JPH02223306A - Interlocking device of drawer type electric equipment - Google Patents

Abstract

PURPOSE:To prevent a useless closing of pole of a breaker and the like by locking a making control button with a making blocking plate in the case where a drawer type electric equipment is halfway between the disconnecting position and the making position. CONSTITUTION:In case there is a drawer type electric equipment on the way to the disconnecting position and the making position, an interlocking pin 51 of an interlock section is brought into contact slidingly with the surface of a rail of an interlocking plate 11 provided a switchboard and the like. Namely, it is held at a prohibited position and is pushed up against energizing force of a compressing spring 53. At the same time, a making blocking plate 54 fixed to the interlocking pin 51 is also driven upward by a pin 6c as a guide, and it gets into an operating space of the making control button 27. Even if the making control button 27 is tried to rotate counter clockwise under such a state, the making blocking plate 54 comes into collision with the making control button 27, the making control button 27 can't rotate, a control mechanism 2 doesn't work, and a pole of a breaker is not closed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an interlock device for draw-out type electrical equipment such as a circuit breaker.

C. Prior Art] The operation of a general interface 7 of a draw-out electric device such as a circuit breaker will be explained with reference to FIGS. 4, 5, and 6.

In the figure, a drawer-type electric device 1 is mechanically connected to an operating mechanism section 2, a breaker 3, a crossbar portion 4 for transmitting the driving force of the operating mechanism section 2 to the breaker, and an operating mechanism section 2. It has an interlock part 5, a connector part 8 of the breaker 3, etc., and these members are attached to a housing 6 having wheels 7.

On the other hand, the fixed frame 10 stored in a switchboard etc. has terminals 12,
It consists of a frame 13, interlock provisional 1), etc.

FIG. 4 shows a state in which the drawer-type electric device 1 is pulled out from the fixed frame 10 to the disconnection position. FIG. 5 shows a state in which the drawer-type electric device 1 is at an intermediate position between the disconnection position and the input position with respect to the fixed frame 10.

Further, FIG. 6 shows a state in which the drawer-type electric device 1 is inserted into the fixed frame 10 to the insertion position.

In FIG. 4, the interlock pin 51 of the interlock part 5 is engaged with the hole 1) a of the interlock plate 1). Also, in FIG. 6, the interlock pin 51 is engaged with the hole 1)b of the interlock plate 1). As a result, the drawer-type electric device 1 becomes immovable. Also,
In FIG. 5, the interlock pin 51 is in sliding contact with the rail surface of the interlock plate 1).

FIG. 2 shows a conventional interlock device for drawer-type electrical equipment.

In FIG. 2, the cam 22 is fixed to the shaft 21;
is rotatably supported by the housing 6. Further, a trip lever 23 is rotatably supported on the shaft 21, and the trip lever 23 and the cam 22 rotate asynchronously.

A link 24 is connected to the trip lever 23 by a pin 23a, and a main link 25 is connected to the link 24 by a pin 25a. The input operation button 27 is connected to the shaft 26
It is rotatably supported with respect to the housing 6 about the center.

Further, a loading support 28 that rotates in conjunction with the loading operation button 27 is rotatably supported around a shaft 26. Further, a trip launch 30 is rotatably supported on the housing 6 about a shaft 29. The operation mechanism section 2 is constituted by each of the above-mentioned elements.

Next, the crossbar portion 4 includes a lever 42 rotatably supported on the housing 6 about a shaft 41, a tension spring 43, and the like. The lever 42 is connected to the main link 25 of the operating mechanism section 2 by a pin 42a. Also, one end of the tension spring 43 is connected to the lever 4 by a pin 42b.
It is connected to 2. Further, the lever 42 is connected to a movable contact portion (not shown) of the breaker by a pin 42c. The other end of the tension spring 43 is connected to a pin 6a fixed to the housing 6, and the lever 42 is constantly biased with a clockwise rotational force.

The interlock portion 5 includes an interlock pin 51 that is slidably supported in the vertical direction by a guide 52 fixed to the housing 6, and is implanted in the interlock pin 51 at right angles (that is, horizontally) to the sliding direction of the interlock pin 51. The operating handle 51a5 is provided between the guide 52 and the operating handle 51a, and is composed of a compression spring 53 that constantly urges the interlock pin 51 to move downward, and an interlock lever 51b fixed to the interlock pin 51. has been done. Further, the housing 6 includes an opening operation rod 71, a closing operation rod 72, a control coil section 73, etc. for transmitting the opening/closing command given electrically or mechanically to the breaker to the operation mechanism section 2. It is provided. Although the positional relationship of each element is depicted in a two-dimensional manner in FIG. 2, in reality, each element is arranged three-dimensionally so that its movement is not obstructed.

Next, malfunction of the circuit breaker in the process of moving the drawer-type electric device 1 from the disconnection position to the closing position or from the closing position to the disconnecting position, that is, in the state shown in FIG. 5, will be explained.

When the interlock pin 51 is driven (lifted) upward in the figure from the state shown in FIG. 2, the interlock lever 151b fixed to the interlock pin 51 is also driven upward. At this time, the interlock lever 51b and the protrusion 71a provided on the opening operation rod 71 come into contact, and the rod 71 is driven upward. (Not shown for obvious reasons) As shown in FIG. 3 below, the protrusion 71b provided on the rod 71 comes into contact with the claw 30a provided on the trip launch 30, and the trip latch 30 is rotated clockwise.

If the input operation button 27 is pressed by mistake in this state, the input support 28 rotates counterclockwise about the shaft 26. As a result, the locking of the cam 22 is released, and the cam 22 begins to rotate counterclockwise due to the biased rotational force (biasing means not shown). At this time, the cam 22 comes into contact with a roller 25b built into the main link. At the moment of this contact, the rotational force F of the cam 22 acts on the bin 25a, and the roller 25. b is pushed down in the figure. This force F is applied to the center of rotation (shaft 21) of the cam 22 and the arc center 22b of the outer circumferential surface of the cam 22 in contact with the roller 25b.
This is the component of the rotational moment in the direction connecting the arc center 22b and the center of the bottle 25a, with the arm length being the length connecting them.

At this time, since the roller 23b and the trip latch 30 are not in contact with each other, the trip lever 23 can rotate clockwise. Therefore, the pin 23a does not function as a fixed rotating shaft.

On the other hand, at the moment when the roller 25b and the cam 22 come into contact, a force Fa (between the center of the pin 42a and the pin 25a
The force Fb (component in the direction connecting the centers of the pins 23a and 25a) that attempts to rotate the trip lever 23 clockwise is much larger than the force Fb (the component in the direction connecting the centers of the pins 23a and 25a). Therefore, the circuit breaker (not shown) is driven in the direction of temporally closing.

[Problem to be solved by the invention]

As described above, in the conventional interlock device for drawer-type electrical equipment, the closing operation lever 27 is accidentally pressed during the movement of the drawer-type electrical equipment from the disconnection position to the closing position or from the closing position to the disconnection position. In this case, the circuit breaker is driven in the direction of closing. However, the stroke of the closing operation of the breaker depends on the angle of the main link 25, that is, the pin 4.
2a and the center of the pin 25a and the arc center 22
It is determined by the angle θ formed by the line connecting b and the center of the pin 25a, the strength of the tension spring 43, the rotational force of the cam 22, etc., but the movable contact and the fixed contact of the breaker may come into contact. In this case, there is a problem in that current flows through the main circuit even though the draw-out electric device is not fixed, causing an arc to occur at a portion of the breaker connector.

This invention was made in order to solve the above-mentioned problems, and provides an interlock for draw-out electrical equipment that prevents the breaker, etc. from being driven in the closing direction when the draw-out electrical equipment is not fixed. The purpose is to provide equipment.

(!!! Means for Solving the Problem) An interlock device for a drawer-type electric device according to the present invention includes a housing having a power switching device and an operating mechanism thereof, and a housing provided in the housing and arranged vertically. A sliding interlock pin, a spring means for biasing the interlock bin in one direction, at least two holes provided in a fixed frame of a power distribution board etc. that engage the interlock pin, and a spring means for urging the interlock pin in one direction; an interlock plate having a rail surface that is in sliding contact with the interlock plate; in a state where the interlock pin is in sliding contact with the rail surface of the interlock plate, the interlock pin interferes with the operating space of at least one member of the operating mechanism section; It is equipped with an input prevention plate that prevents the operation of the member.

(Function) The casing has wheels and the like, and is pulled out and attached to a fixed frame such as a switchboard.

The interlock pin is constantly biased by a spring means to be driven, for example, vertically downward, and is set to the closing position and the like by engaging with one of two holes in an interlock plate provided in a fixed frame of a switchboard, etc. Fix the housing in the disconnected position. Also, when it is in sliding contact with the rail surface of the interlock plate, A
I'm being pushed up.

The input blocking plate is directly fixed to the interlock pin or is driven in conjunction with the operation of the interlock pin, so that the interlock pin prohibits 4klf and 4L1! When it is in the operating mechanism, for example, it invades the closing stroke of the closing operation button and interferes with the operating space of the closing operation button. If the input operation button is attempted to be pushed in in this state, the input operation button and input prevention plate will collide, and the input operation button will no longer be able to operate. Therefore, the operating mechanism section does not operate, and the contacts of power switching devices such as circuit breakers are not closed.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An interlock device for a drawer-type electric device according to the present invention will be described with reference to FIG. 1 showing one embodiment thereof.

In FIG. 1, the cam 22 is fixed to the shaft 21;
is rotatably supported by the housing 6. A trip lever 23 is also rotatably supported on the shaft 21, and the trip lever 23 and the cam 22 rotate asynchronously.

A link 24 is connected to the trip lever 23 by a pin 23a, and a main link 25 is connected to the link 24 by a pin 25a. The input operation button 27 is connected to the shaft 26
It is rotatably supported with respect to the housing 6 about the center.

Further, a loading support 28 that rotates in conjunction with the loading operation button 27 is rotatably supported around a shaft 26.

In addition, the housing 6 has a trip latch 30 centered around the shaft 29.
is rotatably supported.

The operation mechanism section 2 is constituted by each of the above-mentioned elements.

Next, the crossbar portion 4 includes a lever 42 rotatably supported on the housing 6 about a shaft 41, a tension spring 43, and the like. The lever 42 is connected to the main link 25 of the operating mechanism 2 by a pin 42a. Also, one end of the spring 43 is connected to the lever 4 by the pin 42b.
It is connected to 2. Furthermore, the lever 42 is connected to a movable contact portion (not shown) of the circuit breaker 3 via a pin 42e. The other end of the tension spring 43 is connected to a pin 6a fixed to the housing 6, and the lever 42 is constantly biased with a clockwise rotational force.

The interlock portion 5 is an interlock bin 51 that is slidably supported in the vertical direction by a guide 52 fixed to the casing 6, and is implanted in the interlock bin 51 at right angles (that is, horizontally) to the sliding direction of the interlock bin 51. operating handle 51a,
A compression spring 53 is provided between the guide 52 and the operating handle 51a and always applies a downward driving force to the interlock pin 51, an interlock lever 51b fixed to the interlock pin 51, and the interlock pin 51. It is comprised of a charging blocking plate 54 and the like fixed to the upper end of the housing with bolts or the like. An oblong hole 54a is provided on one surface of the input blocking plate 54, and a bottle 6c fixed to the housing 6 is inserted into the hole 54a.
serves as its guide and is slidably fitted into the oblong hole 54a.

Further, the housing 6 is provided with an opening operation rod 71, a closing operation rod 72, a control coil section 73, etc. for transmitting opening/closing commands electrically or mechanically given to the breaker to the operation mechanism section 2. ing. Although the positional relationship of each element is depicted in a two-dimensional manner in FIG. 1, in reality, each element is arranged three-dimensionally so as not to hinder its movement.

In general, interlock devices for draw-out electrical equipment must satisfy the following functions.

(1) The drawer-type electrical equipment must be securely fixed in the disconnection position and the input position, and the breaker can be opened and closed only in this state.

(2) In the process of moving from the disconnection position to the closing position or from the closing position to the new path position, the disconnection shall not be closed unless an electrical or mechanical closing command is given.

(3) When the breaker is closed, the draw-out electrical equipment cannot be moved from the disconnection position to the closing position or from the closing position to the disconnection position, and (4) when the breaker is opened. The draw-out electrical equipment shall only be movable from the new position to the input position or from the input position to the new position only when it is in the closed position.

Next, the operation of the above embodiment will be explained.

In FIG. 1, the drawer-type electric device 1 is in the closing position or the disconnecting position □, the breaker (not shown) is in the open state, and when the circuit breaker (not shown) is turned on, the spring (not shown) is energized. In this state, when the closing operation button 27 is pressed, the closing support 28 rotates counterclockwise around the shaft 26.This releases the latching of the cam 22, and the cam 22 releases its bias. The cam 22 starts to rotate counterclockwise due to the rotational force (biasing means not shown). At this time, the cam 22 comes into contact with the roller 25b built in the main link. Due to this contact, the rotation of the cam 22 is applied to the bin 25a. A force acts on the roller 25b
is pushed down in the figure. However, since the trip lever 23 is prevented from rotating clockwise by the trip launch 3o, the bin 23a substantially functions as if it were fixed to the housing 6. Therefore, roller 2
5b rotates counterclockwise around the bin 23a.

The roller 25b rotates until it reaches the circular arc having the maximum radius of the cam 22, and when the cam 22 stops, its rotation also stops. At this time, the bin 42a of the crossbar portion 4 is pushed down by the main link 25, and the lever 42 rotates counterclockwise against the biasing force of the tension spring 43. Rotation of the lever 42 drives and closes a movable contact of the interrupter (not shown as it is known in the art).

Next, as shown in FIG. 5, for example, when the drawer-type electric device 1 is in the middle of its disconnection position and input position, the interlock pin 51 of the interlock portion 5 is connected to an interlock plate provided on a switchboard or the like 10. 1) is in sliding contact with the rail surface. That is, in FIG. 1, as shown by the dashed line, the input is pushed up (pushed up) at 1i, i@ against the biasing force of the compression spring 53, and at the same time is fixed to the interlock pin 51. The blocking plate 54 is also driven upward using the pin 6C as a guide, and enters into the operation space of the closing operation button 27.

If you try to rotate the loading operation button 27 counterclockwise in this state, the loading blocking plate 54 and the loading operation button 27 will collide (interference), and the loading operation button 27 will not be able to rotate. 2 does not operate and the circuit breaker is not closed.

It goes without saying that the draw-out type electrical equipment is a breaker such as a vacuum breaker or a gas breaker, or a contactor.

(Effects of the Invention) As described above, according to the present invention, when the interlock pin is not engaged with the interlock plate, that is, when the drawer-type electrical equipment is in the middle between the disconnection position and the closing position, the loading is prevented. Because the plate interferes with (collides with) at least one member of the operating mechanism, such as the closing operation button, the operating mechanism cannot operate, and the power switchgear of drawer-type electrical equipment, such as a circuit breaker, is closed. It has the effect of not being

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an embodiment of an interlock device for a drawer-type electrical device according to the present invention, Fig. 2 is a diagram showing an interlock device for a conventional drawer-type electrical device, and Fig. 3 is a diagram showing a conventional interlock device for a drawer-type electrical device. Diagrams illustrating malfunctioning conditions in equipment, Figures 4 and 5
FIG. 6 is a diagram showing an interlock of a general draw-out type electric IIH. In the figure, 2 is an operating mechanism section, 6 is a housing, 1) is an ink-lock plate, 51 is an interlock pin, and 54 is an input blocking plate. Wealth 1wA 2: Operation mechanism section

Claims (1)

[Claims] (1) A casing that includes a power switching device and its operating mechanism; an interlock pin provided in the casing that slides in the vertical direction; a spring means that biases the interlock pin in one direction; a switchboard, etc. an interlock plate provided in a fixed frame of the interlock plate and having at least two holes that engage with the interlock pin and a rail surface that makes sliding contact with the interlock pin; An interlock device for a drawer-type electric device, comprising: a closing prevention plate that interferes with the operating space of at least one member of the operating mechanism section and prevents the operation of the member in a state of sliding contact.