Tap position display device, under load tap changer, and voltage regulator

Abstract

The objective is to provide a tap position display device or the like that can be made smaller or lighter. [Solution] The tap position display device includes a display unit that displays the selected tap by moving to a position corresponding to each of a plurality of taps selectable by a tap selector, a motor that moves the display unit, and a drive control unit that acquires the position of a switching motor that switches the tap selected by the tap selector and controls the drive of the motor based on the acquired position.

Description

Technical Field

[0006] , ,

[0007] , ,

[0001] The present disclosure relates to a tap position display device, a tap changer under load, and a voltage regulator.

Background Art

[0002] The tap changer under load provided in a voltage regulator includes a tap position display device that displays a tap position. Patent Document 1 discloses a tap position display device in which a multi-stage gear is coupled to a drive unit of the tap changer under load, and the tap position display is switched in conjunction with the switching of the tap position.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the conventional tap position display device using a multi-stage gear has a problem that it is difficult to miniaturize or lightweight.

[0005] An object of the present disclosure is to provide a tap position display device or the like that can be miniaturized or lightweight.

Means for Solving the Problems

[0006] In one aspect of the present disclosure, the tap position display device includes a display that displays a selected tap by moving to a position corresponding to each of a plurality of taps selectable by a tap selector, a motor that moves the display, and a drive control unit that acquires the position of a switching motor that switches the tap selected by the tap selector and controls the driving of the motor based on the acquired position. <​​In one embodiment of the present disclosure, the on-load tap switching device is configured to include a tap position display device which includes a display that displays the selected tap by moving to a position corresponding to each of a plurality of taps selectable by a tap selector, a motor that moves the display, and a drive control unit that acquires the position of a switching motor that switches the tap selected by the tap selector and controls the drive of the motor based on the acquired position, a tap selector which selects a tap to connect to a transformer having a plurality of taps, and a switching motor that switches the tap selected by the tap selector.

[0008] In one embodiment of the present disclosure, the voltage regulator includes a transformer having a plurality of taps, a tap selector that selectively connects to the taps of the transformer, a display that moves to a position corresponding to each of the plurality of taps selectable by the tap selector to display the selected tap, a motor that moves the display, and a drive control unit that acquires the position of a switching motor that switches the tap selected by the tap selector and controls the drive of the motor based on the acquired position, wherein the tap position regulator is configured to display the tap selected by the tap selector on the display. [Effects of the Invention]

[0009] According to this disclosure, it is possible to provide a tap position display device or the like that can be made smaller or lighter. [Brief explanation of the drawing]

[0010] [Figure 1] This is an explanatory diagram showing the configuration of a voltage regulator. [Figure 2] This is a circuit diagram of part of a transformer and a tap changer. [Figure 3] This is an explanatory diagram showing the display switching process of the display unit in Embodiment 1. [Figure 4] This is an explanatory diagram showing the correspondence between the position of the switching motor and the position of the motor in Embodiment 1. [Figure 5] This flowchart shows an example of the processing procedure of the drive control unit. [Figure 6] This is an explanatory diagram showing the display switching process of the display unit in Embodiment 2. [Figure 7] This is an explanatory diagram showing the correspondence between the position of the switching motor and the position of the motor in Embodiment 2. [Modes for carrying out the invention]

[0011] A tap position display device, an under-load tap switching device, and a voltage regulator according to embodiments of this disclosure will be described below with reference to the drawings. This disclosure is not limited to these examples, but is intended to include all modifications within the meaning and scope of the claims, as indicated by the claims. At least some of the embodiments described below may be combined in any way.

[0012] (Embodiment 1) Figure 1 is an explanatory diagram showing the configuration of the voltage regulator 100. The voltage regulator 100 comprises a transformer 1 and an on-load tap changer 101. The on-load tap changer 101 comprises a tap changer 2, a changer drive unit 3, a drive control unit 4, a display unit 5, and a display unit drive unit 6.

[0013] Figure 2 is a circuit diagram of a part of transformer 1 and tap changer 2. Transformer 1 and tap changer 2 are connected in a way that allows power to flow. Transformer 1 has a primary winding and a secondary winding. The primary winding has a main winding W and a plurality of taps tn, which are terminals from which windings are drawn out from the main winding W. Taps tn have even-numbered taps t2, t4, t6, t8, t10 and odd-numbered taps t1, t3, t5, t7, t9, t11. In this embodiment, taps tn are assumed to be drawn out from the primary winding, but taps tn may also be drawn out from the secondary winding. In this embodiment, an example with 11 taps tn is shown, but the number of taps tn is not limited to 11.

[0014] The tap changer 2 includes a tap selector 21, a switching disconnector 22, and a neutral line N. The tap selector 21 has an odd tap selector T1 and an even tap selector T2. The odd tap selector T1 is electrically connected to any one of the odd-side taps t1, t3, t5, t7, t9, t11, thereby changing the number of turns of the primary winding and adjusting the voltage transformation ratio of the transformer 1. The even tap selector T2 is electrically connected to any one of the even-side taps t2, t4, t6, t8, t10, thereby changing the number of turns of the primary winding and adjusting the voltage transformation ratio of the transformer 1.

[0015] The switching disconnector 22 includes a first fixed contact 22a, a second fixed contact 22b, a movable contact 22c, a current-limiting resistor R, and a vacuum valve V. The vacuum valve V includes a first vacuum valve Va and a second vacuum valve Vb. The first fixed contact 22a is electrically connected to the odd tap selector T1. The second fixed contact 22b is electrically connected to the even tap selector T2. The movable contact 22c is connected to the neutral line N.

[0016] The movable contact 22c is configured to be movable between the first fixed contact 22a and the second fixed contact 22b. When the movable contact 22c contacts any one of the fixed contacts, the main winding W and the neutral line N are electrically connected through the tap tn connected to the contacted fixed contact.

[0017] The first fixed contact 22a is electrically connected to one end of the current-limiting resistor R. The other end of the current-limiting resistor R is electrically connected to one end of the first vacuum valve Va. The other end of the first vacuum valve Va is electrically connected to the neutral line N. The movable contact 22c is electrically connected to one end of the second vacuum valve Vb. The other end of the second vacuum valve Vb is electrically connected to the neutral line N.

[0018] The vacuum valve V functioning as a vacuum circuit breaker has an insulating cylinder with a vacuum inside, a fixed electrode fixed inside the insulating cylinder, and a movable electrode arranged inside the insulating cylinder and separable from and connectable to the fixed electrode. The vacuum valve V becomes non-conductive when the movable electrode moves away from the fixed electrode (opens the valve) and becomes conductive when the movable electrode connects to the fixed electrode (closes the valve).

[0019] The operation of switching the tap tn will be described. The initial state in the following is that the odd tap selector T1 is connected to the tap t1, the even tap selector T2 is connected to the tap t2, and the movable contact 22c is connected to the first fixed contact 22a, and the first vacuum valve Va is open and the second vacuum valve Vb is closed. Therefore, in the initial state, the current flows from the main winding W through the tap t1, the odd tap selector T1, the first fixed contact 22a, the movable contact 22c, and the second vacuum valve Vb to the neutral line N.

[0020] When switching the tap tn from the initial state to t2, first, the first vacuum valve Va is closed. At this time, due to the existence of the current-limiting resistor R, the current does not flow through the first vacuum valve Va or only flows very little. Next, the second vacuum valve Vb is opened. At this time, the current flows from the tap t1 through the odd tap selector T1, through the current-limiting resistor R and the first vacuum valve Va, and to the neutral line N.

[0021] When the movable contact 22c separates from the first fixed contact 22a and connects to the second fixed contact 22b and the second vacuum valve Vb is closed, the current starts to flow from the main winding W through the tap t2, the even tap selector T2, the second fixed contact 22b, the movable contact 22c and the second vacuum valve Vb to the neutral line N. That is, it means that the tap tn has been switched from t1 to t2. At this time, due to the existence of the current-limiting resistor R, a bridging state exists between the taps and a circulating current flows. By opening Va, the circulating current is cut off and the switching is completed.

[0022] Next, the case of switching from the tap t2 to the tap t3 will be described. While the current is flowing through the tap t2, the odd tap selector T1 is connected to the tap t3. After closing Va and then opening the second vacuum valve Vb and moving the movable contact 22c from the second fixed contact 22b to the first fixed contact 22a, the current flows from the main winding W through the tap t3, the odd tap selector T1, the current-limiting resistor R and the first vacuum valve Va to the neutral line N. At this point, it means that the tap tn has been switched from t2 to t3.

[0023] After this, closing the second vacuum valve Vb will return the system to its initial state, except that the tap tn is connected to t3. Therefore, to switch tap tn from t3 to t4, connect the even tap selector T2 to tap t4, and then follow the same procedure as when switching tap tn from t1 to t2.

[0024] In other words, tap switching in this embodiment is achieved by closing the first vacuum valve Va and allowing current to flow through the current-limiting resistor R and the first vacuum valve Va, while changing the connections of the odd tap selector T1, the even tap selector T2, and the movable contact 22c. By following the above procedure, tap switching can be performed without interrupting the current.

[0025] In this embodiment, the changeover switch 22 is shown to have one current-limiting resistor R and two vacuum valves V, but the number of current-limiting resistors R and vacuum valves V is not limited to the number shown. Instead of vacuum valves V, a mechanism belonging to the oil circuit breaker, air circuit breaker, or gas circuit breaker may be used.

[0026] The switch drive unit 3 comprises a communication unit 31, a switching motor 32, and a detector 33. The communication unit 31 is a communication module capable of wired communication using signal lines or communication lines, or wireless communication. The switch drive unit 3 and the drive control unit 4 are connected in a way that allows communication, for example, by signal lines, communication lines, or wireless communication.

[0027] The switching motor 32 is a component that has a power supply function, such as a stepping motor or a servo motor. The switching motor 32 is connected to the tap changer 2 via its output shaft and supplies power to the tap changer 2, thereby driving the tap changing of the tap changer 2.

[0028] The connection between the changeover motor 32 and the tap changer 2 is not limited to a direct connection between the output shaft of the changeover motor 32 and the tap changer 2. The connection between the changeover motor 32 and the tap changer 2 can be any connection that allows the changeover motor 32 to supply power to drive the tap changing of the tap changer 2, such as a connection via a cam mechanism or a connection via a gear mechanism.

[0029] The detector 33 is a sensor that detects the position of the switching motor 32. The position of the switching motor 32 is, for example, the rotation angle or rotation speed of the output shaft of the switching motor 32. The detector 33 may be configured as, for example, a rotary encoder or a Hall sensor. The detector 33 may be built into the switching motor 32.

[0030] The drive control unit 4 is configured as, for example, a PLC (Programmable Logic Controller), FPGA (Field Programmable Gate Array), or ASIC (application specific integrated circuit), and includes a control unit 41, a storage unit 42, and a communication unit 43.

[0031] The control unit 41 includes a processing element such as a CPU (Central Processing Unit) or MPU (Micro Processing Unit). The storage unit 42 includes a storage element such as RAM (Random Access Memory) or ROM (Read Only Memory). The communication unit 43 is a communication module capable of wired communication using signal lines or communication lines, or wireless communication.

[0032] Figure 3 is an explanatory diagram showing the display switching of the display unit 5 in this embodiment. The display unit 5 comprises a display panel 51 and a windowed member 52, and displays the tap position, which is the position of the tap tn that is electrically connected and energized by the odd-numbered tap selector T1 or the even-numbered tap selector T2. The display panel 51 is a member on which tap position numbers t1, t2, t3, etc. are written. The windowed member 52 is a member that can show a specific tap position number from among the tap position numbers written on the display panel 51.

[0033] The display panel 51 is, for example, a rotatable disc-shaped member on which tap position numbers are inscribed in a circle, as shown in Figure 3. The windowed member 52 is, for example, a member having a window 521 for displaying tap position numbers, as shown in Figure 3, and is positioned to overlap the disc-shaped display panel 51. The windowed member 52 may also be rotatable.

[0034] Figure 3 illustrates the case in Embodiment 1 when the tap position switches from t3 to t4. When the tap position is t3, "t3" is displayed in the window 521 of the windowed member 52. When the tap tn switches to t4, the display panel 51 rotates and "t4" is displayed in the window 521.

[0035] The display drive unit 6 includes a communication unit 61 and a motor 62. The communication unit 61 is a communication module capable of wired communication using signal lines or communication lines, or wireless communication. The communication unit 61 can communicate with the communication unit 43.

[0036] The motor 62 is a component that has a rotational power supply function, such as a stepping motor or a servo motor. The motor 62 is connected to the display panel 51 via its output shaft. The motor 62 supplies power to the display panel 51 to drive the display switching of the display unit 5. If the windowed member 52 is rotatable, the motor 62 may be connected to the windowed member 52.

[0037] The connection between the display panel 51 and the motor 62 is not limited to a direct connection between the display panel 51 and the output shaft of the motor 62. The connection between the display panel 51 and the motor 62 can be any connection that can supply power to the display panel 51 for the motor 62 to drive the display switching of the display unit 5, such as a connection via a cam mechanism or a connection via a gear mechanism.

[0038] Next, the switching of the tap position display in this embodiment will be described. If the voltage applied to the transmission side of transformer 1 changes due to excessive use of electricity by the consumer, etc., the voltage transmitted by transformer 1 may change if the transformation ratio of transformer 1 is maintained. In such cases, it is necessary to change the transformation ratio of transformer 1.

[0039] The drive control unit 4 obtains the output voltage from the transformer 1. If it determines that the obtained output voltage deviates from a certain range, the drive control unit 4 obtains the current position of the switching motor 32 from the detector 33 via the communication unit 31 and the communication unit 43. The position of the switching motor 32 is, for example, the rotation angle or rotation speed of the output shaft of the switching motor 32. Subsequently, the drive control unit 4 outputs a control signal from the communication unit 43 to the communication unit 31, which includes a drive command to change the transformation ratio by switching the tap position so that the transformer 1 can maintain a predetermined output voltage.

[0040] Upon receiving a control signal from the drive control unit 4, the changeover drive unit 3 controls the opening and closing of the vacuum valve V and the operation of the movable contact 22c, that is, it controls the changeover switch 22.

[0041] When the changeover drive unit 3 receives a control signal from the drive control unit 4, the rotation angle of the output shaft of the changeover motor 32 changes. The control of the changeover switch 22 and the change in the position of the changeover motor 32 are linked, and the tap selector 21 is driven so that the odd tap selector T1 or the even tap selector T2 is connected to the tap tn that has a predetermined voltage transformation ratio, and the tap position is switched.

[0042] The detector 33 detects the position of the switching motor 32 after the change. The position of the switching motor 32 detected by the detector 33 is transmitted from the switch drive unit 3 to the drive control unit 4.

[0043] Figure 4 is an explanatory diagram showing the correspondence between the positions of the switching motor 32 and the motor 62 in this embodiment. In the following, the case where the positions of the switching motor 32 and the motor 62 are the rotation angles of their respective output shafts will be given as an example. Note that the positions of the switching motor 32 and the motor 62 are not limited to the rotation angles of their respective output shafts, but may also be, for example, the rotational speed of their respective output shafts.

[0044] The memory unit 42 stores conversion information 42a that records the correspondence between the rotation angle θ, which is the position of the switching motor 32, and the rotation angle φ, which is the position of the motor 62. The conversion information 42a may be a correspondence table as shown in Figure 4, or it may be a function in which the rotation angle θ is the explanatory variable and the rotation angle φ is the dependent variable.

[0045] Figure 5 is a flowchart showing an example of the processing procedure of the drive control unit 4. The drive control unit 4 acquires the position of the switching motor 32 detected by the detector 33 (step S1). The acquired position is compared with the conversion information 42a stored in the storage unit 42 by the control unit 41 (step S2). The drive control unit 4 identifies the position of the motor 62 corresponding to the position of the switching motor 32 from the conversion information 42a (step S3). The drive control unit 4 sends a drive command for the motor 62 to the display drive unit 6 so that the motor 62 is in the identified position (step S4).

[0046] The following describes the case shown in Figure 3, where the tap position display switches from t3 to t4. The rotation angle of the motor 62 changes according to the drive command transmitted from the drive control unit 4. As a result, the display panel 51 is driven by the motor 62 and rotates approximately 30 degrees clockwise. The rotation of the display panel 51 switches the display of the tap position visible through the window 521 of the windowed member 52, and the new tap position t4 is displayed.

[0047] In this embodiment, the example illustrates a case where the display of the tap position is switched by the motor 62 driving and rotating the display panel 51. However, the display of the tap position may also be switched by connecting the motor 62 to the windowed member 52 and making the windowed member 52 rotatable by the motor 62. In other words, the display unit 5 can be configured such that the motor 62 is connected to a part of the display unit 5, and the connected part moves relative to other parts when driven by the motor 62.

[0048] In this embodiment, the display unit 5 is exemplified as including a display board 51 which is a rotatable disc-shaped member, and a windowed member 52 which has a window 521 for displaying the tap position number. However, the display unit 5 is not limited to a configuration including a display board 51 and a windowed member 52. For example, the display unit 5 may include a plate-shaped member on which the tap position number is written and a rotating indicator attached to its surface, and the indicator may be driven by a motor 62. The plate-shaped member may be made rotatable by driving the motor 62, and the indicator may be fixed. The configuration of the display unit 5 is not limited to the above configuration.

[0049] The drive control unit 4, upon receiving information regarding the position of the motor 62 or the display state of the indicator 5, may recognize whether the tap position to which the tap changer 2 is connected matches or does not match the position of the motor 62 or the display state of the indicator 5. If a mismatch is recognized, the drive control unit 4 may correct the mismatch by transmitting drive information to the changer drive unit 3 or the indicator drive unit 6 to correct the mismatch.

[0050] The tap position display device illustrated in this embodiment can switch the tap position display without using a multi-stage gear. Therefore, the on-load tap changing device 101 equipped with the tap position display device illustrated in this embodiment can be made smaller or lighter than conventional on-load tap changing devices.

[0051] (Embodiment 2) The configuration of the voltage regulator 100 in Embodiment 2 will now be described. The voltage regulator 100 in this embodiment comprises a transformer 1 and an on-load tap changer 101. The on-load tap changer 101 in this embodiment comprises a tap changer 2, a changer drive unit 3, a drive control unit 4, a display unit 5, and a display unit drive unit 6.

[0052] The transformer 1, tap changer 2, changer drive unit 3, and drive control unit 4 have the same configuration as in Embodiment 1. Therefore, the following description will focus on the display unit 5 and the display unit drive unit 6, which have configurations different from those in Embodiment 1.

[0053] Figure 6 is an explanatory diagram showing the display switching of the display unit 5 in this embodiment. The display unit 5 comprises a display panel 51 and a windowed member 52, and displays the position of the tap tn to which the odd tap selector T1 or even tap selector T2 is electrically connected.

[0054] The display panel 51 is a component on which tap position numbers t1, t2, t3, etc. are inscribed in a row. The windowed component 52 is a component that can indicate a specific tap position number from among the tap position numbers inscribed on the display panel 51.

[0055] The display panel 51 is, for example, a linearly movable rod-shaped or plate-shaped member on which tap position numbers are inscribed in a row, as shown in Figure 6. The windowed member 52 is, for example, a member having a window 521 for displaying tap position numbers, as shown in Figure 6, and is positioned to overlap the display panel 51. The windowed member 52 may also be linearly movable.

[0056] Figure 6 illustrates the case when the tap position switches from t3 to t4. When the tap position is t3, "t3" is displayed in the window 521 of the windowed member 52. When the tap tn switches to t4, the display panel 51 moves straight upward in Figure 6, and "t4" is displayed in the window 521 of the windowed member 52.

[0057] The display drive unit 6 comprises a communication unit 61 and a motor 62. The communication unit 61 is the same as the communication unit 61 in Embodiment 1. The motor 62 in this embodiment is a component that has a linear motion unit 621 and a linear power supply function, such as a linear stepping motor or linear servo motor, or a stepping motor or servo motor equipped with a slider-crank mechanism, etc.

[0058] The motor 62 is connected to the display panel 51 via the linear motion unit 621. The motor 62 supplies power to the display unit 5 to drive the display switching of the display unit 5. The connection between the display unit 5 and the motor 62 is not limited to a direct connection between the display unit 5 and the linear motion unit 621. The connection between the display unit 5 and the motor 62 can be any connection that allows the motor 62 to supply power to the display unit 5 to drive the display switching of the display unit 5, such as a connection via a cam mechanism or a connection via a gear mechanism. If the windowed member 52 is capable of linear motion, the linear motion unit 621 may be connected to the windowed member 52.

[0059] Next, the switching of the tap position display in this embodiment will be described. The process from the change in voltage applied to the transformer 1 to the drive control unit 4 obtaining the position of the switching motor 32 detected by the detector 33, and the processing procedure by the drive control unit 4, are the same as in Embodiment 1, so the explanation will be omitted.

[0060] Figure 7 is an explanatory diagram showing the correspondence between the position of the switching motor 32 and the position of the motor 62 in this embodiment. In the following, we will illustrate the case where the position of the switching motor 32 is the rotation angle θ of the output shaft, and the position of the motor 62 is the linear motion position L of the linear motion section 621 of the motor 62. Note that the position of the switching motor 32 is not limited to the rotation angle θ of the output shaft, but may also be, for example, the rotation speed of the output shaft. The position of the motor 62 is not limited to the linear motion position L of the linear motion section 621, but may also be, for example, the rotation angle or rotation speed of the output shaft of the motor 62 before it is converted into linear power.

[0061] The memory unit 42 stores conversion information 42a, which records the correspondence between the rotation angle θ, which is the position of the switching motor 32, and the linear motion position L of the linear motion unit 621, which is the position of the motor 62. The conversion information 42a may be a correspondence table as shown in Figure 7, or it may be a function with the rotation angle θ as the explanatory variable and the linear motion position L as the objective variable.

[0062] The following describes the case shown in Figure 6, where the tap position display switches from t3 to t4. The linear motion unit 621 of the motor 62 moves linearly according to the drive command transmitted from the drive control unit 4. As the position of the linear motion unit 621 changes, the display board 51 connected to the linear motion unit 621 is driven and moves linearly upward in Figure 6. The linear motion of the display board 51 switches the display of the tap position shown in the window 521 of the windowed member 52, and the new tap position t4 is displayed.

[0063] In this embodiment, the linear motion unit 621 of the motor 62 is connected to the display panel 51, and the display of the tap position is switched by moving the display panel 51 linearly. However, the display of the tap position may also be switched by connecting the linear motion unit 621 to the windowed member 52 and making the windowed member 52 linearly movable.

[0064] In this embodiment, the display unit 5 is exemplified as including a display board 51 which is a rod-shaped or plate-shaped member that can move linearly, and a windowed member 52 which has a window 521 that displays the tap position number. However, the display unit 5 is not limited to a configuration that includes a display board 51 and a windowed member 52. For example, the display unit 5 may be configured to include a rod-shaped or plate-shaped member on which the tap position number is written, and a linearly moving indicator attached to its surface, and the indicator may be driven by a motor 62. The rod-shaped or plate-shaped member may be made linearly movable by driving the motor 62, and the indicator may be fixed. The configuration of the display unit 5 is not limited to the above configuration.

[0065] The tap position display devices described in Embodiments 1 and 2 above do not require a tap changer or a multi-stage gear connected to a tap changer drive unit, and therefore can be made smaller or lighter.

[0066] The on-load tap changing device equipped with the tap position display device described in Embodiments 1 and 2 above is a smaller or lighter on-load tap changing device than conventional devices.

[0067] The voltage regulator equipped with the tap position display device shown in Embodiments 1 and 2 above, and the on-load tap switching device, is a voltage regulator that is smaller or lighter than conventional devices. [Explanation of Symbols]

[0068] 1: Transformer, 2: Tap changer, 3: Changer drive unit, 4: Drive control unit, 5: Indicator, 6: Indicator drive unit, 21: Tap selector, 62: Motor, 100: Voltage regulator, 101: On-load tap changer

Claims

1. A display that shows the selected tap by moving to the position corresponding to each of the multiple taps selectable by the tap selector, A motor for moving the display unit, The drive control unit acquires the position of the switching motor that switches the tap selected by the tap selector, and controls the drive of the motor based on the acquired position. A tap position display device equipped with the following features.

2. The drive control unit, The acquired position of the switching motor is converted to the position of the motor, The motor's drive is controlled based on the converted position of the motor. The tap position display device according to claim 1.

3. The motor is a stepping motor or a servo motor. The tap position display device according to claim 1.

4. The tap position display device according to claim 1, A tap selector for selecting a tap to connect to a transformer having multiple taps, A switching motor that switches the tap selected by the tap selector, A tap changer that operates under load.

5. A tap selector for selecting a tap to connect to a transformer having multiple taps, A switching motor that switches the tap selected by the tap selector, A detector for detecting the position of the switching motor, A display that shows the selected tap by moving to a position corresponding to each of the multiple taps that can be selected by the tap selector, A motor including a stepping motor or servo motor for moving the display unit, A drive control unit that controls the drive of the switching motor and the drive of the motor. Equipped with, The drive control unit, The detector acquires the position of the switching motor and the output voltage of the transformer. Based on the acquired position of the switching motor and the output voltage of the transformer, the drive of the switching motor is controlled so that the tap selector is connected to the tap where the output voltage of the transformer is maintained. It stores conversion information for converting the position of the switching motor to the position of the motor, Based on the conversion information, the position of the switching motor detected by the detector is converted to the position of the motor. The motor's drive is controlled based on the converted position of the motor. On-load tap changer.

6. A transformer with multiple taps, A tap selector that selectively connects to the taps of the transformer, The tap position display device according to claim 1 and Equipped with, The tap position display device displays the tap selected by the tap selector using the display. Voltage regulator.

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