Mechanical interlocking device of inflatable high-voltage switch cabinet

Abstract

The utility model discloses a mechanical interlocking device of an inflatable high-voltage switch cabinet. The mechanical interlocking device comprises a first interlocking assembly, a second interlocking assembly and a third interlocking assembly, the first interlocking assembly is located between the circuit breaker and an operation panel of the three-position switch and used for achieving interlocking between the circuit breaker and the operation panel of the three-position switch. The second interlocking assembly is located between the circuit breaker and a state panel of the three-position switch and is used for realizing interlocking between the circuit breaker and the state panel; the third interlocking assembly is positioned between the second interlocking assembly and the rear door and is used for realizing interlocking among the circuit breaker, the three-position switch and the rear door; the third interlocking assembly comprises a lock catch sheet, a connecting rod and a rear door interlocking assembly; and the lock catch sheet is connected with the rear door interlocking assembly through a connecting rod. The device has the advantages of simple structure, simplicity and convenience in operation, safety, reliability and the like.

Description

Technical Field

[0001] This utility model mainly relates to the field of gas-insulated switchgear technology, specifically to a mechanical interlocking device for a gas-insulated high-voltage switchgear. Background Technology

[0002] Foreign gas-insulated switchgear products are fully enclosed, with the exterior completely grounded, eliminating the risk of contact with high-voltage conductors. Therefore, there is no requirement for mechanical interlocking between the rear cable compartment door and the three-position grounding switch. However, in actual operation and maintenance, there is indeed a possibility of risks arising due to improper operation.

[0003] The cable compartment of a CGIS-40.5 gas-insulated switchgear is typically located at the rear of the cabinet. The cable compartment door is mechanically interlocked. Because it involves circuit breakers and a three-position mechanism, unlike air-insulated switchgear which only involves the grounding switch, design solutions are challenging. Most domestic manufacturers outsource their circuit breakers and three-position mechanisms, lacking their own technology. Furthermore, CGIS-40.5 gas-insulated switchgear is currently a niche product, making it difficult to find suitable models for imitation. This is why most manufacturers lack such solutions. State Grid enterprise standard Q / GDW 13088.1—2018 and power industry standard DL / T 404—2018 both stipulate that the cable compartment door (the door of the compartment) should be mechanically interlocked with the grounding switch; the compartment door can only be opened after the grounding switch is closed. Currently, almost all CGIS-40.5 gas-insulated high-voltage switchgear in the industry suffers from the following typical problems with the rear cable compartment interlocking:

[0004] 1. Neither electrical nor mechanical interlocks were installed.

[0005] 2. An electromagnetic lock is installed as an electrical interlock, but no mechanical interlock is installed;

[0006] During normal operation, the rear cable compartment door of the CGIS-40.5 gas-insulated switchgear remains closed, and its primary main circuit is energized. The door cannot be opened from the outside. For maintenance or repair, the following steps must be performed: disconnect the circuit breaker, adjust the three-position switch to the grounded position, and then close the circuit breaker again to release the interlocking mechanism. Only then can the cable compartment door be opened. After maintenance, the following sequence must be followed: first ensure the cable compartment door is tightly closed, then disconnect the circuit breaker, return the three-position isolating switch to the closed position, and finally close the circuit breaker to restore normal power supply to the primary main circuit. It is important to emphasize that the opening and closing of the cable compartment door is only permitted when the three-position switch is grounded and the circuit breaker is closed.

[0007] The reliability of electrical interlocking is limited by the performance of electromagnetic locks, the accuracy of electrical signal acquisition, and various external factors, resulting in a low safety factor. Furthermore, the components in electrical interlocking systems are prone to damage, and they are insufficient in preventing human error, posing certain potential safety hazards.

[0008] Mechanical interlocking requires a long transmission distance from the top front to the bottom rear of the cabinet. Furthermore, the small size and compact structure of the gas-insulated switchgear, along with the modular design of its components, make mechanical interlocking complex or difficult to implement. In addition, the circuit breaker's mechanical life requirement of at least 10,000 cycles necessitates consideration of the lifespan matching and reliability of the circuit breaker and interlocking mechanism. Utility Model Content

[0009] To address the technical problems existing in the prior art, this utility model provides a mechanical interlocking device for an inflatable high-voltage switchgear that is simple in structure, easy to operate, and safe and reliable.

[0010] A mechanical interlocking device for a gas-insulated high-voltage switchgear includes a first interlocking assembly, a second interlocking assembly, and a third interlocking assembly; the first interlocking assembly is located between the operating panels of the circuit breaker and the three-position switch, and is used to realize the interlocking between the operating panels of the circuit breaker and the three-position switch.

[0011] The second interlocking component is located between the status panel of the circuit breaker and the three-position switch, and is used to realize the interlock between the circuit breaker and the status panel;

[0012] The third interlocking component is located between the second interlocking component and the rear door, and is used to realize the interlocking between the circuit breaker, the three-position switch and the rear door;

[0013] The third interlocking assembly includes a latch plate, a connecting rod, and a rear door interlocking assembly; the latch plate is connected to the rear door interlocking assembly via the connecting rod.

[0014] As a further improvement to the above technical solution:

[0015] The first interlocking assembly includes a circuit breaker closing stop plate and an interlocking unit; the circuit breaker closing stop plate is located on the circuit breaker shaft; the lower end of the interlocking unit is provided with a first limiting plate, which is used to form a cooperating relationship with the circuit breaker closing stop plate; the upper end of the interlocking unit is provided with a bearing; the bearing is locked in the notch of the closing lock plate; the operation panel of the three-position switch and the closing lock plate are located on the same axis.

[0016] The interlocking unit includes a first interlocking rod, a second interlocking rod, a third interlocking rod, and a fourth interlocking rod; the first interlocking rod, the second interlocking rod, the third interlocking rod, and the fourth interlocking rod are connected in sequence; the second interlocking rod is an adjustable lead screw; the bearing is located on the first interlocking rod, and the first limiting piece is located on the fourth interlocking rod.

[0017] The second interlocking assembly includes a circuit breaker tripping stop, a second limiting plate, a fifth interlocking rod, and a sixth interlocking rod. The fifth and sixth interlocking rods are connected. The circuit breaker tripping stop is located on the circuit breaker shaft, and the second limiting plate is located on the sixth interlocking rod. The latching plate is provided with a limiting hole, and the sixth interlocking rod cooperates with the latching plate through the limiting hole to form an interlocking relationship.

[0018] The limiting hole is a square hole.

[0019] The rear door interlocking assembly includes a limiting plate, a chain rod, a latch, and an unlocking assembly; the limiting plate is installed on the cabinet, the chain rod is located at one end of a connecting rod, the latch is located on the chain rod, an elastic element is provided on the connecting rod between the limiting plate and the chain rod, and the unlocking assembly cooperates with the latch to form an interlock.

[0020] The unlocking component includes a pin, one end of which is opposite to the interlocking rod, and a groove is provided on its periphery to cooperate with the latch to form an interlock.

[0021] The elastic element is a return spring.

[0022] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows:

[0023] Compared with the prior art, the advantages of this utility model are:

[0024] This utility model adopts a purely mechanical interlocking system. Through the above-described mechanical five-proof interlocking structure, it ensures that the three-position switch cannot be operated after the circuit breaker is closed; the cable compartment door can only be opened when the three-position switch is operated to the grounding position and the circuit breaker is in the closed position; the circuit breaker is not allowed to open when the three-position switch is not in the grounding position; it achieves locking and reverse locking between the rear cable compartment door and the grounding switch main shaft, and the rear cable compartment door can also achieve an emergency unlocking function; the connecting rod uses a flat strip shape, which does not affect the intermediate switch gas box, meets the five-proof requirements, is simple to operate, and is safe and reliable. This mechanical interlocking structure is simple, easy to install, simple and reliable to operate, and has accurate transmission, which can improve the safety of CGIS-40.5 equipment during use. Attached Figure Description

[0025] Figure 1 This is a diagram illustrating an embodiment of the mechanical interlocking device of this utility model in a specific application.

[0026] Figure 2 This is a front view structural diagram of the mechanical interlocking device of this utility model in an embodiment.

[0027] Figure 3This is a three-dimensional structural diagram of the mechanical interlocking device of this utility model in an embodiment.

[0028] Figure 4 This is a three-dimensional structural diagram of the rear door interlocking assembly of this utility model in an embodiment.

[0029] Legend: 1. First interlocking assembly; 101. Circuit breaker closing stop plate; 102. First limit plate; 103. Interlocking unit; 1031. First interlocking rod; 1032. Second interlocking rod; 1033. Third interlocking rod; 1034. Fourth interlocking rod; 104. Closing lock plate; 2. Second interlocking assembly; 201. Fifth interlocking rod; 202. Sixth interlocking rod; 203. Circuit breaker opening stop plate; 204. Second limit plate; 2 5. Manual unlocking device; 3. Third interlocking assembly; 301. Snap plate; 3011. Limiting hole; 302. Linking rod; 303. Rear door interlocking assembly; 3031. Limiting plate; 3032. Interlocking rod; 3033. Snap; 3034. Elastic element; 304. Unlocking assembly; 3041. Pin; 3042. Groove; 4. Circuit breaker; 401. Rotating shaft; 5. Three-position switch; 501. Operation panel; 502. Status panel. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, the mechanical interlocking device of the gas-insulated high-voltage switchgear of this utility model embodiment includes a first interlocking component 1, a second interlocking component 2 and a third interlocking component 3; the first interlocking component 1 is located between the operation panel 501 of the circuit breaker 4 and the three-position switch 5, and is used to realize the interlocking between the operation panel 501 of the circuit breaker 4 and the three-position switch 5.

[0032] The second interlocking component 2 is located between the status panel 502 of the circuit breaker 4 and the three-position switch 5, and is used to realize the interlocking between the circuit breaker 4 and the status panel 502.

[0033] The third interlocking component 3 is located between the second interlocking component 2 and the rear door, and is used to realize the interlocking between the circuit breaker 4, the three-position switch 5 and the rear door;

[0034] The third interlocking assembly 3 includes a latch plate 301, a connecting rod 302, and a rear door interlocking assembly 303; the latch plate 301 is connected to the rear door interlocking assembly 303 via the connecting rod 302.

[0035] In one specific embodiment, the first interlocking assembly 1 includes a circuit breaker closing stop plate 101 and an interlocking unit 103; the circuit breaker closing stop plate 101 is located on the circuit breaker rotating shaft 401; the lower end of the interlocking unit 103 is provided with a first limiting piece 102, which is used to form a cooperating relationship with the circuit breaker closing stop plate 101; the upper end of the interlocking unit 103 is provided with a bearing; the bearing is locked in the notch of the closing locking plate 104; the three-position switch operation panel 501 and the closing locking plate 104 are located on the same axis. Specifically, the interlocking unit 103 includes a first interlocking rod 1031, a second interlocking rod 1032, a third interlocking rod 1033, and a fourth interlocking rod 1034; the first interlocking rod 1031, the second interlocking rod 1032, the third interlocking rod 1033, and the fourth interlocking rod 1034 are connected in sequence; the second interlocking rod 1032 is an adjustable lead screw; the bearing is located on the first interlocking rod 1031, and the first limiting piece 102 is located on the fourth interlocking rod 1034.

[0036] The interlocking function between circuit breaker 4 and three-position switch 5 is achieved through the first interlocking component 1 mentioned above. The specific principle is as follows:

[0037] After circuit breaker 4 is closed, the shaft 401 of circuit breaker 4 rotates clockwise, and the closing baffle 101 of the circuit breaker rotates downward, preventing the fourth interlocking rod 1034 from moving upward. Through the third interlocking rod 1033 and the adjustable screw, the first interlocking rod 1031 is pulled. At this time, the bearing of the first interlocking rod 1031 will be stuck on the notch of the closing locking plate 104 (this panel is round and has a notch at the top), so the closing locking plate 104 cannot rotate. Since the closing locking plate 104 and the three-position operation panel 501 are located on the same shaft, the entire shaft cannot rotate at this time. The operation hole of the three-position switch 5 is blocked, and the three-position switch 5 cannot be operated (satisfying that the three-position switch 5 is not allowed to be operated after the circuit breaker 4 is closed).

[0038] After circuit breaker 4 is tripped, the shaft 401 of circuit breaker 4 rotates counterclockwise, the closing baffle 101 of circuit breaker rotates upward, and the fourth interlocking rod 1034 can move freely upward. After passing through the third interlocking rod 1033 and the adjustable screw, the bearing of the first interlocking rod 1031 is released from the closing lock function. When it is necessary to operate the three-position switch 5, the panel of the three-position switch 5 must first be rotated to the corresponding operating position, which will pull the first interlocking rod 1031 upward, drive the interlocking link to move downward, and lock the closing half shaft to rotate, thereby preventing circuit breaker 4 from closing when operating the three-position switch 5.

[0039] In one specific embodiment, the second interlocking assembly 2 includes a circuit breaker tripping stop 203, a second limiting plate 204, a fifth interlocking rod 201, and a sixth interlocking rod 202. The fifth interlocking rod 201 and the sixth interlocking rod 202 are connected. The circuit breaker tripping stop 203 is located on the circuit breaker rotating shaft 401, and the second limiting plate 204 is located on the sixth interlocking rod 202. The latching plate 301 is provided with a limiting hole 3011 (such as a square hole). The sixth interlocking rod 202 cooperates with the latching plate 301 through the limiting hole 3011 to form an interlocking relationship.

[0040] The second interlocking component 2 is used to interlock the circuit breaker 4, the three-position switch 5, and the rear door. The specific implementation process is as follows:

[0041] When the three-position grounding switch is in the closed position, the notch on the panel of the three-position switch 5 aligns with the fifth interlocking rod 201. When the circuit breaker 4 is closed, the circuit breaker tripping stop 203 is raised, leaving space for the fifth interlocking rod 201 and the sixth interlocking rod 202 to move up and down. The fifth interlocking rod 201 and the sixth interlocking rod 202 are moved upward to the unlocking position using the manual unlocking device 205. The sixth interlocking rod 202 moves out of the limiting hole 3011 of the latching piece 301, and the rear door can be opened. At the same time, the second limiting piece 204 on the sixth interlocking rod 202 locks the tripping half shaft to rotate counterclockwise, preventing the circuit breaker 4 from tripping.

[0042] When the rear door is not fully closed, the latch plate 301 is positioned rearward, and the limit hole 3011 on the latch plate 301 is misaligned with the sixth locking rod 202. The sixth locking rod 202 cannot move downwards, and the circuit breaker 4 cannot trip. Conversely, when the rear door is fully closed, the sixth locking rod 202 aligns vertically with the limit hole 3011 on the latch plate 301, allowing the sixth locking rod 202 to move downwards, and the circuit breaker 4 can trip.

[0043] In one specific embodiment, such as Figure 4 As shown, the rear door interlock assembly 303 includes a limiting plate 3031, a chain rod 3032, a latch 3033, and an unlocking assembly 304. The limiting plate 3031 is mounted on the cabinet body, the chain rod 3032 is located at one end of the connecting rod 302, and the latch 3033 is located on the chain rod 3032. An elastic element 3034 (such as a return spring) is provided on the connecting rod 302 between the limiting plate 3031 and the chain rod 3032. The unlocking assembly 304 and the latch 3033 cooperate with each other to form an interlock. The unlocking assembly 304 includes a pin 3041, one end of which is opposite to the chain rod 3032, and a groove 3042 is provided on its periphery to cooperate with the latch 3033 to form an interlock.

[0044] The interlocking process of the aforementioned rear door interlocking assembly 303 is as follows:

[0045] When the rear cabinet door is closed, the ejector pin 3041 installed behind the cabinet door pushes the interlocking rod 3032 and the connecting rod 302, which can move back and forth, inward. The interlocking rod 3032 is equipped with a return spring and a latch 3033. The latch 3033 and the groove 3042 cooperate to lock when the cabinet door is closed and unlock when the cabinet door is opened.

[0046] This utility model adopts a purely mechanical interlocking system. Through the above-described mechanical five-proof interlocking structure, it ensures that when circuit breaker 4 is closed, the three-position switch 5 cannot be operated; when the three-position switch 5 is operated to the grounding position and circuit breaker 4 is in the closed position, the cable compartment door can be opened; when the three-position switch 5 is not in the grounding position, circuit breaker 4 is not allowed to open; it achieves locking and reverse locking between the rear cable compartment door and the grounding switch main shaft, and the rear cable compartment door can also achieve an emergency unlocking function; the connecting rod 302 uses a flat strip shape, which does not affect the intermediate switch gas box, meets the five-proof requirements, is simple to operate, and is safe and reliable. This mechanical interlocking structure is simple, easy to install, simple and reliable to operate, and has accurate transmission, which can improve the safety of CGIS-40.5 equipment during use.

[0047] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should be considered within its protection scope.

Claims

1. A mechanical interlocking device for an inflatable high voltage switchgear, characterized in that, The utility model relates to a kind of interlocking device of circuit breaker and three-position switch, including first interlocking component (1), second interlocking component (2) and third interlocking component (3);The first interlocking component (1) is located between circuit breaker (4) and the operating panel (501) of three-position switch (5), for realizing the interlocking between circuit breaker (4) and the operating panel (501) of three-position switch (5); The second interlocking component (2) is located between circuit breaker (4) and the status panel (502) of three-position switch (5), for realizing the interlocking between circuit breaker (4) and the status panel (502); The third interlocking component (3) is located between the second interlocking component (2) and rear door, for realizing the interlocking between circuit breaker (4), three-position switch (5) and rear door; The third interlocking component (3) includes lock catch piece (301), connecting rod (302) and rear door interlocking component (303);The lock catch piece (301) is connected with the rear door interlocking component (303) by connecting rod (302).

2. The mechanical interlocking device of the gas-filled high-voltage switchgear according to claim 1, characterized in that, The first interlocking component (1) includes circuit breaker closing baffle (101) and interlocking unit (103);The circuit breaker closing baffle (101) is located on circuit breaker pivot (401);The lower end of the interlocking unit (103) is equipped with first limiting piece (102), for forming cooperation with circuit breaker closing baffle (101);The upper end of the interlocking unit (103) is equipped with bearing;The bearing is clamped in the notch of closing lock card (104);The operating panel (501) of three-position switch (5) and closing lock card (104) are located on the same shaft.

3. The mechanical interlocking device of the gas-filled high-voltage switchgear according to claim 2, characterized in that, The interlocking unit (103) includes first interlocking rod (1031), second interlocking rod (1032), third interlocking rod (1033) and fourth interlocking rod (1034);The first interlocking rod (1031), second interlocking rod (1032), third interlocking rod (1033) and fourth interlocking rod (1034) are sequentially connected;The second interlocking rod (1032) is adjustable screw rod;The bearing is located on the first interlocking rod (1031), and the first limiting piece (102) is located on the fourth interlocking rod (1034).

4. The mechanical interlocking device of the gas-filled high voltage switchgear according to claim 1 or 2 or 3, characterized in that, The second interlocking component (2) includes circuit breaker opening baffle (203), second limiting piece (204), fifth interlocking rod (201) and sixth interlocking rod (202), the fifth interlocking rod (201) and sixth interlocking rod (202) are connected, the circuit breaker opening baffle (203) is located on circuit breaker pivot (401), and the second limiting piece (204) is located on the sixth interlocking rod (202);Limiting hole (3011) is equipped on the lock catch (3033) piece, and the sixth interlocking rod (202) cooperates with lock catch (3033) piece through limiting hole (3011) to form interlocking relationship.

5. The mechanical interlocking device of the gas-filled high-voltage switchgear according to claim 4, characterized in that, The limiting hole (3011) is square hole.

6. The mechanical interlocking device of the gas-filled high voltage switchgear according to claim 1 or 2 or 3, characterized in that, The back door interlocking assembly (303) comprises a limiting plate (3031), an interlocking rod (3032), a lock catch (3033) and an unlocking assembly (304); the limiting plate (3031) is installed on the cabinet body, the interlocking rod (3032) is located at one end of the connecting rod (302), the lock catch (3033) is located on the interlocking rod (3032), an elastic element (3034) is arranged on the connecting rod (302) between the limiting plate (3031) and the interlocking rod (3032), and the unlocking assembly (304) is matched with the lock catch (3033) to form interlocking.

7. The mechanical interlocking device of the gas-filled high-voltage switchgear according to claim 6, characterized in that, The unlocking assembly (304) comprises a thimble (3041), one end of the thimble (3041) is opposite to the interlocking rod (3032), and a groove (3042) is formed in the thimble (3041) to be matched with the lock catch (3033) to form interlocking.

8. The mechanical interlocking device of the gas-filled high voltage switchgear according to claim 6, characterized in that, The elastic element (3034) is a reset spring.

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