention is to provide an electric power control cabinet of a multi-level lightning protection integrated system and a manufacturing method thereof, which has multiple lightning protections, can reduce the conduction of current between power connections and between cabinets, can conduct the current in the cabinet to the earth, and also provides a lightning strike simulation detection work.

[0010] The technical solution adopted by the present invention is as follows:

[0011] A power control cabinet of a multi-level lightning protection integrated system, comprising:

[0012] Power control cabinet, lightning rod grounding body used to conduct the internal current of the power control cabinet and lightning strike electricity into the earth;

[0013] Gas-insulated high-voltage power cabinet, which is fixedly installed inside the power control cabinet, and the interior of the gas-insulated high-voltage power cabinet is filled with C5F10O / Air mixed gas;

[0014] Low-voltage distribution cabinet, which is slidably assembled on both sides of the gas-insulated high-voltage power cabinet;

[0015] A lightning disconnect assembly, which is used to disconnect the electrical connection between the gas-insulated high-voltage power cabinet and the low-voltage distribution cabinet when a lightning strike occurs;

[0016] With the help of the current generated by lightning strike, the insulating gas enters the interior of each sealed connection chamber, and disconnects the second power connection body from the first power connection body, thus stopping the power supply of the low-voltage distribution cabinet in an emergency;

[0017] A lightning separation component, which is used to drive the low-voltage distribution cabinet away from the gas-insulated high-voltage power cabinet and hinder current conduction when a lightning strike occurs;

[0018] With the help of the current generated by lightning strike, the current conduction phenomenon caused by mutual discharge between cabinets is reduced, and the flow of current in the cabinet is hindered;

[0019] The inner lightning conductor shell is used to guide the current conducted in the power control cabinet to the grounding body of the lightning rod;

[0020] Similarly, the lightning current is used to make the lightning rod pop out, and the current flowing in the cabinet is led down to the grounding body and directed to the earth.

[0021] A pressure relief cabinet is arranged at the bottom of the gas-insulated high-voltage power cabinet, and the gas-insulated high-voltage power cabinet and the pressure relief cabinet are connected via a pipeline equipped with a gas valve.

[0022] Ground rails are installed on both sides of the bottom end of the power control cabinet, and inline skates for sliding assembly with the ground rails are installed at the bottom of the low-voltage distribution cabinet.

[0023] The lightning strike disconnect assembly includes a high-distribution resistor, a C5F10O / Air mixed gas storage tank, a solenoid valve, and a sealed connection chamber. The top of the high-distribution resistor is connected to a conductor through an electric wire, and the conductor is fixedly installed on the inner wall of the lightning strike gas distribution cabinet at the top. The solenoid valve is arranged below the C5F10O / Air mixed gas storage tank, and the air outlet end of the C5F10O / Air mixed gas storage tank is connected to the air inlet end of the solenoid valve through an air pipe, and the air outlet end of the solenoid valve is connected to multiple pipes.

[0024] The sealed connection chamber is arranged between the gas-insulated high-voltage power cabinet and the low-voltage distribution cabinet. A first power connection body is fixedly installed at one end of the interior of the sealed connection chamber, and the first power connection body is connected to the electrical equipment in the low-voltage distribution cabinet through electric wires. A second power connection body is rotatably installed at the other end of the interior of the sealed connection chamber, and the second power connection body is connected to the power supply end in the gas-insulated high-voltage power cabinet through electric wires. The second power connection body is detachably connected to the first power connection body.

[0025] The ends of each branch of the multi-branch tube are connected to the corresponding sealed connection chamber, an air pipe is integrally arranged at the upper oblique part of the sealed connection chamber, and an air plug is slidably assembled inside the air pipe, and the air plug is connected to the adjacent electrical connection body 2 through a connecting rod.

[0026] The lightning strike separation component includes two high-distribution resistors, two C5F10O / Air mixed gas storage tanks, two solenoid valves and an air guide slide pipe. The top of the two high-distribution resistors is connected to two conductors through electric wires, and the two conductors are fixedly installed on the inner wall of the lightning strike gas distribution cabinet at the top in a fitting manner. The two solenoid valves are arranged below the two C5F10O / Air mixed gas storage tanks, and the air outlet end of the two C5F10O / Air mixed gas storage tanks is connected to the air inlet end of the two solenoid valves through two air pipes, and the air outlet end of the two solenoid valves is connected to two multi-branch pipes.

[0027] The air guide slide is arranged between the side walls of the gas-insulated high-voltage power cabinet and the low-voltage distribution cabinet, the ends of the two branches of the multi-branch pipe are connected to the middle of the corresponding air guide slide, the two ends of the inside of the air guide slide are symmetrically slidably assembled with pipe plugs, and the side walls of the pipe plugs are fixedly connected with push rods extending to the outside of the air guide slide, the ends of the push rods located at the two ends are respectively connected to the outer walls of the gas-insulated high-voltage power cabinet and the low-voltage distribution cabinet, and the outer surface of the air guide slide is wound with a resistance wire.

[0028] A lightning rod is rotatably installed inside the inner lightning induction shell, and a spring for popping out the lightning rod is arranged at one end of the inner lightning induction shell away from the lightning rod adapter, and the springs are connected to the grounding body of the lightning rod through a wire, and a shell cover is symmetrically rotatably installed on the top of the inner lightning induction shell through rotating arms on both sides;

[0029] Levers are rotatably installed on both side walls of the inner lightning induction shell, and a sealing line is commonly connected to one end of the levers on both sides close to the adapter. The sealing line is placed above the shell cover and is used to seal the shell cover. Conductors three installed in contact with the inner wall of the power control cabinet are arranged on both sides of the inner lightning induction shell, and an electric fuse is connected between two adjacent conductors three, and the electric fuses respectively pass through one end of the corresponding lever away from the adapter.

[0030] A method for manufacturing a power control cabinet of a multi-level lightning protection integrated system, the specific steps are as follows:

[0031] Step 1: Design phase;

[0032] Determine the functional requirements and use environment of the power cabinet, formulate the design plan of the power cabinet, draw the layout and wiring diagram of the power cabinet, and select appropriate materials and components;

[0033] Step 2: Material selection;

[0034] Generally, the materials used to make power cabinets are divided into two types: hot-rolled steel plates and cold-rolled steel plates. Cold-rolled steel plates are more suitable for making power cabinets because of their soft texture.

[0035] Step 3: Manufacturing process;

[0036] Carry out cutting, bending and other processing according to the design drawings, assemble various parts, ensure the stability of the structure and the correct position of the components, and carry out wiring and wiring according to the circuit diagram;

[0037] Step 4: Inspection and testing;

[0038] After assembly, test the various functions of the power cabinet to ensure that its performance meets the design requirements. Add a lightning simulation test to simulate the performance under direct and induced lightning to check for safety hazards such as short circuits and leakage.

[0039] Step 5: Packaging and transportation;

[0040] Properly package the completed power cabinets to prevent damage during transportation, prepare relevant shipping documents and documentation, and arrange logistics transportation.

[0041] A method for manufacturing a power control cabinet of a multi-level lightning protection integrated system, the specific steps of lightning strike simulation detection work are as follows:

[0042] Step 1: Preparation stage;

[0043] Ensure that all test equipment and safety measures are in place, and prepare equipment to simulate lightning strikes, such as lightning current generators, and instruments for measuring parameters such as voltage, current, and temperature;

[0044] Step 2: Adjust the distance;

[0045] Adjust the distance between the low-voltage distribution cabinet and the lightning rod grounding body according to the standard to ensure that the air distance between the distribution cabinet and the ground wire meets the specific requirements;

[0046] Step 3: Improve grounding resistance;

[0047] Improve the area and depth of the grounding body under the lightning rod, and use chemical resistance reducing agents to improve the ground resistivity, so that the grounding resistance of the system is reduced to below 4Ω;

[0048] Step 4: Simulate lightning strike;

[0049] Use lightning current generators to simulate different types and intensities of lightning strikes, including direct lightning strikes, induction lightning strikes, etc., and use ultrasonic detection (AE), transient earth voltage detection (TEV) and ultra-high frequency detection (UHF) to detect the discharge of power cabinets;

[0050] Step 5: Analyze the results;

[0051] Analyze the data collected during the simulated lightning strike, analyze the data from different detection methods to improve the accuracy of the detection, evaluate the lightning protection performance of the power cabinet, and if any problems are found, such as component damage or abnormal data, make corresponding adjustments to the design or configuration of the power cabinet.

[0052] The technical effects achieved by the present invention are:

[0053] In the present invention, the C5F10O / Air mixed gas filled inside the gas-insulated high-voltage power cabinet is used to meet the requirements of the power industry on the insulation performance of high-voltage electrical equipment, and it can also play a certain role in hindering current conduction and cabinet discharge when the cabinet is struck by lightning, and is a lightning protection line for protecting the internal equipment of the gas-insulated high-voltage power cabinet.

[0054] The present invention uses the current generated by lightning strike to make the insulating gas inside the C5F10O / Air mixed gas storage tank one enter the inside of each sealed connection chamber, and promotes the disconnection between the second power connection body and the first power connection body, so as to urgently stop the power supply of the low-voltage distribution cabinet. The low-voltage distribution cabinet can be equipped with a delay protector to prevent the equipment from being damaged due to instantaneous power failure, and this power failure method can reduce the damage of high voltage current to electrical equipment as much as possible, greatly reducing the degree of damage. In addition, using the C5F10O / Air mixed gas to fill the sealed connection chamber can also reduce the conduction of current between the second power connection body and the first power connection body, further hindering the conduction of lightning current.

[0055] The present invention uses the current generated by lightning strike to make the push rod extend from the inside of the gas guide slide tube, so as to promote the power distribution cabinet to be away from the gas insulated high-voltage power cabinet, increase the distance between the cabinets, and reduce the current conduction phenomenon caused by mutual discharge between the cabinets. In addition, the insulating gas filled in the gas guide slide tube and the resistance wire arranged on the outer surface of the gas guide slide tube can hinder the current conducted along the gas guide slide tube, further hinder the flow of current in the cabinet, and reduce the influence of the lightning current on the cabinet.

[0056] The present invention also utilizes the lightning current to make the originally stored lightning rod pop out quickly, guide part of the current flowing in the cabinet to the lightning rod and then to the ground, thereby improving the lightning protection ability of the cabinet.

[0057] The present invention provides a lightning strike simulation detection method, wherein the ultrasonic detection method is very effective for detecting partial discharge inside the switch cabinet, because it can capture the mechanical vibration generated by the partial discharge. This method is highly sensitive to identifying and locating the discharge source and is not affected by electromagnetic interference; the transient ground voltage detection method identifies the discharge phenomenon by measuring the high-frequency partial discharge signal on the surface of the metal cabinet. This method is simple and easy to implement, and can quickly scan a large area to determine whether there is partial discharge activity. The ultra-high frequency detection method identifies the discharge phenomenon by capturing the ultra-high frequency electromagnetic waves generated by the partial discharge. It is very sensitive to tiny partial discharges and can detect partial discharges at an early stage, thereby helping to prevent potential equipment failures; in addition, the detection accuracy can be improved by comparing and analyzing the data of different detection methods. For example, by comparing the data obtained by the ultrasonic and transient ground voltage detection methods, the location of the discharge can be determined more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 is an integrated cross-sectional structural diagram of a power control cabinet provided by an embodiment of the present invention;

[0059] Figure 2 It is a cross-sectional structural diagram of a gas-insulated high-voltage power cabinet and a lightning disconnect assembly provided by an embodiment of the present invention;

[0060] Figure 3 is a structural diagram of a lightning disconnect assembly provided by an embodiment of the present invention;

[0061] Figure 4 is a cross-sectional structural diagram of a sealed connection chamber provided by an embodiment of the present invention;

[0062] Figure 5 is a structural diagram of a lightning strike separation assembly provided by an embodiment of the present invention;

[0063] Figure 6 is a cross-sectional structural diagram of an air guide slide pipe provided by an embodiment of the present invention;

[0064] Figure 7 It is an integrated structural diagram of the inner lightning induction shell and the lightning rod down-conducting grounding body provided by an embodiment of the present invention;

[0065] Figure 8 It is the structure and cross-sectional view of the inner lightning induction shell provided by the embodiment of the present invention;

[0066] Fig. 9 is a flow chart of a manufacturing method provided by an embodiment of the present invention;

[0067] Fig.10 It is a flow chart of the lightning strike simulation detection work provided by an embodiment of the present invention.

[0068] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0069] 1. Power control cabinet; 2. Gas insulated high-voltage power cabinet; 201. Pressure relief cabinet; 3. Lightning gas distribution cabinet; 4. Low-voltage distribution cabinet; 401. Ground rail; 5. Lightning disconnect assembly; 501. Conductor 1; 502. High-voltage resistor 1; 503. C5F10O / Air mixed gas storage tank 1; 504. Air pipe 1; 505. Solenoid valve 1; 506. Multi-branch pipe 1; 507. Sealed connection chamber; 508. Electrical connection 1; 509. Electrical connection 2; 510. Air pipe; 511. Air plug; 512. Connecting rod; 6. Lightning separation assembly; 601. Conductor 2; 602. High-end resistor 2; 603. C5F10O / Air mixed gas storage tank 2; 604. Air pipe 2; 605. Solenoid valve 2; 606. Multi-branch pipe 2; 607. Air guide slide pipe; 608. Pipe plug; 609. Push rod; 610. Resistance wire; 7. Internal lightning conductor shell; 701. Rotating arm; 702. Shell cover; 703. Lightning rod; 704. Spring; 705. Capping wire; 706. Lever; 707. Electric fuse; 708. Conductor 3; 709. Wire; 8. Lightning rod down to ground. DETAILED DESCRIPTION

[0070] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0071] like Figure 1-8 As shown, a power control cabinet of a multi-level lightning protection integrated system includes: a power control cabinet 1, and a lightning rod grounding body 8 for conducting the internal current of the power control cabinet 1 and lightning strike electricity into the earth.

[0072] See attached Figure 2, the low-voltage distribution cabinet 4 is slidably assembled on both sides of the gas-insulated high-voltage power cabinet 2, and ground rails 401 are installed on both sides of the bottom end of the power control cabinet 1, and the bottom of the low-voltage distribution cabinet 4 is installed with inline skates for sliding assembly with the ground rails 401.

[0073] Embodiment 1:

[0074] See attached Figure 2 , a gas-insulated high-voltage power cabinet 2, the gas-insulated high-voltage power cabinet 2 is fixedly installed inside the power control cabinet 1, and the interior of the gas-insulated high-voltage power cabinet 2 is filled with a C5F10O / Air mixed gas, a pressure relief cabinet 201 is arranged at the bottom of the gas-insulated high-voltage power cabinet 2, and the gas-insulated high-voltage power cabinet 2 is connected to the pressure relief cabinet 201 through a pipeline equipped with a gas valve.

[0075] According to the above structure, C5F10O / Air mixed gas is also known as: AirPlus, which is a type of environmentally friendly insulating gas. It can replace sulfur hexafluoride SF6 in electrical performance and has less impact on the environment. The research and development and application of these gases are to meet the requirements of the power industry for the insulation performance of high-voltage electrical equipment, while reducing the greenhouse effect and environmental impact of traditional gases such as SF6. It is an environmentally friendly insulating gas developed by 3M and has been used in actual equipment. For example, ABB uses this gas in EWZ's 170 kV GIS, which is the first gas-insulated switchgear using environmentally friendly insulating gas;

[0076] Furthermore, the gas-insulated high-voltage power cabinet 2 is used to complete the transmission and voltage reduction of electricity. The C5F10O / Air mixed gas filled inside it is used to meet the power industry's requirements for the insulation performance of high-voltage electrical equipment. It can also play a certain role in hindering current conduction and cabinet discharge when the cabinet is struck by lightning. It is a lightning protection line to protect the internal equipment of the gas-insulated high-voltage power cabinet 2.

[0077] The working principle of the present invention is as follows: the gas-insulated high-voltage power cabinet 2 is used to complete the transmission and voltage reduction of electric power, and the C5F10O / Air mixed gas filled inside it is used to meet the requirements of the power industry for the insulation performance of high-voltage electrical equipment, and it can also play a certain role in hindering current conduction and hindering cabinet discharge when the cabinet is struck by lightning.

[0078] Embodiment 2:

[0079] See attached Figure 3-Figure 4, a lightning strike disconnecting component 5, which is used to disconnect the electrical connection between the gas-insulated high-voltage power cabinet 2 and the low-voltage distribution cabinet 4 when a lightning strike occurs, and the lightning strike disconnecting component 5 includes a high-voltage resistor 502, a C5F10O / Air mixed gas storage tank 503, a solenoid valve 505 and a sealed connection chamber 507. The top of the high-voltage resistor 502 is connected to a conductor 501 through an electric wire, and the conductor 501 is fixedly installed on the inner wall of the lightning strike distribution cabinet 3 at the top in a fitting manner. The solenoid valve 505 is arranged below the C5F10O / Air mixed gas storage tank 503, and the air outlet end of the C5F10O / Air mixed gas storage tank 503 is connected to the air inlet end of the solenoid valve 505 through an air pipe 504, and the air outlet end of the solenoid valve 505 is connected to multiple branch pipes 506.

[0080] See attached Figure 3-Figure 4 The sealed connection chamber 507 is arranged between the gas-insulated high-voltage power cabinet 2 and the low-voltage distribution cabinet 4. A power connection body 508 is fixedly installed at one end inside the sealed connection chamber 507, and the power connection body 508 is connected to the electrical equipment in the low-voltage distribution cabinet 4 through wires. A power connection body 509 is rotatably installed at the other end inside the sealed connection chamber 507, and the power connection body 509 is connected to the power supply end in the gas-insulated high-voltage power cabinet 2 through wires. The power connection body 509 and the power connection body 508 are detachably connected.

[0081] See attached Figure 3-Figure 4 The ends of each branch of the multi-branch tube 506 are connected to the corresponding sealed connection chamber 507, and an air pipe 510 is integrally arranged at the upper oblique part inside the sealed connection chamber 507, and an air plug 511 is slidably assembled inside the air pipe 510, and the air plug 511 is connected to the adjacent electrical connection body 2 509 through a connecting rod 512.

[0082] According to the above structure, when the power control cabinet 1 encounters direct lightning or induced lightning, through the process of cabinet discharge and current conduction, the power connection body 508 reduces the voltage through the high-voltage resistor 502 after receiving the current, and the solenoid valve 505 is triggered to work and open with the help of the reduced-voltage current. At this time, the C5F10O / Air mixed gas inside the C5F10O / Air mixed gas storage tank 503 will be quickly released under the action of the internal high air pressure, and the insulating gas will enter the sealed connection chambers 507 through the multi-branch pipe 506 and increase the internal air pressure. Then the gas plug 511 will move under the action of the air pressure, and finally drive the power connection body 2 509 to separate from the power connection body 1 508 through the connecting rod 512, and the gas-insulated high-voltage power cabinet 2 and the low-voltage power cabinet 2 will be separated. The electrical connection between the low-voltage distribution cabinet 4 is disconnected. In the above process, with the help of the current generated by lightning strike, the insulating gas inside the C5F10O / Air mixed gas storage tank 1 503 enters into each sealed connection chamber 507, and causes the connection body 2 509 to be disconnected from the connection body 1 508, thereby urgently stopping the power supply of the low-voltage distribution cabinet 4. The low-voltage distribution cabinet 4 can be equipped with a delayed protector to prevent the equipment from being damaged due to instantaneous power failure, and this power failure method can minimize the damage caused by high voltage current to electrical equipment, greatly reducing the degree of damage. In addition, filling the sealed connection chamber 507 with C5F10O / Air mixed gas can also reduce the conduction of current between the connection body 2 509 and the connection body 1 508, further hindering the conduction of lightning current.

[0083] The working principle of the present invention is as follows: when the power control cabinet 1 encounters direct lightning or induced lightning, through the process of cabinet discharge and current conduction, the power connector 508 receives the current and then reduces the voltage through the high-voltage resistor 502. The solenoid valve 505 is triggered to work and open with the help of the reduced-voltage current. At this time, the C5F10O / Air mixed gas inside the C5F10O / Air mixed gas storage tank 503 will be quickly released under the action of the internal high air pressure, and the insulating gas will enter the sealed connection chambers 507 through the multi-branch pipe 506 and increase the internal air pressure. Then the gas plug 511 will move under the action of the air pressure, and finally drive the power connector 2 509 to separate from the power connector 1 508 through the connecting rod 512, and the electrical connection between the gas-insulated high-voltage power cabinet 2 and the low-voltage distribution cabinet 4 will be disconnected.

[0084] Embodiment three:

[0085] See attached Figure 5-Figure 6, a lightning strike separation component 6 is used to drive the low-voltage distribution cabinet 4 away from the gas-insulated high-voltage power cabinet 2 and hinder current conduction when a lightning strike occurs. The lightning strike separation component 6 includes a high-distribution resistor 602, a C5F10O / Air mixed gas storage tank 603, a solenoid valve 605 and a gas guide slide pipe 607. The top of the high-distribution resistor 602 is connected to a conductor 601 through an electric wire, and the conductor 601 is fixedly installed on the inner wall of the lightning strike distribution cabinet 3 at the top in a fitting manner. The solenoid valve 605 is arranged below the C5F10O / Air mixed gas storage tank 603, and the outlet end of the C5F10O / Air mixed gas storage tank 603 is connected to the air inlet end of the solenoid valve 605 through an air pipe 604, and the outlet end of the solenoid valve 605 is connected to a multi-branch pipe 606.

[0086] See attached Figure 5-Figure 6 The air guide slide 607 is arranged between the side walls of the gas-insulated high-voltage power cabinet 2 and the low-voltage distribution cabinet 4. The ends of each branch end of the multi-branch pipe 606 are connected to the middle of the corresponding air guide slide 607. The two ends of the air guide slide 607 are symmetrically slidably assembled with pipe plugs 608, and the side walls of the pipe plugs 608 are fixedly connected with push rods 609 extending to the outside of the air guide slide 607. The ends of the push rods 609 located at the two ends are respectively connected to the outer walls of the gas-insulated high-voltage power cabinet 2 and the low-voltage distribution cabinet 4. The outer surface of the air guide slide 607 is wound with a resistance wire 610.

[0087] According to the above structure, when the power control cabinet 1 encounters direct lightning or induced lightning, the conductor 2 601 will also receive the current, and reduce the voltage through the high-voltage resistor 2 602 and trigger the solenoid valve 2 605 to work, and the C5F10O / Air mixed gas in the C5F10O / Air mixed gas storage tank 2 603 will enter the inside of each gas guide slide 607. As the gas pressure in the gas guide slide 607 increases, the pipe plugs 608 and the push rods 609 at both ends will move towards each other, and the low-voltage distribution cabinet 4 will move away from the gas along the ground rail 401. In the above process, the push rod 609 is extended from the inside of the gas-insulated high-voltage power cabinet 2 by means of the current generated by lightning strike, so that the distribution cabinet 4 is moved away from the gas-insulated high-voltage power cabinet 2, the distance between the cabinets is increased, and the current conduction phenomenon caused by mutual discharge between the cabinets is reduced. In addition, the insulating gas filled in the gas-insulated slide tube 607 and the resistance wire 610 arranged on the outer surface of the gas-insulated slide tube 607 can hinder the current conducted along the gas-insulated slide tube 607, further hinder the flow of current in the cabinet, and reduce the influence of the lightning current on the cabinet.

[0088] The working principle of the present invention is as follows: when the power control cabinet 1 encounters direct lightning or induced lightning, the conductor 601 will also receive the current, and reduce the voltage through the high-voltage resistor 602 and trigger the solenoid valve 605 to work, and the C5F10O / Air mixed gas inside the C5F10O / Air mixed gas storage tank 603 will enter the inside of each gas guide slide 607. As the air pressure inside the gas guide slide 607 increases, the pipe plugs 608 and the push rods 609 at both ends will move in opposite directions. At this time, the low-voltage distribution cabinet 4 will move along the ground rail 401 away from the gas-insulated high-voltage power cabinet 2.

[0089] Embodiment 4:

[0090] See attached Figure 7-Figure 8 , an inner lightning induction shell 7, which is used to guide the current conducted in the power control cabinet 1 to the lightning rod grounding body 8, a lightning rod 703 is rotatably installed inside the inner lightning induction shell 7, and a spring 704 for popping out the lightning rod 703 is provided at one end of the inner lightning induction shell 7 away from the transition of the lightning rod 703, the spring 704 is connected to the lightning rod grounding body 8 through a wire 709, and a shell cover 702 is symmetrically rotatably installed on the top of the inner lightning induction shell 7 through rotating arms 701 on both sides;

[0091] See attached Figure 7-Figure 8 , levers 706 are rotatably installed on both side walls of the inner lightning induction shell 7, and one end of the levers 706 on both sides close to the adapter is commonly connected to a sealing line 705, and the sealing line 705 is placed above the shell cover 702 and is used to seal the shell cover 702, and conductors 708 installed in contact with the inner wall of the power control cabinet 1 are provided on both sides of the inner lightning induction shell 7, and an electric fuse 707 is connected between two adjacent conductors 708, and the electric fuse 707 respectively passes through one end of the corresponding lever 706 away from the adapter.

[0092] According to the above structure, after receiving the current, the conductor 3 708 directly transmits it to the electric fuse 707. Since the electric fuse 707 cannot withstand the high voltage current, it will melt. After the electric fuse 707 melts, the restriction at the other end of the lever 706 is released, and the cover line 705 is loosened. Under the elastic force of the compressed spring 704, the lightning rod 703 immediately pushes out of the shell cover 702 and pops out. The lightning rod 703 placed between the cabinets can guide the current to flow to the lightning rod grounding body 8. The above process also uses the lightning current to make the originally stored lightning rod 703 pop out quickly, and guide part of the current flowing in the cabinet to the lightning rod grounding body 8, and then guide it to the earth through the lightning rod grounding body 8, thereby improving the lightning protection ability of the cabinet.

[0093] The working principle of the present invention is as follows: after receiving the current, the conductor 708 directly transmits it to the electric fuse 707. Since the electric fuse 707 cannot withstand the high voltage current, the electric fuse 707 blows. After the electric fuse 707 blows, the restriction at the other end of the lever 706 is released, and the sealing line 705 is loosened. Under the elastic force of the compressed spring 704, the lightning rod 703 immediately pushes out of the shell cover 702 and pops out. The lightning rod 703 placed between the cabinets can guide the current to flow to the lightning rod and the grounding body 8.

[0094] like Fig. 9 As shown, a method for manufacturing a power control cabinet of a multi-level lightning protection integrated system, the specific steps are as follows:

[0095] Step 1: Design phase;

[0096] Determine the functional requirements and use environment of the power cabinet, formulate the design plan of the power cabinet, draw the layout and wiring diagram of the power cabinet, and select appropriate materials and components;

[0097] Step 2: Material selection;

[0098] Generally, the materials used to make power cabinets are divided into two types: hot-rolled steel plates and cold-rolled steel plates. Cold-rolled steel plates are more suitable for making power cabinets because of their soft texture.

[0099] Step 3: Manufacturing process;

[0100] Carry out cutting, bending and other processing according to the design drawings, assemble various parts, ensure the stability of the structure and the correct position of the components, and carry out wiring and wiring according to the circuit diagram;

[0101] Step 4: Inspection and testing;

[0102] After assembly, test the various functions of the power cabinet to ensure that its performance meets the design requirements. Add a lightning simulation test to simulate the performance under direct and induced lightning to check for safety hazards such as short circuits and leakage.

[0103] Step 5: Packaging and transportation;

[0104] Properly package the completed power cabinets to prevent damage during transportation, prepare relevant shipping documents and documentation, and arrange logistics transportation.

[0105] Embodiment 1:

[0106] like Fig.10 As shown, a method for manufacturing a power control cabinet of a multi-level lightning protection integrated system, the specific steps of the lightning strike simulation detection work are as follows:

[0107] Step 1: Preparation stage;

[0108] Ensure that all test equipment and safety measures are in place, and prepare equipment to simulate lightning strikes, such as lightning current generators, and instruments for measuring parameters such as voltage, current, and temperature;

[0109] Step 2: Adjust the distance;

[0110] Adjust the distance between the low-voltage distribution cabinet 4 and the lightning rod grounding body 8 according to the standard to ensure that the air distance between the distribution cabinet and the ground wire meets the specific requirements;

[0111] Step 3: Improve grounding resistance;

[0112] Improve the area and depth of the lightning rod grounding body 8, and use chemical resistance reducing agents to improve the ground resistivity, so that the grounding resistance of the system is reduced to below 4Ω;

[0113] Step 4: Simulate lightning strike;

[0114] Use lightning current generators to simulate different types and intensities of lightning strikes, including direct lightning strikes, induction lightning strikes, etc., and use ultrasonic detection (AE), transient earth voltage detection (TEV) and ultra-high frequency detection (UHF) to detect the discharge of power cabinets;

[0115] Step 5: Analyze the results;

[0116] Analyze the data collected during the simulated lightning strike, analyze the data from different detection methods to improve the accuracy of the detection, evaluate the lightning protection performance of the power cabinet, and if any problems are found, such as component damage or abnormal data, make corresponding adjustments to the design or configuration of the power cabinet.

[0117] The working principle of the present invention is as follows: in the manufacturing process of the cabinet, an additional lightning strike simulation detection work is provided, wherein the ultrasonic detection method is very effective for detecting partial discharge inside the switch cabinet because it can capture the mechanical vibration generated by the partial discharge. This method is highly sensitive to identifying and locating the discharge source and is not affected by electromagnetic interference; the transient ground voltage detection method identifies the discharge phenomenon by measuring the high-frequency partial discharge signal on the surface of the metal cabinet. This method is simple and easy to implement and can quickly scan a large area to determine whether there is partial discharge activity. The ultra-high frequency detection method identifies the discharge phenomenon by capturing the ultra-high frequency electromagnetic waves generated by the partial discharge. It is very sensitive to tiny partial discharges and can detect partial discharges at an early stage, thereby helping to prevent potential equipment failures; in addition, the detection accuracy can be improved by comparing and analyzing the data of different detection methods. For example, by comparing the data obtained by the ultrasonic and transient ground voltage detection methods, the location of the discharge can be determined more accurately.

[0118] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A power control cabinet of a multi-level lightning protection integrated system, characterized in that: include: A power control cabinet (1), a lightning rod grounding body (8) for conducting the internal current of the power control cabinet (1) and lightning strike electricity into the earth; A gas-insulated high-voltage power cabinet (2), wherein the gas-insulated high-voltage power cabinet (2) is fixedly installed inside the power control cabinet (1), and the interior of the gas-insulated high-voltage power cabinet (2) is filled with a C5F10O / Air mixed gas; A low-voltage distribution cabinet (4), the low-voltage distribution cabinet (4) is slidably assembled on both sides of the gas-insulated high-voltage power cabinet (2); A lightning strike disconnect assembly (5) used to disconnect the electrical connection between the gas-insulated high-voltage power cabinet (2) and the low-voltage distribution cabinet (4) when a lightning strike occurs; The lightning strike disconnecting assembly (5) includes a high-distribution resistor (502), a C5F10O / Air mixed gas storage tank (503), a solenoid valve (505) and a sealed connection chamber (507). The top of the high-distribution resistor (502) is connected to a conductor (501) via an electric wire, and the conductor (501) is fixedly mounted on the inner wall of the lightning strike gas distribution cabinet (3) at the top. The solenoid valve (505) is arranged below the C5F10O / Air mixed gas storage tank (503), and the gas outlet end of the C5F10O / Air mixed gas storage tank (503) is connected to the gas inlet end of the solenoid valve (505) via an air pipe (504), and the gas outlet end of the solenoid valve (505) is connected to a multi-branch pipe (506); The sealed connection chamber (507) is arranged between the gas-insulated high-voltage power cabinet (2) and the low-voltage power distribution cabinet (4); a first power connection body (508) is fixedly installed at one end of the sealed connection chamber (507), and the first power connection body (508) is connected to the electrical equipment in the low-voltage power distribution cabinet (4) through an electric wire; a second power connection body (509) is rotatably installed at the other end of the sealed connection chamber (507), and the second power connection body (509) is connected to the power supply end in the gas-insulated high-voltage power cabinet (2) through an electric wire; the second power connection body (509) and the first power connection body (508) are detachably connected by snap-fitting; The ends of each branch of the multi-branch tube 1 (506) are connected to the corresponding sealed connection chamber (507), an air pipe (510) is integrally provided at the upper oblique position inside the sealed connection chamber (507), and an air plug (511) is slidably assembled inside the air pipe (510), and the air plug (511) is connected to the adjacent electrical connection body 2 (509) via a connecting rod (512); By means of the current generated by lightning strike, the insulating gas enters each sealed connection chamber (507), and causes the second power connection body (509) to be disconnected from the first power connection body (508), thereby urgently stopping the power supply of the low-voltage distribution cabinet (4); A lightning strike separation component (6) used to drive the low-voltage distribution cabinet (4) away from the gas-insulated high-voltage power cabinet (2) and prevent current conduction when a lightning strike occurs; With the help of the current generated by lightning strike, the current conduction phenomenon caused by mutual discharge between cabinets is reduced, and the flow of current in the cabinet is hindered; An inner lightning conductor housing (7) for conducting the current conducted in the power control cabinet (1) to the lightning rod grounding body (8); Similarly, the lightning current is utilized to cause the lightning rod (703) to pop out, and the current flowing in the cabinet is led down to the grounding body (8) by the lightning rod to the earth.

2. The power control cabinet of the multi-level lightning protection integrated system according to claim 1, characterized in that: A pressure relief cabinet (201) is provided at the bottom of the gas-insulated high-voltage power cabinet (2), and the gas-insulated high-voltage power cabinet (2) and the pressure relief cabinet (201) are connected via a pipeline equipped with a gas valve.

3. The power control cabinet of the multi-level lightning protection integrated system according to claim 2, characterized in that: Ground rails (401) are installed on both sides of the bottom of the power control cabinet (1), and inline skates for sliding assembly with the ground rails (401) are installed at the bottom of the low-voltage power distribution cabinet (4).

4. The power control cabinet of the multi-level lightning protection integrated system according to claim 3 is characterized by: The lightning strike separation component (6) comprises a second high-distribution resistor (602), a second C5F10O / Air mixed gas storage tank (603), a second solenoid valve (605) and a gas guide slide pipe (607). The top of the second high-distribution resistor (602) is connected to a second conductor (601) via an electric wire, and the second conductor (601) is fixedly mounted on the inner wall of the lightning strike gas distribution cabinet (3) at the top. The second solenoid valve (605) is arranged below the second C5F10O / Air mixed gas storage tank (603), and the gas outlet end of the second C5F10O / Air mixed gas storage tank (603) is connected to the gas inlet end of the second solenoid valve (605) via a second gas pipe (604), and the gas outlet end of the second solenoid valve (605) is connected to a second multi-branch pipe (606).

5. The power control cabinet of the multi-level lightning protection integrated system according to claim 4, characterized in that: The gas guide slide tube (607) is arranged between the side walls of the gas-insulated high-voltage power cabinet (2) and the low-voltage distribution cabinet (4); the ends of each branch end of the multi-branch pipe (606) are connected to the middle of the corresponding gas guide slide tube (607); the two ends of the gas guide slide tube (607) are symmetrically slidably assembled with pipe plugs (608); the side walls of the pipe plugs (608) are fixedly connected with push rods (609) extending to the outside of the gas guide slide tube (607); the ends of the push rods (609) located at the two ends are respectively connected to the outer walls of the gas-insulated high-voltage power cabinet (2) and the low-voltage distribution cabinet (4); and the outer surface of the gas guide slide tube (607) is wound with a resistance wire (610).

6. The power control cabinet of the multi-level lightning protection integrated system according to claim 5, characterized in that: A lightning rod (703) is rotatably mounted inside the inner lightning induction shell (7), and a spring (704) for ejecting the lightning rod (703) is provided at one end of the inner lightning induction shell (7) away from the transition point of the lightning rod (703), the spring (704) is connected to the grounding body (8) under the lightning rod through a wire (709), and a shell cover (702) is symmetrically rotatably mounted on the top of the inner lightning induction shell (7) through rotating arms (701) on both sides; Both side walls of the inner lightning induction shell (7) are rotatably mounted with levers (706), and one end of the levers (706) on both sides close to the transition point is commonly connected to a sealing line (705), and the sealing line (705) is placed above the shell cover (702) and is used to seal the shell cover (702), and both sides of the inner lightning induction shell (7) are provided with a conductor three (708) mounted in contact with the inner wall of the power control cabinet (1), and an electric fuse (707) is connected between two adjacent conductors three (708), and the electric fuse (707) respectively passes through one end of the corresponding lever (706) away from the transition point.

7. A method for manufacturing a power control cabinet of a multi-level lightning protection integrated system, used for manufacturing a power control cabinet of a multi-level lightning protection integrated system as claimed in any one of claims 1 to 6, characterized in that: The specific steps are as follows: Step 1: Design phase; Determine the functional requirements and use environment of the power cabinet, formulate the design plan of the power cabinet, draw the layout and wiring diagram of the power cabinet, and select appropriate materials and components; Step 2: Material selection; Generally, the materials used to make power cabinets are divided into two types: hot-rolled steel plates and cold-rolled steel plates. Cold-rolled steel plates are more suitable for making power cabinets because of their soft texture. Step 3: Manufacturing process; Carry out cutting and bending processing according to the design drawings, assemble various parts, ensure the stability of the structure and the correct position of the components, and carry out wiring and wiring according to the circuit diagram; Step 4: Inspection and testing; After assembly, test the various functions of the power cabinet to ensure that its performance meets the design requirements. Add a lightning simulation test to simulate the performance under direct and induced lightning to check whether there are any safety hazards. Step 5: Packaging and transportation; Properly package the completed power cabinets to prevent damage during transportation, prepare relevant shipping documents and documentation, and arrange logistics transportation.

8. The method for manufacturing a power control cabinet of a multi-level lightning protection integrated system according to claim 7, characterized in that: The specific steps of lightning strike simulation detection are as follows: Step 1: Preparation stage; Ensure that all test equipment and safety measures are in place, prepare equipment to simulate lightning strikes, and instruments to measure voltage, current, and temperature parameters; Step 2: Adjust the distance; Adjust the distance between the low-voltage distribution cabinet (4) and the lightning rod grounding body (8) according to the standard to ensure that the air distance between the distribution cabinet and the ground wire meets the specific requirements; Step 3: Improve grounding resistance; Improve the area and depth of the lightning rod grounding body (8), and use chemical resistance reducing agents to improve the ground resistivity, so that the grounding resistance of the system is reduced to below 4Ω; Step 4: Simulate lightning strike; Use lightning current generators to simulate lightning strikes of different types and intensities, and detect the discharge of power cabinets by using ultrasonic detection, transient ground voltage detection and ultra-high frequency detection methods; Step 5: Analyze the results; Analyze the data collected during the simulated lightning strike, analyze the data from different detection methods to improve the accuracy of the detection, evaluate the lightning protection performance of the power cabinet, and if any problems are found, make corresponding adjustments to the design or configuration of the power cabinet.

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