JP2016072064A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switchgear which maintains the breaking speed of a circuit breaker, even when the drive power supply voltage of an electric motor drops, without increasing the size, and the like, of the circuit breaker.SOLUTION: A switchgear includes an interruption unit consisting of a fixed electrode and a movable electrode coming into contact therewith or separating therefrom, and an operation unit for driving the movable electrode, and is constituted so that the movable electrode comes into contact with the fixed electrode, with a predetermined contact distance. The operation unit is constituted of an electric motor, and contact distance control means controls the contact distance, on the basis of a power supply voltage for driving the electric motor.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a switchgear, and in particular, a switchgear suitable for a switchgear that operates to open and close a breaker such as a gas circuit breaker is electrically operated and uses a linear motor for the electric operation. About.

  A gas circuit breaker, which is a type of switchgear, has the role of preventing the spread of accidents in the power system by quickly interrupting the accident current, and therefore, development of a more reliable device is required.

  As an operating device for operating the gas circuit breaker, a spring operating device that obtains the operating force by releasing the spring force fed to the operating spring, and an air pressure that obtains the operating force using air pressure or hydraulic pressure An operating device and a hydraulic operating device are conventionally known.

  The characteristics of each of these actuators are that the spring actuator is excellent in low operating force, maintainability, and economy, the pneumatic actuator is easy to handle and obtains high operating force, and the hydraulic actuator is High operating force can be obtained with low noise.

  However, in the operation by the operation spring of the spring operation device, the elastic force of the operation spring is not always constant, the positioning accuracy of the operation spring is low, and the structure is complicated and consists of many parts. There is room for improvement. In addition, in hydraulic actuators and pneumatic actuators that use hydraulic pressure or pneumatic pressure, the operating characteristics of the working fluid (oil or air) may fluctuate due to changes in ambient temperature, and piping leakage of the working fluid may occur. There are aspects that are difficult to handle.

  For this reason, as a method for improving the above-described points, it has been proposed to use an electric force as an operation force for opening and closing the blocking portion. An example of this is described in Patent Document 1.

  Patent Document 1 describes an electric operating device that uses a linear motor as an operating force for opening and closing a blocking portion and uses the linear motor as an operating force. It can be said that the use of the linear motor as the operating force for opening / closing the breaking unit as in Patent Document 1 is a configuration intended to operate the gas circuit breaker in a predetermined drive pattern.

JP-A-5-89755

  When the driving force of the linear motor as shown in Patent Document 1 described above is used as the operating force for opening and closing the blocking portion, the operating device requires a driving power source for driving the motor. In particular, switchgears such as gas circuit breakers are required to be shut down even during a power outage without a power source for the substation where the device is installed. There is a need.

  As an example of this power storage device, there is a battery such as an electrolytic capacitor whose output voltage varies greatly according to the amount of power storage, while there is a battery whose output voltage varies little according to the amount of power storage, such as a Pb battery. . Capacitor power supplies such as electrolytic capacitors have advantages in that the amount of electricity stored per unit volume is inferior to that of Pb batteries, but the allowable current is larger than that of Pb batteries, and that it is easy to handle as a power supply of several hundred volts. .

  However, when driving an electric motor such as a linear motor with a drive device that is a voltage-type inverter circuit, the voltage of the capacitor power supply decreases after a power failure at a substation, etc. There is a problem that it is difficult to supply the linear motor, and there is a high possibility that the breaking speed necessary for the breaker cannot be maintained. Conversely, if the capacitor capacity is increased so that the voltage does not drop significantly even if the amount of stored electricity is consumed, there is a concern that the capacitor size increases and the size and cost of the circuit breaker increase.

  The present invention has been made in view of the above points, and the object of the present invention is to break the circuit breaker without increasing the size of the circuit breaker even when the drive power supply voltage of the electric motor is lowered. An object of the present invention is to provide a switchgear capable of maintaining speed.

  In order to achieve the above object, the switchgear according to the present invention includes a fixed electrode and a blocking portion including a movable electrode that contacts or separates from the fixed electrode, and an operating device that drives the movable electrode, The movable electrode is in contact with the fixed electrode with a predetermined contact distance, and the operating device is constituted by an electric motor, and the contact distance is controlled based on a power supply voltage for driving the electric motor. The contact distance control means is provided.

  According to the present invention, the breaking speed of the circuit breaker can be maintained without increasing the size or the like of the circuit breaker even when the drive power supply voltage of the electric motor is lowered.

It is Example 1 of the switchgear of this invention, and is sectional drawing which shows the closing state of a gas circuit breaker. It is Example 1 of the switchgear of this invention, and is sectional drawing which shows the opening state of a gas circuit breaker. It is sectional drawing for demonstrating operation | movement of the fixed electrode and movable electrode of a gas circuit breaker in Example 1 of the switchgear of this invention. It is a figure which shows the detailed structure of the control part employ | adopted as the gas circuit breaker in Example 1 of the switchgear of this invention. It is a map figure for demonstrating the wipe length calculating part in Example 1 of the switchgear of this invention. It is a figure for demonstrating the interruption | blocking operation | movement in the state whose power supply voltage of the gas circuit breaker in Example 1 of the switchgear of this invention is an initial voltage. It is a figure for demonstrating the interruption | blocking operation | movement in the state in which the power supply voltage of the gas circuit breaker in Example 1 of the switchgear of this invention is located below a threshold value. It is a figure which shows the detailed structure of the motor control part employ | adopted as the gas circuit breaker in Example 2 of the switchgear of this invention. It is a figure for demonstrating the interruption | blocking operation | movement of the gas circuit breaker in Example 2 of the switchgear of this invention.

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

  1 and 2 show a gas circuit breaker which is Embodiment 1 of the present invention, FIG. 1 shows a closed (turned on) state of the gas circuit breaker, and FIG. 2 shows an opened (cut off) state of the gas circuit breaker. .

  As shown in the figure, the gas circuit breaker according to the present embodiment is broadly divided into a breaker 30 for breaking the accident current and an operation part 31 for operating the breaker 30.

The shut-off unit 30 is opposed to the fixed electrode 3 fixed to the insulating support spacer 2 provided at the end of the sealed metal container 1 in the sealed metal container 1 filled with SF ₆ gas. The movable electrode 4 disposed and closed or opened with respect to the fixed electrode 3 and provided at the tip of the movable electrode 4 and extinguishing the arc generated between the fixed electrode 3 and the movable electrode 4 at the time of opening. Nozzle 5 that blows off the gas and extinguishes the gas, one side is connected to the operating portion 31 side, the other side is connected to the movable electrode 4, the insulating support cylinder 7 that supports the movable electrode 4, and the movable A high-voltage conductor 8 that is connected to the electrode 4 and serves as a main circuit conductor constituting a part of the power system main circuit.

  And the interruption | blocking part 30 moves the movable electrode 4 through the operation force from the operation part 31, and electrically opens and closes with respect to the fixed electrode 3, thereby supplying current (closing) and blocking (opening). Is done.

  On the other hand, the operation unit 31 includes an operation device case 13 provided adjacent to the sealed metal container 1, a linear motor (operation device) 10 installed in the operation device case 13, and an interior of the linear motor 10. A mover 11 that is arranged and linearly driven in the axial direction is arranged.

  The linear motor 10 in this embodiment is a permanent magnet type linear motor composed of a magnet array in which magnets are arranged at equal intervals, and the mover 11 can be driven while keeping the hermetic metal container 1 airtight. It is connected to the insulating rod 9 through a straight seal portion (not shown) provided on the inner surface. The insulating rod 9 is connected to the movable electrode 4, and the movable electrode 4 in the blocking unit 30 can be operated through the operation of the movable element 11.

  Further, the linear motor 10 is electrically connected to the drive circuit unit 14 through a sealing terminal 12 provided on the surface of the operation device case 13. As a power source for the drive circuit unit 14, a power source unit 16 is electrically connected to the drive circuit unit 14. The power supply unit 16 is configured by a DC voltage source, for example, a capacitor power supply such as an electrolytic capacitor or a film capacitor whose voltage varies according to the amount of stored electricity, upon receiving an external power supply (not shown).

  Further, a control unit 15 is connected to the drive circuit 14, and based on a command from the control unit 15, a switch element constituting the drive circuit 14 is driven and an arbitrary current is supplied to the linear motor 10 to be movable. The child 11 is driven. A signal from a linear encoder 18 provided in the linear motor 10 is input to the control unit 15, and the linear encoder 18 receives a position signal of the movable electrode 4 from a linear scale (not shown) attached to the movable element 11. The position signal is read and transmitted to the control unit 15. The control unit 15 calculates the position and phase of the movable element 11 based on the position signal of the movable electrode 4 from the linear encoder 18, and uses the result for controlling the linear motor 10.

  Further, the power supply unit 16 is provided with a power supply voltage detection circuit 17 which is a power supply voltage detection means for detecting the voltage of the capacitor power supply provided in the power supply unit 16, and the output of the power supply voltage detection circuit 17 is input to the control unit 15. And used for motor control.

  That is, in this embodiment, the control unit 15 that controls the voltage, current, and / or phase supplied to the linear motor 10 and the drive signal from the control unit 15 receive the current according to the drive signal. 10, a drive circuit unit 14 that supplies power to the power source 10, a power source unit 16 that is a power source of the drive circuit unit 14, and a linear encoder that is attached to the linear motor 10 and transmits the position of the mover 11 of the linear motor 10 to the reading control unit 15. 18, and the power supply voltage detection circuit 17 detects the voltage of the power supply unit 16 and outputs the detected voltage of the power supply unit 16 to the control unit 15.

  In FIG. 3, operation | movement of the fixed electrode 3 and the movable electrode 4 in the gas circuit breaker of a present Example is shown. FIG. 3A shows a closing state in which the fixed electrode 3 and the movable electrode 4 connected to the movable element 11 of the linear motor 10 are in contact with each other.

  As shown in the figure, the movable electrode 4, the nozzle 5 and the cylinder 6 connected to the mover 11 of the linear motor 10 move relative to the fixed electrode 3 in the X direction in the figure. In this embodiment, the position of the movable electrode 4 in FIG. 3A is set to a value corresponding to the initial value of the power supply voltage, that is, the position zero (0), and the contact distance with the fixed electrode 3 (the distance from the position 0 to X1; That is, the wipe length W0 is the amount of movement until the fixed electrode 3 and the movable electrode 4 are separated from the input state.

  FIG. 3B shows a state where the fixed electrode 3 and the movable electrode 4 are separated from each other, that is, a cut-off state.

As shown in the figure, the movable electrode 4 moves from the position zero (0) to the position X3 by moving the mover 11 of the linear motor 10 from the position zero (0) in the X direction, and cuts off the current. become. At this time, the arc is extinguished by blowing SF ₆ gas having arc extinguishing performance to the arc generated between the fixed electrode 3 and the movable electrode 4 to cut off the current. With regard to the interruption performance, the arc extinguishing performance with SF ₆ gas is maintained by making the average speed (hereinafter referred to as the interruption speed) from the position X1 where the movable electrode 4 is separated from the fixed electrode 3 to the middle X2 constant or higher. The

  Next, the configuration of the control unit 15 which is a feature of the present embodiment will be described with reference to FIG.

  As shown in the figure, in this embodiment, a position command to the linear motor 10 is selected based on the gas circuit breaker on / off operation command to the control unit 15, and the mover 11 calculated from the signal from the linear encoder 18 is selected. In order to supply an appropriate current at the selected position to the linear motor 10 on the basis of the phase, the motor control unit 21 that outputs the drive signal of the drive circuit 14 is basically provided.

  Based on the detection value from the power supply voltage detection circuit 17, the control unit 15 determines the wipe length calculation unit 23 for obtaining a wipe length suitable for the power supply voltage, and the output value of the wipe length calculation unit 23. A closing position command calculation unit 22 for calculating the closing position of the gas circuit breaker is provided (a contact distance control means is constituted by the closing position command calculation unit 22 and the wipe length calculation unit 23). Based on this, the insertion position of the gas circuit breaker in the motor control unit 21 is set.

  That is, the control unit 15 of the present embodiment is for supplying the linear motor 10 with a current according to the drive signal from the drive circuit unit 14 based on the phase of the mover 11 of the linear motor 10 calculated from the linear encoder 18. Until the fixed electrode 3 and the movable electrode 4 suitable for the power supply voltage for driving the linear motor 10 are released from the applied state based on the detected value from the motor control unit 21 that outputs the drive signal and the power supply voltage detection circuit 17. A wipe length calculation unit 23 for obtaining a wipe length that is a movement amount of the first and second positions, and a closing position command calculating unit 22 for calculating a closing position of the blocking unit 30 based on an output value of the wipe length calculating unit 23. Based on the output value of the command calculation unit 22, the closing position of the blocking unit 30 in the motor control unit 21 is set.

  For example, as shown in FIG. 5, the wipe length calculation unit 23 sets a threshold value Vth1 of the power supply voltage value, and changes the wipe length from the initial wipe length value W0 to W1 when the power supply voltage falls below the threshold value Vth1. Operate in the form. It is desirable to provide hysteresis in the map. When the power supply voltage exceeds the threshold value Vth1, the wipe length is returned from W1 to W0 when the threshold value Vth2 greater than the threshold value Vth1 is exceeded. The threshold value Vth1 of the power supply voltage value is desirably set to a value having a margin by using an operation simulation or an actual machine test. Further, instead of providing a threshold value and setting the wipe length above and below the threshold value, a method of setting the power supply voltage and the wipe length one to one may be used.

On the other hand, for example, when the insertion position at the wipe length initial value W0 is set to zero (0) and the output of the wipe length calculation unit 23 is set to W, the insertion position command calculation unit 22 calculates the input position X _MAKE of the calculation result as Calculate as follows.

Based on the closing position X _MAKE calculated in _Equation 1, the motor control unit 21 determines the closing position of the gas circuit breaker, and replaces the initial position in the interruption operation and the final target position in the closing operation with the calculation result in Equation 1. The motor can be driven to the power supply voltage.

  The effect of the configuration of the above-described embodiment will be described with reference to FIGS.

  FIG. 6 shows an example of the shut-off operation when the power supply voltage Vdc is at the initial voltage Vst.

  In this figure, before the interruption command to the gas circuit breaker enters time t0, the position of the movable electrode 4 is at a position zero corresponding to the wipe length W0 (see FIG. 3). A shut-off command is input to the gas circuit breaker, and the position of the movable electrode 4 connected to the mover 11 reaches the position X1 that passes through the wipe length at time t1 and reaches the speed V1. Further acceleration occurs after time t1, and at time t2, speed V2 and position X2 are reached. The shutoff speed is defined as an average speed between the positions X1 and X2, and when roughly calculated, the shutoff speed can be calculated as (V1 + V2) / 2.

  FIG. 7 shows an example of a cutoff operation when the power supply voltage Vdc is below the threshold value Vth1.

  In this figure, before the interruption command to the gas circuit breaker enters time t0, the position of the movable electrode 4 is located at the position X4 corresponding to the wipe length W1 (see FIG. 3). Although acceleration is performed after a shut-off command is input at time t0, when the same thrust as in FIG. 6 is used, the time to reach the position X1 that passes through the wipe length takes t1 ′ longer than t1. However, the speed V1 ′ at time t1 ′ is faster than the speed V1 because the acceleration distance is long, that is, the acceleration time is long. After the time t1 ′, the thrust is reduced due to insufficient power supply voltage, so the speed V2 ′ at the time t2 ′ reaching the position X2 is lower than the speed V2. Even when the speed V2 ′ is lower than the speed V2, the speed V1 ′ at the position X1 is higher than the speed V1, so that the average speed between the positions X1 and X2 is maintained equal to that in FIG.

  In this way, by using the configuration of the present embodiment, even when the linear motor is used for the operation device of the gas circuit breaker, even when the power supply voltage is lowered, the interruption speed can be maintained, so that, for example, In a substation or the like where a circuit breaker is installed, it is possible to perform a circuit breaking operation a plurality of times even in a power failure state in which charging to the motor drive power supply is cut off.

  Furthermore, since the shutoff speed can be maintained even when the power supply voltage is lowered, when capacitors are used as the electric motor drive source, the capacitor capacity can be reduced and the cost can be reduced. When a battery is used as a drive source for an electric motor such as a linear motor, the breaking performance can be maintained even when the power supply voltage is lower than expected. Therefore, it is effective as a circuit breaker function protection function when the battery voltage is abnormally lowered.

  According to the present embodiment, the contact distance between the fixed electrode and the movable electrode is obtained based on the power supply voltage, that is, when the power supply voltage is lowered, the contact distance between the fixed electrode and the movable electrode is extended. Thus, the average speed of the section can be maintained even if the approaching distance during the blocking operation is increased, the initial speed of the section requiring the blocking speed is increased, and the final speed of the section is decreased.

  Therefore, it becomes possible to maintain the shut-off performance when the power supply voltage is lowered, and reduce the capacitor capacity when the capacitor power source is applied to the power source, that is, without increasing the size or the like of the gas circuit breaker. It is possible to maintain the shut-off speed.

  Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 8 shows an internal configuration example of the present embodiment with respect to the motor control unit 21 in FIG.

  As shown in FIG. 8, the motor control unit 21 includes a position command calculating unit 21a, a position control calculating unit 21b, a speed command limiting unit 21c, a speed control calculating unit 21d, and a speed upper limit calculating unit 21e which is a feature of this embodiment. Has been.

The position command calculation unit 21a has a function of calculating the closing position of the gas circuit breaker based on the closing position command and outputting a position command X ^* based on the closing or blocking command in the operation command. Further, the position control calculation unit 21b uses the first speed command V ^* based on the position command X ^* and the position feedback value X ^ calculated based on the signal from the linear encoder 18 (see FIGS. 1 and 2). Calculate and output ^** . The specific configuration of the position control calculation unit 21b is that the first speed command V ^** is calculated from the feedback control or position command X ^* that calculates the speed command based on the deviation between the position command X ^* and the position feedback value X ^. You may comprise by the feedforward control to calculate. Further, a control configuration combining feedforward control and feedback control may be used.

Speed command limiting section 21c is a limit calculating portion to the upper limit speed limit V _max output by the speed upper computing unit 21e. When the first speed command V ^** exceeds the velocity limit _{V max,} and outputs the second speed command V ^* as the speed limit _{V max,} the first speed command V ^** speed limit _{V max} Is less than the first speed command V ^** is output as the second speed command V ^* .

The speed control calculation unit 21d outputs a motor drive command that is a drive signal of the drive circuit 14 based on the speed feedback value V ^ calculated based on the second speed command V ^* and the signal from the linear encoder 18. It has a configuration. The configuration in the speed control calculation unit 21d is a known control configuration, and detailed description thereof in this embodiment is omitted.

  A calculation method in the speed upper limit calculation unit 21e, which is a feature of the present embodiment, will be described with reference to FIG. 9 which is an example of operation waveforms in the present embodiment.

FIG. 9 is based on the assumption that the power supply voltage Vdc is lower than the threshold value Vth1, the wipe length is changed from W0 to W1, and the gas circuit breaker is located at the position X4 as the closing position X _MAKE, as in the first embodiment. .

According cutoff command to the gas circuit breaker, the linear motor 10 at the time of t0 to start driving, and outputs a speed V2 which is the initial value as the speed upper limit V _max. The speed V2 is a numerical value when the input position is set to the position 0. When the linear motor 10 reaches the position X1 at time t11 ′ and the motor speed V11 ′ at this time is obtained, the speed upper limit calculation unit 21e sets the target cutoff speed V _ave between the preset positions X1 and X2. ^* value based on, it calculates the speed target value V12' at position X2, and calculates the output as a speed upper limit _{V max.} For example, Formula 2 is used as an arithmetic expression for the speed target value V12 ′.

As described above, as the speed upper limit V _max, the speed target value V12' at position X2 has the output from the speed limit computing unit 21e, the second is the output value of the speed command calculating unit 21c of the speed command V ^* of Since this is the upper limit value, even if the first speed command V ^** is greater than the speed target value V12 ′, the second speed command V ^* is equal to the speed target value V12 ′. As a result, the speed control calculation unit 21d controls the linear motor 10 so that the motor speed does not exceed V12 ′.

When the output of the speed upper limit calculation unit 21e is changed from the speed V2 to the speed target value V12 ′ at the position X2, and the speed target value V12 ′ value at the position X2 is smaller than the speed V2 as shown in FIG. 9, the motor at the position X1 Since the speed V11 ′ is faster than expected, the target average speed V _ave ^* can be realized by accelerating the speed at the position X2 to the speed target value V12 ′ at the position X2 lower than V2.

  Therefore, as compared with the case where the speed of the position X2 is accelerated to V2, the thrust and energy consumption required for motor acceleration can be reduced, and the power supply voltage drop can be minimized.

FIG. 9 shows an example in which the closing position X _MAKE is at the position X4. However, when the blocking operation is started from the position 0 and the position X1 is reached, the speed target value at the position X2 is sequentially calculated to obtain the motor speed upper limit value. By changing V _max , it becomes possible to input an appropriate speed command value for realizing the target cutoff speed V _ave ^* to the speed control unit, so that the power supply voltage and the motor current are stable as long as there is a margin. Cut-off speed can be realized.

  Even with this configuration of the present embodiment, the same effects as those of the first embodiment can be obtained.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. It is possible to add, delete, and replace the configuration of a part of the configuration of the embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Sealed metal container, 2 ... Insulation support spacer, 3 ... Fixed electrode, 4 ... Movable electrode, 5 ... Nozzle, 6 ... Cylinder, 7 ... Insulation support cylinder, 8 ... High voltage conductor, 9 ... Insulation rod, 10 ... Linear Motor 11, movable element 12, sealing terminal 13, operating case 14, drive circuit 15, control unit 16, power supply unit 17, power supply voltage detection circuit 18, linear encoder 21, motor control unit 21a ... Position command calculating unit, 21b ... Position control calculating unit, 21c ... Speed command limiting unit, 21d ... Speed control calculating unit, 21e ... Speed upper limit calculating unit, 22 ... Feeding position command calculating unit, 23 ... Wipe length calculating unit , 30: blocking unit, 31: operation unit

Claims (11)

A blocking portion including a fixed electrode and a movable electrode that contacts or separates from the fixed electrode, and an operating device that drives the movable electrode, and the movable electrode contacts the fixed electrode at a predetermined contact distance. A structure to
An opening / closing apparatus comprising: a contact distance control means for controlling the contact distance based on a power supply voltage for driving the electric motor, wherein the operating device is constituted by an electric motor. The switchgear according to claim 1,
Power supply voltage detection means for detecting a power supply voltage for driving the electric motor, and when the detected value of the power supply voltage for driving the electric motor detected by the power supply voltage detection means falls below a preset threshold, An opening / closing device characterized in that control for extending the contact distance is performed by the contact distance control means. The switchgear according to claim 2, wherein
The electric motor is composed of a linear motor, receives a drive signal from the control unit that controls the voltage, current, and / or phase supplied to the linear motor, and converts the current according to the drive signal to the current. A drive circuit unit that supplies the linear motor; a power source unit that is a power source of the drive circuit unit; and a linear encoder that is attached to the linear motor and reads the position of the mover of the linear motor and transmits the position to the control unit. The power supply voltage detecting means detects the voltage of the power supply unit, and outputs the detected voltage of the power supply unit to the control unit. The switchgear according to claim 3, wherein
The control unit outputs a drive signal for supplying a current according to the drive signal from the drive circuit unit to the linear motor based on the phase of the mover of the linear motor calculated from the linear encoder. And a wipe length that is a movement amount until the fixed electrode and the movable electrode that are suitable for the power supply voltage for driving the linear motor are released from the applied state based on the detected value from the power supply voltage detecting means The wipe length calculation unit comprises a wipe position calculation unit that calculates an input position of the blocking unit based on an output value of the wipe length calculation unit, and based on an output value of the input position command calculation unit, An opening / closing device that sets a closing position of the blocking unit in a motor control unit. The switchgear according to claim 4, wherein
The wipe length calculator sets a power supply voltage threshold (Vth1) for driving the linear motor in advance, and if the power supply voltage falls below a preset threshold (Vth1), the wipe length is set to the wipe length. When the power supply voltage is changed from the initial value (W0) to a larger wipe length (W1) and the power supply voltage becomes larger than the preset threshold value (Vth1), the threshold value (Vth2) larger than the preset threshold value (Vth1). An opening / closing device that returns the wipe length from W1 to W0 when the value exceeds W. The switchgear according to claim 4, wherein
The closing position command computing section the on position in the wipe length initial value (W0) to zero (0), when the output wipe length of the wipe length calculator and (W), the following the loading position X _MAKE calculation result The motor control unit determines the closing position of the shut-off portion based on the closing position X _MAKE calculated by the formula 1, and calculates the initial position in the closing operation and the final target position in the closing operation. An opening / closing device, wherein the linear motor is driven by substituting the calculation result of Equation (1).

The switchgear according to claim 4, wherein
The motor control unit performs a position calculation of the closing position of the blocking unit based on a closing position command from the closing position command calculating unit, and outputs a position command (X ^* ) based on the closing or blocking command in the operation command. Based on the position command calculation unit to be output, the position command (X ^* ) output from the position command calculation unit, and the position feedback value (X ^) calculated based on the signal from the linear encoder, When the position control calculation unit that calculates and outputs the speed command (V ^** ) and the first speed command (V ^** ) of the position control calculation unit exceeds the speed upper limit (V _max ), the second The speed command (V ^* ) is output as a speed upper limit (V _max ), and when the first speed command (V ^** ) is lower than the speed upper limit (V _max ), the first speed command ( V ^** ) as the second speed command (V ^* ) A drive signal for the drive circuit based on a speed feedback limit (V ^) calculated on the basis of a speed command limiter to be applied, a second speed command (V ^* ) and a signal from the linear encoder When the linear motor reaches the position (X1) and the speed (V11 ′) of the linear motor at this time is obtained, the speed control calculation unit that outputs a motor drive command and the previously set movable electrode Based on the target breaking speed (V _ave ^* ) value between the two positions (X1 and X2), the speed target value (V12 ′) at the position (X2) of the movable electrode is calculated, and the speed upper limit value (V _max ) And a speed upper limit calculation unit for calculating and outputting as a switching device. The switchgear according to claim 7,
The position control calculation unit is a feedback control that calculates a speed command based on a deviation between the position command (X ^* ) and the position feedback value (X ^), or the first speed from the position command (X ^* ). An opening / closing device comprising feedforward control for calculating a command (V ^** ). The switchgear according to any one of claims 3 to 8,
The linear encoder reads a position signal from a linear scale attached to a mover of the linear motor, and transmits the position signal to the control unit. The switchgear according to any one of claims 3 to 9,
The power supply unit is configured by a capacitor power supply. The switchgear according to claim 10,
The switch power supply is characterized in that the capacitor power source comprises an electric field capacitor or a film capacitor.

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