JPH10229613A - Interlock device of breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the tripped state of a breaker in motion for an automatic operation by electrical interlock and mechanical interlock, avoid faults such as sparking caused by a misoperation during the motion of the breaker and improve safety. SOLUTION: A push-up rod 56 which is provided so as to be able to move vertically and turns a linking lever 41, which trips a breaker 4 clockwise by its upward motion, a roller 59 provided on the lower end of the push-up rod 56 and a tripping plate 53 which is placed in parallel with the long hole 7 of an interlock plate 6 on the side of the long hole 7, has inclined planes 54 on both its end parts and is brought into contact with the roller 59 between the contact hole 8 and breaking hole 9 of the long hole 7 for moving the push-up rod 56 upwards are provided.

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 circuit breaker which prevents an accident caused by erroneous operation of a circuit breaker inserted in a cubicle.

[0002]

2. Description of the Related Art A conventional circuit breaker interlock device of this type has a circuit breaker fixed to a connection position. FIG. 3A is a partially cutaway front view, FIG. 3C in the right side view of a cut-away view of the moving of the circuit breaker from the connection position to the disconnection position, D in the right side view of the moving state of the circuit breaker, and FIG. 4 in a partially cut-away plan view of FIG. 3A. .

In these figures, 1 is a cubicle,
Reference numeral 2 denotes a bottom plate of the cubicle 1; 3 denotes a charged portion formed of a fixed conductor in the cubicle 1; 4 denotes a drawer-type circuit breaker that moves on the bottom plate 2; , Is connected to the charging unit 3 at the connection position S, and is disconnected from the charging unit 3 at the disconnection position T.

[0004] Reference numeral 6 denotes an interlock plate installed in the front-rear direction above the front portion of the bottom plate 2. Reference numeral 7 denotes a long hole formed in the interlock plate 6 in the front-rear direction. Connection hole 8 at position S and disconnection hole 9 at disconnection position T at the front end
And are communicated. Reference numeral 10 denotes a guide plate having an L-shaped cross section disposed in the front and rear portions below the interlock plate 6 in the left-right direction. Reference numeral 11 denotes a shutter provided movably to the left and right using the guide plates 10 as guides. 11 is a spring, which is implanted at the front and rear portions on the right side of the lower surface of the lower surface 11. One end is locked to the implantation rod 12, and the other end is a fixing plate 14.
, And urges the shutter 11 rightward.

Reference numeral 15 denotes a support rod planted in the center of the left side of the lower surface of the shutter 11, and reference numeral 16 denotes a flat U-shaped opening formed in the shutter 11.
The insertion hole 18 is formed to the left from the rear end and the front end of the moving hole 17. The moving hole 17 corresponds to the size of the elongated hole 7, and both the inserted holes 18 are connected to the connecting hole 8 of the elongated hole 7. And the size of the disconnecting hole 9. Reference numeral 19 denotes a closing portion formed between the two insertion holes 18 of the shutter 11.

Reference numeral 20 denotes a coil installed at the rear of the bottom plate 2,
Reference numeral 21 denotes a plunger for the coil 20, which moves rightward when the coil 20 is energized. Reference numeral 22 denotes a lever in the front-rear direction, the center of which is rotatably supported, the rear end of which is connected to the plunger 21, and the front end of which is connected to the support rod 15, respectively.
The movement of the plunger 21 causes the lever 22 and the support rod 15 to move.
, The shutter 11 is guided by the two guide plates 10 and moves left and right to open and close the long hole 7. 23 is a lever 22
Are guides provided at the front and rear of the vehicle.

Reference numeral 24 denotes a support mounted in the circuit breaker 4, which is bent rightward from the upper end of the vertical plate 25 to form an upper plate 26, and bent downward from the front end of the upper plate 26. And the front plate 27
Is formed, and a lower plate 28 is formed by bending backward from the lower end of the front plate 27.

Reference numeral 29 denotes an interlock pin, which is vertically movable through the lower plate 28 of the support 24 and the bottom plate of the circuit breaker 4. Is inserted into. Reference numeral 30 denotes a locking lever implanted on the front of the upper part of the interlock pin 29, reference numeral 31 denotes a brim-shaped locking plate mounted below the interlock pin 29, and reference numeral 32 denotes a connection between the lower plate 28 and the locking plate 31. A spring provided therebetween urges the interlock pin 29 downward. Reference numeral 33 denotes a hook-shaped guide hole formed on the lower right side of the front plate 27 of the support 24, and the lock lever 30 extends from the guide hole 33. Reference numeral 34 denotes a lock position at the lower end of the guide hole 33, and reference numeral 35 denotes an unlock position at the right end of the guide hole 33.

Reference numeral 36 denotes a release lever, which is
Through the upper left side of the front plate 27, and is provided to be able to move back and forth. 37 is a gripping piece formed by bending leftward at the front end of the tripping lever 36; 38 is a pin planted on the right side of the center of the tripping lever 36; 39 is a vertical plate 25 of the support 24; Is a rotary lever whose base is fixed to the rotary shaft 39, 41 is a dog-shaped connecting lever whose central portion is fixed to the rotary shaft 39, and one end is a release lever. 36 is connected to the rear end.

Reference numeral 42 denotes a trip coil mounted on the upper plate 26 of the support 24, and reference numeral 43 denotes a plunger which is provided so as to be movable up and down and moves upward when the trip coil 42 is energized.
The lower end is connected to the other end of the connection lever 41. 44
Is a spring whose both ends are engaged with the lower plate 28 of the support 24 and the connecting lever 41, urges the connecting lever 41 in the clockwise direction, that is, in the reverse direction, and moves the release lever 36 backward and the plunger 43. Is located below.

Reference numeral 45 denotes an unlocking lever whose center is rotatably supported, and one end of which is located above the tip of the rotating lever 40. 46 is a lock pin that rotates integrally with the unlock lever 43, 47 is a link, 48 is a half-moon-shaped notch formed in the lock pin 46, 49 is a hook whose center is rotatably supported by a support shaft 50. The upper end portion is formed in an arc shape, and the right side contacts and locks the lock pin 46.
51 is a main shaft lever fixed to the main shaft of the circuit breaker 4;
The distal end is connected to the lower end of the hook 50.

Next, a manual operation for moving and fixing the circuit breaker 4 will be described. 3A, 3B and 4 show a state in which the circuit breaker 4 is fixed at the connection position S, and the primary disconnecting section 5 of the circuit breaker 4 is connected to the charging section 3 of the cubicle 1,
A closing portion 19 of the shutter 11 closes an intermediate portion between the connection hole 8 of the long hole 7 of the interlock plate 6 and the disconnection hole 9, and the connection hole 8 is closed.
The lower end of the interlock pin 29 in the down state is inserted into the lock position 3 of the guide hole 33 of the front plate 27 of the support 24.
4, the locking lever 30 of the interlock pin 29 is located.
The pin 38 of No. 6 abuts, the upward movement of the interlock pin 29 is prevented, the circuit breaker 4 is operable, and the circuit breaker 4 cannot be pulled out regardless of whether the circuit breaker 4 is energized or not. .

When the circuit breaker 4 is moved from the state shown in the figure to the disconnection position T, when the release lever 36 is manually pulled out forward, as shown in FIG. 3C, the connection lever 41 and the rotation lever 40 are rotated counterclockwise. That is, the plunger 43 of the release coil 42 moves forward, the one end of the unlocking lever 45 is pushed up by the tip of the rotating lever 40, and the unlocking lever 45 and the lock pin 46 rotate, and the hook 49 The notch 48 of the lock pin 46 is located at the upper end of the lock pin, the engagement is released, the hook 49 rotates, and the main shaft lever 51 rotates,
The circuit breaker 4 is tripped to be in a tripped state.

That is, the breaker 4 in the closed state is shut off, and the closing operation of the circuit breaker 4 in the closed state is prevented.

Further, the forward movement of the trip lever 36 also moves the pin 38 of the trip lever 36 forward, and the engagement between the pin 38 and the interlock pin 29 is released.

Next, with the release lever 36 pulled out, the locking lever 30 of the interlock pin 29 is raised, and the locking lever 30 is moved to the locking position 34 of the guide hole 33.
When the interlock pin 29 is moved to the unlocking position 35 and locked, the interlock pin 29 moves upward and separates from the connection hole 8. And
The interlock pin 29 is held at the position moved upward by the compressed spring 32, and at the same time, the interlock pin 2
9 is located behind the pin 38 of the trip lever 36, and the trip lever 36 is held at a position where the trip state is maintained.

Then, the circuit breaker 4 is moved forward, and FIG.
As shown in (1), the primary disconnecting section 5 of the circuit breaker 4 is separated from the charging section 3, and the circuit breaker 4 is moved to the disconnecting position T.

Next, when the circuit breaker 4 is fixed at the disconnection position T, when the lock lever 30 is moved from the unlock position 35 of the guide hole 33 to the lock position 34, the interlock pin 29 is lowered by the spring 32. , The lower end of the interlock pin 29 is inserted into the disconnecting hole 9 of the elongated hole 7, the connecting lever 41 is reversely rotated by the spring 44, the trip lever 36 moves rearward, and the plunger 43 moves downward. When the pin 38 of the release lever 36 is moved to the upper surface of the interlock pin 29,
9 is stopped, and the circuit breaker 4 is fixed at the disconnection position T.

Next, the automatic operation of moving and fixing the circuit breaker 4 will be described. When the circuit breaker 4 is moved from the state shown in FIGS. 3A, 3B and 4 to the disconnection position T, when the coil 20 is excited by the automatic movement command of the circuit breaker 4, the plunger 2 is turned off.
1 moves to the right, the shutter 11 moves to the left, ie, the opening direction, against the spring 13 via the lever 22, and the opening 1
6 are located below the long holes 7 of the interlock plate 6, and the long holes 7 are opened.

On the other hand, the trip coil 42
Is excited, the plunger 43 is attracted and moves upward, the connection lever 41 and the rotation lever 40 rotate forward, the release lever 36 moves forward, and the unlocking lever 45 is moved by the tip of the rotation lever 40. Rotates, and the circuit breaker 4 is in a tripped state as in the case of the manual operation,
With the interlock pin 29 moved down, the circuit breaker 4 is moved forward by a moving means such as a motor (not shown), and is controlled by a cam and a limit switch (not shown) provided at the bottom of the circuit breaker 4. The circuit breaker 4 stops at the disconnection position T. At this time, the interlock pin 29 is located in the disconnect hole 9 of the long hole 7.

When the circuit breaker 4 stops, the coil 2
0 is stopped, the plunger 21 is sucked and moves leftward, and the closing portion 19 of the shutter 11 moves below the intermediate portion between the connection hole 8 and the disconnection hole 9 via the lever 22. , The middle part is closed.

At the same time, the energization of the tripping coil 42 is stopped, the plunger 43 moves downward, the connecting lever 41 rotates in the reverse direction, and the tripping lever 36 moves rearward. The pin 38 comes into contact with the upper surface of the interlock pin 29, and the upward movement of the interlock pin 29 is prevented, so that the circuit breaker 4 is fixed at the disconnection position T.

The manual and automatic movement of the circuit breaker 4 from the disconnection position T to the connection position S and the fixing operation at the connection position S are substantially the same as the above-mentioned operations.

[0024]

In the above-mentioned conventional apparatus, when the circuit breaker 4 is manually moved, the trip lever 3 is required.
The tripping state of the circuit breaker 4 due to the forward movement of 6 is secured by the mechanical interlock by the upward movement of the interlock pin 29. However, when the circuit breaker 4 is automatically moved, the tripping state of the circuit breaker 4 is maintained. Is secured only by the electrical interlock by energizing the trip coil 42, and the mechanical interlock is not secured by the interlock pin 29.

For this reason, there is a problem that, when the energization to the trip coil 42 is stopped during the movement of the circuit breaker 4 due to an accident such as a short circuit or a failure, a manual closing operation can be performed.

Further, if the closing operation is performed when the distance l between the primary disconnecting section 5 of the circuit breaker 4 and the charging section 3 of the cubicle 1 is small as shown in FIG. 3D, there is a risk of discharge. There is a problem.

In the present invention, the above-mentioned point is taken into consideration, and the tripping state during the movement of the circuit breaker by the automatic operation is secured by the electric interlock and the mechanical interlock, and the discharge due to the erroneous operation during the movement of the circuit breaker. It is an object of the present invention to provide an interlock device for a circuit breaker which can prevent accidents such as the above and improve safety.

[0028]

In order to solve the above-mentioned problems, an interlock device for a circuit breaker according to the present invention comprises an interlock plate provided in a cubicle, and an interlock plate formed on the interlock plate. A long hole in which a connection hole at the connection position of the circuit breaker and a disconnect hole at the other end of the circuit breaker at the disconnect position are provided movably below the interlock plate; A shutter that closes an intermediate portion between the connection hole and the disconnecting hole and is opened by an automatic movement command of the circuit breaker; an interlock pin that is provided to be vertically movable and that is inserted into the elongated hole in a downward moving state; A trip lever provided to be able to move back and forth, and a
A plunger that moves upward by energization of the trip coil, one end is connected to the trip lever, and the other end is connected to the plunger, and rotates forward by the forward movement of the trip lever or the upward movement of the plunger, and shuts off An interlock device for a circuit breaker having a connecting lever for releasing a circuit breaker and a spring for urging the connecting lever in a reverse rotation direction is provided so as to be vertically movable, and the connecting lever is moved upward by the upward movement. A push-up rod for forward rotation, a roller provided at the lower end of the push-up rod, and a side-by-side parallel to the long hole in parallel with the long hole; A trip plate is provided between the disconnecting hole and the roller to make contact with the roller and move the push-up bar upward.

Therefore, between the connection hole of the long hole of the interlock plate and the disconnection hole, the push-up rod is moved upward by the release plate via the roller, and the connection lever for turning off the circuit breaker is rotated. Thus, during the movement of the circuit breaker by the automatic operation, in addition to the electric interlock by energizing the trip coil, the mechanical interlock by the upward movement of the push-up bar can be secured.

Then, by securing this mechanical interlock, the tripped state of the circuit breaker can be maintained,
It is possible to prevent an accident such as discharge due to a closing operation during the movement of the circuit breaker, thereby improving safety.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to one embodiment, FIG. 1A is a partially cutaway front view showing a state where a circuit breaker is fixed at a connection position.
A description will be given with reference to FIG. 1B of the cut right side view of FIG. 1A, FIG. 2C of the cut right side view while the circuit breaker is moving from the connection position to the disconnection position, and FIG. In these figures, the same reference numerals as those in FIGS. 3 and 4 denote the same or corresponding elements, and the differences are as follows.

Reference numeral 52 denotes a moving hole in the front-rear direction formed parallel to the right side of the long hole 7 of the interlock plate 6, and 53 denotes a moving hole 5
2, a front and rear trip plate provided at the lower part of the trip plate 53, and inclined surfaces formed at the front end and the rear end of the trip plate 53.
Reference numeral 5 denotes a horizontal tripping surface of the tripping plate 53 formed between the two inclined surfaces 54.

Reference numeral 56 denotes an inverted L-shaped push-up rod formed by bending the upper end part to the left. The tip part is located on the lower surface of the plunger 43 of the trip coil 42, and the lower end part is a draw-out type shut-off. It penetrates the bottom plate of the container 4, is inserted into the moving hole 52, and is provided on the right rear side of the interlock pin 29 so as to be vertically movable. Numeral 57 denotes a U-shaped guide plate fixed to the bottom plate of the circuit breaker 4, and a push-up bar 56 penetrates the upper and lower pieces, and guides the vertical movement of the push-up bar 56 to prevent runout. .

Reference numeral 58 denotes a brim-like stopper provided on the push-up bar 56, which prevents the push-up bar 56 from deviating from the guide plate 57 and regulates a moving range of the push-up bar 56. Reference numeral 59 denotes a roller provided at the lower end of the push-up rod 56, which comes into contact with the tripping plate 53, and rotates the tripping plate 53 by the movement of the circuit breaker 4.

Next, the operation will be described. Circuit breaker 4
3 is substantially the same as that in FIGS. 3 and 4 and will not be described.

Next, the automatic operation of moving and fixing the circuit breaker 4 will be described. 1A, 1B and 2 show a state in which the circuit breaker 4 is fixed at the connection position S, the primary disconnecting section 5 of the circuit breaker 4 is connected to the charging section 3 of the cubicle 1, and the shutter 11 is closed. The portion 19 closes an intermediate portion between the connection hole 8 and the disconnection hole 9 of the long hole 7 of the interlock plate 6, and the lower end of the interlock pin 29 in the downward movement state is inserted into the connection hole 8, and The roller 59 is the release plate 53
Abuts on the inclined surface 54 at the rear end.

When the circuit breaker 4 is moved from the illustrated state to the disconnection position T, the automatic movement command of the circuit breaker 4
The coil 20 is excited, the shutter 11 moves to the left via the plunger 21 and the lever 22, and the slot 7 of the interlock plate 6 is opened. On the other hand, the trip coil 42 is excited by the command, the plunger 43 moves upward, the connecting lever 41 and the rotating lever 40 rotate forward, and the circuit breaker 4 is in the trip state as in the case of FIG.

Next, moving means such as a motor (not shown)
When the circuit breaker 4 is moved forward in a state where the interlock pin 29 is moved downward, the push-up bar 56 moves upward on the tripping plate 53 via the roller 59 and moves, and the plunger is moved by the upwardly-moved push-up bar 56. The connection lever 41 is held in a state of normal rotation via 43. That is, the tripped state of the circuit breaker 4 is maintained by the mechanical interlock.

When the breaker 4 is stopped at the disconnecting position T by a cam and a limit switch (not shown) provided at the bottom of the circuit breaker 4, the interlock pin 29 is positioned at the disconnecting hole 9 of the elongated hole 7. At the same time, the power supply to the coil 20 is stopped, and the movement of the plunger 21 causes the shutter 11 to move.
Closes an intermediate portion between the connection hole 8 and the disconnection hole 9.

At the same time, the energization of the trip coil 42 is stopped, the plunger 43 moves downward, the push-up rod 56 moves downward from the trip plate 53, and the connecting lever 41 rotates in the reverse direction to cause the trip. The lever 36 moves backward, the upward movement of the interlock pin 29 is prevented by the pin 38 of the release lever 36, and the circuit breaker 4 is fixed at the disconnection position T.

As described above, during the movement of the circuit breaker 4, in addition to the electrical interlock by energizing the trip coil 42 and the mechanical interlock by the upward movement of the push-up rod 56, the trip coil 42 The tripped state of the circuit breaker 4 can be maintained regardless of whether the circuit breaker 4 is energized or not, and accidents such as discharge due to erroneous operation during the movement of the circuit breaker 4 can be prevented.

The automatic operation of moving the circuit breaker 4 from the disconnection position T to the connection position S and fixing the circuit breaker 4 at the connection position S is substantially the same as the above operation.

[0043]

Since the present invention is configured as described above, it has the following effects. In the interlock device of the circuit breaker of the present invention, between the connection hole 8 of the long hole 7 of the interlock plate 6 and the disconnection hole 9, the push-up rod 56 is moved upward by the tripping plate 53 via the roller 59, Since the connecting lever 41 for turning off the circuit breaker 4 is rotated, during the movement of the circuit breaker 4 by the automatic operation, in addition to the electric interlock by energizing the trip coil 42, the upward movement of the push-up rod 56 is performed. Mechanical interlock can be secured.

By securing this mechanical interlock, the tripped state of the circuit breaker 4 can be maintained, and accidents such as discharge due to the closing operation during the movement of the circuit breaker 4 can be prevented, and safety can be secured. Performance can be improved.

[Brief description of the drawings]

FIG. 1A is a partially cutaway front view of a state in which a circuit breaker according to one embodiment of the present invention is fixed at a connection position, FIG. 1B is a cut right side view of A, and FIG. It is a cut right side view in the middle of moving to a position.

FIG. 2 is a partial plan view of FIG. 1A.

3A is a partially cutaway front view of a state in which a conventional circuit breaker is fixed at a connection position, FIG. 3B is a cut right side view of A, and C is in the process of moving the circuit breaker from the connection position to the disconnection position. And FIG. D is a right side view of the circuit breaker in a moving state.

FIG. 4 is a partially cutaway plan view of FIG. 3A.

[Explanation of symbols]

 Reference Signs List 1 cubicle 4 circuit breaker 6 interlock plate 7 long hole 8 connection hole 9 disconnection hole 11 shutter 29 interlock pin 36 release lever 41 connection lever 42 release coil 43 plunger 44 spring 53 release plate 54 inclined surface 56 push-up rod 59 roller

Claims (1)

[Claims] 1. An interlock plate provided in a cubicle, a connection hole formed on the interlock plate and having a breaker connection position at one end and a breakage hole at a breakage position of the breaker at the other end. And a movable hole provided below the interlock plate. The intermediate portion between the connection hole and the disconnecting hole of the long hole is closed. A shutter that opens, an interlock pin that is vertically movable and is inserted into the elongated hole in a downward movement state, a release lever that is freely movable back and forth, and a release coil that is vertically movable and that is provided with a release coil. A plunger that moves upward by energization; one end is connected to the trip lever, and the other end is connected to the plunger; the plunger rotates forward by the forward movement of the trip lever or the upward movement of the plunger to pull the circuit breaker; An interlock device for a circuit breaker comprising a connection lever for releasing the connection lever and a spring for urging the connection lever in a reverse direction. The interlock device is provided to be vertically movable, and the connection lever is normally rotated by upward movement. A push-up rod to be driven; a roller provided at a lower end of the push-up rod; and a side-by-side side of the long hole, arranged in parallel with the long hole, inclined surfaces formed at both ends, and the connection hole and the disconnection. An interlocking device for a circuit breaker, comprising: a release plate for moving the push-up bar upward by contacting the roller between the hole and the hole.