Five-prevention interlocking switchgear

Abstract

The present invention relates to a five-prevention interlocking switch cabinet, which includes a cabinet body, a vacuum circuit breaker, a disconnector, an earthing switch and a five-prevention interlocking mechanism arranged in the cabinet body. The locking rotating shaft of the five-prevention interlocking mechanism is linked with the main shaft of the vacuum circuit breaker through a connecting plate, the isolating rotating shaft is linked with the disconnector, and the earthing rotating shaft is linked with the earthing switch. By means of the five-prevention interlocking mechanism, the disconnector, the earthing switch and the cabinet door are locked when the vacuum circuit breaker is closed, thus preventing misoperation when the vacuum circuit breaker is closed; the five-prevention interlocking mechanism is locked with the closing pawl of the vacuum circuit breaker, eliminating the potential safety hazard of misclosing when the vacuum circuit breaker is tripped, with high safety; at the same time, the structure of the five-prevention interlocking switch cabinet is simple and the installation is convenient.

Description

Technical Field

[0001] The present invention relates to a switch cabinet, in particular to a five-prevention interlocking switch cabinet adopting a novel five-prevention interlocking mechanism. Background Art

[0002] The main function of the switch cabinet is to switch on and off, control and protect electrical equipment during the processes of power generation, power transmission, power distribution and power conversion in the power system. The main components in the switch cabinet are vacuum circuit breakers, disconnectors and earthing switches. In order to achieve the five-prevention of the switch cabinet, a five-prevention interlocking mechanism needs to be arranged between the components.

[0003] The five-prevention interlocking mechanism of the existing five-prevention interlocking switch cabinet usually adopts a linkage method to ensure that the vacuum circuit breaker can be disconnected simultaneously with the disconnector and the earthing switch. When the disconnector is disconnected under load, the five-prevention interlocking mechanism will simultaneously disconnect the vacuum circuit breaker, which cannot prevent misoperation from occurring, but only reduce the consequences of misoperation, and there are certain potential safety hazards; in order to ensure that the five-prevention interlocking mechanism can disconnect the vacuum circuit breaker in time, the five-prevention interlocking mechanism is usually connected in linkage with the closing lock of the vacuum circuit breaker. Only after the circuit breaker is disconnected can the five-prevention interlocking mechanism be operated. However, in this connection method, only the opening and closing position signal of the circuit breaker is uploaded through the electrical opening and closing points, and the circuit breaker can still be closed when disconnecting the closing electrical control circuit of the circuit breaker and operating other equipment in the cabinet. It will be immediately disconnected after closing, and there are certain potential safety hazards during the operation process; moreover, the existing five-prevention interlocking mechanisms are scattered at the circuit breaker, disconnector and earthing switch, resulting in a complex structure of the switch cabinet and inconvenient installation. Summary of the Invention

[0004] Aiming at the above deficiencies, the present invention provides a five-prevention interlocking switch cabinet connected integrally with the operating mechanism of the circuit breaker. By collecting the opening and closing positions of the main shaft of the circuit breaker and carrying out the interconnection and interlocking operation sequence centered on locking the closing of the circuit breaker, it has the advantages of high safety, compact structure and convenient installation.

[0005] To achieve the above object, the present invention adopts a five-prevention interlocking switch cabinet, which includes a cabinet body, a vacuum circuit breaker, a disconnector, and an earthing switch arranged in the cabinet body. The five-prevention interlocking switch cabinet further includes a five-prevention interlocking mechanism, which is arranged below the vacuum circuit breaker. The five-prevention interlocking mechanism includes a chassis, a door-closing rotating shaft, a locking rotating shaft, an isolating lock rod, and a locking push rod. The door-closing rotating shaft, the isolating lock rod, and the locking push rod are arranged in parallel in the chassis. The locking rotating shaft is arranged perpendicular to the door-closing rotating shaft, the isolating lock rod, and the locking push rod in the chassis. A connecting plate is arranged on the locking rotating shaft, and the connecting plate is linked with the main shaft of the vacuum circuit breaker. A tripping pawl is arranged at the intersection position of the locking rotating shaft and the isolating lock rod, and a tripping block is arranged on the isolating lock rod corresponding to the tripping pawl. An active wheel plate and an isolating locking plate are respectively arranged at both ends of the isolating lock rod, and an earthing locking plate and a cam plate are respectively arranged at both ends of the locking push rod. Isolating rotating shafts and earthing rotating shafts are respectively arranged in parallel on both sides of the locking rotating shaft. The isolating locking plate and the cam plate are sleeved on the isolating rotating shaft and rotate coaxially, and the active wheel plate and the earthing locking plate are sleeved on the earthing rotating shaft and rotate coaxially. The isolating rotating shaft is linked with the disconnector, and the earthing rotating shaft is linked with the earthing switch. Locking grooves for cooperating with the isolating lock rod and the locking push rod are respectively formed on the outer circumferences of the isolating locking plate and the earthing locking plate. A piston is arranged on the active wheel plate, one end of the piston is linked with the closing pawl of the circuit breaker, a return spring for pulling the isolating lock rod towards the active wheel plate is sleeved on the isolating lock rod, and a return spring for pulling the locking push rod towards the cam plate is sleeved on the locking push rod.

[0006] The present invention is further arranged such that the door-closing rotating shaft is arranged outside one end of the locking rotating shaft, and the door-closing rotating shaft and the locking rotating shaft are linked by meshing of bevel gears. A lock door plate is arranged on the door-closing rotating shaft.

[0007] The present invention is further arranged such that four locking grooves are arranged on both the isolating locking plate and the earthing locking plate, and the four locking grooves are arranged at equal angles of 90°.

[0008] The present invention is further arranged such that both the isolating rotating shaft and the earthing rotating shaft are hexagonal shafts, and hexagonal holes are formed at the centers of the active wheel plate, the cam plate, the isolating locking plate, and the earthing locking plate corresponding to the hexagonal shafts.

[0009] The present invention is further arranged such that a relief groove for allowing the locking rotating shaft to pass through is formed on the isolating lock rod and the locking push rod.

[0010] The present invention is further arranged such that the tripping block is a tripping bearing connected to the isolating lock rod.

[0011] The present invention is further arranged such that an isolating connecting rod is connected to the isolating rotating shaft, and the isolating rotating shaft is connected to the disconnector through the isolating connecting rod. An earthing connecting rod is connected to the earthing rotating shaft, and the earthing rotating shaft is connected to the earthing switch through the earthing connecting rod.

[0012] The present invention is further configured such that the chassis forms a link groove at the passing positions of the isolation link and the grounding link.

[0013] By collecting the opening and closing positions of the main shaft of the circuit breaker and performing an interlocking operation sequence centered on locking the closing of the circuit breaker, that is, the closing position interlocking mechanism of the circuit breaker mechanically locks the operating shafts of the isolating switch and the grounding switch, and synchronously locks the operation small door of the five-prevention interlocking mechanism, misoperation is effectively prevented. When the circuit breaker is in the open position, the unlocking mechanism operates the small door. When operating the grounding switch, the closing pawl of the circuit breaker is synchronously locked, the rotating shaft of the isolating switch is locked, and it is prevented to close the isolating switch when the grounding knife is in the closed position.

[0014] The beneficial effects of the present invention are that when the vacuum circuit breaker is closed, the isolating switch, the grounding switch and the cabinet door are locked by the five-prevention interlocking mechanism, eliminating misoperation when the vacuum circuit breaker is closed; the five-prevention interlocking mechanism is locked with the closing pawl of the vacuum circuit breaker, eliminating the potential safety hazard of misclosing when the vacuum circuit breaker is opened, with high safety; at the same time, the five-prevention interlocking switchgear has a simple structure and is convenient to install. Description of the Drawings

[0015] Figure 1 is a schematic diagram of a specific embodiment of the present invention.

[0016] Figure 2 is a schematic diagram of the five-prevention interlocking mechanism of a specific embodiment of the present invention.

[0017] Figure 3 is a schematic diagram of the cooperation of the isolation lock rod of a specific embodiment of the present invention.

[0018] Figure 4 is a schematic diagram of the cooperation of the locking push rod of a specific embodiment of the present invention.

[0019] Figure 5 is a partial enlarged view of a specific embodiment of the present invention. Detailed Embodiments

[0020] The present invention will be further described below in conjunction with the drawings.

[0021] Such as Figures 1 - 5As shown, a specific embodiment of the present invention is a five-defense interlock switch cabinet, comprising a cabinet body 50 and a vacuum circuit breaker 20, an isolating switch 30, an earthing switch 40 and a five-defense interlock mechanism 10 arranged in the cabinet body 50, wherein the five-defense interlock mechanism 10 is arranged below the vacuum circuit breaker 20, and the five-defense interlock mechanism 10 comprises a chassis 1, a door closing shaft 2, a locking shaft 3, an isolating locking rod 4, and a locking push rod 5, wherein the door closing shaft 2, the isolating locking rod 4, and the locking push rod 5 are arranged in parallel in the chassis 1, and the locking shaft 3 is perpendicular to the door closing shaft 2, the isolating locking rod 4, and the locking push rod 5 and is arranged in the chassis 1, and the locking shaft 3 is perpendicular to the door closing shaft 2, the isolating locking rod 4, and the locking push rod 5. A connecting plate 31 is arranged on the top, and the connecting plate 31 is linked to the main shaft 201 of the vacuum circuit breaker 20. A gate-breaking latch 32 is arranged at the intersection position of the locking shaft 3 with the isolation locking rod 4. A gate-breaking bearing 41 is arranged on the isolation locking rod 4 corresponding to the gate-breaking latch 32. A driving wheel plate 42 and an isolation locking plate 43 are arranged at both ends of the isolation locking rod 4. A grounding locking plate 51 and a cam plate 52 are arranged at both ends of the locking push rod 5. An isolation shaft 6 and a grounding shaft 7 are arranged in parallel on both sides of the locking shaft 3. The isolation locking plate 43 and the cam plate 52 are sleeved on the isolation shaft 6 and rotate coaxially. The driving wheel plate 42 and The grounding locking plate 51 is sleeved on the grounding rotating shaft 7 and rotates coaxially. The isolation rotating shaft 6 is connected with an isolation connecting rod 61, and the isolation rotating shaft 6 is connected to the isolation switch 30 through the isolation connecting rod 61. The grounding rotating shaft 7 is connected with a grounding connecting rod 71, and the grounding rotating shaft 7 is connected to the grounding switch 30 through the grounding connecting rod 71. The chassis 1 forms a connecting rod groove 11 at the passage of the isolation connecting rod 61 and the grounding connecting rod 71. Four locking grooves 44 that cooperate with the isolation locking rod 4 and the locking push rod 5 are arranged on the outer periphery of the isolation locking plate 43 and the grounding locking plate 51. The four locking grooves are arranged at equal angles of 90°. The driving wheel plate 42 is provided with Piston 8, piston 8 is sleeved in the piston sleeve 81 and moves up and down, the upper end of the piston 8 is linked to the closing latch of the vacuum circuit breaker, the isolation lock rod 4 is sleeved with a reset spring 9 that pulls the isolation lock rod 4 toward the active wheel plate 42, and the locking push rod 5 is sleeved with a reset spring that pulls the locking push rod 5 toward the cam plate 52. The door closing shaft 2 is arranged outside one end of the locking shaft 3, and the door closing shaft 2 and the locking shaft 3 are meshed and linked through the bevel gear. The door closing shaft 2 is provided with a door lock plate 21, and the door lock plate 21 cooperates with the door lock to achieve locking. The isolation lock rod 4 and the locking push rod 5 are formed with a clearance groove 45 for the locking shaft 3 to pass through.

[0022] The isolation rotating shaft 6 and the grounding rotating shaft 7 are both hexagonal shafts, and the centers of the driving wheel plate 42, the cam plate 52, the isolation locking plate 43 and the grounding locking plate 51 correspond to the hexagonal shafts to form hexagonal holes.

[0023] The five-prevention interlocking mechanism of the present invention is arranged below the vacuum circuit breaker and is linked with the vacuum circuit breaker through a connecting plate to collect the opening and closing positions of the main shaft of the vacuum circuit breaker. When the vacuum circuit breaker is in the closing position, the tripping pawl pushes the isolation locking rod into the locking groove of the isolation locking plate to lock the isolation rotating shaft, thereby locking the disconnecting switch connected to the isolation rotating shaft. At this time, the cam plate on the isolation rotating shaft pushes the locking push rod into the locking groove of the grounding locking plate to lock the grounding rotating shaft, thereby locking the grounding switch connected to the grounding rotating shaft. At the same time, the closing door rotating shaft is locked through the locking rotating shaft to lock the door lock plate and prevent the door from being opened, realizing the automatic locking of the disconnecting switch after closing, preventing the disconnecting switch from being pulled with load, and locking the grounding switch and the switch cabinet door panel at the same time to prevent misoperation. When the vacuum circuit breaker is in the opening position, under the action of the return spring, the isolation locking rod releases the locking of the isolation rotating shaft, enabling the disconnecting switch to be operable, and at the same time releasing the door lock; when the disconnecting switch is operated to open, the cam plate on the isolation rotating shaft rotates to release the pushing of the locking push rod, and the locking push rod releases the locking of the grounding rotating shaft under the action of the return spring, releasing the locking synchronization between the disconnecting switch and the grounding switch; when the grounding switch is operated to close, the driving wheel plate on the grounding rotating shaft pushes the piston to lock the closing pawl of the vacuum circuit breaker to prevent closing with the grounding knife, and at the same time the reset locking push rod locks the isolation knife rotating shaft through the cam plate to prevent closing the disconnecting switch with the grounding knife.

[0024] The above specific embodiments are the preferred embodiments of the present invention. Except for the above embodiments, other obvious changes of the present invention, such as the hexagonal shafts of the isolation rotating shaft and the grounding rotating shaft can be changed to any special-shaped shafts, etc., are also within the protection scope of the present invention.

Claims

1. A five-prevention interlocking switchgear cabinet, comprising a cabinet body, a vacuum circuit breaker, a disconnector, and an earthing switch arranged in the cabinet body, Characterized in that: The five-prevention interlocking switchgear cabinet further includes a five-prevention interlocking mechanism arranged below the vacuum circuit breaker. The five-prevention interlocking mechanism includes a chassis, a door-closing rotating shaft, a locking rotating shaft, an isolating lock rod, and a locking push rod. The door-closing rotating shaft, the isolating lock rod, and the locking push rod are arranged in parallel in the chassis. The locking rotating shaft is arranged perpendicular to the door-closing rotating shaft, the isolating lock rod, and the locking push rod in the chassis. A connecting plate is arranged on the locking rotating shaft and is in linkage connection with the main shaft of the vacuum circuit breaker. A tripping pawl is arranged at the intersection position of the locking rotating shaft and the isolating lock rod. A tripping block is arranged on the isolating lock rod corresponding to the tripping pawl. Active wheel plates and isolating locking plates are respectively arranged at both ends of the isolating lock rod. Earthing locking plates and cam plates are respectively arranged at both ends of the locking push rod. Isolating rotating shafts and earthing rotating shafts are respectively arranged in parallel on both sides of the locking rotating shaft. The isolating locking plate and the cam plate are sleeved on the isolating rotating shaft and rotate coaxially. The active wheel plate and the earthing locking plate are sleeved on the earthing rotating shaft and rotate coaxially. The isolating rotating shaft is in linkage connection with the disconnector, and the earthing rotating shaft is in linkage connection with the earthing switch. Locking grooves for cooperating with the isolating lock rod and the locking push rod are respectively formed on the outer peripheries of the isolating locking plate and the earthing locking plate. A piston is arranged on the active wheel plate, and one end of the piston is in linkage connection with the circuit breaker closing pawl. A return spring for pulling the isolating lock rod towards the active wheel plate is sleeved on the isolating lock rod. A return spring for pulling the locking push rod towards the cam plate is sleeved on the locking push rod; The door-closing rotating shaft is arranged outside one end of the locking rotating shaft. The door-closing rotating shaft and the locking rotating shaft are in meshing linkage through bevel gears. A lock door plate is arranged on the door-closing rotating shaft.

2. The five-prevention interlocking switchgear cabinet according to claim 1, Characterized in that: Four locking grooves are arranged on both the isolating locking plate and the earthing locking plate, and the four locking grooves are arranged at equal angles of 90°.

3. The five-prevention interlocking switchgear cabinet according to claim 1, Characterized in that: Both the isolating rotating shaft and the earthing rotating shaft are hexagonal shafts, and hexagonal holes are formed at the centers of the active wheel plate, the cam plate, the isolating locking plate, and the earthing locking plate corresponding to the hexagonal shafts.

4. The five-prevention interlocking switchgear cabinet according to claim 1, Characterized in that: Yielding grooves for allowing the locking rotating shaft to pass through are formed on the isolating lock rod and the locking push rod.

5. The five-prevention interlocking switchgear cabinet according to claim 1, Characterized in that: The tripping block is a tripping bearing connected to the isolating lock rod.

6. The five-prevention interlocking switchgear cabinet according to claim 1, Characterized in that: An isolating connecting rod is connected to the isolating rotating shaft, and the isolating rotating shaft is connected to the disconnector through the isolating connecting rod. A grounding connecting rod is connected to the grounding rotating shaft, and the grounding rotating shaft is connected to the grounding switch through the grounding connecting rod.

7. The five-prevention interlocking switchgear cabinet according to claim 1, Characterized in that: The chassis forms a connecting rod groove at the passing positions of the isolating connecting rod and the grounding connecting rod.

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