Electrified railway environment-friendly gas-insulated metal-enclosed switchgear

Abstract

The utility model discloses an environment-friendly gas-insulated metal-enclosed switchgear for an electrified railway, belongs to the technical field of gas-insulated metal-enclosed switchgears, and solves the problems that a conventional gas-insulated metal-enclosed switchgear is inconvenient to overhaul and an insulating medium is not environment-friendly. The switch cabinet comprises a switch cabinet body, two partition plates are arranged in the switch cabinet body, the interior of the switch cabinet body is sequentially divided into a bus chamber, a circuit breaker chamber and a cable chamber from top to bottom through the two partition plates, the bus chamber and the circuit breaker chamber are filled with environment-friendly gas serving as insulating media, and a three-position disconnecting switch is arranged in the bus chamber. And the three-position isolating switch is electrically connected with a grounding terminal in the bus chamber, a circuit breaker in the circuit breaker chamber and a plurality of bus sockets arranged on the top surface of the switch cabinet respectively. According to the utility model, the environment-friendly gas is used as an insulating medium, the environment protection is facilitated, and the bus socket is arranged on the top surface of the switch cabinet, so that the maintenance is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of gas-insulated metal-enclosed switchgear, in particular to an environmentally friendly gas-insulated metal-enclosed switchgear for electrified railways. Background Technique

[0002] Gas-insulated metal-enclosed switchgear is an important equipment in the traction power supply system of electrified railways and is widely used in high-speed railway traction substations, section posts, AT posts, and switching stations. Gas-insulated metal-enclosed switchgear is a metal-enclosed switchgear and control equipment in which at least a part uses a gas at a pressure higher than atmospheric pressure as the insulating medium. It generally consists of a circuit breaker, disconnector, earthing switch, instrument transformer, lightning arrester, busbar, connecting piece, and outgoing terminal, etc. These devices or components are all enclosed in a metal earthed enclosure. Currently, the insulating medium in the special 27.5kV gas-insulated switchgear for electrified railways at home and abroad all uses SF6 (sulfur hexafluoride) gas. SF6 gas has excellent insulating performance and stable physical and chemical properties and is widely used in the field of electrical equipment manufacturing. However, SF6 is a greenhouse gas. The gas-insulated metal-enclosed switchgear using SF6 will inevitably cause SF6 gas to be discharged into the atmosphere during manufacturing, failure, maintenance, and end of life. The switchgear using SF6 gas will undoubtedly exacerbate the trend of global warming. It is urgent to manufacture an environmentally friendly gas-filled switchgear that meets the performance requirements to truly achieve replaceability.

[0003] Gas-insulated switchgear is usually used in combination of multiple units to form a complete 27.5kV electrical system for facilities such as traction substations, section posts, AT posts, and switching stations. Multiple gas-insulated switchgear are arranged in rows on site. During installation, the busbars between each switchgear are electrically connected together, usually by means of side plug-in connection of the switchgear. The busbar connecting piece is embedded in the busbar connection seats on both sides of the switchgear. During installation construction, each switchgear needs to be sequentially spliced from the side to complete the busbar connection between the cabinets. If, during operation, except for the switchgear at the end in the row arrangement fails, it is necessary to sequentially move other switchgear from the side, remove the busbar connecting piece, and then the faulty switchgear can be withdrawn for maintenance or replacement. During the maintenance period, the entire traction substation, section post, AT post, and switching station need to be powered off. For the switchgear involved in removing the splicing, it is necessary to remove the high-voltage cable connection and control cable connection, with a large workload and a long power-off time for the whole station, which has a very serious impact on railway transportation. Summary of the Utility Model

[0004] In view of the above problems in the prior art, the utility model provides an environmentally friendly gas-insulated metal-enclosed switchgear for electrified railways, which solves the problems of inconvenient maintenance and non-environmentally friendly insulating medium of the existing gas-insulated metal-enclosed switchgear.

[0005] In order to achieve the above object, the technical scheme adopted by the utility model is as follows:

[0006] An environmentally friendly gas-insulated metal-enclosed switchgear for electrified railways is provided, which includes a switch cabinet. There are two partition boards inside the switch cabinet. The two partition boards divide the inside of the switch cabinet into a busbar chamber, a circuit breaker chamber, and a cable chamber from top to bottom in sequence. The busbar chamber and the circuit breaker chamber are filled with an environmentally friendly gas used as an insulating medium. A three-position disconnector is arranged in the busbar chamber, and the three-position disconnector is electrically connected to a grounding terminal located in the busbar chamber, a circuit breaker located in the circuit breaker chamber, and a plurality of busbar sockets arranged on the top surface of the switch cabinet respectively.

[0007] In this solution, the environmentally friendly gas in the busbar chamber and the circuit breaker chamber does not contain sulfur hexafluoride and any fluorinated gas, and will not emit greenhouse gases into the atmosphere, which is more environmentally friendly. At the same time, the busbar sockets are arranged on the top surface of the switch cabinet, so that adjacent environmentally friendly gas-insulated metal-enclosed switchgears can be electrically connected through the busbar sockets on the top. When a fault occurs and needs to be repaired or replaced inside a certain switch cabinet, the connection between the faulty switch cabinet and the busbars on the top of the switchgears on both sides can be disconnected, and the busbar sockets of the switchgears on both sides can be directly connected through an insulating busbar, so that the faulty switch cabinet can be quickly withdrawn and the power supply of other non-faulty switchgears can be restored. Compared with the conventional gas-insulated metal-enclosed switchgear that uses side splicing of switch cabinets to connect the busbars, this solution can greatly reduce the power outage range, power outage time, and the complexity of fault handling work of the switch cabinet, and significantly improve the power supply reliability of traction substations, section posts, AT posts, and switching stations.

[0008] Further, the environmentally friendly gas includes one or more of nitrogen, oxygen, and carbon dioxide.

[0009] Further, the circuit breaker is electrically connected to one end of a current transformer located in the circuit breaker chamber, and the other end of the current transformer is electrically connected to a voltage transformer disconnector located on the partition board of the circuit breaker chamber, a lightning arrester located in the cable chamber, and a cable respectively.

[0010] Further, the circuit breaker is a solid-sealed pole circuit breaker, and the three-position disconnector is a push-type three-position disconnector. The solid-sealed pole circuit breaker is a high-voltage electrical equipment designed using solid-sealing technology, which has the advantages of high insulation performance, small floor space, and high reliability. The push-type three-position disconnector has a high space utilization rate. Compared with other types of switches, the push-type three-position disconnector usually occupies less space and is suitable for application scenarios with limited space.

[0011] Further, a bushing is arranged at the place where the conductor connecting the three-position disconnector and the circuit breaker passes through the busbar chamber.

[0012] Further, the three-position disconnector, the circuit breaker, and the bushing are all fixedly connected to the switch cabinet through insulating parts.

[0013] Furthermore, the height of the insulating member located in the busbar chamber is less than or equal to 1 / 4 of the internal height of the busbar chamber, and the maximum outer diameter of the insulating member located in the busbar chamber is simultaneously less than or equal to 1 / 5 of the internal width and length of the busbar chamber; the height of the insulating member located in the circuit breaker chamber is less than or equal to 1 / 5 of the internal height of the circuit breaker chamber, and the maximum outer diameter of the insulating member located in the circuit breaker chamber is simultaneously less than or equal to 1 / 5 of the internal width and length of the circuit breaker chamber. Such setting of the size of the insulating member can meet the requirements of the space limitation inside the switchgear and the requirements of electrical insulation performance.

[0014] Furthermore, a plurality of creepage distance increasing skirts for increasing the creepage distance along the surface are arranged on each insulator, and a creepage groove is arranged between two adjacent creepage distance increasing skirts on each insulator. The creepage distance increasing skirts improve the insulation performance of the insulator.

[0015] Furthermore, a through-hole Hall sensor is arranged on the inner wall of the circuit breaker chamber at a position close to the circuit breaker contact. The through-hole Hall sensor is electrically connected to a controller located inside the switchgear, and the controller communicates with a wireless receiving module located inside the switchgear. The through-hole Hall sensor can collect data without affecting the normal operation of the circuit breaker itself, and feedback it to the wireless receiving module through the controller. The wireless receiving module can feedback the data to an external mobile phone or computer, facilitating the acquisition of the displacement waveform of the circuit breaker contact, the action current waveform of the trip coil, the action current waveform of the closing coil, and the current waveform of the energy storage motor.

[0016] Furthermore, a display electrically connected to the controller is arranged on the outer wall of the switchgear; a wireless temperature sensor and a wireless humidity sensor are also arranged on the inner wall of the circuit breaker chamber at a position close to the circuit breaker contact. Both the wireless temperature sensor and the wireless humidity sensor communicate with the wireless receiving module. The temperature and humidity detected by the wireless temperature sensor and the wireless humidity sensor can be displayed through the display, or communicated and sent to the outside through the wireless receiving module, facilitating personnel to master the temperature and humidity inside the switchgear.

[0017] The present utility model discloses an environmentally friendly gas-insulated metal-enclosed switchgear for electrified railways, and its beneficial effects are as follows:

[0018] 1. The utility model uses an environmental protection gas as the insulating medium, which is beneficial to environmental protection. The busbar socket is arranged on the top surface of the switchgear cabinet, so that adjacent environmentally friendly gas-insulated metal-enclosed switchgears can be electrically connected through the busbar socket on the top. When a fault occurs inside a certain switchgear cabinet and needs to be repaired or replaced, the top of the faulty switchgear cabinet and the switchgear cabinets on both sides can be disassembled, and the busbar sockets of the switchgear cabinets on both sides can be directly connected through an insulating busbar, so that the faulty switchgear cabinet can be quickly withdrawn and the power supply of other non-faulty switchgear cabinets can be restored. Compared with the conventional gas-insulated metal-enclosed switchgear that uses side splicing of switchgear cabinets to connect the busbar, this solution can greatly reduce the power outage range, power outage time and complexity of fault handling work of the switchgear cabinet, and significantly improve the power supply reliability of traction substations, section substations, AT substations and switching stations.

[0019] 2. The intelligent vacuum circuit breaker of the utility model can perform online monitoring functions such as temperature monitoring, closing and opening mechanical characteristic monitoring, closing and opening coil and energy storage motor current waveform monitoring on the circuit breaker through a through-hole Hall sensor, a controller and a wireless receiving module, so as to be able to monitor the key data during the operation of the circuit breaker in real time, continuously and comprehensively, and upload it to the dispatching center and the maintenance management center in time, so that the operation and management personnel can analyze the relevant data in time, master the operation state of the circuit breaker, and at the same time discover the potential operation defects existing in the circuit breaker in time, so as to process or repair it in time to prevent faults from occurring. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the internal structure of an environmentally friendly gas-insulated metal-enclosed switchgear;

[0021] Figure 2 It is a top view of an environmentally friendly gas-insulated metal-enclosed switchgear;

[0022] Figure 3 It is a three-dimensional view of an environmentally friendly gas-insulated metal-enclosed switchgear;

[0023] Among them: 101, cable chamber; 102, voltage transformer; 103, voltage transformer socket; 104, voltage transformer disconnector; 105, current transformer; 106, circuit breaker chamber; 107, insulator; 108, busbar chamber; 109, three-position disconnector; 110, busbar; 111, busbar socket; 112, bushing; 113, circuit breaker; 114, connection socket; 115, lightning arrester; 116, cable. Detailed Embodiment

[0024] The specific embodiments of the present utility model will be described below to facilitate those skilled in the art of this technology to understand the present utility model. However, it should be clear that the present utility model is not limited to the scope of the specific embodiments. For those of ordinary skill in the art of this technology, as long as various changes are within the spirit and scope of the present utility model defined and determined by the appended claims, these changes are obvious, and all utility models created using the concept of the present utility model are within the scope of protection.

[0025] Referring Figures 1 to 3 , this embodiment provides an environmentally friendly gas-insulated metal-enclosed switchgear for electrified railways, including a switch cabinet. There are two partition boards inside the switch cabinet, and the two partition boards divide the inside of the switch cabinet into a busbar chamber 108, a circuit breaker chamber 106, and a cable chamber 101 from top to bottom in sequence.

[0026] The busbar chamber 108 and the circuit breaker chamber 106 are filled with an environmentally friendly gas used as an insulating medium. The environmentally friendly gas includes one or more of nitrogen, oxygen, and carbon dioxide. The environmentally friendly gas does not contain sulfur hexafluoride and any fluorinated gas and will not emit greenhouse gases into the atmosphere, being more environmentally friendly.

[0027] A three-position disconnector 109 is arranged in the busbar chamber 108. The three-position disconnector 109 is electrically connected to a grounding terminal located in the busbar chamber 108, a circuit breaker 113 located in the circuit breaker chamber 106, and a plurality of busbar sockets 111 arranged on the top surface of the switch cabinet respectively. An insulator 107 is arranged at the bottom of the grounding terminal. The three-position disconnector 109 is electrically connected to the plurality of busbar sockets 111 through a plurality of busbars 110.

[0028] In this embodiment, the environmentally friendly gas in the busbar chamber 108 and the circuit breaker chamber 106 also arranges the busbar sockets 111 on the top surface of the switch cabinet, so that adjacent environmentally friendly gas-insulated metal-enclosed switchgears can be electrically connected through the busbar sockets 111 on the top. When a fault occurs and is repaired or replaced inside a certain switch cabinet, the top busbar connection between the faulty switch cabinet and the switch cabinets on both sides can be disassembled, and the busbar sockets 111 of the switch cabinets on both sides can be directly connected through an insulating busbar, so that the faulty switch cabinet can be quickly withdrawn and the power supply of other non-faulty switch cabinets can be restored. Compared with the conventional gas-insulated metal-enclosed switchgear that uses side splicing of switch cabinets to connect busbars, this solution can greatly reduce the switch cabinet fault power outage range, fault power outage time, and the complexity of fault handling work, and significantly improve the power supply reliability of traction substations, section posts, AT posts, and switching stations.

[0029] As a further solution of this embodiment, the circuit breaker 113 is electrically connected to one end of the current transformer 105 located in the circuit breaker compartment 106, and the other end of the current transformer 105 is electrically connected to the potential transformer disconnect switch 104 and three connection sockets 114 located on the partition of the circuit breaker compartment 106 respectively; the potential transformer disconnect switch 104 is electrically connected to the potential transformer 102 located in the cable compartment 101 through the potential transformer socket 103, and the three connection sockets 114 are electrically connected to two cables 116 and a lightning arrester 115 located in the cable compartment 101 respectively.

[0030] Preferably, the circuit breaker 113 is a solid-sealed pole circuit breaker, and the three-position disconnect switch 109 is a push-type three-position disconnect switch. The solid-sealed pole circuit breaker 113 is a high-voltage electrical equipment designed using solid-sealing technology, which has the advantages of high insulation performance, small floor space, and high reliability. The push-type three-position disconnect switch 109 has a high space utilization rate. Compared with other types of switches, the push-type three-position disconnect switch 109 usually occupies less space and is suitable for application scenarios with limited space.

[0031] As a further solution of this embodiment, a bushing 112 is provided at the place where the conductor connecting the three-position disconnect switch 109 and the circuit breaker 113 passes through the bus compartment 108. The three-position disconnect switch 109, the circuit breaker 113, and the bushing 112 are fixedly connected to the switchgear through insulating parts.

[0032] As a further solution of this embodiment, the height of the insulating part located in the bus compartment 108 is less than or equal to 1 / 4 of the internal height of the bus compartment 108, and the maximum outer diameter of the insulating part located in the bus compartment 108 is simultaneously less than or equal to 1 / 5 of the internal width and length of the bus compartment 108; the height of the insulating part located in the circuit breaker compartment 106 is less than or equal to 1 / 5 of the internal height of the circuit breaker compartment 106, and the maximum outer diameter of the insulating part located in the circuit breaker compartment 106 is simultaneously less than or equal to 1 / 5 of the internal width and length of the circuit breaker compartment 106. Preferably, the thickness of each insulating part is greater than or equal to 25 mm and less than or equal to 40 mm; the insulation field strength on the surface of the insulating part is less than or equal to 1.2 kV / mm;

[0033] Setting the dimensions of the insulating parts in this way can meet the requirements of the space limitation inside the switchgear and the requirements of electrical insulation performance.

[0034] As a further solution of this embodiment, multiple creepage distance increasing skirts for increasing the creepage distance along the surface are provided on each insulator, and a creepage groove is provided between two adjacent creepage distance increasing skirts on each insulator. The creepage distance increasing skirts improve the insulation performance of the insulator.

[0035] As a further solution of this embodiment, a through-hole Hall sensor is provided on the inner wall of the circuit breaker chamber 106 near the contact of the circuit breaker 113. The through-hole Hall sensor is electrically connected to a controller located inside the switch cabinet, and the controller communicates with a wireless receiving module located inside the switch cabinet. The through-hole Hall sensor can collect data without affecting the normal operation of the circuit breaker 113 itself, and feedback it to the wireless receiving module communication through the controller. The wireless receiving module communication can feedback the data to an external mobile phone or computer, facilitating the acquisition of the displacement waveform of the contact of the circuit breaker 113, the operating current waveform of the tripping coil, the operating current waveform of the closing coil, and the current waveform of the energy storage motor. The controller is a single-chip microcomputer or a PLC, and the wireless receiving module can be a Bluetooth or WiFi module.

[0036] A display electrically connected to the controller is provided on the outer wall of the switch cabinet; a wireless temperature sensor and a wireless humidity sensor are also provided on the inner wall of the circuit breaker chamber 106 near the contact of the circuit breaker 113. Both the wireless temperature sensor and the wireless humidity sensor communicate with the wireless receiving module. The display is equipped with an RS485 interface and uses the standard MODBUS-RTU communication protocol to upload sampling data and various alarm messages, and supports external U disk for exporting waveform data.

[0037] The temperature and humidity detected by the wireless temperature sensor and the wireless humidity sensor can be displayed on the display or communicated to the outside world through the wireless receiving module, facilitating personnel to master the temperature and humidity inside the switch cabinet. In this embodiment, the through-hole Hall sensor, the controller, the wireless temperature sensor, and the wireless humidity sensor are all existing technologies. Since they are existing technologies, the specific working principles and connection relationships thereof will not be elaborated in this embodiment.

[0038] This solution enables intelligent vacuum circuit breaker 113 with online monitoring functions such as temperature monitoring, opening and closing mechanical characteristic monitoring, opening and closing coil and energy storage motor current waveform monitoring of the circuit breaker 113 through a through-hole Hall sensor, a controller, and a wireless receiving module. Thus, it can monitor the key data during the operation of the circuit breaker 113 in real-time, continuously, and comprehensively, and upload it to the dispatching center and the maintenance management center in a timely manner, enabling operation and management personnel to analyze the relevant data in a timely manner, master the operation status of the circuit breaker 113, and at the same time promptly discover potential operation defects existing in the circuit breaker 113, so as to handle or repair them in a timely manner and prevent faults from occurring.

[0039] Although the specific implementation manners of the utility model have been described in detail in conjunction with the accompanying drawings, it should not be construed as a limitation on the protection scope of this patent. Within the scope described in the claims, various modifications and deformations that can be made by those skilled in the art without creative labor still fall within the protection scope of this patent.

Claims

1. An environmentally friendly gas-insulated metal-enclosed switchgear for electrified railways, characterized in that: The invention comprises a switch cabinet, wherein two partitions are arranged inside the switch cabinet, and the two partitions divide the inside of the switch cabinet into a busbar chamber (108), a circuit breaker chamber (106) and a cable chamber (101) from top to bottom in sequence; the busbar chamber (108) and the circuit breaker chamber (106) are filled with environmentally friendly gas used as an insulating medium; a three-position disconnector (109) is arranged in the busbar chamber (108); the three-position disconnector (109) is electrically connected to a grounding terminal located in the busbar chamber (108), a circuit breaker (113) located in the circuit breaker chamber (106), and a plurality of busbar sockets (111) arranged on the top surface of the switch cabinet.

2. The environmentally friendly gas-insulated metal-enclosed switchgear for electrified railway according to claim 1, characterized in that: The environmentally friendly gas includes one or more of nitrogen, oxygen and carbon dioxide.

3. The environmentally friendly gas-insulated metal-enclosed switchgear for electrified railway according to claim 1, characterized in that: The circuit breaker (113) is electrically connected to one end of a current transformer (105) located in the circuit breaker chamber (106), and the other end of the current transformer (105) is electrically connected to a voltage transformer isolating switch (104) located on a partition of the circuit breaker chamber (106), a lightning arrester (115) located in the cable chamber (101), and a cable (116).

4. The environmentally friendly gas-insulated metal-enclosed switchgear for electrified railway according to claim 3, characterized in that: The circuit breaker (113) is a sealed pole circuit breaker, and the three-position disconnector (109) is a push-type three-position disconnector.

5. The environmentally friendly gas-insulated metal-enclosed switchgear for electrified railway according to claim 3, characterized in that: A bushing (112) is provided at the conductor connecting the three-position disconnector (109) and the circuit breaker (113) where the conductor passes through the busbar chamber (108).

6. The environmentally friendly gas-insulated metal-enclosed switchgear for electrified railway according to claim 5, characterized in that: The three-position isolating switch (109), the circuit breaker (113) and the bushing (112) are all fixedly connected to the switch cabinet via insulating parts.

7. The environmentally friendly gas-insulated metal-enclosed switchgear for electrified railway according to claim 5, characterized in that: The height of the insulating member located in the busbar chamber (108) is less than or equal to 1 / 4 of the internal height of the busbar chamber (108), and the maximum outer diameter of the insulating member located in the busbar chamber (108) is less than or equal to 1 / 5 of the internal width and length of the busbar chamber (108); The height of the insulating member in the circuit breaker chamber (106) is less than or equal to 1 / 5 of the internal height of the circuit breaker chamber (106), and the maximum outer diameter of the insulating member in the circuit breaker chamber (106) is less than or equal to 1 / 5 of the internal width and length of the circuit breaker chamber (106).

8. The environmentally friendly gas-insulated metal-enclosed switchgear for electrified railway according to claim 5, characterized in that: A plurality of creepage increasing skirts for increasing the surface creepage distance are arranged on each insulator, and a creepage increasing groove is arranged between two adjacent creepage increasing skirts on each insulator.

9. The environmentally friendly gas-insulated metal-enclosed switchgear for electrified railway according to claim 3, characterized in that: A through-hole Hall sensor is provided on the inner wall of the circuit breaker chamber (106) at a position close to the contacts of the circuit breaker (113); the through-hole Hall sensor is electrically connected to a controller located in the switch cabinet; and the controller communicates with a wireless receiving module located in the switch cabinet.

10. The environmentally friendly gas-insulated metal-enclosed switchgear for electrified railway according to claim 9, characterized in that: A display electrically connected to the controller is arranged on the outer wall of the switch cabinet; a wireless temperature sensor and a wireless humidity sensor are also arranged on the inner wall of the circuit breaker chamber (106) at a position close to the contacts of the circuit breaker (113), and both the wireless temperature sensor and the wireless humidity sensor communicate with the wireless receiving module.

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