JP3180508B2 - Circuit breaker control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker control device capable of adjusting an opening time.

[0002]

2. Description of the Related Art In a conventional circuit breaker, a control device for a circuit breaker which has received a disconnection command excites an electromagnetic coil, and stores an energizing force in a transmission mechanism section in which a movable-side electrode is held in a closed state in a breaking section. To release. As a result, the movable-side electrode is separated from the fixed-side electrode, and the circuit breaker is opened. The time required for the movable electrode to mechanically separate from the fixed electrode is called the opening time.This opening time takes into account the breaking performance of the circuit breaker and the characteristics of the circuit to which the circuit breaker is applied. Should be adjusted appropriately.

In the conventional circuit breaker, the opening time is defined as the time from when the electromagnetic coil is excited to when the stored transmission mechanism releases the stored power and loses its holding function. The method was changed and adjusted. (1) Change the moving distance of the movable iron core of the electromagnetic coil. (2) Change the weight of the movable iron core of the electromagnetic coil. (3) The time constant of the current flowing through the electromagnetic coil is changed by connecting a coil or the like in series with the electromagnetic coil to change the inductance.

[0004]

In the conventional circuit breaker control device, when the contact opening time is increased, there are various methods such as increasing the moving distance of the movable iron core or making the movable iron core heavier. However, according to this method, the control device of the circuit breaker becomes large, the frictional force on the contact sliding surface between the movable iron core and the electromagnetic coil increases, and the operation time becomes unstable. There was a problem. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a small and highly reliable circuit breaker control device capable of easily adjusting the opening time with a simple configuration. Aim.

[0005]

According to the present invention, there is provided a control device for a circuit breaker, comprising: a movable portion which is attracted to a fixed portion by an electromagnetic coil excited when a disconnection command is issued; A lever for releasing the transmission mechanism portion charged to drive the arm, and an arm having a detachable weight and interlocking with the lever, wherein the lever and the arm are combined when the lever is released. An arm configured so that the position of the center of gravity of the body passes above the center of rotation of a vertical line including the center of rotation of the lever.

[0006]

In the control device for a circuit breaker according to the present invention, the transmission mechanism stored for driving the contacts of the circuit breaker is released by the lever rotated by the attraction force of the electromagnetic coil. At this time, the arm having the weight rotates integrally with the lever. In the pivoting operation of the complex of the lever and the arm, the gravity of the complex is attracted by the electromagnetic coil until the center of gravity of the complex passes above the center of rotation of the vertical line including the center of the turning point of the lever. As a result of substantially opposing the force, the lever is pivoted by a small driving force and its pivoting speed is reduced. After the center of gravity of the complex passes through the vertical line, a part of the gravity of the complex acts to add to the suction force. As a result, the lever at this time is rotated by a large driving force and stored. The release operation of the transmission mechanism can be easily performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the circuit breaker control device according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a main part of a circuit breaker control device of the present embodiment, and FIG. 2 is a side view of a vacuum circuit breaker provided with the control device of FIG. The vacuum circuit breaker shown in FIG. 2 is disposed on a trolley 6 having wheels 7,
An interrupting section 1 for opening and closing an electric circuit, a main circuit section 2 containing a main circuit conductor in an insulating case, an operating mechanism section 3 for opening and closing the interrupting section 1, and an opening and closing operation of the operating mechanism section 3. The control device 4 includes a control device 4 for controlling and a transmission mechanism 5 for transmitting the driving force of the operation mechanism 3 to the movable electrode.

[0008] The movable-side electrode in the cut-off section 1 includes a contact pressure spring 8 for applying a contact pressure load between the fixed-side electrode and the movable-side electrode.
Are connected to the transmission mechanism unit 5 via an insulating rod 9 that electrically insulates between the main circuit unit 2 and the transmission mechanism unit 5.
The transmission mechanism 5 is provided with an opening spring 10, which constantly biases the movable electrode in the separating direction. In the closed state of the vacuum circuit breaker shown in FIG. 2, the driving force in the contact separating direction by the contact pressure spring 8 and the release spring 10 is such that the trip latch 11 of the transmission mechanism 5 is engaged with the lever 15 of the control device 4. Therefore, it is held by the transmission mechanism 5.

FIG. 1 is a side view showing the control device 4 when the vacuum circuit breaker of the present embodiment is turned on. Control device 4
Converts the electric signal of the cutoff command into a mechanical operation, rotates the trip latch 11 of the transmission mechanism 5, releases the stored transmission mechanism 5, and opens the contact of the interruption section. Things. In FIG. 1, an electromagnetic coil 12 provided in a control device 4 is housed in a case 18 and penetrated by a fixed iron core 13 and a movable iron core 14 made of a magnetic metal. The fixed iron core 13 fixed to the case 18 is penetrated by a sliding rod 14a that slides in the axial direction, and the sliding rod 14a is fixed to one end of the movable iron core 14. Sliding rod 14a penetrating fixed iron core 13
Two fixing nuts are screwed into the threaded tip of the above. For this reason, the movable iron core 14 is configured to be able to move by a predetermined distance in the axial direction with respect to the fixed iron core 13. Further, since the return spring 19 is provided between the fixed iron core 13 and the movable iron core 14, the movable iron core 14 is always urged in a direction away from the fixed iron core (rightward in FIG. 1). ing. In addition, a magnetic shielding plate 14b made of a non-magnetic metal is provided on a collision surface of the movable iron core 14 with the fixed iron core 13, so as to reduce the attracting action by the magnetic force.

A lever 15 is connected to the movable iron core 14 and is disposed so as to penetrate a hole formed in the movable iron core 14.
The provided pin 14c is loosely fitted in a cob hole 15a formed in the lever 15. As shown in FIG.
The lower end portion of the transmission mechanism 5 is formed with a bifurcated engagement portion 15c, and the projection 11a formed on the trip latch 11 of the transmission mechanism 5 is arranged to be able to engage with the engagement portion 15c. . As shown in FIG. 1, a bow-shaped arm 16 is fixed to the lever 15 with a bolt or the like so as to protrude upward. The arm 16 is made of a lightweight metal material, for example, an aluminum material, so that the weight is reduced. Various weights 17 are detachably fixed to the projecting end of the arm 16 by bolts or the like.

An opening operation in the control device of the present embodiment configured as described above will be described. When the control device 4 shown in FIG. 1 is turned on, the locking portion 20 of the transmission mechanism 5 interlocked with the movable-side electrode always rotates counterclockwise around the shaft 20 a by the elastic force of the contact pressure spring 8 and the release spring 10 ( 1 (in the direction indicated by arrow F in FIG. 1). However, in the transmission mechanism 5 in the closed state, the protrusion 11b of the trip latch 11 is in contact with the locking portion 20 so as to resist the turning power.

In the closed state, when an electric signal of a cutoff command is input to the control device 4, the electromagnetic coil 12 is excited, and the movable iron core 14 is attracted and moved in the direction of the fixed iron core 13. At this time, the arm 16 having the lever 15 and the weight 17 rotates counterclockwise about the rotation shaft 15b. Since the center of gravity G of the composite of the lever 15 and the arm 16 is on the right side of the vertical line L including the center of the rotation axis 15b of the lever 15, that is, on the side where the electromagnetic coil 12 is not provided, the gravity of the composite is The force of the horizontal component is acting to the right, and the gravity of the complex is acting substantially against the attractive force of the electromagnetic coil 12 on the movable iron core 14.
For this reason, the suction speed of the movable iron core 14 decreases, and as a result, the contact opening time of the contact of the blocking unit 1 increases. Thus, the suction speed of the movable iron core 14 at the beginning of the opening operation can be reduced by changing the position of the center of gravity G and the magnitude of gravity of the combined body.

FIG. 3 shows an intermediate state in the opening operation of the control device 4. In the state shown in FIG.
The center of gravity G of the complex of the arm 15 and the arm 16 is on the left side of the vertical line L including the rotation axis 15 b of the lever 15, that is, the electromagnetic coil 1
2, the force of the horizontal component of the gravitational force of the composite works to the left, and the gravitational force of the composite is substantially equal to the attraction of the movable iron core 14 by the electromagnetic coil 12. Acting in the same direction, the attractive force of the electromagnetic coil 12 is not substantially impaired by this gravity. At this time, lever 15
The engaging portion 15c pushes the protrusion 11a of the trip latch 11 clockwise to rotate the trip latch 11.
As a result, the roller 20b of the locking portion 20 and the protruding portion 11b of the trip latch 11 do not come into contact with each other, the locking portion 20 rotates counterclockwise about the shaft 20a, and the opening operation ends. FIG. 4 shows a state in which the opening operation has been completed. Therefore, when the lever 15 rotates the trip latch 11 to lose the holding function of the transmission mechanism 5, a part of the gravitational force of the complex acts on the lever 15 together with the suction force of the electromagnetic coil 12, so that the lever 15 The release operation by 15 is performed reliably.

[0014]

As described above, according to the present invention, an arm is provided on a lever interlocked with a movable iron core driven by an electromagnetic coil, and the position of the center of gravity of the complex of the lever and the arm during the opening operation is determined. By passing through a vertical line including the center of the rotation axis of the breaker, it is possible to easily adjust the opening time of the breaker contact, and to obtain a small and highly reliable circuit breaker control device. it can.

[Brief description of the drawings]

FIG. 1 is a side view showing a closed state of a control device for a circuit breaker according to the present invention.

FIG. 2 is a side view of a vacuum circuit breaker provided with the control device of FIG. 1;

FIG. 3 is a side view showing a state during an opening operation in the control device of FIG. 1;

FIG. 4 is a side view showing an end state of the opening operation in the control device of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Interruption part 4 Control device 5 Transmission mechanism part 12 Electromagnetic coil 13 Fixed iron core 14 Movable iron core 15 Lever 16 Arm 17 Weight

Claims (1)

(57) [Claims] A movable unit that is attracted to a fixed unit by an electromagnetic coil that is excited when an interruption command is issued, a lever that releases a transmission mechanism unit that is charged to drive a contact of the interruption unit by an attraction operation of the movable unit, has a loading and unloading possible weight, and an arm that works with release operation of the lever, the vertical line position of the center of gravity of the complex of the lever and the arm containing the center of rotation of the lever during the release operation of the lever An arm configured to pass through the control device.