JP7662491B2 - Electric operation device for on-load tap changer - Google Patents

Description

An embodiment of the present invention relates to an electrically operated operating device for an on-load tap changer.

In the electric operating device for on-load tap changers, the control board that drives and controls the motor must be checked for soundness during maintenance and inspection. The control board for the electric control device is frequently removed from the main unit in the field and reinstalled, so it must be easy to attach and detach without having to remove other mechanical parts.

A conventional electric operating device, for example, includes a mechanism and a control unit, with a panel attached to the control unit. In this type of electric operating device, when performing work on the control board, it is necessary to attach and detach the panel attached to the control unit. Although the panel is separate from the mechanism, care must be taken when attaching and detaching the panel to avoid interference with other components, which makes it difficult to work with.

JP 2016-157758 A

The problem that this invention aims to solve is to provide an easy-to-operate electrically operated device for an on-load tap changer.

The electric operating device for an on-load tap changer of the embodiment has a mechanism, an outer door, an inner door, a circuit board door, a control board, and a housing box. The mechanism rotates the drive shaft of the on-load tap changer. The outer door closes the open side of the housing. The inner door is provided inside the outer door and has an opening formed in a portion of it. The circuit board door is attached to the inner door and opens and closes the opening. The control board includes an integrated circuit and controls the rotational operation of the drive shaft. The housing box is provided on the back side of the opening and houses the control board.

1 is a perspective view of an electric operating device according to an embodiment; FIG. 2 is a perspective view of the electric operating device 1 according to the embodiment with an outer door 12 open. FIG. 2 is a perspective view of the electric operating device 1 according to the embodiment with a board door 15 open. FIG. 2 is a perspective view of the electric operating device 1 according to the embodiment with the inner door 14 open. FIG. 2 is a perspective view of the electric operating device 1 of the embodiment with the inner door 14 open, as viewed from slightly below. 2 is a diagram showing a signal/current system inside the control board 19 and between other components in the electric operating device 1 according to the embodiment. FIG. 1 is an enlarged perspective view of the periphery of an opening 14A when a board door 15 is open in the electric operating device 1 of the embodiment. FIG. FIG. 2 is a perspective view of the storage box 18 in the electric operating device 1 according to the embodiment, as viewed from the rear side. 1 is a perspective view of the electric operating device 1 according to the embodiment with the bottom plate of the storage box 18 removed. FIG. FIG. 4 is a cross-sectional view of the storage box 18 in the electric operating device 1 according to the embodiment. FIG. 2 is an exploded perspective view showing the inside of a storage box 18 in the electric operating device 1 according to the embodiment.

The electric operating device for an on-load tap changer according to an embodiment will be described below with reference to the drawings. An on-load tap changer is a device that adjusts voltage by changing the turns ratio (transformation ratio) of a transformer during operation. The electric operating device for an on-load tap changer performs operations to switch the taps provided in the on-load tap changer. In the following description, the electric operating device for an on-load tap changer will be referred to simply as the electric operating device.

Figure 1 is a perspective view of an electric operating device 1 according to an embodiment. As shown in Figure 1, the electric operating device 1 includes, for example, a housing 11, an outer door 12, and a drive shaft 13. The housing 11 has a shape in which one side of the exterior shape of a substantially rectangular parallelepiped is open to form an open surface 11A. The open surface 11A of the housing 11 can be closed by the outer door 12. In Figure 1, the open surface 11A is closed by the outer door 12. In the following description, the surface of the housing 11 on which the open surface 11A is formed is referred to as the front. In addition, when viewed from the front, the left and right sides are referred to as side surfaces, the back is referred to as the back surface, the upper side is referred to as the top surface, and the lower side is referred to as the bottom surface.

When viewed from the front, the outer door 12 has a generally rectangular shape that is slightly larger than the open surface 11A of the housing 11. One side of the housing 11 and one side of the outer door 12 are connected via an outer door hinge 51 (see FIG. 2). The outer door 12 can rotate around the rotation axis of the outer door hinge 51. By rotating around the rotation axis, the outer door 12 opens and closes the open surface 11A of the housing 11.

The drive shaft 13 is provided on the top surface of the housing 11. The drive shaft 13 rotates, for example, around a vertical axis. A drive shaft of an electric on-load tap changer (not shown) is connected to the drive shaft 13. When the drive shaft 13 rotates, the drive shaft of the electric on-load tap changer rotates, and the tap of the electric on-load tap changer is changed. A ventilation hole 11B is provided at the upper side of the housing 11 to ventilate the inside and outside of the housing 11.

A handle 12A is provided on the left side of the outer door 12, approximately in the center in the height direction, and a sight window 12B is provided to the right of the handle 12A. For example, the outer door 12 is opened by an operator twisting and pulling the handle 12A. Two transparent members are attached to the sight window 12B. An operator can view a portion of the interior of the housing 11 from the outside through the sight window 12B.

Figure 2 is a perspective view of the electric operating device 1 of the embodiment with the outer door 12 open. The electric operating device 1 further includes an inner door 14, a board door 15, a control board operation unit 16, and an operation switch unit 17. The inner door 14 is provided in a position close to the outer door 12 in the housing 11. When viewed from the front, the inner door 14 is slightly smaller than the outer door 12 and has a generally rectangular shape that is roughly the same shape as the open surface 11A of the housing 11.

One side of the housing 11 and one side of the inner door 14 are connected via an inner door hinge 52. The rotation axis of the inner door hinge 52 is arranged approximately parallel to the rotation axis of the outer door hinge 51. The inner door 14 opens and closes the open surface 11A of the housing 11 by rotating around the rotation axis of the inner door hinge 52. When the open surface 11A of the housing 11 is closed, the outer door 12 and the inner door 14 are arranged approximately parallel to each other. The open surface 11A of the housing 11 is doubly closed by the outer door 12 and the inner door 14.

An opening 14A is formed in a part of the inner door 14, for example, in a lower position of the inner door 14. Furthermore, a through hole 14B is formed above the opening 14A in the inner door 14. The shape of the opening 14A when viewed from the front is approximately rectangular. The opening 14A has a width slightly narrower than the width of the outer shape of the inner door 14. It has a height that is about 1/3 of the height of the outer shape of the inner door 14. The through hole 14B has a width slightly narrower than the opening 14A and is only slightly high.

The board door 15 is attached to the surface of the inner door 14 facing the outer door 12. The board door 15 is made of metal, for example, aluminum. The board door 15 may be made of metal other than aluminum . The board door 15 has a substantially rectangular shape when viewed from the front, which is substantially the same shape as the opening 14A. One side of the board door 15 and one side of the opening 14A are connected via a board door hinge 53. The rotation axis of the board door hinge 53 is disposed substantially parallel to the rotation axes of the outer door hinge 51 and the inner door hinge 52. The board door 15 opens and closes the opening 14A by rotating around the rotation axis of the board door hinge 53. When the opening 14A is closed, the board door 15 is disposed substantially parallel to the outer door 12 and the inner door 14.

The board door 15 is provided with a control board operation unit 16. The control board operation unit 16 includes, for example, an operation button 16A and a display 16B. Of the control board operation unit 16, the operation button 16A is provided penetrating the board door 15, and the display 16B is provided on the rear side of the board door 15. A through hole is formed in the part of the board door 15 facing the display 16B. A transparent member may be fitted into the through hole. The display 16B is visible from the front side of the closed board door 15 through this through hole. The control board operation unit 16 is an example of an input/output unit.

For example, operating parameters are set by an operator operating the control board operation unit 16. For example, the display 16B of the control board operation unit 16 displays the position and switching direction of the tap to be switched by the electric on-load tap changer, various settings, error information, and the like. The display may be a touch panel on which a GUI (Graphical User Interface) is displayed. If the display is a touch panel, the operation button 16A does not need to be provided.

When the outer door 12 and the board door 15 are closed, the viewing window 12B in the outer door 12 is positioned at approximately the same height as the display 16B in the control board operation unit 16. Therefore, for example, even when the outer door 12 is closed, an operator can view the display 16B in the control board operation unit 16 through the viewing window 12B.

The operation switch unit 17 is disposed at approximately the same height as the through hole 14B in the closed inner door 14. The operation switch unit 17 is a switch used when manually operating the electric operating device 1. A through hole 14B is formed in the inner door 14, and the operation switch unit 17 is disposed at approximately the same position as the through hole 14B. Therefore, the operation switch unit 17 can be operated from outside the inner door 14 while the inner door 14 is closed.

Figure 3 is a perspective view of the electric operating device 1 of the embodiment with the board door 15 open. The electric operating device 1 further includes a storage box 18 and a control board 19. The storage box 18 is attached to the rear side of the board door 15. The storage box 18 is made of metal, for example, aluminum. The storage box 18 may be made of a metal other than aluminum. The storage box 18 is made of the same material as the board door 15. The storage box 18 may be made of a material different from that of the board door 15.

The control board 19 is stored in the storage box 18. The control board 19 is provided on the rear side of the opening 14A of the inner door 14. By opening the board door 15, an operator can remove the control board 19 from the front side and perform maintenance on the control board. The control board 19 controls the rotational movement of the drive shaft 13, and rotates the drive shaft of the electric on-load tap changer via the drive shaft 13. Along with the control board 19, a part of the operation button 16A of the control board operation unit 16 and the display 16B are provided inside the storage box 18.

Figure 4 is a perspective view of the electric operating device 1 of the embodiment with the inner door 14 open. The storage box 18 has a generally rectangular parallelepiped shape with one side open, and the open surface on the front side faces the inner door 14. The open surface of the storage box 18 can be closed by the board door 15. When the open surface of the storage box 18 is closed by the board door 15, a sealed structure is formed. The control board 19 contained in the storage box 18 is contained and sealed inside the storage box 18, which is sealed by a sealed structure surrounded on all sides by metal members.

A mechanism unit 20 is provided on the upper part of the rear side of the surface where the closed inner door 14 is located inside the housing 11. FIG. 5 is an oblique view of the electric operating device 1 of the embodiment with the inner door 14 open, viewed from slightly below. The mechanism unit 20 in the electric operating device 1 rotates the drive shaft of the on-load tap changer. The mechanism unit 20 includes, for example, an electric motor 21, a transmission mechanism unit 22, an encoder 23, a control relay unit 24, a host board connection terminal unit 25, and a power supply unit unit 26.

The electric motor 21 is provided near one side surface inside the housing 11. The electric motor 21 rotates the main drive shaft 13 based on a control signal output from the control board 19. The transmission mechanism 22 is disposed inside the electric motor 21 and is interposed between the electric motor 21 and the main drive shaft 13. The transmission mechanism 22 transmits the rotation of the electric motor 21 to the main drive shaft 13. The transmission mechanism 22 transmits the rotation of the electric motor 21 to the main drive shaft 13, causing the electric motor 21 to rotate the main drive shaft 13.

The encoder 23 is disposed below the transmission mechanism 22. The encoder 23 detects the operation of the transmission mechanism 22, thereby detecting the rotation angle of the drive shaft 13. The encoder 23 may directly detect the rotation angle of the drive shaft 13. The control relay 24 is disposed below the encoder 23. The control relay 24 controls the operation of the electric motor 21 based on a control signal output by the control board 19.

The upper board connection terminal section 25 connects the input/output signal lines of the motor 21 to the upper board, which includes the control board 19 that controls the operation of the motor 21. The power supply unit section 26 is disposed on the front side of the upper board connection terminal section 25 and is attached to the inner surface of the housing 11. The power supply unit section 26 supplies power to the control board 19, the motor 21, and the encoder 23.

Figure 6 is a diagram showing the signal/current system inside the control board 19 and between other components in the electric operating device 1 of the embodiment. The control board 19 is composed of, for example, a function block 19F and a motor control block 19M. The function block 19F is connected to the control board operation section 16, the operation switch section 17, the upper board connection terminal section 25, the motor control block 19M, and the encoder 23 by a first signal/current connection 31.

Furthermore, the motor control block 19M is connected to the control relay section 24 by a second signal/current connection 32, and the control relay section 24 is connected to the electric motor 21 by a third signal/current connection 33. The power supply unit section 26 is connected to the encoder 23, the control relay section 24, the electric motor 21, and the control board 19 by a fourth signal/current connection 34, and is configured to supply power.

Next, the details of the structure around the storage box 18 that houses the control board 19 will be described. Figure 7 is an enlarged oblique view of the periphery of the opening 14A when the board door 15 is open in the electric operating device 1 of the embodiment. The board door 15 is connected to the opening 14A via a board door hinge 53. The operation buttons 16A and the display 16B of the control board operation unit 16 attached to the board door 15 are connected to the control board 19 by a flexible board operation cable 41.

The flexibility of the board operation cable 41 makes it difficult for the board operation cable 41 to expand and contract when the board door 15 is opened and closed, resulting in breakage. The connectors to which the board operation cable 41 is connected on the control board operation unit 16 and the control board 19 are positioned so that the connector of the control board operation unit 16 and the connector of the control board 19 are closest when the board door 15 is open. Therefore, the board operation cable 41 connects the control board 19 and the control board operation unit 16 over the shortest distance when the board door 15 is open. The board operation cable 41 is an example of a wiring member.

The control board 19 comprises a board 19A, a plurality of surface-mounted elements 19B mounted on the front side (surface) of the board 19A, and a plurality of back-mounted elements 19C (see FIG. 8) mounted on the back side (back side). A main body connection cable 42 is connected to the board 19A. A cable passage hole 18A is formed in the side of the storage box 18. The main body connection cable 42 passes through the cable passage hole 18A and is connected to each component of the electric operating device 1, such as the control relay section 24 and the power supply unit section 26.

Figure 8 is an oblique view of the storage box 18 in the electric operating device 1 of the embodiment, seen from the rear side. The control board 19 is surrounded on all four sides by the side walls 18S of the storage box 18. The bottom surface is closed by a bottom plate 18L arranged on the rear side of the storage box 18, and the surface is closed by a board door 15 arranged on the front side of the storage box 18. Thus, the control board 19 is housed inside a metal box with six sides closed by metal plates.

The electric operating device 1 of the embodiment is provided with a heat dissipation structure that dissipates heat that accumulates in elements mounted on the control board 19 housed in the housing box 18. The heat dissipation structure is described below. Figure 9 is a perspective view of the electric operating device 1 of the embodiment with the bottom plate of the housing box 18 removed. The back-mounted element 19C mounted on the back surface of the control board 19 includes an integrated circuit element 19D. The integrated circuit element 19D generates a relatively large amount of heat when the electric operating device 1 is in operation.

A heat transfer member 50 is attached to the back surface (opposite the substrate 19A) of the integrated circuit element 19D by being affixed thereto. The heat transfer member 50 is attached so as to cover a portion of the back surface of the integrated circuit element 19D. The heat transfer member 50 covers a wide area of the back surface of the integrated circuit element 19D. The heat transfer member 50 is composed of, for example, a heat dissipating gel sheet or heat dissipating rubber.

Figure 10 is a cross-sectional view of the storage box 18. Inside the storage box 18, the heat transfer member 50 is disposed between the integrated circuit element 19D attached to the control board 19 and the bottom plate 18L of the storage box 18. The integrated circuit element 19D is in contact with the integrated circuit element 19D and also with the bottom plate 18L of the storage box 18. The heat transfer member 50 contacts both the integrated circuit element 19D and the bottom plate 18L of the storage box 18, thereby bringing the integrated circuit element 19D and the storage box 18 into thermal contact. The heat generated by the integrated circuit element 19D is transferred (dissipated) to the storage box 18, thereby cooling the integrated circuit element 19D.

Figure 11 is an exploded perspective view of the inside of the storage box 18 in the electric operating device 1 of the embodiment. On the outside of the opening of the storage box 18, flange portions 18B are provided extending in four directions. The flange portions 18B are approximately perpendicular to each of the four sides of the storage box 18. Screw holes 18H are provided in the flange portions 18B, and the storage box 18 is attached to the inner door 14 by being screwed to the inner door 14 via the screw holes 18H.

The control board 19 is surrounded on all four sides by the side walls 18S of the storage box 18, and its bottom surface is closed by the bottom plate 18L. The front surface is also closed by the board door 15. Thus, the control board 19 is stored inside the closed metal box.

Next, the operation and function of the electric operating device 1 of the embodiment will be described. In an electric operating device including the electric operating device 1 of the embodiment, it is highly likely that field inspection of the control board 19 will be performed relatively frequently, so it is desirable to have a structure in which the inspection work is easy and which has as little effect as possible on other components due to inspections performed in the field (hereinafter, field inspection).

In recent years, in this type of electric operating mechanism, it is generally necessary to provide an inner door 14 inside the outer door 12 from the viewpoint of preventing the intrusion of foreign matter and safety considerations in the event of malfunction. For this reason, if the inner door 14 is opened to perform a field inspection of the control board 19, the transmission mechanism 22, encoder 23, control relay 24, upper board connection terminal 25, and power supply unit 26 of the mechanism 20 will be in close proximity to the worker. For this reason, care must be taken to prevent the effects of substances adhering to the worker's clothes, arms, and tools, and to prevent the worker from coming into contact with the components of the mechanism 20. As a result, workability is significantly impaired, creating risks during the inspection work.

In this regard, the electric operating device 1 of the embodiment is provided with a board door 15. Therefore, field inspection work can be performed by opening only the board door 15 without opening the inner door 14. This reduces the work risk, and provides an electric operating device with excellent workability.

In addition, in the electric operating device 1 of the embodiment, various electronic components including integrated circuits are mounted on the control board 19. For this reason, it may be affected by external static electricity, electromagnetic noise, etc., and it is desirable to eliminate these effects. Furthermore, care must be taken to prevent the device from being affected by dust from wear particles from components arranged above, such as the transmission mechanism unit 22.

In this regard, in the electric operating device 1 of the embodiment, the control board 19 is housed in a housing box 18 including a metal plate, and the opening of the housing box 18 is closed by a metal board door 15, sealing it in all directions. This makes it possible to block static electricity, electromagnetic noise, etc. from the outside, and also to prevent the intrusion of dust particles from wear powder, etc.

In addition, an electrically operated device is generally provided with a control board operation unit 16 that includes operation buttons 16A for setting operating parameters and a display 16B for displaying tap positions and switches, various settings, error information, etc. The control board operation unit 16 should be located as close as possible to the control board 19 to eliminate the effects of noise.

In this regard, in the electric operating device 1 of the embodiment, the connectors of the control board operation unit 16 and the control board 19 are positioned so that the distance between them is shorter when the board door 15 is open. Therefore, the board operation cable 41 connects the control board 19 and the control board operation unit 16 over the shortest distance when the board door 15 is open. This reduces the effects of noise. Also, because the board operation cable 41 can be shortened, it is less likely that the board operation cable 41 will cross over the display 16B, reducing visibility.

Furthermore, by providing the operation buttons 16A and display 16B of the control board operation unit 16 on the surface of the board door 15, the operability and visibility of the control board operation unit 16 are improved. At this time, the control board 19 is disposed on the back side of the inner door 14 near the control board operation unit 16, so that the operability and visibility of the control board operation unit 16 can be maintained in a good state.

In addition, in the electric operating device 1 of the embodiment, the integrated circuit element 19D mounted on the control board 19 calculates the tap position and switching direction and checks for malfunctions of the device based on the position information detected by the encoder 23. Therefore, depending on the frequency of switching operations of the on-load tap changer, measures must be taken to prevent heat generation in the integrated circuit element 19D.

In this regard, in the electric operating device 1 of the embodiment, a heat transfer member 50 is interposed between the integrated circuit element 19D and the bottom plate 18L of the housing box 18, and the heat generated by the integrated circuit element 19D is transferred to the metal housing box 18. This allows the heat generated by the integrated circuit element 19D to be effectively discharged, facilitating the cooling of the integrated circuit element 19D. As a result, reliability can be ensured when the electric operating device 1 is operated continuously.

According to at least one of the embodiments described above, an electrically operated operating device for an on-load tap changer that is easy to use can be provided by having a mechanism that rotates the drive shaft of the on-load tap changer, an outer door that closes the open side of the housing, an inner door that is provided inside the outer door and has an opening formed in a portion of it, a board door that is attached to the inner door and opens and closes the opening, a control board that includes an integrated circuit and controls the rotational movement of the drive shaft, and a storage box that is provided on the back side of the opening and contains the control board.

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

1...electrically operated device, 11...housing, 11A...opening surface, 12...outer door, 14...inner door, 14A...opening, 15...board door, 18...container box, 18L...bottom plate, 19...control board, 19A...board, 19D...integrated circuit element, 20...mechanism, 50...heat transfer member

Claims (5)

A mechanism for rotating a drive shaft of the on-load tap changer;
an outer door for closing an open surface of the housing;
an inner door provided inside the outer door and having an opening formed in a portion thereof;
a board door attached to the inner door for opening and closing the opening;
A control board including an integrated circuit and controlling the rotational operation of the drive shaft;
A housing box is provided on the rear side of the opening and houses the control board.
Electric operating device for on-load tap changer. the board door and the container are made of metal,
The control board is sealed by a sealed structure surrounded by the metal member on all sides.
2. An on-load tap changer motor operating device according to claim 1. An input/output unit provided on the board door on the inside of the container box;
and a wiring member that connects the control board and the input/output unit at the shortest distance when the board door is open.
3. An electric operating device for an on-load tap changer according to claim 1 or 2. a heat transfer member that thermally contacts an integrated circuit element mounted on the control board with a bottom plate of the housing box,
4. An electric actuator for an on-load tap changer according to claim 1. The heat transfer member includes at least one of a heat dissipating gel sheet or a heat dissipating rubber.
5. An on-load tap changer motor operating device according to claim 4.

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