KR101648319B1 - Switch gear - Google Patents

Abstract

The opening and closing device and its operating shaft 10 are received in the case 1 and the operating handle 11 is inserted into the insertion opening 12 from the outside to rotate the operating shaft 10 to turn the opening and closing device on or off A first cam 17 fixed to the camshaft 16 which rotates in conjunction with the rotation of the operation shaft 10 and a second cam 17 fixed to the camshaft 16. The shutter 13 includes a shutter 13, A second cam 18 that rotates in conjunction with the opening and closing operation, and a second cam 18 that is engaged with a recess provided in both cams 17 and 18 when the opening and closing device is "off" and the shutter 13 is " A first lock 14 capable of being locked and a second lock 15 capable of locking when the opening and closing device is "on" and the shutter is "closed" Key interlock mechanism.

Description

Switchgear {SWITCH GEAR}

The present invention relates to a key interlock which accommodates an opening / closing device such as a disconnecting switch or a grounding switch in a case and which is locked in a state of "on" or "off" to an interlock mechanism.

In maintenance and inspection of the high-voltage circuit of the switchgear, the switch of the upper (upper) system and the lower (lower) system connected from the switchgear is set to the "off" state and the circuit of the maintenance object is grounded There is a need. When the circuit is not grounded, there is a possibility that residual charge remains in the circuit. Therefore, there is a possibility that a contact with the live part or a short circuit may occur. Therefore, it is possible to lock the grounding switch in the grounded state mechanically by making a structure in which the grounding switch is in the "grounded" state and the key is removed, and by using this missing key, It is necessary to provide a structure for preventing the contact of the live parts and the occurrence of short-circuiting accidents when the circuit of the switchgear is inspected by opening the door of the switchgear to which the circuit is grounded.

In the case where a circuit is grounded and there is a possibility that a ground fault may be caused by applying a voltage to the circuit by operating a switch of a grounded circuit, Thereby preventing the occurrence of a ground fault by preventing the occurrence of a ground fault by allowing the switch to be mechanically locked in a disconnected state and operating the associated switch using the missing key so that a voltage can be applied to the circuit .

In order to solve the above problem, as a key interlock device of a conventional switchgear, for example, an interlock latch lock (corrective mechanism) is provided in each of a circuit breaker and a disconnecting device connected to the same circuit of an electric distribution board (switchboard) The breaker interlock of the breaker is provided with a recess corresponding to the position of closing and opening of the breaker on the outer periphery of a cam plate fixed to the breaker operation shaft and is provided with a latch lock rod rod is disposed so as to be engageable with the recess of the cam plate. By turning the disconnector operation shaft with the manipulation handle and correcting the position at the open or closed position, the rod is engaged with the recess and the state is locked (see, for example, Patent Document 1).

The operating handle is provided with an operating shaft which is provided at an end thereof with a prismatic portion which can be detached from and removed from the operating handle and which operates to open and close the disconnecting switch. Two lock pins which can be engaged with the pin holes provided at two positions in the circumferential direction of the operating piece and two locks which press the load pin by correcting the lock, A key interlock is disclosed in which the operating pin is fixed at a position covering the prismatic portion and the manipulating handle can not be inserted when the lock pin is operated by engaging the rod pin with the pin hole of the manipulating piece by manipulating the respective locks 2).

Patent Document 1: Japanese Utility Model Application Laid-Open No. 61-84609 (page 4-6, 7-8) Patent Document 2: JP-A-02-193506 (page 5, Fig. 3-4)

In the interlock mechanism of the disconnecting device as in Patent Document 1, since the operation of the disconnecting device is locked by engaging the latch with the recess of the cam plate moving in conjunction with the operation of the disconnecting device, it is possible to prevent an excessive force There is a risk that the cam plate and the latch portion may be damaged.

In the key interlock disclosed in Patent Document 2, the rod pin serving as the latch of the key interlock is engaged with the pin hole of the operation member provided on the operation shaft of the disconnecting unit to lock the operation of the disconnecting unit, and at the same time, However, there is a problem in that the number of parts such as the load pin and the operating knob increases, and it is also necessary to secure a large installation space for the parts.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems as described above, and it is an object of the present invention to provide an interlock mechanism which is capable of reducing the number of parts, And to provide a switchgear.

In the switchgear according to the present invention, an opening / closing device and its operation shaft are housed in a case, and an operation handle is inserted from the outside of the case to rotate the operation shaft to turn on / off the opening / closing device A first cam that rotates in conjunction with a rotation of the operation shaft; a second cam that rotates in conjunction with an opening and closing operation of the shutter; and a second cam which rotates in conjunction with opening and closing operations of the shutter, A key interlock having a lock capable of engaging the latch with the recess provided on the outer periphery of the first cam and the second cam when the shutter is " on " or " .

In addition, a three-point (point) isolator for performing "connection", "disconnect" and "grounding" of the electric circuit by one switch is housed in the case and its operation shaft is received from the outside of the case, A switchgear comprising: a shutter for opening and closing an insertion port of an operation handle formed in a case; a first cam rotating in conjunction with a rotation of the operation shaft; When the shutter is in the " closed " state and the outer circumference of the first cam and the second cam is in the " closed " state when the three- And a key interlock mechanism having three locks that can be locked by engaging the latch with the recess provided in the key interlock mechanism.

According to the switchgear of the present invention, there is provided a switchgear comprising a shutter for opening and closing an insertion port of an operation handle, a first cam rotating in conjunction with a rotation of the operation shaft, a second cam rotating in conjunction with opening and closing operations of the shutter, Since the key interlock mechanism has a lock that allows the latch to engage with the recess formed in the outer periphery of the first cam and the second cam when the shutter is "closed" or "off" and the shutter is "closed" The number of components constituting the key interlock mechanism can be reduced and the cost can be reduced as compared with the prior art.

In addition, as the number of parts is reduced, the space constituting the key interlock can be reduced, and space saving of the device can be achieved.

In addition, since the rotation of the operating shaft of the opening and closing device can be locked and the insertion of the operating handle can be locked at the same time, it is possible to prevent the operation handle from being mistakenly manipulated during the locking of the operating shaft to deteriorate the function of the interlock.

The first cam for rotating in conjunction with the rotation of the operating shaft, the second cam for rotating in conjunction with the opening and closing operation of the shutter, and the second cam for rotating the operating handle in such a manner that the three- Ground ", and when the shutter is" closed ", a key interlock mechanism having three locks that can be locked by engaging the latches with the concave portions provided on the outer periphery of the first cam and the second cam The same effect as described above can be obtained in a switchgear having a three-point disconnecting switch.

1 is a front view and a side sectional view of a switchgear according to Embodiment 1 of the present invention.
Fig. 2 is a front view and a bottom view showing the interlock mechanism of Fig. 1;
3 is a perspective view of the interlock mechanism portion of FIG.
Fig. 4 is a detailed view of the first cam and the second cam of the interlock mechanism portion of Fig. 2;
5 is a perspective view showing the main part of Fig.
6 is an explanatory view showing the relationship between the operating position of the shutter and the earthing switch of Fig. 2 and the rotating position of the cam.
Fig. 7 is an explanatory view showing the relationship between the turning position of each cam and the correction in Fig. 2;
8 is an explanatory view of an operating position of the shutter and earthing switch of the interlock mechanism portion and a rotating position of the cam, which shows another embodiment of the switchgear according to Embodiment 1 of the present invention.
Fig. 9 is an explanatory view showing the relationship between the turning position of the cam and the correction in Fig. 8;
10 is an explanatory view showing the relationship between the opening / closing position of the shutter of the interlock mechanism portion of the switchgear and the rotation position of the second cam according to the second embodiment of the present invention.
11 is an explanatory view showing the relationship between the open / close position of the three-point disconnector of the interlock mechanism according to the second embodiment and the rotation position of the first cam.

Embodiment 1

Fig. 1 shows the entire configuration of a switchgear according to the first embodiment. Fig. 1 (a) is a front view, and Fig. 1 (b) is a side sectional view. Fig. 2 is an enlarged view of the interlock mechanism shown in Fig. 1, wherein (a) is a front view, and Fig. 2 (b) is a bottom view thereof.

First, the entire configuration of the switchgear according to the first embodiment will be described with reference to Fig.

The interior of the metal case 1 is partitioned into a plurality of compartments. A breaker (2) of a draw-out type is received in the breaker chamber on the front side so as to be pulled out from the front side. A cut-off portion (main portion, 3a and 3b are fixed and detachable from connection terminals protruding from the back surface of the circuit breaker 2. [

The upper portion of the rear side of the cutoff chamber is a bus chamber and the bus bars 4 of three phases are supported and arranged by insulators (not shown) (Branched) conductor 5 of the main circuit terminal of the disconnecting portion 3a to which the one end side of the connecting portion 2 is connected.

The lower portion of the bus barrel on the rear side of the breaker chamber is a cable chamber in which the cable 6 on the load side is housed and the cable 6 is connected to the main circuit terminal of the breaker portion 3b to which the other end side of the breaker 2 is connected, And a connecting conductor 7, and a current transformer 8 penetrates through the connecting conductor 7. Further, on the side of the disconnecting section 3b, the grounding switch 9 is connected via the connecting conductor 7. An operation shaft 10 for opening and closing the earthing switch 9 is horizontally arranged from the earthing switch 9 toward the front side of the case 1, (Fitting portion) in which the handle 11 is detachable is formed.

As shown in Figure 1 (a), a handle insertion port 12 is provided at the position of the operation shaft 10 on the front side of the case 1, into which the operation handle 11 can be inserted, A shutter 13 (more specifically, Figs. 2, 3, 5) capable of opening and closing the handle insertion port 12 is provided between the handle 12 and the end of the operating shaft 10. The operation handle 11 is inserted into the handle insertion port 12 and fitted to the end of the operation shaft 10 while the shutter 13 is open, The blade of the earthing switch 9 swings, and the earthing position " on " and the disconnecting position " off " can be switched by operating the operating shaft 10 with the operating shaft 10a (see Fig.

A first lock 14 and a second lock 15 are provided on the front side of the case 1 to lock the movement of the shutter 13 and the rotation of the operation shaft 10 in cooperation with a cam described later, These portions constitute a key interlock mechanism.

The internal structure of the switchgear is merely an example, and is not limited to Fig.

The present invention is characterized by a key interlock mechanism. Next, the key interlock mechanism will be described with reference to Figs. 2 to 5. Fig.

2 (a) is an enlarged view of a frame portion of the case 1 provided with the first and second locks 14 and 15 in Fig. 1 (a), and Fig. 2 (b) Bottom view.

Fig. 3 is a perspective view of the key interlock mechanism from the upper right side of the front view. Fig. 3 (a) shows a state in which the shutter 13 is opened, and Fig. 3 (b) shows a state in which the shutter 13 is closed. However, the city of each lock is omitted.

2 and 3, the camshaft 16, which is connected and rotated by the link lever 21 in conjunction with the rotation of the operation shaft 10, is supported in the case 1 in the case 1, Respectively. A first cam 17 fixed to the camshaft 16 and rotating together with the camshaft 16 is provided in the vicinity of the shaft end on the front side of the camshaft 16, A second cam 18 rotatable in interlock with the first cam 17 is rotatably provided on the camshaft 16 in the vicinity of the first cam 17. [ One end side of the shutter 13 is engaged with an engaging pin 19 provided on the second cam 18.

A knob 20 protruding outward from the slit 1a provided in the case 1 is provided on the other end side of the shutter 13. When the knob 20 is slid in a lateral direction as viewed from the front side The shutter 13 is opened to open the handle insertion port 12 in the front face of the case 1 and the shutter 13 is opened at the right end as shown in FIG. The handle insertion opening 12 is closed.

The shape of the cam will be described with reference to Fig. 4 (a) is a first cam 17 fixed to the camshaft 16 and rotating together with the camshaft 16, and Fig. 4 (b) is a side view thereof. The first cam 17 is formed in a disk shape and has concave portions 17a and 17b which are notched toward the central axis at two positions located 90 degrees apart from the outer circumference. In the drawing, the concave portions 17a and 17b are shown to be continuous, but depending on the size of the concave portion, concave portions notched in a U-shape like (c) may be separately provided.

4 (c) is a front view of the second cam 18 that rotates in conjunction with the opening and closing operation of the shutter 13, and Fig. 4 (d) is a side view thereof. The second cam 18 has a disk shape and is provided with recessed portions 18a and 18b which are notched toward the central axis at two positions spaced 180 degrees from the outer periphery thereof. An engaging pin 19 engaging with one end of the shutter 13 is provided on the front side near the outer periphery.

Fig. 5 is a perspective view showing a main portion of the key interlock mechanism portion, and is a view seen from the front side. Fig. The first lock 14 and the second lock 15 are disposed on both sides of the first cam 17 and the second cam 18 in the radial direction and fixed to the case 1 side. The lock 14a of the first lock 14 and the latch 15a of the second lock 15 (see Fig. 6) are connected to both the cams 17 And 18, respectively. When the concave portions of the first cam 17 and the second cam 18 rotate together to the position of one of the latches, the lock of the lock at that position can be projected by a key operation. That is, even if only the concave portion of one cam is at the latch position, the key operation is impossible.

The engaging pin 19 of the second cam 18 is engaged with the engaging hole 13a provided at one end of the shutter 13. The second cam 18 is engaged with the shutter 13 in the left- And is rotatable with the camshaft 16 as an axis. That is, although the second cam 18 is coaxial with the first cam 17, it can be operated individually.

Next, the operation of the interlocking mechanism will be described with reference to Figs. 6 and 7. Fig.

Fig. 6 is a diagram showing the rotational position of each cam and the corrective relationship of each lock. Fig. 6A and 6B are diagrams showing the relationship between the opening and closing positions of the shutter 13 and the turning position of the second cam 18. Fig. and b) shows the case where the shutter 13 is closed. When the shutter 13 is opened, no locks 14 and 15 can be corrected. When the shutter 13 is closed, the locks 14 and 15 can be corrected. 6 (a) and 6 (b) illustrate only the relationship between the position of the shutter 13 and the locks 14 and 15, and in the actual operation, in relation to the first cam 17 , Both locks (14, 15) can not be corrected at the same time.

6C are diagrams showing the relationship between the opening and closing positions of the earthing switch 9 and the turning position of the first cam 17. Fig. (D) shows when the earthing switch 9 is " on ". The first lock 14 can be corrected when the earthing switch 9 is turned off and the second lock 15 can be corrected when the earthing switch 9 is turned on.

Also, the lock described here uses a lock in which the key is removed from the locked state and the key is unlocked in the unlocked state, and the key is locked by one for the lock 14 and one for the lock 15 In total. However, if it is not necessary to interlock and simply lock the grounding switch 9 in each of the "on" and "off" states, the same kind of key May be used, or the key may be removed from the state of correction or revision.

7 is a view for explaining the corrective relationship between the rotation positions of the first cam 17 and the second cam 18 and the locks 14 and 15 and shows a state viewed from the front side. The outer diameters of the first cam 17 and the second cam 18 are substantially the same, but the first cam 17 is slightly smaller and is indicated by a broken line so as to be easy to understand. The concave portion 17a of the first cam 17 and the concave portion 18a of the second cam 18 are engaged with each other so that the concave portion 17a of the first cam 17 and the concave portion 18a of the second cam 18, Position, the first lock 14 can be corrected. 7 (b), the concave portion 17b of the first cam 17 and the concave portion 18b of the second cam 18 jointly engage with the latch 15a of the second lock 15, The second lock 15 can be corrected.

6, only the first lock 14 can be corrected when the earthing switch 9 is "off" and the shutter 13 is "closed", and when the earthing switch 9 is turned "on" And when the shutter 13 is "closed", only the second lock 15 can be corrected. In any case, when the shutter 13 is opened, no lock 14 or 15 can be corrected, and when any one of the locks 14 and 15 is corrected, the shutter 13 can not be opened , The grounding switch 9 can not be operated.

In the normal operation state of the switchgear, the earthing switch 9 is in a disconnected state, that is, " off ", and the key interlock mechanism is in the state shown in Fig. 7 (a). In this state, when the circuit breaker 2 of the switch gear is disconnected and the earthing switch 9 is switched from "off" to "on", first, the key is inserted into the first lock 14, The shutter 13 can be opened by unlocking the shutter 13, so that the shutter 13 is slid while holding the knob 20. Next, the operation handle 11 is inserted into the insertion port 12 to rotate the operation shaft 10, and the earthing switch 9 is turned " on ". The camshaft 16 and the first cam 17 are also rotated.

Next, the operation handle 11 is pulled out from the insertion port 12, the shutter 13 is closed, and the second lock 15 is corrected (Fig. 7 (b)). In this state, since the earthing switch 9 is locked in the "on" state and the shutter 13 is also locked in the "closed" state, the operation handle 11 can not be inserted. Therefore, it is possible to prevent the earthing switch 9 from being switched by mistake.

When the earthing switch 9 is turned from "on" to "off", the reverse order is performed.

The key operation of each lock 14, 15 is normally performed by inserting a key into the lock and rotating the key with one hand. An excessive force of the latching operation is exerted toward the center of the camshaft 16 when an excessive force is exerted on the latching operation due to erroneous operation of the key. Since the camshaft 16 is firmly fixed by a bearing or the like, even if a somewhat excessive force is applied due to an erroneous operation of the key, the camshaft 16 is not damaged and the strength of the camshaft 16 can be easily increased It is possible.

Next, another embodiment will be described as the above modification.

Although the first and second locks are used in Figs. 1 to 7 described above, the switchgears described below are cases where lock is one. The overall configuration of the switchgear is the same as that of Fig. 1, and a description thereof will be omitted.

8 is an explanatory diagram showing the relationship between the opening and closing state of the shutter and the earthing switch of the interlock mechanism portion of the switchgear and the rotation position of the cam when the lock is one. 8A and 8B are diagrams showing the relationship between the opening and closing positions of the shutter 13 and the second cam 23, b " indicates the case where the shutter 13 is " closed ". 8C are diagrams showing the relationship between the operating position of the earthing switch 9 and the turning position of the first cam 22. Fig. , and (d) show when the earthing switch 9 is "off". 9 is a diagram for explaining the rotational position of the cams and the corrective relationship of the locks.

In addition, the lock described here uses a lock which is not in the locked state, and in which the key is not released in the revised state, and one key is used for the lock (14). However, in the case where it is not necessary to interlock, and it is sufficient to merely lock the earthing switch in each of the "on" state and the "off" state, the key may be exited in either state of correction or revision.

The second cam 23, which rotates in conjunction with the movement of the shutter 13, is provided with a concave portion 23a at one position in the circumferential direction. Likewise, the concave portion 22a of the first cam 22 that rotates in conjunction with the rotation of the operating shaft 10 is also provided at only one position in the circumferential direction. Only one lock that locks the movement of both cams is provided at a position corresponding to the first lock described so far. Although there is only one lock, it will be referred to as the first lock 14 for convenience, in accordance with the description so far.

When the shutter 13 is open as shown in Fig. 8A, the first lock 14 can not be corrected. 8 (b), when the shutter 13 is closed, the concave portion 23a of the second cam 23 rotates to the position of the latch 14a of the first lock 14, The lock 14 can be corrected.

8 (c), when the grounding switch 9 is "on", the concave portion 22a is rotated to the position of the latch 14a to correct the first lock 14, When the switch 9 is " off ", the first lock 14 can not be corrected as shown in (d).

9, the concave portion 22a of the first cam 22 and the concave portion 23a of the second cam 23 jointly move together with the first lock 14 The first lock 14 can be corrected only when it comes to the opposed position of the latch 14a.

That is, the first lock 14 can be locked when the earthing switch 9 is "ON" and the shutter 13 is "CLOSED". When the shutter 13 is opened, the first lock 14 can not be corrected. Further, when the first lock 14 is locked, it is impossible to open the shutter 13, so that the operation of the earthing switch 9 impossible.

In this way, even when the lock for locking the cam is 1, the ground switch is turned on, that is, when the key is pulled out in the grounded state, during the operation under the grounding condition at the time of maintenance and inspection, It is possible to ensure the grounding and maintain the grounding state.

8 and 9, the position of the concave portion 22a of the first cam 22 is changed so that the grounding switch 9 is turned off when the grounding switch 9 is turned on, It is also possible to make it possible to correct it when it is.

Although the camshaft 16 with both cams is provided separately from the operating shaft 10 of the earthing switch 9 in the above description, the camshaft 16 may be provided on the operating shaft 10 of the earthing switch 9 The cam may be directly mounted to constitute the key interlock. In this case, the camshaft is unnecessary, and space can be saved.

In the above explanation, the opening / closing device to be interlocked is a grounding switch. However, the present invention is not limited to this. The switch may be an open / close device that is accommodated in the switch gear and manually operated. .

As described above, according to the switchgear of the first embodiment, the opening and closing device and its operating shaft are accommodated in the case, and the operating shaft is rotated from the outside of the case to turn the operating shaft on and off The switchgear includes a shutter that opens and closes an opening of an operation handle formed in the case, a first cam that rotates in conjunction with rotation of the operation shaft, a second cam that rotates in conjunction with opening and closing operations of the shutter, Since the key interlock mechanism has a lock that allows the latch to engage with the recess formed in the outer periphery of the first cam and the second cam when the shutter is "closed" or "off" and the shutter is "closed" The number of components constituting the key interlock mechanism can be reduced and the cost can be reduced as compared with the prior art.

In addition, as the number of parts is reduced, the space constituting the key interlock can be reduced, and space saving of the device can be achieved.

In addition, since the rotation of the operating shaft of the opening and closing device can be locked and the insertion of the operating handle can be locked at the same time, it is possible to prevent the operation handle from being mistakenly manipulated during the locking of the operating shaft to deteriorate the function of the interlock.

When the opening / closing device is in the "off" state and the shutter is in the "closed" state, the first lock that can be locked by engaging the latch with the recess formed in the first cam and the second cam, Quot; closed ", the latches are engaged with the concave portions provided in the first cam and the second cam to have the second lock that can be corrected. Therefore, when the opening / closing device is in the " The above effects can be obtained.

Embodiment 2 Fig.

10 is an explanatory diagram showing the relationship between the open / close position of the shutter of the interlock mechanism portion of the switchgear according to Embodiment 2 and the rotation position of the cam. Fig. 10A shows the case where the shutter is opened, and Fig. 10B shows the case when the shutter is " closed ". 11 is an explanatory diagram showing the relationship between the open / close position of the opening / closing device of the interlock mechanism and the rotation position of the cam. Fig. 11A shows a case where the disconnecting switch to be described next is "grounding", Fig. 11B shows a case where the disconnecting device is "disconnecting", and Fig. 11C shows a case where the disconnecting device is "connecting". The overall configuration of the switchgear is the same as that of Fig. 1 of the first embodiment, and a description thereof will be omitted.

In the present embodiment, the opening / closing device to be interlocked is a three-point (point) disconnecting device. That is, it is a disconnector that can perform "connection", "disconnect" and "grounding" of an electric circuit by one switch depending on the position of the blade.

A mechanism portion provided on a camshaft rotating in association with an operation shaft of the three-pointed disconnecting device and having a first cam that rotates together with the camshaft and a second cam that rotates in conjunction with opening and closing of the shutter is the same as that of Embodiment 1. [ The same parts as those in the first embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted.

As shown in Fig. 10, in addition to the first lock 14 and the second lock 15 which are the same as those of the first embodiment, the lock that locks the rotation of the cam is provided with the third lock 24 at the middle portion thereof have.

The second cam 26 that rotates in conjunction with the left and right motions of the shutter 13 has concave portions 26a to 26c at three positions spaced by 90 degrees in the circumferential direction, 14, a second lock 15, and a third lock 24 are provided at three places.

When the shutter 13 is opened, the positions of the recesses 26a to 26c are in the same positions as in (a), and any locks 14, 15, and 24 can not be corrected. And can be corrected as in (b) only when the shutter 13 is " closed ". However, in relation to the first cam 25 to be described next, in practice, only one lock can be corrected.

11, when the three-point disconnector is in the "grounded" state, the first cam 25 rotates in conjunction with the drive shaft 10 of the three-point isolator, and the first cam 25 rotates, The concave portion 25a of the first lock 14 comes to the position of the first lock 14. (B), the concave portion 25a pivots to the position of the third lock 24 and the concave portion 25a rotates to the position of the second lock 24 when it is in the " To the position of the lock 15, and the lock corresponding to each position thereof becomes correctable.

Therefore, when the shutter 13 is in the " closed " state and the first cam 25 is in any one of the positions in Fig. 11, the operation handle 11 is moved to the handle insertion opening 12, It is possible to lock the opening / closing operation of the three-point disconnecting switch.

As described above, according to the switchgear of the second embodiment, the three-point disconnecting switch and its operating shaft are accommodated inside the case by means of a single switch for "connection", "disconnect" and "grounding" A switchgear configured to operate a three-point disconnector by rotating an operation shaft by inserting an operation handle from the outside, the switchgear comprising: a shutter that opens and closes an insertion port of an operation handle formed on the case; a first cam that rotates in conjunction with rotation of the operation shaft; A second cam that rotates in conjunction with the opening and closing operation of the shutter, and a third cam that is in a state of "connection", "disconnect", and "ground" when the three-point disconnector is in the " Since the key interlock mechanism having three locks that can be locked by engaging the latches with the concave portion provided on the outer periphery of the second cam is provided in the switchgear having three points, The respective states of " connection ", " disconnect " and " grounding " of the disconnecting unit can be easily corrected and the same effects as those of the first embodiment can be obtained.

The lock described here uses a lock in which the key is released in the locked state and the key is not released in the revised state and the key is used to lock the lock 14, lock 15 and lock 24, Three are used. However, if it is okay to simply lock the three-point disconnector in each of the "connected", "disconnected", and "grounded" states without interlocking, then the lock 14, lock 15 and lock 24 The same kind of key may be used for the key, or the key may be omitted in either state of correction or revision.

In the switchgear according to the first embodiment or the switchgear in accordance with the second embodiment, the first cam is fixed to the camshaft rotating in association with the rotation of the operating shaft, and the second cam is fixed to the camshaft And when the concave portions of both cams come together at the positions opposite to the latches of one of the locks, the locks at the positions are configured to be correctable. By arranging both cams on the same axis, The installation space can be effectively reduced by compactly assembling the lock mechanism.

The present invention can be freely combined with each embodiment within the scope of the invention, and each embodiment can be suitably modified or omitted.

1: Case 1a: Slit
2: Circuit breaker 3a, 3b:
4: bus 5: branch conductor
6: Cable 7: Connection conductor
8: Current transformer 9: Grounding switch
10: Operation shaft 10a:
11: Operation handle 12: Handle opening
13: shutter 13a: engaging hole
14: first lock 14a, 15a, 24a: latch
15: second lock 16: camshaft
17, 22, 25: first cam
17a, 17b, 18a, 18b, 22a, 23a, 25a, 26a to 26c:
18, 23, 26: second cam 19: engaging pin
20: Knob 21: Link lever
24: Third Rock

Claims (4)

In a switchgear configured to accommodate an opening and closing device and an operating shaft thereof in a case, and to open and close the opening and closing device by rotating the operating shaft by inserting an operating handle from the outside of the case ,
A shutter for opening and closing the insertion port of the operation handle formed in the case;
A first cam that rotates in conjunction with rotation of the operating shaft,
A second cam that rotates in conjunction with an opening and closing operation of the shutter,
When the opening / closing device is "on" or "off" and the shutter is "closed", the latch is engaged with the concave portion provided on the outer periphery of the first cam and the second cam to lock the lock,
And a key interlock mechanism having the key interlock mechanism. The method according to claim 1,
A first lock which can be locked by engaging a latch with the recess formed in the first cam and the second cam when the opening / closing device is "off" and the shutter is "closed"
And a second lock which can be locked by engaging the latch with the recess formed in the first cam and the second cam when the opening and closing device is "on" and the shutter is "closed". A three-point (point) disconnecting unit for performing "connection", "interruption" and "grounding" of the electric circuit by one switch is housed in the case and the operation shaft is received from the outside of the case, And a control circuit for controlling the three-pointed disconnector by rotating the operating shaft,
A shutter for opening and closing the insertion port of the operation handle formed in the case;
A first cam that rotates in conjunction with rotation of the operating shaft,
A second cam that rotates in conjunction with an opening and closing operation of the shutter,
When the three-point disconnector is in the state of "connection", "disconnection", or "grounding", and when the shutter is "closed", the recesses provided on the outer periphery of the first cam and the second cam Three locks lockable by latching
And a key interlock mechanism having the key interlock mechanism. The method according to any one of claims 1 to 3,
Wherein the first cam is fixed to a camshaft rotating in conjunction with rotation of the operating shaft,
The second cam is rotatably provided on the cam shaft,
Wherein when said concave portion of said cams come together at a position opposite to the latch of one of said locks, said lock at said position is able to be corrected.

Images