JPH11164422A - Interlock equipment for pull-out type circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interlock device for a pull-out type breaker which has high productivity. SOLUTION: In a pull-out type breaker, equipped with an interlock mechanism performing the insertion or pull-out operation of the breaker 1 by releasing the linkage with a notched portion 16a of an interlock base 16 by operating an interlock pin 17, when the breaker 1 is in a disconnected position and its main circuit is open, are provided a switching indication shaft 19 which turns together with a freely movable contact of the main circuit and is supported by a movable base 3 freely rotatably, and a lever 20 which is fixed to a switching indication shaft 19, presses the interlock pin 17 downward against a return spring 21 during the closing of the main circuit and inserts and links an interlock pin 17 to a notched portion 16a of the interlock base 16. Thus, it is not required to change the mounting position of each member, even though a inter-phase distance of the main circuit has been changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlock device for a draw-out circuit breaker.

[0002]

2. Description of the Related Art In general, a draw-out type circuit breaker is composed of a circuit breaker panel, a circuit breaker main body, a primary connection portion of a main circuit, a drawer mechanism, an interlock mechanism, and a secondary connection portion. The primary connection of the main circuit has short-time current resistance and rated current supply performance, but does not generally have short-circuit current or the ability to open and close the rated current. Therefore, the draw-out type circuit breaker needs to be equipped with an interlock device for preventing insertion into the circuit breaker panel or drawing out from the circuit breaker panel while the main circuit is closed. Therefore, drawer-type circuit breakers have
Equipped with an interlock device. 2. Description of the Related Art A conventional drawer-type circuit breaker interlock device is configured as shown in FIGS. In the figure, 1 is a component of a circuit breaker panel, 2 is a circuit breaker main body slidably mounted on a component 1 of the circuit breaker panel via a movable base 3, and 3 a is a component of the movable base 3. The wheels 4 are interlock mechanisms provided beside the circuit breaker main body 2 and are configured to extend over the upper surface of the movable base 3 and the upper surface of the component 1 of the circuit breaker panel. Reference numeral 5 denotes three levers for driving the movable contacts of the main circuit for three phases, which are respectively connected to three shafts 6 protruding from the circuit breaker main body 2. The lever 5 is rotated by a required angle, and as shown in FIG. 2, when the main circuit is closed, the lever 5 rotates to a position shown by a dashed line in FIG. 2, and when the main circuit is opened, it rotates to a position shown by a dotted line. . On the upper surface of the movable base 3, first and second frames 7, 8 of the operation mechanism are vertically installed at intervals. A drive shaft 9 is connected to a drive mechanism (not shown), and both ends are rotatably supported by support members 10a and 10b fixed to the frame 7. The drive shaft 9 integrates an interlock lever 11, a spring hook lever 12, and a pin lever 13 by welding or the like. Reference numeral 14 denotes a sliding pin that passes through the frame 7 and the frame 8 and has one end supported by the pin lever 13. The sliding pin 14 is arranged at a position that coincides with one of the levers 5 when the main circuit of the circuit breaker is closed. 15 hooks one end to the movable base 3 and the other end
And a return spring that constantly applies tension to the interlock lever 11. Reference numeral 16 denotes an interlock base attached to the upper surface of the component 1 of the circuit breaker panel. The interlock base 16 is provided with a notch 16a such as a notch hole at the top. Reference numeral 17 denotes an interlock pin, one end of which is supported by a pin 18 provided on the interlock lever 11 and is hung down. The other end of the interlock pin 17 is inserted into the notch 16a of the interlock base 16 only when the circuit breaker is in the operation position or the test position,
If the breaker is in the process of being inserted or withdrawn,
It slides on the upper surface of the interlock base 16. When the interlock lever 11 is actuated upward, the interlock pin 17 is raised upward via the pin 18 and is lowered by the return force of the return spring 15. When the interlock lever 11 is actuated upward, the slide pin 14 slides in the direction of arrow A, and when the interlock lever 11 is returned to its original position, the return force of the return spring 15 causes the slide pin 14 to move in the direction of arrow B. To return to the original position. The operation of the drawer-type circuit breaker interlock device having such a configuration will be described below. While the main circuit of the circuit breaker is open, the lever 5
Is at the position of the broken line. When the interlock lever 11 is operated upward in this state, the sliding pin 14 slides in the direction of arrow A. The sliding pin 14 does not come into contact with the lever 5 even when slid in the direction of the arrow A, and can move farther beyond the position of the lever 5. Thereby, the interlock pin 17 is lifted up, and the engagement with the notch 16a of the interlock base 16 is released. When a force is applied to pull out the breaker from the breaker board in this state, the interlock pin 17
After slipping out of the notch 16a of the interlock base 16, sliding on the upper surface of the interlock base 16,
The breaker is pulled out of the breaker board. In this state, the circuit breaker that is being pulled out can be inserted into the circuit breaker panel. Conversely, when the main circuit of the circuit breaker is closed, the lever 5 is at the position indicated by the chain line. In this state, even if the interlock lever 11 is to be lifted upward, the tip of the slide pin 14 abuts on the lever 5 and the amount of operation is limited.
Cannot be raised to the top. Therefore, the amount of rise of the interlock pin 17 is limited, and it is not possible to release the interlock pin 17 from the notch 16a of the interlock base 16 to release the engagement between them, and to pull out the breaker from the breaker board. Can not. On the other hand, in this state, the circuit breaker that is being pulled out cannot be inserted into the circuit breaker panel.

[0003]

However, the conventional interlock device of the draw-out circuit breaker has a problem that if the inter-phase distance of the main circuit is changed due to, for example, a customer's request, specifications, or the like.
The position of the lever 5 also changes, and accordingly, it is necessary to change the mounting position of the sliding pin 14 each time, and there is a problem that the product is poor in productivity because it is designed exclusively for each customer's request and specification. . Therefore, an object of the present invention is to provide an interlock device for a draw-out circuit breaker with an interlock structure that is not affected by customer specifications and that has high productivity.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises an interlock base which is attached to a circuit breaker panel and has a partially cutout portion, and an interlock pin which can be inserted and withdrawn. When the circuit breaker mounted on the board via the movable base is in the disconnecting position or the operating position and the main circuit of the circuit breaker is open, the interlock pin is operated to cut out the notch of the interlock base. When the main circuit of the circuit breaker is closed by releasing the engagement with the circuit breaker and the main circuit of the circuit breaker is closed, the interlock pin cannot be operated and the operation of inserting and pulling out the circuit breaker is not possible. In a drawer-type circuit breaker provided with an interlock mechanism that prohibits, an interlock pin slidably supported in a vertical direction by inserting a return spring between the movable base and
An opening / closing display shaft rotatably supported by a movable base and rotating in conjunction with a movable contact of a main circuit; and an open / close display shaft fixed to the opening / closing display shaft, wherein the interlock pin opposes the return spring when the main circuit is closed. And a lever for inserting the interlock pin into the cutout portion of the interlock base. Therefore, even if the inter-phase distance of the main circuit is changed, it is not necessary to change the mounting position of each member, and the productivity is good.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a front view showing an interlock device of a drawer-type circuit breaker according to an embodiment of the present invention, and a part thereof is shown in a cross section. 2 and 3 denote the same or corresponding members, and a description thereof will not be repeated. FIG.
In the figure, 19 is an open / close display shaft which rotates in conjunction with a movable contact of the main circuit, 20 is a lever fixed to the open / close display shaft 19, and stops at a position indicated by a dashed line when the main circuit is opened. When the circuit is closed, the vehicle stops at the position indicated by the solid line. The interlock pin 17 is provided between the movable base 3 and the return spring 21.
And is slidably supported in the up-down direction. Further, the interlock pin 17 is subjected to a force for always moving upward by the return spring 21 until the lever 20 comes to a position when the main circuit is opened or close to a position when the main circuit is opened. It is in contact with the lever 20. Reference numeral 22 denotes a bolt screwed into the tip of the interlock pin 17 for adjusting the gap with the lever 20 when the main circuit is closed.
7 is provided for adjusting the operation amount. Next,
An interlock device having such a configuration will be described. When the main circuit is closed, the lever 20 is at the position indicated by the solid line, and the interlock pin 17 is positioned below with the head being pressed by the lever 20. Therefore, the interlock pin 17 is not disengaged while being inserted into the cutout 16a of the interlock base 16, so that the breaker cannot be inserted into the breaker board or pulled out from the breaker board. When the main circuit is open, the lever 20 is at the position shown by the dashed line, and the interlock pin 17 is closed.
Is released from the pressing of the head by the lever 20 and is lifted upward. Therefore, the interlock pin 17
Is released from the notch 16a of the interlock base 16 and disengaged, so that the breaker can be inserted into the breaker board or pulled out from the breaker board. In addition, even if a change occurs in the phase distance of the main circuit due to customer specifications, the change in the phase distance can be absorbed within the range of the length of the lever 20.
There is no need to replace special parts.

[0006]

As described above, the present invention has the following effects. (1) Productivity can be greatly improved by adopting an interlock structure that is not affected by customer specifications. (2) Dedicated parts according to customer specifications are not required, interlock parts can be shared, and a simple structure and a small number of parts can greatly reduce costs.

[Brief description of the drawings]

FIG. 1 is a front view showing an interlock device of a drawer-type circuit breaker according to an embodiment of the present invention, a part of which is shown in cross section.

FIG. 2 is a front view showing a conventional drawer-type circuit breaker interlock device.

FIG. 3 is a side view showing a conventional drawer-type circuit breaker interlock device, a part of which is shown in cross section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Component member of circuit breaker board, 2 Circuit breaker main body, 3 Movable base, 3a wheel, 4 Interlock mechanism, 5 Lever, 6 axis, 7 First frame, 8 Second frame, 9 Drive shaft 10a Support member, 10b support member, 11 interlock lever, 12 spring latch lever, 13 pin lever, 14 sliding pin, 15 return spring, 16 interlock base, 16a notch, 17 interlock pin, 18 pin, 19 opening / closing display axis, 20 lever , 21 return spring, 22 bolt

Claims (1)

[Claims] An interlock base having a notch in a part thereof, and an interlock pin which can be inserted and removed, are mounted on the circuit breaker board, and a circuit breaker mounted on the circuit breaker board via a movable base is provided. When the main circuit of the circuit breaker is open in the disconnection position or the operation position, the interlock pin is operated to release the engagement with the notch of the interlock base, and the circuit breaker is inserted or pulled out. Performing the operation, when the main circuit of the circuit breaker is closed, the drawer-type circuit breaker provided with an interlock mechanism that cannot operate the interlock pin and prohibits the insertion or withdrawal operation of the circuit breaker, An interlock pin slidably supported in a vertical direction by inserting a return spring between the movable base and the movable base; and an interlock pin rotatably supported by the movable base and rotating in conjunction with a movable contact of the main circuit. A closed display shaft, fixed to the open / close display shaft, pushing down the interlock pin against the return spring when the main circuit is closed, and inserting the interlock pin into the notch of the interlock base. An interlock device for a draw-out circuit breaker, comprising: