JP6438365B2 - Circuit breaker system - Google Patents

Description

  The present invention relates to a circuit breaker system, and more particularly to a circuit breaker system suitable for an apparatus using an electric motor as an operating device for opening and closing a circuit breaker in the circuit breaker.

  In general, as an operating device for operating a gas circuit breaker, there is a configuration using an electric motor that is directly or indirectly connected to a shut-off unit. For example, there is one described in Patent Document 1.

  In the case of using an electric motor as an operating device for operating the gas circuit breaker, the spring operating device or the point of improving the reliability of the operation such as high positioning accuracy of the electric motor or that the movable part is composed of simple and few parts. There are many advantages over hydraulic actuators.

  For this reason, in Patent Document 1 described above, in order to perform an efficient breaking operation, when the current value flowing through the main circuit conductor detected by the current detector is larger than the threshold value, the middle of the breaking operation or the breaking operation When the operation force at the end of the operation is increased and the current value flowing through the main circuit conductor detected by the current detector is smaller than the threshold value, the operation force at the initial operation of the interruption operation is increased to improve the operation characteristics in the interruption operation. By changing, it is described that various current interruption duties can be efficiently realized by the circuit breaker.

International Publication No. 2013/150930

  By the way, including the contents described in Patent Document 1, the circuit breaker needs to satisfy various current interruption duties in response to changes in the environment and the situation. In the conventional technology, the operation characteristics and operation timing of the circuit breaker are set. By changing, it corresponds to the environment and the situation.

  However, as in the prior art including Patent Document 1, by changing the operation characteristics and operation timing of the circuit breaker, when a failure or deterioration occurs in the circuit breaker or the motor constituting the gas circuit breaker, it is reliable. The current interruption duty may not be met. In other words, in order to discover abnormalities in components such as the circuit breakers and electric motors that make up the gas circuit breaker, regular maintenance must be performed. However, there is a problem that it is not always found.

  The present invention has been made in view of the above points, and the object of the present invention is to diagnose the soundness of the circuit breaker at the time of introduction or operation of the circuit breaker, and to detect abnormality of the components in the circuit breaker system from the diagnosis data. It is to provide a breaker system that can be detected.

  In order to achieve the above object, a circuit breaker system of the present invention includes an electric motor, a circuit breaker connected to the electric motor, and a power converter that drives the electric motor by converting DC power into AC power having an arbitrary frequency. A control unit for controlling the power converter, a measuring unit for measuring a current value in the operating state of the electric motor, and a current value in the operating state of the electric motor connected to the measuring unit and measured by the measuring unit Accelerating time during acceleration operation determined according to the current value in the operating state of the electric motor measured by the measuring unit at the time of breaking and closing command of the circuit breaker, and presetting The calculated value is compared by the calculation unit, and the calculation unit determines that the operation of the circuit breaker is abnormal when the acceleration time deviates from the determination value.

  ADVANTAGE OF THE INVENTION According to this invention, the soundness of a circuit breaker can be diagnosed at the time of introduction | transduction of a circuit breaker or operation | use, and the abnormality of the component of a circuit breaker can be detected from diagnostic data.

It is a block diagram which shows Example 1 of the circuit breaker system of this invention. It is a figure which shows the change of the position at the time of opening operation of the interruption | blocking part in Example 1 of the circuit breaker system of this invention, and speed. It is a figure which shows the three-phase current waveform of the electric motor at the time of opening operation of the interruption | blocking part in Example 1 of the circuit breaker system of this invention. It is a figure which shows the sum total waveform of the absolute value of the three-phase current at the time of opening operation of the interruption | blocking part in Example 1 of the circuit breaker system of this invention. It is a block diagram which shows Example 2 of the circuit breaker system of this invention. It is a figure which shows the sum total of the absolute value of each phase current in Example 1 of the circuit breaker system of this invention, and the absolute value waveform of a q-axis current component. It is a block diagram which shows Example 3 of the circuit breaker system of this invention. It is a figure which shows the detail of the connection structure of the electric motor and circuit breaker in the circuit breaker using an electric motor as Example 4 of the circuit breaker system of this invention.

  Hereinafter, the circuit breaker system of the present invention will be described based on the illustrated embodiment. In addition, in each Example, the same code | symbol is used for the same component.

  1 to 4 show a first embodiment of a circuit breaker system according to the present invention. The figure is an example of the circuit breaker 100 using the electric motor 30.

  As shown in FIG. 1, the circuit breaker 100 using the electric motor 30 in the circuit breaker system of the present embodiment includes an operating unit unit 90 having the electric motor 30 as a drive source, a circuit breaker 20 including fixed and movable contacts, and the like. The motor 30 and the connecting part 2 that connect the blocking part 20 to each other are schematically configured.

  For example, the connecting portion 2 is manufactured by processing an insulating material or a metal material, and the electric motor 30 is driven by a power converter 50. The power converter 50 is controlled by the control unit 60, and the power converter 50 and the control unit 60 are connected by a signal line 8. The control unit 60 can instruct the power converter 50 to operate the motor 30 at an arbitrary speed and force via the signal line 8. The power converter 50 can convert DC power into AC power having an arbitrary frequency and amplitude in accordance with a command from the control unit 60, and supply AC power to the motor 30 via the power line 4. The number of the power lines 4 is arbitrarily determined according to the application. In this embodiment, the number of the power lines 4 is set to three in order to pass a three-phase alternating current.

  The blocking unit 20 and the electric motor 30 connect the movable parts (for example, the insulating rod of the blocking unit 20 and the movable part of the linear motor) via the connecting unit 2. For this reason, the blocking unit 20 operates linearly according to the operation of the electric motor 30. The current waveform during the operation of the electric motor 30 is measured by the measuring device 40 that is a measuring unit via the probe 6 that detects the magnitude of the current. The measuring device 40 is, for example, an oscilloscope or a data logger.

  The current measurement value during operation of the electric motor 30 measured by the measuring instrument 40 is transmitted to the calculation unit 70 via the signal line 10, and the calculation unit 70 stores an internal recording device (not shown) for recording the current measurement value. ) And the recorded measurement values can be analyzed and calculated according to the method described later.

  Next, the operation | movement at the time of interruption | blocking of the circuit breaker 100 comprised as mentioned above is demonstrated.

  Usually, when the state of the power system is normal, the current of the power system flows through the power transmission line in the interrupting unit 20. On the other hand, when an abnormality occurs in the power system and an accident current flows, the circuit breaker 100 detects the accident current and electrically opens (opens) the fixed contact and the movable contact of the interrupting unit 20. For the operation. At this time, in this embodiment, when the electric motor 30 is operated, the blocking unit 20 is linearly operated, and the fixed contact and the movable contact are in an open state.

  FIG. 2 shows changes in the opening operation position S and the operation speed V of the fixed contact and the movable contact in the blocking unit 20 described above.

  In the drawing, the blocking unit 20 moves from the closing position C to the blocking position O during the opening operation, but after the operation command to the electric motor 30, the blocking unit 20 starts the blocking operation at time TS. When the blocking unit 20 moves to a preset distance, it reaches the opening position SO at time TO. From the opening position SO to the breaking position O, the movement is performed while maintaining a distance at which dielectric breakdown due to an accident current does not occur. When the breaking position O is reached at time TE, the breaking operation is stopped. On the other hand, the operating speed V of the blocking unit 20 becomes the maximum speed VT at the time TM. For this reason, the interruption | blocking part 20 becomes acceleration operation from the time TS to the time TM, and becomes deceleration operation from the time TM to the time TE.

  Next, a method for estimating the acceleration time in the electric motor 30 using the current measurement value will be described.

FIG. 3 shows a three-phase current waveform when the operating position S and the operating speed V of the interrupting unit 20 and the electric motor 30 are synchronized. In the figure, the horizontal axis indicates time, and I ₁ , I _2, and I ₃ indicate phase current waveforms, respectively.

The arithmetic unit 70 shown in FIG. 1 can store the magnitude and time of each phase current value I ₁ , I ₂ , I ₃ as numerical data in the internal recording device. The computing unit 70 calculates the absolute value of each phase current value I ₁ , I ₂ , I ₃ , and further calculates the sum IA of each phase current absolute value. In this embodiment, because of the three-phase current, the calculation formula is IA = | I ₁ | + | I ₂ | + | I ₃ |.

  However, the calculation method of the sum IA of the current absolute values of each phase is not limited to the above calculation formula. For example, when the currents of the phases are balanced, the simple sum is zero, so that the current value of a certain phase can be calculated as a negative number of the sum of the current values of the other phases. In addition, for any number of phases, the sum IA of the absolute values of the phase currents remains the sum of the absolute values of the phase currents.

  FIG. 4 shows a waveform of the sum IA of the absolute values of the respective phases described above.

  As shown in the waveform of the sum IA of the phase current absolute values in the figure, the magnitude IA of the phase current absolute values approaches zero at time TS, time TM, and time TE. Therefore, by calculating the time difference between the time TS and the time TM by the calculation unit 70, it is possible to calculate the acceleration time which is the time during the acceleration operation of the electric motor 30 and the shut-off unit 20.

  In this embodiment, an arbitrary threshold value IT set in advance is compared with the sum IA of each phase current absolute value described above, and the point where the sum IA of each phase current absolute value exceeds the threshold value IT first. Time T1 is defined as the point at which the sum IA of the absolute values of the respective phases exceeds the threshold value IT second by time T2. The threshold value IT is arbitrary in the range of 0 to the maximum current value IM. The acceleration time can be determined by calculating the difference between the time T1 and the time T2 by the calculation unit 70.

  The abnormality determination method in the present embodiment will be described below.

First, in the arithmetic unit 70 described above, the acceleration time is calculated for each phase current value input through the signal line 10 using the above formula (IA = | I ₁ | + | I ₂ | + | I ₃ |). Is calculated. The calculation unit 70 compares the acceleration time calculated here with a determination value (threshold value) preset in the calculation unit 70, and when the acceleration time deviates from the determination value (when the acceleration time is larger than the determination value or acceleration When the time is smaller than the determination value, it is determined that the operation of the circuit breaker 100 is abnormal.

  Here, the above-described determination value is calculated by the difference and sum of the acceleration time variation TD of the same configuration with the average value of the acceleration time in the configuration of the circuit breaker 100 using the electric motor 30 as the center value TC. That is, the upper limit TH of the determination value is TH = TC + TD. Further, the lower limit TL of the determination value is TL = TC−TD.

  The acceleration time center value TC and the acceleration time variation TD are constant as long as the load on the controller unit 90 does not fluctuate, and can be obtained from the analysis of the experimental results by repeating the operation test under the same conditions. is there.

  When the calculation unit 70 in this embodiment determines an abnormality, the calculation result of the abnormal state is provided to a device having a function of notifying an abnormal state by display or sound or notifying information to the outside by display or sound. Has a function of outputting. Furthermore, the calculation unit 70 can continue to arbitrarily accumulate the abnormality determination result as long as it falls within the capacity of the internal recording device. The information recorded in the calculation unit 70 can be freely output at any time.

  By adopting such a configuration of the present embodiment, it is possible to diagnose the soundness of the circuit breaker 100 using the electric motor 30 at the time of introduction or operation, and the operation reliability of the entire system in which the circuit breaker 100 is incorporated. It is possible to improve the sex. Moreover, it is possible to examine the cause of failure and the degree of deterioration of the device from the history of the abnormality determination data, which is effective in simplifying maintenance and reducing operation costs due to a decrease in frequency.

  Therefore, according to the present embodiment, the soundness of the circuit breaker can be diagnosed at the time of introduction or operation of the circuit breaker 100, and the abnormality of the components of the circuit breaker 100 can be notified from the diagnosis data.

  In addition, although the abnormality determination shown in the present embodiment has been described with respect to the operation when the blocking unit 20 is shut off, it is needless to say that the operation when the blocking unit 20 is turned on can also be applied in the same manner.

  5 and 6 show a second embodiment of the circuit breaker system of the present invention.

  The circuit breaker 200 using the electric motor 30 in the circuit breaker system of the present embodiment shown in the figure is substantially the same as the structure of the first embodiment, and therefore detailed description thereof is omitted here.

  In the present embodiment shown in the figure, the configuration is substantially the same as that of the circuit breaker 100 using the electric motor 30 shown in the first embodiment. However, in the operating unit unit 90 shown in FIG. A current detector 80 serving as a measurement unit is provided between the two, and a signal path 82 for transmitting the magnitude of each phase current detected by the current detector 80 to the control unit 60 is provided. An arithmetic unit 70 is connected to the control unit 60 via the signal line 10. That is, the current detector 80 is connected to the calculation unit 70 via the control unit 60.

  The calculation unit 70 and the control unit 60 can input / output at least one of information signals such as measured values of the respective phase currents. The calculation unit 70 uses the motor 30 from at least one of the input information signals. 200 abnormality determinations are possible.

  That is, in this embodiment, the current detector 80 measures the magnitude of the current supplied to the electric motor 30 when the circuit breaker 200 is shut off and turned on, and the calculation unit 70 determines from at least one of the input current information signals. The acceleration time during the acceleration operation determined according to the current value in the operation state of the electric motor 30 is calculated, and the acceleration time is compared with a predetermined determination value by the calculation unit 70. When the value deviates from the preset determination value (when the acceleration time is larger than the determination value or the acceleration time is smaller than the determination value), the operation of the circuit breaker 200 is determined to be abnormal.

  In general current control of an electric motor, a method is used in which a current is determined by a command from a controller, a current detection value is fed back to the controller, and a next command is determined by the current feedback value. That is, the configuration excluding the calculation unit 70 described in the present embodiment is widely used. By connecting the calculation unit 70 to such a configuration, the operation unit 92 having an abnormality determination function can be easily realized. .

  In addition, when the control unit 60 uses vector control that separates and controls the current of the motor 30 into a q-axis current component that contributes to torque or thrust and a d-axis current component that is orthogonal thereto, the absolute value of the q-axis current component is used. As shown in FIG. 6, the sum IA of the value IQA and the absolute value of each phase current has a similar waveform at time TS, time TM, and time TE at a point approaching zero. For this reason, as in the first embodiment, the acceleration time is calculated from the absolute value IQA by comparing with the threshold value IT, and abnormality determination is possible.

  According to the configuration of this embodiment, the same effect as that of Embodiment 1 can be obtained, and since the existing configuration is adopted except for the calculation unit 70, a measuring instrument and a current detector are newly installed. Since it is not necessary to add, the circuit breaker 200 having the abnormality determination function can be configured at a lower cost than the first embodiment. Furthermore, the use of the absolute value IQA of the q-axis current component is useful because the calculation load required for the calculation of each phase current by the calculation unit 70 can be reduced.

  FIG. 7 shows a second embodiment of the circuit breaker system of the present invention.

  The circuit breaker 300 using the electric motor 30 in the circuit breaker system of the present embodiment shown in the figure has substantially the same configuration as that of the first embodiment, and thus detailed description thereof is omitted here.

  In the present embodiment shown in the figure, the configuration is substantially the same as that of the circuit breaker 100 using the electric motor 30 shown in the first embodiment. However, in the operating unit unit 90 shown in FIG. A current detector 80 is provided between them, and the magnitude of each phase current detected by the current detector 80 is transmitted to the control unit 60 and the calculation unit 70 via the signal path 84. That is, the current detector 80 is separately connected to the control unit 60 and the calculation unit 70, and the magnitude of each phase current detected by the current detector 80 is transmitted to the control unit 60 and the calculation unit 70 via the signal path 84. It is the structure transmitted independently.

  The calculation unit 70 and the control unit 60 can input / output at least one of information signals such as measured values of the respective phase currents. The calculation unit 70 uses the motor 30 from at least one of the input information signals. 300 abnormality determinations are possible.

  That is, in this embodiment, the current detector 80 measures the magnitude of the current supplied to the electric motor 30 when the circuit breaker 300 is shut off and turned on, and the calculation unit 70 determines from at least one of the input current information signals. The acceleration time during the acceleration operation determined according to the current value in the operation state of the electric motor 30 is calculated, and the acceleration time is compared with a predetermined determination value by the calculation unit 70. When the value deviates from a predetermined determination value (when the acceleration time is larger than the determination value or the acceleration time is smaller than the determination value), the operation of the circuit breaker 300 is determined to be abnormal.

  According to such a configuration of the present embodiment, the same effects as those of the first embodiment can be obtained, and even if the control unit 60 fails during operation of the operation unit 94, the calculation unit 70 Since they are independent, it is possible to determine abnormality from the magnitude of each phase current detected by the current detector 80. Thereby, the operation reliability of the circuit breaker 300 using the electric motor 30 is improved. Moreover, if it is such a structure, since it is needless to say about the malfunction of the control part 60, since the abnormality command of an electric current will generate | occur | produce, acceleration time can be calculated by the same method and abnormality determination is possible.

  In FIG. 8, the detail of the connection structure of the electric motor 30 and the interruption | blocking part 20 in the circuit breaker 400 using the electric motor 30 is shown as Example 4 of the circuit breaker system of this invention.

  The present embodiment shown in the figure is an example in which a linear motor is used as the electric motor 30.

  Hereinafter, the details of the connection configuration of the motor 30 and the blocking unit 20 in the example in which a linear motor is used as the motor 30 will be described.

  As shown in FIG. 8, an electric motor (linear motor) 30 includes a mover unit 32 and a stator unit 34, and the mover unit 32 incorporates a permanent magnet that is a field that generates a static magnetic field. The unit 34 has a built-in coil for energizing AC power supplied from the magnetic flux path and the power converter 50 made of a magnetic material.

  In the electric motor (linear motor) 30 of this embodiment, the mover unit 32 operates under the influence of the magnetic field produced by the stator unit 34, and the mover unit 32 and the stator unit 34 move relatively linearly. The driving direction of the electric motor (linear motor) 30 at this time is the Z direction.

  Further, the stator unit 34 is provided with a position sensor 86 (corresponding to the measuring instrument 40 of the first embodiment) that detects a change in the relative position of the mover unit 32. The mover unit 32 includes a mover. Is provided with a thrust sensor 88 (corresponding to the measuring instrument 40 of the first embodiment) for measuring the force acting on the motor. The detection information of the position sensor 86 and the thrust sensor 88 is transmitted to the calculation unit 70 and the control unit 60 shown in FIG.

On the other hand, the blocking unit 20 is disposed in a sealed metal container 26 filled with SF ₆ gas inside, and a fixed side electrode 24 fixed relative to the sealed metal container 26, and the fixed side electrode 24. The movable side electrode 22 and the movable side contactor 28 that contacts the fixed side electrode 24 are provided. The fixed side electrode 24 and the movable side electrode 22 are connected to the power system via the movable side contactor 28. AC power is supplied from the high voltage conductor 150.

The connecting portion 2 that connects the electric motor (linear motor) 30 and the shut-off portion 20 passes through the linear seal 21 provided in the sealed metal container 26 and is fixed to the mover unit 32 and the movable contact 28. . The linear seal 21 is sealed even when the movable element unit 32 operates the movable contact 28 in the Z direction through the connecting portion 2 in order to prevent the SF ₆ gas in the sealed metal container 26 from leaking out of the container. The hermeticity of the metal container 26 is maintained.

  Next, the calculation method of the acceleration time in a present Example is demonstrated.

  When the electric motor (linear motor) 30 is operated, the operating speed V is calculated by taking the time difference over the entire operating distance from the operating position S (see FIG. 2) of the blocking unit 20 which is detection information of the position sensor 86. can do. Furthermore, the motion acceleration A can be calculated by taking the time difference of the motion speed V. The absolute value of the motion acceleration A with respect to the motion time has a waveform as shown in FIG. Therefore, the acceleration time can be obtained by comparing the motion acceleration A with an arbitrary threshold value AT.

  Further, when the electric motor (linear motor) 30 is operated, from the operating force F that is the detection information of the thrust sensor 88, the movable part mass M is determined from the mass of the movable unit 32 and the mass of the parts fixed to the movable unit 32. When the sum is taken, the motion acceleration A can be calculated by dividing the motion force F by the movable part mass M. The absolute value of the motion acceleration A with respect to the motion time has a waveform as shown in FIG. Therefore, the acceleration time can be obtained by comparing the motion acceleration A with an arbitrary threshold value AT.

  In addition, the abnormality determination method in the present embodiment is substantially the same as the content described in the first embodiment.

  According to the configuration of the present embodiment, since the electric motor 30 is a linear motor, the operation direction is the same as that of the blocking unit 20, and rotational translation conversion is not necessary as compared with the case where the rotary motor is handled as the electric motor 30. Therefore, the mechanism of the connecting portion 2 is simple. Moreover, since the mechanism is simplified and the number of parts is reduced, the reliability and maintainability of the entire circuit breaker are improved.

  In addition, since acceleration time can be obtained from various sensors, even if a malfunction occurs in one sensor, it is possible to determine an abnormality using another sensor. Improves.

  In the embodiment described above, an example in which the electric motor 30 is a linear motor has been described. However, the electric motor 30 may be a rotary translation exchange mechanism that converts a rotary motion into a linear motion.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. That is, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 2 ... Connection part, 4 ... Power line, 6 ... Probe, 8, 10 ... Signal line, 20 ... Blocking part, 21 ... Linear seal, 22 ... Movable side electrode, 24 ... Fixed side electrode, 26 ... Sealed metal container, 28 ... Movable side contact, 30 ... motor, 32 ... mover unit, 34 ... stator unit, 40 ... measuring instrument, 50 ... power converter, 60 ... control unit, 70 ... calculation unit, 80 ... current detector, 82, 84 ... Signal path, 86 ... Position sensor, 88 ... Thrust sensor, 90, 92, 94 ... Operator unit, 100, 200, 300, 400 ... Circuit breaker, 150 ... High voltage conductor.

Claims (10)

An electric motor, a circuit breaker connected to the electric motor, a power converter that converts the DC power into AC power of an arbitrary frequency and drives the motor, a control unit that controls the power converter, and the motor A measurement unit that measures a current value in an operating state, and a calculation unit that is connected to the measurement unit and that transmits a current value in the operating state of the electric motor measured by the measurement unit;
The calculation unit compares the acceleration time during the acceleration operation determined according to the current value in the operating state of the electric motor measured by the measurement unit and the preset determination value at the time of breaking and closing command of the circuit breaker In the circuit breaker system, the operation unit determines that the operation of the circuit breaker is abnormal when the acceleration time deviates from the determination value. The circuit breaker system according to claim 1, wherein
When the operation of the circuit breaker is determined to be abnormal, the arithmetic unit notifies the abnormal state or outputs the determination result of the abnormal state to a device having a function of notifying information to the outside. Breaker system featuring. The circuit breaker system according to claim 1 or 2,
The measurement unit is a measurement device disposed between the electric motor and the calculation unit, and a current waveform during operation of the electric motor is measured by the measurement device via a probe that detects the magnitude of the current. A circuit breaker system characterized by that. The circuit breaker system according to claim 3,
The current measurement value during operation of the electric motor measured by the measuring instrument is transmitted to the calculation unit via a signal line, and the calculation unit has an internal recording device for recording the current measurement value. A circuit breaker system, wherein the current measurement value recorded in the internal recording device is analyzed and calculated. The circuit breaker system according to claim 4.
The arithmetic unit calculates the absolute value of the three-phase current value when the operating position and the operating speed of the motor are synchronized with the circuit breaker of the circuit breaker, and the sum (IA) of each phase current absolute value Circuit breaker system characterized by calculating The circuit breaker system according to claim 5,
The arithmetic unit compares an arbitrary threshold value (IT) set in advance with the sum (IA) of the absolute values of the phase currents, and the sum (IA) of the absolute values of the phase currents sets the threshold (IT). When the point first exceeded is time T1, and the point where the sum (IA) of each phase current absolute value exceeds the threshold (IT) second is time T2, the time T1 and time T2 The circuit breaker system characterized in that the acceleration time is calculated by calculating a difference in the calculation unit. The circuit breaker system according to claim 1, wherein
When the average value of the acceleration time in the circuit breaker is a center value (TC) and the variation in the acceleration time (TD) in the circuit breaker is determined, the determination value is the center value (TC) of the acceleration time. Breaker system characterized by being calculated by sum or difference with variation (TD). The circuit breaker system according to claim 1 or 2,
The measurement unit is a current detector disposed between the electric motor and the power converter, the current detector is connected to the arithmetic unit via the control unit, and the current detector is the circuit breaker Measure the magnitude of the current supplied to the electric motor at the time of shutting off and turning on, and the arithmetic unit calculates the acceleration time from at least one of the information signals of the input current, and the acceleration time and the preset The circuit breaker system characterized in that the operation value of the circuit breaker is determined to be abnormal when the acceleration time deviates from the determination value. The circuit breaker system according to claim 1 or 2,
The measurement unit is a current detector disposed between the electric motor and the power converter, the current detector is separately connected to the control unit and the calculation unit, and the current detector is the circuit breaker Measure the magnitude of the current supplied to the electric motor at the time of shutting off and turning on, and the arithmetic unit calculates the acceleration time from at least one of the information signals of the input current, and the acceleration time and the preset The circuit breaker system characterized in that the operation value of the circuit breaker is determined to be abnormal when the acceleration time deviates from the determination value. The circuit breaker system according to any one of claims 1 to 9,
The circuit breaker system, wherein the electric motor is a linear motor.

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