KR20010053794A - device for auto-tuip and closing in MCCB - Google Patents

Abstract

PURPOSE: An apparatus for automatic trip and input prevention in lead-in/out of a vacuum breaker is provided to be capable of enhancing the reliability in the operation of the breaker as well as presenting the stability and conveniency to a user by installing another lift lever controlling an input latch and a trip latch. CONSTITUTION: The apparatus comprises an input latch(10), a trip latch(11), a lift lever(12), a stop rod(12) and a positioning plate(15). The lift lever(12) is installed within the breaker, and restrains the input directional rotation of the input latch(10) as well as rotates the trip latch(11) in a trip direction while being vertically lifted in lead-in/out of the breaker. The stop rod(12) is fixed to the bottom end of the lift lever(12). The positioning plate(15) is fixed to a cradle and is connected to the bottom surface of the stop rod(12) to lift the lift lever in lead-in/out of the breaker.

Description

Device for automatic trip and closing of vacuum breaker in and out {device for auto-tuip and closing in MCCB}

The present invention relates to a vacuum circuit breaker, which is an industrial device installed and used on transmission and distribution lines, and more particularly, to automatically trip the circuit breaker when the circuit breaker is pulled in or pulled out. This prevents the risk of accidents caused by high-pressure arcs.

In general, the vacuum circuit breaker is built in the switchboard and has the ability to cut off the fault current on the line and energize the rated current. Separating circuit and equipment protection equipment.

In addition, the breaker has a fixed type and a cradle (Cradle), which is directly connected by the fasteners of the breaker and the switchboard of the switchboard by means of a fastening tool, and artificially draws the inside of the switchboard into the state of the circuit breaker. It is divided into a draw-out type which is a structure that can be fastened or separated as necessary in the power distribution unit in the switchboard.

1 and 2 are a perspective view and a partially enlarged view showing a pull-out type vacuum circuit breaker, wherein the circuit breaker 1 is installed to support movement in the cradle 3 while being mounted on the support mechanism 2. When the handle (not shown) is coupled to the mechanism part 2 and rotated, the breaker 1 is guided to the breaker guide (not shown) installed in the cradle 3 according to the rotation direction thereof, and the operation position and test The location will be moved back and forth.

In addition, the circuit breaker 1 is provided with an opening and closing shaft 5 and the rotating plate 6 for transmitting the energy accumulated by the external force to the contact of the main circuit portion 4 of Figure 1 through the up and down rotational movement, At a position close to the shaft, a lifting plate 7 is provided which moves up and down in accordance with the rotation of the rotating plate 6.

Therefore, when the breaker is inserted, the opening / closing shaft 5 and the rotating plate 6 rotate counterclockwise in the drawing, while the rotating plate 6 is connected to the upper end of the lifting plate 7 to press the lifting plate 7 to lift. The steel plate 7 moves downward, and at this time, the engaging rod 8 portion formed integrally with the elevating plate 7 is inserted into the engaging hole 9 formed at the operation position and the test position of the circuit breaker, respectively, to draw in and out of the circuit breaker. Will be prevented.

That is, when the breaker is put in the operation position or the test position, the catching rod 8 is inserted into the catching hole 9 to stop the movement of the breaker, and when the breaker trips, the catching rod 8 comes out of the catching hole 9 and moves. If the breaker and the contact portion of the cradle is separated from each other while high current flows while the breaker is turned on, there is a risk of causing a serious problem due to the generation of high pressure arc.

However, the conventional apparatus as described above can perform a safety function satisfactorily during the energization by preventing the draw-out with the breaker is closed, but when the draw-out mechanism is aging or the locking hole 9 is deformed by external force There is a high possibility of malfunction or non-operation and there is no secondary protection against such malfunction or non-operation.

In addition, there is also a problem that the breaker torsion occurs because the locking device is inherently a risk of damage to the mechanism and because the position of the locking hole is eccentric in the center.

An object of the present invention is to install another lifting lever for controlling the trip lever and the input lever in addition to the existing lifting plate to improve the reliability of the breaker operation and to automatically provide the user with stability and convenience when the vacuum breaker is pulled in and out It is to provide a trip and input prevention device.

In accordance with an embodiment of the present invention for achieving the above object, the closing lever and trip lever installed in the breaker, the breaker is installed in the breaker while restraining the rotation of the closing lever in the input direction while vertically rising during the inlet and out of the breaker Of the vacuum breaker comprising: a lifting lever for rotating in a tripping direction; a locking rod fixed to a lower end of the lifting lever; and a positioning plate fixed to a cradle and connected to a bottom surface of the locking rod to raise and lower the lifting lever when the breaker is pulled out. Automatic trip and closing prevention device is provided at the time of withdrawal.

1 is a perspective view showing a conventional device

2 is an enlarged view of a part of FIG. 1;

Figure 3 is a perspective view of the device of the present invention

4 is an enlarged view of a part of FIG. 3;

5 is a partial front view of FIG. 3

Figure 6 is a perspective view of an automatic trip mechanism applied to the present invention

Explanation of symbols for main parts of the drawings

10: closing latch 11: trip latch

12; Lift lever 12a: anti-rotation jaw

12b: lever connection portion 13: hook rod

15: positioning plate 16, 17: engaging hole

18: turning

3 is a perspective view of the apparatus of the present invention, and FIGS. 4 and 5 are partially enlarged and front views of FIG. 3.

The circuit breaker 1 is installed to move in the cradle 3 while being mounted on the support mechanism 2, and the opening and closing shaft 5 and the rotating plate which transfer the accumulated energy to the contacts of the main circuit part 4 in the circuit breaker. (6) is provided.

One side of the opening and closing shaft (5) is provided with a lifting plate (7) for up and down reciprocating movement in accordance with the rotational movement of the rotating plate (6), the locking rod (8) integrally formed at the bottom of the lifting plate (7) Is fitted into the catching hole 9 or exits the catching hole 9 in accordance with the lifting of the elevating plate 7.

In the breaker 1, the closing latch 10 and the trip latch 11 are installed at the upper and lower sides, and one side of the breaker 1 moves up and down while rotating the closing latch 10 and the trip latch 11. Lifting lever 12 for controlling the is provided.

The lifting lever 12 is provided with a rotation preventing jaw portion 12a which prevents rotation in the input direction of the closing latch 10 when the lever is raised and a latch connection part 12b which rotates the trip latch 11 when the lever is raised. The lower end is provided with a locking rod (12).

The locking rod 13 is coupled to the lifting lever 12 by screwing, and the nut 13 is coupled to the screw portion to finely adjust the length from the lower end of the lifting lever 12 to the lower end of the locking rod 13. In addition, the catching rod 13 is provided with a spring 14 for restoring the catching rod 13 to its original position.

Positioning plate 15 is fixed to the bottom surface of the cradle (3), the locking plate (16) (to the positioning plate 15 so that the locking rod 13 can be inserted in the operation position and test position of the breaker) 17) is formed.

In the present invention as described above, when the breaker is put in the operating position or the test position, the engaging rod 8 at the bottom of the elevating plate 7 is coupled to the engaging hole 9 and at the same time is fixed to the lower end of the elevating lever 12. The locking bar 13 is coupled to one of the locking holes of the locking holes 16 and 17 formed in the positioning plate 15.

When the breaker 1 is drawn in or withdrawn in the above state, the catching rod 13 moves upward while moving away from the catching hole formed in the positioning plate 15, and the lifting lever is moved according to the movement of the catching rod 13. (12) also moves upwards, and when the lifting lever 12 moves upward, the trip latch 11 connected to the latch connection portion 12b rotates clockwise in the drawing of FIG.

Accordingly, the contact pressing force of the main circuit 4 which is energized by the rotational force of the trip latch 11 is lost, and at the same time, the projection 18 formed on the closing latch 10 is raised and lowered as shown by the dotted line in FIG. 5. It is connected to the rotation prevention jaw portion (12a) formed in the) and the rotational force in the closing direction is constrained so that the breaker is not introduced in the middle of the breaker draw-out.

As described above, the device of the present invention is configured to lift the lift lever vertically when the breaker is pulled in and remove the trip latch and to prevent rotation of the feed latch in the closing direction. Even when attempting to draw in and out of the circuit breaker, the breaker trips before the breaker's current section leaves the current section of the switchboard, thereby protecting the driver from danger due to high voltage and high current.

Claims (3)

An input lever and a trip lever installed in the breaker, a lifting lever installed in the breaker to restrain the rotation of the input lever in the input direction while vertically rising when the breaker is pulled in and out, and to rotate the trip lever in the trip direction; and a lower end of the lifting lever. And a locking bar fixed to the cradle and a position plate fixed to the cradle and connected to a bottom surface of the locking bar to raise and lower the lifting lever when the breaker is pulled in and out of the vacuum breaker. The device of claim 1, wherein the lifting lever comprises a rotation preventing jaw that connects with the projection of the feeding lever to restrict rotation and a latch connection that connects with the trip lever to rotate. The apparatus of claim 1, wherein the locking bar is coupled to the lever by screwing, and the screw of the locking bar is engaged with a nut for adjusting the length of the locking bar.