Mechanical interlocking devices for switchgear

Abstract

To reliably prevent a disconnector and a grounding switch from being closed simultaneously without affecting the switch functions of a disconnector and grounding switch even when a mechanical interlock device is installed between the disconnector and the grounding switch.SOLUTION: A mechanical interlocking device for switchgear according to the present invention includes: a ratchet connected to a shaft of a motor that drives a grounding switch operating device that operates opening and closing of a grounding switch; a spring supported on a shaft that is connected to a drive rod that is driven in association with the opening and closing operation of a disconnector; a lever that is rotatably supported by the spring; and a pawl forming member that is rotatably supported at one end on the lever and has a pawl formed thereon to engage with the ratchet. Therein engagement and disengagement between the ratchet and the pawl are performed by the expansion and contraction of the spring in association with the opening and closing operation of the disconnector.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a mechanical interlock device for a switchgear, and in particular to a mechanical interlock device for a switchgear suitable for being installed between a disconnector and a grounding switch used in a gas-insulated switchgear, and configured so that when the disconnector is in a closed position, the grounding switch cannot operate, and when the grounding switch is in a closed position, the disconnector cannot operate. [Background technology]

[0002] Gas-insulated switchgear uses at least one metal-enclosed disconnector filled with gas to disconnect electrical equipment from high voltage lines to ensure safe operation and maintenance of the electrical equipment without load.

[0003] Also, from a safety point of view, in order to provide safer operation and maintenance, at least one earthing switch may be used together with the disconnector, so that capacitive or inductive currents are isolated.

[0004] Now, in order to avoid a phase to earth fault, the disconnector and the earthing switch are not allowed to be closed at the same time.

[0005] Typically, an electrical interlock device is installed between the disconnector and the earthing switch, and this electrical interlock device interlocks the disconnector and earthing switch operators by cutting off the current supply to the motors that drive the disconnector and earthing switch operators.

[0006] However, since an electrical interlock device will lose its function if there is a failure in an electrical component, in order to improve reliability, a mechanical interlock device is installed between the circuit breaker and the earthing switch.

[0007] For example, Patent Document 1 describes a switch interlock device in which an operator operates by rotating the switch operating shaft, and mechanically interlocks one switch so that when the other switch is closed or open, the other switch cannot be closed or opened, in order to reliably perform a mechanical interlock between switches separated by any distance. The operators of both switches are connected by a flexible tube containing a flexible wire, and a lock pin is driven in conjunction with the operation of one switch, preventing the shutter of the other switch from being opened, thereby mechanically interlocking both operators.

[0008] Furthermore, Patent Document 2 describes an interlock device for switches in which the opening and closing operations of a first switch, a second switch, and a third switch are transmitted to each other via an interlock wire to the other switches, in order to obtain an interlock device between multiple switches required in multiple power receiving and distribution circuits, etc., and when the second switch is closed, the actuator of the first switch moves to a first position, and when both the second and third switches are closed, the actuator of the first switch moves to a second position, and when the actuator of the first switch moves to the second position, an interlock device for switches is provided with a locking mechanism that restricts the closing operation of the first switch. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 60-167220 [Patent Document 2] Japanese Patent Application Publication No. 7-193923 Summary of the Invention [Problem to be solved by the invention]

[0010] Incidentally, in a mechanical interlock device, the operating part is designed to block the shaft or lever in the main operating part of the switching device, resulting in a very large blocking force, and the blocking part is designed to block the part that moves together with the movable contact of the switching device.

[0011] For this reason, if there is always a gap between the blocking parts, in the blocked state, when an attempt is made to close the switchgear by a motor or manual operation, the movement of the movable contact of the switchgear may become small and the dielectric distance may decrease, which may affect the dielectric performance of the switchgear.

[0012] In addition, when the disconnector and the earthing switch are installed at different positions far away from each other due to the layout of the gas-insulated switchgear substation, it is very difficult to connect to the mechanical interlock device installed between the disconnector and the earthing switch, and even if the connection can be made, the connection structure will be complicated, which may increase the cost and reduce the reliability.

[0013] However, the above-mentioned Patent Documents 1 and 2 do not disclose any solutions to solve such problems.

[0014] The present invention has been made in consideration of the above-mentioned points, and an object of the present invention is to provide a mechanical interlock device for switchgear that can reliably prevent the disconnector and earthing switch from being closed simultaneously without affecting the switch functions of the disconnector and earthing switch, even if a mechanical interlock device is installed between the disconnector and earthing switch. [Means for solving the problem]

[0015] In order to achieve the above-mentioned object, the mechanical interlock device of the switchgear of the present invention is a mechanical interlock device of the switchgear that is installed between a circuit breaker and a grounding switch and mechanically interlocks the opening and closing operations of the circuit breaker and the grounding switch, and is characterized in that the engagement and disengagement of the ratchet and pawl that constitute the mechanical interlock device is performed by a spring that expands and contracts in response to the opening and closing operation of the circuit breaker.

[0016] Specifically, the mechanical interlock device of the switchgear is installed between a circuit breaker and a grounding switch and mechanically interlocks the opening and closing operations of the circuit breaker and the grounding switch. The mechanical interlock device comprises a ratchet connected to the shaft of a motor that drives a grounding switch operating device that operates the opening and closing of the grounding switch, a spring supported on a shaft that is connected to a drive rod that drives in conjunction with the opening and closing operation of the circuit breaker, a lever rotatably supported by the spring, and a claw-forming member whose one end is rotatably supported by the lever and on which a claw that engages with the ratchet is formed. The engagement and disengagement of the ratchet and the claw is performed by the expansion and contraction of the spring in conjunction with the opening and closing operation of the circuit breaker. Effect of the Invention

[0017] According to the present invention, even if a mechanical interlock device is installed between the disconnector and the earthing switch, it is possible to reliably prevent the disconnector and the earthing switch from being closed simultaneously without affecting the switch functions of the disconnector and the earthing switch. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a front view showing a first embodiment of a mechanical interlock device for a switching device according to the present invention. [Diagram 2] FIG. 1 is a perspective view showing a first embodiment of a mechanical interlock device for a switching device according to the present invention. [Diagram 3] FIG. 2 is a roughly half front view showing a state in which a disconnector is open in the first embodiment of the mechanical interlock device for switchgear of the present invention. [Figure 4] 1 is a front view of a roughly half of the switchgear mechanical interlock device according to the first embodiment of the present invention, showing a state in which a disconnector is closed. FIG. [Diagram 5] FIG. 11 is a roughly half-sectional front view showing a second embodiment (an example in which a tension spring is used as the spring) of a mechanical interlock device for a switchgear according to the present invention. [Figure 6] FIG. 11 is a roughly half-sectional front view showing a third embodiment (an example in which a torsion spring is used as the spring) of a mechanical interlock device for switchgear according to the present invention. [Figure 7] FIG. 11 is a roughly half front view showing a fourth embodiment of a mechanical interlock device for a switchgear according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, a mechanical interlock device for a switchgear according to the present invention will be described based on the illustrated embodiments. In each drawing, the same reference numerals are used for the same components. EXAMPLES

[0020] 1 and 2 show a first embodiment of the mechanical interlock device for a switchgear of the present invention. Fig. 1 is a front view showing the first embodiment of the mechanical interlock device for a switchgear of the present invention, and Fig. 2 is a perspective view thereof.

[0021] In the mechanical interlock device 100A of the switchgear of this embodiment shown in Figures 1 and 2, the disconnector 12 (see Figures 3 and 4) is connected to the shaft 7 constituting the mechanical interlock device 100A via a drive rod 13 (see Figures 3 and 4) that is driven in response to the opening and closing operation of the disconnector 12, and the earthing switch (not shown) is connected to the motor shaft 2a of the motor 2 that drives the earthing switch operator that operates the opening and closing of the earthing switch.

[0022] The mechanical interlock device 100A is installed between the disconnector 12 and the earthing switch, and mechanically interlocks the opening and closing operations of the disconnector 12 and the earthing switch.

[0023] This embodiment is characterized in that the engagement and disengagement between the ratchet 1 that constitutes the mechanical interlock device 100A and the claw 3a formed on the claw forming member 3 is performed by a spring 5 that expands and contracts in response to the opening and closing operation of the circuit breaker 12.

[0024] The specific details will be explained below.

[0025] The mechanical interlock device 100A of this embodiment shown in Figures 1 and 2 is roughly configured to include a ratchet 1 connected to a motor shaft 2a of a motor 2 that drives a grounding switch operating device that operates the opening and closing of a grounding switch, a spring 5 supported on a shaft 7 that is connected to a drive rod 13 (see Figures 3 and 4) that is driven in conjunction with the opening and closing operation of a disconnector 12, a drive lever 4 that is rotatably supported by this spring 5 via a fixed shaft 10, and a claw forming member 3 whose one end is rotatably supported by this drive lever 4 and on which a claw 3a that engages with the ratchet 1 is formed, and the engagement and disengagement of the ratchet 1 with the claw 3a is performed by the expansion and contraction of the spring 5 in conjunction with the opening and closing operation of the disconnector 12.

[0026] In addition, the ratchet 1 described above is formed in a disk shape, and the motor shaft 2a of the motor 2 is connected through a hole formed in the center of the disk. The outer periphery of the ratchet 1 formed in a disk shape has a plurality of uneven portions inclined in a counterclockwise direction, and the ratchet 1 and pawl 3a are engaged with each other when the pawl 3a is inserted into the recess of the uneven portion, and the engagement between the ratchet 1 and pawl 3a is released when the pawl 3a is removed from the recess of the uneven portion.

[0027] In addition, the above-mentioned claw forming member 3 has one end rotatably supported on the drive lever 4 via a first pin shaft 9, and the other end is rotatably supported on a second pin shaft 8 fixed to the interlock device base 15.

[0028] In addition, the above-mentioned drive lever 4 is formed in an approximately L-shape having a horizontal flat portion 4b and a vertical flat portion 4a, and the bent portion of the approximately L-shaped drive lever 4 is rotatably supported by a fixed shaft 10 fixed to the interlock device base body 15. A first U-shaped groove 4a1 is formed in the vertical flat portion 4a of the drive lever 4, and a second U-shaped groove 4b1 is formed in the horizontal flat portion 4b of the drive lever 4.

[0029] The first pin shaft 9 is engaged with the first U-shaped groove 4a1 to rotatably support the claw forming member 3, and the shaft 7 connected to the drive rod 13 is operably supported (inserted) in the second U-shaped groove 4b1.

[0030] Furthermore, below the horizontal flat portion 4b of the drive lever 4, an L-shaped cross-section plate 11 is installed, which is fixed to the interlock device base 15 at a predetermined distance from the horizontal flat portion 4b of the drive lever 4. A through hole 11a through which the shaft 7 passes is formed at the end of this L-shaped cross-section plate 11, and a spring 5 is coaxially attached to the outer periphery of the shaft 7 passing through this through hole 11a. This spring 5 is held between the horizontal flat portion 4b of the drive lever 4 and the end of the L-shaped cross-section plate 11.

[0031] In addition, two nuts 6 that regulate the vertical movement of the drive lever 4 are installed on the end of the shaft 7 opposite to the end where the spring 5 is attached, sandwiching the horizontal flat portion 4b of the drive lever 4.

[0032] The spring 5 is preferably one of a pressure spring, a tension spring, a leaf spring, and a torsion spring. Reference numeral 7a in the figure denotes a cover that covers the shaft 7 and the driving rod 13.

[0033] Next, the engagement and disengagement between the ratchet 1 and the pawl 3a in the mechanical interlock device 100A of the opening and closing device of this embodiment having the above-mentioned configuration will be described with reference to FIGS.

[0034] FIG. 3 shows the disconnector 12 in the "open" position, with the ratchet 1 and the pawl 3a disengaged, and FIG. 4 shows the disconnector 12 in the "closed" position, with the ratchet 1 and the pawl 3a engaged.

[0035] As shown in Fig. 3, when the disconnector 12 is in the "open" operation, the drive rod 13 moves upward, and the shaft 7 moves downward accordingly. When the shaft 7 moves downward, the drive lever 4 is pulled downward by the shaft 7 and the nut 6, compressing the spring 5 and rotating the drive lever 4 clockwise around the fixed shaft 10, and accordingly the pawl forming member 3 engaged with the first pin shaft 9 rotates counterclockwise around the second pin shaft 8. Then, the pawl 3a formed on the pawl forming member 3 comes out of the recess of the uneven portion formed on the outer periphery of the disc-shaped ratchet 1, and the engagement between the ratchet 1 and the pawl 3a is released.

[0036] In this state, the ratchet 1 is not engaged with the pawl 3a, so the motor 2 can be rotated, but the drive lever 4 is held by the nut 6, so the pawl 3a cannot engage with the ratchet 1.

[0037] 4, when the disconnector 12 is in the "closed" operation, the drive rod 13 moves downward, and the shaft 7 rises upward accordingly. When the shaft 7 rises upward, the nut 6 moves away from the drive lever 4 and the spring 5, and the compression of the spring 5 is released, causing the drive lever 4 to rotate counterclockwise around the fixed shaft 10. As a result, when the pawl forming member 3 engaged with the first pin shaft 9 rotates clockwise around the second pin shaft 8, the pawl 3a formed on the pawl forming member 3 is inserted into a recess of a concave portion formed on the outer periphery of the disc-shaped ratchet 1, and the pawl 3a is engaged with the ratchet 1.

[0038] According to this embodiment, even if the mechanical interlock device 100A is installed between the disconnector 12 and the earthing switch, the engagement and disengagement between the ratchet 1 and the claw 3a is performed by the spring 5 which expands and contracts in response to the opening and closing operation of the disconnector 12, so that it is possible to reliably prevent the disconnector 12 and the earthing switch from closing simultaneously without affecting the switch functions of the disconnector 12 and the earthing switch.

[0039] In the above embodiment, the multiple concave-convex portions formed on the outer periphery of the disc-shaped ratchet 1 are inclined in the counterclockwise direction, but the multiple concave-convex portions formed on the outer periphery of the disc-shaped ratchet 1 may be inclined in the clockwise direction. In this case, it goes without saying that the pawl 3a formed on the pawl-forming member 3 is inclined so that it can be inserted into the concave portion of the concave-convex portion formed on the outer periphery of the ratchet 1.

[0040] Even with this configuration, the same effects as those described above can be obtained. EXAMPLES

[0041] Fig. 5 shows a second embodiment of the mechanical interlock device for a switchgear of the present invention. Fig. 5 is a roughly half front view showing the second embodiment of the mechanical interlock device for a switchgear of the present invention.

[0042] As shown in FIG. 5, the mechanical interlock device 100B of this embodiment includes a ratchet 1 connected to a motor shaft 2a of a motor 2 that drives a grounding switch operating device that operates the opening and closing of a grounding switch, a shaft 7 connected to a drive rod 13 that is driven in association with the opening and closing operation of a disconnector 12, and a horizontal plane portion 4b and a vertical plane portion 4a that are formed in a substantially L-shape, and the bent portion of the substantially L-shape is rotatably supported by a fixed shaft 10 of an interlock device base 15, and the vertical plane portion The interlock device is roughly configured to include a drive lever 4 having a first U-shaped groove 4a1 formed in 4a and a second U-shaped groove 4b1 formed in a horizontal plane portion 4b, a claw forming member 3 having one end rotatably supported on the drive lever 4 via a first pin shaft and the other end rotatably supported on a second pin shaft 8, and having a claw 3a formed thereon that engages with the ratchet 1, and a tension spring 14 having one end supported on a second fixed shaft 11b of the interlock device base 15 and the other end supported by the drive lever 4.

[0043] In this embodiment, the engagement and disengagement of the ratchet 1 and the pawl 3a is performed by a tension spring 14 which expands and contracts in accordance with the opening and closing operation of the disconnector 12.

[0044] Even with such a configuration of this embodiment, the effects are similar to those of the first embodiment. EXAMPLES

[0045] A third embodiment of the mechanical interlock device for a switchgear of the present invention is shown in Fig. 6. Fig. 6 is a roughly half front view showing the third embodiment of the mechanical interlock device for a switchgear of the present invention.

[0046] As shown in FIG. 6, the mechanical interlock device 100C of this embodiment includes a ratchet 1 connected to a motor shaft 2a of a motor 2 that drives a grounding switch operating device that operates the opening and closing of a grounding switch, a shaft 7 that is connected to a drive rod 13 that is driven in association with the opening and closing operation of a disconnector 12, a drive lever 4 that has a horizontal plane portion 4b and a vertical plane portion 4a and is formed in a substantially L-shape, the bent portion of the substantially L-shape being rotatably supported by a fixed shaft 10 of an interlock device base body 15, and in which a first U-shaped groove 4a1 is formed on the vertical plane portion 4a and a second U-shaped groove 4b1 is formed on the horizontal plane portion 4b, and one end of the drive lever 4 is connected to a first pin. The interlock device is roughly configured to include a claw forming member 3, the other end of which is rotatably supported via an axis 9 and the other end of which is rotatably supported via a second pin axis 8, and on which a claw 3a for engaging with the ratchet 1 is formed; a plate 11 with an L-shaped cross section which is installed below the horizontal plane portion 4b of the drive lever 4 and fixed to the interlock device base 15 at a predetermined distance from the horizontal plane portion 4b of the drive lever 4; and a substantially V-shaped torsion spring 17, one end of which is supported below the horizontal plane portion 4b and the other end of which is supported by the plate 11, and the center of which is supported by another fixed axis (an axis different from the first pin axis 9, the second pin axis 8, and the fixed axis 10) 18 of the interlock device base 15.

[0047] In this embodiment, the engagement and disengagement of the ratchet 1 and the pawl 3a is performed by a torsion spring 17 which expands and contracts in accordance with the opening and closing operation of the disconnector 12.

[0048] Even with such a configuration of this embodiment, the effects are similar to those of the first embodiment. EXAMPLES

[0049] Fig. 7 shows a fourth embodiment of the mechanical interlock device for a switchgear according to the present invention. Fig. 7 is a roughly half front view showing the fourth embodiment of the mechanical interlock device for a switchgear according to the present invention.

[0050] As shown in Figure 7, the mechanical interlock device 100D of this embodiment is roughly configured to include a ratchet 1A connected to a motor shaft 2a of a motor 2 that drives a grounding switch operating device that operates the opening and closing of the grounding switch, a spring 5 supported on a shaft 7 connected to a drive rod 13 that is driven in response to the opening and closing operation of a circuit breaker 12, and an approximately L-shaped drive lever 16 that is supported by the spring 5 so as to be rotatable about a fixed shaft 10a and has a claw 16a that engages with the ratchet 1A.

[0051] In this embodiment, the ratchet 1A and the pawl 16a are engaged and disengaged by the expansion and contraction of the spring 5 accompanying the opening and closing operation of the disconnector 12.

[0052] Specifically, in the mechanical interlock device 100D of this embodiment, the ratchet 1A is formed in a disk shape, and the motor shaft 2a of the motor 2 is connected through a hole formed in the center of the disk, and a plurality of uneven portions inclined in a clockwise direction are formed on the outer periphery of the disk-shaped ratchet 1A, and the ratchet 1A and the pawl 16a are engaged with each other by inserting the pawl 16a into the recess of the uneven portion, and the engagement between the ratchet 1A and the pawl 16a is released by removing the pawl 16a from the recess of the uneven portion.

[0053] The above-mentioned spring 5 is preferably any one of a pressure spring, a tension spring, a leaf spring, and a torsion spring.

[0054] According to this embodiment, even if a mechanical interlock device 100D is installed between the disconnector 12 and the earthing switch, the ratchet 1A engages and disengages from the claw 16a by the spring 5 which expands and contracts in response to the opening and closing operation of the disconnector 12, so that the disconnector 12 and the earthing switch can be reliably prevented from being closed simultaneously without affecting the switch functions of the disconnector 12 and the earthing switch.

[0055] Furthermore, since the claw 16a is formed integrally with the drive lever 16, the claw forming member 3 as in the first embodiment is eliminated, which also leads to a reduction in the number of parts.

[0056] The present invention is not limited to the above-mentioned embodiment, but includes various modifications. For example, the above-mentioned embodiment has been described in detail to easily explain the present invention, and is not necessarily limited to those including all of the configurations described. It is also possible to add a part of the configuration of one embodiment to the configuration of another embodiment. It is also possible to add, delete, or replace a part of the configuration of each embodiment with another configuration. [Explanation of symbols]

[0057] 1, 1A...ratchet, 2...motor, 2a...motor shaft, 3...claw forming member, 3a, 16a...claw, 4, 16...drive lever, 4a...vertical flat portion of drive lever, 4a1...first U-shaped groove, 4b...horizontal flat portion of drive lever, 4b1...second U-shaped groove, 5...spring, 6...nut, 7...shaft, 7a...cover, 8...second pin shaft, 9...first pin shaft, 10, 10a...fixed shaft, 11...plate, 11a...through hole, 11b...second fixed shaft, 12...disconnector, 13...drive rod, 14...tension spring, 15...interlock device base, 17...torsion spring, 18...other fixed shaft, 100A, 100B, 100C, 100D...mechanical interlock device.

Claims

1. A mechanical interlock device for a switchgear, which is installed between a disconnector and a grounding switch and mechanically interlocks the opening and closing operations of the disconnector and the grounding switch, A mechanical interlock device for a switchgear, characterized in that the engagement and disengagement of the ratchet and pawl that constitute the mechanical interlock device is performed by a spring that expands and contracts in accordance with the opening and closing operation of the disconnector.

2. A mechanical interlock device for a switchgear, which is installed between a disconnector and a grounding switch and mechanically interlocks the opening and closing operations of the disconnector and the grounding switch, The mechanical interlock device includes a ratchet connected to a shaft of a motor that drives a grounding switch operating device that operates the opening and closing of the grounding switch, a spring supported by a shaft that is connected to a drive rod that is driven in association with the opening and closing operation of the disconnector, a lever that is rotatably supported by the spring, and a claw-forming member that is rotatably supported at one end by the lever and has a claw formed thereon to engage with the ratchet, 13. A mechanical interlock device for a switchgear, comprising: a switchgear for connecting a switch to a disconnector; a switch for connecting a switch to a disconnector; a switch for connecting a switch to a disconnector;

3. The mechanical interlock device for a switching device according to claim 2, The ratchet is formed in a disk shape, the motor shaft is connected through a hole formed in the center of the disk, and a plurality of uneven portions inclined in a counterclockwise direction are formed on the outer periphery of the disk-shaped ratchet, and the ratchet and the pawl are engaged by inserting the pawl into the concave portion of the uneven portion, and the engagement between the ratchet and the pawl is released by removing the pawl from the concave portion of the uneven portion.

4. The mechanical interlock device for a switching device according to claim 3, a first pin shaft that is fixed to an interlock device base and a second pin shaft that is fixed to the interlock device base, the second pin shaft being fixed to the interlock device base and the first pin shaft being fixed to the interlock device base and the second pin shaft being fixed to the interlock device base.

5. The mechanical interlock device for a switching device according to claim 4, a first U-shaped groove formed in the vertical plane portion of the lever and a second U-shaped groove formed in the horizontal plane portion of the lever, the first pin shaft being engaged with the first U-shaped groove to rotatably support the claw forming member, and the shaft connected to a circuit breaker operating device being operably supported in the second U-shaped groove.

6. The mechanical interlock device for a switching device according to claim 5, a plate with an L-shaped cross section fixed to the interlock device base at a predetermined distance from the horizontal plane portion of the lever is installed below the horizontal plane portion of the lever, a through hole through which the shaft passes is formed at an end of the L-shaped cross section plate, the spring is coaxially attached to the outer periphery of the shaft passing through the through hole, and the spring is held between the horizontal plane portion of the lever and the end of the L-shaped cross section plate.

7. The mechanical interlock device for a switching device according to claim 6, A mechanical interlock device for an opening and closing device, characterized in that a nut that restricts movement of the lever is provided at the end of the shaft opposite to the end to which the spring is attached, across the horizontal flat portion of the lever.

8. The mechanical interlock device for a switching device according to claim 2, The ratchet is formed in a disk shape, the motor shaft is connected through a hole formed in the center of the disk, and a plurality of uneven portions inclined in a clockwise direction are formed on the outer periphery of the disk-shaped ratchet, and the ratchet and the pawl are engaged by inserting the pawl into the concave portion of the uneven portion, and the engagement between the ratchet and the pawl is released by removing the pawl from the concave portion of the uneven portion.

9. A mechanical interlock device for a switchgear, which is installed between a disconnector and a grounding switch and mechanically interlocks the opening and closing operations of the disconnector and the grounding switch, The mechanical interlock device includes a ratchet connected to a shaft of a motor that drives a grounding switch operating device that operates the opening and closing of the grounding switch, a spring supported by a shaft that is connected to a drive rod that is driven in association with the opening and closing operation of the disconnector, and a lever that is supported by the spring so as to be rotatable about a fixed shaft and has a pawl formed thereon to engage with the ratchet, 13. A mechanical interlock device for a switchgear, comprising: a switchgear for connecting a switch to a disconnector; a switch for connecting a switch to a disconnector; a switch for connecting a switch to a disconnector;

10. The mechanical interlock device for an opening and closing device according to claim 9, The ratchet is formed in a disk shape, the motor shaft is connected through a hole formed in the center of the disk, and a plurality of uneven portions inclined in a clockwise direction are formed on the outer periphery of the disk-shaped ratchet, and the ratchet and the pawl are engaged by inserting the pawl into the concave portion of the uneven portion, and the engagement between the ratchet and the pawl is released by removing the pawl from the concave portion of the uneven portion.

11. A mechanical interlock device for a switchgear according to any one of claims 1 to 10, 13. A mechanical interlock device for a switching device, wherein the spring is one of a pressure spring, a tension spring, a leaf spring, and a torsion spring.

12. A mechanical interlock device for a switchgear, which is installed between a disconnector and a grounding switch and mechanically interlocks the opening and closing operations of the disconnector and the grounding switch, the mechanical interlock device comprises: a ratchet connected to the shaft of a motor that drives a grounding switch operating device that operates the opening and closing of the grounding switch; a shaft connected to a drive rod that is driven in association with the opening and closing of the disconnector; a lever having a horizontal plane portion and a vertical plane portion and formed in a substantially L-shape, the substantially L-shaped bent portion of which is rotatably supported on a fixed shaft of an interlock device base, and a first U-shaped groove being formed on the vertical plane portion and a second U-shaped groove being formed on the horizontal plane portion; a claw forming member having one end rotatably supported on the lever via a first pin shaft and the other end rotatably supported on a second pin shaft, the claw forming member having a claw that engages with the ratchet; and a tension spring having one end supported on a second fixed shaft of the interlock device base and the other end supported by the lever, 13. A mechanical interlock device for a switching device, comprising: a tension spring which expands and contracts in association with an opening and closing operation of the disconnector, and which causes engagement and disengagement of the ratchet and the pawl by means of the tension spring.

13. A mechanical interlock device for a switchgear, which is installed between a disconnector and a grounding switch and mechanically interlocks the opening and closing operations of the disconnector and the grounding switch, The mechanical interlock device includes a ratchet connected to the shaft of a motor that drives a grounding switch operating device that operates the opening and closing of the grounding switch, a shaft connected to a drive rod that is driven in association with the opening and closing operation of the disconnector, a lever that has a horizontal plane portion and a vertical plane portion and is formed in a substantially L-shape, the bending portion of the substantially L-shape being rotatably supported on a fixed shaft of an interlock device base, and a first U-shaped groove is formed on the vertical plane portion and a second U-shaped groove is formed on the horizontal plane portion, a pawl forming member having one end rotatably supported via a first pin shaft and the other end rotatably supported via a second pin shaft, and having a pawl formed thereon to engage with the ratchet; a plate having an L-shaped cross section, which is placed below the horizontal plane portion of the lever and fixed to the interlock device base at a predetermined distance from the horizontal plane portion of the lever; and a torsion spring having one end supported below the horizontal plane portion and the other end supported by the plate, and a center portion supported by another fixed shaft of the interlock device base, 13. A mechanical interlock device for a switchgear, comprising: a torsion spring which expands and contracts in association with an opening and closing operation of the disconnector, and which causes engagement and disengagement of the ratchet and the pawl by means of the torsion spring.

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