JPH0454808A - Control circuit locking unit for truck type circuit breaker - Google Patents

Abstract

PURPOSE:To allow throw-in of a truck type circuit breaker only after connection of plugs by an arrangement wherein a movable lock member responds to connection of circuit through plugs on board side and truck type circuit breaker side and disengages a fixed lock member. CONSTITUTION:In order to form a control circuit, a plug 3 on a distribution board side is connected with a plug 4 on a truck type circuit breaker 1 and a lock lever 11 is rotated in the direction of an arrow A thus locking the connection plug 3. Consequently, one end 7a' of a movable lock member, i.e., the core of a push-pull cable 7, is pushed in and the other end 7a of the core rotates a link 8 counterclockwise around a pin 1e while resisting against a spring 9. Consequently, a lock pin 5 ascends to allow movement of a truck type circuit breaker 1 toward an operating position (right side on the drawing) while riding over a fixed lock member, i.e., a lock board 6. According to the arrangement, the truck type circuit breaker is allowed to be thrown in only after connection of the plugs 3 and 4 while furthermore disconnection of the plugs 3 and 4 is blocked during operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control circuit locking device for a draw-out circuit breaker.

[Prior Art] Conventionally, there are generally three types of connection methods for connecting a control circuit of a draw-out type circuit breaker to a switchboard: connection using a terminal block, plug connection, and automatic connection connection. Functionally, automatic interlocking connections are the best, but they are relatively expensive, so terminal block connections or plug connections are often used for economic reasons, and among them, plug connections that are easy to connect and disconnect are most often used.

[Problems to be Solved by the Invention] In a draw-out type circuit breaker in which the conventional plug connection method as described above is adopted for the control circuit, the connection plug is not connected to the circuit breaker in any of the disconnection positions, test positions, and operating positions. Since it can be attached and detached freely, for example, if the connecting plug is removed from an electrically closed circuit breaker while it is in the operating position, even if a fault current flows, the control circuit will not be connected and the circuit breaker will not be disconnected, causing serious damage. There was a problem in that it could lead to serious accidents.

This invention was made to solve the above-mentioned problems.The circuit breaker cannot be inserted into the operating position unless the connection plug is connected, and the connection plug cannot be inserted in the position range from the test position to the operation position. An object of the present invention is to provide a control circuit locking device for a drawer-type circuit breaker that cannot be removed.

[Means for Solving the Problems] A control circuit locking device for a drawer-type circuit breaker according to the present invention is a drawer-type circuit breaker that connects a control circuit to a panel side through a plug connection. , a locking means for locking the connection state between the connection plug on the panel side and the connection plug of the drawer-type circuit breaker steel; and an operation prevention device located at a predetermined position on the panel to prevent the opening/unlocking operation of the locking means. a fixed locking member provided at a predetermined position on the panel; and a fixed locking member provided on the drawer-type circuit breaker and disengaging/releasing the engagement with the fixed locking member in response to the locking/unlocking action of the locking means. A movable locking member having an engaging portion to be engaged.

[Operation] In this invention, the movable locking member responds to the locking operation of the locking means that locks the connection between the connection plug on the panel side and the connection plug of the draw-out type circuit breaker steel, and releases the engagement with the fixed locking member. do. The operation preventing means prevents the locking means from unlocking at a predetermined position.

[Embodiment] Fig. 3 shows a drawer-type circuit breaker (1) equipped with a control circuit locking device according to an embodiment of the present invention and its fixed part on the switchboard side (
2) is a front view, and FIG. 4 is a side view. In the state shown in the figure, the drawer-type circuit breaker (1) has been inserted to its new path position in the fixed part (2).

In this position, the main circuit terminal (la) of the drawer type circuit breaker (1) is connected to the fixed disconnecting section (2a) of the fixed section (2) on the switchboard side.
), and the connection plug (3) on the switchboard side is detachable from the connection plug (4) on the circuit breaker side. When the connection plugs (3) and (4) are not connected, the locking pin (5) projects downward from the drawer-type circuit breaker (1).

If you try to insert the drawer type circuit breaker (1) further without connecting the connection plugs (3) and (4), the locking pin (5)
hits the locking plate (6) provided at the bottom of the fixing part (2) and prevents insertion. When the connection plugs (3) and (4) are connected, the locking pin (5) rises to a height that overcomes the locking plate (6), allowing insertion of the drawer-type circuit breaker (1).

A lock lever (11) for locking the connection state with the connection plug (3) is attached to the connection plug (4). After connecting the connection plugs (4) and (5), when the drawer type circuit breaker (1) is further inserted and reaches a position ranging from the test position to the operating position, the lock lever (11
) is constructed so that it cannot be operated in the direction of unlocking because it is obstructed by an operation blocking plate (10) fixed to the fixed part (2). The above configuration will be explained in more detail below with reference to FIGS. 112 and 5-8.

Figures 1 and 7 show the connection plug (
3, 4) A side view showing the structure of the vicinity, Figure 2 is a front view of the vicinity of the connection plug (4) in Figure 1, and Figures 5.6 and 8.
The figure is a view taken along the v-V line in Fig. 4, and shows the connecting plugs (3, 4
) and an operation blocking plate (lO).

In FIG. 1, the lock lever (11) is rotatably attached to the connection plug (4) with a pin (Ilc), and as shown in FIGS.
), and has engagement holes (lids) in the upper and lower parts, respectively. Further, it has a driving plate (llb) only at the lower part. One end of the push-inable cable (7) is attached to a support plate (
lc), and the other end is held directly on the frame (1b). The wire inside the push-nable cable (7) is held in such a way that it can be moved in and out by alternately pushing the exposed ends (7a, ?a'). As shown in Figure 5, the connection plug (3) is fitted into the connection plug (4) and then rotated to lock the pin (3b) in the engagement hole (lid) by rotating the lock lever (11). and locked.

FIG. 6 shows the locked state. In this state,
One end (7a') of the wire is pushed by the drive plate (llb).

In FIG. 1, the link (8) is rotatably mounted around a fulcrum pin (1e) fixed to the frame (lb), and is supported by a compression spring (9) whose one end is fixed to the frame (1b). is biased clockwise. The right end of the link (8) is connected to the locking pin (5) via the pin (8a).
is connected to. The locking pin (5) is attached to the frame (1b)
It passes through a locking pin holding hole (ld) protruding from the lock pin and is movable in a substantially vertical direction.

Connect the connection plug (3) to the connection plug (4) and turn the lock lever (11) in the direction shown by the arrow (A) in Figure 5 to lock the connection plug (3) as shown in Figure 6. Then, one end of the wire (71) of the push-pull cable (7)
) is pushed in, so that the other end (7a) of the wire compresses the link (8) with the compression spring (9), as shown in
Rotate counterclockwise against the

This rotation causes the locking pin (5) to rise and the locking plate (
6), it becomes possible to move the drawer-type circuit breaker (1) toward the operating position.

In addition, as shown in Figure 8, since the operation prevention plate (10) is provided with a length corresponding to the range from the test position to the operating position, the lock lever (11) should be moved clockwise in the figure in this range. It cannot be rotated and therefore the connection plug (
3) - cannot be removed. Also, if you intentionally do not connect the connection plug (3) and the lock lever (11)
If you rotate the locking pin (5) and insert the drawer-type circuit breaker (1) deeper than the test position, even if you try to connect the connecting plug (3) afterwards, the pin (3)
b) hits the lock lever (11), so connection cannot be made.

In addition, in the above embodiment, a structure in which the connection plug (3) cannot be attached or detached in the range from the test position to the operating position is shown, but by changing the position of the operation blocking plate (10), it is possible to switch between the test position and the operating position. Connecting plug (
It is also possible to adopt a structure in which the connection plug (3) cannot be attached or detached, or a structure in which the connection plug (3) cannot be attached or detached only in the operating position. Further, a mechanical link mechanism may be used instead of the push-pull cable (7) as a means of transmitting the driving force.

Further, in the above embodiment, the case of a draw-out type circuit breaker (1) was explained, but it may also be a disconnector or other switch.
The same effects as in the above embodiment are achieved.

[Effects of the Invention] As described above, according to the present invention, the movable locking member ( The locking pin) responds and releases the engagement with the fixed side locking member (lock plate), so the drawer-type circuit breaker cannot be moved to the operating position unless the connection plug is locked. . Furthermore, since the operation blocking plate prevents the unlocking operation of the locking means at a predetermined position, the connection plug cannot be removed in the range from the test position to the operating position, for example. Therefore, there is no possibility that the connection plug is accidentally disconnected from the position where it should be connected, and a safe and highly reliable control circuit locking device can be provided.

[Brief explanation of the drawing]

1st rI! J and 7 are side views showing the configuration near the connection plugs (3, 4) of the draw-out type circuit breaker (1), and FIG.
Figure 3 is a front view of the vicinity of the connection plug (4) in the figure, and Figure 3 shows a drawer-type circuit breaker (1) equipped with a control circuit locking device according to an embodiment of the present invention, and its fixed part (2) on the distribution board side. ) is a front view, Figure 4 is a side view, and Figure 5 is a view from the side.
．． 6 and 8 are views taken along the line V-V in FIG. 4, showing the positional relationship between the connection plugs (3, 4) and the operation blocking plate (lO). In the figure, (1) is a drawer type circuit breaker, (3, 4) is a connection plug, (5) is a lock pin, (6) is a lock plate, (10
) is an operation blocking plate, and (11) is a lock lever. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] (1) In a drawer-type circuit breaker that connects the control circuit to the panel side through a plug connection, the drawer-type circuit breaker is provided with a lock that locks the connection state between the connection plug on the panel side and the connection plug of the steel of the drawer-type circuit breaker. a locking means for locking the circuit breaker; an operation preventing means located at a predetermined position on the panel to prevent the unlocking operation of the locking means; a fixed locking member provided at a predetermined position on the panel; and a movable locking member having an engaging portion that is disengaged/engaged with the fixed locking member in response to the locking/unlocking operation of the locking means. Circuit breaker control circuit locking device.