JP2007109503A - Control method of electromagnetic actuator, and switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic actuator which carries out opening-circuit action steadily even when closing-circuit action is carried out. <P>SOLUTION: The electromagnetic actuator comprises a closing-circuit coil 18 to close and an opening-circuit coil 19 to open a pair of contacts 3, 4 in free contact and separation, a limit switch 12 for closing circuit which changes from closed circuit to open circuit at the time of closed circuit of the contacts 3, 4, a limit switch 13 for opening circuit which changes from open circuit to closed circuit at the time of closed circuit of the contacts 3, 4, a relay for closing circuit which excites the closing-circuit coil 18 at closing of the limit switch 12 for closing circuit, a relay for opening circuit which excites the opening-circuit coil 19 at closing of the limit switch 13 for opening circuit. The limit switch 13 for opening circuit is changed from opening to closed circuit after the limit switch 12 for closing circuit is changed from opening to closed circuit. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for controlling an electromagnetic actuator for opening / closing a switch and a switch using the same.

  Conventional switch operating mechanisms such as vacuum circuit breakers and vacuum switches are known that use electromagnetic actuators that generate the required operating force to perform open and close operations (for example, patents). Reference 1).

  As shown in FIG. 3, this type of switch is configured to open / close the blocking portion 1a that cuts off the current from the upper portion of the drawing, the wipe spring portion 1b that applies a contact load when the blocking portion 1a is closed, and the breaking portion 1a at the lowest portion of the drawing An operating mechanism 1c is arranged and configured. In FIG. 3, the closed state is shown on the right side of the figure, and the open state is shown on the left side of the figure.

  The blocking part 1 a is provided with a vacuum valve 5 having a pair of contacts 3 and 4 that can be contacted and separated within the vacuum insulating container 2. The fixed side of the vacuum valve 5 is fixed to the upper conductor 6. Further, a lower conductor 7 is provided on the movable side of the vacuum valve 5 and is connected to an insulating operation rod 8 that is movable in the axial direction.

  The wipe spring portion 1 b is provided with a wipe spring folder 10 that houses a wipe spring 9 connected to the insulating operation rod 8. The wipe spring 9 applies a contact load when the pair of contacts 3 and 4 are in contact with each other. Further, an operation rod 11 described later is connected to the wipe spring folder 10. The operating rod 11 is provided with a closing limit switch 12 and an opening limit switch 13 fixed to a fixing member of a switch (not shown) so as to open and close when the operating rod 11 moves.

  The operation mechanism unit 1c is provided with an electromagnetic actuator 14 that generates an operation force during an opening / closing operation. The electromagnetic actuator 14 includes a yoke 15 for forming a magnetic path, a magnetic armature 16 provided to move in the yoke 15, a permanent magnet 17 for moving or holding the closed circuit of the armature 16, and an outer periphery of the permanent magnet 17. The closed coil 18 and the open coil 19 disposed on the armature 16, the non-magnetic operating rod 11 fixed to the armature 16 and penetrating the yoke 15, and the non-magnetic stopper plate 20 closing the opening of the lower portion of the yoke 15. Has been. The electromagnetic actuator 14 is fixed to the lower fixing member 21, and an open spring 22 is provided at the end of the operating rod 11 in the lower fixing member 21 to urge the operating rod 11 to move in the opening direction.

  As shown in FIG. 4, the control circuit for the electromagnetic actuator 14 includes a closing command switch 24 for closing the switch between signals of a DC power source 23 by a signal from a control room (not shown), and switching from a closed circuit to an open circuit during the closing of the switch. The closing limit switch 12 and the closing relay 25 to be switched are connected in series. Further, a closing auxiliary switch 26 and a closing coil 18 which are closed when the closing relay 25 is operated are connected in series.

  Further, between the DC power sources 23, when a closing command switch 27 that opens the switch by a signal from a control room (not shown) and the closing limit switch 12 is opened in the middle of the closing of the switch, the switching from the opening to the closing is performed at the same time. An opening limit switch 13 and an opening relay 28 are connected in series. Further, an opening auxiliary switch 29 and an opening coil 19 that are closed when the opening relay 28 is operated are connected in series.

  When the closed state is set, as shown in FIG. 5, the closing command switch 24 is closed at time t1. Then, the closing relay 25 is excited, the closing auxiliary switch 26 is closed at a time t2 after a predetermined operating time tx of several ms, and a current flows through the closing coil 18. As a result, the armature 16 starts moving in the closing direction, and the contacts 3 and 4 of the vacuum valve 5 come into contact. At time t3 in the middle of contact, the closing limit switch 12 is switched from closing to opening. Then, the excitation of the closing relay 25 is released, the closing auxiliary switch 26 is opened at time t4, and the current of the closing coil 18 is cut off. After the interruption, the armature 16 is attracted by the permanent magnet 17 and the closed state is maintained.

  Here, the open circuit limit switch 13 is configured to switch from the open circuit to the closed circuit at the same time that the close circuit limit switch 12 is switched from the closed circuit to the open circuit.

When the circuit is to be opened, the circuit opening command switch 27 is closed at time t5. Then, the opening relay 28 is excited, the opening auxiliary switch 29 is closed at a time t6 after a predetermined operation time ty of several ms from the time t3 when the opening limit switch 13 is switched, and a current flows through the opening coil 19. . This overcomes the attractive force of the permanent magnet 17 and moves the armature 16 in the opening direction, thereby opening the contacts 3 and 4 of the vacuum valve 5. In the middle of the opening, the opening limit switch 13 is switched from the closed circuit to the open circuit. Then, the excitation of the opening relay 28 is released, the opening auxiliary switch 29 is opened, and the current of the opening coil 19 is interrupted. Thereafter, the open circuit state is maintained by the open circuit spring 22.
JP 2002-270423 A (4th page, FIG. 1)

  The conventional electromagnetic actuator 14 has the following problems.

  Immediately after closing the switch, the main circuit becomes abnormal due to an overcurrent or the like, and when the circuit is opened immediately, the time until the circuit is opened may be long. As shown in FIG. 5, when the open circuit command switch 27 is closed at time t5 before time t4 when the closing coil 18 is excited and cut off at time t2, the opening limit is set at time t3 before time t4. Since the switch 13 is switched from the open circuit to the closed circuit, current starts to flow through the open coil 19 from time t6 after the operation time ty of the open relay 28.

  This is that the open coil 19 is excited while the closed coil 18 is excited. As a result, the magnetomotive force by the open coil 19 is reduced, and the movement of the armature 16 is delayed. That is, the interruption performance is degraded.

  For this reason, even during the closing operation in which the closing coil 18 is energized, when the opening command switch 27 is closed, a control method is desired in which the opening coil 19 is sufficiently excited and the opening operation can be surely performed. .

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a method for controlling an electromagnetic actuator that can reliably perform an opening operation even when an opening command is given during the closing operation.

  In order to achieve the above object, the electromagnetic actuator control method of the present invention includes a closing coil for closing a pair of contactable and separable contacts, an opening coil for opening, and a closing limit for switching from closing to opening when the contacts are closed. A switch, an opening limit switch that switches from opening to closing when the contact is closed, a closing relay that excites the closing coil when the closing limit switch is closed, and the opening coil when the opening limit switch is closed. And an opening relay that excites, and the opening limit switch switches from opening to closing after the closing limit switch is switched from closing to opening.

  According to the present invention, after the current of the closing coil that closes the switch is interrupted, the opening coil that opens the switch is excited, so even if an opening command is given during the closing operation, The opening operation can be surely performed by the strong magnetomotive force of the opening coil.

  Embodiments of the present invention will be described below with reference to the drawings.

  A method for controlling an electromagnetic actuator according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a configuration of a switch using an electromagnetic actuator according to an embodiment of the present invention, and FIG. 2 is a chart diagram showing an operation of a control circuit of the electromagnetic actuator according to the embodiment of the present invention. In addition, in each figure, the same code | symbol was attached | subjected about the component similar to the past. The control circuit for operating the electromagnetic actuator is the same as that shown in FIG.

  As shown in FIG. 1, the switch includes a blocking portion 1a that cuts off current from the upper part of the figure, a wipe spring part 1b that applies a contact load when the breaking part 1a is closed, and an operating mechanism that opens and closes the blocking part 1a at the lowest stage of the figure. The part 1c is arranged and configured. In FIG. 1, the closed state is shown on the right side of the figure, and the open state is shown on the left side of the figure.

  The blocking part 1 a is provided with a vacuum valve 5 having a pair of contacts 3 and 4 that can be contacted and separated within the vacuum insulating container 2. The fixed side of the vacuum valve 5 is fixed to an upper conductor 6 fixed to a fixing member of a switch (not shown). Further, a lower conductor 7 is provided on the movable side of the vacuum valve 5, and an insulating operation rod 8 is connected via a movable conductor that is slidably contacted in an axial direction.

  The wipe spring portion 1 b is provided with a wipe spring folder 10 that houses a wipe spring 9 connected to the insulating operation rod 8. The wipe spring 9 applies a contact load when the pair of contacts 3 and 4 are in contact with each other. Further, an operation rod 11 described later is connected to the wipe spring folder 10. The operating rod 11 is provided with a closing limit switch 12 and an opening limit switch 13 fixed to a fixing member of a switch (not shown) so as to open and close when the operating rod 11 moves. The operating rod 11 is connected to the blocking portion 1a via the wipe spring 9 and the insulating operating rod 8, and serves as a movable shaft that opens and closes the contacts 3 and 4.

  Here, the opening limit switch 13 is operated so as to operate slower than the closing limit switch 12. That is, at the time of closing, the operating rod 11 moves and the opening limit switch 13 switches from opening to closing so as to switch later than when the closing limit switch 12 switches. For example, if the closing limit switch 12 and the opening limit switch 13 are arranged apart from each other, a time difference can be given to the opening / closing operations of the limit switches 12 and 13.

  The operation mechanism unit 1c is provided with an electromagnetic actuator 14 that generates an operation force during an opening / closing operation. The electromagnetic actuator 14 includes a yoke 15 for forming a magnetic path, a magnetic armature 16 provided to move in the yoke 15, a permanent magnet 17 for moving or holding the closed circuit of the armature 16, and an outer periphery of the permanent magnet 17. The closed coil 18 and the open coil 19 disposed on the armature 16, the non-magnetic operating rod 11 fixed to the armature 16 and penetrating the yoke 15, and the non-magnetic stopper plate 20 closing the opening of the lower portion of the yoke 15. Has been. The electromagnetic actuator 14 is fixed to the lower fixing member 21, and an open spring 22 is provided at the end of the operating rod 11 in the lower fixing member 21 to urge the operating rod 11 to move in the opening direction.

  Next, the case where it will be in a closed state is demonstrated with reference to FIG.

  As shown in FIG. 2, the closing command switch 24 is closed at time t1. Then, the closing relay 25 is excited, the closing auxiliary switch 26 is closed at time t2 after a predetermined operating time tx of several ms, and the closing coil 18 is excited. As a result, the armature 16 starts moving in the closing direction, and the closing limit switch 12 is switched from the closing state to the opening state at the time t3 in the middle of the closing time when the contact of the contacts 3 and 4 of the vacuum valve 5 is completed. Then, the excitation of the closing relay 25 is released, the closing auxiliary switch 26 is opened at time t4, and the current of the closing coil 18 is cut off. After the interruption, the armature 16 is attracted by the permanent magnet 17 and the closed state is maintained.

  Here, the open circuit limit switch 13 is switched from the open circuit to the closed circuit at a time t7 that is later than the time t3 when the circuit limit switch 12 is switched. That is, the current of the closed coil 18 is cut off (time t4), and the time t8 when the current becomes zero is switched to the previous time t7 considering a predetermined operation time ty of several ms (time t7 = t8). -Ty). Since the operation time ty can be grasped in advance from the performance of the opening relay 28, the time t7 can be set.

  Thus, when the opening command switch 27 is closed at time t5 before time t3, the closing limit switch 12 is switched at time t3, but the opening limit switch 13 is switched at time t7 which is later than this. Then, after the operation time ty of the opening relay 28, the opening auxiliary switch 29 is closed at time t8, and the opening coil 19 is excited. This overcomes the attractive force of the permanent magnet 17 and moves the armature 16 in the opening direction, thereby opening the contacts 3 and 4 of the vacuum valve 5. The open coil 19 is excited without being influenced by the closed coil 18 side, and can move the armature 16 with a large magnetomotive force.

  In the middle of the circuit opening, the circuit opening limit switch 13 is switched from the circuit closing to the circuit opening, the excitation of the circuit opening relay 28 is released, the circuit opening auxiliary switch 29 is opened, and the current of the circuit opening coil 19 is interrupted. Thereafter, the open circuit state is maintained by the open circuit spring 22. At the time of opening, the opening limit switch 13 is switched from closed to open, but the closing limit switch 12 is switched from open to closed before that.

  According to the control method of the electromagnetic actuator 14 of the above embodiment, the open circuit limit switch 13 is switched from the open circuit to the closed circuit so that the open circuit coil 19 is excited after the current of the closed circuit coil 18 is interrupted. Even during the closing operation in which the closing coil 18 is excited, when the opening command switch 27 is closed, the opening coil 19 is excited, and the opening operation can be surely performed by the strong magnetomotive force.

The figure which shows the structure of the switch using the electromagnetic actuator which concerns on the Example of this invention. The chart figure which shows operation | movement of the control circuit of the electromagnetic actuator which concerns on the Example of this invention. The figure which shows the structure of the switch using the conventional electromagnetic actuator. The control circuit diagram which operates an electromagnetic actuator. The chart which shows operation | movement of the control circuit of the conventional electromagnetic actuator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Blocking part 1b Wipe spring part 1c Operation mechanism part 2 Vacuum insulation container 3, 4 Contact 5 Vacuum valve 6 Upper conductor 7 Lower conductor 8 Insulation operation rod 9 Wipe spring 10 Wipe spring folder 11 Operation rod 12 Limit switch for closing 13 Limit switch for opening 14 Electromagnetic Actuator 15 Yoke 16 Armature 17 Permanent Magnet 18 Closing Coil 19 Opening Coil 20 Stopper Plate 21 Lower Fixing Member 22 Opening Spring 23 DC Power Supply 24 Closing Command Switch 25 Closing Relay 26 Closing Auxiliary Switch 27 Opening Command Switch 28 Opening Relay 29 Auxiliary switch for open circuit

Claims (4)

A closing coil for closing a pair of contactable and separable contacts and an opening coil for opening;
A closing limit switch that switches from closing to opening when the contact is closed;
An opening limit switch that switches from opening to closing when the contact is closed,
A closing relay for exciting the closing coil when the closing limit switch is closed;
An open relay for exciting the open coil when the open limit switch is closed,
The method for controlling an electromagnetic actuator, wherein the opening limit switch is switched from an open circuit to a closed circuit after the closing switch is switched from a closed circuit to an open circuit.   The open limit switch is switched from open to closed so that the open coil is excited after the closed limit switch is switched from closed to open and the current of the closed coil is interrupted. Item 2. A method for controlling an electromagnetic actuator according to Item 1. Switching from opening to closing of the opening limit switch is before the current of the closing coil is interrupted,
3. The method of controlling an electromagnetic actuator according to claim 1, wherein the operation time is before the open relay operation time. A blocking portion having a pair of contactable contacts;
A closing limit switch that is provided on a movable shaft connected to the blocking portion, and switches from closed to open when the blocking portion is closed; and an opening limit switch that switches from open to closed when the blocking portion is closed;
An operation mechanism unit comprising a closing coil that is excited when the closing limit switch is closed, and an electromagnetic actuator having an opening coil that is excited when the opening limit switch is closed;
The switch is characterized in that after the electromagnetic actuator performs a closing operation and the closing limit switch is switched from closing to opening, the opening limit switch is switched from opening to closing to perform the closing operation.

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