JPWO2014010110A1 - Switchgear - Google Patents

Abstract

The switchgear and its operation shaft (10) are housed in the housing (1), and the switchgear is opened by inserting the operation handle (11) into the insertion port (12) from the outside and rotating the operation shaft (10). The switch gear is configured to be turned on and off, and is fixed to a shutter (13) that opens and closes the insertion port (12) and a cam shaft (16) that rotates in conjunction with the rotation of the operation shaft (10). When the first cam (17), the second cam (18) rotating in conjunction with the opening / closing operation of the shutter (13), and the opening / closing device are “off” and the shutter (13) is “closed” The first lock (14) that can be locked by engaging the latches in the recesses provided in the cams (17, 18), and the cams (17) when the opening / closing device is "ON" and the shutter is "CLOSED" , 18) and a second lock (15) that can be locked by engaging a latch with a recess. With an interlock mechanism.

Description

  The present invention relates to a switchgear having a key interlock mechanism in which a switching device such as a disconnecting switch or a grounding switch is accommodated in a housing, and is locked in an “on” or “off” state of the switching device. .

When maintaining and inspecting the switchgear high-voltage circuit, it is necessary to turn off the upper and lower system switches connected from the switchgear and ground the circuit to be inspected. . Since there is a possibility that residual charges remain in the circuit when not in the grounded state, there is a possibility that a contact with a charged part or a short-circuit accident may occur. For this reason, the grounding switch is locked in the “grounded” state and the key can be removed so that the key can be mechanically locked in the grounded state. By opening the switchgear door that is grounded along with the grounding, it is necessary to have a structure that prevents contact with the charging part and occurrence of short-circuit accidents when the switchgear circuit is maintained and inspected.
In addition, when the circuit is grounded, operating the grounded circuit switch and applying a voltage to the circuit may cause a ground fault. Is locked in the “disconnected” state and the key can be removed, so that it is mechanically locked in the disconnected state, and the associated switch is operated using this removed key to apply voltage to the circuit. It is necessary to have a structure that can prevent the occurrence of a ground fault by enabling the application.

In order to solve the above problems, as a conventional key interlock device of a switchgear, for example, an interlock latch lock (locking mechanism) is provided in each of the circuit breaker and disconnector connected to the same circuit of the switchboard, Of these, the interlock for the disconnector is provided with a recess corresponding to the closing and opening positions of the disconnector on the outer periphery of the cam plate fixed to the disconnector operating shaft, and the latch lock rod can be engaged with the recess of the cam plate. Is arranged. By turning the disconnector operating shaft with the operating handle and locking it in the open or closed position, the rod engages with the recess and locks the state (see, for example, Patent Document 1).
In addition, an operation shaft with an detachable operation handle at the end has an operation shaft for operating the open / close of the disconnector, and an operation shaft that is provided on the prismatic portion of the operation shaft and slides to a position that covers and exposes the prism A cylindrical operation piece that rotates together, two rod pins that can be engaged with pin holes provided at two locations in the circumferential direction of the operation piece, and two locks that press the rod pin by locking. When the lock pin is operated to engage the rod pin with the pin hole of the operation piece at the rotation position of the operation piece corresponding to the disconnection state and the insertion state of the operation piece, the operation piece is fixed at the position covering the prism portion, and the operation handle There is disclosed a key interlock that is configured such that cannot be inserted (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 61-84609 (page 4-6, Fig. 7-8) Japanese Patent Laid-Open No. 02-193506 (5th page, FIG. 3-4)

In the interlock mechanism of the disconnector as in Patent Document 1, since the latch is engaged with the recess of the cam plate that moves in conjunction with the operation of the disconnector, the operation of the disconnector is locked. Thus, there is a problem that the cam plate and the latch portion may be damaged if an excessive force is applied to the operation handle by mistake.
In the key interlock disclosed in Patent Document 2, the rod pin that becomes the latch of the key interlock is engaged with the pin hole of the operation piece provided on the operation shaft of the disconnector to lock the operation of the disconnector, and at the same time the disconnector is operated. Although it is a structure which locks insertion of a handle | steering-wheel, there existed a problem that the number of parts, such as a rod pin and an operation piece, increased, and it was necessary to ensure the installation space of components widely.

  The present invention has been made in order to solve the above-described problems, and there is no risk that the interlock function may be impaired due to an excessively large force during the interlock operation, and the number of parts can be reduced. It aims at providing the switchgear provided with.

  The switchgear according to the present invention is configured such that an opening / closing device and its operation shaft are accommodated in a housing, and the opening / closing device is turned on and off by inserting an operation handle from the outside of the housing and rotating the operation shaft. In the switchgear, the shutter that opens and closes the insertion opening of the operation handle formed in the housing, the first cam that rotates in conjunction with the rotation of the operation shaft, and the rotation that operates in conjunction with the opening and closing operation of the shutter. The second cam that moves, and when the open / close device is "ON" or "OFF" and the shutter is "CLOSE", the latch can be locked by engaging the latches on the outer periphery of the first cam and the second cam. And a key interlock mechanism having a lock.

  In addition, a three-point disconnector and its operating shaft are housed inside the case, and the operation shaft is inserted and operated from the outside of the case. In a switchgear configured to operate a three-point disconnector by rotating the shaft, a shutter that opens and closes the insertion opening of the operation handle formed in the housing, and rotates in conjunction with the rotation of the operation shaft. The first cam that moves, the second cam that rotates in conjunction with the opening / closing operation of the shutter, and the three-point disconnector are in one of the states of “connection”, “disconnection”, and “ground”, and the shutter Includes a key interlock mechanism having three locks that can be locked by engaging a latch with a recess provided on the outer periphery of the first cam and the second cam. .

According to the switchgear of the present invention, the shutter that opens and closes the insertion opening of the operation handle, the first cam that rotates in conjunction with the rotation of the operation shaft, and the first that rotates in conjunction with the opening and closing operation of the shutter. And a lock that can be locked by engaging a latch with a recess provided on the outer periphery of the first cam and the second cam when the opening / closing device is “on” or “off” and the shutter is “closed”. Therefore, the number of parts constituting the key interlock mechanism can be reduced and the cost can be reduced as compared with the prior art disclosed in Patent Document 2.
Further, as the number of parts is reduced, the space constituting the key interlock can be reduced, and the space of the device can be saved.
In addition, since the rotation of the operating shaft of the opening / closing device can be locked and the insertion of the operating handle can be locked at the same time, it can be avoided that the operating handle is accidentally operated while the operating shaft is locked and the interlock function is impaired. .

  Further, a shutter that opens and closes the insertion opening of the operation handle, a first cam that rotates in conjunction with the rotation of the operation shaft, a second cam that rotates in conjunction with the opening and closing operation of the shutter, and three points When the disconnector is in "connected", "disconnected", or "grounded" state, and the shutter is "closed", the latch is engaged with the recesses provided on the outer periphery of the first and second cams. Since the key interlock mechanism having the three locks that can be locked is provided, the same effect as described above can be obtained in the switch gear having the three-point disconnector.

1 is a front view and a side sectional view of a switchgear according to Embodiment 1 of the present invention; It is the front view and bottom view which show the interlock mechanism part of FIG. It is the perspective view which looked at the interlock mechanism part of FIG. 2 from the front upper right. FIG. 3 is a detailed view of a first cam and a second cam of the interlock mechanism portion of FIG. 2. It is a perspective view which shows the principal part of FIG. It is explanatory drawing which shows the relationship between the operation position of the shutter and earthing switch of FIG. 2, and the rotation position of a cam. It is explanatory drawing which shows the relationship between the rotation position of each cam of FIG. 2, and locking. It is explanatory drawing of the operation position of the shutter of an interlock mechanism part, the earthing switch, and the rotation position of a cam which show the other Example of the switchgear by Embodiment 1 of this invention. It is explanatory drawing which shows the relationship between the rotation position of the cam of FIG. 8, and locking. It is explanatory drawing which shows the relationship between the opening / closing position of the shutter of the interlock mechanism part of the switchgear by Embodiment 2 of this invention, and the rotation position of a 2nd cam. It is explanatory drawing which shows the relationship between the opening-and-closing position of the three-point disconnector of the interlock mechanism part of Embodiment 2, and the rotation position of a 1st cam.

Embodiment 1 FIG.
1A and 1B show an overall configuration of a switchgear according to Embodiment 1, wherein FIG. 1A is a front view and FIG. 1B is a side sectional view. 2 is an enlarged view of the interlock mechanism portion of FIG. 1, wherein (a) is a front view and (b) is a bottom view thereof.
First, the overall structure of the switchgear according to the first embodiment will be described with reference to FIG.
The interior of the metal housing 1 is partitioned into a plurality of compartments. A drawer-type circuit breaker 2 is accommodated in the circuit breaker chamber on the front side so that it can be pulled out from the front side, and a disconnection portion 3a of the main circuit is provided on the rear wall of the circuit breaker chamber at a predetermined interval in the vertical direction. , 3b are fixedly attached to and detachable from the connection terminal protruding from the back surface of the circuit breaker 2.

The upper side of the circuit breaker chamber on the back side is a bus bar chamber, a three-phase bus bar 4 is supported by a support insulator (not shown), and the bus bar 4 is a disconnect to which one end side of the circuit breaker 2 is connected. The main circuit terminal of the part 3 a is connected to the branch conductor 5.
Below the bus room on the back side of the circuit breaker room is a cable room for accommodating the cable 6 on the load side. The cable 6 is connected to the main circuit terminal of the disconnecting portion 3b to which the other end side of the circuit breaker 2 is connected. Connected by a connection conductor 7, a current transformer 8 is provided through the connection conductor 7. Further, a ground switch 9 is connected to the disconnecting portion 3 b side via a connection conductor 7. An operation shaft 10 for opening and closing the earthing switch 9 is horizontally disposed from the earthing switch 9 toward the front side of the housing 1, and an operation handle 11 is provided at an end portion on the front side. A detachable fitting portion is formed.

As shown in FIG. 1A, a handle insertion port 12 into which an operation handle 11 can be inserted is provided at the position of the operation shaft 10 on the front side of the housing 1. A shutter 13 (see FIGS. 2, 3, and 5 for details) that can open and close the handle insertion port 12 is provided between the end 10. With the shutter 13 in the open state, the operation handle 11 is inserted into the handle insertion port 12 and is fitted to the end of the operation shaft 10, for example, is engaged with a protrusion 10a (see FIG. 3) provided at the end. By rotating the shaft 10, the blade of the ground switch 9 swings so that the ground position “ON” and the disconnect position “OFF” can be switched.
Further, a first lock 14 and a second lock 15 that lock the movement of the shutter 13 and the rotation of the operation shaft 10 in conjunction with a cam described later are provided on the front side of the housing 1. The key interlock mechanism is configured in the part.
The internal configuration of the switch gear is an example and is not limited to FIG.

Since the present invention has a feature in the key interlock mechanism, the key interlock mechanism will be described next with reference to FIGS.
2A is an enlarged view of the frame portion of the housing 1 provided with the first and second locks 14 and 15 of FIG. 1A, and FIG. 2B is a view of FIG. FIG.
FIGS. 3A and 3B are perspective views of the key interlock mechanism as viewed from the upper right of the front. FIG. 3A shows a state in which the shutter 13 is opened, and FIG. 3B shows a state in which the shutter 13 is closed. However, illustration of each lock is omitted.

As shown in FIGS. 2 and 3, a cam shaft 16 that is connected and rotated by a link lever 21 in conjunction with the rotation of the operation shaft 10 is supported and provided in the housing 1. ing. In the vicinity of the shaft end on the front surface side of the cam shaft 16, a first cam 17 is provided that is fixed to the cam shaft 16 and rotates together with the cam shaft 16. A moving second cam 18 is provided on the cam shaft 16 so as to be rotatable in the vicinity of the first cam 17. One end side of the shutter 13 is engaged with an engagement pin 19 provided on the second cam 18.
Further, a knob 20 protruding outward from the slit 1a provided in the housing 1 is provided on the other end side of the shutter 13. When the slider 20 is held and slid in the left-right direction when viewed from the front side, the left end Then, as shown in FIG. 3A, the shutter 13 is opened, the handle insertion port 12 on the front surface of the housing 1 is opened, and at the right end, the handle insertion port 12 is closed by the shutter 13 as shown in FIG. It has become.

The shape of the cam will be described with reference to FIG. (A) is the 1st cam 17 fixed to the cam shaft 16, and rotates with the cam shaft 16, (b) is the side view. The first cam 17 has a disc shape and is provided with recesses 17a and 17b cut out toward the axial center at two positions 90 ° apart from the outer periphery. In the figure, the recesses 17a and 17b are shown as being connected to one, but depending on the size of the recess, a recess notched in a U-shape as shown in (c) may be provided individually. Also good.
(C) is a front view of the second cam 18 that rotates in conjunction with the opening / closing operation of the shutter 13, and (d) is a side view thereof. The second cam 18 has a disk shape and is provided with recesses 18a and 18b cut out toward the axial center at two positions 180 ° apart on the outer periphery. An engagement pin 19 that engages 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 part of the key interlock mechanism, as viewed from the front side. A first lock 14 and a second lock 15 are arranged on both sides of the first cam 17 and the second cam 18 in the radial direction, and are fixed to the housing 1 side. Each lock is provided with a latch that is entered and exited by key operation, and the latch 14a of the first lock 14 and the latch 15a (see FIG. 6) of the second lock 15 are directed to the cam surfaces of the cams 17 and 18, respectively. Are opposed to each other. When the concave portions of the first cam 17 and the second cam 18 are both turned to one of the latch positions, the latch of the lock at that position can be protruded by a key operation. That is, the key operation cannot be performed even if only the concave portion of one cam is in the latch position.
The engagement pin 19 of the second cam 18 is engaged with an engagement hole 13 a provided at one end of the shutter 13, and the second cam 18 is interlocked with the left and right movement of the shutter 13. Is pivotable about the axis. That is, the second cam 18 is coaxial with the first cam 17 but can be operated individually.

Next, the operation of the interlock mechanism will be described with reference to FIGS.
FIG. 6 is a diagram showing the rotation position of each cam and the locking relationship of each lock. (A) And (b) is a figure which shows the relationship between the opening-and-closing position of the shutter 13, and the rotation position of the 2nd cam 18, (a) is when the shutter 13 is open, (b) is the shutter 13 Shows when is closed. When the shutter 13 is open, neither lock 14, 15 can be locked. Further, when the shutter 13 is closed, the locks 14 and 15 can be locked. However, (a) and (b) are diagrams for explaining only the relationship between the position of the shutter 13 and the locks 14 and 15. In actual operation, both the locks 14 and 15 are related to the first cam 17. Cannot be locked at the same time.
(C) And (d) is a figure which shows the relationship between the opening / closing position of the earthing switch 9 and the rotation position of the 1st cam 17, (c) is when the earthing switch 9 is "OFF", (D) shows a case where the ground switch 9 is “ON”. When the ground switch 9 is “OFF”, the first lock 14 can be locked, and when the ground switch 9 is “ON”, the second lock 15 can be locked.
The lock described here uses a lock that is unlocked in the locked state and cannot be unlocked in the unlocked state, and a total of two different keys, one for each of the lock 14 and the lock 15. I use it. However, when the ground switch 9 is simply locked in the “on” and “off” states without requiring an interlock, the same type of key is used for the lock 14 and the lock 15. The key may be removed either in the locked or unlocked state.

  FIG. 7 is a view for explaining the rotational positions of the first cam 17 and the second cam 18 and the locking relationship between the locks 14 and 15 and shows a state seen from the front side. Although the outer diameters of the first cam 17 and the second cam 18 are substantially the same, the first cam 17 is slightly reduced and shown by a broken line for easy understanding. As shown in (a), when the concave portion 17a of the first cam 17 and the concave portion 18a of the second cam 18 come to the opposite positions of the latch 14a of the first lock 14, the first lock 14 is locked. be able to. Further, as shown in (b), when the concave portion 17b of the first cam 17 and the concave portion 18b of the second cam 18 come to the opposite positions of the latch 15a of the second lock 15, the second lock 15 is Can be locked.

  This will be described with reference to FIG. 6. When the grounding switch 9 is “OFF” and the shutter 13 is “CLOSED”, only the first lock 14 can be locked, and when the grounding switch 9 is “ON”, the shutter is closed. When 13 is “closed”, only the second lock 15 can be locked. In any case, neither of the locks 14 and 15 can be locked when the shutter 13 is open, and when either of the locks 14 and 15 is locked, the shutter 13 cannot be opened. The ground switch 9 cannot be operated.

In the normal operation state of the switchgear, the ground switch 9 is in a disconnected state, that is, “OFF”, and the key interlock mechanism is in the state shown in FIG. When the switchgear circuit breaker 2 is disconnected from this state and the ground switch 9 is switched from “OFF” to “ON”, first, the shutter 13 is opened by inserting a key into the first lock 14 and unlocking it. Therefore, the shutter 13 is slid by the knob 20 and opened. Next, the operation handle 11 is inserted into the insertion opening 12 to rotate the operation shaft 10, and the ground switch 9 is turned “ON”. In conjunction with this, the cam shaft 16 and the first cam 17 also rotate.
Next, the operation handle 11 is removed from the insertion port 12, the shutter 13 is closed, and the second lock 15 is locked (FIG. 7B). In this state, since the ground switch 9 is locked in the “on” state and the shutter 13 is also locked in the “closed” state, the operation handle 11 cannot be inserted. Therefore, it is possible to prevent the ground switch 9 from being erroneously switched.
When the ground switch 9 is changed from “ON” to “OFF”, the procedure is reversed.

  The key operation of each lock 14 and 15 is usually performed by inserting a key into the lock and rotating the key with one hand to operate the latch. If an excessive force is applied forcibly during the latch operation due to an erroneous key operation, an excessive force for the latch operation is applied toward the center of the cam shaft 16. Since the camshaft 16 is firmly fixed by a bearing or the like, even if an excessive force is applied due to an erroneous operation of the key, the camshaft 16 will not be damaged, and the camshaft 16 can be easily increased in strength if necessary. it can.

Next, another embodiment will be described as the above modification.
In FIGS. 1 to 7 described so far, the first and second locks are used, but the switchgear described next is a case where there is one lock. The overall configuration of the switch gear is the same as that in FIG.
FIG. 8 is an explanatory diagram showing the relationship between the open / close state of the shutter and grounding switch of the interlock mechanism portion of the switch gear and the rotational position of the cam when there is one lock. (A) (b) is a figure which shows the relationship between the opening-and-closing position of the shutter 13, and the rotation position of the 2nd cam 23, (a) is the shutter 13 "open", (b) is the shutter 13 " It shows the time of “Closed”. (C) (d) is a figure which shows the relationship between the operation position of the earthing switch 9 and the rotation position of the 1st cam 22, (c) is earthing switch 9 "on", (d) is It shows a case where the ground switch 9 is “OFF”. Moreover, FIG. 9 is a figure explaining the rotation position of both cams, and the locking relationship of a lock.
Note that the lock described here uses a lock that is unlocked in the locked state and cannot be removed in the unlocked state, and one key is used for the lock 14. However, if you do not need an interlock and simply lock the ground switch in the “on” or “off” state, the key can be removed in either the locked or unlocked state. Good.

The second cam 23 that rotates in conjunction with the movement of the shutter 13 has a recess 23a formed at one location in the circumferential direction. Similarly, the recess 22a of the first cam 22 that rotates in conjunction with the rotation of the operation shaft 10 is also provided at only one location 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 the sake of convenience together with the description so far.
When the shutter 13 is opened as shown in FIG. 8A, the first lock 14 cannot be locked. When the shutter 13 is closed as shown in (b), the recess 23a of the second cam 23 rotates to the position of the latch 14a of the first lock 14 to lock the first lock 14. Can do.
When the grounding switch 9 is “ON” as shown in (c), the recess 22a is rotated to the position of the latch 14a so that the first lock 14 can be locked. ", It becomes as shown in (d) and the first lock 14 cannot be locked.

The above operations are individual operations. Actually, as shown in FIG. 9, the concave portion 22 a of the first cam 22 and the concave portion 23 a of the second cam 23 are both located at positions opposite to the latch 14 a of the first lock 14. Only when can the first lock 14 be locked.
That is, the first lock 14 can be locked when the ground switch 9 is “ON” and the shutter 13 is “CLOSED”. When the shutter 13 is open, the first lock 14 cannot be locked, and when the first lock 14 is locked, the shutter 13 cannot be opened, so that the ground switch 9 cannot be operated.

  In this way, even when only one lock is used to lock the cam, the grounding switch is “on”, that is, grounded, and the key is removed so that it can be removed when working under grounding conditions during maintenance and inspection. If an interlock that can enter the switchgear is assembled using a key, the grounding can be reliably performed and the grounding state can be maintained.

  8 and 9, the ground switch 9 is locked when it is “ON”. However, the position of the recess 22a of the first cam 22 is changed so that the ground switch 9 is “OFF”. It is also possible to lock it when

In the above description, the cam shaft 16 to which both cams are attached is provided separately from the operation shaft 10 of the ground switch 9, but the cam is directly attached to the operation shaft 10 of the ground switch 9. The key interlock may be configured. In that case, the camshaft is unnecessary, and further space saving is possible.
Further, in the description so far, the switching device to be interlocked is a grounding switch. However, the present invention is not limited to this, and any switching device that is housed in a switchgear and is manually operated, for example, It can also be applied to disconnectors.

As described above, according to the switch gear of the first embodiment, the opening / closing device and its operation shaft are accommodated inside the housing, and the operation handle is rotated by inserting the operation handle from the outside of the housing. In a switchgear configured to turn on and off an opening / closing device, a shutter that opens and closes an insertion port of an operation handle formed in a housing, a first cam that rotates in conjunction with rotation of an operation shaft, and a shutter A second cam that rotates in conjunction with the opening / closing operation of the first cam, and a recess provided on the outer periphery of the first cam and the second cam when the opening / closing device is “on” or “off” and the shutter is “closed”. Since the key interlock mechanism having a lock that can be locked by engaging the latch is provided, the number of parts constituting the key interlock mechanism can be reduced and the cost can be reduced compared to the prior art as in Patent Document 2. Can be achieved.
Further, as the number of parts is reduced, the space constituting the key interlock can be reduced, and the space of the device can be saved.
In addition, since the rotation of the operating shaft of the opening / closing device can be locked and the insertion of the operating handle can be locked at the same time, it can be avoided that the operating handle is accidentally operated while the operating shaft is locked and the interlock function is impaired. .

  Further, when the opening / closing device is “OFF” and the shutter is “CLOSED”, the first lock that can be locked by engaging the latch with the recesses provided in the first cam and the second cam, and the opening / closing device is “ When the shutter is "closed" with "on", the latches are engaged with the recesses provided in the first cam and the second cam, and the second lock that can be locked is provided. Each of the “OFF” state and the “ON” state can be interlocked, and the above effect can be obtained.

Embodiment 2. FIG.
FIG. 10 is an explanatory diagram showing the relationship between the opening / closing position of the shutter of the interlock mechanism portion of the switchgear and the rotational position of the cam according to the second embodiment. (A) shows when the shutter is “open”, and (b) shows when the shutter is “closed”. Moreover, FIG. 11 is explanatory drawing which shows the relationship between the opening / closing position of the opening / closing apparatus of an interlock mechanism part, and the rotation position of a cam. (A) shows when the disconnector described below is “ground”, (b) shows when the disconnector is “disconnected”, and (c) shows when the disconnector is “connected”. The overall configuration of the switch gear is the same as that of FIG.
In the present embodiment, the switching device to be interlocked is a three-point disconnector. That is, it is a disconnector capable of performing “connection”, “disconnection”, and “grounding” of the electric circuit with one switch depending on the position of the blade.
A mechanism having a first cam that is provided on a cam shaft that rotates in conjunction with the operating shaft of the three-point disconnector, and that rotates in conjunction with opening and closing of the shutter. Is the same as in the first embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 10, in addition to the first lock 14 and the second lock 15 similar to those in the first embodiment, the lock that locks the rotation of the cam includes a third lock 24 in the middle portion thereof. ing.
The second cam 26 that rotates in conjunction with the left and right movement of the shutter 13 has recesses 26a to 26c at three positions that are 90 degrees apart in the circumferential direction, and the first lock is provided so as to be able to cope with it. 14, second lock 15 and third lock 24 are provided at three locations.
When the shutter 13 is “open”, the recesses 26a to 26c are positioned as shown in (a), and none of the locks 14, 15, and 24 can be locked. Only when the shutter 13 is “closed”, it can be locked as shown in FIG. However, only one of the locks can actually be locked in relation to the first cam 25 described below.

As shown in FIG. 11, when the three-point disconnector is in the “grounding” state (a), the first cam 25 rotates in conjunction with the drive shaft 10 of the three-point disconnector, The recess 25 a of the cam 25 comes to the position of the first lock 14. Similarly, when (b) is in the “disconnected” state, the recess 25a rotates to the position of the third lock 24, and when (c) is in the “connected” state, the recess 25a is the second lock 15. And the locks corresponding to these positions can be locked.
Therefore, when the shutter 13 is “closed” and the first cam 25 is in any position of FIG. 11, the operation handle 11 cannot be inserted into the handle insertion opening 12 by locking the lock in the corresponding position. Therefore, the opening / closing operation of the three-point disconnector can be locked.

As described above, according to the switchgear of the second embodiment, the three-point disconnector that performs “connection”, “disconnection”, and “grounding” of the electric circuit with one switch and the operation shaft are accommodated in the housing. In the switch gear configured to operate the three-point disconnector by inserting the operating handle from the outside of the housing and rotating the operating shaft, the opening of the operating handle formed in the housing is opened and closed The three-point disconnector is “connected”, “disconnected”, the first cam that rotates in conjunction with the rotation of the operating shaft, the second cam that rotates in conjunction with the opening / closing operation of the shutter, Three locks that can be locked by engaging the latches with the recesses provided on the outer periphery of the first cam and the second cam when the shutter is in the “closed” state. And a switch having a three-point disconnector. In Ya, the respective states of "connection", "disconnector""ground" of the three-point disconnectors easily locked, and it is possible to obtain the same effect as in the first embodiment.
Note that the lock described here uses a lock that is unlocked in the locked state and cannot be unlocked in the unlocked state, and the keys are different from each of the locks 14, 15, and 24. A total of three are used. However, in the case where it is only necessary to lock the three-point disconnector in the “connected”, “disconnected”, and “grounded” states without requiring an interlock, the same applies to the locks 14, 15 and 24. A type of key may be used, and the key may be removed in either a locked or unlocked state.

  In the switchgear in which the switchgear as in the first embodiment or the disconnector as in the second embodiment is accommodated, the first cam is a cam shaft that rotates in conjunction with the rotation of the operation shaft. The second cam is pivotally provided on the cam shaft, and when the concave portions of both cams come to the position facing either latch of the lock, the lock at that position can be locked. Since the two cams are arranged on the same shaft, the key interlock mechanism can be made compact and the installation space can be effectively reduced.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

1 housing, 1a slit, 2 circuit breaker, 3a, 3b disconnecting part, 4 busbar,
5 branch conductor, 6 cable, 7 connecting conductor, 8 current transformer,
9 Grounding switch, 10 operation shaft, 10a protrusion, 11 operation handle,
12 Handle insertion port, 13 Shutter, 13a Engagement hole,
14 first lock, 14a, 15a, 24a latch, 15 second lock,
16 Cam shaft, 17, 22, 25 First cam, 17a, 17b,
18a, 18b, 22a, 23a, 25a, 26a-26c recess,
18, 23, 26 Second cam, 19 engagement pin, 20 knob,
21 Link lever, 24 Third lock.

Claims (4)

In a switchgear configured to house an opening / closing device and its operation shaft inside a housing, and to turn on / off the opening / closing device by inserting an operation handle from the outside of the housing and rotating the operation shaft ,
A shutter that opens and closes an insertion port of the operation handle formed in the housing;
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;
A lock that can be locked by engaging a latch with a recess provided on the outer periphery of the first cam and the second cam when the opening / closing device is "on" or "off" and the shutter is "closed";
A switchgear comprising a key interlock mechanism having The switchgear according to claim 1, wherein
When the opening / closing device is “off” and the shutter is “closed”, a first lock that can be locked by engaging a latch with the recess provided in the first cam and the second cam;
When the opening / closing device is "ON" and the shutter is "CLOSE", a second lock that can be locked by engaging a latch with the recess provided in the first cam and the second cam;
A switchgear characterized by comprising: A three-point disconnector that performs “connection”, “disconnection”, and “grounding” of the electric circuit with a single switch and its operation shaft are housed inside the case, and an operation handle is inserted from the outside of the case to perform the operation. In a switchgear configured to operate the three-point disconnector by rotating a shaft,
A shutter that opens and closes an insertion port of the operation handle formed in the housing;
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;
Provided on the outer periphery of the first cam and the second cam when the three-point disconnector is in one of the “connected”, “disconnected”, and “grounded” states and the shutter is “closed”. Three locks that can be locked by engaging a latch with the recessed portion,
A switchgear comprising a key interlock mechanism having In the switchgear according to any one of claims 1 to 3,
The first cam is fixed to a cam shaft that rotates in conjunction with rotation of the operation shaft,
The second cam is rotatably provided on the cam shaft,
The switchgear is configured such that when both of the concave portions of the cams come to a position facing the latch of any of the locks, the lock at that position can be locked.

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