JP2607495B2 - Draw-out circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a drawer-type circuit breaker that can be moved between a connection position and a disconnection position, and in particular, an operation mechanism of the circuit breaker. The present invention relates to a drawer-type circuit breaker that is disconnected when an interlock mechanism is activated and is kept disconnected except for a manual connection operation.

Operation circuit (Prior Art) In general breaker, the contact Xa immediately relay X when the control power supply is connected as shown in FIG. 4 is energized closed, P _3, the limit switch LS Normally closed contact 3
6, a circuit connecting the contact Xa, the closing spring accumulating motors M10 and N3 is formed, and when the closing spring accumulating motor M10 is energized, the motor M10 rotates and the circuit breaker operating mechanism shown in FIG. The closing spring 11 is configured to be charged. Therefore, as shown in FIG. 6, when the control power supply is alive in the closed switchboard 12, the closing spring 11 is charged immediately when the board-side control circuit disconnecting section 34 is connected to the circuit breaker control circuit disconnecting section 33. The circuit breaker 15 is configured to move from the test position B to the connection position C in the panel while the closing spring 11 is charged.

When the control circuit disconnecting portion is plug-connected, the closing spring 11 is charged as described above when the panel-side control plug 14 is connected to the circuit breaker control circuit disconnecting portion 13 in FIG. There is also a provision that the circuit breaker cannot move to the connection position unless the control plug is connected to the circuit breaker side. In many cases, the circuit breaker moves inside the panel with the closing spring stored.

[Problems to be solved by the invention]

As described above, when the breaker moves while the closing spring is charged, after inserting the breaker 15 at the connection position C as shown in FIG. 6, the breaker operator mistakenly presses the closing button (not shown). When pressed, the closing spring 11 has already been charged, so that the operating mechanism of the circuit breaker rotates the closing cam 16 by the release of the closing spring 11 as shown in FIG. 5 (b)
As shown in the figure, the link 17 operates and the main contact 18 of the circuit breaker is closed and closed. At this time, if the system is in a short circuit state, a short circuit current is supplied, which is very dangerous.

When the circuit breaker 15 is moving, the interlock switch 1L20 is turned off by interlocking with the interlock lever 19 since the interlock lever 19 is lifted as shown in FIG. If the target closing signal is not input to the closing coil 21 shown in FIG. 4 and the interlock lever 19 is also mechanically lifted, the trip catch 22 and the half moon pin 23 do not engage in FIG. Even if the input button is pressed, the operation mechanism is in a trip-free state shown in FIG. However, if the operator presses the input button by mistake during the movement, the input spring 11 is released, but the operating mechanism performs only the input operation, but the trip-free operation shown in FIG. The state may cause unnecessary damage to the operation mechanism and may complicate the operation procedure of the circuit breaker operator.

An object of the present invention is to solve the above-described problems of the prior art, to prevent the accumulation of the closing spring during the movement of the circuit breaker, and to prevent the closing spring from being turned on unless an operator manually turns on after confirming safety. An object of the present invention is to provide a drawer-type circuit breaker in which the energy storage motor does not restart.

[Configuration of the invention]

(Means for Solving the Problems) In order to solve the above-mentioned problems, a drawer-type circuit breaker according to the present invention can be moved in and out between a connection position and a disconnection position. In a drawer-type circuit breaker provided with an interlock mechanism so that a circuit breaker cannot be closed, a switch means is provided in a closing spring accumulating motor circuit for accumulating a closing spring of a circuit breaker operating mechanism. The apparatus is characterized in that it is configured to maintain the disconnected state unless it is disconnected by the operation of the interlock mechanism and manually connected.

(Operation) According to the present invention, the switch means is turned off by the operation of the interlock mechanism during the movement of the circuit breaker to open the closing spring energy accumulating motor circuit by the above means. Even if there is a breaker closing spring, the breaker can be moved without being charged, so that the closing operation is not performed even if the closing button is accidentally pressed during movement, and even after the connection position is inserted, After the safety confirmation, the closing spring can be charged, so that the safety in the operation of the circuit breaker is improved.

(Embodiment) Hereinafter, an embodiment of a draw-out circuit breaker according to the present invention will be described with reference to FIGS. 1 to 3.

1 and 2 are basic structural views of the draw-out circuit breaker according to the present invention. As shown in FIG. 1, an interlock lever 19 is provided above a moving interlock lever 19 of the circuit breaker 15.
A drive pin 26 is provided which is pushed up and moved during operation. The drive pin 26 includes a mounting frame 27 and a drive lever 28
, A drive spring 29 and a return spring 30 are interposed in the middle thereof, and an E-ring 31 for pushing up the drive spring 29 during operation is provided. The drive pin 26 is provided so as to be able to operate in the vertical direction. Here, the spring force of the return spring 30 is set sufficiently smaller than the spring force of the drive spring 29.

When the interlock lever 19 is operated, the drive pin 26 is lifted upward, and the E-ring 31
As a result, the drive spring 29 is pushed upward, and the drive lever 28 is lifted upward. At this time, the toggle switch 24 is attached to the attachment frame 27 such that the arm 35 of the toggle switch 24 is pushed upward by the drive lever 28 and the toggle switch 24 is turned off.

The arm 35 of the toggle switch 24 protrudes from the circuit breaker surface cover 25, and the toggle switch 24 is
It is configured to be able to switch the switches.

Then, in the operation circuit, as shown in FIG. 3, the toggle switch 24 is arranged in front of the normally closed contact 36 of the limit switch LS which turns off upon detection of the completion of the charging of the closing spring between the motor circuits P3-N3. I do. Reference numeral 37 denotes an interlock plate.

Next, the operation of the draw-out circuit breaker according to the present invention configured as described above will be described.

In FIG. 6, when the circuit breaker 15 is moved from the disconnection position A to the connection position C, the interlock lever for movement is used.
It is necessary to lift 19 and disengage with interlock plate 37.

In FIG. 1 and FIG.
When the is lifted, the upper part of the interlock lever 19 comes into contact with the drive pin 26 to push the drive pin 26 upward. As a result, the E-ring 31 provided on the drive pin 26 pushes up the drive spring 29, and the drive lever 28 is pushed upward by the spring force of the drive spring 29. Then, the drive lever 28 pushes up the arm 35 of the toggle switch 24. Immediately after the engagement between the interlock lever 19 and the interlock plate 37 is released, the drive lever 28 is moved to the arm 35 of the toggle switch 24.
Is turned upward, and the toggle switch 24 is turned off.

Thus, in the control circuit, as shown in FIG. 3, when the toggle switch 24 is turned off, the motor circuit P3-N
In the case where the gap between the three is open and the control circuit connection system is the automatic connection system, the circuit breaker 15 moves to the test position B or the connection position C in FIG. Even when connected to the control circuit disconnecting section 34, the closing spring 11 can move without being charged.

Finally, the breaker 15 is inserted into the connection position C, and after the breaker operator confirms the safety, the arm 35 of the toggle switch 24 protruding from the circuit breaker surface cover 25 is manually turned on to ensure safety. You can leave the breaker.

On the other hand, when the control circuit connection method is the control plug method,
Although automatic switching is not performed by the interlock lever 19, in FIG.
By manually inverting the arm 35 of the toggle switch 24 before connecting to the circuit breaker-side plug 13, the motor circuit can be electrically disconnected and the closing spring 11 can be moved without being charged.

〔The invention's effect〕

As described above, according to the present invention, as is apparent from the description of the embodiment, when the control circuit connection system is the automatic connection system, the closing spring accumulating motor circuit is automatically disconnected by the operation of the interlock mechanism. Even if the panel-side control power supply is in a live state, the breaker closing spring can move the circuit breaker without being charged, so that the closing operation can be performed even if the switch is accidentally pressed during movement. In addition, even after the connection position is closed, the closing spring can be manually charged for the first time after confirming the safety, so that the safety in operating the circuit breaker is improved. On the other hand, when the control circuit connection method is a plug method, it is necessary to manually disconnect the motor circuit, but the same effect as described above can be obtained.

[Brief description of the drawings]

1 and 2 are configuration diagrams of a draw-out circuit breaker according to the present invention (FIG. 1 is a front view, FIG. 2 is a side view), and FIG. 3 is a diagram showing an operation circuit of the draw-out circuit breaker. FIG. 4 is a diagram showing an operation circuit of a conventional draw-out type circuit breaker, FIG. 5 is a diagram showing an operation mechanism of the conventional draw-out type circuit breaker, and FIG. 5 (a) is a diagram showing an open circuit state; (B) is a diagram showing a closed state, FIG. 5 (c) is a diagram showing a trip-free state, and FIG. 6 is a combined configuration diagram of a conventional closed switchboard and a circuit breaker. 10 ... Motor for closing spring accumulation, 11 ...
Closed switchboard, 13… Plug circuit breaker control circuit disconnecting part, 14
…… Plug board side control circuit disconnecting part, 15… Circuit breaker, 16…
... closing cam, 17 ... operation link, 18 ... breaker main contact,
19 ... interlock lever, 20 ... interlock switch, 21 ... closing coil, 24 ... toggle switch, 25
… Front cover, 26… Drive pin, 27… Mounting frame, 28… Drive lever, 29… Drive spring, 30… Return spring, 31… E-ring, 32… Split pin, 33… Automatic connection type circuit breaker control circuit disconnecting section, 34 ... Automatic connection type panel side control circuit disconnecting section, 35 ... Toggle switch arm, 36 ... Limit switch, 37 ... Interlock plate.

Claims (2)

(57) [Claims] 1. A drawer-type circuit breaker provided with an interlock mechanism so that the circuit breaker cannot be closed when the circuit breaker is moved in and out. A switch means is provided in a closing spring accumulating motor circuit for accumulating the closing spring, and the switch means is disconnected by the operation of the interlock mechanism and is kept in the disconnected state unless manually connected. A drawer-type circuit breaker characterized by being configured to hold. 2. The drawer-type circuit breaker according to claim 1, wherein said switch means comprises a toggle switch, and said toggle switch lever projects outside the circuit breaker surface cover.