EP3370244B1 - Electromagnetic operation device and electromagnetic operation-type switching apparatus - Google Patents
Electromagnetic operation device and electromagnetic operation-type switching apparatus Download PDFInfo
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- EP3370244B1 EP3370244B1 EP18154510.4A EP18154510A EP3370244B1 EP 3370244 B1 EP3370244 B1 EP 3370244B1 EP 18154510 A EP18154510 A EP 18154510A EP 3370244 B1 EP3370244 B1 EP 3370244B1
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- electromagnetic
- electromagnetic operation
- operation device
- switching
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- 239000003990 capacitor Substances 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000005284 excitation Effects 0.000 description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
- H01H47/26—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil having thermo-sensitive input
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/32—Electromagnetic mechanisms having permanently magnetised part
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/28—Power arrangements internal to the switch for operating the driving mechanism using electromagnet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/66—Power reset mechanisms
- H01H71/68—Power reset mechanisms actuated by electromagnet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/0062—Testing or measuring non-electrical properties of switches, e.g. contact velocity
- H01H2011/0068—Testing or measuring non-electrical properties of switches, e.g. contact velocity measuring the temperature of the switch or parts thereof
Definitions
- the present invention relates to an electromagnetic operation device and an electromagnetic operation-type switching apparatus and, more particularly, to an electromagnetic operation device and an electromagnetic operation-type switching apparatus which are suitable for operating a switching device, such as a circuit breaker, by using electromagnetic force.
- an electromagnetic operation device that employs an electromagnet is used.
- This electromagnetic operation device is generally composed of an electromagnet coil for forming the electromagnet, a capacitor accumulating energy for exciting the electromagnet coil, and a control circuit for causing the electromagnet coil and the capacitor to be electrically conducted according to a turn-on command or turn-off command to the switching device.
- a contact pressure spring for applying contact force to a contact point in a turn-on state and a tripping spring for turning off the contact point are subjected to energy accumulation and the contact point is opened by using the accumulated energies of the both springs in a turn-off operation (for example, refer to Patent Document 1).
- the capacitor and the electromagnet coil which constitute the electromagnetic operation device are affected by ambient temperature to change their characteristics. For example, the electrostatic capacity of the capacitor is increased in response to a temperature increase. Since the energy that is accumulated in the capacitor is proportional to the electrostatic capacity of the capacitor, if the electrostatic capacity is increased, the excitation current of the electromagnet coil is increased.
- the resistance of a conducting wire constituting the electromagnet coil is increased in response to a temperature increase. If the resistance of the conducting wire is increased, the excitation current of the electromagnet coil is reduced.
- a permanent magnet that is used for retaining the turn-on state is reduced in residual magnetic flux in response to a temperature increase.
- the excitation current of the electromagnet coil is required to be increased. That is, a required electromagnetic force and a generated electromagnetic force are changed according to ambient temperature.
- the electromagnetic operation device In order that turn-on operation is normally carried out even in any ambient temperature, the electromagnetic operation device is required to be designed on condition that the excitation current of the electromagnet coil is minimized. When the ambient temperature is changed and the excitation current of the electromagnet coil is increased, the electromagnetic operation device is operated at an excessive speed, and mechanical loads to components constituting equipment are increased. As a result, adverse effects of shortening the service life of the equipment and exceeding the design strength of the equipment occur.
- resistors for limiting the excitation current of the electromagnet coil are switched according to ambient temperature and an electromagnetic force is controlled within a specified range (for example, Patent Document 2). This is to maintain the electromagnetic force, generated by limiting the excitation current of the electromagnet coil, within a certain range by selecting one resistor from a plurality of existing limiting-resistors according to the ambient temperature.
- US 5 784 244 A discloses a device with the features in the preamble of present claim 1. Another conventional electromagnetic operation device is described in US 2015/206676 A1 .
- the switching device when one resistor is selected from the plurality of existing limiting-resistors and when a sensor reading the ambient temperature and a signal path from the sensor to a switching device fail, the switching device is in a state of connecting to any limiting resistors and does not operate. In this state, when the ambient temperature changes, the excitation current of the required electromagnet coil cannot be made to flow since the limiting resistors are large, and there is a probability that the turn-on operation will fail.
- the present invention has been made in view of the foregoing, and its object is to provide an electromagnetic operation device and an electromagnetic operation-type switching apparatus which change an excitation current of an electromagnet coil in response to a change in ambient temperature and, even if a sensor that measures the ambient temperature fails, can normally realize (complete) a turn-on operation.
- an electromagnetic operation device of the present invention has the features defined in claim 1.
- the excitation current of the electromagnet coil is changed in response to a change in ambient temperature and, even if a sensor that measures the ambient temperature fails, the turn-on operation can be normally realized (completed).
- FIG. 1 is a side view showing an electromagnetic operation-type switching apparatus which is equipped with an electromagnetic operation device of a first embodiment according to one embodiment of the present invention.
- the electromagnetic operation-type switching apparatus 100 is generally composed of a switching device (a switching portion 15) such as a vacuum circuit breaker, an electromagnetic operation device 1 operating the switching portion 15, and a lever 10 connecting the electromagnetic operation device 1 and the switching portion 15 via a first link mechanism 7, a second link mechanism 9, and a third link mechanism 12.
- a switching device such as a vacuum circuit breaker
- an electromagnetic operation device 1 operating the switching portion 15 and a lever 10 connecting the electromagnetic operation device 1 and the switching portion 15 via a first link mechanism 7, a second link mechanism 9, and a third link mechanism 12.
- the electromagnetic operation device 1 is generally composed of a rod 3 and a movable flat plate 4, which are connected to a movable iron core 2 vertically moving up and down, an electromagnet coil 5, and a permanent magnet 6, and is connected to the lever 10 via the first link mechanism 7, a connection component 8, and the second link mechanism 9.
- a control circuit is fixed to a right side surface of a case 32, when viewed from a direction of an arrow P in Fig. 1 , by using a bolt and a nut through a spacer. Excitation current is supplied to the electromagnet coil 5 from this control circuit and the movable iron core 2 then moves up and down.
- the lever 10 rotates about a shaft 11, whereby a connection component 13 and a rod 14 that are coupled to the lever 10 through the third link mechanism 12 move up and down and a contact point provided in the switching portion 15 separates (breaks down).
- FIG. 2 is a circuit diagram of a control circuit for driving the electromagnetic operation device 1 shown in FIG. 1 .
- the control circuit of this embodiment for controlling connection of the electromagnet coil 5 to a capacitor 21 is composed of an on-off switch 22, a limiting resistor 23 for limiting electric current at the time of turn-on operation, a limiting resistor 24 for limiting electric current at the time of turn-off operation, a first switching relay 25 that is switched in conjunction with the turn-on operation and the turn-off operation, a second switching relay 26, a third switching relay 27, a fourth switching relay 28, a state sensor 29 monitoring an ambient temperature state, and a relay 30 that is a short-circuiting mechanism connected in parallel with the limiting resistor 23 at the time of turn-on operation and interlocking the state sensor 29 to short-circuit the limiting resistor 23 at the time of turn-on operation.
- contact points c of the first switching relay 25, second switching relay 26, third switching relay 27, and fourth switching relay 28 connect to contact points a and, in the turn-off operation, as shown by broken lines in Fig. 2 , the contact points c of the first switching relay 25, second switching relay 26, third switching relay 27, and fourth switching relay 28 connect to contact points b.
- the relay 30 is a normally-closed contact point (normally “closed” and, when a signal (power) is inputted, “opened") and inserted in such a manner to short-circuit the limiting resistor 23 at the time of turn-on operation. That is, when the relay 30 is electrically conducted by a command from the state sensor 29 (when the signal (power) is inputted), the relay 30 becomes an off-state.
- the state sensor 29 includes, for example, a temperature measuring means (a thermocouple, a thermometer, etc.) measuring ambient temperature, and directs opening of the relay 30 according to the resistance of the electromagnet coil 5 that corresponds to ambient temperature, the residual magnetic flux of the permanent magnet 6, and a temperature characteristic such as the electrostatic capacity of the capacitor 21.
- a temperature measuring means a thermocouple, a thermometer, etc.
- the relay 30 when the ambient temperature becomes a state in which it increases electromagnetic force at the time of turn-on operation, the relay 30 is opened.
- the excitation current of the electromagnet coil 5 is restricted, and a mechanical load at the time of turn-on operation by excessive electromagnetic force can be reduced.
- a signal path fails, for example, when a cable that connects the relay 30 and the state sensor 29 is broken, the signal (power) is not inputted to the relay 30 as well, so that the same state as described above occurs, so that the excitation current of the electromagnet coil 5 becomes the largest and the turn-on operation can be completed even in any state within the design range.
- the excitation current of the electromagnet coil 5 is restricted, the mechanical load at the time of turn-on operation by the excessive electromagnetic force can be reduced and, even if by any chance the state sensor 29 that obtains information of the ambient temperature, or the signal path fails, the turn-on operation can be normally completed.
- FIG. 3 is a circuit diagram of a control circuit for driving an electromagnetic operation device of a second embodiment according to another embodiment of the present invention.
- the control circuit shown in Fig. 3 is configured to have a structure in which n pairs (a plurality) of combinations of the limiting resistor 23 at the time of turn-on operation and the relay 30 in the control circuit shown in the first embodiment of Fig. 2 , that is, plural pairs of limiting resistors 231 at the time of turn-on operation and relays 301, and plural pairs of limiting resistors 232 at the time of turn-on operation and relays 302-plural pairs of limiting resistors 23n and relays 30n are connected in series.
- the other configurations are the same as described in the first embodiment.
- resistance values of the limiting resistors 231 to 23n are arbitrary.
- the relays 301 to 30n that are the n short-circuiting mechanisms are independently controlled by the state sensor 29.
- a total limiting resistance value can be selected as a sum of resistances selected with a combination of arbitrary k resistors equal to or less than n among the n limiting resistors 231 to 23n at the time of turn-on operation, so that a combination according to ((2 n+1 )-(2 n )-1) can be realized.
- FIG. 4 is a circuit diagram of a control circuit for driving an electromagnetic operation device of a third embodiment according to still another embodiment of the present invention.
- the control circuit shown in FIG. 4 is configured to have a structure in which 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. 2 are excluded, or the on-off switch 22 is replaced with a turn-on switch 31, and is a circuit exclusive for turn-on operation.
- FIG. 5 is a circuit diagram of a control circuit for driving an electromagnetic operation device of a fourth embodiment according to still yet another embodiment of the present invention.
- the control circuit shown in Fig. 5 is configured to have a structure in which n pairs (plurality) of combinations of the limiting resistors 23 at the time of turn-on operation and the relays 30 in the control circuit shown in the third embodiment of Fig. 4 are connected in series.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Electromagnets (AREA)
- Relay Circuits (AREA)
- Keying Circuit Devices (AREA)
Description
- The present invention relates to an electromagnetic operation device and an electromagnetic operation-type switching apparatus and, more particularly, to an electromagnetic operation device and an electromagnetic operation-type switching apparatus which are suitable for operating a switching device, such as a circuit breaker, by using electromagnetic force.
- In general, when a switching device such as a circuit breaker is operated, an electromagnetic operation device that employs an electromagnet is used. This electromagnetic operation device is generally composed of an electromagnet coil for forming the electromagnet, a capacitor accumulating energy for exciting the electromagnet coil, and a control circuit for causing the electromagnet coil and the capacitor to be electrically conducted according to a turn-on command or turn-off command to the switching device.
- Further, in an electromagnetic operation-type switching apparatus which is equipped with the above-mentioned electromagnetic operation device, a link mechanism which couples the electromagnetic operation device and the switching device is employed.
- Further, in the switching device such as the circuit breaker, a contact pressure spring for applying contact force to a contact point in a turn-on state and a tripping spring for turning off the contact point are subjected to energy accumulation and the contact point is opened by using the accumulated energies of the both springs in a turn-off operation (for example, refer to Patent Document 1).
- Further, the capacitor and the electromagnet coil which constitute the electromagnetic operation device are affected by ambient temperature to change their characteristics. For example, the electrostatic capacity of the capacitor is increased in response to a temperature increase. Since the energy that is accumulated in the capacitor is proportional to the electrostatic capacity of the capacitor, if the electrostatic capacity is increased, the excitation current of the electromagnet coil is increased.
- Further, the resistance of a conducting wire constituting the electromagnet coil is increased in response to a temperature increase. If the resistance of the conducting wire is increased, the excitation current of the electromagnet coil is reduced.
- Further, a permanent magnet that is used for retaining the turn-on state is reduced in residual magnetic flux in response to a temperature increase. In order to obtain a required turn-on speed even in a state where the residual magnetic flux is reduced, the excitation current of the electromagnet coil is required to be increased. That is, a required electromagnetic force and a generated electromagnetic force are changed according to ambient temperature.
- In order that turn-on operation is normally carried out even in any ambient temperature, the electromagnetic operation device is required to be designed on condition that the excitation current of the electromagnet coil is minimized. When the ambient temperature is changed and the excitation current of the electromagnet coil is increased, the electromagnetic operation device is operated at an excessive speed, and mechanical loads to components constituting equipment are increased. As a result, adverse effects of shortening the service life of the equipment and exceeding the design strength of the equipment occur.
- Accordingly, a technology has been proposed in which resistors for limiting the excitation current of the electromagnet coil are switched according to ambient temperature and an electromagnetic force is controlled within a specified range (for example, Patent Document 2). This is to maintain the electromagnetic force, generated by limiting the excitation current of the electromagnet coil, within a certain range by selecting one resistor from a plurality of existing limiting-resistors according to the ambient temperature.
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- Patent Document 1:
JP2005-44612A - Patent Document 2:
JP2009-176527A JP 4934065 B2 -
US 5 784 244 A discloses a device with the features in the preamble of present claim 1. Another conventional electromagnetic operation device is described inUS 2015/206676 A1 . - However, when one resistor is selected from the plurality of existing limiting-resistors and when a sensor reading the ambient temperature and a signal path from the sensor to a switching device fail, the switching device is in a state of connecting to any limiting resistors and does not operate. In this state, when the ambient temperature changes, the excitation current of the required electromagnet coil cannot be made to flow since the limiting resistors are large, and there is a probability that the turn-on operation will fail.
- The present invention has been made in view of the foregoing, and its object is to provide an electromagnetic operation device and an electromagnetic operation-type switching apparatus which change an excitation current of an electromagnet coil in response to a change in ambient temperature and, even if a sensor that measures the ambient temperature fails, can normally realize (complete) a turn-on operation.
- To address the above-mentioned object, an electromagnetic operation device of the present invention has the features defined in claim 1.
- In accordance with the present invention, the excitation current of the electromagnet coil is changed in response to a change in ambient temperature and, even if a sensor that measures the ambient temperature fails, the turn-on operation can be normally realized (completed).
- The dependent claims relate to preferred embodiments.
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FIG. 1 is a side view showing an electromagnetic operation-type switching apparatus which is equipped with an electromagnetic operation device of a first embodiment according to one embodiment of the present invention. -
FIG. 2 is a circuit diagram of a control circuit for driving the electromagnetic operation device shown inFig. 1 . -
FIG. 3 is a circuit diagram of a control circuit for driving an electromagnetic operation device of a second embodiment according to another embodiment of the present invention. -
FIG. 4 is a circuit diagram of a control circuit for driving an electromagnetic operation device of a third embodiment according to still another embodiment of the present invention. -
FIG. 5 is a circuit diagram of a control circuit for driving an electromagnetic operation device of a fourth embodiment according to yet still another embodiment of the present invention. - An electromagnetic operation device and electromagnetic operation-type switching apparatus of the present invention will be explained hereinafter based on illustrated embodiments. Incidentally, in each embodiment, like components are labelled by like reference signs.
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FIG. 1 is a side view showing an electromagnetic operation-type switching apparatus which is equipped with an electromagnetic operation device of a first embodiment according to one embodiment of the present invention. - As shown in
Fig. 1 , the electromagnetic operation-type switching apparatus 100 is generally composed of a switching device (a switching portion 15) such as a vacuum circuit breaker, an electromagnetic operation device 1 operating theswitching portion 15, and alever 10 connecting the electromagnetic operation device 1 and theswitching portion 15 via afirst link mechanism 7, asecond link mechanism 9, and athird link mechanism 12. - The electromagnetic operation device 1 is generally composed of a rod 3 and a movable
flat plate 4, which are connected to amovable iron core 2 vertically moving up and down, anelectromagnet coil 5, and apermanent magnet 6, and is connected to thelever 10 via thefirst link mechanism 7, aconnection component 8, and thesecond link mechanism 9. - Further, though unshown, a control circuit is fixed to a right side surface of a
case 32, when viewed from a direction of an arrow P inFig. 1 , by using a bolt and a nut through a spacer. Excitation current is supplied to theelectromagnet coil 5 from this control circuit and themovable iron core 2 then moves up and down. When the rod 3 coupled to themovable iron coil 2 moves up and down, thelever 10 rotates about ashaft 11, whereby aconnection component 13 and arod 14 that are coupled to thelever 10 through thethird link mechanism 12 move up and down and a contact point provided in theswitching portion 15 separates (breaks down). - In turn-on operation, a
contact pressure spring 16 and a trippingspring 17 are compressed, and elastic energy is accumulated in thecontact pressure spring 16 and thetripping spring 17. By this elastic energy that is accumulated in thecontact pressure spring 16 and the trippingspring 17, break-down operation is performed.
When theswitching portion 15 is in a turn-on state, themovable iron coil 2 and the movableflat plate 4 are retained by the magnetic attraction force of thepermanent magnet 6. By passing electric current through theelectromagnet coil 5 in an opposite direction from the turn-on operation, magnetic flux is generated in a direction of canceling the magnetic attraction force of thepermanent magnet 6 and, by releasing the energy accumulated in thecontact pressure spring 16 and the trippingspring 17, the rod 3 moves upward and the break-down operation of theswitching portion 15 is performed. -
FIG. 2 is a circuit diagram of a control circuit for driving the electromagnetic operation device 1 shown inFIG. 1 . - As shown in
FIG. 2 , the control circuit of this embodiment for controlling connection of theelectromagnet coil 5 to acapacitor 21 is composed of an on-off switch 22, alimiting resistor 23 for limiting electric current at the time of turn-on operation, a limitingresistor 24 for limiting electric current at the time of turn-off operation, afirst switching relay 25 that is switched in conjunction with the turn-on operation and the turn-off operation, asecond switching relay 26, athird switching relay 27, afourth switching relay 28, astate sensor 29 monitoring an ambient temperature state, and arelay 30 that is a short-circuiting mechanism connected in parallel with the limitingresistor 23 at the time of turn-on operation and interlocking thestate sensor 29 to short-circuit the limitingresistor 23 at the time of turn-on operation. - In the turn-on operation, as shown by solid lines in
Fig. 2 , contact points c of thefirst switching relay 25,second switching relay 26,third switching relay 27, andfourth switching relay 28 connect to contact points a and, in the turn-off operation, as shown by broken lines inFig. 2 , the contact points c of thefirst switching relay 25,second switching relay 26,third switching relay 27, andfourth switching relay 28 connect to contact points b. Thereby, when the on-off switch 22 turns on electricity, excitation current flowing through theelectromagnet coil 5 with the turn-off operation and the turn-on operation is reversed. - Further, the
relay 30 is a normally-closed contact point (normally "closed" and, when a signal (power) is inputted, "opened") and inserted in such a manner to short-circuit the limitingresistor 23 at the time of turn-on operation. That is, when therelay 30 is electrically conducted by a command from the state sensor 29 (when the signal (power) is inputted), therelay 30 becomes an off-state. - Further, the
state sensor 29 includes, for example, a temperature measuring means (a thermocouple, a thermometer, etc.) measuring ambient temperature, and directs opening of therelay 30 according to the resistance of theelectromagnet coil 5 that corresponds to ambient temperature, the residual magnetic flux of thepermanent magnet 6, and a temperature characteristic such as the electrostatic capacity of thecapacitor 21. - In this embodiment configured in this way, when the ambient temperature becomes a state in which it increases electromagnetic force at the time of turn-on operation, the
relay 30 is opened. By the opening of therelay 30, the excitation current of theelectromagnet coil 5 is restricted, and a mechanical load at the time of turn-on operation by excessive electromagnetic force can be reduced. - If by any chance the
state sensor 29 that monitors the ambient temperature fails, a signal (power) is not inputted to therelay 30, so that therelay 30 is "closed" since it is the normally-closed contact point, and the limitingresistor 23 at the time of turn-on operation is brought into a short-circuited state. In the state in which thelimiting resistor 23 is short-circuited, the excitation current of theelectromagnet coil 5 becomes the largest, so that the turn-on operation can be completed even in any state within a design range. - Further, when a signal path fails, for example, when a cable that connects the
relay 30 and thestate sensor 29 is broken, the signal (power) is not inputted to therelay 30 as well, so that the same state as described above occurs, so that the excitation current of theelectromagnet coil 5 becomes the largest and the turn-on operation can be completed even in any state within the design range. - According to such embodiment, the excitation current of the
electromagnet coil 5 is restricted, the mechanical load at the time of turn-on operation by the excessive electromagnetic force can be reduced and, even if by any chance thestate sensor 29 that obtains information of the ambient temperature, or the signal path fails, the turn-on operation can be normally completed. -
FIG. 3 is a circuit diagram of a control circuit for driving an electromagnetic operation device of a second embodiment according to another embodiment of the present invention. - The control circuit shown in
Fig. 3 is configured to have a structure in which n pairs (a plurality) of combinations of the limitingresistor 23 at the time of turn-on operation and therelay 30 in the control circuit shown in the first embodiment ofFig. 2 , that is, plural pairs of limitingresistors 231 at the time of turn-on operation and relays 301, and plural pairs of limitingresistors 232 at the time of turn-on operation and relays 302-plural pairs of limitingresistors 23n and relays 30n are connected in series. The other configurations are the same as described in the first embodiment. Incidentally, resistance values of the limitingresistors 231 to 23n are arbitrary. - In such configuration of this embodiment, the
relays 301 to 30n that are the n short-circuiting mechanisms are independently controlled by thestate sensor 29. Thereby, a total limiting resistance value can be selected as a sum of resistances selected with a combination of arbitrary k resistors equal to or less than n among then limiting resistors 231 to 23n at the time of turn-on operation, so that a combination according to ((2n+1)-(2n)-1) can be realized. - Therefore, according to this embodiment, it is possible not only to obtain the same effects as those in the first embodiment but also to realize resistance values more than the case where one resistor is selected from the n resistors in the case where n is equal to or more than 2, and it is possible to change the resistance values more continuously.
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FIG. 4 is a circuit diagram of a control circuit for driving an electromagnetic operation device of a third embodiment according to still another embodiment of the present invention. - The control circuit shown in
FIG. 4 is configured to have a structure in which thefirst switching relay 25, thesecond switching relay 26, thethird switching relay 27, and thefourth switching relay 28 in the control circuit shown in the first embodiment ofFig. 2 are excluded, or the on-off switch 22 is replaced with a turn-onswitch 31, and is a circuit exclusive for turn-on operation. - By employing such configuration of this embodiment, not only the same effects as those in the first embodiment are obtained but also the
relay 30 becomes the off-state according to the command from the state sensor, and the excitation current flowing through theelectromagnet coil 5 is restricted by the limitingresistor 23, and the mechanical load at the time of the turn-on operation by the excessive electromagnetic force can be reduced. -
FIG. 5 is a circuit diagram of a control circuit for driving an electromagnetic operation device of a fourth embodiment according to still yet another embodiment of the present invention. - The control circuit shown in
Fig. 5 is configured to have a structure in which n pairs (plurality) of combinations of the limitingresistors 23 at the time of turn-on operation and therelays 30 in the control circuit shown in the third embodiment ofFig. 4 are connected in series. - By employing such configuration of this embodiment, it is possible not only to obtain the same effects as those in the first embodiment but also to realize resistance values more than the case where one resistor is selected from the n resistors in the case where n is equal to or more than 2, as with the second embodiment shown in
FIG. 3 , and it is possible to change the resistance values more continuously. - Incidentally, the embodiments mentioned above have been explained in details for the purpose of explaining the present invention easily, but they are not necessarily limited to those having all the structures. Also, a portion of a structure of a certain embodiment can be replaced by a structure of another embodiment, and a structure of a certain embodiment can be also added to a structure of another embodiment. Further, addition, deletion, or replacement of other structures can be carried out for portions of structures of the respective embodiments.
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- 1···Electromagnetic operation device
- 2···Movable iron core
- 3, 14···Rod
- 4···Movable flat plate
- 5···Electromagnet coil
- 6···Permanent magnet
- 7···First link mechanism
- 8, 13···Connection component
- 9···Second link mechanism
- 10···Lever
- 11···Shaft
- 12···Third link mechanism
- 15···Switching portion
- 16···Contact pressure spring
- 17···Tripping spring
- 21···Capacitor
- 22···On-off switch
- 23, 231 to 23n···Limiting resistor at the time of turn-on operation
- 24···Limiting resistor at the time of turn-off operation
- 25···First switching relay
- 26···Second switching relay
- 27···Third switching relay
- 28···Fourth switching relay
- 29···State sensor
- 30, 301 to 30n···Relay
- 31···Turn-on switch
- 32···Case
- 100···Electromagnetic operation-type switching apparatus
Claims (5)
- An electromagnetic operation device (1) comprising:an electromagnet coil (5) for forming an electromagnet;a capacitor (21) accumulating energy for exciting the electromagnet coil (5); anda control circuit for causing the electromagnet coil (5) and the capacitor (21) to be electrically connected according to a turn-on command or a turn-off command to a switching device (15), wherein the control circuit comprises a limiting resistor (23) at the time of turn-on operation of the switching device (15),characterized in that the control circuit further comprisesa state sensor (29) monitoring an ambient temperature state, and a relay (30) that is provided in parallel with the limiting resistor (23) at the time of turn-on operation and short-circuits the limiting resistor (23) at the time of turn-on operation by using a normally-closed contact point that is normally "closed" and is "opened" when a signal is inputted from the state sensor (29), andeither a turn-on switch (31), oran on-off switch (22), a resistor (24) at the time of turn-off operation of the switching device (15), and a plurality of switching relays (25, 26, 27, 28) that are switched in conjunction with the turn-on operation and turn-off operation of the switching device (15).
- The electromagnetic operation device (1) according to claim 1, characterized in that a plurality of combinations of said limiting resistors (231 to 23n) at the time of turn-on operation and said relays (301 to 30n) are connected in series, each of the combinations of limiting resistors (231 to 23n) at the time of turn-on operation and relays (301 to 30n) being connected to the state sensor (29).
- The electromagnetic operation device (1) according to claim 1 or 2, characterized in that the state sensor (29) comprises a temperature measuring means that measures ambient temperature, and opening of the relays (30, 301-30n) is directed according to the ambient temperature that is detected by the temperature measuring means.
- The electromagnetic operation device (1) according to claim 3, characterized in that the relays (30, 301 to 30n) are directed to be opened according to resistance of the electromagnet coil (5), that corresponds to the ambient temperature, or temperature characteristic of electrostatic capacity of the capacitor (21).
- An electromagnetic operation-type switching apparatus (100) comprising:a switching device (15);an electromagnetic operation device (1) operating the switching device (15); anda lever (10) connecting the electromagnetic operation device (1) and the switching device (15) via link mechanisms (7, 9, 12),the electromagnetic operation device (1) being the electromagnetic operation device (1) according to any one of claims 1 to 4.
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JP2017040225A JP2018147642A (en) | 2017-03-03 | 2017-03-03 | Electromagnetic operating device and electromagnetically operated switching device |
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EP3370244A1 EP3370244A1 (en) | 2018-09-05 |
EP3370244B1 true EP3370244B1 (en) | 2019-07-10 |
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EP18154510.4A Active EP3370244B1 (en) | 2017-03-03 | 2018-01-31 | Electromagnetic operation device and electromagnetic operation-type switching apparatus |
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EP (1) | EP3370244B1 (en) |
JP (1) | JP2018147642A (en) |
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JP7248421B2 (en) * | 2018-12-25 | 2023-03-29 | 株式会社日立産機システム | Vacuum circuit breaker system and vacuum circuit breaker abnormality diagnosis method |
CN111739746B (en) * | 2020-07-10 | 2024-01-23 | 安徽一天电气技术股份有限公司 | Switch |
CN112490066B (en) * | 2020-07-10 | 2023-03-10 | 安徽一天电气技术股份有限公司 | Switch |
KR102550204B1 (en) * | 2020-09-22 | 2023-06-30 | 주식회사 유라코퍼레이션 | Device and method of detecting welding of high voltage relay for vehicle |
CN113937727A (en) * | 2021-10-20 | 2022-01-14 | 傲普(上海)新能源有限公司 | Relay integrated circuit with pre-charging and short-circuit protection functions |
WO2023119453A1 (en) * | 2021-12-21 | 2023-06-29 | 株式会社日立産機システム | Switch |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
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US5784244A (en) * | 1996-09-13 | 1998-07-21 | Cooper Industries, Inc. | Current limiting circuit |
JP4269156B2 (en) | 2003-07-28 | 2009-05-27 | 株式会社日立製作所 | Electromagnetic operation method and electromagnetic operation device |
JP4358698B2 (en) * | 2004-07-23 | 2009-11-04 | 株式会社日立製作所 | Electromagnetic operation device |
JP4934065B2 (en) | 2008-01-23 | 2012-05-16 | 三菱電機株式会社 | Electromagnetic switchgear |
JP5617759B2 (en) * | 2011-05-12 | 2014-11-05 | 三菱電機株式会社 | Electromagnetic vacuum breaker |
JP5680205B2 (en) * | 2011-08-29 | 2015-03-04 | 三菱電機株式会社 | Vacuum breaker electromagnetic operation device |
JP5948176B2 (en) * | 2012-07-24 | 2016-07-06 | 株式会社日立製作所 | Switch |
JP5734529B2 (en) * | 2013-03-13 | 2015-06-17 | 三菱電機株式会社 | Electromagnetic operation device |
CN203631410U (en) * | 2013-12-30 | 2014-06-04 | 成都科星电力电器有限公司 | Vacuum circuit breaker controlling circuit and vacuum circuit breaker controlling system |
CN104658778A (en) * | 2015-02-26 | 2015-05-27 | 国网浙江省电力公司电力科学研究院 | Energy storage and triggering equipment for electromagnetic repulsion operating mechanism and control method |
-
2017
- 2017-03-03 JP JP2017040225A patent/JP2018147642A/en active Pending
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2018
- 2018-01-31 EP EP18154510.4A patent/EP3370244B1/en active Active
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CN108538685B (en) | 2019-08-13 |
CN108538685A (en) | 2018-09-14 |
EP3370244A1 (en) | 2018-09-05 |
JP2018147642A (en) | 2018-09-20 |
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