JP5225198B2 - Status monitoring device for switchgear or electromagnetic operating device - Google Patents

Description

  The present invention relates to a state grasping device that estimates a state quantity of a switchgear or an electromagnetic operating device when the switchgear is operated by an electromagnetic operating device, such as a consumption amount of a switching contact of a vacuum circuit breaker.

  A conventional electromagnetic operating device of a switchgear moves a mover (movable iron core) inside the electromagnetic operating device by passing a current through a coil for opening or closing the electromagnetic operating device. The movable element of the electromagnetic operating device is connected to an electrical contact of the switching device, and an opening / closing operation is performed in accordance with the operation of the electromagnetic operating device (for example, Patent Document 1). The electromagnetic operating device and the electrical contact are mechanically connected by a mover or a drive shaft. Operation of movable parts such as a mover and a drive shaft is guided by bearings. Friction is generated at a portion where the movable portion and the fixed portion such as a bearing are in contact with each other, thereby preventing a smooth operation of the movable portion. For this reason, grease is applied to the contacted part and a low friction member is applied. However, it is conceivable that the frictional force increases due to deterioration of the grease characteristics over time, corrosion of the members used, rust, contamination with foreign matter, and the like.

  In addition, there is a possibility that the electrical contacts may be worn out due to interruption of the accident current or operation of the switchgear for a long time. In order to ensure the reliability of the operation of the switchgear, the amount of state of the switchgear or electromagnetic operating device, such as the increase in frictional force and the amount of contact consumption, is regularly monitored and constantly used with sensors. It is measured by the monitoring means, and it is verified that the measured state quantity is within the reference range. In addition, as a method for constantly monitoring the state quantity of the switchgear, it is possible to grasp the state by estimating the state quantity of the switchgear or electromagnetic operating device from the change in the current waveform when the opening or closing coil of the electromagnetic operating device is energized. A device has been devised. (For example, Patent Document 2)

Japanese National Patent Publication No. 3-502021 International Publication No. WO2005 / 111164

  In the state grasping device for estimating the state quantity of the switching device or electromagnetic operating device from the change in the current waveform when the coil for opening or closing the electromagnetic operating device is energized, the mechanical of the switching device or electromagnetic operating device The state quantity of the switchgear or electromagnetic operating device can be calculated from the change in the coil current waveform for opening or closing using the change in the current waveform flowing in the coil for opening or closing due to the change in state. presume. However, since the resistance value of the opening or closing coil varies depending on the coil temperature, the current waveform of the opening or closing coil varies depending on the coil temperature. When the energizing current to the opening or closing coil is generated by discharging the charge charged in the capacitor, the capacitance of the capacitor and the internal resistance of the capacitor fluctuate depending on the capacitor temperature. The current waveform of the pole or closing coil varies.

  Therefore, a change in the current waveform of the opening or closing coil caused by a change in the mechanical state of the switchgear or electromagnetic operating device, and an opening caused by fluctuations in the coil resistance value, capacitor capacitance, or capacitor internal resistance value. It is necessary to separate the change in the current waveform of the working or closing coil. For this purpose, the ambient temperature is usually measured with a temperature sensor installed in the vicinity of the coil or capacitor, and the temperature correction value of the coil resistance value, capacitor capacitance, capacitor internal resistance value is calculated using this temperature, Based on these temperature-corrected coil resistance value, capacitor capacitance, and capacitor internal resistance value, the state quantity of the switchgear or electromagnetic operating device is corrected.

  However, actually, since the coil and the capacitor have a heat capacity, there is a temperature difference between the ambient temperature and the temperature of the coil and the capacitor, resulting in a temperature correction error, which increases the error of the estimated value of the state quantity. In addition, when the temperature sensor is directly attached to the coil body and the capacitor body, there is no temperature error, but a plurality of sensors are required, which increases the cost. There is also a method of applying a minute current to the opening or closing coil and calculating the coil resistance value from the current value and the voltage at both ends of the coil. However, a separate energization control circuit is required. In this case, the cost also increases.

  The present invention has been made in order to solve the above-described problems, and is capable of accurately correcting the state quantity estimation of the switchgear or electromagnetic operating device by temperature without providing a temperature sensor. The state grasping device is obtained.

  The state grasping device of the switchgear or electromagnetic operating device according to the present invention includes a fixed iron core, a movable iron core configured to be movable with respect to the fixed iron core, and being moved by moving the movable iron core excited by a driving power source. An electromagnetic operating device comprising an electromagnetic coil for opening and closing an opening and closing device connected to a movable iron core, a current sensor for measuring a current flowing through the electromagnetic coil, and a current measured by the current sensor at an interval A / A first A / D converter that performs D conversion, a memory that stores current value data A / D converted by the first A / D converter as current time-series data, and a voltage generated in the electromagnetic coil is measured. A voltage sensor, a second A / D converter for A / D converting the voltage measured by the voltage sensor at a constant time interval, and voltage value data A / D converted by the second A / D converter, A memory for storing pressure time-series data; and a search means for analyzing current time-series data stored in the memory and obtaining change information of the time-series data, and based on the change information from the search means, A state grasping device for estimating a state quantity of an electromagnetic operating device, wherein a resistance value of the electromagnetic coil is determined from the current time series data and the voltage time series data, and the state quantity of the switching device or the electromagnetic operating device is corrected. To do.

  Further, the state grasping device of the switchgear or electromagnetic operating device according to the present invention includes a fixed iron core, a movable iron core configured to be movable with respect to the fixed iron core, and the movable iron core moved by being excited by a charging voltage of a capacitor. An electromagnetic operating device comprising an electromagnetic coil that opens and closes an opening and closing device connected to the movable iron core, a current sensor that measures a current flowing through the electromagnetic coil, and a current measured by the current sensor at a predetermined time interval A first A / D converter that performs A / D conversion at a time, a memory that stores current value data A / D converted by the first A / D converter as current time-series data, and a voltage generated in the electromagnetic coil A voltage sensor for measuring the voltage, a second A / D converter for A / D converting the voltage measured by the voltage sensor at regular time intervals, and A / D converted by the second A / D converter A memory for storing pressure value data as voltage time-series data, and a search means for analyzing the current time-series data and the voltage time-series data stored in the memory and obtaining change information of the time-series data, A state grasping device that estimates the state of the switchgear or electromagnetic operating device based on change information from a search means, wherein the capacitance of the capacitor is determined from the current time-series data, the voltage time-series data, and the charging voltage of the capacitor. The capacitance C and the internal resistance value Rc are determined, and the state quantity of the switchgear or electromagnetic operating device is corrected using the determined capacitance C and internal resistance value Rc of the capacitor.

According to the state grasping device of the switchgear or electromagnetic operation device of the present invention, the resistance value of the electromagnetic coil is determined from the current time series data and voltage time series data when the electromagnetic coil is energized, and the state of the switchgear or electromagnetic operation device is determined. Since the amount is corrected, it is not necessary to install a temperature sensor.
Further, the capacitance C and the internal resistance value Rc of the capacitor are determined from the current time series data, the voltage time series data and the charging voltage of the capacitor, and the determined capacitance C and the internal resistance value Rc of the capacitor are used. Thus, since the state quantity of the opening / closing device or the electromagnetic operation device is corrected, it is not necessary to install a temperature sensor.

It is a block diagram which shows the opening state of the electromagnetic operating device which drives the switchgear in Embodiment 1 of this invention. It is a block diagram which shows the closing state of the electromagnetic operating device which drives the switchgear in Embodiment 1. FIG. 3 is a configuration diagram showing the electromagnetic operating device in the first embodiment in more detail. FIG. 3 is a configuration diagram illustrating in detail a power supply operation circuit according to the first embodiment. In Embodiment 1, it is explanatory drawing which shows the current waveform of the coil for closing, and the stroke waveform of a needle | mover. FIG. 3 is a configuration diagram showing a state grasping unit in the first embodiment. FIG. 6 is a simplified electrical circuit diagram in which a current flowing in the range of time t in FIG. 5 can be expressed as a current flowing in the simplified electrical circuit.

Embodiment 1 FIG.
1 is a block diagram showing an electromagnetic operating device for driving an opening / closing device according to Embodiment 1 of the present invention. First, the structure of the vacuum circuit breaker as a switchgear will be described. FIG. 1 shows an open state of a vacuum circuit breaker (vacuum valve). The vacuum valve 30 accommodates a fixed electrode 33 and a movable electrode 34 disposed at a predetermined distance from the fixed electrode 33 in a vacuum container. The movable electrode 34 is connected to the connecting rod 9 of the electromagnetic operating device 1 through the insulating member 31 and the contact pressure spring 32. The connected vacuum valve 30 and the electromagnetic operating device 1 are arranged in parallel at a predetermined interval for three phases (not shown). A power operation circuit 20 is connected to the electromagnetic operation device 1, and a current is supplied from the power operation circuit 20 to the electromagnetic operation device 1 in response to an external command (open / close command signal). 1 is shifted from the open state to the closed state, or from the closed state to the open state. In FIG. 1, the electromagnetic operating device 1 is stationary at the opening position, and the contact pressure spring 32 is in an extended state. Reference numeral 21 is a closing capacitor, 22 is an opening capacitor, and 40 is a state grasping unit.

  In contrast to the open circuit state of the vacuum circuit breaker of FIG. 1, FIG. 2 shows the closed state of the vacuum circuit breaker. At this time, the electromagnetic operating device 1 is stationary at the closed position, the fixed electrode 33 and the movable electrode 34 of the vacuum valve 30 are in electrical contact, and the main circuit current can be energized. Yes. At this time, the contact pressure spring 32 is compressed by a predetermined amount, and the movable electrode 34 is pressed against the fixed electrode 33 by the repulsive force of the contact pressure spring 32.

  FIG. 3 is a configuration diagram showing the electromagnetic operating device 1 in the first embodiment in more detail. The electromagnetic operating device 1 includes a closing coil (electromagnetic coil) 2a, an opening coil (electromagnetic coil) 2b, a mover (movable iron core) 3, a yoke (fixed iron core) 4, a permanent magnet 5, and a mover 3. It is composed of connected connecting rods 9. The closing coil 2a and the opening coil 2b are electrically connected to the power operation circuit 20, and in response to an open / close command signal from the outside, from the power operation circuit 20, the closing coil 2a or A current is applied to the opening coil 2b from the driving power supply.

  Next, the switching operation of the circuit breaker (vacuum valve 30) and the electromagnetic operating device 1 will be described. As shown in FIG. 1, when the vacuum valve 30 is in the open state, the mover 3 is stationary while being in contact with the lower side of the yoke 4. At this time, the magnetic flux produced by the permanent magnet 5 generates a force that pushes the mover 3 downward in the drawing along a path that passes from the side surface of the mover 3 to the lower surface, enters the yoke 4 and returns to the permanent magnet 5 again. Thereby, the electromagnetic operating device 1 maintains an open state. On the other hand, when the vacuum valve 30 is in a closed state as shown in FIG. 2, the mover 3 is stationary while being in contact with the upper side of the yoke 4. At this time, the magnetic flux generated by the permanent magnet 5 generates a force that presses the mover 3 upward in the figure along a path that passes from the side surface of the mover 3 to the upper surface, enters the yoke 4 and returns to the permanent magnet 5 again. As a result, the electromagnetic operating device 1 maintains a closed state.

  FIG. 4 is a configuration diagram showing in detail the power supply operation circuit 20 according to the first embodiment. The power supply operation circuit 20 normally opens the discharge switch 25a to the closing coil 2a and the discharge switch 25b to the opening coil 2b, while the charging switch 26 is closed. Yes. Therefore, the closing capacitor 21 and the opening capacitor 22 are charged to a constant charging voltage preset by the charging control circuit 27. When a closing command signal is input to the power operation circuit 20, the power operation circuit 20 opens the charging switch 26, closes the discharge switch 25a, and converts the charge charged in the closing capacitor 21 into the closing coil 2a. The current is passed through the closing coil 2a. The current value that is passed through the closing coil 2 a is measured by the current sensor 23. The voltage sensor 24 measures the voltage across the closing coil 2a. The measured signal is sent to the state grasping unit 40.

  The current sensor 23 may be located at any position in the circuit that returns from the positive electrode of the closing capacitor 21 to the negative electrode of the closing capacitor 21 through the closing coil 2a. It may be outside the power supply operation circuit 20. Further, the voltage sensor 24 may be at any position in the above circuit as long as the voltage at both ends of the closing coil 2 a can be measured, or may be outside the power supply operation circuit 20. Further, although the current flowing in the opening or closing coil is described as the discharge current of the capacitor, it may be supplied from a constant voltage source.

  When moving from the open state to the closed state, the magnetic flux generated when the closing coil 2a is energized passes from the lower surface of the mover 3 to the upper surface of the mover 3 with reference to FIG. Then, a path is formed again through the yoke 4 and back to the mover 3, and a magnetic flux in a direction opposite to the magnetic flux generated by the permanent magnet 5 is generated on the lower surface of the mover 3. When the value of the current applied to the closing coil 2a increases, the magnetic flux generated by the closing coil 2a also increases, canceling out the magnetic flux generated by the permanent magnet 5, and reducing the downward attractive force of the mover 3. To lose. Further, when the magnetic flux generated by the closing coil 2a increases, the mover 3 receives an upward attractive force, and the mover 3 moves upward. After the mover 3 has moved upward, the mover 3 comes to rest in contact with the yoke 4. At this time, the magnetic flux generated by the permanent magnet 5 is in the direction from the side surface of the mover 3 to the upper surface of the mover 3, and is in the same direction as the magnetic flux generated by the closing coil 2a. Even after the supply of current from the power supply operation circuit 20 is stopped, the mover 3 is attracted upward in the figure by the magnetic flux generated by the permanent magnet 5, and the closed state is maintained.

  Further, also when moving from the closed state to the open state, the movable element 3 moves downward by the same description with reference to FIG. 2 and maintains the open state. In the above description, the direction of the magnetic flux generated by the permanent magnet 5 and the closing coil 2a is defined as one direction for convenience, but the same operation can be obtained even if all the directions of the magnetic flux are reversed.

  FIG. 5 shows the time change (solid line) of the current value flowing through the closing coil when the vacuum circuit breaker is moved from the open state to the closed state in Embodiment 1, and the movement in the electromagnetic operating device. The change with time of the child displacement (broken line) is shown. Immediately after energization from the closing capacitor 21 to the closing coil 2a is started, the coil current value starts to gradually increase. As described above, when the closing coil 2a is energized, a magnetic flux that cancels out the magnetic flux of the permanent magnet 5 that maintains the open state is generated. Holding of the open state by the magnet 5 continues, and the mover 3 does not operate. When the coil current increases sufficiently, the electromagnetic force of the closing coil 2a overcomes the opening holding force of the permanent magnet 5, and the mover 3 starts to move. The inflection point (time) of the current waveform at this time is detected by the mover operation start point search means 44 (FIG. 6). (Indicated in the figure as the start of the mover operation). The inflection point corresponds to a point where the current waveform, that is, the first derivative of the current-time characteristic I (t) is zero, or the first or second derivative is discontinuous.

  When the mover 3 starts to move, the magnetic flux interlinking the closing coil 2a changes as the mover 3 moves, and an induced electromotive force is generated in the closing coil 2a. As the speed of the mover 3 increases, the induced electromotive force also increases. As a result, the current flowing through the closing coil 2a is limited, and the energization current value decreases. When the mover 3 moves to the closing position and stops, the induced electromotive force disappears, and the current flowing through the closing coil 2a starts to increase again. The minimum current point (time) at this time is detected by the mover operation completion point search means 45 (FIG. 6). (Indicated in the figure as completion of mover operation)

  FIG. 6 is a configuration diagram showing a state grasping unit in the first embodiment. In the state grasping unit 40, the current signal and the voltage signal measured by the current sensor 23 and the voltage sensor 24 are input to the A / D converter 41, and the A / D converter 41 receives the current signal and the voltage signal. Are A / D converted at regular time intervals. The data converted into digital values is stored in the memory 42 as current time series data and voltage time series data. The state grasping unit 40 further includes a mover operation start point searching unit 44 and a mover operation completion point searching unit 45.

  After the opening / closing operation of the vacuum circuit breaker is completed, the mover operation start point searching means 44 and the mover operation completion point searching means 45 read the time series data stored in the memory 42 and obtain the current time series data and the voltage time series data. Analysis is performed to calculate a mover operation start point (time) and a mover operation completion point (time) which are state quantities of the electromagnetic operating device. The mover operation start point searching means 44 and the mover operation completion point searching means 45 are realized by a CPU.

  As described above, since the current flowing in the closing coil 2a is limited by the speed of the movable element 3, the mechanical state of the movable part of the vacuum circuit breaker (vacuum valve 30) varies, and the movable part If there is a change in the operating characteristics, changes corresponding to the current time series data also appear. In the state grasping unit 40, the state of the circuit breaker is quantitatively estimated from such fluctuations in the current time series data and the voltage time series data, and when the state quantity becomes abnormal or tends to approach the abnormality An alarm is generated.

However, the current time series data may fluctuate due to factors other than the mechanical state change of the movable part of the vacuum circuit breaker. Examples of the fluctuation factors of the current time-series data other than the mechanical state change include the resistance value of the closing coil 2a, the capacitance of the capacitor 21, and the internal resistance value of the capacitor 21. The closing coil 2a is made of a highly conductive metal wire such as copper or aluminum, and has a resistance value corresponding to each metal material and a temperature coefficient of the resistance value. In the case of a commonly used copper material, the standard temperature coefficient is 4.3 × 10 ⁻³ / ° C., and the resistance value varies by 4.3% with a temperature change of 10 ° C. The power switchgear may be used outdoors, and is assumed to be used in a temperature range of about −20 ° C. to 50 ° C. as a fluctuation range of the outside air temperature.

  Therefore, the coil resistance value of the closing coil 2a may vary by about ± 16%. Capacitor capacitance also has temperature characteristics, but the characteristics vary greatly depending on the type of capacitor used. In the case of an aluminum electrolytic capacitor that is often used for operation of an electromagnetic operating device, the capacity decreases with a decrease in temperature, and a change in capacity of about 1% per 10 ° C. is assumed. The capacitor internal resistance value (ESR) also depends on temperature, and an aluminum electrolytic capacitor has a characteristic that the internal resistance value increases nonlinearly at low temperatures. In addition, changes in the capacitance and internal resistance value of the capacitor may occur due to deterioration of the capacitor over time.

  As described above, the current time series data flowing in the closing coil 2a fluctuates due to the mechanical state change of the movable part of the switchgear, but at the same time also due to the change of the temperature of the switchgear and the aging characteristics of the capacitor. fluctuate. Therefore, in order to quantitatively derive the mechanical state change of the movable part of the switchgear from the current time series data flowing in the closing coil 2a, the fluctuation of the current time series data due to the temperature fluctuation and the aging of the capacitor The factor needs to be removed.

  In the current waveform that flows in the closing coil 2a in FIG. 5 during closing, since the mover 3 does not operate for a time t after the energization of the closing coil 2a is started, the current that flows in the closing coil 2a. Does not include the influence of the mechanical state change of the movable part of the switchgear. FIG. 7 is a simplified electric circuit diagram in which the current flowing in the closing coil 2a in the range of time t in FIG. 5 can be expressed as the current flowing in the simplified electric circuit. The coil (electromagnetic coil) has a resistance value R and self-inductance L, and the capacitor (capacitor for closing or opening) has an electrostatic capacitance C and an equivalent series resistance (internal resistance value) Rc. The voltage is V.

  Therefore, from the time series data of the current flowing through the closing coil 2a, immediately after the closing coil 2a is energized from the closing capacitor 21 to immediately before the mover 3 starts moving, Since the mover 3 is in a stopped state, the current flowing through the closing coil 2a and the voltage across the closing coil 2a are the inductance L of the closing coil, the resistance R of the closing coil, and the capacitor. It is determined by four parameters: capacitance C and capacitor charging voltage V.

The charging voltage V is a value determined by the setting of the charging circuit, and can be known in advance. The inductance L varies depending on the individual difference of the electromagnetic operation device, and the capacitance value of the capacitor capacitance C is not determined in advance because the capacitance fluctuates due to temperature and aging deterioration.
In the temperature correction device of the state grasping device according to the first embodiment, the time series data Vk of the voltage across the coil and the time series data Ik of the coil current are acquired, and the current is supplied from the capacitor to the coil for opening (or opening). Data is analyzed from immediately after energization (k = 0) to immediately before the mover starts moving (k = N), and the coil temperature and capacitor capacitance are estimated. Since the induced voltage due to the movement of the mover does not occur immediately after the closing coil is energized until immediately before the mover starts moving, the voltage across the closing coil is the inductance of the closing coil. It is equal to the sum of the self-dielectric electromotive force LdI / dt generated at L and the potential difference RI generated at the resistance value R of the closing coil. When the primary differential data Dk of the current value is created from the current time series data Ik of the closing coil,
Vk-L / Dk-R / Ik = 0 (k = 0,..., N)
Holds. In particular, when k = 0, Ik = 0, so Vo-L · Dk = 0
It is. The temperature compensator of the state grasping device determines the coil resistance value R by optimizing L and R so that the relational expression holds for the N equations, and the state grasping device determines this coil resistance value. Used to correct the state quantity of the switchgear.

  The voltage across the coil is substantially equal to the capacitor voltage V. Capacitor voltage drop and energization current for data from immediately after energizing the coil (for opening or closing) to the closing coil (k = 0) until immediately before energization from the capacitor (k = M) Since the integrals of are equal,

It is. Here, Rc represents the internal resistance value of the capacitor. Here, the capacitance C and the internal resistance value Rc of the capacitor can be known by optimizing Rc and C so that the above equation is satisfied from k = 0 to M. The capacitor capacitance and capacitor internal resistance value measured here include fluctuations due to capacitor temperature and fluctuations due to aging. In the state grasping device, the state quantity of the switchgear is corrected using the capacitance C of the capacitor and the internal resistance value Rc. The state quantity is, specifically, the operating speed of the switchgear, the amount of contact wear, the amount of decrease in the capacitor capacity, and the like, and is information obtained from the current waveform.
As described above, in the first embodiment, the temperature measurement is performed, and the temperature correction such as the coil resistance value is not performed based on the temperature measurement value, but the electromagnetic coil resistance value, the capacitor capacitance, Since the internal resistance value of the capacitor is calculated, there is no temperature measurement error or error due to the use of an approximate conversion formula for temperature correction, and the state quantity estimation of the electromagnetic operating device or switchgear can be accurately corrected. it can.

  In the above, with respect to the closing coil 2a when the vacuum circuit breaker is moved from the opened state to the closed state, the time change of the current value flowing through the closing coil 2a and the both ends of the closing coil 2a The time variation of the voltage and the displacement of the mover in the electromagnetic operating device has been described. The opening coil 2b when the vacuum circuit breaker is moved from the closed state to the opened state. The time change of the current value flowing through the coil, the voltage across the opening coil 2b, and the time change of the displacement of the mover in the electromagnetic operating device can be explained in the same manner.

1 Electromagnetic operating device 2a Closing coil (electromagnetic coil)
2b Opening coil (electromagnetic coil) 3 Mover (movable iron core)
4 Yoke (Fixed Iron Core) 5 Permanent Magnet 9 Connecting Rod 20 Power Supply Operation Circuit 21 Capacitor for Closing 22 Capacitor for Opening 23 Current Sensor 24 Voltage Sensor 25a Discharge Switch 25b Discharge Switch 26 Charge Switch 27 Charge Control Circuit 30 Vacuum Valve (opening / closing device) 31 Insulating member 32 Contact pressure spring 33 Fixed electrode 34 Movable electrode 40 State grasping part 41 A / D converter 42 Memory 44 Movable element operation start point search means 45 Movable element operation completion point search means

Claims (4)

A fixed iron core, a movable iron core configured to be movable with respect to the fixed iron core, and an electromagnetic coil that opens and closes an opening / closing device coupled to the movable iron core by moving the movable iron core by being excited by a driving power source. Provided in an electromagnetic operating device,
A current sensor for measuring a current flowing through the electromagnetic coil, a first A / D converter for A / D converting the current measured by the current sensor at regular time intervals, and
A memory for storing current value data A / D converted by the first A / D converter as current time-series data;
A voltage sensor for measuring a voltage generated in the electromagnetic coil; a second A / D converter for A / D converting the voltage measured by the voltage sensor at a constant time interval;
A memory for storing voltage value data A / D converted by the second A / D converter as voltage time-series data;
Searching means for analyzing current time series data stored in the memory and obtaining change information of the time series data, and
A state grasping device that estimates a state quantity of the switchgear or electromagnetic operating device based on change information from the search means,
A state grasping device that determines a resistance value of the electromagnetic coil from the current time series data and the voltage time series data and corrects a state quantity of the switchgear or the electromagnetic operating device.   The current time series data and the voltage time series data from immediately after the current is supplied to the electrode coil to immediately before the movable iron core starts to move are analyzed, and the inductance L of the electromagnetic coil and the resistance of the electromagnetic coil are analyzed. 2. The state grasping device according to claim 1, wherein a value R is determined, and a state quantity of the switchgear or electromagnetic operating device is corrected using the determined resistance value R of the electromagnetic coil. A fixed iron core, a movable iron core configured to be movable with respect to the fixed iron core, and an electromagnetic coil that opens and closes an opening / closing device coupled to the movable iron core by moving the movable iron core when excited by a charging voltage of a capacitor. Provided in an electromagnetic operating device comprising:
A current sensor for measuring a current flowing through the electromagnetic coil, a first A / D converter for A / D converting the current measured by the current sensor at regular time intervals, and
A memory for storing current value data A / D converted by the first A / D converter as current time-series data;
A voltage sensor for measuring a voltage generated in the electromagnetic coil; a second A / D converter for A / D converting the voltage measured by the voltage sensor at a constant time interval;
A memory for storing voltage value data A / D converted by the second A / D converter as voltage time-series data;
A search means for analyzing the current time series data and the voltage time series data stored in the memory and obtaining change information of the time series data;
A state grasping device that estimates the state of the switchgear or electromagnetic operating device based on the change information from the search means,
The capacitance C and the internal resistance value Rc of the capacitor are determined from the current time series data, the voltage time series data, and the charging voltage of the capacitor, and the determined capacitance C and internal resistance value Rc of the capacitor are used. A state grasping device that corrects a state quantity of the opening / closing device or the electromagnetic operating device.   Analyzing the current time-series data, the voltage time-series data and the charging voltage of the capacitor immediately after energizing the electromagnetic coil from the capacitor to immediately before ending energization from the capacitor, 4. The capacitance C and the internal resistance value Rc are determined, and the state quantity of the switchgear or electromagnetic operating device is corrected using the determined capacitance C and internal resistance value Rc of the capacitor. Status tracking device.