JPH0241804Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to an operating device for a switch that can be switched to three positions.

[Prior art]

For example, in a 33KV system distribution board, when the disconnect switch is switched from the closed position (connected to the system) to the grounded position, depending on the charging capacity in the system,
There is a risk that discharge current will flow unnecessarily to the ground side through the disconnector. Therefore, in such a system,
When the disconnector is opened, the movable piece of the disconnector is automatically stopped at an intermediate position between the closed position and the grounded position.
It is necessary to wait for the charge in the grid to naturally discharge.

However, in conventional disconnectors, the movable contact piece is
As long as operating force was applied, the switch would not automatically stop at the intermediate position but would switch to the ground contact position, which was dangerous for operation.

[Purpose of invention]

This idea was made to solve the above-mentioned problem.
It is an object of the present invention to provide a switch operating device in which the switching operation is forcibly stopped once at an intermediate position between two switching positions.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings.

In Figures 1 and 2, 1 is a gas-insulated switchboard used in a 33KV system, which is formed by a combination of steel plates into a rectangular case, and has a disconnector chamber 3 that houses a disconnector 2 and a busbar. SF ₆ gas of about 1.3 atmospheres is filled in the breaker chamber 5 that houses the breaker 4.

The disconnector 2 has a movable contact piece 7 by rotating the main shaft 6.
rotates between the fixed contact 8 in the closed position and the fixed contact 9 in the grounded position.

The main shaft 6 of the movable piece 7 is attached to the front panel 1 of the disconnector chamber 3.
0 airtightly and rotatably through the operation chamber 1.
1 , and is connected to an operating device 20 that controls the rotational position of the movable contact piece 7 .

FIG. 3 shows details of the operating device 20, and the main shaft 6 of the disconnector 2 is a square shaft 2 with a regular hexagonal cross section.
1.

The square shaft 21 has a ring 6 that fits complementary to the square shaft 21.
An inner spool 22 with a cylindrical outer periphery and a corner hole.
is slidably fitted in the axial direction of the square shaft 21, and this spool 22 is connected to the inner spool 22 and the square shaft 2.
A coil spring 24, which is elastically fitted between a shoulder portion 23 formed in the front of the holder 1, is biased toward the right in FIG.

Furthermore, a shoulder portion 2 formed on the inner spool 22
5 engages with a housing-shaped fixing member 26, which prevents the inner spool 22 from moving from this position to the right in the figure.

The fixing member 26 is attached to the outer periphery of the inner spool 22.
in the space between the first outer spool 27 and the second outer spool 27.
The outer spool 28 is coaxially and rotatably fitted to the inner spool 22. As shown in FIG. 4, the first outer spool 27 has key grooves 27a, 27b, and 27c of appropriate widths at 60° intervals, and the second outer spool 28 has key grooves 28X.
Further, each of the outer spools 27 and 28 has engaging plates 29 and 30 formed to protrude in the diametrical direction.

A key 3 of an appropriate length is attached to the outer periphery of the inner spool 22.
1 is fitted, and the key 31 is attached to each outer spool 2.
It is slidable in the axial direction within the key grooves 27a to 27c and 28X of 7 and 28.

One end of a spring 33 is engaged with the engagement plate 29 of the first outer spool 27, and the other end of the spring 33 is engaged with a bolt 35 protruding from a fixing member 34. The first outer spool is biased so that the engagement plate 29 returns to the upright position as shown in FIG.

Opposing wall surfaces 26a and 26b of the fixing member 26
Locking shafts 40 and 41 (see FIG. 4) are bridged horizontally between them, and when the outer spool 27 rotates and the engagement plate 29 rotates 60 degrees from the upright position, the locking shafts 40 and 41 41 to restrict further rotation.

In FIG. 3, an operation handle 50 that can be freely fitted and removed from the square shaft 21 is fitted with a 6 that is complementary to the square shaft 21.
It has a square hole 51 and a suitable handle 52. This operation handle 50 has a hole 5 formed in the panel 11a.
3 and is fitted onto the square shaft 51.

Note that the fixing member 26 is fixed with bolts to a frame 38 fixed to the switchboard.

In the operating device having the above configuration, when the movable contact piece 7 of the disconnector 2 is located at the intermediate position M and no operating force is applied, the key 31 is at the position shown in FIG. The engagement plate 30 is fitted into the key groove 28X of the second outer spool 28 located at the top, and the engagement plate 30 is also located in an upright position.

On the other hand, the first outer spool 27 is connected to the spring 3
3, the engagement plate 29 is in an upright position.

Further, since the key 31 is locked in a key groove 60b formed in the fixed member 26, the square shaft 21 cannot be rotated by the operation handle 50, or in other words, the disconnector 2 cannot be switched.

Now insert the handle 50 into the hole 53 of the panel 11a.
through the hole 51 into the square shaft 21, and the third
When pushed to the left on the diagram, the inner spool 22 and key 3
1 slides to the left while resisting the repulsive force of the spring 24, and the key 31 fits into the keyway 27b of the first outer spool 27.

After the key 31 is removed from the keyway 60 to the left, when the operating handle 50 is rotated clockwise in FIG. rotate clockwise. When rotated approximately 60 degrees, the engagement plate 29 of the first outer spool 27 comes into contact with the locking shaft 41, and the handle 50, and therefore the square shaft 21, are prevented from further clockwise rotation. The second outer spool 28 is also rotated 60 degrees, and the lever 7
0 turns on a switch (not shown) for an indicator light or the like (not shown), and displays the state of the disconnector. By the rotation of this square shaft 21,
The movable piece 7 of the disconnector 2 is locked at the switching position 8.

When the leftward pressing force on the operating handle 50 is released, the restoring force of the spring 21 causes the inner spool 22 and the key 31 to move to the right, causing the key 3 to move to the right.
1 passes through the keyway 60c and comes off from the first outer spool 27. As a result, the first outer spool 27 is pulled by the spring 33, and the engagement plate 29 is pulled into the fourth outer spool 27.
Return to the upright position as shown. The second outer spool 28 does not move, so the groove 28X faces the groove 27C of the first outer spool 27.

Then, when the operating handle 50 is pushed again to the left in the figure, the key 31 enters the key groove 27C, and when the operating handle 50 is rotated counterclockwise, the square shaft 21, each spool 22, 27, 28, The main shaft 6 rotates 60 degrees counterclockwise, and the keyway 27C,
28X becomes an upright state, and the movable piece 7 of the disconnector 2 is switched to the intermediate position M.

As described above, once the operating handle 50 is removed from the switch, move the movable piece 7 to the intermediate position M between the fixed contacts.
The movable piece can be rotated by stopping it once and reinserting it. In this way, while the movable piece 7 is stopped at M, the electrical charges in the system are discharged.

In this case, the engagement plate 29 engages with the locking shaft 40 to prevent rotation of the square shaft 21 and the main shaft 6 by more than 60 degrees.

Similarly, when the operating force on the handle 60 in the leftward direction in the drawing is released, the inner spool 22 and the key 31 move to the right, and the key 31 moves to the second outer spool 2.
7, the second outer spool 27 is rotated clockwise by the force of the spring 33, and the keyway 27b is located in an upright state, and the keyways 27b, 2
8X faces each other. When the handle 50 is pushed to the left again and the key 31 is moved to the left, the key 31 is fitted into the key groove 27b, and as the handle 50 is further rotated counterclockwise, the first and second outer spools 2
7 and 28 rotate, the main shaft 6 is rotated counterclockwise, and the movable piece 7 is switched to the grounding position 9.

In this state, when the operating force on the handle 50 is released, the key 31 moves to the right through the keyway 60a.

When the handle 50 is operated to the left again, key 3 is pressed.
1 fits into the keyway 27a, making it possible to rotate the main shaft 6 clockwise.

In these operations, the second outer spool 28
rotates with rotation of the handle and is located at the same position as the main shaft 6, and by moving the lever 70, the indicator light switch is operated to indicate the position of the main shaft 6.

If the movable piece 7 of the disconnector is to be switched in the opposite direction, the operating handle may be rotated clockwise in the above-described operation.

Note that a key groove is formed in the hole 53 of the panel 11a at a position corresponding to the three switching positions, and a protrusion 54 is also provided on the operating handle 50, so that when the operating handle 50 is not at each switching position of 60 degrees, the key 54 is formed.
comes into contact with the panel 11a, and the operation handle 50
By making it impossible to remove the disconnector, switching operation of the disconnector can be ensured.

[Effect of idea]

As detailed above, according to this invention, a switch such as a disconnector always stops once at an intermediate position between two switching positions, releases the operating force once, and operates it again. It is possible to provide an unprecedented operating device that allows switching to continue, and it is possible to reliably prevent the failure of instant switching from a closed position connected to the grid to a grounded position, for example in a disconnector.

Note that the number of corners of the square shaft 21, the positions of the locking shafts 40, 41, etc. may be arbitrarily set according to the interval between the two switching positions of the switch.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing an example of a switchboard to which the operating device of this invention is applied, Fig. 2 is a diagram showing the relationship between the disconnect switch of the switchboard of Fig. 1 and the operating device, and Fig. 3 is a diagram showing the relationship between the operating device and the disconnect switch of the switchboard of Fig. 1. A sectional view showing an example of an operating device,
4 is a front view showing the main part of FIG. 3, FIG. 5 is a view showing an example of the operating handle, and FIG. 6 is a view showing an example of a keyway formed in the fixing member. 2...Disconnector, 6...Main shaft, 7...Movable piece, 8
... Closed position, 9 ... Ground position, 20 ... Operating device, 21 ... Square shaft, 22 ... Inner spool, 27
...First outer spool, 28... Second outer spool, 29, 30... Locking plate, 40... Locking shaft, 5
0...Operation handle.

Claims (1)

[Scope of utility model registration request] The rotating shaft 21 of the movable contact piece that rotates between two fixed contacts separated by a predetermined angle is formed into a square shaft, and the inner spool 22 is movable in the axial direction of the rotating shaft 21 on this square shaft, and in the circumferential direction. The outer spool 27 is movably fitted onto the inner spool 22, and the outer spool 27 is urged by a spring to return to a predetermined angular position. While the key 31 is made to protrude in the direction, the outer spool 27 is formed with a plurality of key grooves 27a, 27b, and 27c spaced apart at a predetermined angle in the circumferential direction of the outer spool, which are slidably fitted with the key 31. Furthermore, the key 31 of the inner spool is inserted into the key groove 27 on the outer spool 27 and the fixing member 26.
a, 27b, and 27c, the rotating shaft 21
When rotated, the inner spool, outer spool, rotating shaft, and movable contact piece rotate as one, and when rotated by a predetermined angle, they engage with each other and the inner spool,
A protrusion 29 and a fixed member 4 that prevent rotation of the outer spool, rotating shaft, and movable contact piece between two fixed contacts.
0, and furthermore, the key 31 is inserted into the key groove 27a,
The spring 3 returns the outer spool 27 by the predetermined angle when released from the springs 27b and 27c.
3 is provided between the outer spool and the fixing member.