Ring main unit

Abstract

The utility model provides a ring main unit. The ring main unit comprises a cabinet body and a switch chamber. The switch chamber is arranged in the cabinet body. The switch chamber comprises a wire inlet sleeve, a circuit breaker, a three-position switch and a wire outlet sleeve. The circuit breaker comprises a moving end transmission member, a vacuum arc-extinguishing chamber, an isolation static contact and a conductive seat. The conductive seat is provided with a first end face and a second end face which are opposite to each other, the moving end transmission part is electrically connected with the wire inlet sleeve and one end face of the vacuum arc-extinguishing chamber, the other end face of the vacuum arc-extinguishing chamber is electrically connected with the first end face of the conductive seat, and the second end face of the conductive seat is electrically connected with the end face of the isolation static contact. The end, away from the conductive base, of the isolation static contact is electrically connected with the three-position switch, and the three-position switch is electrically connected with the wire outlet sleeve. The static end of the vacuum arc-extinguishing chamber of the ring main unit and the isolation static contact are more stable and reliable in conduction.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a ring main unit. Background Art

[0002] In the power supply network system, to improve the power supply reliability, the power supply network is usually connected in a ring shape so that users can obtain power from two directions. This power supply method is abbreviated as ring network power supply. The ring main unit is the core switching equipment in the ring network power supply equipment. In the circuit breaker of the ring main unit, one end of the vacuum interrupter is electrically connected to the isolating static contact by a copper nut. When energized, the current is conducted to the isolating static contact through the thread of the copper nut. There is a concave structure between each thread, making the contact surface between the thread and the isolating static contact uneven, thus making it easy for the thread and the isolating static contact to have poor contact, affecting the electrical conductivity stability and reliability between the static end of the vacuum interrupter and the isolating static contact. Summary of the Invention

[0003] One object of the utility model is to solve the technical problem that the electrical conductivity between the vacuum interrupter and the isolating static contact in the ring main unit is prone to be unreliable in the prior art.

[0004] To solve the above technical problem, the utility model adopts the following technical scheme:

[0005] A ring main unit, comprising:

[0006] A cabinet body;

[0007] A switch room, which is arranged in the cabinet body and includes an incoming line bushing, a circuit breaker, a three-position switch and an outgoing line bushing;

[0008] Wherein, the circuit breaker includes a moving end transmission part, a vacuum interrupter, an isolating static contact and a conductive seat. The conductive seat has opposite first and second end faces. The moving end transmission part is electrically connected to one end face of the incoming line bushing and the vacuum interrupter respectively. The other end face of the vacuum interrupter is electrically connected to the first end face of the conductive seat. The second end face of the conductive seat is electrically connected to the end face of the isolating static contact. One end of the isolating static contact far from the conductive seat is electrically connected to the three-position switch, and the three-position switch is electrically connected to the outgoing line bushing.

[0009] In one embodiment, the ring main unit includes a first support insulating plate, a second support insulating plate and a fixing plate. The first support insulating plate and the second support insulating plate are arranged oppositely. One end of the fixing plate is connected to the first support insulating plate, and the other end is connected to the second support insulating plate. The circuit breaker is respectively connected to the first support insulating plate, the second support insulating plate and the fixing plate. The conductive seat penetrates through the fixing plate.

[0010] In one embodiment, the ring main unit further includes an adjusting member for adjusting the distance between the conductive seat and the fixing plate, so as to form an installation space therebetween for installing a conductive gasket.

[0011] In one embodiment, the fixing plate is provided with a first through hole, and the side of the conductive seat facing the fixing plate is provided with a mounting hole. The adjusting member passes through the first through hole and is installed in the mounting hole.

[0012] In one embodiment, the adjusting member is a threaded member, the first through hole is a first threaded hole adapted to the threaded member, the mounting hole is a second threaded hole adapted to the threaded member, and the threaded member is in threaded cooperation with the first threaded hole and the second threaded hole respectively.

[0013] In one embodiment, the circuit breaker and the corresponding three-position switch are on the same plane.

[0014] In one embodiment, the ring main unit further includes a support frame and an air tank. The support frame is arranged in the air tank, and the air tank is filled with dry air. Both the circuit breaker and the three-position switch are fixedly arranged on the installation plane of the support frame.

[0015] In one embodiment, the ring main unit further includes a mechanism chamber arranged in the cabinet body. A first operating mechanism is arranged in the mechanism chamber and is connected to the circuit breaker for operating the closing or opening of the circuit breaker.

[0016] In one embodiment, a second operating mechanism is arranged in the mechanism chamber and is connected to the three-position switch for operating the closing, opening or isolation of the three-position switch.

[0017] In one embodiment, the ring main unit further includes a cable chamber and an explosion-proof sheet. The cable chamber is arranged in the cabinet body, adjacent to the switch chamber, and the cable chamber is provided with a through hole communicating with the switch chamber, and the explosion-proof sheet seals the through hole.

[0018] It can be seen from the above technical solutions that the present utility model has at least the following advantages and positive effects:

[0019] In the present utility model, an incoming line bushing, a circuit breaker, a three-position switch, and an outgoing line bushing form a conductive loop. The other end face of the vacuum interrupter is electrically connected to the first end face of the conductive base. The second end face of the conductive base is electrically connected to the end face of the isolating static contact. When powered on, the current of the vacuum interrupter can be conducted to the isolating static contact through the first end face and the first end face of the conductive base. The end face of the vacuum interrupter contacts and conducts electricity with the first end face of the conductive base, and the contact surface between the two is stable, and the contact area between the conductive base and the vacuum interrupter can be increased, so that the vacuum interrupter and the conductive base can conduct electricity stably. The second end face of the conductive base contacts and conducts electricity with the end face of the isolating static contact, and the contact surface between the two is stable, and the contact area between the conductive base and the isolating static contact can be increased, so that the isolating static contact and the conductive base can conduct electricity stably. Compared with the screw-thread conduction in the related art, the conduction between the static end of the vacuum interrupter and the isolating static contact of this ring main unit is more stable and reliable. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a ring main unit in an embodiment of the present utility model.

[0021] Figure 2 is a schematic structural diagram inside the gas tank in an embodiment of the present utility model.

[0022] Figure 3 is a schematic structural diagram of the circuit breaker in an embodiment of the present utility model.

[0023] Figure 4 is a perspective view of the circuit breaker in an embodiment of the present utility model.

[0024] Figure 5 is a schematic structural diagram of the circuit breaker and the three-position switch in the same plane in an embodiment of the present utility model.

[0025] The description of the reference numerals is as follows:

[0026] 100, cabinet body;

[0027] 200, switch room; 210, gas tank; 220, incoming line bushing; 230, circuit breaker; 231, moving end transmission part; 232, vacuum interrupter; 233, isolating static contact; 234, conductive base; 240, three-position switch; 250, outgoing line bushing; 260, flexible joint; 270, copper bar; 281, first support insulating plate; 282, second support insulating plate; 283, fixing plate; 284, adjusting part; 290, support frame;

[0028] 300, mechanism room; 310, first operating mechanism; 320, second operating mechanism;

[0029] 400, cable room;

[0030] 500, low-voltage room. Detailed implementation manners

[0031] Typical implementation manners reflecting the features and advantages of the present utility model will be described in detail in the following description. It should be understood that the present utility model can have various variations in different implementation manners, all of which do not depart from the scope of the present utility model, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting the present utility model.

[0032] In the description of this application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to this application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of this application, "a plurality" means two or more unless otherwise specifically defined.

[0033] In one embodiment, a ring main unit is applied to a 24 kV switchgear. As Figure 1 shown, the ring main unit includes a cabinet body 100. The cabinet body 100 is a square cabinet body 100. The cabinet body 100 forms the outer shell of the ring main unit.

[0034] Please refer to Figure 2 together. The ring main unit further includes a switch room 200. The switch room 200 is arranged inside the cabinet body 100. The switch room 200 includes an air tank 210, an incoming line bushing 220, a circuit breaker 230, a three-position switch 240, and an outgoing line bushing 250. The inside of the air tank 210 is a closed accommodation cavity. The incoming line bushing 220, the circuit breaker 230, the three-position switch 240, and the outgoing line bushing 250 are all fixed inside the air tank 210.

[0035] Specifically, the material of the air tank 210 can be stainless steel. The air tank 210 can be welded by a welding robot, so that the welds of the air tank 210 are uniform, thereby improving the accuracy, strength, and airtightness of the air tank 210.

[0036] In related technologies, the gas box in the ring main unit is usually insulated with sulfur hexafluoride gas. Sulfur hexafluoride gas is a greenhouse gas that will exacerbate the global greenhouse effect and cause the global temperature to rise. Moreover, sulfur hexafluoride gas will decompose into toxic harmful gases under the action of high-temperature electric arcs, which will pollute the environment.

[0037] In this embodiment, the gas box 210 is filled with dry air. Dry air is used as the insulating medium in the gas box 210. Compared with sulfur hexafluoride gas, dry air can avoid exacerbating the greenhouse effect and reduce the decomposition into toxic harmful gases under the action of high-temperature electric arcs, effectively reducing environmental pollution.

[0038] In one embodiment, the ring main unit further includes a mechanism chamber 300. The mechanism chamber 300 is arranged inside the cabinet body 100. As Figure 1 shown, the mechanism chamber 300 can be adjacent to the switch chamber 200. The mechanism chamber 300 can be located on the right side of the switch chamber 200, which is convenient for operating the circuit breaker 230 and the three-position switch 240 in the switch chamber 200.

[0039] Specifically, a first operating mechanism 310 is arranged inside the mechanism chamber 300. The first operating mechanism 310 is connected to the circuit breaker 230. The first operating mechanism 310 is used to operate the closing or opening of the circuit breaker 230.

[0040] More specifically, a first dynamic sealing shaft is further arranged inside the mechanism chamber 300. The first dynamic sealing shaft is respectively connected to the first operating mechanism 310 and the circuit breaker 230. When the first operating mechanism 310 rotates, it drives the first dynamic sealing shaft to rotate, so that the first dynamic sealing shaft drives the circuit breaker 230 to close and open. The circuit breaker 230 is arranged inside the sealed gas box 210. Through the first dynamic sealing shaft, the circuit breaker 230 can be operated to close and open in the mechanism chamber 300 without affecting the airtightness of the gas box 210.

[0041] In one embodiment. A second operating mechanism 320 is arranged inside the mechanism chamber 300. The second operating mechanism 320 is connected to the three-position switch 240. The second operating mechanism 320 is used to operate the closing, opening or isolation of the three-position switch 240.

[0042] Specifically, a second dynamic sealing shaft is further arranged inside the mechanism chamber 300. The second dynamic sealing shaft is respectively connected to the second operating mechanism 320 and the three-position switch 240. When the second operating mechanism 320 rotates, it drives the second dynamic sealing shaft to rotate, so that the second dynamic sealing shaft drives the three-position switch 240 to close, open or isolate. The three-position switch 240 is arranged inside the sealed gas box 210. Through the second dynamic sealing shaft, the three-position switch 240 can be operated to close, open or isolate in the mechanism chamber 300 without affecting the airtightness of the gas box 210.

[0043] In one embodiment, the ring main unit further includes an interlocking mechanism. The interlocking mechanism is respectively connected to the first operating mechanism 310 and the second operating mechanism 320.

[0044] When the first operating mechanism 310 is in the position corresponding to the open state, the ring main unit is in a power-off state. At this time, there is no risk of electric shock when operating the second operating mechanism 320, and the interlocking mechanism can leave the locking position of the second operating mechanism 320, so that the operation of the second operating mechanism 320 is not affected.

[0045] When the first operating mechanism 310 is in the position corresponding to the closed state, the ring main unit is in a powered-on state. The interlocking component moves to the position of locking the second operating mechanism 320, restricting the rotation of the second operating mechanism 320, and avoiding operating the second operating mechanism 320 under the powered-on condition, effectively improving the safety of the ring main unit.

[0046] In one embodiment, the ring main unit further includes a cable chamber 400. The cable chamber 400 is arranged inside the cabinet body 100. The cable chamber 400 is adjacent to the switch chamber 200. As Figure 1 shown, the cable chamber 400 is located below the switch chamber 200 and the switch chamber 200. The cable chamber 400 is used to arrange the cables connected to the inside of the switch chamber 200.

[0047] Specifically, the ring main unit further includes an explosion-proof sheet. The cable chamber 400 is provided with a through hole communicating with the switch chamber 200. The explosion-proof sheet seals and covers the through hole. When the air pressure in the gas box 210 in the switch chamber 200 is too high, the explosion-proof sheet is blown open, and the gas in the gas box 210 flows into the cable chamber 400 to relieve the pressure of the gas box 210 to ensure the safety of the gas box 210.

[0048] In one embodiment, the ring main unit further includes a low-voltage chamber 500. The low-voltage chamber 500 is arranged inside the cabinet body 100. The low-voltage chamber 500 is adjacent to the mechanism chamber 300. The low-voltage chamber 500 can be located above the mechanism chamber 300. The operator can operate the first operating mechanism 310 and the second operating mechanism 320 in the operation chamber through the low-voltage chamber 500.

[0049] In one embodiment, the incoming line bushing 220, the circuit breaker 230, the three-position switch 240 and the outgoing line bushing 250 form a closed conductive loop. The upper end of the circuit breaker 230 is connected to the incoming line bushing 220 through a flexible joint 260. The lower end of the circuit breaker 230 is connected to the outgoing line bushing 250 through a copper bar 270.

[0050] Among them, the circuit breaker 230 includes a moving-end transmission member 231, a vacuum interrupter 232, an isolating static contact 233, and a conductive base 234. The conductive base 234 has opposite first and second end faces. The moving-end transmission member 231 is electrically connected to the incoming line bushing 220 and one end of the vacuum interrupter 232 respectively. The other end of the vacuum interrupter 232 is electrically connected to the first end face of the conductive base 234. The second end face of the conductive base 234 is electrically connected to the isolating static contact 233. One end of the isolating static contact 233 away from the conductive base 234 is electrically connected to the three-position switch 240. The three-position switch 240 is electrically connected to the outgoing line bushing 250.

[0051] When powered on, the current of the vacuum interrupter 232 can be conducted to the isolating static contact 233 through the first end face and the first end face of the conductive base 234. The end face of the vacuum interrupter 232 contacts and conducts electricity with the first end face of the conductive base 234, and the contact surface between the two is stable, and the contact area between the conductive base 234 and the vacuum interrupter 232 can be increased, so that the vacuum interrupter 232 and the conductive base 234 can conduct electricity stably. The second end face of the conductive base 234 contacts and conducts electricity with the end face of the isolating static contact 233, and the contact surface between the two is stable, and the contact area between the conductive base 234 and the isolating static contact 233 can be increased, so that the isolating static contact 233 and the conductive base 234 can conduct electricity stably. Compared with the screw-thread conduction in the related art, the conduction between the static end of the vacuum interrupter 232 and the isolating static contact 233 of this ring main unit is more stable and reliable.

[0052] In one embodiment, the three-position switch 240 includes three isolating knife assemblies, and each vacuum interrupter 232 corresponds to one isolating knife assembly, and arc extinguishing can be performed in the gas tank 210 through the vacuum interrupter 232, avoiding the electrolysis of the insulating medium by high-temperature electric arcs and improving the reliability of the insulating ring main unit.

[0053] In one embodiment, please refer to Figure 3 and Figure 4 , the ring main unit includes a first support insulating plate 281, a second support insulating plate 282, and a fixing plate 283. The first support insulating plate 281 and the second support insulating plate 282 are both fixed to the inner side wall of the gas tank 210. The circuit breaker 230 is connected to the first support insulating plate 281, the second support insulating plate 282, and the fixing plate 283 respectively. The first support insulating plate 281 and the second support insulating plate 282 are arranged oppositely, so as to form an installation space between the first support insulating plate 281 and the second support insulating plate 282.

[0054] Specifically, one end of the fixing plate 283 is connected to the first support insulating plate 281, and the other end is connected to the second support insulating plate 282. It can be understood that the fixing plate 283 is fixedly connected between the first support insulating plate 281 and the second support insulating plate 282.

[0055] In the related art, the vacuum interrupter 232 is electrically connected to the isolating static contact 233 through a copper nut. The copper nut is prone to looseness under the action of external force, affecting the conductivity between the static end of the vacuum interrupter 232 and the isolating static contact 233.

[0056] In this embodiment, please refer to Figure 3 and Figure 4 . The conductive seat 234 passes through the fixing plate 283. The conductive seat 234 can be fixed to the fixing plate 283 to improve the stability of the conductive seat 234, thereby improving the conductive stability between the static end of the vacuum interrupter 232 and the isolating static contact 233.

[0057] Specifically, the conductive seat 234 is divided into a first part and a second part by the fixing plate 283. The first part is located at the upper end of the fixing plate 283. The first part is electrically connected to the end face of the vacuum interrupter 232. The second part penetrates through the fixing plate 283 and extends downward in a direction away from the first part. The second part is electrically connected to the end face of the isolating static contact 233. The first end face of the conductive seat 234 is the upper end face of the first part. The second end face of the conductive seat 234 is the lower end face of the second part. Specifically, the first part and the second part can be cylindrical. The diameter of the first part is greater than the diameter of the second part.

[0058] In one embodiment, the ring main unit further includes an adjusting member 284. The adjusting member 284 is used to adjust the distance between the conductive seat 234 and the fixing plate 283 so as to form an installation space between the conductive seat 234 and the fixing plate 283. The installation space is used to install a conductive gasket, thereby adjusting the overtravel. This method of adjusting the overtravel is more convenient and simple, with less workload.

[0059] Specifically, the adjusting member 284 specifically adjusts the distance between the first part of the conductive seat 234 and the fixing plate 283. The adjusting member 284 can drive the first part of the conductive seat 234 to move in a direction away from the fixing plate 283, such as Figure 3 the vertically upward direction in Figure 3 to increase the distance between the first part and the fixing plate 283. The adjusting member 284 can drive the first part of the conductive seat 234 to move in a direction close to the fixing plate 283, such as

[0060] Specifically, the fixing plate 283 is provided with a first through hole. The side of the conductive base 234 facing the fixing plate 283 is provided with a mounting hole. The mounting hole is specifically arranged in the first part of the conductive base 234. The adjusting member 284 is inserted through the first through hole and installed in the mounting hole. The adjusting member 284 is used to adjust the distance between the conductive base 234 and the fixing plate 283. The adjusting member 284 cooperates with the first through hole and the mounting hole respectively, and can stably adjust the distance between the conductive base 234 and the fixing plate 283.

[0061] More specifically, multiple adjusting members 284, first through holes and mounting holes can be provided. The multiple adjusting members 284, multiple first through holes and multiple mounting holes are arranged in one-to-one correspondence.

[0062] In one embodiment, the adjusting member 284 is a threaded member. The first through hole is a first threaded hole adapted to the threaded member. The mounting hole is a second threaded hole adapted to the threaded member. The threaded member is threadedly engaged with the first threaded hole and the second threaded hole respectively. The threaded member passes through the conductive base 234 through the first threaded hole and is threadedly engaged with the second threaded hole to fix the conductive base 234 and the fixing plate 283. When it is necessary to adjust the overtravel, the threaded member can be rotated so that the first threaded hole in the conductive base 234 is threadedly engaged with the threaded member, driving the conductive base 234 to move relative to the fixing plate 283.

[0063] Specifically, four threaded members, first threaded holes and second threaded holes are provided. The four threaded members, four first threaded holes and four second threaded holes are arranged in one-to-one correspondence. The four threaded members are respectively arranged on the outer periphery of the conductive base 234 to further enhance the stability between the conductive base 234 and the fixing plate 283. The threaded member can be a screw.

[0064] In one embodiment, as Figure 5 shown, the circuit breaker 230 and the corresponding three-position switch 240 are on the same plane. Compared with the circuit breaker 230 and the corresponding three-position switch 240 being on different planes, this setting can reduce the insulation distance between the circuit breaker 230 and the three-position switch 240, improve the insulation performance of the ring main unit, and can reduce the size of the entire ring main unit.

[0065] Specifically, the vacuum interrupter 232 and the isolating static contact 233 are on the same plane.

[0066] More specifically, the ring main unit further includes a support frame 290. The circuit breaker 230 and the three-position switch 240 are both fixedly arranged on the installation plane of the support frame 290 so that the circuit breaker 230 and the three-position switch 240 are on the same plane.

[0067] While the present utility model has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present utility model can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be broadly construed within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A ring main unit, characterized in that, Comprising: Cabinet body; Switch room, the switch room is arranged in the cabinet body, and the switch room includes an incoming line bushing, a circuit breaker, a three-position switch and an outgoing line bushing; Wherein, the circuit breaker includes a moving end transmission member, a vacuum arc extinguishing chamber, an isolating static contact and a conductive base. The conductive base has opposite first and second end faces. The moving end transmission member is electrically connected to the incoming line bushing and one end face of the vacuum arc extinguishing chamber respectively. The other end face of the vacuum arc extinguishing chamber is electrically connected to the first end face of the conductive base. The second end face of the conductive base is electrically connected to the end face of the isolating static contact. The end of the isolating static contact away from the conductive base is electrically connected to the three-position switch, and the three-position switch is electrically connected to the outgoing line bushing.

2. The ring main unit according to claim 1, characterized in that, The ring main unit includes a first support insulating plate, a second support insulating plate and a fixing plate. The first support insulating plate and the second support insulating plate are arranged oppositely. One end of the fixing plate is connected to the first support insulating plate, and the other end is connected to the second support insulating plate. The circuit breaker is respectively connected to the first support insulating plate, the second support insulating plate and the fixing plate, and the conductive base passes through the fixing plate.

3. The ring main unit according to claim 2, wherein, The ring main unit further includes an adjusting member for adjusting the distance between the conductive base and the fixing plate so as to form an installation space between the conductive base and the fixing plate for installing a conductive gasket.

4. The ring main unit according to claim 3, characterized in that, The fixing plate is provided with a first through hole, and the side of the conductive base facing the fixing plate is provided with a mounting hole. The adjusting member passes through the first through hole and is installed in the mounting hole.

5. The ring main unit according to claim 4, wherein The adjusting member is a threaded member. The first through hole is a first threaded hole adapted to the threaded member, and the mounting hole is a second threaded hole adapted to the threaded member. The threaded member is threadedly engaged with the first threaded hole and the second threaded hole respectively.

6. The ring main unit according to claim 1, characterized in that The circuit breaker and the corresponding three-position switch are on the same plane.

7. The ring main unit according to claim 6, wherein, The ring main unit further includes a support frame and an air box. The support frame is arranged in the air box, and the air box is used to fill dry air. The circuit breaker and the three-position switch are both fixedly arranged on the mounting plane of the support frame.

8. The ring main unit according to claim 1, characterized in that, The ring main unit further includes a mechanism room arranged in the cabinet body. A first operating mechanism is arranged in the mechanism room and is connected to the circuit breaker. The first operating mechanism is used to operate the closing or opening of the circuit breaker.

9. The ring main unit according to claim 8, characterized in that, A second operating mechanism is arranged in the mechanism room and is connected to the three-position switch. The second operating mechanism is used to operate the closing, opening or isolation of the three-position switch.

10. The ring main unit according to claim 1, characterized in that, The ring main unit further includes a cable chamber and an explosion-proof sheet. The cable chamber is arranged in the cabinet body, adjacent to the switch room, and the cable chamber is provided with a through hole communicating with the switch room, and the explosion-proof sheet seals the through hole.

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