A five-protection mechanical interlocking structure for upper isolating switch cabinet

Abstract

The invention discloses a five-defense mechanical interlocking structure used in an upper isolating switch cabinet, including a reset base, an interlocking plate, a fixed bracket, a fixing screw, a limit block, a circuit breaker indication interlocking limit block, a circuit breaker indication rotating shaft, an isolating connecting rod, a grounding connecting rod, an isolating welding baffle, an isolating fixed rotating shaft, a grounding welding baffle, a grounding fixed rotating shaft and an isolating grounding indication interlocking plate. The isolating grounding indication interlocking plate is conducive to its own appearance design, the isolating welding baffle and the grounding welding baffle are linked with the circuit breaker indication interlocking limit block through the isolating connecting rod and the grounding connecting rod, the limit block and the limit dial block in the circuit breaker indication interlocking limit block are bent to form an interlocking relationship with the interlocking plate, the interlocking plate is interlocked with the lower door of the cable room through the reset base, and the four-block combination realizes the five-defense interlocking function. The invention has reliable performance and simple assembly, fully meets the five-defense interlocking performance requirements, greatly improves the safety of the switch cabinet equipment, and is more conducive to the safety of the power system and operators.

Description

Technical field:

[0001] The invention relates to the technical field of switch cabinets, in particular to a five-protection mechanical interlocking structure of an upper isolating switch cabinet. Technical background:

[0002] The five-defense system is the main equipment for preventing misoperation in substations, ensuring the safe operation of substations and preventing human misoperation. Any normal switching operation must go through the simulation rehearsal and logical judgment of the five-defense system. Therefore, ensuring the integrity and perfection of the five-defense system can greatly prevent and reduce the occurrence of power grid accidents. With the development of the power grid, the increasing power consumption of users, the reliability requirements of power supply to users are getting higher and higher, and the role of the five-defense system has become more important.

[0003] The specific requirements of the five protections are: 1. Preventing the circuit breaker from opening or closing by mistake; 2. Preventing the disconnector from opening or closing with load; 3. Preventing the grounding wire (grounding switch) from being hung (closed) with power on; 4. Preventing power transmission with the grounding wire; 5. Preventing entering the live interval by mistake. Only when the above requirements are met can a complete set of five protection mechanical interlocking structures be established.

[0004] Most of the existing five-protection interlocking solutions have complex structures, or a wide variety of parts, or a complex or difficult assembly process. Summary of the invention:

[0005] In order to overcome the problems of complex structure, many types of parts, or complex or difficult assembly process in the prior art, the purpose of the present invention is to provide a five-protection mechanical interlocking structure of an upper isolating switch cabinet to reduce the number of interlocking components, simplify the assembly process, and reliably achieve the five-protection interlocking performance requirements.

[0006] The specific technical solution of the present invention is: a five-protection mechanical interlocking structure of an upper isolating switch cabinet, including a reset base, an interlocking plate, a fixed bracket, a fixing screw, a limit block, a circuit breaker indication interlocking limit block, a circuit breaker indication rotating shaft, an isolating connecting rod, a grounding connecting rod, an isolating welding baffle, an isolating fixed rotating shaft, a grounding welding baffle, a grounding fixed rotating shaft and an isolating grounding indication interlocking plate. The reset base is fixed to the bottom plate of the mechanism chamber and is connected and fixed with the interlocking plate by screws. The fixed bracket is fixed to the circuit breaker mechanism by screws and springs and flat washers. The interlocking plate is connected to the circuit breaker mechanism by the fixed bracket and the fixing screws. The circuit breaker indicating shaft is installed on the circuit breaker mechanism. The first connecting shaft sleeve in the circuit breaker indicating interlocking limit block is fitted with the circuit breaker indicating shaft and fixed with screws. The isolation fixed shaft is fixed to the required position of the isolation and grounding three-position mechanism. The second connecting shaft sleeve in the isolation welding baffle is fitted with the isolation fixed shaft and fixed with a shaft retaining ring. The grounding fixed shaft is fixed to the required position of the isolation and grounding three-position mechanism. The third connecting shaft sleeve in the grounding welding baffle is fitted with the isolation fixed shaft and fixed with a shaft retaining ring. The isolation and grounding indication interlocking plate is fixed to the indicating shaft of the isolation and grounding three-position mechanism with screws. The isolating connecting rod is an arc-shaped connecting rod, which connects the third welding pin in the isolating welding baffle with the second welding pin in the circuit breaker indication interlocking limit block through openings at both ends, and is fixed with a shaft retaining ring. The grounding connecting rod is a straight rod, which connects the fourth welding pin in the grounding welding baffle with the first welding pin in the circuit breaker indication interlocking limit block through openings at both ends, and is fixed with a shaft retaining ring. The limit block and the grounding operation main shaft are fitted at the required angle and are fixed with elastic cylindrical pins. The limit block has a limit and unlock relationship with the interlocking plate.

[0007] Furthermore, the interlocking plate is provided with openings of different shapes, which are assembled with the opening and closing knobs of the circuit breaker mechanism. The knob mounting pillar passes through the opening of the interlocking plate, and the knob is installed on the outside of the interlocking plate. When the square part of the opening rotating shaft is in the square groove part of the special-shaped hole, the opening operation cannot be performed. The interlocking plate has two short bends in different directions, which are respectively in contact with the limit block and the circuit breaker indicator interlocking limit block, and are used as limit points. The interlocking plate is provided with a sliding groove, which is connected to the fixed bracket by a fixing screw to ensure that the interlocking plate moves in the designed direction.

[0008] Furthermore, the circuit breaker indication interlock limit block is a welded part, wherein the first connecting sleeve is a special-shaped hole sleeve, and a corresponding special-shaped hole is opened at the bottom end of the limit block. By adjusting the angle of the special-shaped hole and the relative angle between the limit block and the status indication plate, the desired rotation angle and limit displacement can be achieved.

[0009] Furthermore, the circuit breaker indicating shaft can be directly fixed on the circuit breaker mechanism according to the designed position.

[0010] Furthermore, the isolation fixed shaft, the grounding fixed shaft and the isolation grounding indication interlock plate can be directly assembled and fixed on the isolation grounding three-position mechanism as a whole with the mechanism.

[0011] Furthermore, the isolation welding baffle and the grounding welding baffle can be assembled as a whole with the isolation and grounding three-station mechanism, or can be assembled separately.

[0012] Furthermore, the isolation welding baffle and the grounding welding baffle are both welded parts, wherein the isolation baffle and the isolation base, the grounding baffle and the grounding base are provided with special-shaped holes, which are respectively mounted on both ends of the second connecting sleeve and the third connecting sleeve. By adjusting the angle of the special-shaped hole of the part, the relative angle between each baffle and each base plate is adjusted, thereby controlling the rotation angle of the isolation welding baffle and the grounding welding baffle along with the circuit breaker indication interlocking limit block.

[0013] Furthermore, the isolation connecting rod is an arc-shaped connecting rod, and the arc-shaped part is a yielding part to prevent interference during operation. Description of the drawings:

[0014] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is a schematic diagram of the structure of the present invention, showing the interlocking state when the switch is in the overall open position.

[0016] In the figure: 1 reset base, 2 interlock plate, 3 fixed bracket, 4 fixing screw, 5 limit block, 6 circuit breaker indication interlock limit block, 7 isolation rod, 8 grounding rod, 9 isolation welding baffle, 10 grounding welding baffle, 11 circuit breaker indication shaft, 12 isolation grounding indication interlock plate, 13 isolation fixed shaft, 14 grounding fixed shaft.

[0017] Figure 2 It is a detailed schematic diagram of the reset base 1.

[0018] 1-1 is the base assembly, 1-2 is the first elastic cylindrical pin, 1-3 is the return spring, and 1-4 is the support rod.

[0019] Figure 3 It is a detailed schematic diagram of the interlocking plate 2.

[0020] Among them, 2-1 is the opening limit hole, 2-2 is the closing knob clearance hole, 2-3 is the guide groove, 2-4 is the bend at the grounding spindle limit, and 2-5 is the bend at the circuit breaker indication limit.

[0021] Figure 4 It is a schematic diagram of the welding appearance of the circuit breaker indicator interlock limit block 6.

[0022] Among them, 6-1 is a status indicator plate, 6-2 is a first connecting sleeve, 6-3 is a limit switch block, 6-4 is an indicator base, 6-5 is a first welding pin, and 6-6 is a second welding pin.

[0023] Figure 5 It is a schematic diagram of the isolation welding baffle 9.

[0024] Among them, 9-1 is an isolation baffle, 9-2 is a second connecting sleeve, 9-3 is an isolation bottom plate, and 9-4 is a third welding pin.

[0025] Figure 6 FIG. 1 is a schematic diagram of a ground welding baffle 10 .

[0026] 10 - 1 is a grounding baffle, 10 - 2 is a third connecting sleeve, 10 - 3 is a grounding base plate, and 10 - 4 is a fourth welding pin. Specific implementation method:

[0027] The following is a specific and detailed introduction to the embodiments of the present invention. Contents not described in detail are well known to professionals in the field. This example is only one of the feasible embodiments of the present scheme. Based on this example, other examples obtained by ordinary technicians in the field without creative work are all within the scope of protection of the present invention.

[0028] Reference Figure 1 The state and position shown, the specific implementation method of the present invention is: a five-protection mechanical interlocking structure of an upper isolating switch cabinet, including a reset base 1, an interlocking plate 2, a fixed bracket 3, a fixing screw 4, a limit block 5, a circuit breaker indication interlocking limit block 6, an isolating connecting rod 7, a grounding connecting rod 8, an isolating welding baffle 9, a grounding welding baffle 10, a circuit breaker indication shaft 11, an isolating grounding indication interlocking plate 12, an isolating fixed shaft 13, and a grounding fixed shaft 14.

[0029] The reset base 1 is fixed to the bottom plate of the mechanism room, and the interlock plate 2 is connected and fixed to the reset base 1 by screws. The fixed bracket 3 is fixed to the appropriate position of the circuit breaker mechanism by screws, springs, and flat washers. The guide groove 2-3 on the interlock plate 2 is connected to the circuit breaker mechanism by the fixed bracket 3 and the fixed screw 4. The interlock plate 2 has openings and bends of different shapes, a switch-off limit hole 2-1, a closing knob clearance hole 2-2, a guide groove 2-3, a bend 2-4 at the grounding spindle limit, and a bend 2-5 at the circuit breaker indication limit. The switch-off limit hole 2-1 and the closing knob clearance hole 2-2 in the interlock plate 2 are set with the switch-off and closing knobs of the circuit breaker mechanism. The knob installation pillar passes through the switch-off limit hole 2-1 and the closing knob clearance hole 2-2 in the opening of the interlock plate 2, and the knob is installed on the outside of the interlock plate. The reset base 1, interlock plate 2, fixed bracket 3, and fixed screw 4 are fixed.

[0030] The lower ends of the component support rods 1-4 in the reset base 1 are provided with an annular groove, which cooperates with the cable room door slot to realize the interlocking of the closing and closing of the cable room door by each interlock.

[0031] The isolation fixed rotating shaft 13 and the grounding fixed rotating shaft 14 are fixed at the positions required by the design of the isolation and grounding three-position mechanism. The isolation welding baffle 9 is a welding part, and the second connecting shaft sleeve 9-2 inside it has a circular hole and is fitted with the isolation fixed rotating shaft 13, and is fixed with a shaft retaining ring φ8. The grounding welding baffle 10 is a welding part, and the third connecting shaft sleeve 10-2 inside it has a circular hole and is fitted with the grounding fixed rotating shaft 14, and is fixed with a shaft retaining ring φ8. The isolation and grounding indication interlocking plate 12 is fixed to the indication rotating shaft of the isolation and grounding three-position mechanism with screws, and rotates synchronously with the indication rotating shaft, and the final rotation position of the isolation and grounding indication interlocking plate 12 can cover the isolation or grounding operating spindle at the other end, so as to realize the interlocking function of the isolation and grounding mechanism itself.

[0032] The circuit breaker indicating shaft 11 is fixed on the circuit breaker mechanism, the circuit breaker indicating interlocking limit block 6 is a welded part, including a status indicating plate 6-1, a first connecting sleeve 6-2, a limit block 6-3, an indicating base 6-4, a first welding pin 6-5, and a second welding pin 6-6. The axial shaped hole of the first connecting sleeve 6-2 in the circuit breaker indicating interlocking limit block 6 is fitted with the circuit breaker indicating shaft 11, and is fixed with screws through the radial circular hole on the first connecting sleeve 6-2 and the threaded hole on the circuit breaker indicating shaft 11. The isolating link 7 is connected to the third welding pin 9-4 of the parts in the isolating welding baffle 9 and the second welding pin 6-6 of the circuit breaker indication interlocking limit block 6 through the openings at both ends, and is fixed with a shaft retaining ring φ6. The isolating link 7 is an arc-shaped link, and the arc position is used as a clearance space to prevent interference during operation. The grounding link 8 is connected to the fourth welding pin 10-4 of the parts in the grounding welding baffle 10 and the first welding pin 6-5 of the parts of the circuit breaker indication interlocking limit block 6 through the openings at both ends, and is fixed with a shaft retaining ring φ6. The rotational movement of the circuit breaker indication interlocking limit block 6 generated by the change of the circuit breaker opening and closing state drives the isolating welding baffle 9 and the grounding welding baffle 10 to rotate through the isolating link 7 and the grounding link 8, so as to realize the shielding or unlocking of the isolation and grounding operation main shafts by the isolating welding baffle 9 and the grounding welding baffle 10, so as to realize the interlocking function of the circuit breaker mechanism and the isolation and grounding three-position mechanism. At the same time, the limit shift block 6-3 in the circuit breaker indicating interlock limit block 6 rotates, so that the limit shift block 6-3 switches the limit and unlock state of the interlock plate 2, and realizes the interlocking function of the circuit breaker mechanism for the lower door.

[0033] When the isolation and grounding three-position mechanism is in the open state, the limit block 5 is assembled at the position where the reset base 1 is in the closed lower door assembly state, so that the limit block 5 contacts the bend 2-4 at the limit position of the grounding spindle of the interlocking plate 2 and is fixed with an elastic cylindrical pin. The limit block 5 rotates synchronously with the grounding operation spindle.

[0034] The specific working principle is: Figure 1 As shown, the circuit breaker and the isolation grounding three-position mechanism are both in the open state. At this time, the limit block 5 and the part limit shift block 6-3 in the circuit breaker indication interlock limit block 6 limit the interlock plate 2, making the cable room door unable to be opened.

[0035] by Figure 1The state shown is the initial state. If the switch cabinet needs to be repaired, the operation sequence is: first rotate the grounding operation spindle, the grounding circuit is closed, the limit block 5 rotates synchronously with the grounding operation spindle, and the limit block 5 opens the limit of the bend 2-4 of the grounding spindle limit of the interlocking plate 2, and then operate the circuit breaker mechanism to store energy and perform the closing operation. As the circuit breaker is closed, the part limit shift block 6-3 in the circuit breaker indication interlock limit block 6 opens the limit of the bend 2-5 of the circuit breaker indication limit in the interlocking plate 2. At this time, the interlocking plate 2 is in a fully unlocked state. As the lower door of the cable room is opened, the interlocking plate 2 moves upward under the action of the reset spring 1-3 in the reset base 1, and finally the lower elastic cylinder in the reset base 1 The movement of the pin 1-2 stops under the action of the pin 1-2. At this time, the square part of the circuit breaker opening knob operating shaft is in the square groove of the opening limit hole 2-1 of the interlocking plate 2. The square groove part of the opening limit hole 2-1 of the interlocking plate 2 limits the operation of the opening knob, so that the circuit breaker cannot be opened. At the same time, the rotation of the circuit breaker indication interlock limit block 6 drives the isolation welding baffle 9 and the grounding welding baffle 10 to rotate simultaneously through the isolation connecting rod 7 and the grounding connecting rod 8. The isolation baffle 9-1 and the grounding baffle 10-1 simultaneously block the isolation and grounding operating spindles of the isolation and grounding three-position mechanism, so that when the circuit breaker is in the closed state, the isolation and grounding three-position mechanism cannot be operated, ensuring that the equipment is reliably grounded during the opening of the lower door of the cable room to prevent misoperation.

[0036] After the maintenance is completed, the power supply operation is as follows: close the lower door of the cable room, and the card slot at the upper end of the lower door of the cable room drives the support rod 1-4 to move downward, and at the same time drives the interlocking plate 2 to move downward, and the opening limit hole 2-1 moves downward, so that the circuit breaker opening operation shaft is out of the square slot of the opening limit hole 2-1. At this time, the circuit breaker opening operation can be performed. After the circuit breaker is opened, the limit shift block 6-3 forms a limit on the interlocking plate 2, so that the lower door of the cable room cannot be opened. At the same time, as the circuit breaker is opened, the circuit breaker indication interlock limit block 6 drives the isolation welding baffle 9 and the grounding welding baffle 10 to rotate simultaneously through the isolation connecting rod 7 and the grounding connecting rod 8. The isolation baffle 9-1 and the grounding baffle 10-1 simultaneously release the restrictions on the isolation and grounding operation spindles of the isolation and grounding three-position mechanism, so that the isolation and grounding three-position mechanism can perform opening and closing operations, separate the grounding circuit, and the limit block 5 is restored. Figure 1 In the state shown, the interlock plate 2 is bent at the grounding main shaft limit position 2-4 to form a limit. The isolation main shaft is operated to close the isolation switch, and then the circuit breaker mechanism is charged and closed, and the main circuit is closed.

[0037] The present invention has reliable performance, complete functions, clear hierarchy, and is simple and easy to understand.

[0038] Some parts of the present invention can be solidified with the mechanism as one body, thus reducing the number of assembly parts.

[0039] The invention has adjustability and can be fine-tuned within a certain range according to travel requirements.

[0040] The above is a specific embodiment of the present invention, and this example is one of the best embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A five-protection mechanical interlocking structure of an upper isolating switch cabinet, comprising a reset base (1), an interlocking plate (2), a fixing bracket (3), a fixing screw (4), a limit block (5), a circuit breaker indication interlocking limit block (6), an isolating connecting rod (7), a grounding connecting rod (8), an isolating welding baffle (9), a grounding welding baffle (10), a circuit breaker indication rotating shaft (11), an isolating grounding indicating interlocking plate (12), an isolating fixed rotating shaft (13), and a grounding fixed rotating shaft (14), characterized in that: The reset base (1) is fixed to the bottom plate of the mechanism chamber and connected and fixed to the interlocking plate (2) by screws; the fixed bracket (3) is fixed to the circuit breaker mechanism by screws and springs and flat washers; the interlocking plate (2) is connected to the circuit breaker mechanism by the fixed bracket (3) and the fixing screws (4); the circuit breaker indicating shaft (11) is installed on the circuit breaker mechanism; the circuit breaker indicating interlocking limit block (6) is fitted with the circuit breaker indicating shaft (11) by a first connecting sleeve (6-2) and fixed by screws; the isolation fixed shaft (13) is fixed to the required position of the isolation grounding three-position mechanism; the isolation welding baffle (9) is fitted with the isolation fixed shaft (13) by a second connecting sleeve (9-2) and fixed by a shaft retaining ring; the grounding fixed shaft (14) is fixed to the required position of the isolation grounding three-position mechanism; the grounding welding baffle (10) is mounted on the grounding fixed shaft (14) through the third connecting shaft sleeve (10-2) and fixed with a shaft retaining ring. The isolation grounding indication interlocking plate (12) is fixed on the isolation grounding three-position mechanism indication shaft with screws. The isolation connecting rod (7) is an arc-shaped connecting rod. The third welding pin (9-4) in the isolation welding baffle (9) and the second welding pin (6-6) in the circuit breaker indication interlocking limit block (6) are connected through openings at both ends and fixed with a shaft retaining ring. The grounding connecting rod (8) is connected to the fourth welding pin (10-4) in the grounding welding baffle (10) and the first welding pin (6-5) in the circuit breaker indication interlocking limit block (6) through openings at both ends and fixed with a shaft retaining ring. The limit block (5) and the grounding operation main shaft are mounted at a required angle and fixed with an elastic cylindrical pin. The limit block (5) has a limiting and unlocking relationship with the interlocking plate (2).

2. The five-protection mechanical interlocking structure of the upper isolating switch cabinet according to claim 1 is characterized in that: The interlocking plate (2) is provided with openings and bends of different shapes, including: a switch-off limit hole (2-1), a switch-on knob clearance hole (2-2), a guide groove (2-3), a grounding spindle limit bend (2-4), and a circuit breaker indication limit bend (2-5). The switch-off limit hole (2-1) and the square groove portion form a limit with the square portion of the circuit breaker switch-off rotating shaft, so that the switch-off operation cannot be performed.

3. The five-protection mechanical interlocking structure of the upper isolating switch cabinet according to claim 1 is characterized in that: The circuit breaker indicating interlocking limit block (6) is a welded component, comprising a state indicating plate (6-1), a first connecting shaft sleeve (6-2), a limit shifting block (6-3), an indicating base (6-4), a first welding pin (6-5), a second welding pin (6-6), the state indicating plate (6-1), the limit shifting block (6-3), and the indicating base (6-4), all of which have special-shaped openings and are assembled with the first connecting shaft sleeve (6-2). By adjusting the angle of the special-shaped opening of the limit shifting block (6-3), the relative angle between the limit shifting block (6-3) and the state indicating plate (6-1) is adjusted to achieve a desired rotation angle and limit displacement.

4. The five-protection mechanical interlocking structure of the upper isolation switch cabinet according to claim 1 is characterized in that: The isolating connecting rod (7) is an arc-shaped connecting rod with holes at both ends. The arc-shaped position serves as a clearance space to prevent interference during operation. The holes at both ends are used to achieve connection with the third welding pin (9-4) on the isolating welding baffle (9) and the second welding pin (6-6) on the circuit breaker indication interlocking limit block (6).

5. The five-protection mechanical interlocking structure of the upper isolating switch cabinet according to claim 1 is characterized in that: The isolation welding baffle (9) is a welding part, comprising an isolation baffle (9-1), a second connecting shaft sleeve (9-2), an isolation bottom plate (9-3), and a third welding pin (9-4). The isolation baffle (9-1) and the isolation bottom plate (9-3) are both provided with special-shaped holes, which are fitted on both ends of the second connecting shaft sleeve (9-2). The relative angle between the isolation baffle (9-1) and the isolation bottom plate (9-3) is adjusted by adjusting the angle of the special-shaped holes.

6. The five-protection mechanical interlocking structure of the upper isolating switch cabinet according to claim 1 is characterized in that: The grounding welding baffle (10) is a welding part, comprising a grounding baffle (10-1), a third connecting shaft sleeve (10-2), a grounding bottom plate (10-3), and a fourth welding pin (10-4); the grounding baffle (10-1) and the grounding bottom plate (10-3) are both provided with special-shaped holes, which are fitted on both ends of the connecting shaft sleeve (10-2); and the relative angle between the grounding baffle (10-1) and the grounding bottom plate (10-3) is adjusted by adjusting the angle of the special-shaped holes.

7. A five-protection mechanical interlocking structure of an upper isolating switch cabinet according to claim 1 or claim 2 or claim 3, characterized in that: The interlocking plate (2) is provided with a grounding spindle limit bend (2-4) and a circuit breaker indication limit bend (2-5), which respectively form limits with a limit block (5) and an upper limit shift block (6-3) of a circuit breaker indication interlocking limit block (6) to control the closing operation of the lower door of the cable chamber.

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