JPH0449209B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a grounding device attached to a switch, for example, a disconnector as equipment for a power plant or substation, in which the disconnector and the grounding device are connected together. The present invention relates to an interlock device that correlates operations between the two.

(Prior art) Conventionally, this type of interlock device is
For example, there are those shown in FIGS. 31 to 35. In this device, both supporting metal fittings 63 and 64 on the main body base 61 for the disconnector and the drive base 62 for the grounding device are used.
A lock rod 65 is movably supported, and a disconnector-side lock plate 66 is rotatable in forward and reverse directions on a main body base 61 for a disconnector, and a lock shaft 67 is rotatable in forward and reverse directions on a drive base 62 for a grounding device. Lock portions 65a and 65b at both ends of the lock rod 65 correspond in between. A pair of brackets 6 protrude from both sides of the lock rod 65 on the support metal fitting 64 on the drive base 62 side.
A toggle plate 69 is rotatably supported on both brackets 68 by a support shaft 70. One end of both toggle plates 69 is connected to the lock rod 65 by a pin 71, and a tension spring 72 is connected between the other end and the bracket 68.

FIG. 33 shows a state in which the disconnector is closed. In this case, the locking portion 65a of the locking rod 65 is in contact with the locking plate 66 on the disconnector side, so the lockshaft 67 is rotated in an attempt to close the grounding. Even if an attempt is made to do so, the lock portion 65 of the lock rod 65 engaged in the lock groove 67a of the lock shaft 67
b will not come off and grounding operation will not be possible.

Next, when the disconnector is opened, the lock groove 66a of the lock plate 66 corresponds to the lock portion 65a of the lock rod 65, as shown in FIG. When the vehicle is grounded in this state, the lock shaft 67 rotates and the lock rod 65 is pushed, and the lock portion 65a of the lock rod 65 is engaged in the lock groove 66a of the lock plate 66 as shown in FIG. Therefore, as in the case of FIG. 33, the disconnector cannot close.

As the lock rod 65 moves, the toggle plate 69 tilts about the support shaft 70 via the pin 71, and as a result of this tilting, the tension spring 72 is positioned on either side of the support shaft 70 and rotates toward the lock rod 65. lock plate 66
Alternatively, it is pressed against the lock shaft 67 to prevent movement of the lock rod 65 due to vibration or the like.

(Problems to be Solved by the Invention) In such an interlock device, the structure is such that the lock rod 65 is interposed between the lock plate 66 that is interlocked with the disconnect switch and the lock shaft 67 that is interlocked with the grounding device. It has certain characteristics. Since this lock rod 65 is movable between the lock plate 66 and the lock shaft 67, the lock rod 65 can be moved between the lock plate 66 and the lock shaft 67.
5 is required to be pressed against either the lock plate 66 or the lock shaft 67. Therefore, not only the lock rod 65 but also a toggle mechanism as a holding means is required, which increases the number of parts and complicates the structure.

An object of the present invention is to reduce the number of parts and simplify the construction by directly engaging the lock part linked to the rotary rod that moves the grounding blade up and down in a specific grounding device with the lock part linked to the switch. It's about creating a structure.

Structure of the invention (means for solving the problem) The present invention has been made to achieve this object,
It has an upper contact electrically connected to the switch and a lower contact electrically connected to a grounding pedestal, and the pedestal rotatably supports a rotary rod having a male threaded portion by means of a rotary drive means. A grounding blade that is electrically connected to the lower contactor is supported so as to be able to move up and down, and the female threaded part of this grounding blade is screwed into the male threaded part of the rotating rod to move the grounding blade up and down as the rotating rod rotates forward and backward. In the grounding device, the grounding device is capable of moving toward and away from the upper contact by moving the upper contact, and the first lock is provided with a first lock that rotates forward and backward in conjunction with the on/off of the switch, and the rotating rod has a A second lock part that rotates forward and backward is provided corresponding to the first lock part, and a switch is connected to the first lock part so as to prevent the rotation of this rotating rod when the grounding blade is turned off. is provided with an engaging portion that engages on the rotation locus of the second lock portion,
The second lock part is provided with an engaging part that engages on the rotation trajectory of the first lock part so as to prevent the switch from closing when the switch is OFF and the grounding blade is ON. be.

(Function) In the present invention configured as described above, when the switch is in the on state and the grounding device is in the off state, the grounding blade is in the lowest position. On the other hand, the engaging part of the lock part on the switch side engages on the rotation locus of the engaging part of the lock part of the rotating rod, and the rotation of the rod is blocked, and the grounding blade cannot rise. , grounding becomes impossible.

When the switch is turned off from this state, the lock part rotates, the engaging part of the lock part separates from the engaging part of the lock part of the rotating rod, and the rod becomes rotatable and can be grounded. Become.

When the rotating rod rotates from this state, the grounding blade moves upward and contacts the upper contact, and is grounded from the switch through the upper contact, the grounding blade, the lower contact, and the frame. The rotating rod stops with the engaging part of the lock part being engaged on the rotation locus of the engaging part of the lock part on the switch side, and the rotation of the lock part on the switch side coincides with the locking part of the rotating rod. This prevents the switch from being turned on as it is blocked by the engaging part of the part.

When the rotating rod rotates in the reverse direction in this state where the switch cannot be closed, the grounding blade returns to the lowest position. The rotating rod stops when the engaging part of the lock part moves away from the rotation locus of the engaging part of the lock part on the switch side and the lock part on the switch side becomes rotatable, and in this state it cannot be opened or closed. You can put a container in it.

(First Embodiment) First, a first embodiment in which a grounding device according to the present invention is attached to a switch, particularly a disconnector, will be described with reference to FIGS. 1 to 14.

The disconnector 1 shown in FIGS. 1 to 3 will be outlined. Frame 2
consists of each leg 2a and a beam 2b thereon, and a base 2' of each phase is fixed on the beam 2b. An insulator tube 3 and both insulators 4 and 5 are erected on this base 2' for each phase. Disconnector fixed contacts 6 are attached to the insulators 3 and 5 on both sides of each phase. The central insulator 4 of each phase can be rotated horizontally with respect to the base 2', and a lever-shaped movable disconnector contact 7 is fixed thereon. It can be moved into and out of contact with the fixed contact 6.

Next, the sealed automatic grounding device 8 of this embodiment shown in FIGS. 4 to 6 will be described in detail. Insulator pipe 3 on one side of each phase
is also used as a component of the grounding device 8, and consists of an upper insulator tube 3a and a lower insulator tube 3b. Upper insulator tube 3a
An upper cover 9 is placed on top, and inside thereof is an upper contact 1 electrically connected to the fixed contact 6 for the disconnector.
0 is attached. The lower insulator tube 3b is the base 2'
It is fixed onto the top via a support case 11. A blade protection case 12 is fixed to a lower mounting portion 11a of this support case 11, and a cover 13 is further fixed to the lower end surface of this protection case 12. Inside the protective case 12, a cylindrical guide member 14 is fitted into the attachment portion 11a of the support case 11, and a lower contact 15 is attached to the lower end of its inner periphery. This lower contact 15 is electrically connected to the base 2'.

Between the mounting plate 16 sandwiched between the blade protection case 12 and the cover 13 and the mounting portion 11a of the support case 11, a first rotating rod 17 is mounted on one side of the protection case 12, and both bearings 18,
19, and a male threaded portion 17a is formed along substantially the entire length thereof. A cylindrical lower grounding blade 20 is fitted into the guide member 14 so as to be movable up and down, and a support member 21 is fixed to the lower end thereof. A female threaded portion 21a is protruded from one side of the support member 21, and is screwed into the male threaded portion 17a of the first rotating rod 17. The lower grounding blade 20 is connected to the guide member 14 and the first rotating rod 1.
7 and cannot rotate. Further, the lower grounding blade 20 is electrically connected to the lower contactor 15, and an intermediate contactor 22 is attached to the upper end of the inner circumference of the lower grounding blade 20. A threaded cylinder 23 is rotatably supported by a bearing 24 on a support member 21 at the center of the lower grounding blade 20, and a male threaded portion 23a is formed along substantially the entire length thereof. On the other hand, a drive shaft 2 having a rectangular cross section is installed in the center of the blade protection case 12 and is attached to the first rotating rod 17.
5 is rotatably supported on the mounting plate 16 by a bearing 26, and the threaded cylinder 23 is fitted into the drive shaft 25 so as to be vertically movable and rotatable therewith. When the first rotating rod 17 rotates forward and backward, the support member 21 of the lower grounding blade 20 moves up and down together with the threaded cylinder 23, and the drive shaft 2
When 5 rotates, the threaded cylinder 23 also rotates. In addition,
The threaded cylinder 23 and the drive shaft 25 constitute a second rotating rod 27.

A guide tube 28 having a square cross section is fixed on the support member 21 on the outer periphery of the threaded tube 23 within the lower grounding blade 20, and a cylindrical upper grounding blade 29 is fitted into the guide tube 28. .
A female threaded portion 30 is fixed to the lower end of the upper grounding blade 29, and this female threaded portion 30 is connected to the threaded tube 23.
It is screwed into the male threaded portion 23a of the guide tube 28, and is supported in a vertically movable but non-rotatable manner relative to the guide tube 28. A contact 31 is attached to the lower end of the outer circumference of the upper grounding blade 29 adjacent to the female threaded portion 30 . And the second rotating rod 27
When the screw tube 23 rotates, the upper grounding blade 2
9 moves up and down. In addition, the upper and lower insulating pipes 3a, 3
A guide ring 32 that guides the upper end of the lower grounding blade 20 is sandwiched between the blades b.

A rotation drive means 33 for the first and second rotation rods 17, 27 is installed within the cover 13. That is, the drive shaft 2 of the second rotating rod 27
An electric motor 34 is connected to the motor 5, and the drive shaft 25 and the first rotating rod 17 are interlocked by gears 35 and 36 (interlocking means) so that they can rotate simultaneously. Further, a manual handle attachment shaft 37 is attached to the outside of the cover 13, and the same shaft 37 and the drive shaft 25 are interlocked by gears 38, 39a, 39b, and 40.

A limit switch 41 for checking cutting operation and a limit switch 42 for checking turning operation are attached to both upper and lower ends of the blade protective case 12, and both limit switches 41 and 42 are connected to the lower grounding blade 20.
It is adapted to be turned on and off by the female threaded portion 21a of the support member 21.

As shown in FIG. 6, a lock shaft 43 is rotatably supported by the support case 11, and a circular lock plate 44 (first lock portion) is fixed to the inner end thereof. , a lock lever 45 is fixed to its outer end. This lock lever 45 is interlocked with the central insulator 4 via a link 46 and an interlocking lever 47. The lock plate 44 rotates forward and backward on a vertical plane as the disconnector 1 is opened and closed, and has an engagement recess 44b formed in its engagement outer periphery 44a. The upper end of the first rotary rod 17 protrudes above the mounting portion 11a of the support case 11, and the upper end has a locking portion consisting of an engaging stepped portion 49a and an adjacent engaging protrusion 49b. 48 is formed and corresponds to the lock plate 44.

Note that the insulator 3 and the blade protective case 12
has a sealed structure and is filled with gas.

Now, when the disconnector 1 is in the ON operating state and the grounding device 8 is in the OFF operating state, the lower grounding blade 20 and the threaded cylinder 23 of the second rotating rod 27 are protected, as shown in FIG. The upper grounding blade 29 is at the lowest movable position within the case 12, and the upper grounding blade 29 is at the lowest movable position within the lower grounding blade 20.
The limit switch 41 for checking the OFF operation is turned on, and the limit switch 42 for checking the ON operation is turned ON.
It turns OFF. On the other hand, as shown in Figures 7 and 8,
In the lock portion 48 of the first rotary rod 17, the engagement outer peripheral portion 44a of the lock plate 44 engages on the rotation locus of the engagement protrusion 49b, and the rotation of the rod 17 is prevented, and both grounding blades 20 , 29 cannot rise and cannot be grounded.

When the disconnector 1 is turned off from this state, the central insulator 4 rotates 90 degrees, and the rotation is transmitted to the lock plate 44 via the interlocking lever 47, link 46, lock lever 45, and lock shaft 43, and the lock plate 44 also rotates 90 degrees as shown in Figures 9 and 10. As a result, the engagement protrusion 49b of the first rotary rod 17 corresponds to the engagement recess 44b of the lock plate 44, and the rod 17 becomes rotatable and can be grounded.

When the electric motor 34 is driven from this state, the drive shaft 25 and threaded cylinder 23 of the second rotary rod 27 rotate, and at the same time, the first rotary rod 17 rotates via both gears 35 and 36. Therefore, the lower grounding blade 20 and the threaded cylinder 23 of the second rotary rod 27 move upward along the first rotating rod 17, and the upper grounding blade 29 simultaneously moves upward along the threaded cylinder 23. As shown in FIG. 5, when the limit switch 42 for confirming ON operation is turned on, the electric motor 34 stops, and both grounding blades 20,
29 and the threaded cylinder 23 stop at the uppermost moving position. In this grounding state, the upper grounding blade 29 contacts the upper contactor 10, the contactor 31 of the upper grounding blade 29 contacts the intermediate contactor 22, and one fixed contactor 6 of the disconnector 1 contacts the upper contactor 10. child 10, upper grounding blade 29, intermediate contactor 2
2. Grounded via the lower grounding blade 20, the lower contact 15, and the pedestal 2. First rotating rod 17
As shown in FIGS. 11 and 12, the engaging protrusion 49
b is engaged in the engagement recess 44b of the lock plate 44, and the rotation of the lock plate 44 is blocked by the engagement protrusion 49b, and the rotation of the central insulator 4 is also blocked, and the disconnector 1 cannot be turned on.

When the electric motor 34 rotates in the reverse direction in this state where the disconnector cannot be closed, both the grounding blades 20, 29 and the threaded cylinder 23 of the second rotating rod 27 move downward at the same time, and when the limit switch 41 for checking the disconnection operation is turned on, It stops and returns to the lowest position shown in FIG. As shown in FIGS. 13 and 14, the engagement outer peripheral portion 44a of the lock plate 44 is engaged with the engagement stepped portion 49a of the lock portion 48 of the first rotary rod 17, so that the lock plate 44 is rotatable. Stops in a state where If you turn on the disconnector 1 in this state where the disconnector can be turned on,
The locking plate 44 is rotated 90 degrees and returns to the state shown in FIGS. 7 and 8.

In particular, this embodiment has the following features.

(a) Since the lock portion 48 interlocked with the first rotary rod 17 that moves the lower grounding blade 20 of the earthing device 8 up and down is directly engaged with the lock plate 44 interlocked with the disconnector 1, it is possible to The illustrated lock rod and its holding means (toggle mechanism) are not required, and the number of parts can be reduced and the structure can be simplified.

(b) In this way, the lock portion 48 and the lock plate 44
7, 8, 11,
In the locked state shown in FIG. 12, the engagement structure is such that even if one part tries to rotate, no rotational force is applied to the other part.

(c) The lock part 4 is attached to the upper end of the first rotating rod 17.
Since the rod 8 is integrally formed, there is no need for a rotation transmission means from the rod 17 to the lock portion 48.
The number of parts can be reduced and the structure can be simplified.

(Second Embodiment) Next, a second embodiment in which the earthing device according to the present invention is attached to a switch, particularly a disconnector, will be described with reference to FIGS. 15 to 28. In this embodiment, explanations of structures corresponding to those of the first embodiment will be omitted, and common numbers will be given to them, and the explanation will focus on the different parts of the structure.

The disconnector 1 shown in FIGS. 15 to 17 will be outlined. On the base 2', an insulator tube 3 and an insulator 5 for each phase are erected so as to be rotatable in the horizontal direction, and are integrally rotatable by a link 50. A lever-shaped movable disconnector contactor 7 is fixed on top of them, and can be moved toward and away from each other as one of the insulators 5 is rotated.

Next, the sealed automatic grounding device 8 of this embodiment shown in FIGS. 18 to 20 will be described in detail. The other insulator tube 3 of each phase is also used as a part of the grounding device 8, and consists of an upper insulator tube 3a and a lower insulator tube 3b. An upper cover 9 is placed over the upper insulator tube 3a, and an upper contact 10 electrically connected to the movable disconnector contact 7 is attached to the inside thereof. A bearing housing 51 is mounted on the base 2'. A support case 11 is rotatably supported by the bearing housing 51, and the lower insulator tube 3b is fixed onto the support case 11. The blade protection case 12 is fixed to the lower surface of the bearing housing 51 via a mounting plate 52. This mounting plate 52 corresponds to the mounting portion 11a of the support case 11 in the first embodiment. Furthermore, 53 indicates the base 2' and the bearing housing 5.
This is an adjustment bolt provided between 1 and 1.

As shown in FIGS. 21 to 28, a quarter-arc shaped lock plate 44 (first lock portion) is fixed to the lower end surface of the support case 11, and the first rotary rod 1
This corresponds to the engagement stepped portion 49a and the engagement protrusion 49b of the lock portion 48 of No.7.

The rest of the structure is substantially the same as that of the first embodiment.

Now, when the disconnector 1 is in the ON operating state and the grounding device 8 is in the OFF operating state, the lower grounding blade 20 and the threaded cylinder 23 of the second rotating rod 27 are protected, as shown in FIG. The upper grounding blade 29 is at the lowest movable position within the case 12, and the upper grounding blade 29 is at the lowest movable position within the lower grounding blade 20. The limit switch 41 for checking the OFF operation is turned on, and the limit switch 4 for checking the ON operation is turned on.
2 is turned off. On the other hand, as shown in FIGS. 21 and 22, the engagement outer circumferential portion 44c of the lock plate 44 engages on the rotation locus of the engagement protrusion 49b in the lock portion 48 of the first rotary rod 17. Rod 1
7 is prevented from rotating, and both grounding blades 20, 29
will not be able to ascend and will not be able to land.

When the disconnector 1 is turned off from this state, one of the insulators 5 rotates 90 degrees, and the rotation is transmitted to the lock plate 44 via the link 50 and the support case 11 of the other insulator 3, and the lock plate 44 also rotates. Rotate 90 degrees as shown in Figures 23 and 24. As a result, the engagement end 44d of the lock plate 44 separates from the engagement step 49a of the lock portion 48 of the first rotary rod 17, and
becomes rotatable and can be grounded.

When the electric motor 34 is driven from this state, the drive shaft 25 and threaded cylinder 23 of the second rotary rod 27 rotate, and at the same time, the first rotary rod 17 rotates via both gears 35 and 36. Therefore, the lower grounding blade 20 and the threaded cylinder 23 of the second rotary rod 27 move upward along the first rotating rod 17, and the upper grounding blade 29 simultaneously moves upward along the threaded cylinder 23. As shown in Figure 19,
When the limit switch 42 for confirming ON operation is turned ON, the electric motor 34 stops and both grounding blades 20,
29 and the threaded cylinder 23 stop at the uppermost moving position. In this grounding state, the upper grounding blade 29 contacts the upper contactor 10, the contactor 31 of the upper grounding blade 29 contacts the intermediate contactor 22, and one fixed contactor 6 of the disconnector 1 contacts the upper contactor 10. child 10, upper grounding blade 29, intermediate contactor 2
2. Grounded via the lower grounding blade 20, the lower contact 15, and the pedestal 2. First rotating rod 17
As shown in FIGS. 25 and 26, the engaging protrusion 49
b is engaged on the rotation locus of the engagement end 44d of the lock plate 44, and the rotation of the lock plate 44 is blocked by the engagement protrusion 49b, thereby preventing the rotation of the insulator 3 and the insulator 5. This also prevents the disconnector 1 from turning on.

When the electric motor 34 rotates in the reverse direction in this state where the disconnector cannot be closed, both the grounding blades 20, 29 and the threaded cylinder 23 of the second rotating rod 27 move downward at the same time, and when the disconnection confirmation switch 41 is turned ON, It stops and returns to the lowest position shown in FIG. Second
As shown in Figures 7 and 28, the first rotating rod 17
The lock plate 44 stops when the engagement protrusion 49b of the lock portion 48 moves away from the rotation locus of the engagement end 44d of the lock plate 44 and the lock plate 44 becomes rotatable. If you turn on the disconnector 1 in this state where the disconnector can be turned on,
The locking plate 44 is rotated 90 degrees to the state shown in FIGS. 21 and 22.

This embodiment also has the same features as (a), (b), and (c) of the first embodiment.

(Modifications of the first and second embodiments) FIGS. 29 and 30 show modifications of the rotation drive means 33 in the first and second embodiments, in which the first rotation rod 17 is provided with an electric motor. 34 is connected via a clutch 54, and an electric motor 34 is connected to the drive shaft 25 of the second rotating rod 27 via both gears 55, 56 and a clutch 57. Further, the manual handle mounting shaft 37 on the outside of the cover 13 has gears 58, 59, and the gear 56.
The gears 58, 59, 5 are connected to the drive shaft 25 of the second rotary rod 27 via the clutch 57, and the gears 58, 59, 5 are connected to the first rotary rod 17.
6, 55 and a clutch 54.

Now, in the first and second embodiments, the lower grounding blade 20 and the upper grounding blade 29 move up and down simultaneously, but in this modified example, they move up and down sequentially. That is, in the state shown in FIGS. 4 and 18 (the rotational drive means 33 is as shown in FIGS. 29 and 30), only one clutch 54 is engaged, and the electric motor 34 is engaged.
When driven, only the first rotary rod 17 rotates, and the lower grounding blade 20 moves upward together with the upper grounding blade 29 inside thereof, resulting in the state shown in FIGS. 29 and 30. In this case, upper grounding blade 2
9 does not move upward relative to the lower grounding blade 20. Next, one clutch 54 is disengaged and the other clutch 57 is engaged, and the drive shaft 25 of the second rotating rod 27 is rotated.
When the screw tube 23 rotates and the first rotating rod 20 stops, the upper grounding blade 29
5 and 19 (the rotary drive means 33 is moved upward relative to the stopped lower ground blade 20).
The state shown in the figure is as shown in the figure.

Note that when the electric motor 34 rotates in the reverse direction, both the grounding blades 20 and 29 sequentially move downward by substantially opposite actions.

(Other Examples) Note that the grounding device of the present invention can also be embodied as follows.

(a) In each of the above embodiments, two stages of grounding blades 20,
29, but this should be three or more steps or only one step.

(b) In each of the above embodiments, the insulator tube 3 of the earthing device 8 was also used as the insulator of the disconnector 1, but for example,
They should be installed separately as shown in Publication No. 60-42005.

(c) In each of the above embodiments, a sealed type was used, but as shown in, for example, Japanese Utility Model Application No. 60-129807, the insulator tube and blade protection case may be eliminated to make it a non-sealed type.

(d) Applicable to switches other than disconnectors.

Effects of the Invention According to the present invention described in detail above, the lock part interlocked with the rotary rod that moves the grounding blade of the grounding device up and down and the lock part interlocked with the switch are directly engaged. The illustrated lock rod and its holding means (toggle mechanism) are not required, and the number of parts can be reduced and the structure can be simplified.

[Brief explanation of drawings]

1 to 14 show the first embodiment, FIG. 1 is a schematic front view showing a disconnector with a grounding device, FIG. 2 is a schematic side view, FIG. 3 is a schematic partial plan view, and FIG. is a cross-sectional view showing the grounding device in a non-grounded state, FIG. 5 is a cross-sectional view showing the grounding state of the grounding device,
FIG. 6 is a partially enlarged sectional view of FIG. 5, FIGS. 7 and 8 are operation explanatory diagrams showing the interlock device in a state where the disconnector is on and the ground is off, and FIGS. 9 and 10 The figure is an explanatory diagram showing the operation of the interlock device in the state shown in Figs. 7 and 8 with the disconnector also turned off, and Figs. 11 and 12 are in the state shown in Figs. 9 and 10 with the grounding turned on. 13 and 14 are operation explanatory diagrams showing the interlock device in the state shown in FIGS. 11 and 12 with the interlock device disconnected from the ground. FIGS. 15 is a diagram corresponding to the aforementioned FIG. 1, FIG. 16 is a diagram equivalent to the aforementioned FIG. 2, FIG. 17 is a diagram equivalent to the aforementioned FIG. 3,
FIG. 18 is a view corresponding to the above-mentioned FIG. 4, FIG. 19 is a view corresponding to the above-mentioned FIG. 5, FIG. 20 is a partially enlarged sectional view of FIG. 19, and FIGS.
Figures 23 and 24 are equivalent to Figures 9 and 10, Figures 25 and 26 are equivalent to Figures 11 and 12, and Figures 27 and 2 are equivalent to Figures 11 and 12.
Figure 8 is a diagram corresponding to Figures 13 and 14, and Figure 29.
Figures 30 to 30 show modified examples of the first and second embodiments,
FIG. 29 is a sectional view showing the state of the grounding device in the middle of transition from the non-grounded state to the grounded state in the first embodiment in which the rotation drive means is changed, and FIG. 30 is a similar state in the middle in the second embodiment in which the rotational drive means is also changed. 31 to 35 show a conventional interlock device, FIG. 31 is a plan view thereof, FIG. 32 is a front view thereof, and FIGS. 33 to 35 are diagrams illustrating its operation. 1... Disconnector (switch), 2... Frame, 3... Insulator pipe,
8... Earthing device, 10... Upper contact, 12... Blade protection case, 15... Lower contact, 17... First rotating rod, 17a... Male threaded part, 20... Lower grounding blade, 21a... Female threaded part, 22... Intermediate Contactor, 23...Threaded cylinder, 23a...Male thread part, 25...Drive shaft, 27...Second rotating rod, 29...Upper grounding blade, 30...Female thread part, 44...Lock plate (first lock part), 44a , 44c...Engagement outer peripheral part (engagement part), 48...Second lock part, 49b...Engagement protrusion (engagement part).

Claims (1)

[Claims] 1. Upper contact 10 electrically connected to switch 1
and a lower contact 15 that is electrically connected to the grounding frame 2. The frame 2 rotatably supports a rotary rod 17 having a male threaded portion 17a by means of a rotary drive means 33, and the lower contact 15 is electrically connected to the grounding frame 2. The grounding blades 20 and 29 electrically connected to the grounding blades 20 and 29 are supported vertically movably, and the female threaded portions 21a provided on the grounding blades 20 and 29 are screwed into the male threaded portion 17a of the rotating rod 17, so that the rotating rod 17 can be rotated in the forward and reverse directions. In a grounding device that can move toward and away from the upper contact 10 by moving the grounding blades 20 and 29 up and down as it rotates, the first lock portion rotates forward and backward in conjunction with the on/off of the switch 1. 44, and the rotary rod 17 is provided with a second lock portion 48 corresponding to the first lock portion 44, which rotates forward and backward as the rotary rod 17 rotates.
When the switch 1 is in the first lock part 44 and the grounding blades 20 and 29 are in the off state, the first lock part 44 has an engagement that engages on the rotation trajectory of the second lock part 48 to prevent the rotation of the rotary rod 17. Joint parts 44a and 44c are provided,
The second lock part 48 has an engagement that engages on the rotation trajectory of the first lock part 44 so as to prevent the switch 1 from closing when the switch 1 is off and the grounding blades 20 and 29 are on. A grounding device with an interlock device for a switch, characterized in that a joint portion 49b is provided.