JPH03173305A - Drawer type circuit breaker - Google Patents

Abstract

PURPOSE:To enable throw-in of a circuit breaker only upon connection by providing a sliding board which retracts while being pushed by a male connector to be inserted into a female connector arranged in the rear of an opening, and a shutter which descends when the sliding board retracts. CONSTITUTION:A plug 1B fixed to the box side can be plugged in or out a socket 1A through a rectangular hole 7d and another rectangular hole in a sliding board 3 arranged in the rear. At this time, a padlock can be passed through a hole 7a1 at the upper end of a guide board 7a and a round hole 4a1 at the curved part 4a of a shutter 4 in order to lock the operation of a throw-in button 6 having front face choked by the upper end of the shutter 4. Consequently, mechanical throw-in of a circuit breaker can be blocked. When the padlock is unlocked, the lower end of the shutter 4 descends between a slide board 3 and a face plate 7. At this time, interruption of an auxiliary circuit is disabled by passing the padlock through the hole 7a1 at the lower end of the guide board 7a and the round hole 4a1 at the curved part 4a thus enabling throw-in of the circuit breaker.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION Field of Industrial Application The present invention relates to a draw-out circuit breaker with one mechanical interlock.

(Prior art) For draw-out type circuit breakers, the Japan Electrical Manufacturers Association standard (JEM-14
25-1987) Explanation of Metal Enclosed Switchgears and Control Gears, Section 5,105, Interlock: ■ When the auxiliary circuit is not connected, the draw-out type circuit breaker cannot be inserted from the disconnected position to the operating position.

■ The auxiliary circuit must not be able to disconnect when the draw-out circuit breaker is in the operating position.

It is stipulated that.

Therefore, there is an idea disclosed in Japanese Utility Model Application Publication No. 63-125334. An arrow-shaped lock pin is provided at the rear end of the auxiliary circuit plug, and when the plug is inserted into the socket, the lock lever is used to move between the disconnection position and the operating position provided on the drawer-type circuit breaker. - to unlock.

(Problem to be solved by the invention) However, although this mechanism is easy to operate and satisfies the above interlock conditions (■) and (■), if the operator does not fully insert the plug into the socket, Otherwise, if you push the drawer-type circuit breaker in the disconnection position from the front while it is being inserted, there is a risk that it will move to the operating position.

Therefore, even if the operator makes a mistake, it is conceivable to adopt a method that satisfies the conditions (1) and (2) above.

That would make the interlock mechanism too complicated, so this is the next best condition.

A draw-out circuit breaker cannot be closed mechanically when the auxiliary circuit is unplugged, and can only be closed when the auxiliary circuit is connected.

This interlock may then be satisfied using a padlock.

Sometimes things are required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a draw-out type circuit breaker having an interlock condition that makes it impossible to mechanically close the main circuit when the auxiliary circuit is in the new circuit state, but allows the main circuit to be closed only when the auxiliary circuit is in the connected state.

[Structure of the invention]

(Means and effects for solving the problem) The present invention is housed in a breaker chamber of a closed switchboard so as to be freely drawn out, and the main circuit terminals are connected and disconnected by inserting and removing the breaker chamber from a disconnection position to a connection position. , in a drawer-type circuit breaker with a removable male and female connector for the operating circuit installed in the front opening, it is pushed by the male connector that is inserted into the female connector provided at the rear of the opening. By providing a slide plate that retreats and a shutter above the front end of this slide plate whose upper end shields the front of the manual closing button of the drawer-type circuit breaker and which lowers when the slide plate retreats, the main circuit is closed when the auxiliary circuit is disconnected. This is a draw-out type circuit breaker with an interlock that prevents the circuit from being closed mechanically and can only be closed when the circuit is connected.

(Embodiment) An embodiment of the drawer type circuit breaker of the present invention will be described below with reference to the drawings.

Figure 1 is a front view of the drawer type circuit breaker of the present invention, Figure 2 is a right side view of Figure 1, Figure 3 (a) is a partial detailed view of the lower left side of Figure 1, Figure 3 ( b) is a partial detail view of the lower left side of FIG. 2;

In FIGS. 1 to 3, the rear end of the drawer-type interrupter 8113 equipped with a vacuum breaker (not shown) is provided with movable-side new path portions 13b above and below, and the front surface is U-shaped when viewed from above. A shaped surface plate 7 is provided, a bottom plate 13c is provided at the bottom, and wheels 13a are attached to both sides of the bottom plate 13c at the front and rear ends, respectively.

Further, a rectangular square hole 7d is provided near the lower left end of the surface plate 7, and an elliptical hole 7b is vertically provided above the square hole 7d.
A rectangular square hole 7c is provided on the upper left side of the oval hole 7b.

Further, the surface plate 7 is vertically provided with an L-shaped guide plate 7a with one side protruding forward on the left side of the oval hole 7b, and round holes are provided at the upper and lower ends of the forwardly protruding portion of the guide plate 7a. 7
A□ is provided, and a stopper 10 bent in a substantially Z shape as viewed from the side view of FIGS. 2 and 3(b) is fixed to the upper left of the guide plate 7a at the top of the square hole 7c. There is.

On the other hand, a bolt 8A is installed behind the square hole 7d in the bottom plate 13c.
is installed vertically, and an L-shaped mounting plate 2 is installed on the left side of the surface plate 7 with one side protruding inward immediately after the square hole 7d. When viewed from above, there is a rectangular hole (not shown).

This hole has a socket I with multiple female pins stored inside.
Below A, there is an abbreviated slide plate 3 with an elongated oval hole formed in the front-rear direction from the center of the lower surface to the rear end, and a square hole (not shown) formed in the center of the front surface.
A is provided through the slide plate 3 so as to be movable in the front and back direction, and a coil spring 5 with a large number of turns is attached between the rear end of the slide plate 3 and the bolt 8A, and behind the bolt 8A, the upper side is shaped like the ellipse mentioned above. A bolt 8B fitted into the hole is fixed to the bottom plate 13c.

Further, on the upper part of the slide plate 3, the bent part 4a of the lower end of the shutter 4, which is bent inward, comes into contact with the bent part of the upper end of the slide plate 3 in the state shown in FIG. is mounted close to the inside of the stopper 10, supported by a coil spring 12 whose lower end engages with the center of the upper end and whose upper end is locked to the surface plate 7. The base end of the U-shaped handle 4b has the other end protruding forward from the oval hole 7b, and is attached to cover the front end of the guide plate 7a. A round hole 4 is located at a position that matches the round hole 7a1 at the upper end of the guide plate 7a.
b is provided.

Further, as shown in FIGS. 2 and 3, a closing button 6 for manually closing a vacuum circuit breaker (not shown) is located immediately after the shutter 4 at the back of the square hole 7C.

In the draw-out type circuit breaker configured in this way, the plug 1B is attached to the square hole 7d and the slide plate 3 behind it, as shown in FIGS. 2 and 3(b), which is attached to the box side (not shown). The shutter can be inserted into the socket IA through the square hole not shown in the figure, and can be disconnected from the socket. The input button 6 whose front surface is blocked by the upper end of the input button 4 can be made inoperable. That is, when the plug IB is in a removable state as shown in FIGS. 2 and 3(b), mechanical closing of the drawer type circuit breaker can be prevented.

If the padlock (not shown) is removed, the lower end of the shutter 4 will fall between the slide plate 3 and the front plate 7 as shown in FIGS. 4(a) and 4(b), but at this time, the lower end of the guide plate 7a By locking the hole 7a and the round hole 4b of the bent portion 4b, it is possible to disable disconnection of the auxiliary circuit and to enable the draw-out type circuit breaker to be closed.

〔Effect of the invention〕

As described above, according to the present invention, the circuit breaker is stored in the breaker chamber of the closed switchboard in a freely drawable manner, and the main circuit terminals are connected and disconnected by insertion and removal from the disconnection position of the breaker chamber to the connection position, and the main circuit terminals are operated through the opening on the front side. In a drawer-type circuit breaker equipped with male and female connectors that can be inserted and removed from the circuit, there is a slide plate that is pushed back by the male connector that is inserted into the female connector behind the opening, and The upper end of the drawer-type circuit breaker is equipped with a shutter whose upper end is located in front of the manual closing button of the drawer-type circuit breaker, and which lowers when the slide plate retreats, so that when the auxiliary circuit is disconnected, the main circuit cannot be mechanically closed. It is possible to obtain a draw-out type circuit breaker equipped with an interlock that allows the main circuit to be closed only in certain conditions.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the drawer type circuit breaker of the present invention, Fig. 2 is a right side view of Fig. 1, and Fig. 3 (a) shows the main parts of the drawer type circuit breaker of the present invention. FIG. 3(b) is a right side view of FIG. 3(a), and FIG. 4(8)(b) is a detailed view of main parts showing the operation of the drawer type circuit breaker of the present invention.

Claims (1)

[Claims] The circuit breaker is housed in a breaker chamber of a closed switchboard so that it can be pulled out, and the main circuit terminals are connected and disconnected when the breaker chamber is inserted and removed from the disconnection position to the connection position, and the operating circuit is inserted into the front opening. In a drawer-type circuit breaker equipped with removable male and female connectors, the slide plate is pushed back by the male connector inserted into the female connector provided at the rear of the opening; A drawer-type circuit breaker, characterized in that a shutter is provided above the front end of the plate, the upper end of which closes the manual closing part of the drawer-type circuit breaker, the shutter is movable up and down and is lowered when the slide plate retreats.