Double-isolation switch structure of switch cabinet

Abstract

The utility model relates to a double-isolation switch structure of a switch cabinet, which comprises a cabinet body, the front side of a bus chamber is provided with a circuit breaker and an isolation switch control device, and the bus chamber is provided with a bus bar, an upper isolation switch, an upper branch bus bar and a mutual inductor branch bar which are electrically connected in sequence from top to bottom. The cable chamber is provided with a lower branch bus, a lower isolation switch and a lower outgoing line busbar which are electrically connected in sequence from top to bottom, a current transformer is arranged between the transformer branch busbar and the lower branch bus, the upper isolation switch controller is connected with and controls the upper isolation switch, and the lower isolation switch controller is connected with and controls the lower isolation switch. By adding the lower isolating switch and the lower isolating switch controller, when the upper isolating switch and the lower isolating switch are switched off at the same time, electric connection between an external input copper bar and an output cable and each element in the switch cabinet, especially the output cable, can be cut off, so that the problem that a main bus is electrified due to reverse power transmission can be completely avoided; maintenance personnel can carry out maintenance safely, and the safety of the whole switch cabinet is improved.

Description

Technical Field

[0001] The present application relates to the field of switch cabinets, and in particular to a double isolating switch structure of a switch cabinet. Background Art

[0002] The switchgear is suitable for small secondary substations, switchgear, box-type substations, residential areas, industrial and mining enterprises, and large shopping malls in the power system. It is especially suitable for airports, subways, railways and other places with high electricity requirements.

[0003] The isolating switch of the switch cabinet is an extremely important part of the switch cabinet. The isolating switch is the most commonly used electrical appliance in high-voltage switchgear. Its working principle and structure are relatively simple, but due to its large usage and high requirements for working reliability, it has a great impact on the design, establishment and safe operation of substations and power plants. The main function of the isolating switch is to establish a reliable insulation gap after opening the gate, and separate the line that needs to be repaired from the power supply with an obvious disconnection point to ensure the safety of maintenance personnel and equipment.

[0004] Most of the current switch cabinets are single-isolation structures, with only a three-position isolating switch installed on the bus side for isolation and grounding. Since the product is a fixed structure, the main busbar room and the circuit breaker room are separate compartments, and the circuit breaker is maintenance-free. During power outages and maintenance, the circuit breaker is placed in the open position, and then the three-position isolating switch is operated to the isolation position. The cable side circuit status is detected, and after confirming that the circuit is de-energized, it is continued to be operated to the grounding position; the circuit breaker is closed to achieve line side grounding. In some PT schemes, there is a risk of PT reverse power supply causing the main bus to be energized. When maintenance personnel perform maintenance, there are certain safety hazards.

[0005] Therefore, it is necessary to design a double isolating switch structure with a protective switch cabinet during power outage maintenance. Summary of the invention

[0006] Based on this, it is necessary to propose a double isolating switch structure for the switch cabinet to address the defect that traditional safety gratings will generate electric sparks.

[0007] The present application provides a double isolating switch structure of a switch cabinet, comprising a cabinet body, the cabinet body comprising a busbar chamber and a cable chamber, a circuit breaker and an isolating switch control device are arranged at the front side of the busbar chamber, the busbar chamber is provided with a busbar bar, an upper isolating switch, an upper busbar bar and a transformer bar which are electrically connected in sequence from top to bottom, the upper busbar bar is connected to the input end of the circuit breaker, and the transformer bar is connected to the output end of the circuit breaker;

[0008] The cable room is provided with a lower branch busbar, a lower isolating switch and a lower outgoing line busbar which are electrically connected in sequence from top to bottom, and a current transformer is provided between the transformer branch bar and the lower branch busbar;

[0009] The isolating switch control device comprises an upper isolating switch controller and a lower isolating switch controller, wherein the upper isolating switch controller is connected to and controls the upper isolating switch, and the lower isolating switch controller is connected to and controls the lower isolating switch.

[0010] Preferably, the upper isolating switch and the lower isolating switch have the same structure, and both include a support frame, a rotating connecting shaft, an insulating support and a grounding blade, the lower end of the grounding blade is electrically connected to the upper branch busbar, and the upper end of the grounding blade can be detachably buckled on the busbar.

[0011] Preferably, a nylon contact wall is provided on the rotating connecting shaft, the lower end of the grounding blade is rotatably fixed on the insulating support, the upper end of the grounding blade is connected to the end of the nylon contact wall, and an energy storage spring is also provided at one end of the rotating connecting shaft. The rotation of the rotating connecting shaft triggers the energy storage spring, so that the nylon contact wall quickly pushes the grounding blade.

[0012] Preferably, the upper isolating switch controller and the lower isolating switch controller are centrally symmetrically arranged, and both the upper isolating switch controller and the lower isolating switch controller include a first input shaft, a second transmission shaft and a third oblique shaft and a switch adjustment device which are sequentially connected in transmission.

[0013] Preferably, an input gear is provided at the end of the first input shaft, transmission gears are provided at both ends of the second transmission shaft and the third oblique shaft, and the second transmission shaft and the third oblique shaft are rotatably fixed on the cabinet.

[0014] Preferably, a synchronous tooth is provided at the end of the rotating connecting shaft close to the switch adjustment device, and the synchronous tooth and the rotating connecting shaft rotate coaxially.

[0015] Preferably, the switch adjustment device includes an adjustment base, a rotating adjustment rod and a driving rack. The rotating adjustment rod is rotatably fixed on the adjustment base, the lower end of the rotating adjustment rod is transmission connected to the third bevel gear, the upper end of the rotating adjustment rod is threadedly matched with the driving rack, and the driving rack is meshed with the synchronous gear.

[0016] Preferably, the adjustment base is further provided with two guide rods, the two guide rods and the rotary adjustment rod are arranged in parallel, and the lower end of the driving rack is slidably sleeved on the guide rods.

[0017] Preferably, the switch adjustment device further comprises a pair of limit blocks, wherein the two limit blocks are respectively located at two ends of the driving rack, and the two limit blocks respectively limit the upper and lower movement limit distances of the driving rack.

[0018] Preferably, a lightning arrester is provided at the lower end of the lower disconnector, and a sensor is provided at the end of the lower outgoing busbar.

[0019] Technical advantages of this application:

[0020] 1. First, by adding the upper and lower isolating switches, when the upper and lower isolating switches are disconnected at the same time, the external input copper busbar, output cable and various components in the switch cabinet, especially the output cable, can be disconnected. In this way, the problem of reverse power supply causing the main busbar to be energized can be completely avoided, so that maintenance personnel can carry out maintenance safely and improve the safety of the entire switch cabinet;

[0021] 2. At the same time, through the gear transmission between the first input shaft, the second transmission shaft and the third bevel shaft, the driving rack in the switch adjustment device is raised and lowered, thereby controlling the on and off of the upper isolating switch or the lower isolating switch. The gear transmission has a small transmission loss as a whole and accurate transmission. The operator only needs to rotate the first input shaft by a fixed angle or number of circles through an external tool, and the control is more precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0023] Figure 1 A three-dimensional schematic diagram of a double isolating switch structure of a switch cabinet provided in one embodiment of the present application.

[0024] Figure 2 A side view of a double isolating switch structure of a switch cabinet provided in one embodiment of the present application.

[0025] Figure 3 A front view of a double isolating switch structure of a switch cabinet provided in one embodiment of the present application.

[0026] Figure 4 It is a schematic diagram of the structure of the upper isolating switch controller and the upper isolating switch in one embodiment of the present application.

[0027] Figure 5 A side view of an upper isolating switch controller provided in one embodiment of the present application.

[0028] Figure 6 A schematic diagram of the three-dimensional structure of a switch adjustment device provided in one embodiment of the present application.

[0029] Figure 7 This is a schematic diagram of the structure of a lower isolating switch controller and a lower isolating switch in one embodiment of the present application.

[0030] Figure numerals: cabinet 1; busbar chamber 11; busbar 111; upper busbar 112; transformer branch 113; cable chamber 12; lower busbar 121; lower outgoing busbar 122; circuit breaker 2; disconnector control device 3; upper disconnector controller 31; first input shaft 311; input gear 3111; second transmission shaft 312; third oblique shaft 313; transmission gear 314; lower disconnector controller 32; switch adjustment device 33; adjustment base 331; rotating adjustment rod 332; driving rack 333; guide rod 334; limit block 335; upper disconnector 4; support frame 41; rotating connecting shaft 42; synchronous gear 421; insulating support 43; grounding blade 44; nylon contact wall 45; energy storage spring 46; lower disconnector 5; current transformer 6; lightning arrester 7; sensor 8. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] The existing switch cabinet equipment is only equipped with one isolating switch, which can only disconnect the electrical connection between the input busbar and the entire cabinet body, but the output cable is still connected to the entire switch cabinet through a conductive cable. A general high-voltage transmission site usually uses more than two high-voltage input lines, a common switch cabinet and a standby switch cabinet, both of which are connected to the user circuit through cables; when a fault occurs, the upper isolating switch of the common switch cabinet has disconnected the electrical connection with the input busbar, but its lower outgoing busbar is still electrically connected to the user circuit. When another standby switch cabinet is started, the common switch cabinet may be energized through the user circuit and the lower outgoing busbar. At this time, when maintenance personnel inspect the common switch cabinet, there is a great risk of electric shock.

[0033] In order to solve the above problems, the present application provides a double isolating switch structure of a switch cabinet, which adds a lower isolating switch to disconnect the electrical connection between the switch cabinet and the user circuit when repairing one of the switch cabinets, thereby preventing the user circuit from conducting electricity to the common switch cabinet when using the backup power supply, thereby causing harm to the maintenance personnel.

[0034] Example

[0035] like Figures 1 to 7 As shown, in one embodiment

[0036] like Figure 1-2As shown: a double isolating switch structure of a switch cabinet, including a cabinet body 1, the cabinet body 1 includes a busbar chamber 11 and a cable chamber 12, the upper busbar chamber 11 is a high-voltage circuit input chamber, and a circuit breaker 2 and an isolating switch control device 3 are arranged on the front side of the busbar chamber 11, the busbar chamber 11 is provided with a busbar row 111, an upper isolating switch 4, an upper branch busbar row 112 and a transformer branch row 113 which are electrically connected in sequence from top to bottom, an upper isolating switch 4 is arranged between the busbar row 111 and the upper branch busbar 112, the upper branch busbar 112 is connected to the input end of the circuit breaker 2, and the transformer branch row 113 is connected to the output end of the circuit breaker 2; a current transformer 6 is arranged between the transformer branch row 113 and the lower branch busbar 121; the current transformer 6 is fixed on the cabinet body 1, and the entire body of the current transformer 6 is provided with insulating material.

[0037] In order to be able to disconnect the electrical connection with the user circuit, a group of isolating switches is added, namely the lower isolating switch 5. The cable chamber 12 is provided with a lower branch bus 121, a lower isolating switch 5 and a lower outgoing busbar 122 which are electrically connected in sequence from top to bottom. The lower end of the lower isolating switch 5 is also provided with a lightning arrester 7. The end of the lower outgoing busbar 122 is also provided with a sensor 8. At the same time, one end of the lower outgoing busbar 122 connected to the lower isolating switch 5 is connected to the lightning arrester 7, and the other end of the lower outgoing busbar 122 is connected to an external cable, which is electrically connected to an external transformer and a user circuit. The opening or closing of the lower isolating switch 5 mainly disconnects and connects the lower outgoing busbar 122. Before maintenance, the grounding knife parts of the upper isolating switch 4 and the lower isolating switch need to be disconnected at the same time to ensure that the entire switch cabinet is in a power-free state before maintenance can be carried out, thereby improving the safety of maintenance personnel.

[0038] The structures of the upper isolating switch 4 and the lower isolating switch 5 are exactly the same, except that they are located in different positions. The two ends of the upper isolating switch 4 are respectively connected to the busbar 111 and the upper branch busbar 112, which are used to disconnect the busbar 111, that is, to input high voltage electricity. The two ends of the lower isolating switch 5 are respectively connected to the lower branch busbar 121 and the lower outgoing busbar 122, which are used to disconnect the switch cabinet and the external circuit.

[0039] By adding the lower isolating switch 4 and the lower isolating switch 5, when the upper isolating switch 4 and the lower isolating switch 5 are disconnected at the same time, the external input copper busbar, the output cable and the components in the switch cabinet, especially the output cable, can be disconnected. In this way, the problem of reverse power supply causing the main bus to be energized can be completely avoided, so that maintenance personnel can carry out maintenance safely and the safety of the entire switch cabinet is improved.

[0040] like Figure 2-3As shown: Specifically, the upper disconnector 4 and the lower disconnector 5 in the utility model both include a support frame 41, a rotating connecting shaft 42, an insulating support 43 and a grounding blade 44, the lower end of the grounding blade 44 is electrically connected to the upper branch busbar 112, the upper end of the grounding blade 44 is detachably buckled on the busbar 111, a nylon contact wall 45 is provided on the rotating connecting shaft 42, the lower end of the grounding blade 44 is rotatably fixed on the insulating support 43, the upper end of the grounding blade 44 is connected to the end of the nylon contact wall 45, and one end of the rotating connecting shaft 42 is also provided with an energy storage spring 46, the rotating connecting shaft 42 rotates to trigger the energy storage spring 46, so that the nylon contact wall 45 quickly pushes the grounding blade 44.

[0041] The isolating switch control device 3 of the utility model is arranged at the front end of the circuit breaker 2 and is at the same position as the mechanical axis switch of the circuit breaker. Specifically, the isolating switch control device 3 includes an upper isolating switch controller 31 and a lower isolating switch controller 32. The upper isolating switch controller 31 is connected to and controls the upper isolating switch 4, and the lower isolating switch controller 32 is connected to and controls the lower isolating switch 5.

[0042] The upper isolating switch controller 31 and the lower isolating switch controller 32 are centrally symmetrically arranged, and are respectively connected to and control the upper isolating switch and the lower isolating switch. The upper isolating switch controller 31 and the lower isolating switch controller 32 have the same internal structure and basic transmission mode.

[0043] Specifically, Figure 4-7 As shown: the upper isolating switch controller 31 and the lower isolating switch controller 32 of the utility model both include a first input shaft 311, a second transmission shaft 312, a third oblique shaft 313 and a switch adjustment device 33 which are sequentially connected in transmission. The front end of the first input shaft 311 is provided with a connecting end. The operator rotates the first input shaft 311 through an external rotating handle, which is engaged with the connecting end to provide power for disconnecting the isolating switch. An input gear 3111 is provided at the end of the first input shaft 311. Both ends of the second transmission shaft 312 and the third oblique shaft 313 are provided with transmission gears 314. The second transmission shaft 312 and the third oblique shaft 313 are both rotatably fixed on the cabinet 1.

[0044] A synchronous tooth 421 is provided at the end of the rotary connecting shaft 42 close to the switch adjustment device 33 , and the synchronous tooth 421 rotates coaxially with the rotary connecting shaft 42 .

[0045] like Figure 6As shown: the main device for adjusting the on and off of the upper isolating switch 4 or the lower isolating switch 5 of the utility model is the switch adjustment device 33, the switch adjustment device 33 includes an adjustment base 331, a rotating adjustment rod 332 and a driving rack 333, the adjustment base 331 is fixed on the cabinet 1, and plays a supporting role, the rotating adjustment rod 332 is rotatably fixed on the adjustment base 331, and the axis of the rotating adjustment rod 332 passes through the adjustment base 331 and rotates with the adjustment base 331.

[0046] The lower end of the rotation adjustment rod 332 is connected to the third oblique shaft 313 by gear transmission, and the upper end of the rotation adjustment rod 332 is threadedly matched with the driving rack 333, and the driving rack 333 is gear-engaged with the synchronous tooth 421.

[0047] Two guide rods 334 are also provided on the adjustment base 331 . The two guide rods 334 and the rotation adjustment rod 332 are arranged in parallel. The lower end of the driving rack 333 is slidably sleeved on the guide rods 334 .

[0048] The switch adjustment device 33 further includes a pair of limit blocks 335 . The two limit blocks 335 are respectively located at two ends of the driving rack 333 . The two limit blocks 335 respectively limit the upper and lower movement limit distances of the driving rack 333 .

[0049] like Figure 7 As shown: the lower isolating switch 5 is also connected to a lower isolating switch controller 32, the lower isolating switch controller 32 and the upper isolating switch controller 31 have exactly the same structural composition, but are in opposite directions, the lower isolating switch controller 32 also includes an adjustment base 331, a rotating adjustment rod 332 and a driving rack 333, the adjustment base 331 is fixed on the cabinet 1, and plays a supporting role, the rotating adjustment rod 332 is rotatably fixed on the adjustment base 331, the axis of the rotating adjustment rod 332 passes through the adjustment base 331, and rotates with the adjustment base 331, and two guide rods 334 are also provided on the adjustment base 331, the two guide rods 334 and the rotating adjustment rod 332 are arranged in parallel, and the lower end of the driving rack 333 is slidably sleeved on the guide rod 334.

[0050] In summary: the utility model adds a lower isolating switch 4 and a lower isolating switch 5. When the upper isolating switch 4 and the lower isolating switch 5 are disconnected at the same time, the external input copper busbar, the output cable and the components in the switch cabinet, especially the output cable, can be disconnected. In this way, the problem of reverse power transmission causing the main busbar to be energized can be completely avoided, so that maintenance personnel can carry out maintenance safely and improve the safety of the entire switch cabinet. Through the gear transmission between the first input shaft 311, the second transmission shaft 312 and the third oblique shaft 313, the driving rack 333 in the switch adjustment device 33 is raised and lowered, thereby controlling the on and off of the grounding blade 44 in the upper isolating switch 4 or the lower isolating switch 5. The gear transmission has a small transmission loss as a whole and is accurate in transmission. The operator only needs to rotate the first input shaft 311 by a fixed angle or number of circles through an external tool, and the control is relatively accurate.

[0051] The technical features of the above-described embodiments may be arbitrarily combined, and the execution order of the method steps is not limited. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A double isolating switch structure of a switch cabinet, comprising a cabinet body (1), characterized in that: The cabinet (1) comprises a busbar chamber (11) and a cable chamber (12); a circuit breaker (2) and an isolating switch control device (3) are arranged on the front side of the busbar chamber (11); the busbar chamber (11) is provided with a busbar (111), an upper isolating switch (4), an upper branch busbar (112) and a transformer branch bar (113) which are electrically connected in sequence from top to bottom; the upper branch busbar (112) is connected to the input end of the circuit breaker (2), and the transformer branch bar (113) is connected to the output end of the circuit breaker (2); The cable chamber (12) is provided with a lower branch busbar (121), a lower disconnector (5) and a lower outgoing busbar (122) which are electrically connected in sequence from top to bottom, and a current transformer (6) is provided between the transformer branch bar (113) and the lower branch busbar (121); The isolating switch control device (3) comprises an upper isolating switch controller (31) and a lower isolating switch controller (32), wherein the upper isolating switch controller (31) is connected to and controls the upper isolating switch (4), and the lower isolating switch controller (32) is connected to and controls the lower isolating switch (5).

2. The double isolating switch structure of the switch cabinet according to claim 1 is characterized in that: The upper disconnector (4) and the lower disconnector (5) have the same structure. Both the upper disconnector (4) and the lower disconnector (5) comprise a support frame (41), a rotating connecting shaft (42), an insulating support member (43) and a grounding blade (44). The lower end of the grounding blade (44) is electrically connected to the upper branch busbar (112), and the upper end of the grounding blade (44) is detachably buckled on the busbar (111).

3. The double isolating switch structure of the switch cabinet according to claim 2 is characterized in that: A nylon contact wall (45) is provided on the rotating connecting shaft (42); the lower end of the grounding blade (44) is rotatably fixed on the insulating support (43); the upper end of the grounding blade (44) is connected to the end of the nylon contact wall (45); an energy storage spring (46) is also provided at one end of the rotating connecting shaft (42); the rotating connecting shaft (42) rotates to trigger the energy storage spring (46), so that the nylon contact wall (45) quickly pushes the grounding blade (44).

4. The double isolating switch structure of the switch cabinet according to claim 3 is characterized in that: The upper isolating switch controller (31) and the lower isolating switch controller (32) are centrally symmetrically arranged, and each of the upper isolating switch controller (31) and the lower isolating switch controller (32) comprises a first input shaft (311), a second transmission shaft (312), a third oblique shaft (313) and a switch adjustment device (33) which are sequentially connected in transmission.

5. The double isolating switch structure of the switch cabinet according to claim 4, characterized in that: An input gear (3111) is provided at the end of the first input shaft (311), and transmission gears (314) are provided at both ends of the second transmission shaft (312) and the third oblique shaft (313), and the second transmission shaft (312) and the third oblique shaft (313) are both rotatably fixed on the cabinet (1).

6. The double isolating switch structure of the switch cabinet according to claim 5, characterized in that: The end of the rotary connection shaft (42) close to the switch adjustment device (33) is provided with a synchronous tooth (421), and the synchronous tooth (421) and the rotary connection shaft (42) rotate coaxially.

7. The double isolating switch structure of the switch cabinet according to claim 6, characterized in that: The switch adjustment device (33) comprises an adjustment base (331), a rotary adjustment rod (332) and a driving rack (333); the rotary adjustment rod (332) is rotatably fixed to the adjustment base (331); the lower end of the rotary adjustment rod (332) is gear-connected to the third oblique shaft (313); the upper end of the rotary adjustment rod (332) is threadedly matched to the driving rack (333); and the driving rack (333) is gear-engaged with a synchronous tooth (421).

8. The double isolating switch structure of the switch cabinet according to claim 7, characterized in that: The adjustment base (331) is also provided with two guide rods (334), the two guide rods (334) and the rotary adjustment rod (332) are arranged in parallel, and the lower end of the driving rack (333) is slidably sleeved on the guide rods (334).

9. The double isolating switch structure of the switch cabinet according to claim 8, characterized in that: The switch adjustment device (33) further comprises a pair of limit blocks (335), wherein the two limit blocks (335) are respectively located at two ends of the driving rack (333), and the two limit blocks (335) respectively limit the upper and lower movement limit distances of the driving rack (333).

10. The double isolating switch structure of the switch cabinet according to claim 1, characterized in that: A lightning arrester (7) is also provided at the lower end of the lower disconnector (5), and a sensor (8) is also provided at the end of the lower outgoing busbar (122).

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