JP2018147642A - Electromagnetic operating device and electromagnetically operated switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change exciting current of an electromagnet coil according to a change of ambient temperature and realize (complete) activating operation normally even when a sensor for measuring the ambient temperature fails.SOLUTION: An electromagnetic operating device according to the present invention includes: an electromagnet coil for forming an electromagnet; a capacitor for storing energy for exciting the electromagnet coil; and a control circuit for connecting the electromagnet coil and the capacitor in accordance with an activating command or an opening command to a switch. The control circuit includes a limiting resistor at the activating operation of the switch, and a short circuiting mechanism provided in parallel with the limiting resistor at the time of the activating operation and short-circuiting the limiting resistance at the activating operation by using a normally-closed contact which is normally "closed" and becomes "open" when a signal is input.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electromagnetic operating device and an electromagnetically operated switchgear, and more particularly, to an electromagnetically operated device and an electromagnetically operated switchgear suitable for operating a switch such as a circuit breaker using electromagnetic force.

  Generally, when operating a switch such as a circuit breaker, an electromagnetic operating device using an electromagnet is used. This electromagnetic operating device includes an electromagnet coil for forming an electromagnet, a capacitor for accumulating energy for exciting the electromagnet coil, and an electromagnet coil and a capacitor for electrical connection in accordance with a switch input command or an opening command. And a control circuit.

  Further, in an electromagnetically operated switch equipped with the above-described electromagnetic actuator, a link mechanism that connects the electromagnetic actuator and the switch is employed.

  In addition, in a switch such as a circuit breaker, a contact pressure spring for applying a contact force to the contact in a closed state and a tripping spring for opening the contact are stored, and in the opening operation, both springs are stored. The contacts are separated using stored energy (see, for example, Patent Document 1).

  In addition, the characteristics of the capacitors and electromagnetic coils constituting the electromagnetic operating device are affected by the ambient temperature. For example, the capacitance of the capacitor increases with increasing temperature. Since the energy stored in the capacitor is proportional to the capacitance of the capacitor, the excitation current of the electromagnetic coil increases as the capacitance increases.

  Moreover, the resistance of the conducting wire constituting the electromagnet coil increases as the temperature rises. When the resistance of the conducting wire increases, the exciting current of the electromagnetic coil decreases.

  Moreover, the permanent magnet used for holding | maintenance of an insertion state falls a residual magnetic flux with a temperature rise. In order to obtain a required charging speed even in a state where the residual magnetic flux is lowered, it is necessary to increase the exciting current of the electromagnetic coil. That is, the necessary electromagnetic force and the generated electromagnetic force vary depending on the ambient temperature.

  In order to perform the closing operation normally at any ambient temperature, it is necessary to design the electromagnetic actuator under conditions that minimize the exciting current of the electromagnetic coil. When the ambient temperature changes and the excitation current of the electromagnet coil increases, the electromagnetic operating device operates at an excessive speed, and the mechanical load on the components constituting the device increases. As a result, effects such as shortening the life of the equipment and excessive design strength occur.

  Therefore, a technique has been proposed in which a resistance that limits the excitation current of the electromagnetic coil is switched according to the ambient temperature, and the electromagnetic force is controlled within a certain range (see, for example, Patent Document 2). This is to maintain an electromagnetic force generated within a certain range by limiting the exciting current of the electromagnetic coil by selecting one resistor from a plurality of limiting resistors according to the ambient temperature.

JP 2005-44612 A JP 2009-176527 A

  However, when one resistor is selected from a plurality of limiting resistors, if a failure occurs in the signal path from the sensor that reads the ambient temperature or from the sensor to the switching device, the switching device operates while connected to one of the limiting resistors. I will not. If the ambient temperature changes in this state, the energizing current of the required electromagnetic coil cannot be applied because the limiting resistance is large, and the closing operation may fail.

  The present invention has been made in view of the above points, and its purpose is to change the excitation current of an electromagnetic coil in accordance with a change in the ambient temperature, and when a sensor for measuring the ambient temperature fails However, it is to provide an electromagnetic operating device and an electromagnetically operated switchgear that can realize (complete) the closing operation normally.

  In order to achieve the above object, an electromagnetic operating device according to the present invention includes an electromagnetic coil for forming an electromagnet, a capacitor for storing energy for exciting the electromagnet coil, and a command for opening or opening a switch. An electromagnetic operating device comprising a control circuit for conducting the electromagnet coil and the capacitor according to a command, wherein the control circuit includes a limiting resistor when the switch is turned on and a limiting resistor when the switch is turned on And a short-circuit mechanism for normally short-circuiting the limiting resistor during the closing operation using a normally-closed contact that is normally “closed” and “opened” when a signal is input. .

  In order to achieve the above object, an electromagnetically operated switchgear according to the present invention connects a switch, an electromagnetic controller for operating the switch, and the electromagnetic controller and the switch via a link mechanism. An electromagnetically operated switchgear provided with a lever for performing the electromagnetic operation, wherein the electromagnetic actuator is an electromagnetic actuator having the above-described configuration.

  According to the present invention, the exciting current of the electromagnetic coil is changed in accordance with the change in the ambient temperature, and even when the sensor for measuring the ambient temperature fails, the closing operation can be realized (completed) normally. it can.

It is a side view which shows the electromagnetic operation type switchgear carrying the Example 1 of the electromagnetic operating device of this invention. It is a control circuit diagram which shows Example 1 of the electromagnetic operating device of this invention. It is a control circuit diagram which shows Example 2 of the electromagnetic operating device of this invention. It is a control circuit diagram which shows Example 3 of the electromagnetic operating device of this invention. It is a control circuit diagram which shows Example 4 of the electromagnetic operating device of this invention.

  Hereinafter, an electromagnetic operating device and an electromagnetically operated switchgear according to the present invention will be described based on the illustrated embodiments. In addition, in each Example, the same code | symbol is used for the same component.

  FIG. 1 shows an electromagnetically operated switchgear equipped with an electromagnetic actuator of Example 1 of the present invention.

  As shown in the figure, an electromagnetically operated switchgear 100 includes a switch (opening / closing unit 15) such as a vacuum circuit breaker, an electromagnetic operating unit 1 for operating the opening / closing unit 15, the electromagnetic operating unit 1 and the opening / closing unit 15. The lever 10 is connected to the first, second and third link mechanisms 7, 9 and 12.

  The electromagnetic operating device 1 is mainly composed of a rod 3 and a movable flat plate 4 connected to a movable iron core 2 that moves up and down in the vertical direction, an electromagnet coil 5, and a permanent magnet 6, and includes a first link mechanism 7 and a connecting component. 8 and connected to the lever 10 via the second link mechanism 9.

  Although not shown, the control circuit is fixed to the right side surface of the case 32 when viewed from the direction of the arrow P in FIG. 1 using a bolt and a nut via a spacer. An exciting current is supplied to the electromagnet coil 5 from this control circuit, and the movable iron core 2 moves up and down. When the rod 3 connected to the movable iron core 2 moves up and down, the lever 10 rotates about the shaft 11, so that the connecting component 13 and the rod 14 connected to the lever 10 via the third link mechanism 12. Ascending and descending, the contact provided in the opening / closing part 15 is contacted / separated (blocked).

  In the closing operation, the contact pressure spring 16 and the release spring 17 are compressed, and elastic energy is accumulated in the contact pressure spring 16 and the release spring 17. The blocking operation is performed by the elastic energy accumulated in the contact pressure spring 16 and the tripping spring 17. When the opening / closing part 15 is in the closing state, the movable iron core 2 and the movable flat plate 4 are held by the attractive force of the permanent magnet 6. By flowing a current in the opposite direction to the closing operation to the electromagnet coil 5, a magnetic flux is generated in a direction to cancel the attractive force of the permanent magnet 6, and the energy accumulated in the contact pressure spring 16 and the tripping spring 17 is released. Thus, the rod 3 is raised, and the opening / closing portion 15 is shut off.

  A first embodiment of a control circuit for driving the electromagnetic operating device 1 of the present embodiment is shown in FIG.

  As shown in the figure, the control circuit of this embodiment includes a capacitor 21, a closing / opening switch 22, a limiting resistor 23 at the closing operation, a limiting resistor 24 at the opening operation, and a closing operation and opening. A first switching relay 25, a second switching relay 26, a third switching relay 27, a fourth switching relay 28, and a state sensor 29 that monitors the state of the ambient temperature, which are switched in conjunction with the operation; The relay 30 is connected in parallel with the limiting resistor 23 at the time of the closing operation and is a short-circuit mechanism that short-circuits the limiting resistor 23 at the time of the closing operation in conjunction with the state sensor 29.

  In the closing operation, as shown by a solid line in FIG. 2, the c contacts of the first switching relay 25, the second switching relay 26, the third switching relay 27, and the fourth switching relay 28 are connected to the a contact, In the opening operation, as shown by a broken line in FIG. 2, the c contacts of the first switching relay 25, the second switching relay 26, the third switching relay 27, and the fourth switching relay 28 are connected to the b contact. ing. Thereby, when the closing and opening switch 22 is turned on, the exciting current flowing in the electromagnet coil 5 in the opening operation and closing operation is reversed.

  The relay 30 is a normally closed contact (usually “closed” and “open” when a signal (power) is input), and is inserted so as to short-circuit the limiting resistor 23 at the time of making operation. That is, when the relay 30 is energized (a signal (power) is input) according to a command from the state sensor 29, the relay 30 is opened.

  The state sensor 29 has, for example, temperature measuring means (thermocouple, thermometer, etc.) for measuring the ambient temperature, and the resistance of the electromagnet coil 5, the residual magnetic flux of the permanent magnet 6, the capacitor 21 according to the ambient temperature. The relay 30 is instructed to open according to the temperature characteristics such as the capacitance of the relay 30.

  In this embodiment configured as described above, the relay 30 is opened when the ambient temperature is in a state of increasing the electromagnetic force during the closing operation. By opening the relay 30, the exciting current of the electromagnet coil 5 is suppressed, and the mechanical load during the closing operation due to excessive electromagnetic force can be reduced.

  In the unlikely event that the state sensor 29 that monitors the ambient temperature fails, no signal (power) is input to the relay 30, so the relay 30 is a normally closed contact point and is "closed". The current limiting resistor 23 is short-circuited. In the state where the limiting resistor 23 during the closing operation is short-circuited, the exciting current of the electromagnet coil 5 becomes the largest, so that the closing operation can be completed in any state within the design range.

  Further, when the signal path is broken, for example, when the cable connecting the relay 30 and the state sensor 29 is disconnected, the relay 30 does not receive a signal (power), so the same state as described above is obtained. Therefore, the exciting current of the electromagnet coil 5 becomes the largest, and the closing operation can be completed in any state within the design range.

  According to the present embodiment, the excitation current of the electromagnet coil 5 is suppressed, the mechanical load during the closing operation due to excessive electromagnetic force can be reduced, and the information on the ambient temperature should be acquired by any chance. Even when the sensor 29 or the signal path fails, the closing operation can be completed normally.

  FIG. 3 shows a second embodiment of a control circuit for driving the electromagnetic operating device 1 of the present invention.

  The control circuit shown in FIG. 3 is a combination n (plural) of limiting resistors 23 and relays 30 at the time of making operation in the control circuit shown in Embodiment 1 of FIG. 2, that is, limiting resistors 231 and relays at the time of making operations. 301, a plurality of pairs of a limiting resistor 232 and a relay 302 through a closing operation to a limiting resistor 23n and a relay 30n during a closing operation are connected in series. Other configurations are the same as those of the first embodiment. Note that the resistance values of the limiting resistors 231 to 23n during the closing operation are arbitrary.

  In the configuration of the present embodiment, n relays 301 to 30n that are n short-circuit mechanisms are independently controlled by the state sensor 29. As a result, the total limiting resistance value can be selected as the sum of the resistances selected from a combination of arbitrary k resistances n or less from the limiting resistances 231 to 23n at the time of the n charging operations. n + 1)-(2 to the nth power) -1) combinations can be realized.

  Therefore, according to the present embodiment, the same effect as in the first embodiment can be obtained, and when n is 2 or more, more resistance values can be realized than when one of n resistors is selected. The resistance value can be changed more continuously.

  FIG. 4 shows a third embodiment of the control circuit for driving the electromagnetic operating device 1 of the present invention.

  The control circuit shown in FIG. 4 excludes the first switching relay 25, the second switching relay 26, the third switching relay 27, and the fourth switching relay 28 in the control circuit shown in the first embodiment of FIG. Further, the closing / opening switch 22 is replaced with a closing switch 31, which is a circuit dedicated to the closing operation.

  By adopting such a configuration of the present embodiment, the same effects as those of the first embodiment can be obtained, and the relay 30 is opened by a command from the state sensor 29, and the excitation current flowing through the electromagnetic coil 5 is limited. It is suppressed by the resistor 23, and the mechanical load of the closing operation due to excessive electromagnetic force can be reduced.

  FIG. 5 shows a fourth embodiment of the control circuit for driving the electromagnetic operating device 1 of the present invention.

  The control circuit shown in FIG. 5 has a configuration in which n pairs (a plurality) of combinations of the limiting resistor 23 and the relay 30 during the closing operation in the control circuit shown in the third embodiment of FIG. 4 are connected in series.

  By adopting such a configuration of the present embodiment, the same effects as those of the first embodiment can be obtained, and, similarly to the second embodiment shown in FIG. 3, when n is 2 or more, n resistors More resistance values can be realized than selecting one from the above, and the resistance values can be changed more continuously.

  The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Electromagnetic actuator, 2 ... Movable iron core, 3, 14 ... Rod, 4 ... Movable flat plate, 5 ... Electromagnetic coil, 6 ... Permanent magnet, 7 ... 1st link mechanism, 8, 13 ... Connection component, 9 ... 1st 2 link mechanism, 10 ... lever, 11 ... shaft, 12 ... third link mechanism, 15 ... opening / closing part, 16 ... contact pressure spring, 17 ... tripping spring, 21 ... capacitor, 22 ... closing and opening switch, 23, 231 to 23n: Limiting resistor at the time of closing operation, 24 ... Limiting resistor at the time of opening operation, 25 ... First switching relay, 26 ... Second switching relay, 27 ... Third switching relay, 28 ... First 4 switching relays, 29 ... state sensors, 30, 301 to 30n ... relays, 31 ... closing switch, 32 ... case, 100 ... electromagnetically operated switchgear.

Claims (8)

An electromagnet coil for forming an electromagnet, a capacitor for accumulating energy for exciting the electromagnet coil, and a control circuit for conducting the electromagnet coil and the capacitor in accordance with a switch input command or an opening command An electromagnetic operating device comprising:
The control circuit is provided in parallel with a limiting resistor at the time of closing operation of the switch and a limiting resistor at the time of closing operation, and normally has a normally closed contact that is “closed” and “open” when a signal is input And a short-circuit mechanism for short-circuiting the limiting resistance during the closing operation. The electromagnetic actuator according to claim 1,
The control circuit is provided in parallel with a capacitor, a closing switch of the switch, a limiting resistor at the time of switching on the switch, a state sensor for monitoring an ambient temperature state, and a limiting resistor at the time of the closing operation. And a relay that short-circuits the limiting resistor during the closing operation using a normally closed contact that is normally “closed” and is “open” when a signal is input, in conjunction with the state sensor. An electromagnetic actuator characterized by that. The electromagnetic actuator according to claim 2.
A plurality of combinations of the limiting resistor at the time of the closing operation and the relay are connected in series, and each combination of the limiting resistor at the time of the closing operation and the relay is connected to the state sensor. An electromagnetic operating device. The electromagnetic actuator according to claim 1,
The control circuit includes a capacitor, a switch opening and opening switch, a limiting resistor during the opening operation of the switch, a limiting resistor during the opening operation of the switch, and a switching operation of the switch And a plurality of switching relays that are switched in conjunction with the opening operation, a state sensor that monitors the state of the ambient temperature, and a limiting resistor at the time of the closing operation are provided in parallel with the state sensor. An electromagnetic operating device comprising: a relay that is “closed” and that uses a normally closed contact that is “open” when a signal is input to short-circuit the limiting resistor during the closing operation. The electromagnetic actuator according to claim 4,
A plurality of combinations of the limiting resistor at the time of the closing operation and the relay are connected in series, and each combination of the limiting resistor at the time of the closing operation and the relay is connected to the state sensor. An electromagnetic operating device. In the electromagnetic actuator according to claim 4 or 5,
The electromagnetic sensor according to claim 1, wherein the state sensor has temperature measuring means for measuring an ambient temperature, and the relay is instructed to open according to the ambient temperature detected by the temperature measuring means. The electromagnetic actuator according to claim 6,
The relay is instructed to open according to a temperature characteristic of a resistance of the electromagnetic coil according to an ambient temperature or a capacitance characteristic of the capacitor. An electromagnetically operated switchgear comprising a switch, an electromagnetic operating device for operating the switch, and a lever for connecting the electromagnetic operating device and the switch via a link mechanism,
The electromagnetic operating switch according to any one of claims 1 to 7, wherein the electromagnetic operating device is an electromagnetic operating switchgear.

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