JP2023071405A - Electrically-driven handling device of on-load tap changer - Google Patents

Abstract

To provide an electrically-driven handling device of an on-load tap changer with excellent workability.SOLUTION: An electrically-driven handling device of an on-load tap changer contains: a mechanism part; an outer door; an inner door; a substrate door; a control substrate; and a housing box. The mechanism part makes rotate a driving shaft of the on-load tap changer. The outer door blocks an open surface of a housing. The inner door is provided to an inner side of the outer door, and provides an open part in one part. The substrate door is attached to the inner door to open and close the open part. The control substrate contains an integrated circuit, and controls a rotational operation of the driving shaft. The housing box is provided to a back surface side of the open part, and houses the control substrate.SELECTED DRAWING: Figure 3

Description

Embodiments of the present invention relate to a motorized operating device for an on-load tap changer.

In the electric operating device of the on-load tap changer, it is necessary to check the soundness during maintenance and inspection of the control board that drives and controls the motor. Since the control board of the electric control device is frequently removed from the main body and re-mounted in the field, it is required to be easily removable without removing other mechanical parts.

As a conventional electric operating device, for example, there is a device that includes a mechanism section and a control section, and a panel is attached to the control section. In this electric operating device, when working on the control board, it is necessary to detach the panel attached to the control unit. Although the panel is separated from the mechanism, care must be taken when attaching or detaching the panel so that it does not interfere with other components, resulting in poor workability.

JP 2016-157758 A

The problem to be solved by the present invention is to provide an electric operating device for an on-load tap changer that is excellent in workability.

An electric operating device for an on-load tap changer according to an embodiment has a mechanism section, an outer door, an inner door, a substrate door, a control substrate, and a storage box. The mechanism rotates the drive shaft of the on-load tap changer. The outer door closes the open face of the housing. The inner door is provided inside the outer door and has an opening formed in a part thereof. A substrate door is attached to the inner door and opens and closes the opening. A control board includes an integrated circuit and controls the rotational movement of the drive shaft. The storage box is provided on the back side of the opening and stores the control board.

1 is a perspective view of an electric operating device 1 according to an embodiment; FIG. 2 is a perspective view of the electric operating device 1 of the embodiment with the outer door 12 opened. FIG. FIG. 2 is a perspective view of the electric operating device 1 of the embodiment with the substrate door 15 opened. 2 is a perspective view of the electric operating device 1 of the embodiment with the inner door 14 opened. FIG. FIG. 3 is a perspective view of the state in which the inner door 14 of the electric operating device 1 of the embodiment is opened, as seen from slightly below. 2 is a diagram showing a signal/current system inside a control board 19 and between other components in the electric operating device 1 of the embodiment; FIG. 4 is an enlarged perspective view of the periphery of the opening 14A with the circuit board door 15 opened in the electric operation device 1 of the embodiment; FIG. FIG. 3 is a perspective view of the storage box 18 in the electric operating device 1 of the embodiment as seen from the rear side. FIG. 3 is a perspective view of the storage box 18 in the electric operating device 1 of the embodiment with the bottom plate removed. FIG. 2 is a cross-sectional view of a storage box 18 in the electric operating device 1 of the embodiment; FIG. 2 is an exploded perspective view of the inside of a storage box 18 in the electric operating device 1 of the embodiment;

An 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 regulates voltage by changing the turns ratio (transformation ratio) of a transformer under operating conditions. The electric operating device of the on-load tap changer performs an operation for switching the taps provided on the on-load tap changer. Hereinafter, the electric operating device of the on-load tap changer will be simply referred to as the electric operating device and the description will be continued.

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

The shape of the outer door 12 when viewed from the front is a substantially rectangular shape with the open surface 11A of the housing 11 slightly enlarged. 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 is rotatable around the rotation axis of the outer door hinge 51 . The outer door 12 opens and closes the open surface 11A of the housing 11 by rotating around the rotation axis.

The main drive shaft 13 is provided on the upper surface of the housing 11 . The main drive shaft 13 rotates, for example, around a vertical axis. A driving shaft of an electric on-load tap changer (not shown) is connected to the main driving shaft 13 . When the main driving shaft 13 rotates, the drive shaft of the electric on-load tap changer rotates, and the taps of the electric on-load tap changer are switched. A ventilation port 11B is provided in 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 substantially at the center in the height direction, and a viewing window 12B is provided on the right side of the handle 12A. For example, the outer door 12 is opened by a worker twisting and pulling the handle 12A. Two transparent members are attached to the viewing window 12B. A worker can visually recognize a part of the interior of the housing 11 from the outside through the viewing window 12B.

FIG. 2 is a perspective view of the electric operating device 1 of the embodiment with the outer door 12 opened. The electric operation device 1 further includes an inner door 14 , a board door 15 , a control board operating section 16 and an operation switch section 17 . The inner door 14 is provided at a position close to the outer door 12 in the housing 11 . The shape of the inner door 14 when viewed from the front is slightly smaller than the outer door 12 and has a substantially rectangular shape that is substantially 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 substantially parallel to the rotation axis of the outer door hinge 51 . The inner door 14 rotates around the rotation axis of the inner door hinge 52 to open or close the open surface 11A of the housing 11 . The outer door 12 and the inner door 14 with the open surface 11A of the housing 11 closed are arranged substantially parallel to each other. An open surface 11A of the housing 11 is doubly closed by an outer door 12 and an inner door 14 .

An opening 14A is formed in a portion of the inner door 14, for example, at a lower position of the inner door 14. As shown in FIG. Further, a through hole 14B is formed above the opening 14A in the inner door 14. As shown in FIG. The shape of the opening 14A viewed from the front is substantially rectangular. The opening 14A has a width slightly narrower than the width of the outer shape of the inner door 14. As shown in FIG. The height 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 that of the opening 14A, and is slightly taller.

The substrate door 15 is attached to the surface of the inner door 14 on the outer door 12 side. The substrate door 15 is made of metal such as aluminum. The substrate door 15 may be made of metal other than aluminum. is. The shape of the substrate door 15 when viewed from the front is substantially rectangular, 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 arranged substantially parallel to the rotation axes of the outer door hinge 51 and the inner door hinge 52 . The substrate door 15 rotates around the rotation axis of the substrate door hinge 53 to open or close the opening 14A. The substrate door 15 with the opening 14A closed is arranged substantially parallel to the outer door 12 and the inner door 14 .

The board door 15 is provided with a control board operating section 16 . The control board operation unit 16 includes, for example, operation buttons 16A and a display 16B. In the control board operation section 16 , the operation buttons 16A are provided through the board door 15 , and the display 16B is provided on the back side of the board door 15 . A through hole is formed in a portion of the substrate door 15 on the front side of the display 16B. A transparent member may be fitted in the through hole. The display 16B can be visually recognized from the front side of the closed substrate door 15 through this through hole. The control board operation unit 16 is an example of an input/output unit.

Operation parameters, for example, are set by the operator operating the control board operation unit 16 . The display 16B of the control board operation unit 16 displays, for example, 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 may not be provided.

The viewing window 12B in the outer door 12 is arranged at substantially the same height as the display 16B in the control board operating section 16 when the outer door 12 and the board door 15 are closed. Therefore, for example, even when the outer door 12 is closed, the operator can visually recognize the display 16B in the control board operating section 16 through the viewing window 12B.

The operation switch portion 17 is arranged at a height position substantially the same as the through hole 14B in the closed inner door 14 . The operation switch section 17 is a switch that is used when the electric operation device 1 is manually operated. A through hole 14B is formed in the inner door 14, and an operation switch portion 17 is arranged at substantially the same position as the through hole 14B. Therefore, the operation switch portion 17 can be operated from the outside of the inner door 14 while the inner door 14 remains closed.

FIG. 3 is a perspective view of the electric operating device 1 of the embodiment with the board door 15 opened. 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, such as aluminum. The storage box 18 may be made of 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 housed in the housing box 18 . The control board 19 is provided on the back side of the opening 14A of the inner door 14 . By opening the board door 15, the operator can take out the control board 19 from the front side and maintain the control board. The control board 19 controls the rotation of the main drive shaft 13 to rotate the drive shaft of the electric on-load tap changer via the main drive shaft 13 . A part of the operation buttons 16A and the display 16B of the control board operating section 16 are provided inside the storage box 18 together with the control board 19 .

FIG. 4 is a perspective view of the electric operating device 1 of the embodiment with the inner door 14 opened. The storage box 18 has a substantially rectangular parallelepiped outer shape with one open surface facing the inner door 14 side. The open surface of the storage box 18 can be closed by the board door 15 . A sealed structure is formed by closing the open surface of the storage box 18 with the board door 15 . The control board 19 housed in the housing box 18 is housed and sealed in the housing box 18 closed by a sealing structure surrounded from all directions by metal members.

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

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 the control signal output from the control board 19 . The transmission mechanism portion 22 is arranged inside the electric motor 21 and interposed between the electric motor 21 and the main driving shaft 13 . The transmission mechanism portion 22 transmits rotation of the electric motor 21 to the main driving shaft 13 . The transmission mechanism portion 22 transmits the rotation of the electric motor 21 to the main driving shaft 13 , so that the electric motor 21 rotates the main driving shaft 13 .

The encoder 23 is arranged below the transmission mechanism section 22 . The encoder 23 detects the rotation angle of the main driving shaft 13 by detecting the motion of the transmission mechanism 22 . The encoder 23 may directly detect the rotation angle of the main driving shaft 13 . The control relay section 24 is arranged below the encoder 23 . The control relay section 24 controls the operation of the electric motor 21 based on the control signal output from the control board 19 .

The upper board connection terminal portion 25 connects input/output signal lines of the upper board including the control board 19 for controlling the operation of the electric motor 21 and the electric motor 21 . The power supply unit section 26 is arranged on the front side of the host panel connection terminal section 25 and attached to the inner surface of the housing 11 . The power supply unit 26 supplies power to the control board 19 , the electric motor 21 and the encoder 23 .

FIG. 6 is a diagram showing a 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 functional block 19F and a motor control block 19M. The functional block 19F is connected to the control board operation section 16, the operation switch section 17, the host board connection terminal section 25, the motor control block 19M, and the encoder 23 by the first signal/current connection 31. FIG.

Further, 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 to supply power.

Next, the details of the structure around the housing box 18 that houses the control board 19 will be described. FIG. 7 is an enlarged perspective view of the periphery of the opening 14A where the substrate door 15 is opened 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 in the control board operating section 16 attached to the board door 15 are connected to the control board 19 by a board operating cable 41 having flexibility.

Since the substrate operating cable 41 has flexibility, it is difficult for the substrate operating cable 41 to expand and contract and break due to the opening and closing of the substrate door 15 . The connectors to which the board operation cable 41 is connected on each of the control board operating section 16 and the control board 19 are positioned so that the distance between the connector of the control board operating section 16 and the connector of the control board 19 becomes closer when the board door 15 is opened. placed in Therefore, the board operation cable 41 connects the control board 19 and the control board operation unit 16 at the shortest distance when the board door 15 is opened. The board operation cable 41 is an example of a wiring member.

The control board 19 includes a board 19A, a plurality of surface-mounted elements 19B mounted on the front side (front side) of the board 19A, and a plurality of back-mounted elements 19C (see FIG. 8) mounted on the back side (back side) of the board 19A. , provided. A body connection cable 42 is connected to the substrate 19A. A side surface of the housing box 18 is formed with a cable through hole 18A. The main body connection cable 42 passes through the cable insertion 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. As shown in FIG.

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

The electric operating device 1 of the embodiment includes a heat dissipation structure for dissipating heat accumulated in the elements mounted on the control board 19 housed in the housing box 18 . The heat dissipation structure will be described below. FIG. 9 is a perspective view of the storage box 18 in the electric operating device 1 of the embodiment with the bottom plate removed. The back mounted elements 19C mounted on the back surface of the control board 19 include an integrated circuit element 19D. The integrated circuit element 19D generates a relatively large amount of heat when the electric operation device 1 is operated.

A heat transfer member 50 is attached to the rear surface (opposite to the substrate 19A) side of the integrated circuit element 19D by being attached. The heat transfer member 50 is attached to cover part of the back surface of the integrated circuit element 19D. The heat transfer member 50 covers a wide range of the back surface of the integrated circuit element 19D. The heat transfer member 50 includes, for example, a heat-dissipating gel sheet or heat-dissipating rubber.

FIG. 10 is a cross-sectional view of the storage box 18. As shown in FIG. Inside the storage box 18 , the heat transfer member 50 is arranged between the integrated circuit element 19</b>D attached to the control board 19 and the bottom plate 18</b>L of the storage box 18 . The integrated circuit element 19D is in contact with the integrated circuit element 19D and also in contact with the bottom plate 18L of the housing box 18. As shown in FIG. The heat transfer member 50 thermally contacts the integrated circuit element 19D and the container box 18 by contacting the integrated circuit element 19D and the bottom plate 18L of the container box 18, respectively. The heat generated by the integrated circuit element 19D is transferred (released) to the housing box 18, thereby cooling the integrated circuit element 19D.

FIG. 11 is an exploded perspective view of the inside of the storage box 18 in the electric operating device 1 of the embodiment. Flanges 18B extending in four directions are provided outside the opening of the storage box 18 . The flange portion 18B is substantially perpendicular to the four sides of the storage box 18, respectively. A screw hole 18H is provided in the flange portion 18B, and the storage box 18 is attached to the inner door 14 by screwing the inner door 14 through the screw hole 18H.

The control board 19 is surrounded on four sides by the side walls 18S of the storage box 18, and the bottom is closed by the bottom plate 18L. Moreover, the surface is closed by the substrate door 15 . Thus, the control board 19 is housed inside a closed metal box.

Next, the operation and action of the electric operating device 1 of the embodiment will be described. In the electric operating device including the electric operating device 1 of the embodiment, field inspection of the control board 19 is likely to be performed relatively frequently. It is desirable to have a structure that does not affect other components as much as possible during field inspections.

In recent years, in this type of electric operation mechanism, it is generally necessary to provide an inner door 14 inside the outer door 12 from the viewpoint of preventing contamination by foreign matter and considering safety in the event of malfunction. For this reason, for example, if the field inspection work of the control board 19 is performed with the inner door 14 opened, the transmission mechanism 22 of the mechanism 20, the encoder 23, the control relay 24, the host panel connection terminal 25, and the power supply The unit section 26 is in a state of being close to the worker. For this reason, care must be taken to prevent the worker's clothing, arms, and tools from being affected by adhering matter, and to prevent the worker from coming into contact with the components of the mechanical section 20 . As a result, the workability is significantly impaired, and the risk of inspection work arises.

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

In addition, in the electric operating device 1 of the embodiment, various electronic components including an integrated circuit are mounted on the control board 19 . For this reason, it may be affected by static electricity, electromagnetic noise, etc. from the outside, and it is desired to eliminate these influences. Furthermore, it is necessary to take care not to be affected by abrasion dust from members disposed above such as the transmission mechanism 22 .

In this regard, in the electric operating device 1 of the embodiment, the control board 19 is housed in the housing box 18 containing a metal plate, and the opening of the housing box 18 is closed by the board door 15 made of metal, so that all directions are sealed. blocked. Therefore, static electricity, electromagnetic noise, and the like from the outside can be blocked, and intrusion of dust such as abrasion powder can be suppressed.

Further, the electric operating device is generally provided with a control board operation section 16 including operation buttons 16A for setting operation parameters, a display 16B for displaying tap positions and switching, various settings, error information, and the like. The arrangement position of the control board operation unit 16 is required to be as close as possible to the control board 19 in order to eliminate the influence of noise.

In this respect, in the electric operating device 1 of the embodiment, the connectors of the control board operating section 16 and the control board 19 are arranged at positions where the distance between them becomes closer when the board door 15 is opened. Therefore, the board operation cable 41 connects the control board 19 and the control board operation unit 16 at the shortest distance when the board door 15 is opened. Therefore, the influence of noise can be reduced. In addition, since the board operation cable 41 can be shortened, the board operation cable 41 can be less likely to overhang the display 16B.

Furthermore, by providing the operation buttons 16A and the display 16B of the control board operating section 16 on the surface of the board door 15, the operability and visibility of the control board operating section 16 are improved. At this time, since the control board 19 is arranged behind the inner door 14 in the vicinity of the control board operating section 16, the operability and visibility of the control board operating section 16 can be maintained in a favorable state.

Further, 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 the switching direction based on the position information detected by the encoder 23, and detects malfunction of the device. related. Therefore, depending on the frequency of the switching operation of the on-load tap changer, it is necessary to deal with heat generation in the integrated circuit element 19D.

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

According to at least one embodiment described above, a mechanism for rotating the drive shaft of the on-load tap changer, an outer door for closing the open surface of the housing, and a part of the an inner door having an opening formed in the inner door; a board door attached to the inner door for opening and closing the opening; a control board including an integrated circuit for controlling the rotational movement of the drive shaft; It is possible to provide an electric operating device for an on-load tap changer with excellent workability by having a housing box provided on the back side and housing the control board.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1... Electric operating device 11... Case, 11A... Open surface, 12... Outer door, 14... Inner door, 14A... Opening, 15... Board door, 18... Storage box, 18L... Bottom plate, 19... Control board, 19A... Substrate 19D... Integrated circuit element 20... Mechanism part 50... Heat transfer member

Claims (5)

a mechanism for rotating the drive shaft of the on-load tap changer;
an outer door that closes the open face of the housing;
an inner door provided inside the outer door and partially formed with an opening;
a substrate door attached to the inner door and opening and closing the opening;
a control board that includes an integrated circuit and controls the rotational movement of the drive shaft;
a storage box provided on the back side of the opening and storing the control board;
Electric operating device for on-load tap changers. The control board is closed by a sealing structure surrounded from all directions by a metal member,
An electric operating device for an on-load tap changer according to claim 1. an input/output unit provided inside the housing box of the substrate door;
a wiring member that connects the control board and the input/output unit at the shortest distance when the board door is opened;
3. The electric operating device for an on-load tap changer according to claim 1 or 2. further comprising a heat transfer member that thermally contacts the integrated circuit element mounted on the control board and the bottom plate of the storage box;
An electric operating device for an on-load tap changer according to any one of claims 1 to 3. The heat transfer member includes at least one of a heat-dissipating gel sheet and a heat-dissipating rubber,
5. An electric operating device for an on-load tap changer according to claim 4.

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