CN112136195A

CN112136195A - Electric operation device for tap changer and tap changing method

Info

Publication number: CN112136195A
Application number: CN201880093559.XA
Authority: CN
Inventors: 富冈和美; 石川拓; 江口直纪
Original assignee: Toshiba Corp; Toshiba Energy Systems and Solutions Corp
Current assignee: Toshiba Corp; Toshiba Energy Systems and Solutions Corp
Priority date: 2018-06-19
Filing date: 2018-06-19
Publication date: 2020-12-25
Anticipated expiration: 2038-06-19
Also published as: JP6961821B2; EP3813086A4; JPWO2019244235A1; EP3813086A1; WO2019244235A1; CN112136195B

Abstract

An electric operation device for a tap changer according to an embodiment includes a driving unit, a multi-turn rotary encoder, a monitoring unit, and a control unit. The driving section drives the driving shaft by a motor to switch a tap of the tap changer. The multi-turn rotary encoder has a member that rotates n times with respect to the drive shaft, and detects the rotational position of the drive 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 a monitoring result of the monitoring unit.

Description

Electric operation device for tap changer and tap changing method

Technical Field

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

Background

Conventionally, there is known an electric operation device that switches the position of a tap changer when the electric operation device is installed in a load of a transformer. The electric operation device switches the position of a tap by rotating a drive shaft coupled to a gear by a motor driving unit serving as power. The operation control of the motor driving unit is executed by a step control mechanism composed of a relay sequence circuit based on a motor switch for performing an opening and closing operation of a circuit, by an opening/closing signal of a cam switch connected to a drive shaft via a gear. The electric operation device further includes a dial switch coupled to the drive shaft via 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 includes a mechanical structure such as a step control mechanism and a dial switch as described above, the number of components is large, and assembly and maintenance may take time. Further, at the time of assembly or maintenance, a worker familiar with the mechanism structure is required to perform work, and there is a case where repair or maintenance cannot be easily performed due to lack of workability at the time of maintenance. In addition, conventionally, the position information of the tap can be obtained by a dial switch, but this signal is used to grasp the limit (limit value) of the tap and is not effectively used in the operation control of the electric operation device.

Prior art documents:

patent documents:

patent document 1 Japanese patent laid-open publication No. Sho 54-129367

Patent document 2 Japanese Kokai publication No. 2010-502170

Disclosure of Invention

Problems to be solved by the invention

An object of the present invention is to provide an electric operating device for a tap changer and a tap changing method, which can simplify adjustment when assembling the electric operating device and can realize easy maintenance.

Means for solving the problems

Drawings

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

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

Fig. 3 is a diagram showing the configuration of the electrical operation device for a 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 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 tap change control in the case where step-down control is further performed after step-down control.

Fig. 8 is a diagram for explaining the tap change control in the case of voltage increase and voltage decrease using the tap change control table.

Fig. 9 is a flowchart showing an example of processing of the electric operation device for a tap changer according to the embodiment.

Fig. 10 is a flowchart showing an example of the stop control processing according to the embodiment.

Fig. 11 is a flowchart showing an example of exception handling at the time of congestion according to the embodiment.

Fig. 12 is a flowchart showing an example of the exception processing in the runaway state in the embodiment.

Detailed Description

Hereinafter, an electric operation device for a tap changer and a tap changing method according to the embodiment will be described with reference to the drawings. In the following embodiments, a load tap changer is used as an example of the tap changer.

Fig. 1 is a diagram showing a configuration example of an electric operation device for a tap changer according to an embodiment. The electric operation device 1 for a tap changer includes, for example, an upper disc 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 "driving unit".

The upper-level-disk operating unit 10 outputs a control signal to the operation control unit 100, the control signal being caused by an operation performed by an administrator or the like on an operating unit provided in the upper-level device. The control signal relating to the upper disk operating unit 10 includes, for example, a signal of upper control. The upper control refers to tap switching control accompanied by voltage increase control and voltage decrease control of the tap changer LTC for the load, for example.

The motor 20 rotates a rotatable shaft (for example, a drive shaft 21 described later) in a predetermined direction, thereby switching the position of a tap (a connection point along a winding of which a constant number of rotations can be selected) of the tap changer LTC at the time of loading. The motor 20 rotates the drive shaft in the opposite direction by, for example, the voltage-up control and the voltage-down control. The electric operation device 1 for a tap changer changes the winding ratio of a transformer of the tap changer LTC when the load is set by switching the position of the tap changer LTC when the load is set by the motor 20, and adjusts the voltage of the transformer. The component structure of the motor 20 of the embodiment will be described in detail later.

The multi-turn rotary encoder 30 is mounted directly below a drive shaft that is rotated by driving of the motor 20, for example. The multi-turn rotary encoder 30 has a member that rotates n (n > 0) times with respect to the main shaft, and detects the rotational position of the main shaft by detecting the rotational position of the member. The multi-turn rotary encoder 30 outputs the detected rotational position information to the operation control unit 100. The rotational position information is, for example, absolute position information (absolute value) including a rotation angle and the number of rotations of the main shaft for a plurality of rotations. The multi-turn rotary encoder 30 outputs rotational position information when the rotational position of the main shaft changes (when the rotational angle is deviated 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). Some or all of these components may be realized by hardware (Circuit section, including Circuit) such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), GPU (Graphics Processing Unit), or the like, or may be realized by 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 attached to the hdd (hard Disk drive) or the flash memory of the operation control unit 100 by attaching the storage medium to the drive device.

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

The switching control unit 120 includes, for example, an operation receiving 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 receiving unit 122 receives a control signal instructing tap changing by voltage increase or voltage decrease of the load tap changer LTC from the operation unit 110 or the upper panel operation unit 10.

The monitoring unit 124 monitors the state of the tap changer LTC during loading 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 during the load on the basis of the position and the 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 drive shaft rotated by the motor 20. The monitoring unit 124 derives the position of the tap changer LTC at the time of loading based on the rotation angle and the number of rotations. The monitoring unit 124 monitors the state of the load tap changer LTC (whether it is a normal state or an abnormal state) based on the state of the motor 20 itself (for example, whether the motor 20 is being driven in accordance with an instruction from the instruction control unit 126). Here, the abnormal state of the tap changer LTC at the time of the load refers to, for example, a blocking state or an out-of-control state. The blocked state refers to, for example, a state in which the motor 20 is not rotated for a predetermined time after the rotation control command is output, or a state in which the time from the start of the operation of the motor 20 to the tap change exceeds a predetermined time. The runaway state refers to a state in which the driving of the motor 20 is continued although a stop control command is output to the motor 20 based on the end of switching of the tap changer LTC under load, for example. The monitoring unit 124 stores and manages the rotational position information obtained from the multi-turn rotary encoder 30 in a predetermined register by a counter value such as a binary counter.

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

The output unit 128 outputs the state of control by the operation control unit 100 (for example, the monitoring result by the monitoring unit 124), and the like. For example, the output unit 128 outputs a control signal such as an in-operation signal to the upper tray operating unit 10 at a predetermined timing as a signal for upper notification. The operation signal is, for example, a signal that is expressed as 1 when the motor 20 is in operation and is expressed as 0 when the motor 20 is stopped. The output unit 128 includes, for example, a light Emitting unit (e.g., an led) for notifying a processing state and a display device for displaying an image. For example, when an error or an abnormality occurs in the tap switching control, the output unit 128 turns on an LED for abnormality detection, or displays that an abnormality has occurred on the display device.

Upon receiving the rotation control signal from the switching control unit 120, the motor drive control unit 130 rotates the motor 20 in a predetermined direction to switch the tap by the step control. When receiving the stop control signal from the switching control unit 120, the motor drive control unit 130 performs drive control for stopping the rotation of the motor 20.

Next, the component structure of the motor 20 in the embodiment will be explained. Fig. 2 is a diagram showing an example of a component configuration 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 tension pulley 24, a timing belt (timing belt)25, a bevel gear 26, a handle shaft 27, and a handle interlock 28. In the example of fig. 2, a multi-turn rotary encoder 30 is also shown.

In the motor 20, a motor-side pulley 22 is attached to a rotating shaft, and is coupled to a 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 to the position directly below the drive shaft 21 without a reduction mechanism or the like. By attaching the multi-turn rotary encoder 30 to the main shaft 21 as in the configuration of fig. 2, the rotational position information of the main shaft 21 can be detected more accurately.

The tension pulley 24 applies tension to the timing belt 25, thereby improving the interlocking between the motor 20 and the main shaft 21. The drive shaft 21 is coupled to a handle shaft 27 by a bevel gear 26. A handle interlock 28 is attached to the handle shaft 27. For example, in the case where an operator manually switches the tap by using a handle during maintenance or the like, the handle is restricted by the interlock 28 so as not to be operated electrically.

Fig. 3 is a diagram showing the configuration of the electrical operation device for a tap changer shown in fig. 1 from the viewpoint of hardware. In the example of fig. 3, the electric operation 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, a motor switch 220, a power supply switching unit 230, an in-tray operation switch 240, a trip relay 250, a control board 260, a display device 270, and an upper board 280. Here, the in-disk operation switch 240 corresponds to the operation unit 110, and the upper board 280 corresponds to the upper-disk operation unit 10. The control board 260 corresponds to the operation control unit 100.

A power supply (for example, a three-phase ac 210V) supplied to the motor 20 is output to a motor switch 220 through an NFB210 as a wiring breaker by a power receiving unit 200, and is supplied to the motor 20.

The in-board operation switch 240 further includes 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. The on-board operation switch 240 may include a remote switch for remotely controlling the voltage increase, voltage decrease, or stop.

Control signals (for example, step-up control or step-down control) from the in-disk operation switch 240 and the upper board 280 are input to the control board 260. The control board 260 operates the motor shutter 220 using the input control signal as a trigger, and controls the motor 20 such as a brake that rotates in the voltage increasing direction, rotates in the voltage decreasing direction, or stops the rotation.

The trip relay 250 is a circuit that receives a command from the control board 260 and trips the NFB210 (power supply interruption) when the control board 260 senses a runaway state. In addition, when the stop switch is pressed by the in-tray operation switch 240, the trip relay 250 trips the NFB 210. By the power supply cutoff control based on the trip relay 250, damage to the transformer due to runaway, for example, can be avoided.

The power conversion unit 230 converts the power supplied from the power receiving unit 200 via the NFB210 into a dc voltage 24[ V ] used in the control board 260. The electric operation device 1 for a tap changer according to the embodiment does not include a mechanical structure such as a stepping control mechanism or a dial switch, and controls the motor 20 by electronic control based on information detected by the multi-turn rotary encoder 30, so that the control current to the motor switch 220 can be made small. Further, the motor shutter 220 can be reduced in size and volume.

Further, when the supply of power is cut off due to a power failure or the like, the control of the control board 260 is no longer possible, and therefore, the power supply converter 230 outputs a command to the trip relay 250 via the control board 260 until the supply of power is completely lost. Thus, the trip relay 250 trips the NFB210 based on the command, causing the motor power supply to be cut off.

The control board 260 includes, for example, an FPGA 262. The FPGA 262 executes, for example, the functions of the respective configurations of the switching control unit 120 described above. The control board 260 performs counter control related to tap switching by using a binary counter that stores, in a register, rotational position information detected by the multi-turn rotary encoder 30. For example, the control board 260 parameterises and stores setting information including at least one of a tap switching position, a stop position, a tap limit value (for example, an upper limit position of a tap at the time of voltage increase, a lower limit position of a tap at the time of voltage decrease), and an intermediate tap position of the tap switching device LTC at the time of load in a register or the like based on a binary counter. In addition, the control board 260 monitors the state of the tap changer LTC at the time of loading based on the stored parameters. The control board 260 performs display control on the display device 270 based on the monitoring result 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. The display device 270 displays information input and output through the control board 260, a monitoring result, an abnormal state, and the like in a predetermined display mode.

Next, tap change control according to the embodiment will be described. Fig. 4 is a diagram for explaining tap switching control at the time of boosting. Fig. 4 shows the relationship between the tap switching at the time of boosting and the number of rotations of the main shaft 21 obtained from the multi-turn rotary encoder 30. In the following description, the driving shaft 21 is rotated 33 times, so that the tap of the tap changer LTC is switched by one tap at the time of load. In the example of fig. 4, a schematic diagram is shown in which the standard start position at which the tap is switched during boosting is set to 0[ degrees ], and the standard end position after the end of switching is set to 180[ degrees ].

The operation control unit 100 performs control for rotating the main shaft 21 in the first direction from an initial value (standard start position 0[ degree ]) and performs control for stopping the rotation at a standard stop position 180[ degree ] after rotating 33 times at the time of tap switching during boosting. However, actually, during a period from when the operation control unit 100 outputs the control signal for stopping the motor 20 to when the motor 20 is actually stopped, the overstroke of the rotation amount occurs twice from the standard stop position, and the actual stop position is two more rotations ahead of the standard stop position.

Fig. 5 is a diagram for explaining tap switching control in the case where the boosting control is further performed after the boosting control. Fig. 5 shows an example of the relationship between the tap switching and the number of rotations of the master shaft 21 obtained from the multi-turn rotary encoder 30 when the boosting control is further performed after the boosting control of fig. 4. For example, when the boost control is further performed after the boost control, the operation control unit 100 rotates the main shaft 21 in the same direction (first direction) as the previous time, and therefore the tap is switched by rotating the main shaft 21 33 times with the position where the motor 20 was stopped in the previous time as a reference.

Fig. 6 is a diagram for explaining tap switching control in the case where step-down control is performed after step-up control. In the example of fig. 6, the step-up control shown in fig. 5 is executed and then the step-down control is executed. When the voltage raising control is switched to the voltage lowering control, the rotation direction of the primary shaft 21 is the opposite direction (second direction) to the first direction. Therefore, if the rotation control is performed without considering the amount of the over stroke, the timing of the stop may be deviated, and the tap switching control cannot be performed accurately. Therefore, when switching the control from the voltage increase to the voltage decrease, the operation control unit 100 rotates the main shaft 21 until the number of rotations obtained by adding the number of rotations by the overtravel to 33 rotations necessary for switching the tap is reached.

Specifically, as shown in fig. 6, the operation control unit 100 performs control for a total of 37 rotations by adding 33 rotations required for switching the tap and 4 rotations obtained by adding 2 rotations for canceling the amount of overtravel in the previous step-up control and 2 rotations for the overtravel due to the step-down control. Although the above-described processing shows the case of switching from the voltage increase to the voltage decrease, the control of 37 rotations is similarly executed even when switching from the voltage decrease to the voltage increase.

Fig. 7 is a diagram for explaining tap change control in the case where step-down control is further performed after step-down control. Fig. 7 shows an example of the relationship between the tap switching and the number of rotations of the master shaft 21 obtained from the multi-turn rotary encoder 30 when the step-down control is further performed after the step-down control of fig. 6. For example, when the voltage reduction control is further performed after the voltage reduction control, the operation control unit 100 rotates the main shaft 21 in the same direction (second direction) as the previous time, and therefore, the tap is switched by rotating the main shaft 21 33 times with reference to the position where the motor 20 was stopped in the previous time. In this case, too, an overtravel of twice the rotation amount is generated.

In this way, the operation control unit 100 performs the rotation control for 33 rotation amounts when performing the rotation control in the same direction as the previous rotation control such as the step-up to the step-up or the step-down to the step-down, and performs the rotation control for 37 rotation amounts when performing the rotation control in the opposite direction to the previous rotation control such as the step-up to the step-down or the step-down to the step-up. Thereby, the operation control section 100 can realize appropriate tap change control.

The operation control unit 100 may store tap switching at the time of voltage increase and voltage decrease and information on the number of rotations in association with each other as a tap switching control table, and may perform rotation control at the time of voltage increase and voltage decrease based on the tap switching control table.

Fig. 8 is a diagram for explaining the tap change control in the case of voltage increase and voltage decrease using the tap change control table. In fig. 8, T1, T2, …, TN show identification information for identifying a tap after switching and the number of rotations related to tap switching at the time of voltage increase and voltage decrease. In the example of fig. 8, the control of 33 rotations in the case of switching the tap from the step-up to the step-up or from the step-down to the step-down is shown, and the rotation control of 37 rotations including 4 rotations of the overtravel is performed at the timing of changing the operation direction in the case of the step-up to the step-down or from the step-down to the step-up. By performing the tap position switching control in which the number of rotations is taken into consideration based on the direction of rotation in this manner, it is possible to realize electronic control by the operation control unit 100 without performing the control for the overtravel with a mechanical configuration.

In the embodiment, since the number of rotations of the main shaft 21 caused by the actual tap switching is matched with the number of rotations detected by the multi-turn rotary encoder 30 by using the multi-turn rotary encoder 30, it is possible to obtain an abnormal state (jam) when the normal stop position is not reached and an abnormal state (runaway) when the normal stop position is exceeded, and to perform control such as ending the processing. In addition, the jam state can be grasped from the control time and the stop position, and the runaway state can be grasped from the number of rotations obtained from the multi-turn rotary encoder 30.

Next, a process of the electric operation device for a tap changer according to the embodiment will be described. Fig. 9 is a flowchart showing an example of processing of the electric operation device for a tap changer according to the embodiment. In the processing of fig. 9, the monitoring unit 124 receives an 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 (bit) gray code. Therefore, the monitoring unit 124 converts the input gray code into an electronic signal such as a bcd (binary Coded decoder) code that can be recognized by the operation control unit 100 (step S102).

Next, the monitoring unit 124 decomposes the converted electric signal into a signal for a rotation angle of one rotation and a signal for counting a plurality of rotations, and stores the signals in a register. Specifically, the monitoring unit 124 acquires the rotation angle and stores the rotation angle in a 5-bit register (register a) (step S104), and acquires the rotation number and the tap position and stores the rotation number in an 11-bit register (register B) (step S106). The number of revolutions can be stored up to 2048 revolutions, for example, but is not limited thereto.

Next, the operation receiving unit 122 receives a voltage increase command or a voltage decrease command for the load tap changer LTC by the operation unit 110 or the upper panel operation unit 10 (step S108). Next, the command control unit 126 outputs a rotation control command for driving the motor 20 to the motor drive control unit 130 based on the command content, and drives the motor (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 until 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 to the tap change (step S116). Next, the monitoring unit 124 determines whether the first time or the second time has timed out (step S118). The judgment of whether or not to time out is judged to be time out when the first time exceeds the first threshold Th1 or the second time exceeds the second threshold Th2, for example.

When 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 stepping down (step S120), and determines 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 or not the rotation direction of the motor 20 during the voltage increase control and the rotation direction of the motor 20 during the voltage decrease control coincide with each other. If the control is not normal, the output unit 128 outputs error information indicating that the control is not normal (step S124). When the control is normal, the monitoring unit 124 executes the stop control process (step S200).

In the process of step S118, when the first time or the second time is timed out, it is determined that the congestion occurs and an abnormal process is executed (step S300). This concludes the processing in the flowchart.

Next, the stop control processing in step S200 will be described. Fig. 10 is a flowchart showing an example of the stop control processing according to the embodiment. In the example of fig. 10, the monitoring unit 124 acquires information on the position at which the motor 20 is to be braked by the stop control (step S202). The position to be braked is, for example, a position set by the X-th rotation-angle Y [ degrees ] out of the number of rotations (for example, 33 rotations) actually rotated. This is because, for example, when a stop control signal for stopping the motor 20 is output at a timing at which the rotation position is at the 33 rd rotation angle of 0[ degree ], the motor 20 is additionally rotated a large number of times by inertia, and braking is performed before the actual stop position is reached. An example of the value X, Y is X-31 and Y-120. The position at which braking should be performed is obtained by the position registers of the register a and the register B.

Next, the monitoring unit 124 determines whether or not the timing to brake the motor 20 (hereinafter referred to as a brake timing) is based on the information on the position where braking is to be performed (step S204). If the timing is not the braking timing, the monitoring unit 124 calculates the position of the next stop (step S206). In the processing of step S206, a position register to be stopped next time is calculated based on the values of the register a and the register B. Specifically, when the current is the voltage increase control and the next time is also the voltage increase control, +33 is added to the current position register corresponding to the number of revolutions, and when the current is the voltage decrease but the next time is the voltage increase control, +37 is added to the current position register. When the current voltage is reduced and the next voltage is reduced, minus 33 is added to the current position register, and when the current voltage is increased and the next voltage is reduced, minus 37 is added to the current position register.

Next, the monitoring unit 124 determines whether the motor 20 is stopped (step S208). When the motor is stopped, the output unit 128 notifies the outside or the like that the motor is stopped (step S210), and ends the movement of one tap amount (step S212). In the process of step S204, if the timing 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 a stop timer (step S218).

After the process of step S218 is completed or when the motor 20 is not stopped in the process of step S208, the monitoring unit 124 checks a stop timer (step S220). Next, it is determined whether the stop timer has timed out (step S222). The judgment of whether or not the stop timer has timed out is, for example, judged as timed out when the count value (third time) of the stop timer exceeds the third threshold Th 3. When the time has elapsed, the monitoring unit 124 determines that the vehicle is out of control and performs an abnormality process (step S400). If the processing in step S222 is not a timeout, the process returns to step S208. This concludes the flowchart.

Next, the exception processing when it is determined that the congestion is caused will be described with reference to a flowchart. Fig. 11 is a flowchart showing an example of exception handling at the time of congestion 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 performs an abnormal display indicating the congestion state (step S304). The abnormality display in the process of step S304 may be, for example, a display in which an LED for detecting a blockage is turned on, or a display indicating a blockage state on the display device 270. This concludes the processing in the flowchart.

Next, an abnormality processing in the case of determining that the vehicle is out of control will be described with reference to a flowchart. Fig. 12 is a flowchart showing an example of the exception processing in the runaway state in the embodiment. In the example of fig. 12, the monitoring unit 124 performs forced tripping in the NFB210 (step S402). Next, the output unit 128 performs an abnormal display indicating the runaway state (step S404). The abnormality display in the process of step S404 may be, for example, a display in which an LED for detecting a runaway abnormality is turned on, or a display indicating a runaway state on the display device 270. This concludes the processing in the flowchart.

According to at least one embodiment described above, the electrical operation device 1 for a tap changer includes: a motor drive control unit 130 that switches the tap of the tap changer LTC by driving the main shaft 21 by the motor 20; a multi-turn rotary encoder 30 having a member that rotates n times with respect to the main shaft 21, the rotational position of the main shaft 21 being detected by detecting the rotational position of the member; a monitoring unit 124 for monitoring the state of the tap changer LTC based on the rotational position detected by the multi-turn rotary encoder 30; and a switching control unit 120 that controls the motor drive control unit 130 based on the monitoring result of the monitoring unit 124, whereby adjustment at the time of assembly of the electric operation device can be simplified, and easy maintenance can be achieved.

Specifically, according to at least one embodiment, the mechanical configuration of the conventional electric operation device, such as the step control mechanism and the dial switch, is replaced with the electronic control of the multi-turn rotary encoder 30 and the operation control unit 100, which can acquire absolute position information of a plurality of rotations, thereby reducing the number of mechanical components and saving space. Further, by directly connecting the multi-turn rotary encoder 30 directly below the main shaft 21 without a reduction mechanism and acquiring the outputted absolute position information to the operation control unit 100, it is possible to more accurately grasp the exact number of rotations (corresponding to the tap position and the main shaft rotation number) and the rotation angle of the main shaft. Therefore, according to the present embodiment, it is possible to detect an abnormal state in which the stop accuracy is accurate due to the improvement of the resolution, the stop is in the middle due to the drag of the master shaft, or the operation is out of control due to the tap jam which does not follow the operation, or the operation exceeds the standard control position. In addition, according to the present embodiment, the rotational 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 position is detected contactlessly by the multiturn rotary encoder 30 without using a dial switch, and the load on the motor 20 can be reduced to improve durability.

In the embodiment, for example, the tap switching operation by the operation control unit 100 may be statistically learned, and the braking timing at the time of tap switching may be automatically adjusted and the tap switching speed may be calculated. As a result, the operation control unit 100 can recognize a failure of the motor 20, a failure state of the tap changer LTC main body at the time of load, and the like.

While several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in other various manners, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.

The claims (modification according to treaty clause 19)

(deletion)

(modified) an electric operation device for a tap changer, comprising:

a driving unit for driving the driving shaft by a motor to switch the tap of the tap changer;

a multi-turn rotary encoder having a member that rotates n times with respect to the drive shaft, the rotary encoder detecting a rotational position of the drive shaft by detecting a rotational position of the member;

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

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

the monitoring unit determines whether the tap changer is in an abnormal state based on the rotational position information and the time information of the motor detected by the multi-turn rotary encoder, and determines that the tap changer is in a blocked state when a first time from when the control unit outputs a rotational control command for the motor until the rotational position information detected by the multi-turn rotary encoder changes exceeds a first threshold value or when a second time from when the rotational position information detected by the multi-turn rotary encoder changes to when the tap is switched exceeds a second threshold value.

(modified) an electric operation device for a tap changer, comprising:

the monitoring unit determines whether the tap changer is in an abnormal state based on the rotational position information and the time information of the motor detected by the multi-turn rotary encoder, and determines that the tap changer is in an out-of-control state when a third time from when the control unit outputs the stop control of the motor to when the motor stops exceeds a third threshold value.

(modified) electric operating device for a tap changer according to

claim

3 or 4, wherein,

the monitoring unit parameterizes setting information including at least one of a switching position, a stop position, a tap limit value, or an intermediate tap position of a tap in the tap changer based on rotational position information detected by the multi-turn rotary encoder, and monitors the information.

(modified) a tap changing method, wherein the tap changer is electrically operated to perform the steps of:

the tap of the tap changer is switched by driving the driving shaft by a motor driven by the driving part,

detecting a rotational position of a member by using a multi-turn rotary encoder having the member rotating n times with respect to the motive shaft, thereby detecting the rotational position of the motive shaft,

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

controlling the driving part by a control part based on the monitoring result,

further, the monitoring of the state of the tap changer determines whether or not the tap changer is in an abnormal state based on the rotational position information and the time information of the motor detected by the multi-turn rotary encoder,

the tap changer is determined to be in a blocking state when a first time from when a rotation control command of the motor is output by the control unit to when the rotation position information detected by the multi-turn rotary encoder changes exceeds a first threshold value or when a second time from when the rotation position information detected by the multi-turn rotary encoder changes to when the tap is switched exceeds a second threshold value.

(addition) a tap changing method, wherein the tap changer is electrically operated to perform the steps of:

controlling the driving part by a control part based on the monitoring result,

when a third time period from when the control unit outputs the stop control of the motor to when the motor stops exceeds a third threshold value, it is determined that the tap changer is in the runaway state.

Claims

1. An electric operation device for a tap changer, comprising:

and a control unit that controls the drive unit based on a monitoring result of the monitoring unit.

2. The electrical operating device for a tap changer according to claim 1,

the monitoring unit determines whether or not the tap changer is in an abnormal state based on the rotational position information and the time information of the motor detected by the multi-turn rotary encoder.

3. The electrical operating device for a tap changer according to claim 2,

the monitoring unit determines that the tap changer is in a blocking state when a first time from when the control unit outputs a rotation control command for the motor until when the rotation position information detected by the multi-turn rotary encoder changes exceeds a first threshold value or a second time from when the rotation position information detected by the multi-turn rotary encoder changes until when the tap change occurs exceeds a second threshold value.

4. The electrical operating device for a tap changer according to claim 2 or 3,

the monitoring unit determines that the tap changer is in a runaway state when a third time from when the control unit outputs the stop control of the motor until the motor stops exceeds a third threshold value.

5. The electrical operating device for a tap changer according to any one of claims 1 to 4,

6. A tap changing method, wherein the tap changer is electrically operated to perform the steps of:

controlling the driving part based on the monitoring result.