Load switch and circuit breaker interlocking device

Abstract

The invention relates to high-voltage switch cabinet equipment of a power system, in particular to an interlocking device of a load switch and a circuit breaker, which comprises a cam, a first pressing plate, a pressing rod and a second pressing plate, a reset device is arranged on the second pressing plate, the cam is connected to an indicating shaft, the first pressing plate is connected to one end of the pressing rod, and the second pressing plate is connected to the other end of the pressing rod. The second pressing plate is connected to the other end of the pressing rod, when the load switch is switched from a switching-on state to a switching-off state and from a grounding state to the switching-off state, the indicating shaft drives the cam to press downwards on the first pressing plate, the second pressing plate and the interior of the circuit breaker are interlocked, and the second pressing plate and the circuit breaker are interlocked. When the load switch is switched from an opening state to a closing state and the load switch is switched from the opening state to a grounding state, the indicating shaft drives the cam to leave the first pressing plate, and the circuit breaker can be switched on. The invention relates to high-voltage switch cabinet equipment of a power system, which is simple in structure, convenient to operate and reliable in performance.

Description

Technical Field

[0001] The invention relates to a high-voltage switch cabinet device of an electric power system, in particular to an interlocking device of a load switch and a circuit breaker. Background Art

[0002] In the substation where the power system is operating, the operation of the isolating switches, circuit breakers, and earthing switches of the high-voltage switchgear and the opening of the cabinet doors usually need to meet the "five-protection" interlocking requirements. The "five protections" refer to: preventing the isolating switches from being opened and closed under load; preventing the circuit breakers from being opened and closed by mistake; preventing the isolating switches from being closed with the ground wire; preventing the ground wire from being hung with power on; and preventing entering the live interval by mistake.

[0003] Therefore, how to effectively realize the "five-protection" interlocking function of the load switch to eliminate potential safety hazards is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an interlocking device for a load switch and a circuit breaker, which has a simple structure, convenient operation and reliable performance, and can close the circuit breaker only after the load switch is opened and the circuit breaker cannot be closed.

[0005] In order to solve the above technical problems, this application provides the following technical solutions:

[0006] The interlocking device of the load switch and the circuit breaker of the present invention, the load switch includes a load switch operating mechanism, the load switch operating mechanism is provided with an indicating shaft, the indicating shaft can be rotatably connected to the load switch operating mechanism bracket, including a cam, a first pressure plate, a pressure rod, and a second pressure plate, the second pressure plate is connected with a reset device, the cam is connected to the indicating shaft, the first pressure plate is connected to one end of the pressure rod, the second pressure plate is connected to the other end of the pressure rod, the first pressure plate is horizontally arranged, the second pressure plate is tilted upward, the pressure rod is vertically arranged, the first pressure plate is located below the cam, when the load switch changes from the closed state to the open state, the indicating shaft drives the cam to rotate 60° clockwise, and the load switch changes from the grounded state to the open state When the load switch is in the closed state, the indicating shaft drives the cam to rotate 60° counterclockwise. When the load switch changes from the closed state to the open state and from the grounded state to the open state, the indicating shaft drives the cam to press downward on the first pressure plate. The first pressure plate drives the pressure rod and the second pressure plate to move downward. The second pressure plate is interlocked with the circuit breaker, and the circuit breaker cannot be closed. When the load switch changes from the open state to the closed state and from the open state to the grounded state, the indicating shaft drives the cam to leave the first pressure plate. Under the action of the resetting device, the second pressure plate drives the first pressure plate, the pressure rod and the second pressure plate to reset upward. The interlock between the second pressure plate and the circuit breaker is released, and the circuit breaker can be closed.

[0007] Furthermore, the pressure rod includes a first pressure rod unit, a second pressure rod unit, and a third pressure rod unit. One end of the first pressure rod unit is connected to the first pressure plate, and the other end is connected to one end of the second pressure rod unit. One end of the third pressure rod unit is connected to the second pressure plate, and the other end is connected to the other end of the second pressure rod unit.

[0008] Furthermore, it also includes a first guide bracket, which includes two guide plates parallel to each other, and the two guide plates are both connected to the load switch operating mechanism bracket. The two guide plates are both provided with a first through hole, and the first pressure rod unit passes through the first through hole in sequence.

[0009] Further, it is characterized in that it also includes a second guide bracket, the second guide bracket includes two guide plates parallel to each other, the two guide plates of the second guide bracket are both connected to the cabinet of the load switch, the two guide plates of the second guide bracket are both provided with second through holes, and the second pressure rod units pass through the second through holes in sequence.

[0010] Furthermore, the first pressure rod unit and the second pressure rod unit, and the second pressure rod unit and the third pressure rod unit are all connected by bolts.

[0011] Furthermore, the first pressure rod unit is a straight rod, and the second pressure rod unit and the third pressure rod unit are both L-shaped rods.

[0012] Furthermore, it also includes a limit plate, which is connected to the load switch operating mechanism bracket and is located below the second pressure rod unit. When the cam presses the first pressure plate downward to move the first pressure plate down to the position, the second pressure rod unit abuts against the limit plate.

[0013] Furthermore, the limit plate is an L-shaped plate, a limit groove is formed between the limit plate and the load switch operating mechanism bracket, and the second pressure rod unit is located in the limit groove.

[0014] Furthermore, it also includes a rotating rod, the second pressure plate is connected to one end of the rotating rod, the circuit breaker is provided with a circuit breaker connecting rod and a middle pressure plate, the middle pressure plate is connected to the middle of the rotating rod, the reset device is a reset spring, the reset spring is arranged on the circuit breaker connecting rod, the top of the circuit breaker connecting rod is connected to the middle pressure plate, and the bottom is used to connect the internal connecting plate of the circuit breaker, and when the second pressure plate moves downward into place, the bottom of the circuit breaker connecting rod presses against the internal connecting plate of the circuit breaker.

[0015] Compared with the prior art, the interlocking device of the load switch and the circuit breaker of the present invention has at least the following beneficial effects:

[0016] The interlocking device of the load switch and the circuit breaker of the present invention comprises a cam, a first pressure plate, a pressure rod and a second pressure plate, the cam is connected to the indicating shaft, the cam and the indicating shaft rotate synchronously, and the cam can be driven to rotate by the indicating shaft to realize the interlocking and releasing of the circuit breaker during the process of opening, closing and grounding of the load switch. The operation is convenient and the structure is simple. The three-position load switch is used to ensure that the circuit breaker can be closed only after closing or grounding, and the circuit breaker cannot be closed when opening, which is safer.

[0017] The interlocking device of the load switch and the circuit breaker of the present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the interlocking device of the load switch and the circuit breaker of the present invention;

[0019] Figure 2 The figure is a side structural schematic diagram of the interlocking device of the load switch and the circuit breaker of the present invention. DETAILED DESCRIPTION

[0020] like Figure 1 , Figure 2As shown, the load switch includes a load switch operating mechanism 21, and an indication shaft 22 is provided on the load switch operating mechanism 21. The indication shaft 22 can be rotatably connected to the load switch operating mechanism bracket 23. The indication shaft 22 rotates to realize the closing, opening and grounding of the load switch. The interlocking device of the load switch and the circuit breaker of the present invention includes a cam 11, a first pressure plate 12, a pressure rod 13, and a second pressure plate 14. The cam 11 is connected to the indication shaft 22. The cam 11 rotates synchronously with the indication shaft 22. The first pressure plate 12 is connected to one end of the pressure rod 13, and the second pressure plate 14 is connected to the other end of the pressure rod 13. The first pressure plate 12 is horizontally arranged, and the second pressure plate 14 is tilted upward. The second pressure plate 14 is connected to a reset device, and the pressure rod 13 is vertically arranged. The first pressure plate 12 is located below the cam 11. Figure 1The figure shows the load switch in the open state. When the load switch changes from the closed state to the open state, the indicating shaft 22 drives the cam 11 to rotate 60° clockwise. When the load switch changes from the grounded state to the open state, the indicating shaft 22 drives the cam 11 to rotate 60° counterclockwise. When the load switch changes from the closed state to the open state and when the load switch changes from the grounded state to the open state, the indicating shaft 22 drives the cam 11 to press downward on the first pressure plate 12. The first pressure plate 12 drives the pressure rod 13 and the second pressure plate 14 to move downward. The second pressure plate 14 reaches the position shown in the figure. The second pressure plate 14 is internally interlocked with the circuit breaker 31, and the circuit breaker 31 cannot be closed. Specifically, it also includes a rotating rod 313, the second pressure plate 14 is connected to one end of the rotating rod 313, the middle pressure plate 312 is connected to the middle of the rotating rod 313, the top of the circuit breaker connecting rod 311 is connected to the middle pressure plate 312, and the bottom is used to connect to the internal connecting plate of the circuit breaker. When the second pressure plate 14 moves downward, it drives the rotating rod 313 to rotate and drives the middle pressure plate 312 of the circuit breaker 31 to press down synchronously. The middle pressure plate 312 of the circuit breaker 31 drives the circuit breaker connecting rod 311 to move downward. The circuit breaker connecting rod 311 moves downward and presses against the internal connecting plate of the circuit breaker. The internal connecting plate presses against the closing button of the circuit breaker, and the circuit breaker 31 cannot be closed. The reset device is a reset spring 314, which is arranged on the circuit breaker connecting rod 311. When the load switch changes from the opening state to the closing state and from the opening state to the grounding state, the indicating shaft 22 drives the cam 11 to leave the first pressure plate 12. Under the action of the reset spring 314, the circuit breaker connecting rod 311 moves upward and drives the second pressure plate 14 to move upward. The second pressure plate 14 drives the first pressure plate 12 and the pressure rod 13 to reset upward. The circuit breaker connecting rod 311 no longer presses against the internal connecting plate of the circuit breaker. The internal interlock of the circuit breaker is released, and the circuit breaker can be closed. The present invention discloses an interlocking device for a load switch and a circuit breaker. The interlocking device comprises a cam 11, a first pressure plate 12, a pressure rod 13 and a second pressure plate 14. The cam 11 is connected to an indicating shaft 22. The cam 11 and the indicating shaft 22 rotate synchronously. In the process of opening, closing and grounding of the load switch, the cam 11 can be driven to rotate by the indicating shaft 22 to realize interlocking and releasing of the circuit breaker. The device has convenient operation and simple structure. The device is used for a three-position load switch to ensure that the circuit breaker can be closed only after closing or grounding, and the circuit breaker cannot be closed when opening, which is safer.

[0021] Optionally, the pressure rod 13 includes a first pressure rod unit 131, a second pressure rod unit 132, and a third pressure rod unit 133. One end of the first pressure rod unit 131 is connected to the first pressure plate 12, and the other end is connected to one end of the second pressure rod unit 132. One end of the third pressure rod unit 133 is connected to the second pressure plate 14, and the other end is connected to the other end of the second pressure rod unit 132.

[0022] Optionally, a first guide bracket 15 is further included, the first guide bracket 15 includes two guide plates parallel to each other, both guide plates are connected to the load switch operating mechanism bracket 23, both guide plates are provided with first through holes, and the first pressure rod unit 131 passes through the first through holes on the two guide plates. Since the first pressure rod unit 131 passes through the first through hole on the first guide bracket 15, the first pressure rod unit 131 is prevented from deflecting during the up and down movement, so that the interlocking device of the load switch and the circuit breaker of the present invention has stable and reliable performance.

[0023] Optionally, a second guide bracket 16 is further included, and the second guide bracket 16 includes two guide plates parallel to each other, both guide plates are connected to the cabinet 41 of the load switch, and both guide plates are provided with second through holes, and the second pressure rod unit 132 passes through the second through holes of the two guide plates. Since the second pressure rod unit 132 passes through the second through holes on the second guide bracket 16, the second pressure rod unit 132 is further prevented from being offset during the up and down movement.

[0024] Optionally, the first compression rod unit 131 and the second compression rod unit 132 , and the second compression rod unit 132 and the third compression rod unit 133 are all connected by bolts.

[0025] Optionally, the first pressure rod unit 131 is a straight rod, and the second pressure rod unit 132 and the third pressure rod unit 133 are both L-shaped rods.

[0026] Optionally, a limit plate 17 is further included, the limit plate 17 is connected to the load switch operating mechanism bracket 23, the limit plate 17 is located below the second pressure rod unit 132, when the load switch is opened, the indication shaft 22 drives the cam 11 to rotate, and the cam 11 presses downward on the first pressure plate 12, when the load switch is opened, the first pressure plate 12 moves downward into position, and the second pressure rod unit 132 abuts against the limit plate 17. The limit plate 17 is provided to prevent the second pressure rod unit 132 from excessively moving downward and causing damage to the circuit breaker. Specifically, the limit plate 17 is an L-shaped plate, and a limit groove is formed between the limit plate 17 and the load switch operating mechanism bracket 23 to prevent the second pressure rod unit 132 from shaking and slipping and losing the limiting function.

[0027] The implementation described above is only a description of the preferred implementation mode of the present invention, and does not limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solution of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. An interlocking device for a load switch and a circuit breaker, the load switch comprising a load switch operating mechanism (21), the load switch operating mechanism (21) being provided with an indication shaft (22), the indication shaft (22) being rotatably connected to a load switch operating mechanism bracket (23), characterized in that: The invention comprises a cam (11), a first pressure plate (12), a pressure rod (13), and a second pressure plate (14), wherein the second pressure plate (14) is connected to a reset device, the cam (11) is connected to the indicating shaft (22), the first pressure plate (12) is connected to one end of the pressure rod (13), the second pressure plate (14) is connected to the other end of the pressure rod (13), the first pressure plate (12) is arranged horizontally, the second pressure plate (14) is arranged upwardly tilted, the pressure rod (13) is arranged vertically, the first pressure plate (12) is located below the cam (11), when the load switch changes from a closed state to an open state, the indicating shaft (22) drives the cam (11) to rotate 60° clockwise, when the load switch changes from a grounded state to an open state, the indicating shaft (22) drives the cam (11) to rotate 60° counterclockwise, and the load switch changes from a closed state to an open state. When the load switch is in the switched state and when the load switch is in the switched state from the grounded state to the switched open state, the indicating shaft (22) drives the cam (11) to press downward on the first pressing plate (12), the first pressing plate (12) drives the pressing rod (13) and the second pressing plate (14) to move downward, the second pressing plate (14) and the circuit breaker (31) are internally interlocked, and the circuit breaker (31) cannot be closed. When the load switch is in the switched state from the switched open state to the switched closed state and when the load switch is in the switched state from the switched open state to the grounded state, the indicating shaft (22) drives the cam (11) to leave the first pressing plate (12), under the action of the resetting device, the second pressing plate (14) drives the first pressing plate (12), the pressing rod (13) and the second pressing plate (14) to reset upward, the internal interlock between the second pressing plate (14) and the circuit breaker (31) is released, and the circuit breaker (31) can be closed.

2. The interlocking device of the load switch and the circuit breaker according to claim 1, characterized in that: The pressure rod (13) comprises a first pressure rod unit (131), a second pressure rod unit (132), and a third pressure rod unit (133); one end of the first pressure rod unit (131) is connected to the first pressure plate (12), and the other end is connected to one end of the second pressure rod unit (132); one end of the third pressure rod unit (133) is connected to the second pressure plate (14), and the other end is connected to the other end of the second pressure rod unit (132).

3. The interlocking device of the load switch and the circuit breaker according to claim 2, characterized in that: It also includes a first guide bracket (15), the first guide bracket (15) includes two guide plates parallel to each other, the two guide plates are connected to the load switch operating mechanism bracket (23), the two guide plates are provided with first through holes, and the first pressure rod units (131) pass through the first through holes in sequence.

4. The interlocking device of the load switch and the circuit breaker according to claim 3, characterized in that: It also includes a second guide bracket (16), the second guide bracket (16) includes two guide plates parallel to each other, the two guide plates of the second guide bracket (16) are both connected to the cabinet of the load switch, the two guide plates of the second guide bracket (16) are both provided with second through holes, and the second pressure rod units (132) pass through the second through holes in sequence.

5. The interlocking device of the load switch and the circuit breaker according to claim 4, characterized in that: The first pressure rod unit (131) and the second pressure rod unit (132), and the second pressure rod unit (132) and the third pressure rod unit (133) are all connected by bolts.

6. The interlocking device of the load switch and the circuit breaker according to claim 5, characterized in that: The first pressure rod unit (131) is a straight rod, and the second pressure rod unit (132) and the third pressure rod unit (133) are both L-shaped rods.

7. The interlocking device of the load switch and the circuit breaker according to claim 6, characterized in that: It also includes a limit plate (17), which is connected to the load switch operating mechanism bracket (23). The limit plate (17) is located below the second pressure rod unit (132). When the cam (11) presses the first pressure plate (12) downward to move the first pressure plate (12) down to a position, the second pressure rod unit (132) abuts against the limit plate (17).

8. The interlocking device of the load switch and the circuit breaker according to claim 7, characterized in that: The limiting plate (17) is an L-shaped plate, a limiting groove is formed between the limiting plate (17) and the load switch operating mechanism bracket (23), and the second pressure rod unit (132) is located in the limiting groove.

9. The interlocking device of the load switch and the circuit breaker according to claim 8, characterized in that: The circuit breaker (31) further comprises a rotating rod (313), the second pressure plate (14) being connected to one end of the rotating rod (313), a circuit breaker connecting rod (311) and a middle pressure plate (312) being arranged in the circuit breaker (31), the middle pressure plate (312) being connected to the middle of the rotating rod (313), the reset device being a reset spring (314), the reset spring (314) being arranged on the circuit breaker connecting rod (311), the top of the circuit breaker connecting rod (311) being connected to the middle pressure plate (312), and the bottom being used for connecting to the internal connecting plate of the circuit breaker, and the bottom of the circuit breaker connecting rod (311) being pressed against the internal connecting plate of the circuit breaker when the second pressure plate (14) moves downward into position.

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