JP7021393B2 - Electric operation device for tap changer and tap changer method - Google Patents

Description

An embodiment of the present invention relates to an electric operation device for a tap changer and a tap changer method.

At substations and the like, voltage conversion is performed by a transformer so that the electric power generated at the power plant can be efficiently transmitted. Since the above voltage decreases when the demand for power consumption increases and increases when the demand decreases, it is necessary to constantly adjust the voltage to an appropriate voltage and supply stable power to the consumer. Therefore, in the conventional method, a load tap changer that changes the number of turns on the primary side of the transformer to change the voltage on the secondary side is used, and by switching the tap, the voltage is adjusted without causing a power failure even during power generation. It has been known.

The tap changer under load requires an electric operating device that houses a drive device that switches taps using a motor. Since the above drive device is structurally composed of many mechanical parts, wear between the parts, grease shortage of gears, astringency due to aging, etc. occur, and the tap stop position at the time of tap switching. Will deviate from the target regular stop position. As a result, it was not possible to adjust to the target voltage, and there was a possibility that stable power could not be supplied to consumers. In addition, in the past, periodic inspections were performed to adjust the amount of deviation described above, but in order to perform the inspection, it is necessary to stop power generation for safety, and because the amount of deviation cannot be grasped, workers There were cases where adjustments varied.

Japanese Unexamined Patent Publication No. 2000-22331

An object to be solved by the present invention is to provide an electric operation device for a tap changer and a tap changer method capable of more accurately acquiring the amount of deviation of the stop position of the tap.

The electric operation device for a tap changer of the embodiment has a reception unit, a drive unit, a detection unit, and a derivation unit. The reception unit receives the control command. When a control command is received by the reception unit, the drive unit switches the tap of the tap changer by driving the main driving shaft by a motor. The detection unit detects the rotational position of the main driving shaft when the tap is switched. The derivation unit derives the deviation amount of the stop position of the tap based on the stop position of the tap associated with the rotation position detected by the detection unit and the target stop position of the tap.

The figure which shows the structural example of the electric operation apparatus for a tap changer of 1st Embodiment. The figure which shows the component composition example of the motor 20 of 1st Embodiment. The figure for demonstrating an example of the content of the stop position information 142 of 1st Embodiment. The figure for demonstrating the process of the derivation part 123 in 1st Embodiment. The flowchart which shows an example of the flow of the process executed by the electric operation apparatus 1 for a tap changer of 1st Embodiment. The figure which shows the structural example of the electric operation apparatus 1A for a tap changer of 2nd Embodiment. The flowchart which shows an example of the flow of the process executed by the electric operation apparatus 1A for a tap changer of 2nd Embodiment. The figure which shows the structural example of the electric operation apparatus 1B for a tap changer of 3rd Embodiment. The figure which shows an example of the contents of the deviation history information 144 of a 3rd Embodiment. The flowchart which shows an example of the flow of the process executed by the electric operation apparatus 1B for a tap changer of 3rd Embodiment.

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

(First Embodiment)
FIG. 1 is a diagram showing a configuration example of an electric operation device for a tap changer according to the first embodiment. The electric operation device 1 for a tap changer includes, for example, an upper panel operation unit 10, a motor 20, a detection unit 30, and an operation control unit 100. A combination of the motor 20 and the motor drive control unit 130 is an example of the "drive unit". Further, a combination of the upper panel operation unit 10 and the operation unit 110 is an example of the "output unit".

The upper panel operation unit 10 is an operation unit provided in a device higher than the electric operation device 1 for the tap changer. The upper panel operation unit 10 is provided, for example, at a position (for example, far away) away from the electric operation device 1 for the tap changer. The upper panel operation unit 10 outputs a control command (upper control command) input by the operation of the user (for example, an administrator or the like) to the operation control unit 100. The upper control command includes, for example, tap switching control associated with step-up control and step-down control for the tap changer LTC under load, derivation control of the deviation amount of the tap stop position at the time of tap switching, correction control for the deviation amount, and the like. Is done. Further, the upper panel operation unit 10 may include an output unit (hereinafter, referred to as a first output unit) that outputs information from the operation control unit 100. The first output unit includes, for example, a display unit for displaying an image, a speaker (audio output unit) for outputting audio, and the like. For example, the upper panel operation unit 10 may be a touch panel type display device provided with a contact detection mechanism superimposed on a display device such as an LCD (Liquid Crystal Display) or an organic EL (Electroluminescence) display device.

For example, the motor 20 intermittently rotates or stops, and the shaft portion (for example, the main driving shaft 21) that can be rotated by the rotation is intermittently rotated in a predetermined direction. Switch the position of the tap (connection point along the winding where a constant rotation speed can be selected). The motor 20 rotates the main driving shaft 21 in the opposite direction by, for example, the step-up control and the step-down control. The electric operation device 1 for the tap changer changes the winding ratio of the transformer in which the tap changer LTC under load is installed by intermittently switching the tap position of the tap changer LTC under load by the motor 20. Adjust the voltage of the transformer. Details of the component configuration of the motor 20 of the embodiment will be described later.

The detection unit 30 is mounted, for example, directly below the main driving shaft 21 that is rotated by the drive of the motor 20. The detection unit 30 detects the rotational position of the driving shaft 21 when the tap is switched. For example, the detection unit 30 can use a multi-rotation encoder, but is not limited thereto. The multi-rotation type encoder has a member that rotates n (n> 0) times with respect to the main driving shaft 21, and detects the rotation position of the main driving shaft 21 by detecting the rotation position of the member. Further, the detection unit 30 outputs the detected rotation position information to the operation control unit 100. The rotation position information is, for example, an address of an absolute position (absolute value) including the rotation angle and the number of rotations of the main driving shaft 21 in multiple rotations. The detection unit 30 outputs, for example, rotation position information from the start to the stop of the rotation of the main driving shaft 21. Further, the detection unit 30 may output rotation position information in a state where the rotation of the main driving shaft 21 is stopped.

The operation control unit 100 includes, for example, an operation unit 110, a switching control unit 120, a motor drive control unit 130, and a storage unit 140. 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 are hardware (circuits) such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), GPU (Graphics Processing Unit), etc. It may be realized by the part; including circuitry), or it may be realized by the cooperation of software and hardware. The program may be stored in advance in a storage device (non-transient storage medium) such as an HDD (Hard Disk Drive) or flash memory, or a removable storage medium (non-transient) such as a DVD or CD-ROM. It is stored in a sexual storage medium), and may be installed by attaching the storage medium to a drive device.

The storage unit 140 is realized by the storage device described above. The storage unit 140 stores the program executed by the processor and also stores the stop position information 142 and the like. The stop position information 142 includes, for example, information regarding the stop position of the target tap (hereinafter, referred to as a target stop position) when the command control unit 122 controls to stop the rotation of the motor 20. The target stop position includes, for example, an address of an absolute position (hereinafter, referred to as a target stop address) including the rotation angle and the rotation speed of the driving shaft 21 associated with the stop position of the tap. The details of the stop position information 142 will be described later.

The operation unit 110 outputs the operation content by the user to the switching control unit 120. The operation contents include, for example, an operation button for instructing voltage step-up or step-down by a transformer mounted in advance as an operation unit 110, an operation button for deriving the deviation amount of the tap stop position, and correction for the derived deviation amount. The user manually operates the operation button to perform the operation. By this operation, a control command for controlling step-up / step-down, derivation of deviation amount, and correction of deviation amount is output to the switching control unit 120. Further, the operation unit 110 may include an output unit (hereinafter, referred to as a second output unit) that outputs information from the switching control unit 120. The second output unit includes, for example, a display unit for displaying an image, an audio output unit for outputting audio, and the like. Further, the operation unit 110 may be a touch panel type display device provided with a contact detection mechanism superimposed on a display device such as an LCD or an organic EL display device.

The switching control unit 120 includes, for example, an operation reception unit 121, a command control unit 122, a derivation unit 123, a correction unit 124, and an output control unit 125. The operation reception unit 121 is an example of the “reception unit”.

The operation reception unit 121 receives a control command from the operation unit 110 or the upper panel operation unit 10. The control command includes a command for instructing tap switching by boosting or lowering the load tap changer LTC, a command for deriving a deviation amount of the tap stop position, and a command for making a correction based on the deviation amount.

The command control unit 122 outputs a command signal for rotation control or stop control to the motor 20 to the motor drive control unit 130 based on the control command received by the operation reception unit 121. When the command control unit 122 performs stop control from the state where the main driving shaft 21 of the motor 20 is rotating, the command control unit 122 acquires the current rotation position based on the rotation position information detected by the detection unit 30. However, a stop control command is output at the timing of stopping at the target stop position. Further, a predetermined rotation is required between the time when the stop control command is output and the time when the motor 20 is completely stopped. Therefore, the command control unit 122 outputs a stop control command at the timing when the rotation position detected by the detection unit 30 reaches a position before the target stop position. The front position is a position corrected by the correction unit 124 based on the deviation amount derived by the derivation unit 123 described later.

The derivation unit 123 shifts the stop position after tap switching in the load tap changer LTC based on the rotation position information detected by the detection unit 30 by the rotation control and stop control of the main driving shaft 21 by the command control unit 122. Detect the amount.

For example, the derivation unit 123 is based on the stop position of the tap associated with the rotation position detected by the detection unit 30 (hereinafter referred to as the actual measurement stop position) and the target stop position included in the stop position information 142. , Derived the amount of deviation of the stop position of the tap. The details of the function of the derivation unit 123 will be described later.

The correction unit 124 corrects the timing of stop control by the motor 20 based on the amount of deviation of the stop position of the tap derived by the extraction unit 123. The details of the function of the correction unit 124 will be described later. While the deviation amount is derived by the above-mentioned derivation unit 123 and the correction is performed by the correction unit 124, the switching control unit 120 temporarily disconnects the electric operation device 1 for the tap changer from the tap changer LTC under load. , The target load tap switching device LTC may be controlled to be temporarily disconnected from the operating power system.

The output control unit 125 outputs the state information related to the load tap changer LTC to one or both of the first output unit of the upper panel operation unit 10 and the second output unit of the operation unit 110. The state information includes, for example, the drive state of the tap changer LTC under load based on the rotation position information, the deviation amount of the tap stop position derived by the extraction unit 123, the rotation control amount corrected by the correction unit 124, and the abnormality. Information about the determination result such as presence / absence. For example, when the output control unit 125 receives a control command from either the upper panel operation unit 10 or the operation unit 110, the output control unit 125 outputs the state information to the output unit that has received the control command. Further, the output control unit 125 acquires the state information to both the first output unit and the second output unit when the state information is the information for notifying the abnormality.

Upon receiving the rotation control command from the switching control unit 120, the motor drive control unit 130 rotates the motor 20 in a predetermined direction and executes tap switching by step control or the like. Further, when the motor drive control unit 130 receives a stop control command from the switching control unit 120, the motor drive control unit 130 executes drive control to stop the rotation of the motor 20.

Next, the component configuration of the motor 20 in the first embodiment will be described. FIG. 2 is a diagram showing a component configuration example of the motor 20 of the first embodiment. The motor 20 shown in FIG. 2 is, for example, for a main drive shaft 21, a motor side pulley 22, a main drive shaft side pulley 23, a tension pulley 24, a timing belt 25, a bulk gear 26, a handle shaft 27, and a handle. It is equipped with an interlock 28. In the example of FIG. 2, the detection unit 30 is also shown.

A motor-side pulley 22 is attached to the motor 20 on the rotating shaft of the motor, and is coupled to the main driving shaft-side pulley 23 via a timing belt 25. The main driving shaft 21 is attached to the main driving shaft side pulley 23, and the detection unit 30 is directly attached directly below the main driving shaft 21 without using a reduction mechanism or the like. By attaching the detection unit 30 to the driving shaft 21 as in the configuration of FIG. 2, the rotation position information of the driving shaft 21 can be detected more accurately.

Further, the tension pulley 24 improves the interlocking between the motor 20 and the main driving shaft 21 by applying tension to the timing belt 25. The main driving shaft 21 is connected to the handle shaft 27 by a radial gear 26. A handle interlock 28 is attached to the handle shaft 27. The handle interlock 28 limits the operation so that the electric operation is not performed when the worker manually switches the tap using the handle, for example, at the time of maintenance.

Next, the details of the function of the derivation unit 123 will be described with reference to the drawings. The derivation unit 123 executes rotation control and stop control for deriving the deviation amount output by the command control unit 122, and the deviation of the tap position is based on the rotation position information detected from the detection unit 30 at the time of execution. Derive the quantity. Hereinafter, it is assumed that a multi-rotation encoder is used for the detection unit 30. Further, it is assumed that one address (position information) is assigned to the encoder every time the main driving shaft 21 rotates by 12 degrees. That is, a total of 30 addresses are assigned to one rotation (360 degrees) of the main driving shaft 21.

Here, when the permissible value of the deviation of the tap stop position after tap switching is about ± 0.3 rotations from the target stop position of the main driving shaft 21, the permissible value of the address deviation amount is about ± 9 addresses. Become. Therefore, the derivation unit 123 sets the offset amount of the stop position within a predetermined range based on the above allowable value, and at the position offset from the target stop position based on the set offset amount, after the tap is actually switched. Controls the stop of the tap. Further, the derivation unit 123 is based on the rotation position (hereinafter referred to as the actual measurement stop address) detected by the detection unit 30 by the actual stop control and the target stop address included in the stop position information 142, and the actual measurement stop address. Get the deviation from the target stop address of. Further, the derivation unit 123 acquires the above deviation while gradually changing the offset amount within the predetermined range, and derives the deviation amount from the relationship between the plurality of offset amounts and the deviation.

FIG. 3 is a diagram for explaining an example of the contents of the stop position information 142 of the first embodiment. In the stop position information 142, for example, a target stop address is associated with a tap switching type which is identification information for identifying a tap to be switched. The tap changer type may include information regarding the type of tap position before and after switching among a plurality of tap positions provided in the load tap changer LTC. In the example of FIG. 3, the tap switching type "SW1" indicates tap switching between the tap position T1 and the tap position T2. The target stop address is, for example, the target stop address (“A1” shown in FIG. 3) at the time of boosting (for example, switching from the tap position T1 to the tap position T2) and the target stop address at the time of stepping down (for example, from the tap position T2 to the tap position T1). The target stop address (“B1” shown in FIG. 3) and the target stop address (at the time of switching to) are included. The derivation unit 123 can acquire the tap switching position and the target stop address associated with the step-up or step-down, and derive a more accurate deviation amount based on the acquired target stop address.

FIG. 4 is a diagram for explaining the processing of the derivation unit 123 in the first embodiment. In FIG. 4, as an example, when switching from the tap position T1 to the tap position T2, the offset amount (horizontal axis) of the address from the target stop address (“A1” in the example of FIG. 3) and the target stop of the actually measured stop address. The relationship with the deviation from the address (vertical axis) is shown.

For example, when the permissible value of the address deviation amount is about ± 9 addresses, the derivation unit 123 sets a value (for example, −10) that exceeds the permissible value by 1 as the offset amount. Further, the derivation unit 123 starts rotation control for switching the tap position, and the rotation position detected by the detection unit 30 reaches the address position obtained by subtracting the offset amount “-10” from the target stop address (A1). At that time, the stop control command is output from the command control unit 122. Further, the derivation unit 123 acquires the actually measured stop address detected by the detection unit 30 when the rotation is stopped by the stop control. Then, the derivation unit 123 acquires the deviation from the target stop address (measured stop address-target stop address) with respect to the offset amount “-10”.

For example, when the offset amount is "-10" and the deviation is "-6", the plot point P1 is drawn in FIG. Further, the derivation unit 123 acquires the deviation from the above-mentioned target stop address while adding the offset amount from "-10" by a predetermined amount (for example, "+2"). In the example of FIG. 4, the plot points P2 to P7 are tapped by sequentially changing the offset amount to "-8", "-6", "-4", "-2", "0", and "2", respectively. It is a plot of the deviation when switching between.

Next, the derivation unit 123 derives a predetermined function f1 based on the information regarding the respective plot points P1 to P7. In the example of FIG. 4, the derivation unit 123 derives a linear function f1 by approximating each plot point to a straight line using the least squares method or the like, but the derivation unit 123 is not limited to this and is non-linear. You may derive the function of. The derivation unit 123 derives the deviation amount at which the deviation becomes 0 based on the derived function f1. Specifically, the derivation unit 123 derives the deviation amount from the intersection of the function f1 shown in FIG. 4 and the horizontal axis. In the example of FIG. 4, the offset amount at the intersection of the function f1 and the horizontal axis is "-2.7". Therefore, the derivation unit 123 derives the amount of deviation of the stop position at the time of tap switching as "-2.7".

In addition, it is preferable that the derivation unit 123 acquires a plurality of the above-mentioned plot points in order to derive the above-mentioned predetermined function. Further, the derivation unit 123 may adjust the offset amount so that at least a plurality of deviations span 0 (zero) (positions straddling the horizontal axis in FIG. 4). The plurality of deviations across 0 means having a positive deviation and a negative deviation, such as "2" and "-1". By acquiring the deviation over 0, it is possible to easily derive a function having an intersection with the horizontal axis. Further, the derivation unit 123 may end the acquisition of the deviation at the time when the deviation crosses 0 (the time when the plot point crosses the horizontal axis).

Further, in the above example, the offset amount is added by a predetermined amount (for example, +2) from "-10" to obtain the deviation, but instead of this, the first offset amount is set to "10" and there. The deviation from the target stop address may be acquired while changing by subtracting a predetermined amount from.

Further, instead of deriving the deviation amount from the predetermined function described above, the derivation unit 123 uses a database in which the offset amount and the deviation amount are associated with the offset amount in advance, and the offset amount is measured. The amount of deviation with respect to the set with the deviation may be derived. In this case, the database is acquired, for example, by performing machine learning or the like using a plurality of correct answer data in which a set of a plurality of offset amounts and deviations and a deviation amount are associated with each other. Further, the above database may be stored in the storage unit 140 or may be acquired from another external device.

Next, the details of the function of the correction unit 124 will be described. The correction unit 124 acquires a correction amount based on the deviation amount derived by the derivation unit 123, and corrects the timing at which the stop control for the motor 20 is started based on the acquired correction amount. For example, when the deviation amount derived by the derivation unit 123 is "-2.7", the correction unit 124 acquires "-3" obtained by rounding off "-2.7" as the correction amount. Then, the correction unit 124 corrects the value obtained by subtracting the correction amount “3” from the target stop address “A1” as the address for starting the stop control. This makes it possible to stop the tap at the target stop address or a position close to the target stop address.

The processing of the derivation unit 123 and the correction unit 124 is preferably performed in a predetermined cycle. As a result, when the amount of displacement changes due to deterioration such as wear of parts in the drive unit of the electric operation device 1 for tap changer and the drive unit of tap changer LTC under load, grease breakage of gears, and astringency due to aging. However, the tap can be stopped at the target stop address or a position close to the target stop address.

Further, the processing of the derivation unit 123 and the correction unit 124 may be performed for each rotation direction (address addition direction and address subtraction direction) at the time of step-up and step-down. As a result, even when a different amount of deviation occurs between the time of step-up and the time of step-down, a more accurate amount of deviation can be derived, and as a result, more appropriate correction can be performed.

Further, it is preferable that the processing of the derivation unit 123 and the correction unit 124 is performed for each tap switching position. As a result, even if the degree of deterioration differs depending on the frequency of use of the tap switching position, the deviation amount of the tap stop position can be derived more accurately, and a more appropriate correction is made based on the derived deviation amount. It can be performed.

Further, although the load tap changer LTC is provided with a plurality of tap positions, the tap positions to be switched may be limited depending on the purpose of use or the like. Therefore, the derivation unit 123 does not derive the deviation amount at the switching position of all taps, and the deviation with respect to the tap switching type designated by the upper panel operation unit 10 or the operation unit 110 or the preset tap switching type. Only the quantity may be derived. As a result, even when the number of taps is large, the required amount of deviation of the tap position can be efficiently derived.

Next, the processing of the electric operation device 1 for the tap changer according to the first embodiment will be described. FIG. 5 is a flowchart showing an example of a flow of processing executed by the electric operation device 1 for a tap changer according to the first embodiment. In the process of FIG. 5, mainly an example of receiving a control command for correcting a deviation amount, deriving the deviation amount, and performing correction processing of a target stop address will be described.

In the example of FIG. 5, first, the operation reception unit 121 receives a deviation amount correction command from the upper panel operation unit 10 or the operation unit 110 (step S100). Next, the command control unit 122 outputs a rotation control command for switching taps (step S102). In the process of step S102, the motor drive control unit 130 that has received the rotation control command performs rotation control for the motor 20. Next, the derivation unit 123 causes the command control unit 122 to perform stop control while changing the offset amount with reference to the target stop address included in the stop position information 142 stored in the storage unit 140 (step S104). In the process of step S104, the motor drive control unit 130 that has received the stop control command performs stop control for the motor 20.

Next, the derivation unit 123 acquires the rotation position information at the time of stop (step S106), and acquires the deviation of the measured stop address included in the acquired rotation position information from the target stop address (step S108). Next, the derivation unit 123 determines whether or not the acquisition of the deviation satisfies a predetermined condition (step S110). The predetermined condition may be, for example, that a plurality of deviations spanning 0 have been acquired, or that a predetermined number or more of deviations have been acquired.

When it is determined that the acquisition of the deviation does not satisfy the predetermined condition, the process returns to the process of step S104, the offset amount is changed to an offset amount different from the offset amount already executed, and the process described later is performed.

Further, in the process of step S110, when it is determined that the acquisition of the deviation satisfies the predetermined condition, the derivation unit 123 acquires a predetermined function based on the relationship between the offset amount and the deviation (step S112). Next, the derivation unit 123 derives the deviation amount based on the acquired predetermined function (step S114).

Next, the correction unit 124 corrects the timing for starting the stop control for stopping the rotation of the motor 20 based on the derived deviation amount (step S116). Next, the switching control unit 120 determines whether or not to end the process (step S118). For example, when the above-mentioned stop position control is performed for each of a plurality of taps provided in the load tap changer LTC, the process is not completed until the derivation and correction of the deviation amount with respect to the target tap are completed. Further, it may be determined that the processing is not completed when both the step-up and the step-down are not completed, or when both the addition direction and the subtraction direction of the offset amount are not completed. If it is determined that the process is not completed, the process returns to the process of step S102. When it is determined that the processing is completed, the output control unit 125 outputs the deviation amount and the correction amount to the output unit (one or both of the first output unit and the second output unit) (step S120). As a result, the processing of this flowchart ends.

In addition to the above-mentioned derivation and correction of the deviation amount, the electric operation device 1 for the tap changer of the first embodiment receives a command for switching the tap and controls the switching of the tap.

As described above, according to the first embodiment, in the electric operation device 1 for the tap switcher, when the command is received by the operation reception unit 121 and the operation reception unit 121, the main driving shaft 21 is received by the motor 20. A drive unit (motor drive control unit 130, motor 20) that switches the tap of the load tap switcher LTC by driving the A tap stop position is provided by providing a lead-out unit 123 that derives a deviation amount of the tap stop position based on the rotation position of the main driving shaft 21 designated by the command and the rotation position detected by the detection unit 30. The amount of deviation can be obtained more accurately.

Further, according to the first embodiment, the measured stop address is acquired while changing the offset amount with respect to the target stop address, and the amount of deviation quantitatively based on the deviation of the acquired measured stop address from the target stop address. By deriving, it is possible to suppress the occurrence of deviation and estimate the tap stop position more accurately. This enables accurate power adjustment as a target, and can supply stable power to consumers.

Further, according to the first embodiment, the deviation amount can be derived and adjusted by remote control from the upper panel operation unit 10 or the like. Therefore, the number of periodic inspections can be reduced and the work cost can be reduced. Further, according to the first embodiment, it is possible to grasp and correct the deviation amount without stopping the power generation. Further, the process relating to the derivation and correction of the deviation amount in the first embodiment can be executed not only after being installed in the field but also at the time of shipment. As a result, the work cost at the time of shipment can be reduced.

(Second embodiment)
Next, a second embodiment of the electric operation device for the tap changer will be described. In the following description, among the configurations of the electric operation device 1 for the tap changer in the first embodiment, the configurations having the same function are designated by the same reference numerals as those in the first embodiment, and specific matters relating to common matters are given. The explanation is omitted.

The second embodiment is different from the electric operation device 1 for a tap changer of the first embodiment in that the switching control unit 120 is provided with an abnormality determination unit. Therefore, in the following, the function of the abnormality determination unit will be mainly described. FIG. 6 is a diagram showing a configuration example of the electric operation device 1A for a tap changer according to the second embodiment. The electric operation device 1A for a tap changer includes, for example, an upper panel operation unit 10, a motor 20, a detection unit 30, and an operation control unit 100A. The operation control unit 100A includes, for example, an operation unit 110, a switching control unit 120A, a motor drive control unit 130, and a storage unit 140. The switching control unit 120A includes, for example, an operation reception unit 121, a command control unit 122, a derivation unit 123, a correction unit 124, an output control unit 125, and an abnormality determination unit 126.

The abnormality determination unit 126 determines whether or not there is an abnormality in the load tap changer LTC or the electric operation device 1A for the tap changer based on the deviation with respect to the offset amount in the above-mentioned derivation unit 123. For example, when the permissible value of the deviation of the stop position is about ± 0.3 rotations of the driving shaft 21, the permissible value of the amount of deviation of the address is about ± 9 addresses. Under this condition, if the deviation of the target address with respect to the offset amount greatly exceeds the above allowable value, it is determined to be abnormal.

Further, the abnormality determination unit 126 acquires the initial deviation amount (shipping deviation amount) acquired before shipping the load tap changer LTC from the factory to the site and after installing the load tap changer LTC at the site. It may be determined whether or not there is an abnormality based on the result of comparison with the amount of misalignment after installation. In this case, if the error of the compared deviation amount is less than the threshold value, the abnormality determination unit 126 estimates that the quality at the factory is secured at the site, and determines that the deviation amount at the site is normal. If the deviation amount error is equal to or greater than the threshold value, the abnormality determination unit 126 determines that the abnormality is abnormal and outputs information for recommending inspection and maintenance to the output unit (first output unit or second output unit). ..

Further, the abnormality determination unit 126 may detect another abnormality state based on the command status from the command control unit 122 and the rotation position information detected from the detection unit 30 by the electric operation device 1 for the tap changer. .. Other abnormal conditions are, for example, traffic jams or runaway conditions. The traffic jam state is, for example, a state in which the motor 20 does not rotate within a predetermined time after outputting a rotation control command, or a state in which the time from the operation of the motor 20 to the switching of taps exceeds a predetermined time. .. The runaway state is, for example, a state in which tap switching by the tap changer LTC at load is completed and the motor 20 continues to be driven even though a stop control command is output to the motor 20.

Next, the processing of the electric operation device 1A for the tap changer according to the second embodiment will be described. FIG. 7 is a flowchart showing an example of the flow of processing executed by the electric operation device 1A for a tap changer according to the second embodiment. In FIG. 7, it is assumed that the deviation amount at the time of shipment has already been derived, and the deviation amount derivation process and correction process after installation at the site will be described.

In the example of FIG. 7, first, the operation reception unit 121 receives an adjustment command for the deviation amount from the upper panel operation unit 10 or the operation unit 110 (step S200). Next, the derivation unit 123 performs the same processing as the processing other than steps S100, S116, and S120 among the steps S100 to S120 executed by the electric operation device 1 for the tap changer in the first embodiment described above. , The amount of deviation (the amount of deviation after installation) is derived (step S202). Next, the abnormality determination unit 126 acquires the amount of deviation at the time of shipment (step S204). Next, the abnormality determination unit 126 calculates an error between the shipping deviation amount and the post-installation deviation amount (step S206), and determines whether or not the calculated error is equal to or greater than the threshold value (step S208). If it is determined that the error is equal to or greater than the threshold value, the abnormality determination unit 126 determines that there is an abnormality (step S210). Next, the output control unit 125 outputs information for which inspection is recommended to the output unit (for example, the first output unit and the second output unit) (step S212).

If it is determined in the process of step S208 that the error is not equal to or greater than the threshold value, the abnormality determination unit 126 determines that there is no abnormality (step S214), and corrects the target stop address based on the derived deviation amount. (Step S216). Next, the output control unit 125 outputs the deviation amount and the correction amount to the output unit (for example, the first output unit or the second output unit) (step S218). As a result, the processing of this flowchart ends.

As described above, according to the electric operating device 1A for the tap switching device of the second embodiment, the same effect as that of the electric operating device 1 for the tap switching device of the first embodiment is obtained, and for example, it is installed at the time of shipment and at the site. By comparing the amount of deviation after the operation, it is possible to more accurately determine whether or not there is an abnormality in the electric operation device 1A for the tap switcher or the tap switcher LTC under load.

(Third embodiment)
Next, a third embodiment of the electric operation device for the tap changer will be described. In the following description, among the configurations of the electric operation device 1A for the tap changer in the second embodiment, the configurations having the same function are designated by the same reference numerals as those in the second embodiment, and specific matters relating to common matters are given. The explanation is omitted.

In the third embodiment, as compared with the electric operation device 1A for the tap changer of the second embodiment, the switching control unit 120A is provided with the prediction unit and the storage unit 140 stores the deviation history information. It's different. Therefore, in the following, the functions of the prediction unit and the deviation history information will be mainly described. FIG. 8 is a diagram showing a configuration example of the electric operation device 1B for a tap changer according to the third embodiment. The electric operation device 1B for a tap changer includes, for example, an upper panel operation unit 10, a motor 20, a detection unit 30, and an operation control unit 100B. The operation control unit 100B includes, for example, an operation unit 110, a switching control unit 120B, a motor drive control unit 130, and a storage unit 140B. The switching control unit 120B includes, for example, an operation reception unit 121, a command control unit 122, a derivation unit 123, a correction unit 124, an output control unit 125, an abnormality determination unit 126, and a prediction unit (discrimination unit) 127. To prepare for.

First, in the third embodiment, the derivation unit 123 adds the result of the deviation derived described above to the deviation history information 144 of the storage unit 140B. FIG. 9 is a diagram showing an example of the contents of the deviation history information 144 of the third embodiment. In the deviation history information 144, for example, a past deviation (specifically, a value obtained by subtracting the target stop address from the actually measured stop address) is associated with the tap switching type. For past deviations, for example, deviations for several times derived in the past are registered together with the derivation date. The deviation to be registered may be an average value of deviations obtained by changing the offset amount, or may be a value having the maximum absolute value. In the example of FIG. 9, the past deviation for each tap at the time of boosting is registered, but in addition to this, the past deviation for each tap at the time of stepping down may be registered.

Next, the prediction unit 127 discriminates the tendency of the past deviation corresponding to the tap changer type from the deviation history information 144, and predicts the time when the abnormality occurs in the tap changer LTC under load from the discriminated tendency. In the example of FIG. 9, in the switching of the tap switching type "SW1" (switching from tap T1 to tap T2), the prediction unit 127 has a deviation of "-6" two times before and a deviation of "-8" last time. Therefore, it is determined that the deviation tends to increase. In addition, the prediction unit 127 sets the amount of change in deviation that occurs during 6 months (the period from 2018/08/01 to 2019/02/01) as "-2" from the past deviation derivation time and deviation. Predict.

Here, when the threshold value for determining that there is an abnormality is set to "-10", the prediction unit 127 sets the deviation to "-10" 6 months after the date when the previous deviation was derived based on the above-mentioned change amount. , Predict that it will be above the threshold. Therefore, the prediction unit 127 predicts that an abnormality will occur 6 months after the date when the tap switching type “SW1” derives the deviation last time. The prediction unit 127 also makes the above-mentioned predictions for other tap changer types.

When an abnormality is predicted to occur, the prediction unit 127 causes one or both of the operation unit 110 and the upper panel operation unit 10 to output warning information regarding the time when the abnormality is predicted to occur and the tap position of the target. As a result, the user or the like can set the inspection date at a more appropriate timing by acquiring the time when the abnormality occurs and the tap type in advance. In addition, since the user or the like can acquire information on the tap position where an abnormality is predicted to occur, the inspection work can be efficiently performed.

The prediction unit 127 may output warning information when it is predicted that an abnormality will occur within a predetermined period (for example, within 3 months) from the current date and time. This makes it easier for the user to check the warning information by warning the administrator only of the information that needs to be inspected soon, compared to the case of notifying the warning information about all the prediction results. can.

Further, the prediction unit 127 may acquire the amount of change for each period from the deviation in the past than the previous time, and may determine whether or not the tap changer LTC under load has deteriorated over time based on the acquired amount of change. .. In this case, the prediction unit 127 determines that the deterioration is due to aging, for example, when the amount of change is less than the threshold value (for example, when the amount of change is gradually increasing). Further, the prediction unit 127 determines that some abnormality has occurred when the amount of change is equal to or greater than the threshold value (for example, when the amount of change suddenly increases). Then, the prediction unit 127 outputs the above-mentioned determination result as state information to the upper panel operation unit 10 or the operation unit 110. As a result, more detailed information can be notified to the user, and the inspection work can be performed at a more appropriate timing.

Next, the processing of the electric operation device 1B for the tap changer according to the third embodiment will be described. FIG. 10 is a flowchart showing an example of the flow of processing executed by the electric operation device 1B for a tap changer according to the third embodiment. In the example of FIG. 10, it is assumed that the deviation history information 144 is already stored in the storage unit 140.

In the example of FIG. 10, first, the prediction unit 127 acquires the deviation history information 144 stored in the storage unit 140B (step S300), and calculates the amount of change in the deviation based on the acquired deviation history information 144 (step S300). Step S302). Next, the prediction unit 127 determines whether or not the acquired change amount is less than the threshold value (step S304). When it is determined that the amount of change is less than the threshold value, the prediction unit 127 determines that the change in deviation is a change due to aged deterioration (no abnormality) (step S306). Next, the output control unit 125 causes the output unit (first output unit or second output unit) to output the state information including the determination result (step S308).

Further, when it is determined in step S304 that the amount of change is equal to or greater than the threshold value, the prediction unit 127 determines that the change in deviation is a sudden change (abnormality) (step S310). Next, the output control unit 125 causes the output unit (first output unit or second output unit) to output status information including the determination result and information for which inspection (or maintenance) is recommended (step S312). As a result, the processing of this flowchart ends.

In the above example, the prediction based on the amount of change in deviation is performed, but instead (or in addition), the prediction based on the rate of change in deviation may be performed. Further, the prediction unit 127 has no abnormality (secular variation) or has an abnormality based on, for example, the deviation amount derived by the derivation unit 123 or the change amount of the correction amount corrected by the correction unit 124 (aging). You may predict whether it is a sudden change). Further, the processing in the third embodiment described above may be performed every time the deviation amount is derived, or may be performed at a predetermined cycle or at the timing when the control command is received.

As described above, according to the electric operation device 1B for the tap changer of the third embodiment, the same effect as that of the electric operation devices 1 and 1A for the tap changer of the first and second embodiments is obtained, and the deviation due to aging is obtained. It is possible to more appropriately determine the presence or absence of an abnormality according to the amount of change in. As a result, it is possible to have a worker or the like perform an inspection at a more appropriate timing.

Each of the first to third embodiments described above may be a combination of some or all of the other embodiments. Further, a part or all of each configuration of the electric operation device for the tap changer shown in each embodiment may be provided on the tap changer side.

Although some 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 various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope of the invention described in the claims and the equivalent scope thereof, as are included in the scope and gist of the invention.

Claims (9)

The reception section that accepts control commands and
When a control command is received by the reception unit, a drive unit that switches the tap of the tap changer by driving the main driving shaft by a motor, and a drive unit.
A detection unit that detects the rotational position of the driving shaft when the tap is switched, and
A derivation unit for deriving a deviation amount of the stop position of the tap based on the stop position of the tap associated with the rotation position detected by the detection unit and the target stop position of the tap is provided.
The derivation unit performs stop control by offsetting a predetermined offset amount from the target stop position, thereby acquiring and acquiring the stop position of the tap associated with the rotation position detected by the detection unit. The deviation of the stopped position from the target stop position is acquired, and the deviation is obtained.
Further, the derivation unit obtains a plurality of the deviations by changing the offset amount, and derives the deviation amount based on the acquired plurality of the offset amounts and the deviations.
Electric operation device for tap changer. A correction unit for correcting the timing at which the rotation of the motor is stopped by the drive unit based on the amount of deviation of the stop position of the tap derived by the lead unit is further provided.
The electric operating device for a tap changer according to claim 1. (delete) (delete) The derivation unit determines whether or not there is an abnormality in the tap changer based on the amount of deviation of the stop position of the tap.
The electric operating device for a tap changer according to claim 1 or 2. Based on the past deviation amount or deviation derived by the derivation unit, the tendency of the deviation of the stop position of the tap is discriminated, and the prediction of the time when the abnormality occurs in the tap switcher is predicted based on the discriminated result. With more parts,
The electric operating device for a tap changer according to any one of claims 1, 2, and 5. The derivation unit derives the deviation amount for each of a plurality of tap positions included in the tap changer.
The electric operating device for a tap changer according to any one of claims 1, 2, 5, and 6. The derivation unit derives the deviation amount for each tap switching between step-up and step-down.
The electric operating device for a tap changer according to any one of claims 1, 2, 5, 6, and 7. The electric operation device for the tap changer
The reception department accepts control commands and receives them.
The tap of the tap changer is switched by driving the main driving shaft by the motor driven by the drive unit according to the received control command.
The detection unit detects the rotation position of the main driving shaft when the tap is switched, and then
The amount of deviation of the stop position of the tap is derived based on the stopped position of the tap associated with the detected rotation position and the target stop position of the tap.
The derivation of the deviation amount is
By performing stop control by offsetting a predetermined offset amount from the target stop position, the stop position of the tap associated with the rotation position detected by the detection unit is acquired.
The deviation of the acquired stop position from the target stop position is acquired, and the deviation is acquired.
By changing the offset amount, a plurality of the deviations are acquired, and
The deviation amount is derived based on the obtained plurality of the offset amounts and the deviations.
Tap changer method.

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