JP5617759B2 - Electromagnetic vacuum breaker - Google Patents

Description

  The present invention relates to an electromagnetically operated vacuum circuit breaker provided with a damper that reduces chattering during a closing operation.

  When an overcurrent flows due to a short circuit accident or the like, the vacuum circuit breaker opens the contact of the vacuum valve with an operating device to interrupt the overcurrent. In addition to this breaking performance, the vacuum circuit breaker is required to have the ability to suppress chattering when it is turned on in order to prevent the occurrence of surges and welding of contacts. Chattering means that when the movable contact comes into contact with the fixed contact during the closing operation, the movable contact bounces and the two contacts are separated. If a voltage is applied between the two contacts, an arc may occur during chattering and the contacts may be welded. Therefore, in the conventional vacuum circuit breaker, just before the end of the movable electrode with the movable contact fixed to one end, the piston rod of the hydraulic shock absorber (oil damper) is inserted into the lever from the small orifice to the lever. Driven by a dashpot mechanism that flows out by pressing force, the acceleration at the end of the insertion of the movable electrode is reduced, and chattering that occurs between the fixed electrode with a fixed contact fixed at one end is prevented at the time of application. (For example, refer to Patent Document 1).

  Further, in a conventional electromagnetic operating device as an operating device for interrupting or closing the circuit breaker, a plunger (movable element) is driven to a closing position by exciting a closing coil (for example, Patent Documents). 2).

JP-A-11-203998 JP2008-53387

  The kinetic energy that can be absorbed by the damper varies depending on various manufacturing factors such as the accuracy of the orifice diameter, and has individual differences. In a conventional electromagnetically operated vacuum circuit breaker, when a damper with high kinetic energy that can be absorbed due to this individual difference is used, the contact closing speed becomes slow, and the breaking performance required for an AC vacuum circuit breaker, especially immediately after There is a problem that it may be difficult to achieve the performance (for example, the rated interruption time defined in the JEC-2300 standard) that completes the interruption within 3 cycles after opening the pole.

  On the other hand, in the conventional electromagnetically operated vacuum circuit breaker, conversely, if a damper with low kinetic energy that can be absorbed by the individual difference is used, the throwing speed of the contact may be increased and the performance of suppressing chattering may not be satisfied. There was a problem.

  The present invention has been made to solve the above-described problems, and even when a damper having an individual difference in kinetic energy that can be absorbed is used, an electromagnetic operation capable of achieving both a predetermined cutoff performance and a performance for suppressing chattering. An object of the present invention is to provide a vacuum circuit breaker.

The electromagnetically operated vacuum circuit breaker according to the present invention includes a vacuum valve having a pair of contacts in a vacuum vessel, a driving coil and a mover, and one contact of the pair of contacts to the other contact. an electromagnetic operating device to abut the pair of contacts so driven, and a damper to absorb the kinetic energy when the abutment, on the basis of the individual difference of kinetic energy that can be absorbed in the damper, the pair of contacts are brought to a value just before the kinetic energy is in a range to achieve both suppressing performance interruption performance and chattering in contact, in which a magnetic flux density adjusting unit to adjust the magnetic flux density Ru is generated in the driving coil.

  The present invention can provide an electromagnetically operated vacuum circuit breaker that can achieve both a predetermined breaking performance and a performance for suppressing chattering even when a damper having an individual difference in kinetic energy that can be absorbed is used.

It is a fragmentary sectional view which shows the opening state of the electromagnetically operated vacuum circuit breaker which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the electromagnetic operating apparatus and magnetic flux density adjustment part of the electromagnetically operated vacuum circuit breaker which concern on Embodiment 1 of this invention. It is a fragmentary sectional view which shows the state which injection | throwing-in of the electromagnetically operated vacuum circuit breaker concerning Embodiment 1 of this invention was completed. It is a fragmentary sectional view which shows the state at the time of the operation | movement of the damper starting at the time of the injection | throwing-in operation | movement of the electromagnetically operated vacuum circuit breaker concerning Embodiment 1 of this invention. It is a fragmentary sectional view which shows the state at the moment when the movable electrode contact | abutted at the time of the injection | throwing-in operation | movement of the electromagnetically operated vacuum circuit breaker concerning Embodiment 1 of this invention. It is a flowchart for adjusting the charging voltage of the charging capacitor of the electromagnetically operated vacuum circuit breaker according to Embodiment 1 of the present invention. It is a block diagram which shows the structure of the electromagnetic operating apparatus and magnetic flux density adjustment part of the electromagnetically operated vacuum circuit breaker which concern on Embodiment 2 of this invention. It is a flowchart for adjusting the resistance value of the resistance apparatus for adjustment of the electromagnetically operated vacuum circuit breaker according to Embodiment 2 of the present invention. It is a block diagram which shows the structure of the electromagnetic operating apparatus and magnetic flux density adjustment part of the electromagnetically operated vacuum circuit breaker which concern on Embodiment 3 of this invention. It is a flowchart for changing the connection state of the capacity | capacitance adjustment capacitor | condenser of the electromagnetically operated vacuum circuit breaker which concerns on Embodiment 3 of this invention. It is a block diagram which shows the structure of the electromagnetic operating apparatus and magnetic flux density adjustment part of the electromagnetically operated vacuum circuit breaker which concern on Embodiment 4 of this invention. It is a flowchart for changing the connection state of the several drive coil of the electromagnetically operated vacuum circuit breaker which concerns on Embodiment 4 of this invention.

Embodiment 1 FIG.
FIG. 1 is a partial cross-sectional view showing an open state of an electromagnetically operated vacuum circuit breaker 1 according to Embodiment 1 of the present invention. The vacuum valve 2 serving as a blocking portion for blocking current includes an end portion of a fixed electrode 3 having a fixed contact and an end portion of a movable electrode 4 having a movable contact contacting and separating from the fixed contact in a vacuum vessel. Contained. The movable electrode 4 is connected to the connecting rod 8 of the electromagnetic operating device 100 through the insulating rod 5, the spring receiver 6, and the contact pressure spring 7. The electromagnetic operating device 100 includes a connecting rod 8, a driving coil 10, a mover 11, and a stator 12. As shown in FIG. 2, the magnetic flux density adjusting unit 200 includes an operation board 9, a closing capacitor 17, and an opening capacitor 18. A current is supplied to the coil 10. The damper 13 absorbs an impact when the movable electrode 4 is driven by the electromagnetic operating device 100 to collide with the fixed electrode 3. The damper 13 is fixed to a damper fixing plate 14, and the damper fixing plate 14 is held by a tank 15 that houses the vacuum valve 2. The tank 15 is filled with an insulating medium such as SF6 gas or dry air, and an O-ring 16 is provided so that the closing operation and the opening operation can be performed in an airtight state.

  Although FIG. 1 shows a single-phase portion, in the case of a three-phase electromagnetically operated vacuum circuit breaker, three sets of the single-phase portions may be arranged in parallel at a predetermined interval. Moreover, it is good also as a structure which drives the vacuum valve 2 for 3 phases with one electromagnetic operating device 100. FIG.

  The closing operation and the opening operation will be described in more detail. When the electromagnetic operation type vacuum circuit breaker 1 is in an open state, when an input command is input to the operation board 9 in the magnetic flux density adjusting unit 200, a current is supplied from the operation board 9 to the drive coil 10, and the drive coil 10 generates a magnetic flux that magnetically attracts the mover 11 toward the stator 12. The movable element 11 receives a force in the axial direction (rightward in FIG. 1) due to the magnetic attraction force, and is connected to the connecting rod 8, the contact pressure spring 7, the spring receiver 6, the insulating rod 5, and the movable electrode 4. Begins to move together, and the movable electrode 4 comes into contact with the fixed electrode 3. At this point, the movable element 11 is configured not to contact the stator 12. Further, the making operation proceeds, and the mover 11 compresses the contact pressure spring 7 so that the mover 11 comes into contact with the stator 12, and as shown in FIG. It reaches.

  The electromagnetic operating device 100 is provided with a permanent magnet (not shown) that generates a magnetic flux for maintaining a state in which the charging is completed. In the closing operation, the operation board is arranged so that the magnetic flux generated by the permanent magnet and the magnetic flux generated by the driving coil 10 are in the same direction between the surfaces where the movable element 11 and the stator 12 abut. Current is supplied from 9 to the driving coil 10. In addition, in the state where the insertion is completed, it is not necessary to supply current from the operation board 9 to the driving coil 10, and the state where the insertion is completed is maintained using the magnetic flux of the permanent magnet.

  Subsequently, when a contact opening command is input to the operation board 9 in the state where the insertion shown in FIG. 3 is completed, a current is supplied from the operation board 9 to the driving coil 10. At this time, the polarity of the current supplied to the driving coil 10 is opposite to that in the above-described closing operation, and the magnetic flux generated by the permanent magnet on the surface where the movable element 11 and the stator 12 are in contact with each other. The magnetic flux by the drive coil 10 is generated in the opposite direction. As a result, the force with which the permanent magnet holds the movable element 11 in the state where the insertion of the movable element 11 is completed becomes small, and when the force of the contact pressure spring 7 becomes larger than the retained force, the connecting rod 8 connected to the movable element 11. At the same time, it moves in the axial direction (leftward in FIG. 3), and the contact pressure spring 7 begins to expand. When the contact pressure spring 7 extends to the maximum length (not a free length) defined by its structure, the movable electrode 4, the insulating rod 5 and the spring receiver 6 are moved to the movable element 11, the connecting rod 8, and the contact pressure spring 7. And move together. Thereafter, the movable element 11 comes into contact with a stationary plate (not shown) and stops, thereby reaching a state where the opening is completed.

  In addition, when only the driving energy for opening the contact pressure spring 7 and the electromagnetic operating device 100 cannot satisfy the opening speed required for the vacuum circuit breaker, for example, on the left side of the mover 11 in FIG. An open spring (pull spring) may be arranged.

  As shown in FIG. 2, the magnetic flux density adjusting unit 200 includes a closing capacitor 17 and a opening capacitor 18 as capacitors for storing electric charges for energizing the driving coil 10. The charging capacitor 17 and the opening capacitor 18 are charged to a constant voltage by a charging voltage control circuit 9 a provided in the operation board 9. The charging voltage control circuit 9a is operated by an external power source. When the operation board 9 receives a closing command from the outside, a current is supplied from the charging capacitor 17 to the driving coil 10. When the operation board 9 receives a opening command from the outside, the operation board 9 is driven from the opening capacitor 18. Current is supplied to the working coil 10. The product of the current value supplied from the charging capacitor 17 or the opening capacitor 18 and the number of coil turns becomes a magnetomotive force, and the kinetic energy of the mover 11 during the closing or opening operation changes depending on the magnitude of the magnetomotive force.

  FIG. 4 is a diagram showing a state at the time when the damper 13 immediately before the movable electrode 4 comes into contact with the fixed electrode 3 starts to act as a shock absorber during the closing operation. FIG. 5 is a diagram showing a state at the moment when the movable electrode 4 comes into contact with the fixed electrode 3 during the closing operation, and shows a moment when the movable electrode 4 and the fixed electrode 3 are in direct electrical contact. In this embodiment, the movable electrode 4 is operated by operating the damper 13 in the state shown in FIGS. 4 to 5, that is, for a predetermined period immediately before the movable electrode 4 contacts the fixed electrode 3, in other words, for a predetermined position range. Then, the movable electrode 4 and the fixed electrode 3 come into contact with each other.

  If the damper 13 is not disposed, the movable electrode 4 rebounds after the movable electrode 4 and the fixed electrode 3 come into contact with each other, and the movable electrode 4 and the fixed electrode 3 are separated from each other. It may not be obtained. If a voltage is applied between the movable electrode 4 and the fixed electrode 3 when chattering occurs, an arc is generated between the movable contact and the fixed contact that are the contact surfaces of both electrodes, and depending on the phase of the voltage, the contact May weld. The kinetic energy to be absorbed by the damper 13 varies depending on the rating of the vacuum circuit breaker or the like so that such a problem does not occur, but the number of dampers 13, the distance to be operated, the shape of the orifice in the damper 13, etc. By setting to, desired performance can be realized.

  In the electromagnetically operated vacuum circuit breaker 1, the density of magnetic flux generated by the driving coil 10 can be changed according to the value of the current supplied to the driving coil 10, and the closing speed can be changed. If this is used, even if the kinetic energy that can be absorbed by the applied damper 13 deviates from the design value due to individual differences of the damper 13, the kinetic energy immediately before the movable electrode 4 and the fixed electrode 5 of the movable electrode 4 come into contact with each other. Can be made constant.

  When producing the electromagnetically operated vacuum circuit breaker 1, assuming the damper 13 having a kinetic energy absorption characteristic within a predetermined allowable range from the design center value, the performance required for the vacuum circuit breaker such as the breaking performance and the chattering performance is obtained. Produce to meet. However, for example, if the kinetic energy that can be absorbed by the damper 13 actually applied is smaller than the allowable range due to individual differences of the dampers 13, the kinetic energy at the moment when the movable electrode 4 contacts the fixed electrode 3 is within the allowable range. It becomes larger than the damper 13 and the chattering time becomes longer, so that it is not possible to satisfy performances such as durability and welding resistance required as a vacuum circuit breaker.

  Conversely, when a damper whose kinetic energy that can be absorbed due to individual differences is larger than the allowable range is applied, the kinetic energy at the moment of contact with the fixed electrode 3 becomes smaller than that of the damper 13 within the allowable range, and desired chattering is achieved. Although the related performance can be satisfied, the speed immediately before the movable electrode 4 and the fixed electrode 5 come into contact with each other is reduced. As described above, if the speed immediately before the movable electrode 4 and the fixed contact electrode 3 contact each other becomes low, it takes too much time for the movable electrode 3 and the fixed electrode 4 to contact each other. In some cases, it is difficult to achieve the performance (for example, the rated interruption time defined in the JEC-2300 standard) for completing the interruption within 3 cycles.

  Therefore, by setting the current flowing in the driving coil 10 according to the damper 13 to be applied, the kinetic energy of the movable electrode 4 immediately before the movable electrode 4 comes into contact with the fixed electrode 3 in the closing operation is changed. It can be prevented from changing due to characteristic variations. If the kinetic energy that can be absorbed by each damper 13 is preliminarily measured and grasped before being incorporated into the electromagnetically operated vacuum circuit breaker 1 or before the final adjustment in the manufacturing process, the adjustment becomes easy. Further, without measuring the characteristics of the individual dampers 13 in advance, the range of the characteristics may be estimated by grasping the maximum and minimum manufacturing tolerances of the dampers 13.

  Next, in this embodiment, to obtain the kinetic energy of the movable electrode 4 immediately before the desired movable electrode 4 abuts against the fixed electrode 3 according to the current value supplied to the driving coil 10, in other words, the desired input speed. The method will be described.

  In order to adjust the current value to be supplied to the driving coil 10, the charging voltage of the charging capacitor 17 may be adjusted. FIG. 6 shows a flowchart for adjusting the charging voltage. First, in step S001, data relating to kinetic energy that can be absorbed by the damper 13, for example, catalog values of the adopted damper 13, characteristics measured in advance, and measurement data relating to chattering actually obtained by being incorporated in an electromagnetically operated vacuum circuit breaker. From the above, the kinetic energy that can be absorbed by the damper 13 to be applied is estimated, and if the estimated value is larger than the allowable range assumed in the design, go to step S002, and if it is within the allowable range, go to step S003. If it is smaller than the allowable range, the process proceeds to step S004. This estimation may be performed using a computer incorporated in the test and evaluation apparatus for the electromagnetically operated vacuum circuit breaker 1.

  In steps S002 to S004, the charging capacitor 17 is charged by changing the charging voltage setting value of the charging voltage control circuit 9a of the operation board 9. Specifically, in step S002, the charging voltage setting value is increased, in step S003, the charging voltage setting value is maintained, and in step S004, the charging voltage setting value is decreased. The change range of the charging voltage setting value in steps S002 and S004 may be a value estimated based on a difference value from the allowable range or a fixed value. If an appropriate charging voltage setting value corresponding to the individual difference of the damper 13 is obtained in advance, the time for changing the charging voltage setting value of the charging capacitor 17 can be shortened.

  When the charging of the charging capacitor 17 is completed, the process proceeds to step S005, where a charging command is given to the operation board 9, a discharging command (not shown) of the charging capacitor 17 in the operating board 9 is issued, and the electromagnetic operation type The vacuum circuit breaker 1 is caused to perform a closing operation.

  Next, in step S006, the occurrence state of chattering at the time of the closing operation is measured. In step S007, the measurement result is evaluated. If it is within the allowable range, the charging voltage setting is stored in the storage device (see FIG. Save to (not shown) and exit. If it is outside the allowable range, the measurement result is returned to step S001, and the kinetic energy that can be absorbed by the damper 13 to be applied is estimated again.

  In this way, if the magnetic flux density generated by the driving coil 10 is adjusted by adjusting the current value supplied to the driving coil 10 by the magnetic flux density adjusting unit 200, an appropriate input speed that matches the characteristics of the applied damper 13. It can be. That is, the kinetic energy (dosing speed) of the movable electrode 4 decelerated by the damper 13 immediately before the movable electrode 4 and the fixed electrode 5 abut during the making operation can be set within a predetermined range.

  Further, since the magnetic flux density can be adjusted only by changing the charging voltage setting value of the charging capacitor 17, not only during production but also after the product is shipped, the electromagnetic operating device 100 and the damper 13 are characterized by aging and contact wear. Even if fluctuations occur, it can be adjusted by the same method.

  In addition, since the kinetic energy of the mover 11 greatly depends on the current peak value of the driving coil 10, the kinetic energy is adjusted by using the charging voltage value of the input capacitor 17 having a large relationship with the current peak value. This can be done by widening the adjustable range.

  In addition, since the operation board 9 and the charging capacitor 17 provided in the conventional electromagnetically operated vacuum circuit breaker can be diverted and adjusted as necessary, it is necessary to add a new member. Therefore, adjustment according to the individual difference of the damper 13 can be realized at low cost.

  In the above example, the operation board 9 is provided with a function of charging the charging capacitor 17 to the charging voltage set value. However, a function other than the operation board 9 may be provided.

  As described above, the electromagnetically operated vacuum circuit breaker 1 according to the present invention has the vacuum valve 2 having a pair of contacts in the vacuum vessel, the driving coil 10 and the mover 11, and one of the pair of contacts. An electromagnetic operating device 100 that drives the movable electrode 4 to which the contact is fixed to the fixed electrode 3 to which the other contact is fixed to bring the pair of contacts into contact with each other, and a damper that absorbs kinetic energy at the time of the contact 13 and a magnetic flux density adjusting unit 200 that adjusts the magnetic flux density generated by the driving coil 10 to a predetermined value based on individual differences in kinetic energy that can be absorbed by the damper 13. Even if the damper 13 having individual differences is used, it is possible to provide the electromagnetically operated vacuum circuit breaker 1 that can achieve both a predetermined breaking performance and a performance for suppressing chattering.

Embodiment 2. FIG.
In the first embodiment, the configuration and method for adjusting the current supplied to the driving coil 10 by changing the charging voltage of the charging capacitor 17 have been described. However, in the second embodiment, the adjustment resistor device 19 is provided. To adjust the current.

  As shown in FIG. 7, the magnetic flux density adjusting unit 200 of this embodiment includes an adjusting resistor device 19 connected in series between the operation board 9 and the driving coil 10. The adjusting resistor device 19 may be a variable resistor, a resistor folder with a replaceable resistor, or a device that switches connection of a plurality of resistors. Since the other configuration is the same as that of the first embodiment, the description thereof is omitted.

  FIG. 8 shows a flowchart for adjusting the current using the adjusting resistance device 19. First, in step S001, data relating to kinetic energy that can be absorbed by the damper 13, for example, catalog values of the adopted damper 13, characteristics measured in advance, and measurement data relating to chattering actually obtained by being incorporated in an electromagnetically operated vacuum circuit breaker. From the above, the kinetic energy that can be absorbed by the damper 13 to be applied is estimated, and if this estimated value is larger than the allowable range assumed in the design, go to step S102, and if it is within the allowable range, go to step S103. If it is smaller than the allowable range, the process proceeds to step S104.

  In steps S102 to S104, the charging capacitor 17 is charged using the charging voltage control circuit 9a (not shown) of the operation board 9, and the resistance value of the adjusting resistor device 19 is changed to an appropriate value. Specifically, the resistance value is decreased in step S102, the resistance value is maintained in step S103, and the resistance value is increased in step S104. The change range of the resistance value in steps S102 and S104 may be a value estimated based on a difference value from the allowable range or may be a fixed value. If an appropriate resistance value corresponding to the individual difference of the damper 13 is obtained in advance, the time for changing the resistance value of the adjusting resistor device 19 can be shortened. Since step S005 and subsequent steps are the same as in the first embodiment, description thereof is omitted.

  As described above, since the adjusting speed can be easily adjusted by the resistance value using the adjusting resistance device 19, not only during production but also after the product shipment, the electromagnetic operating device 100 and the damper 13 may deteriorate over time. Even if characteristics change due to contact wear, adjustment can be made in the same manner.

  In addition, since the kinetic energy of the mover 11 greatly depends on the current peak value of the driving coil 10, it is adjusted by using the resistance value of the adjusting resistor device 19 that has a large relationship with the current peak value. This can be done by widening the adjustable range.

  Further, since it is only necessary to connect the adjusting resistor device 19 between the operation board 9 and the driving coil 10, the configuration is simple, and the adjustment according to the individual difference of the damper 13 can be realized at low cost.

  In the above, the input speed is adjusted by changing the resistance value of the adjustment resistor device 19, but the adjustment is performed by changing both the charging voltage of the input capacitor 17 and the resistance value of the adjustment resistor device 19. May be.

Embodiment 3 FIG.
In the first embodiment, the configuration and method for adjusting the current supplied to the driving coil 10 by changing the charging voltage of the input capacitor 17 have been described. In the third embodiment, the capacitance adjusting capacitor 20 is To adjust the current.

  As shown in FIG. 9, the magnetic flux density adjusting unit 200 of this embodiment includes a capacitance adjusting capacitor 20 and a capacitor connection switching unit 21 in addition to the magnetic flux density adjusting unit 200 shown in FIG. 2. . The capacitor connection switching unit 21 is connected between the operation board 9 and the input capacitor 17 and the capacity adjustment capacitor 20, and switches the connection state between the operation board 9, the input capacitor 17 and the capacity adjustment capacitor 20. Since the other configuration is the same as that of the first embodiment, the description thereof is omitted.

  FIG. 10 shows a flowchart for adjusting the current using the capacitor 20 for capacitance adjustment and the capacitor connection switching unit 21. First, in step S001, data relating to kinetic energy that can be absorbed by the damper 13, for example, catalog values of the adopted damper 13, characteristics measured in advance, and measurement data relating to chattering actually obtained by being incorporated in an electromagnetically operated vacuum circuit breaker. From the above, the kinetic energy that can be absorbed by the damper 13 to be applied is estimated, and if the estimated value is larger than the allowable range assumed in the design, go to step S202, and if it is within the allowable range, go to step S203. If it is smaller than the allowable range, the process proceeds to step S204.

  In steps S202 to S204, the charging capacitor 17 and the capacity adjusting capacitor 20 are charged using the charging voltage control circuit 9a (not shown) of the operation board 9, and the charging capacitor 17 is switched using the capacitor connection switching unit 21. And the connection state of the capacitor 20 for adjusting the capacitance are changed. Specifically, the input capacitor 17 and the capacitance adjusting capacitor 20 are connected in series in step S202, the capacitance adjusting capacitor 20 is not connected in step S203, and the input capacitor 17 and the capacitance adjusting capacitor in step S204. A capacitor 20 is connected in parallel. Since steps S005 and S006 are the same as those in the first embodiment, the description thereof is omitted.

  In step S007, the measurement result obtained in step S006 is evaluated. If the measurement result is within the allowable range, the charging voltage setting is stored in a storage device (not shown) in the operation board 9 and the process ends. On the other hand, if it is out of the allowable range, the process proceeds to step S208, and a new capacitance adjusting capacitor 20 having a capacitance different from that of the existing capacitance adjusting capacitor 20 is obtained based on the measurement result and the evaluation result. Select and replace the existing capacitance adjusting capacitor 20. This replacement operation may be either automatic or manual. Subsequently, using the new capacitance adjusting capacitor 20, the adjustment is performed again from step S001.

  As described above, since the charging speed can be easily adjusted by using the capacitance adjusting capacitor 20, the aging of the electromagnetic operating device 100 and the damper 13 not only during production but also after product shipment. Even if characteristics change due to contact wear, the adjustment can be made in the same manner.

  Prior to the adjustment operation described above, an appropriate capacitor capacity used for the charging operation according to the individual difference of the damper 13 is investigated in advance, and the appropriate capacitor capacity is realized in combination with the charging capacitor 17. The adjustment can be shortened by preparing a capacitor 20 for adjusting the capacity.

  Further, as described above, when the damper 13 having a large kinetic energy that can be absorbed is used, the charging speed becomes low, and it becomes difficult to achieve the breaking performance of opening the electrode immediately after loading and completing the breaking within 3 cycles. By using the method of increasing the capacitance of the capacitor used for the charging operation as in the embodiment, the waveform of the current supplied from the charging capacitor 17 and the capacitance adjusting capacitor 20 to the drive coil 10 becomes wider. Since the electromagnetic force immediately before the movable electrode 4 on which the damper 13 acts contacts the fixed electrode 3 increases, it becomes easy to achieve the blocking performance.

  Further, since the characteristics of the capacitor, such as capacitance, vary depending on the temperature, the temperature of the input capacitor 17 is measured using a temperature sensor, and the capacitance adjusting capacitor 20 to be connected is selected based on this temperature. It is also possible to obtain an electromagnetically operated vacuum circuit breaker 1 that does not change its operating characteristics due to ambient temperature or the like.

  In the above description, the method of replacing the capacitance adjusting capacitor 20 with a capacitor having a different capacitance has been shown. However, the charging speed can be adjusted by additionally connecting the capacitance adjusting capacitor 20 having the same capacitance. Also good.

  In the above description, the charging speed is adjusted by changing the capacitance of the capacitor used for charging. However, the charging voltage of the charging capacitor 17 and the capacitance adjusting capacitor 20 is changed, and the connection state of the capacitance adjusting capacitor 20 is changed. You may adjust both by changing.

Embodiment 4 FIG.
In the first embodiment, the configuration and the method for adjusting the current supplied to the driving coil 10 by changing the charging voltage of the charging capacitor 17 have been described. In the fourth embodiment, the driving coil used for charging is described. The number of turns of 10 is changed to adjust the magnetic flux density that drives the mover 11 in the closing direction.

  As shown in FIG. 11, in addition to the magnetic flux density adjusting unit 200 shown in FIG. 2, the magnetic flux density adjusting unit 200 of this embodiment includes a plurality of coaxial input coils 10a, 10b, 10c, and A drive coil connection switching unit 22 that switches connection with the operation board 9 is provided. Since the other configuration is the same as that of the first embodiment, the description thereof is omitted.

  FIG. 12 shows a flowchart for adjusting the magnetic flux density using the plurality of making coils 10a, 10b, 10c and the driving coil connection switching unit 22. First, in step S001, data relating to kinetic energy that can be absorbed by the damper 13, for example, catalog values of the adopted damper 13, characteristics measured in advance, and measurement data relating to chattering actually obtained by being incorporated in an electromagnetically operated vacuum circuit breaker. From the above, the kinetic energy that can be absorbed by the damper 13 to be applied is estimated, and if this estimated value is larger than the allowable range assumed in the design, go to step S302, and if it is within the allowable range, go to step S303. If it is smaller than the allowable range, the process proceeds to step S304.

  In steps S302 to S304, the charging capacitor 17 is charged using a charging voltage control circuit 9a (not shown) of the operation board 9, and an appropriate driving coil among the plurality of driving coils 10a, 10b, and 10c is used. Is connected to the operation board 9 by the drive coil connection switching unit 22 to adjust the density of the magnetic flux generated by the drive coil. Specifically, in step S302, all of the drive coils 10a, 10b, and 10c are connected in series to the operation board 9, and in step S303, the drive coils 10a and 10b are connected in series to the operation board 9. In S304, the driving coil 10b is connected to the operation board 9. Note that the total number of coil turns when the drive coils 10a and 10b are connected in series is configured to be the number of coil turns corresponding to the design center value. Steps S005 and S006 are the same as those in the first embodiment, and thus the description thereof is omitted.

  In step S007, the measurement result obtained in step S006 is evaluated. If the measurement result is within the allowable range, the charging voltage setting is stored in a storage device (not shown) in the operation board 9 and the process ends. If it is out of the allowable range, the process proceeds to step S308, where a new coaxial driving coil 10 having a different number of turns is selected based on the measurement result and the evaluation result, and the existing driving coil is selected. Replacement with any of 10a, 10b, and 10c is performed, and the adjustment of the newly attached drive coil 10 is performed again from step S001.

  In this way, when the kinetic energy that can be absorbed due to individual differences of the damper 13 is small, the number of turns of the driving coil 10 is reduced by using the plurality of input coils 10a, 10b, and 10c and the driving coil connection switching unit 22. Thus, the kinetic energy of the mover 11 can be increased by decreasing the kinetic energy of the mover 11 and increasing the number of turns of the driving coil 10 when the kinetic energy that can be absorbed by the individual differences of the dampers 13 is large. . In this way, since the input speed can be easily adjusted by switching the driving coils 10a, 10b, and 10c to be connected, not only during production but also after the product shipment, the electromagnetic operating device 100 and the damper 13 may deteriorate over time. Even if characteristics change due to contact wear, adjustment can be made in the same manner.

  Prior to the adjustment operation described above, the appropriate number of turns of the drive coil 10 according to the individual difference of the damper 13 is investigated in advance, and a plurality of drive coils 10 having different numbers of turns are prepared. Thus, the adjustment can be shortened.

  Further, as described above, when the damper 13 having a large kinetic energy that can be absorbed is used, the charging speed becomes low, and it becomes difficult to achieve the breaking performance of opening the electrode immediately after loading and completing the breaking within 3 cycles. As in the embodiment, by increasing the number of turns of the drive coil 10, the inductance of the drive coil 10 increases, and the waveform of the current discharged from the input capacitor and supplied to the drive coil 10 is wide. Thus, since the electromagnetic force immediately before the movable electrode 4 on which the damper 13 acts contacts the fixed electrode 3 increases, it is easy to achieve the blocking performance.

  In the above description, the case where the plurality of driving coils 10 are three is shown, but three or more may be used.

  In the above, the closing speed is adjusted by changing the number of turns of the driving coil 10 used for the closing operation. However, the change of the charging voltage of the charging capacitor 17 and the number of turns of the driving coil 10 are changed. You may adjust in both.

  Further, in addition to these, adjustment may be performed by appropriately combining the above-described adjusting means such as changing the capacitance of the capacitor used for charging and using the adjusting resistance device 19 together.

  DESCRIPTION OF SYMBOLS 1 Electromagnetic operation type circuit breaker, 2 Vacuum valve, 3 Fixed electrode, 4 Movable electrode, 5 Insulating rod, 6 Spring support, 7 Contact pressure spring, 8 Connecting rod, 9 Operation board, 9a Charging voltage control circuit, 10, 10a 10, 10b, 10c Driving coil, 11 Movable element, 12 Stator, 13 Damper, 14 Damper fixing plate, 15 Tank, 16 O-ring, 17 Capacitor for input, 18 Capacitor for opening, 19 Resistance device for adjustment, 20 Capacitance adjustment capacitor, 21 Capacitor connection switching unit, 22 Driving coil connection switching unit, 100 Electromagnetic operation device, 200 Magnetic flux density adjustment unit.

Claims (7)

A vacuum valve having a pair of contacts in the vacuum vessel;
An electromagnetic operating device having a drive coil and a mover, and driving one contact of the pair of contacts to the other contact to contact the pair of contacts;
A damper that absorbs kinetic energy at the time of the contact;
Based on the individual difference in kinetic energy that can be absorbed by the damper, the kinetic energy immediately before the pair of contacts abuts is generated in the drive coil to a value that satisfies both the cutoff performance and the performance to suppress chattering. solenoid-operated vacuum circuit breaker having a magnetic flux density adjusting unit to adjust the magnetic flux density Ru is. An electromagnetically operated vacuum circuit breaker according to claim 1,
The one contact is fixed to one end of the movable electrode,
The other end of the movable electrode is connected to the movable element via an insulating rod and a contact pressure spring,
The magnetic flux density adjustment unit, solenoid-operated vacuum circuit breaker to adjust the magnetic flux density by adjusting the current supplied to the driving coil. The electromagnetically operated vacuum circuit breaker according to claim 1 or 2,
The magnetic flux density adjustment unit includes a charging capacitor that supplies current to the driving coil, and a charging voltage control circuit that adjusts a charging voltage of the charging capacitor based on individual differences in kinetic energy that can be absorbed by the damper. An electromagnetically operated vacuum circuit breaker. The electromagnetically operated vacuum circuit breaker according to claim 1 or 2,
The magnetic flux density adjusting unit includes a charging capacitor for supplying a current to the driving coil, and an adjusting resistor device having a variable resistance value connectable between the charging capacitor and the driving coil. ,
An electromagnetically operated vacuum circuit breaker in which the resistance value of the adjusting resistance device can be adjusted based on individual differences in kinetic energy that can be absorbed by the damper. The electromagnetically operated vacuum circuit breaker according to claim 1 or 2,
The magnetic flux density adjusting unit is based on an input capacitor for supplying current to the driving coil, a capacity adjusting capacitor that can be connected in series or in parallel to the input capacitor, and an individual difference in kinetic energy that can be absorbed by the damper. An electromagnetically operated vacuum circuit breaker having a charging capacitor connection switching unit that can switch whether the capacitance adjusting capacitor is connected to the charging capacitor or not. The electromagnetically operated vacuum circuit breaker according to claim 1 or 2,
The magnetic flux density adjusting unit adjusts the magnetic flux density of the magnetic flux generated by the driving coil by changing the number of turns to be energized of the driving coil based on the individual difference of kinetic energy that can be absorbed by the damper. Electromagnetically operated vacuum circuit breaker having a coil connection switching part.   An electromagnetically operated vacuum circuit breaker according to claim 3,
The charging voltage control circuit adjusts the charging voltage of the charging capacitor based on the temperature of the charging capacitor.
Electromagnetically operated vacuum circuit breaker.

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