Patent Application
20140226250
This invention relates to “an electromagnetic operation device for a vacuum circuit breaker” that controls a contact-switching operation of a vacuum switch tube used in the vacuum circuit breaker, by means of a driving force using electromagnetic force, and in more particular, relates to an electromagnetic operation device for a vacuum circuit breaker that can suppress change in speed of the contact switching operation, even if a temperature change occurs in a drive coil and/or a drive capacitor constituting the electromagnetic operation device.
Using
A vacuum switch tube (called also as a vacuum valve) 50 constituting the vacuum circuit breaker has a switching contact 51 accommodated in a vacuum vessel. The switching contact 51 is composed of a fixed contact 51a and a movable contact 51b, and in the contact open state, the fixed contact 51a and the movable contact 51b are placed opposite to each other with a given space therebetween.
To the movable contact 51b, a driving shaft 52 is fixed, so that the movable contact 51b and the driving shaft 52 constitute a movable section. The movable section is coupled to a movable core 61 in an electromagnetic operation mechanism 60 through a contact pressure spring and a spring seat 54.
The electromagnetic operation mechanism 60 has a movable core 61, a closing drive coil 62 and an opening drive coil 63.
The closing drive coil 62 serves to drive the movable contact 51b to thereby achieve the contact closed state, and the opening drive coil 63 serves to drive the movable contact 51b to thereby achieve the contact open state.
The closing drive coil 62 and the opening drive coil as driving magnetic coils are arranged in axial direction of the movable core 61 with a given distance therebetween. The movable core 61 is disposed centrally in the closing drive coil 62 and the opening drive coil 63, and movably in its axial direction.
A driving power supply unit 70 has a closing drive capacitor 71, an opening drive capacitor 72, a close command switch 73 and an open command switch 74.
When the close command switch 73 is turned on, a voltage charged in the closing drive capacitor 71 is applied to the closing drive coil 62, so that a current flows through the closing drive coil 62 to thereby cause a drive toward the contact closed state. Meanwhile, when the open command switch 74 is turned on, a voltage charged in the opening drive capacitor 72 is applied to the opening drive coil 63, so that a current flows through the opening drive coil 63 to thereby cause a drive toward the contact open state.
Note that, in
A status recognition device disclosed in the above Patent Document 1, is to be equipped in the electromagnetic operation device which comprises a fixed core, a movable core configured movably with respect to the fixed core, and a magnetic coil that causes to move the movable core being magnetically excited by a driving power supply, to thereby drive an operational target instrument (vacuum switch tube) being coupled to the movable core, wherein the status recognition device includes a measuring means for measuring a current flowing through the magnetic coil or a voltage generated in the magnetic coil, and an exploring means for acquiring information about a change in a waveform outputted from the measuring means, to thereby estimate a status of the operational target instrument or the electromagnetic operation device on the basis of the information about the change from the exploring means.
In Patent Document 1, however, there is no description as to “occurrence of change in speed of the contact switching operation, due to a change in current flowing through the magnetic coil” that is caused by a temperature change of the magnetic coil (the opening drive coil, the closing drive coil) or the capacitor (the opening drive capacitor, the closing drive capacitor) in the electromagnetic operation device for a vacuum circuit breaker using the vacuum switch tube, as well as to “suppression of change in speed of the contact switching operation”.
Meanwhile,
The electromagnetic-repulsion drive switching device shown in
In Patent Document 2, there is described that “the contact is operated stably and accurately by providing the voltage control means to thereby control a peak value of the drive current to fall in the predetermined range even if the temperature of the capacitor changes”.
That is, in Patent Document 2, there is described that change in speed of the contact switching operation is suppressed by controlling the magnitude of current flowing through the closing drive coil or the opening drive coil according to a temperature change of the drive capacitor for causing a current to flow through the closing drive coil or the opening drive coil.
However, even in Patent Document 2, there is no description as to suppression of change in speed of the contact switching operation caused by a change in surrounding temperature of the magnetic coil (the opening drive coil, the closing drive coil) in an electromagnetic operation device for a vacuum circuit breaker using a vacuum switch tube.
Patent Document 1: Japanese Domestic Re-Publication No. WO2005/111641
Patent Document 2: Japanese Domestic Re-Publication No. WO01/031667
For vacuum circuit breakers, an operational duty (operation specification) is defined in the standard (JEC-2300), in which it is required to make close/open (that is, a closed/open state operation) for three cycles (50 msec).
It is noted that “JEC” represents “Japanese Electro-technical Committee”.
In normal use conditions of the vacuum circuit breakers, in order to fulfill the operational duty, energizing the drive coil is controlled by a constant period of time.
However, because of variation in ambient temperature, the resistance value of the drive coil in the electromagnetic operation device changes, so that the current value flowing through the drive coil changes. This makes change in operation speed of the movable contact in the vacuum switch tube constituting the vacuum circuit breaker.
What is particularly problematic is that “when the surrounding ambient temperature becomes lower, the temperature of the closing drive coil also becomes lower, so that the resistance value of the drive coil becomes smaller thereby making larger the value of the current flowing through the closing drive coil.”
When the value of the current flowing through the closing drive coil becomes larger, the movable contact is caused to move faster, so that contact touching (making contact between the movable contact and the fixed contact in the vacuum switch tube, that is, a closing operation) is achieved faster than that in the normal condition.
On the other hand, when the surrounding ambient temperature becomes higher, the temperature of the opening drive coil also becomes higher, so that the resistance value of the opening drive coil becomes larger thereby making smaller the value of the current flowing through the opening drive coil.
When the value of the current flowing through the opening drive coil becomes smaller, the movable contact is caused to move slower, so that the opening operation becomes slower than that in the normal condition.
In normal use conditions of the vacuum circuit breakers, energizing the closing drive coil and the opening drive coil is controlled by a constant period of time.
Thus, there is a problem that when the contact operation at the time of closing becomes faster than normal or the contact operation at the time of opening becomes slower than normal, the whole time to make close/open of the contact becomes longer, so that the operational duty of making close/open for three cycles (50 msec) could not be fulfilled.
Meanwhile, the charging capacity of each of the closing drive capacitor and the opening drive capacitor changes when its temperature becomes lower. For example, when the temperature becomes lower and thus the charging capacity becomes smaller, the charged energy becomes smaller, so that the current flowing through the closing drive coil and the opening drive coil becomes decreased to thereby affect the operation speed of the movable contact.
The solid line A shown in
As shown in
Further, when there is a change in the temperature of the drive capacitor for applying its charged voltage to the closing drive coil so as to cause a current to flow therethrough, since the value of the current flowing through the closing drive coil changes, the speed for contact touching changes to thereby affect the whole time to make close/open of the contact. Thus, there is a risk that the operational duty of “making close/open for three cycles (50 msec)” can not be fulfilled.
It is noted that shown at
Meanwhile, as described above, when the surrounding temperature becomes higher, the temperature of the opening drive coil also becomes higher, so that the resistance value of the opening drive coil becomes larger thereby making smaller the value of the current flowing through the drive coil.
When the value of current flowing through the opening drive coil becomes smaller, the movable contact is caused to move slower at the time of opening operation, so that the opening operation becomes slower than that of the normal condition.
In normal use conditions of the vacuum circuit breakers, energizing the opening drive coil is also controlled by a constant period of time.
Thus, there is also a problem that when the operation of the contact at the time of opening becomes slower than normal, the whole time to make close/open of the contact becomes longer, so that the operational duty of making close/open for three cycles (50 msec) can not be fulfilled.
The solid line A shown in
As shown in
It is noted that shown at
This invention has been made to solve such conventional problems, and an object thereof is to provide an electromagnetic operation device for a vacuum circuit breaker, which is capable of suppressing change in speed of the contact switching operation by accurately controlling the change in the current flowing through the closing drive coil and/or the opening drive coil, even if the temperature of either or both of the closing drive coil and the opening drive coil changes and even if the temperature of the closing drive capacitor or the opening drive capacitor changes, whereby the operational duty of making close/open for three cycles (50 msec) defined in the standard (JEC-2300) can be fulfilled,
An electromagnetic operation device for a vacuum circuit breaker according to the invention is such an electromagnetic operation device for a vacuum circuit breaker, which controls by its electromagnetic operation, a speed of contact switching operation of a vacuum switch tube used in the vacuum circuit breaker, said electromagnetic operation device comprising a closing drive coil for the vacuum switch tube and a first temperature sensor that measures a temperature surrounding the closing drive coil, wherein a current caused to flow through the closing drive coil is controlled based on the temperature measured by the first temperature sensor.
Further, another electromagnetic operation device for a vacuum circuit breaker according to the invention is such an electromagnetic operation device for a vacuum circuit breaker, which controls by its electromagnetic operation, a speed of contact switching operation of a vacuum switch tube used in the vacuum circuit breaker, said electromagnetic operation device comprising an opening drive coil for the vacuum switch tube and a third temperature sensor that measures a temperature surrounding the opening drive coil, wherein a current caused to flow through the opening drive coil is controlled based on the temperature measured by the third temperature sensor.
Further, another electromagnetic operation device for a vacuum circuit breaker according to the invention is such an electromagnetic operation device for a vacuum circuit breaker, which controls by its electromagnetic operation, a speed of contact switching operation of a vacuum switch tube used in the vacuum circuit breaker, said electromagnetic operation device comprising a closing drive coil for the vacuum switch tube and a first temperature sensor that measures a temperature surrounding the closing drive coil, wherein a current caused to flow through the closing drive coil is controlled based on the temperature measured by the first temperature sensor; and further comprising an opening drive coil for the vacuum switch tube and a third temperature sensor that measures a temperature surrounding the opening drive coil, wherein a current caused to flow through the opening drive coil is controlled based on the temperature measured by the third temperature sensor.
According to the invention, even if the temperature of the closing drive coil and/or the opening drive coil changes, it is possible to suppress change in the value of the current flowing through the closing drive coil and/or the opening drive coil. Thus, it becomes possible to provide an “electromagnetic operation device for a vacuum circuit breaker” that can fulfill the operational duty of making close/open for three cycles (50 msec) defined in the standard (JEC-2300) for vacuum circuit breakers.
Hereinafter, embodiments for carrying out the invention will be described based on the drawings.
Note that, in the respective figures, the same symbols represent the same or equivalent objects.
In
Note that the closing drive coil 31 corresponds to the closing drive coil 62 in
First, description will be made to a case of executing a closing operation.
The closing charging circuit 11 to which a power supply voltage is applied from the power supply 10, generates a DC voltage (charge voltage) on the basis of a charge-voltage indication value indicated from the first temperature-correction indication unit 300 as described later, to thereby charge the closing drive capacitor 21. Then, the voltage charged in the closing drive capacitor 21 is applied to the closing drive coil 31, so that a current flows through the closing drive coil 31 across the first energization unit 41 which is a switch mechanism. That is, by turning on the first energization unit 41 according to a closing instruction, a current flows through the closing drive coil 31, so that the contact in a vacuum switch tube (not shown) of the vacuum circuit breaker is driven toward its closed state.
In order that the contact operation of the vacuum circuit breaker fulfills the operation specification (making close/open for three cycles) defined in the standard (JEC-2300), the time period to reach the closed state from the open state of the contact in the vacuum switch tube used in the vacuum circuit breaker (contact closing time period), has to be suppressed from changing due to change in the temperature surrounding the closing drive coil 31 (for example, from becoming too fast).
Thus, in this embodiment, the first temperature sensor 201 for measuring the temperature surrounding the closing drive coil 31 is arranged around (near) the closing drive coil 31. The temperature measured by the first temperature sensor 201 is inputted to the first temperature-correction indication unit 300.
Meanwhile, when the temperature surrounding the closing drive capacitor 21 changes, the value of the voltage to be charged in the closing drive capacitor 21 is influenced to change, and as a result, the value of the current flowing through the closing drive coil 31 changes.
That is, when the temperature surrounding the closing drive capacitor 21 changes, the value of the current flowing through the closing drive coil 31 changes too.
Thus, in this embodiment, the second temperature sensor 202 for measuring the temperature surrounding the closing drive capacitor 21 is arranged around (near) the closing drive capacitor 21. The temperature measured by the second temperature sensor 202 is inputted to the first temperature-correction indication unit 300.
It is noted that in this embodiment, since the first temperature sensor 201 is arranged around the closing drive coil 31, a difference emerges between the temperature measured by the first temperature sensor 201 and the actual temperature of the closing drive coil 31. That is, as shown in
Further, since the second temperature sensor 202 is arranged around the closing drive capacitor 21, the change in the actual temperature of the closing drive capacitor is delayed from the change in the surrounding temperature of the closing drive capacitor 21 measured by the second temperature sensor 202, as similar to the case of delay in the measured temperature by the first temperature sensor 201.
Thus, in consideration of these delays in measured temperature, the first temperature-correction indication unit 300 determines a charge-voltage indication value for the closing charging circuit 11, on the basis of values of temperatures measured by the first temperature sensor 201 and the second temperature sensor 202 and their corresponding predetermined correction tables (or predetermined calculation formulae).
Then, the first temperature-correction indication unit 300 indicates to the closing charging circuit 11 through a D/A converter 310, a charge voltage (that is, a voltage value to be charged in the closing drive capacitor 21), so that the closing charging circuit 11 charges the closing drive capacitor 21 to the indicated voltage.
In
As shown in
A predetermined reference voltage (reference DC voltage at a predetermined temperature) 305, is firstly corrected by a first correction factor 306 produced from the first temperature-correction table 303. Further, the DC voltage corrected by the first correction factor 306 is corrected by a second correction factor 307 produced from the second temperature-correction table 304. Then, the DC voltage corrected by the first correction factor 306 and the second correction factor 307 is converted by the D/A converter 310 and is then outputted from the first temperature-correction indication unit 300, as the charge-voltage indication value for the closing charging circuit 11 (that is, as a D/A output voltage 308). The closing charging circuit 11 charges the closing drive capacitor 21 according to the charge-voltage indication value indicated from the first temperature-correction indication unit 300.
Next, description will be made to a case of executing an opening operation.
The opening charging circuit 12 to which a power supply voltage is applied from the power supply 10, generates a DC voltage (charge voltage) on the basis of a charge-voltage indication value indicated from the second temperature-correction indication unit 400, to thereby charge the opening drive capacitor 22. Then, the voltage charged in the opening drive capacitor 22 is applied to the opening drive coil 32, so that a current flows through the opening drive coil 32 across the second energization unit 42 which is a switch mechanism.
That is, by turning on the second energization unit 42 according to an opening instruction, a current flows through the opening drive coil 32, so that the contact in the vacuum switch tube (not shown) of the vacuum circuit breaker is driven toward its open state.
In order that the contact operation of the vacuum circuit breaker fulfills the operation specification (making close/open for three cycles) defined in the standard (JEC-2300), also in the case of opening operation, the time period to reach the open state from the closed state of the contact in the vacuum switch tube used in the vacuum circuit breaker (contact opening time period), has to be suppressed from changing due to change in the temperature surrounding the opening drive coil 32 (for example, from becoming too slow).
Thus, in this embodiment, the third temperature sensor 203 for measuring the temperature surrounding the opening drive coil 32 is arranged around (near) the opening drive coil 32. The temperature measured by the third temperature sensor 203 is inputted to the second temperature-correction indication unit 400.
Meanwhile, when the temperature surrounding the opening drive capacitor 22 changes, the value of the voltage to be charged in the opening drive capacitor 22 is influenced to change, and as a result, the value of the current flowing through the opening drive coil 32 changes.
Thus, in this embodiment, the fourth temperature sensor 204 for measuring the temperature surrounding the opening drive capacitor 22 is arranged around (near) the opening drive capacitor 22. The temperature measured by the fourth temperature sensor 204 is inputted to the second temperature-correction indication unit 400.
It is noted that in this embodiment, since the third temperature sensor 203 is arranged around the opening drive coil 32, a difference emerges between the temperature measured by the third temperature sensor 203 and the actual temperature of the opening drive coil 32. That is, as shown in
Further, since the fourth temperature sensor 204 is arranged around the opening drive capacitor 22, the change in the actual temperature of the opening drive capacitor is delayed from the change in the surrounding temperature of the opening drive capacitor 22 measured by the fourth temperature sensor 204, as similar to the case of delay in the measured temperature by the third temperature sensor 203.
Thus, in consideration of these delays in measured temperature, the second temperature-correction indication unit 400 determines a charge-voltage indication value for the opening charging circuit 12, on the basis of values of temperatures measured by the third temperature sensor 203 and the fourth temperature sensor 204 and their corresponding predetermined correction tables (or predetermined calculation formulae).
Then, the second temperature-correction indication unit 400 indicates to the opening charging circuit 12 through a D/A converter 410, a charge voltage (that is, a voltage value to be charged in the opening drive capacitor 22), so that the opening charging circuit 12 charges the opening drive capacitor 22 to the indicated voltage.
In
As shown in
A predetermined reference voltage (reference DC voltage at a predetermined temperature) 405, is firstly corrected by a third correction factor 406 produced from the third temperature-correction table 403. Further, the DC voltage corrected by the third correction factor 406 is corrected by a second correction factor 407 produced from the fourth temperature-correction table 404.
Then, the DC voltage corrected by the third correction factor 406 and the fourth correction factor 407 is converted by the D/A converter 410 and is then outputted from the second temperature-correction indication unit 400, as the charge-voltage indication value for the opening charging circuit 12 (that is, as a D/A output voltage 408).
The opening charging circuit 12 charges the opening drive capacitor 22 according to the charge-voltage indication value indicated from the second temperature-correction indication unit 400.
Next, description will be made to an influence by the temperature change of the closing drive capacitor or the opening drive capacitor, effected on the operation speed of the movable contact at the time of closing or opening.
When the temperature becomes lower, each capacity of the closing drive capacitor 21 and the opening drive capacitor 22 becomes smaller, so that each output voltage of the closing drive capacitor 21 and the opening drive capacitor 22 becomes lower.
This decreases the current flowing through the closing drive coil 31 or the opening drive coil 32, so that the operation speed of the movable contact at the time of closing or opening becomes slower.
With respect to the closing operation, the amount of change in the current flowing through the closing drive capacitor 31, is actually larger in the case where the contact moves faster due to decrease in the resistance value of the closing drive coil 31 when the temperature of the closing drive coil 31 becomes lower, than in the case where the contact speed becomes slower due to decrease in the capacity of the closing drive capacitor 21 when its temperature becomes lower.
Thus, a changed portion in the contact speed that is attributed to the change in the capacity of the closing drive capacitor 21, will be disappeared.
However, when the charge voltage for the closing drive capacitor 21 is corrected based solely on the temperature change of the closing drive coil 31, an error occurs due to a capacity changed portion of the closing drive capacitor 21.
The same applies to the opening operation.
In this embodiment, the charge voltage for the closing drive capacitor 21 is corrected based on both the temperature change of the closing drive coil 31 measured by the first temperature sensor 201 and the temperature change of the closing drive capacitor 21 measured by the second temperature sensor 202.
Likewise, the charge voltage for the opening drive capacitor 22 is corrected based on both the temperature change of the opening drive coil 32 measured by the third temperature sensor 203 and the temperature change of the opening drive capacitor 22 measured by the fourth temperature sensor 204.
By doing so, it is possible to stably and accurately control the current flowing through the closing drive coil 31, even if the surrounding temperature of the closing drive coil 31 or the closing drive capacitor 21 changes. Likewise, it is possible to stably and accurately control the current flowing through the opening drive coil 32, even if the surrounding temperature of the opening drive coil 32 or the opening drive capacitor 22 changes.
Accordingly, the closing operation speed and the opening operation speed of the switching contact can be accurately fallen within a predetermined range.
That is, it becomes possible to stably and accurately control the closing operation and/or the opening operation of the contact so that the vacuum circuit breaker fulfills the operational duty (that is, making close/open for three cycles).
It is noted here that in the above description, such cases are described, where the first temperature sensor 201 for measuring the surrounding temperature of the closing drive coil 31 is arranged around the closing drive coil 31, and the second temperature sensor 202 for measuring the surrounding temperature of the closing drive capacitor 21 is arranged around the closing drive capacitor 21, so that the charge voltage for the closing drive capacitor 21 is corrected based on the temperatures measured by both of the sensors; and where the third temperature sensor 203 for measuring the surrounding temperature of the opening drive coil 32 is arranged around the opening drive coil 32, and the fourth temperature sensor 204 for measuring the surrounding temperature of the opening drive capacitor 22 is arranged around the opening drive capacitor 22, so that the charge voltage for the opening drive capacitor 22 is corrected based on the temperatures measured by both of the sensors.
However, it is allowable not to arrange the second temperature sensor 202 for measuring the surrounding temperature of the closing drive capacitor 21 around the closing drive capacitor 21, and thus to provide a configuration in which the first temperature sensor 201 for measuring the surrounding temperature of the closing drive coil 31 is solely arranged around the closing drive coil 31. Also, it is allowable not to arrange the fourth temperature sensor 204 for measuring the surrounding temperature of the opening drive capacitor 22 around the opening drive capacitor 22, and thus to provide a configuration in which the third temperature sensor 203 for measuring the surrounding temperature of the opening drive coil 32 is solely arranged around the opening drive coil 32.
In this instance, although an accuracy for correcting the charge voltage for the closing drive capacitor 21 or the opening drive capacitor 22 is somewhat degraded, it is possible to control the current flowing through the closing drive coil 31 or the opening drive coil 32 to have an almost constant value.
That is, the contact switching speed can be suppressed to be almost constant even without arranging the second temperature sensor 202 or the fourth temperature sensor 204, so that the operational duty of making close/open for three cycles defined in the standard (JEC-2300) can be fulfilled.
It is noted that, in vacuum circuit breakers, when the contact switching speed of the vacuum switch tube becomes faster, the impact at the time of contact switching becomes greater, thus shortening the life duration of the vacuum switch tube, whereas when the contact switching speed becomes slower, the closing operation of the vacuum circuit breaker becomes unstable, thus causing a state incapable of keeping a power-throw.
According to this embodiment, however, it is possible to cause switching of the contact of the vacuum circuit breaker at an optimum speed (that is, a least one of the speed required to fulfill the operational duty) regardless of change in the temperature of the closing drive coil 31, the opening drive coil 32, the closing drive capacitor 21 or the opening drive capacitor 22. Thus, it becomes possible to reduce too-much impact at the time of contact switching, to thereby prolong the life duration of the vacuum switch tube in the vacuum circuit breaker.
By the way, in the above description, such a case is described, where the first temperature sensor 201 for measuring the surrounding temperature of the closing drive coil 31 is arranged around the closing drive coil 31, and the second temperature sensor 202 for measuring the surrounding temperature of the closing drive capacitor 21 is arranged around the closing drive capacitor 21, so that the charge voltage for the closing drive capacitor 21 is corrected based on the temperatures measured by both of the sensors.
Further described is such a case where the third temperature sensor 203 for measuring the surrounding temperature of the opening drive coil 32 is arranged around the opening drive coil 32, and the fourth temperature sensor 204 for measuring the surrounding temperature of the opening drive capacitor 22 is arranged around the opening drive capacitor 22, so that the charge voltage for the closing drive capacitor 21 is corrected based on the temperatures measured by both of the sensors.
As described above, an electromagnetic operation device for a vacuum circuit breaker according to this embodiment, is such an electromagnetic operation device for a vacuum circuit breaker which controls by its electromagnetic operation, a speed of contact switching operation of a vacuum switch tube used in the vacuum circuit breaker, said electromagnetic operation device including the closing drive coil 31 for the vacuum switch tube, and the first temperature sensor 201 that measures the temperature surrounding the closing drive coil 31, wherein a current caused to flow through the closing drive coil 31 is controlled based on the temperature measured by the first temperature sensor 201.
Thus, the current flowing through the closing drive coil 31 can be controlled even if the surrounding temperature of the closing drive coil 31 changes; therefore, it is possible to control the closing operation speed of the switching contact to fall within a predetermined range, and thus to move the contact so that the vacuum circuit breaker fulfills the operational duty (that is, making close/open for three cycles).
Further, an electromagnetic operation device for a vacuum circuit breaker according to this embodiment, is such an electromagnetic operation device for a vacuum circuit breaker which controls by its electromagnetic operation, a speed of contact switching operation of a vacuum switch tube used in the vacuum circuit breaker, said electromagnetic operation device including the opening drive coil 32 for the vacuum switch tube, and the third temperature sensor 203 that measures the temperature surrounding the opening drive coil 32, wherein a current caused to flow through the opening drive coil 32 is controlled based on the temperature measured by the third temperature sensor 203.
Thus, the current flowing through the opening drive coil 32 can be controlled even if the surrounding temperature of the opening drive coil 32 changes; therefore, it is possible to control the opening operation speed of the switching contact to fall within a predetermined range, and thus to move the contact so that the vacuum circuit breaker fulfills the operational duty.
Further, an electromagnetic operation device for a vacuum circuit breaker according to this embodiment, is such an electromagnetic operation device for a vacuum circuit breaker which controls by its electromagnetic operation, a speed of contact switching operation of a vacuum switch tube used in the vacuum circuit breaker, said electromagnetic operation device including the closing drive coil 31 for the vacuum switch tube, and the first temperature sensor 201 that measures the temperature surrounding the closing drive coil 31, wherein a current caused to flow through the closing drive coil 31 is controlled based on the temperature measured by the first temperature sensor 201; and said electromagnetic operation device further including the opening drive coil 32 for the vacuum switch tube, and the third temperature sensor 203 that measures the temperature surrounding the opening drive coil 32, wherein a current caused to flow through the opening drive coil 32 is controlled based on the temperature measured by the third temperature sensor 203.
Thus, the currents flowing through the closing drive coil 31 and the opening drive coil 32 can be controlled even if the surrounding temperature of the closing drive coil 31 or the opening drive coil 32 changes; therefore, it is possible to control the closing operation speed and the opening operation speed of the switching contact to fall within predetermined ranges, and thus to move the contact so that the vacuum circuit breaker surely fulfills the operational duty.
Further, an electromagnetic operation device for a vacuum circuit breaker according to this embodiment, is such an electromagnetic operation device for a vacuum circuit breaker which controls by its electromagnetic operation, a speed of contact switching operation of a vacuum switch tube used in the vacuum circuit breaker, said electromagnetic operation device including the closing drive coil 31 for the vacuum switch tube, the closing drive capacitor 21 for causing a contact-closing drive current to flow through the closing drive coil 31, the closing charging circuit 11 that charges the closing drive capacitor 21, the first temperature sensor 201 that measures the temperature surrounding the closing drive coil 31, and the first temperature-correction indication unit 300 that indicates to the closing charging circuit 11, a charge voltage correction value for the closing drive capacitor 21, on the basis of the temperature measured by the first temperature sensor 201.
Since the first temperature-correction indication unit 300 indicates to the closing charging circuit 11, a charge voltage correction value for the closing drive capacitor 21, on the basis of the temperature measured by the first temperature sensor 201, it is possible to accurately control the current flowing through the closing drive coil 31 even if the surrounding temperature of the closing drive coil 31 changes.
Further, in an electromagnetic operation device for a vacuum circuit breaker according to this embodiment, the second temperature sensor 202 is provided that measures the temperature surrounding the closing drive capacitor 21, and the first temperature-correction indication unit 300 indicates to the closing charging circuit 11, the charge voltage correction value for the closing drive capacitor 21, on the basis of the temperatures measured by the first temperature sensor 201 and the second temperature sensor 202.
Thus, it is possible to accurately control the current flowing through the closing drive coil 31 even if the surrounding temperatures of both of the closing drive coil 31 and the closing drive capacitor 21 change.
Further, an electromagnetic operation device for a vacuum circuit breaker according to this embodiment, is such an electromagnetic operation device for a vacuum circuit breaker which controls by its electromagnetic operation, a speed of contact switching operation of a vacuum switch tube used in the vacuum circuit breaker, said electromagnetic operation device including the opening drive coil 32 for the vacuum switch tube, the opening drive capacitor 22 for causing a contact-opening drive current to flow through the opening drive coil 32, the opening charging circuit 12 that charges the opening drive capacitor 22, the third temperature sensor 203 that measures the temperature surrounding the opening drive coil 32, and the second temperature-correction indication unit 400 that indicates to the opening charging circuit 12, a charge voltage correction value for the opening drive capacitor 22, on the basis of the temperature measured by the third temperature sensor 203.
Since the second temperature-correction indication unit 400 indicates to the opening charging circuit 12, a charge voltage correction value for the opening drive capacitor 22, on the basis of the temperature measured by the third temperature sensor 203, it is possible to accurately control the current flowing through the opening drive coil 32 even if the surrounding temperature of the opening drive coil 32 changes.
Further, in an electromagnetic operation device for a vacuum circuit breaker according to this embodiment, the fourth temperature sensor 204 is provided that measures the temperature surrounding the opening drive capacitor 22, and the second temperature-correction indication unit 400 indicates to the opening charging circuit 12, the charge voltage correction value for the opening drive capacitor 22, on the basis of the temperatures measured by the third temperature sensor 203 and the fourth temperature sensor 204.
Thus, it is possible to accurately control the current flowing through the closing drive coil 31 even if the surrounding temperatures of both of the opening drive coil 32 and the opening drive capacitor 22 change.
Further, an electromagnetic operation device for a vacuum circuit breaker according to this embodiment, is such an electromagnetic operation device for a vacuum circuit breaker which controls by its electromagnetic operation, a speed of contact switching operation of a vacuum switch tube used in the vacuum circuit breaker, said electromagnetic operation device including the closing drive coil 31 for the vacuum switch tube, the closing drive capacitor 21 for causing a contact-closing drive current to flow through the closing drive coil 31, the closing charging circuit 11 that charges the closing drive capacitor 21, the first temperature sensor 201 that measures a temperature surrounding the closing drive coil 31, the second temperature sensor 202 that measures a temperature surrounding the closing drive capacitor 21, and the first temperature-correction indication unit 300 that indicates to the closing charging circuit 11, a charge voltage correction value for the closing drive capacitor 21, on the basis of the temperatures measured by the first temperature sensor 201 and the second temperature sensor 202, and said electromagnetic operation device further including the opening drive coil 32 for the vacuum switch tube, the opening drive capacitor 22 for causing a contact-opening drive current to flow through the opening drive coil 32, the opening charging circuit 12 that charges the opening drive capacitor 22, the third temperature sensor 203 that measures a temperature surrounding the opening drive coil 32, the fourth temperature sensor 204 that measures a temperature surrounding the opening drive capacitor 22, and the second temperature-correction indication unit 400 that indicates to the opening charging circuit 12, a charge voltage correction value for the opening drive capacitor 22, on the basis of the temperatures measured by the third temperature sensor 203 and the fourth temperature sensor 204.
Thus, it is possible to accurately control the current flowing through the closing drive coil 31 and the opening drive coil 32 even if the surrounding temperatures of the closing drive coil 31 and the closing drive capacitor 21 or the surrounding temperatures of the opening drive coil 32 and the opening drive capacitor 22 change.
In the foregoing Embodiment 1, description is made to the case where the first temperature sensor 201 for measuring the surrounding temperature of the closing drive coil 31 is arranged around the closing drive coil 31, or the case where the third temperature sensor 203 for measuring the surrounding temperature of the opening drive coil 32 is arranged around the opening drive coil 32, whereas, an electromagnetic operation device according to Embodiment 2 is characterized in that the first temperature sensor 201 is embedded in the closing drive coil 31 and the third temperature sensor 203 is embedded in the opening drive coil 32.
This makes it possible to directly measure the temperature of the closing drive coil 31 or the opening drive coil 32, and thus to enhance accuracy for correcting the charge voltage for the closing drive capacitor 21 or the opening drive capacitor 22 with respect to a change in the surrounding temperature.
That is, according to this embodiment, since the current flowing through the closing drive coil 31 or the opening drive coil 32 can be more accurately controlled, it becomes possible to suppress the closing operation speed of the switching contact to be within a predetermined range.
In the foregoing Embodiment 1, the temperature of the closing drive coil 31 is measured by using the first temperature sensor 201 arranged around the closing drive coil 31 and the temperature of the opening drive coil 32 is measured by using the third temperature sensor 203 arranged around the opening drive coil 32, whereas this embodiment is characterized in that, as shown in
In this embodiment, a weak current is caused to flow through the closing drive coil 31 by the first temperature-measuring energization unit 43.
Then, the first temperature-correction indication unit 300 determines the resistance value of the closing drive coil 31 by detecting a value of the voltage produced due to the weak current flowing through the closing drive coil 31.
Because the resistance value of the closing drive coil 31 changes depending on its temperature, the first temperature-correction indication unit 300 determines the temperature of the closing drive coil 31 through calculation after determined the resistance value of the closing drive coil 31.
The first temperature-correction indication unit 300 corrects the charge voltage for the closing drive capacitor 21 on the basis of both of the temperature of the closing drive coil 31 determined through calculation and the temperature of the closing drive capacitor 21 measured by the second temperature sensor 202.
Likewise, in this embodiment, a weak current is caused to flow through the opening drive coil 32 by the second temperature-measuring energization unit 44.
Then, the second temperature-correction indication unit 400 determines the resistance value of the opening drive coil 32 by detecting a value of the voltage produced due to the weak current flowing through the opening drive coil 32.
Because the resistance value of the opening drive coil 32 changes depending on its temperature, the second temperature-correction indication unit 400 determines the temperature of the opening drive coil 32 through calculation after determined the resistance value of the opening drive coil 32.
The second temperature-correction indication unit 400 corrects the charge voltage for the opening drive capacitor 22 on the basis of both of the temperature of the opening drive coil 32 determined through calculation and the temperature of the opening drive capacitor 22 measured by the fourth temperature sensor 204.
As described above, an electromagnetic operation device according to this embodiment includes, instead of the first temperature sensor 201 in Embodiment 1, the first temperature-measuring energization unit 43 for causing a current to flow through the closing drive coil 31; wherein the first temperature-correction indication unit 300 includes a closing-drive-coil temperature measuring means that determines the resistance value of the closing drive coil 31 by detecting a value of the voltage produced due to the current flowing through the closing drive coil 31 caused by the first temperature-measuring energization unit 43, followed by measuring the temperature of the closing drive coil 31 through calculation from the determined resistance value; and wherein the first temperature-correction indication unit 300 indicates to the closing charging circuit 11, the charge voltage correction value for the closing drive capacitor 21, on the basis of the temperatures measured by the closing-drive-coil temperature measuring means and the second temperature sensor 202.
Thus, according to this embodiment, it becomes possible to determine the temperature of the closing drive coil 31 without using the first temperature sensor 201 for measuring the temperature of the closing drive coil 31. Further, an electromagnetic operation device according to this embodiment includes, instead of the third temperature sensor 203 in Embodiment 1, the second temperature-measuring energization unit 44 for causing a current to flow through the opening drive coil 32; wherein the second temperature-correction indication unit 400 includes an opening-drive-coil temperature measuring means that determines the resistance value of the opening drive coil 32 by detecting a value of the voltage produced due to the current flowing through the opening drive coil caused by the second temperature-measuring energization unit 44, followed by measuring the temperature of the opening drive coil 32 through calculation from the determined resistance value; and wherein the second temperature-correction indication unit 400 indicates to the opening charging circuit 12, the charge voltage correction value for the opening drive capacitor 12, on the basis of the temperatures measured by the opening-drive-coil temperature measuring means and the fourth temperature sensor 204.
Thus, according to this embodiment, it becomes possible to determine the temperature of the opening drive coil 32 without using the third temperature sensor 203 for measuring the temperature of the opening drive coil 32.
Further, an electromagnetic operation device according to this embodiment includes, instead of the first temperature sensor 201, the first temperature-measuring energization unit 43 for causing a current to flow through the closing drive coil 31, wherein the first temperature-correction indication unit 300 indicates to the closing charging circuit 11, the charge voltage correction value for the closing drive capacitor 21, on the basis of the temperatures measured by the closing-drive-coil temperature measuring means and the second temperature sensor 202, said electromagnetic operation device further including, instead of the third temperature sensor 203, the second temperature-measuring energization unit 44 for causing a current to flow through the opening drive coil 32, wherein the second temperature-correction indication unit 400 indicates to the opening charging circuit 12, the charge voltage correction value for the opening drive capacitor 22, on the basis of the temperatures measured by the opening-drive-coil temperature measuring means and the fourth temperature sensor 204.
Thus, according to this embodiment, it becomes possible to determine the temperature of the closing drive coil 31 without using the first temperature sensor 201 for measuring the temperature of the closing drive coil 31, and also to determine the temperature of the opening drive coil 32 without using the third temperature sensor 203 for measuring the temperature of the opening drive coil 32.
This invention is useful for actualizing an electromagnetic operation device for a vacuum circuit breaker which can suppress a change in closing operation speed or opening operation speed even if the temperature surrounding the drive coil or the drive capacitor changes, thereby making it possible to fulfill the operational duty of making close/open for three cycles (50 msec) defined in the standard (JEC-2300).
| Number | Date | Country | Kind |
|---|---|---|---|
| 2011-185603 | Aug 2011 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2011/078646 | 12/12/2011 | WO | 00 | 2/27/2014 |
