CN112136195A - Electric operating device for tap changer and tap switching method - Google Patents

Abstract

The electric operating device for a tap changer according to the embodiment includes a driving unit, a multi-turn rotary encoder, a monitoring unit, and a control unit. The drive unit switches the taps of the tap changer by driving the drive shaft with the motor. The multi-turn rotary encoder has a member that rotates n times with respect to the driving shaft, and detects the rotational position of the driving shaft by detecting the rotational position of the member. The monitoring unit monitors the state of the tap changer based on the rotational position detected by the multi-turn rotary encoder. The control unit controls the drive unit based on the monitoring result of the monitoring unit.

Description

Electric operating device for tap changer and tap switching method

technical field

Embodiments of the present invention relate to an electric operating device for a tap changer and a tap switching method.

Background technique

Conventionally, there is known an electric operation device that switches the position of the tap of the tap changer when the load is installed on the transformer. The electric operation device switches the position of the tap by rotating the drive shaft connected to the gear by the motor drive unit that becomes the power. The operation control of the motor drive unit is performed by the step control mechanism by the ON/OFF signal of the cam switch connected to the drive shaft by the gear, and the step control mechanism is opened and closed for the motor by the opening and closing operation of the circuit. The relay sequence circuit of the device is composed. In addition, the electric operation device includes a dial switch connected to the drive shaft by a gear. The dial switch outputs a tap position signal based on the rotational position of the drive shaft.

However, since the conventional electric operation device is provided with a mechanical structure in structure such as a stepping control mechanism and a dial switch as described above, the number of parts may be large, and assembly and maintenance may take time. In addition, at the time of assembly or maintenance, a person who is familiar with the mechanism structure is required to perform work, and repair and maintenance may not be easily performed due to lack of workability at the time of maintenance. In addition, conventionally, the position information of the tap can be acquired by a dial switch, but this signal is used to grasp the limit (limit value) of the tap, and is not effectively used for operation control of the electric operation device.

Prior art literature:

Patent Literature:

Patent Document 1: Japanese Patent Laid-Open No. 54-129367

Patent Document 2: Japanese Patent Publication No. 2010-502170

SUMMARY OF THE INVENTION

The problem to be solved by the invention

The problem to be solved by the present invention is to provide an electric operating device for a tap changer and a tap switching method which can simplify the adjustment at the time of assembling the electric operating device and realize easy maintenance.

Means for solving problems

The electric operating device for a tap changer according to the embodiment includes a driving unit, a multi-turn rotary encoder, a monitoring unit, and a control unit. The drive unit drives the drive shaft with the motor to switch the taps of the tap changer. The multi-turn rotary encoder has a member that rotates n times with respect to the driving shaft, and detects the rotational position of the driving shaft by detecting the rotational position of the member. The monitoring unit monitors the state of the tap changer based on the rotational position detected by the multi-turn rotary encoder. The control unit controls the drive unit based on the monitoring result of the monitoring unit.

Description of drawings

FIG. 1 is a diagram showing a configuration example of an electric operating device for a tap changer according to an embodiment.

FIG. 2 is a diagram showing a component configuration example of the motor 20 according to the embodiment.

FIG. 3 is a diagram showing the configuration of the electric operating device for the tap changer shown in FIG. 1 from the viewpoint of hardware.

FIG. 4 is a diagram for explaining tap switching control at the time of boosting.

FIG. 5 is a diagram for explaining the tap switching control in the case where the boosting control is further performed after the boosting control.

FIG. 6 is a diagram for explaining tap switching control in the case where step-down control is performed after step-up control.

FIG. 7 is a diagram for explaining the tap switching control in the case where the step-down control is further performed after the step-down control.

FIG. 8 is a diagram for explaining the state of the tap switching control at the time of step-up and the time of step-down using the tap change control table.

9 is a flowchart showing an example of processing performed by the electric operating device for a tap changer according to the embodiment.

FIG. 10 is a flowchart showing an example of a stop control process according to the embodiment.

FIG. 11 is a flowchart showing an example of exception processing at the time of blocking according to the embodiment.

FIG. 12 is a flowchart showing an example of abnormal processing at the time of runaway according to the embodiment.

Detailed ways

Hereinafter, the electric operating device for a tap changer and the tap switching method of the embodiment will be described with reference to the drawings. In addition, in the following embodiment, a load-time tap changer is used as an example of a tap changer.

FIG. 1 is a diagram showing a configuration example of an electric operating device for a tap changer according to an embodiment. The electric operation device 1 for a tap changer includes, for example, a host disk operation unit 10 , a motor 20 , a multi-turn rotary encoder 30 , and an operation control unit 100 . The combination of the motor 20 and the motor drive control unit 130 is an example of a "drive unit".

The upper disk operation unit 10 outputs, to the operation control unit 100 , a control signal caused by an operation performed by an administrator or the like on the operation unit provided in the upper device. The control signal related to the upper disk operation unit 10 includes, for example, a signal for upper control. The upper control refers to, for example, tap switching control accompanied by step-up control and step-down control of the tap changer LTC under load.

The motor 20 switches the position of the tap of the tap changer LTC (connection point along the winding which can select a certain number of rotations) under load by rotating a rotatable shaft portion (for example, a driving shaft 21 to be described later) in a predetermined direction. . The motor 20 rotates the driving shaft in the opposite direction by, for example, step-up control and step-down control. The electric operating device 1 for a tap changer changes the winding ratio of the transformer provided with the load time tap changer LTC by switching the position of the tap of the load time tap changer LTC by the motor 20, and adjusts the voltage of the transformer. The component configuration of the motor 20 according to the embodiment will be described in detail later.

The multi-turn rotary encoder 30 is attached, for example, directly below the drive shaft that is rotated by the drive of the motor 20 . The multi-turn rotary encoder 30 has a member that rotates n (n>0) times with respect to the driving shaft, and detects the rotational position of the driving shaft by detecting the rotational position of the member. In addition, the multi-turn rotary encoder 30 outputs the detected rotational position information to the operation control unit 100 . The rotation position information refers to, for example, absolute position information (absolute value) including the rotation angle and the number of rotations in the multi-turn rotation of the main shaft. The multi-turn rotary encoder 30 outputs rotational position information when the rotational position of the main shaft changes (when the rotational angle deviates by several [degrees]).

The operation control unit 100 includes, for example, an operation unit 110 , a switching control unit 120 , and a motor drive control unit 130 . The switching control unit 120 and the motor drive control unit 130 are each realized by executing a program (software) by a hardware processor such as a CPU (Central Processing Unit). In addition, some or all of these components may be composed of LSI (Large Scale Integration: Large Scale Integration), ASIC (Application Specific Integrated Circuit: Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array: Field Programmable Gate Array) , GPU (Graphics Processing Unit: Graphics Processing Unit) and other hardware (circuit part; including circuitry) implementation, and can also be implemented through the cooperation of software and hardware. The program may be stored in advance in a storage unit (not shown) of the operation control unit 100, or may be stored in a removable storage medium such as a DVD or a CD-ROM, and the storage medium may be installed in the operation control by mounting the storage medium in the drive device. in the HDD (Hard Disk Drive) and flash memory of the unit 100 .

The operation unit 110 outputs the operation content of the user's manual operation to the switching control unit 120 . The operation content of the manual operation is, for example, a signal for controlling the step-up operation and the step-down operation obtained by the user manually operating an operation button that instructs step-up or step-down of the voltage of the transformer installed in advance as the operation unit 110 .

The switching control unit 120 includes, for example, an operation accepting unit 122 , a monitoring unit 124 , a command control unit 126 , and an output unit 128 . The command control unit is an example of a "control unit". The operation accepting unit 122 accepts, from the operation unit 110 or the upper disk operation unit 10 , a control signal instructing tap switching by step-up or step-down of the tap changer LTC under load.

The monitoring unit 124 monitors the state of the tap changer LTC under load based on the rotational position information detected by the multi-turn rotary encoder 30 . Specifically, the monitoring unit 124 monitors the state of the tap changer LTC under load based on the position and state of the motor 20 acquired based on the rotational position information. The position of the motor 20 includes, for example, the rotation angle and the number of rotations of the driving shaft rotated by the motor 20 . In addition, the monitoring unit 124 derives the position of the tap of the tap changer LTC under load based on the rotation angle and the number of rotations. In addition, the monitoring unit 124 monitors the state (normal state or abnormal state) of the tap changer LTC under load based on the state of the motor 20 itself (for example, whether the motor 20 is being driven in accordance with a command from the command control unit 126). Here, the abnormal state of the tap changer LTC under load refers to, for example, a blocked state or a runaway state. The blocked state refers to, for example, a state in which the motor 20 does not rotate for a predetermined time after the rotation control command is output, or a state in which the time from the start of the motor 20 operation to the tap switching exceeds a predetermined time. The runaway state refers to, for example, a state in which the driving of the motor 20 is continued despite the completion of the switching of the taps of the tap changer LTC under load and the output of a stop control command to the motor 20 . The monitoring unit 124 stores and manages the rotational position information obtained from the multi-turn rotary encoder 30 by a counter value such as a binary counter in a predetermined register.

The command control unit 126 outputs a command signal for rotation control or stop control of the motor 20 to the motor drive control unit 130 based on the control information received by the operation reception unit 122 .

The output unit 128 outputs the state of the control by the operation control unit 100 (for example, the monitoring result of the monitoring unit 124 ) and the like. For example, the output unit 128 outputs a control signal such as an operating signal to the upper dial operation unit 10 at a predetermined timing as a signal notified by the upper unit. The operating signal is, for example, a signal that is represented by 1 when the motor 20 is operating, and represented by 0 when the motor 20 is stopped. In addition, the output unit 128 includes, for example, a light emitting unit (eg, LED (Light Emitting Diode)) for notifying the processing state, and a display device for displaying an image. For example, when an error or abnormality occurs in the tap switching control, the output unit 128 turns on the LED for abnormality detection, or causes the display device to display that the abnormality has occurred.

When the motor drive control unit 130 receives a rotation control signal from the switching control unit 120 , it rotates the motor 20 in a predetermined direction, and performs tap switching by step control. In addition, the motor drive control unit 130 executes drive control for stopping the rotation of the motor 20 upon receiving a signal to stop the control from the switching control unit 120 .

Next, the component configuration of the motor 20 in the embodiment will be described. FIG. 2 is a diagram showing a component configuration example of the motor 20 according to the embodiment. The motor 20 shown in FIG. 2 includes, for example, a drive shaft 21 , a motor side pulley 22 , a drive shaft side pulley 23 , a tensioner 24 , a timing belt 25 , a bevel gear 26 , a handle shaft 27 , and a handle coupling Lock 28. In addition, in the example of FIG. 2, the multi-turn rotary encoder 30 is also shown.

In the motor 20 , a motor-side pulley 22 is attached to the rotating shaft, and is coupled to the drive shaft-side pulley 23 via a timing belt 25 . The drive shaft 21 is attached to the drive shaft side pulley 23 , and the multi-turn rotary encoder 30 is directly attached directly below the drive shaft 21 without going through a reduction mechanism or the like. By attaching the multi-turn rotary encoder 30 to the driving shaft 21 as in the configuration of FIG. 2 , the rotational position information of the driving shaft 21 can be detected more accurately.

In addition, the tension pulley 24 increases the interlock between the motor 20 and the drive shaft 21 by applying tension to the timing belt 25 . The drive shaft 21 is connected to the handle shaft 27 by the bevel gear 26 . A handle interlock 28 is attached to the handle shaft 27 . For example, when an operator manually switches the tap using the handle during maintenance or the like, the handle is restricted by the handle interlock 28 so as to avoid electric operation.

FIG. 3 is a diagram showing the configuration of the electric operating device for the tap changer shown in FIG. 1 from the viewpoint of hardware. In the example of FIG. 3 , the electric operating device 1 for a tap changer includes a motor 20 , a multi-turn rotary encoder 30 , a power receiving unit 200 , an NFB (No Fuse Breaker) 210 , and a motor switch 220 , a power conversion unit 230 , an in-panel operation switch 240 , a trip relay 250 , a control board 260 , a display device 270 , and a host board 280 . Here, the in-disk operation switch 240 corresponds to the operation unit 110 , and the upper substrate 280 corresponds to the upper disk operation unit 10 . In addition, the control board 260 corresponds to the operation control unit 100 .

The power supply (for example, three-phase AC 210 [V]) supplied to the motor 20 is output to the motor switch 220 via the NFB 210 as a wiring breaker through the power receiving unit 200 and supplied to the motor 20 .

The in-panel operation switches 240 further include a step-up switch for causing the control board 260 to execute processing by step-up control, a step-down switch for executing step-down control, and an execution switch for executing stop control. In addition, the in-panel operation switch 240 may include a remote switch that remotely controls step-up, step-down, or stop.

In addition, control signals (for example, step-up control or step-down control) from the in-disk operation switch 240 and the upper substrate 280 are input to the control substrate 260 . The control board 260 operates the motor switch 220 in response to the input control signal, and controls the rotation of the motor 20 in the step-up direction, the rotation in the step-down direction, or the brake to stop the rotation.

The trip relay 250 is a circuit that trips (cuts the power supply) the NFB 210 by receiving a command from the control board 260 when the control board 260 senses a runaway state. In addition, when the stop switch is pressed by the in-panel operation switch 240 , the trip relay 250 trips the NFB 210 . By the power cut-off control by the trip relay 250 , for example, damage to the transformer due to runaway can be avoided.

The power conversion unit 230 converts the power supplied from the power reception unit 200 via the NFB 210 to the DC voltage 24 [V] used in the control board 260 . The electric operating device 1 for a tap changer according to the embodiment does not have a mechanical structure such as a stepping control mechanism or a dial switch, but controls the motor 20 by electronic control based on information detected by the multi-turn rotary encoder 30 . , the control current to the motor switch 220 can be made small. In addition, it is possible to reduce the size and capacity of the motor shutter 220 .

In addition, when the power supply is cut off due to a power failure or the like, control in the control board 260 is no longer possible. Therefore, the power conversion unit 230 outputs a command to the trip relay 250 via the control board 260 before the power supply is completely lost. . Thereby, the trip relay 250 trips the NFB 210 based on a command, and shuts off a motor power supply.

The control board 260 includes, for example, an FPGA 262 . The FPGA 262 executes, for example, the functions in each configuration of the switching control unit 120 described above. In addition, the control board 260 performs counter control related to switching of taps using a binary counter that stores the rotational position information detected by the multi-turn rotary encoder 30 in a register. For example, based on the binary counter, the control board 260 controls the tap switching position, stop position, and limit values of the taps (for example, the upper limit position of the tap during boosting, the lower limit position of the tap during bucking), Alternatively, setting information including at least one of the intermediate tap positions is parameterized and stored in a register or the like. In addition, the control board 260 monitors the state of the tap changer LTC under load based on the stored parameters. In addition, the control board 260 performs display control on the display device 270 based on the monitoring results and the like.

The display device 270 is, for example, an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence) display device, or the like. In addition, the display device 270 displays information input and output through the control board 260, monitoring results, abnormal states, and the like in a predetermined display format.

Next, the tap switching control of the embodiment will be described. FIG. 4 is a diagram for explaining tap switching control at the time of boosting. In FIG. 4 , the relationship between the switching of the taps at the time of boosting and the rotation number of the driving shaft 21 obtained from the multi-turn rotary encoder 30 is shown. In the following description, by rotating the driving shaft 21 33 times, the tap of the tap changer LTC under load switches one tap. In addition, in the example of FIG. 4 , a schematic diagram is shown in which the standard start position at the switching point of the tap at the time of boosting is 0 [degree], and the standard end position after the switching is completed is 180 [degree].

The operation control unit 100 performs control to rotate the main shaft 21 in the first direction from the initial value (standard start position 0 [degrees]) at the time of tap switching at the time of boosting, and performs a normal stop after 33 rotations Position 180[degrees] Control to stop rotation. However, in fact, during the period from when the operation control unit 100 outputs the control signal for stopping the motor 20 until the motor 20 actually stops, an overstroke occurs by two rotations from the standard stop position, and the actual stop position becomes smaller than the standard stop position. the stop position and move forward two rotations.

FIG. 5 is a diagram for explaining the tap switching control in the case where the boosting control is further performed after the boosting control. In the example of FIG. 5 , the relationship between tap switching and the number of revolutions of the driving shaft 21 obtained from the multi-turn rotary encoder 30 is shown when the boost control is further performed after the boost control of FIG. 4 . For example, when the operation control unit 100 further performs the boosting control after the boosting control, the driving shaft 21 is rotated in the same direction (first direction) as the previous time, so that the motor 20 is driven by the position where the motor 20 stopped last time as a reference. The tap is switched by rotating the shaft 21 33 times.

FIG. 6 is a diagram for explaining tap switching control in the case where step-down control is performed after step-up control. In addition, in the example of FIG. 6, it is assumed that the step-down control is performed after the step-up control shown in FIG. 5 is performed. When the step-up control is switched to the step-down control, the rotation direction of the driving shaft 21 becomes the direction opposite to the first direction (the second direction). Therefore, if the rotation control is performed without considering the amount of overstroke, the timing of the stop may be deviated, and the tap switching control may not be performed correctly. Therefore, the operation control unit 100 rotates the driving shaft 21 until the number of rotations due to overtravel is added to the 33 rotations required for switching the tap when the control is switched from boosting to decreasing. up to the number of rotations.

Specifically, as shown in FIG. 6 , the operation control unit 100 executes control for a total of 37 rotations by adding 33 rotations required for switching the taps by an additional 4 rotations. It is obtained by adding the 2 revolutions of the overstroke amount of the boost control for the second time to the 2 revolutions of the overstroke caused by the pressure reduction control. In addition, although the above-mentioned process shows the case of switching from step-up to step-down, when switching from step-down to step-up, the control of 37 rotations is similarly executed.

FIG. 7 is a diagram for explaining the tap switching control in the case where the step-down control is further performed after the step-down control. In the example of FIG. 7 , the relationship between tap switching and the number of revolutions of the driving shaft 21 obtained from the multi-turn rotary encoder 30 is shown in the case where the step-down control is further performed after the step-down control of FIG. 6 . For example, when the operation control unit 100 further performs the pressure reduction control after the pressure reduction control, since the driving shaft 21 is rotated in the same direction (second direction) as the previous time, the motor 20 is driven by the position where the motor 20 stopped last time as a reference. The tap is switched by rotating the shaft 21 33 times. In this case, an overstroke of two rotations is also generated.

In this way, when the operation control unit 100 performs the rotation control in the same direction as the previous rotation control, such as from boosting to boosting or from decreasing to lowering, the operation control unit 100 performs the rotation control for the amount of rotation 33 times. When performing rotation control in the opposite direction to the previous rotation control, such as from boosting to lowering or from bucking to boosting, the control of the rotation amount is performed 37 times. Thereby, the operation control unit 100 can realize appropriate tap switching control.

In addition, the operation control unit 100 may store, as a tap switching control table, the tap switching at the time of voltage boosting and the time of reducing the tap and the information related to the number of revolutions in association with each other, and execute the steps at the time of boosting and falling on the basis of the tap switching control table. Rotation control while pressing.

FIG. 8 is a diagram for explaining the state of the tap switching control at the time of step-up and the time of step-down using the tap change control table. In FIG. 8 , T1 , T2 , . . . , TN show identification information for identifying the tap after switching, and the number of revolutions related to tap switching at the time of step-up and step-down. In the example of FIG. 8, it is shown that the control of 33 rotations is performed in the case of switching the tap from boost to boost or from buck to buck, and the control is performed from boost to buck or from buck to boost. Rotation control of 37 rotations including 4 rotations of overtravel is performed at the timing of changing the action direction when pressing. In this way, by performing the switching control of the tap position in consideration of the number of rotations based on the rotational direction, it can be realized by electronic control of the operation control unit 100 without performing the control for the overstroke in a mechanical configuration.

In addition, in the embodiment, by using the multi-turn rotary encoder 30, the number of rotations of the main shaft 21 caused by the actual switching of the taps and the number of rotations detected from the multi-turn rotary encoder 30 are matched, so that it is possible to The abnormal state (blocking) when the standard stop position cannot be obtained and the abnormal state (runaway) exceeding the standard stop position are obtained, and control such as ending the process is performed. In addition, the jammed state can be grasped from the control time and the stop position, and the runaway state can be grasped from the number of revolutions obtained from the multi-turn rotary encoder 30 .

Next, the processing of the electric operating device for the tap changer according to the embodiment will be described. 9 is a flowchart showing an example of processing performed by the electric operating device for a tap changer according to the embodiment. In the process of FIG. 9, the monitoring part 124 inputs the encoder signal from the multi-turn rotary encoder 30 (step S100). The output signal of the multi-turn rotary encoder 30 is output as an electrical signal such as a 16-bit Gray code. Therefore, the monitoring unit 124 converts the input Gray code into an electronic signal such as a BCD (Binary Coded Decimal) code that can be recognized by the operation control unit 100 (step S102 ).

Next, the monitoring unit 124 decomposes the converted electrical signal into a signal for a rotation angle of a single-turn rotation and a signal for a multi-turn rotation count, and stores them in a register. Specifically, the monitoring unit 124 obtains the rotation angle and stores it in a 5-bit register (register A) (step S104 ), and obtains the rotation number and tap position and stores it in an 11-bit register (register B) (step S106 ). The number of spins can be stored up to, for example, 2048 spins, but is not limited to this.

Next, the operation accepting unit 122 accepts a step-up command or a step-down command to the load-time tap changer LTC using the operation unit 110 or the upper disk operation unit 10 (step S108 ). Next, the command control unit 126 drives the motor by outputting a rotation control command for driving the motor 20 to the motor drive control unit 130 based on the command content (step S110 ). Next, the monitoring unit 124 detects a change in the rotational position information from the multi-turn rotary encoder 30 due to the driving of the motor 20 (step S112).

Next, the monitoring unit 124 monitors the time (first time) from the output of the rotation command to the operation of the multi-turn rotary encoder 30 (step S114). Next, the monitoring unit 124 monitors the time (second time) from the operation of the multi-turn rotary encoder 30 until the tap is switched (step S116). Next, the monitoring unit 124 determines whether the first time or the second time has expired (step S118). Regarding the determination of whether to time out, for example, when the first time exceeds the first threshold value Th1 or when the second time exceeds the second threshold value Th2, it is determined as time out.

If the first time or the second time has not timed out, the monitoring unit 124 monitors the change of the binary counter at the time of boosting or decreasing the voltage (step S120 ), and judges whether the control is normal based on the value of the changed binary counter (step S122 ). ). For example, in the processing of steps S120 and S122, the monitoring unit 124 monitors whether the rotational direction of the motor 20 during the boost control and the rotational direction of the motor 20 during the step-down control match. When the control is not normal, the output unit 128 outputs error information indicating that the control is not normal (step S124). In addition, when the control is normal, the monitoring unit 124 executes the stop control process (step S200).

In addition, in the process of step S118, when the first time or the second time expires, it is determined that the block is blocked, and abnormal processing is executed (step S300). Thereby, the processing of this flowchart ends.

Next, the stop control process of step S200 will be described. FIG. 10 is a flowchart showing an example of a stop control process according to the embodiment. In the example of FIG. 10, the monitoring part 124 acquires the information about the position which should brake the motor 20 by stop control (step S202). The position to be braked is, for example, the position set at the X-th rotation-angle Y [degree] in the number of rotations (eg, 33 rotations) actually rotated. This is because, for example, when a stop control signal for stopping the motor 20 is output when the rotation position is the angle 0 [degree] of the 33rd rotation, the motor 20 rotates a few times more due to inertia, so the Brake before reaching the actual stop position. As an example of the above-mentioned values of X and Y, for example, X=31 and Y=120. In addition, the position to be braked is acquired by the position register of the register A and the register B described above.

Next, the monitoring unit 124 judges whether or not it is the timing to brake the motor 20 (hereinafter referred to as the braking timing) based on the information on the position to be braked (step S204 ). When it is not the braking timing, the monitoring unit 124 calculates the next stop position (step S206). In the process of step S206, the position register to be stopped next is calculated based on the values of the register A and the register B. Specifically, when the current step-up control is performed and the next step is to step-up control, +33 is added to the current position register corresponding to the number of revolutions, and the current step-down is performed but the next step-up is performed. In the case of , add +37 to the current position register. In addition, in the case of the current step-down and the next step-down, add -33 to the current position register, and in the case of the current step-up but the next step-down, add -33 to the current position register -37.

Next, the monitoring unit 124 determines whether or not the motor 20 has stopped (step S208). When the motor is stopped, the output unit 128 notifies the outside or the like that the motor has stopped (step S210 ), and ends the movement by one tap (step S212 ). In addition, in the process of step S204, when it is the braking timing, the command control unit 126 outputs a stop control command to the motor drive control unit 130 (step S216). Next, the monitoring unit 124 starts the stop timer (step S218).

After the process of step S218 is completed or when the motor 20 is not stopped during the process of step S208, the monitoring unit 124 checks the stop timer (step S220). Next, it is determined whether the stop timer has timed out (step S222). Regarding the determination of whether the stop timer has timed out, for example, when the count value (third time) of the stop timer exceeds the third threshold value Th3, it is determined as timed out. In the case of a timeout, the monitoring unit 124 determines that the control is out of control and performs abnormal processing (step S400). In addition, in the process of step S222, when it does not time out, it returns to the process of step S208. Thereby, this flowchart ends.

Next, the exception processing when it is determined that it is blocked will be described using a flowchart. FIG. 11 is a flowchart showing an example of exception processing at the time of blocking according to the embodiment. In the example of FIG. 11 , the command control unit 126 outputs a stop control command to the motor drive control unit 130 (step S302 ). Next, the output unit 128 displays an abnormality indicating the blocking state (step S304). The abnormality display in the process of step S304 may be, for example, a display such as turning on an LED for abnormality detection of a blockage, or a display showing a blockage state on the display device 270 . Thereby, the processing of this flowchart ends.

Next, the abnormal processing when it is determined that the control is out of control will be described using a flowchart. FIG. 12 is a flowchart showing an example of abnormal processing at the time of runaway according to the embodiment. In the example of FIG. 12, the monitoring part 124 implements the forced trip in NFB210 (step S402). Next, the output unit 128 displays an abnormality indicating the runaway state (step S404). The abnormality display in the process of step S404 may be, for example, a display such as turning on an LED for detecting a runaway abnormality, or a display showing the runaway state on the display device 270 . Thereby, the processing of this flowchart ends.

According to at least one of the embodiments described above, the electric operating device 1 for a tap changer includes the motor drive control unit 130 that drives the driving shaft 21 by the motor 20 to switch the taps of the tap changer LTC, and the multi-turn rotary encoder 30 , has a component that rotates n times with respect to the driving shaft 21 , and detects the rotational position of the driving shaft 21 by detecting the rotational position of the component; the monitoring unit 124 detects the rotational position based on the multi-turn rotary encoder 30 , to monitor the state of the tap changer LTC, and the switching control unit 120 to control the motor drive control unit 130 based on the monitoring result of the monitoring unit 124 , thereby simplifying the adjustment at the time of assembling the electric operation device and realizing easy maintenance.

Specifically, according to at least one embodiment, a multi-turn rotary encoder 30 capable of acquiring absolute position information of a multi-turn rotation is obtained by replacing a mechanical structure such as a stepping control mechanism and a dial switch of a conventional electric operation device with a multi-turn rotary encoder 30 . With the electronic control of the operation control unit 100, the number of mechanical components can be reduced, and space saving can be achieved. In addition, by directly connecting the multi-turn rotary encoder 30 directly below the driving shaft 21 without going through a reduction mechanism, and acquiring the output absolute position information to the operation control unit 100, it is possible to more accurately grasp the exact position of the driving shaft. The number of rotations (equivalent to the tap position and the number of spindle rotations) and the rotation angle. Therefore, according to the present embodiment, it is possible to detect accurate stopping accuracy due to improved resolution, halfway stop due to blockage of the driving shaft, or abnormality that causes unfollowing tap blocking, or runaway abnormality in which the operation exceeds the standard control position. state. Further, according to the present embodiment, the rotation position information can be detected with high accuracy by the multi-turn rotary encoder 30, and as a result, the motor stop accuracy can be improved. In addition, according to the present embodiment, the multi-turn rotary encoder 30 can perform position detection in a non-contact manner without using a dial switch, thereby reducing the load on the motor 20 and improving durability.

In the embodiment, for example, the tap switching operation by the operation control unit 100 may be statistically learned, and the automatic adjustment of the braking timing and the calculation of the tap switching speed may be performed when the tap is switched. As a result, the operation control unit 100 can grasp the malfunction of the motor 20, the malfunction state of the tap changer LTC main body at the time of load, and the like.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in other various forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the invention described in the claims and their equivalents.

Claims (as amended by Article 19 of the Treaty)

1. (delete)

2. (delete)

3. (After modification) An electric operating device for a tap changer, comprising:

The driving part uses the motor to drive the driving shaft to switch the tap of the tap switcher;

A multi-turn rotary encoder, which has a component that rotates n times with respect to the driving shaft, and detects the rotational position of the driving shaft by detecting the rotational position of the component;

a monitoring unit that monitors the state of the tap changer based on the rotational position detected by the multi-turn rotary encoder; and

a control unit that controls the driving unit based on the monitoring result of the monitoring unit,

The monitoring unit determines whether or not the tap changer is in an abnormal state based on the rotational position information and time information of the motor detected by the multi-turn rotary encoder, and outputs the output from the control unit to the motor. When the first time from the start of the rotation control command to the change of the rotational position information detected by the multi-turn rotary encoder exceeds the first threshold, or from the rotation detected by the multi-turn rotary encoder When the second time from the start of the position information change to the tap switching exceeds a second threshold, it is determined that the tap switch is in a blocked state.

4. (After modification) An electric operating device for a tap changer, comprising:

The driving part uses the motor to drive the driving shaft to switch the tap of the tap switcher;

A multi-turn rotary encoder, which has a component that rotates n times with respect to the driving shaft, and detects the rotational position of the driving shaft by detecting the rotational position of the component;

a monitoring unit that monitors the state of the tap changer based on the rotational position detected by the multi-turn rotary encoder; and

a control unit that controls the driving unit based on the monitoring result of the monitoring unit,

The monitoring unit determines whether or not the tap changer is in an abnormal state based on the rotational position information and time information of the motor detected by the multi-turn rotary encoder, and outputs the output from the control unit to the motor. When the third time from the start of the stop control to the stop of the motor exceeds a third threshold value, it is determined that the tap changer is in a runaway state.

5. (modified) The electric operating device for a tap changer according to claim 3 or 4, wherein,

The monitoring unit includes at least one of a tap switching position, a stop position, a limit value of a tap, or an intermediate tap position in the tap changer based on the rotational position information detected by the multi-turn rotary encoder. The setting information included is parameterized for monitoring.

6. (Modified) A tap switching method, wherein the tap changer performs the following steps with an electric operating device:

The drive shaft is driven by the motor driven by the drive unit to switch the tap of the tap changer,

The rotational position of the driving shaft is detected by detecting the rotational position of the member using a multi-turn rotary encoder having a member that rotates n times with respect to the driving shaft,

monitoring the state of the tap changer based on the rotational position detected by the multi-turn rotary encoder,

Based on the monitoring result, the drive unit is controlled by the control unit,

Furthermore, regarding the monitoring of the state of the tap changer, it is determined whether the tap changer is in an abnormal state based on the rotational position information and time information of the motor detected by the multi-turn rotary encoder,

When the first time from the output of the rotation control command of the motor by the control unit to the change of the rotational position information detected by the multi-turn rotary encoder exceeds the first threshold value, or from the When the second time from the start of the change in the rotational position information detected by the multi-turn rotary encoder until the tap switching exceeds a second threshold value, it is determined that the tap switching device is in a blocked state.

7. (Additional) A tap switching method, wherein the tap changer performs the following steps with an electric operating device:

The drive shaft is driven by the motor driven by the drive unit to switch the tap of the tap changer,

The rotational position of the driving shaft is detected by detecting the rotational position of the member using a multi-turn rotary encoder having a member that rotates n times with respect to the driving shaft,

monitoring the state of the tap changer based on the rotational position detected by the multi-turn rotary encoder,

Based on the monitoring result, the drive unit is controlled by the control unit,

Furthermore, regarding the monitoring of the state of the tap changer, it is determined whether the tap changer is in an abnormal state based on the rotational position information and time information of the motor detected by the multi-turn rotary encoder,

The tap changer is determined to be in an out-of-control state when the third time period from the start of the output of the stop control of the motor by the control unit to the stop of the motor exceeds a third threshold value.

Claims (6)

1. An electric operating device for a tap changer, comprising: The driving part uses the motor to drive the driving shaft to switch the tap of the tap switcher; A multi-turn rotary encoder, which has a component that rotates n times relative to the driving shaft, and detects the rotational position of the driving shaft by detecting the rotational position of the component; a monitoring unit that monitors the state of the tap changer based on the rotational position detected by the multi-turn rotary encoder; and A control unit controls the driving unit based on a monitoring result of the monitoring unit. 2. The electric operating device for a tap changer according to claim 1, wherein: The monitoring unit determines whether or not the tap changer is in an abnormal state based on the rotational position information and time information of the motor detected by the multi-turn rotary encoder. 3. The electric operating device for a tap changer according to claim 2, wherein: When the first time from the output of the rotation control command of the motor by the control unit to the change of the rotational position information detected by the multi-turn rotary encoder exceeds the first threshold value, or from the The monitoring unit determines that the tap changer is in a blocked state when the second time period from the start of the change in the rotational position information detected by the multi-turn rotary encoder until the tap switching exceeds a second threshold value. 4. The electric operating device for a tap changer according to claim 2 or 3, wherein: The monitoring unit determines that the tap changer is in an out-of-control state when a third time period from when the control unit outputs the stop control of the motor until the motor stops exceeds a third threshold value. 5. The electric operating device for a tap changer according to any one of claims 1 to 4, wherein: The monitoring unit includes at least one of a tap switching position, a stop position, a limit value of a tap, or an intermediate tap position in the tap changer based on the rotational position information detected by the multi-turn rotary encoder. The setting information included is parameterized for monitoring. 6. A tap switching method, wherein the tap changer uses an electric operating device to perform the following steps: The drive shaft is driven by the motor driven by the drive unit to switch the tap of the tap changer, The rotational position of the driving shaft is detected by detecting the rotational position of the member using a multi-turn rotary encoder having a member that rotates n times with respect to the driving shaft, monitoring the state of the tap changer based on the rotational position detected by the multi-turn rotary encoder, The drive unit is controlled based on the monitoring result.

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