JP7362914B2 - Energy storage mechanism of on-load tap changer and on-load tap changer - Google Patents

Description

Embodiments of the present invention relate to an energy storage mechanism for an on-load tap changer and an on-load tap changer.

An on-load tap changer is a device that switches taps while a transformer is operating (when under load). Generally, an on-load tap changer includes a tap selector and a switching switch. A tap selector selects the tap to operate on the transformer tap winding. The switching switch switches the circuit to the selected tap. The switching switch's energy storage mechanism performs tap switching instantly. Energy storage mechanisms are required to suppress driving loads.

Patent No. 5971674 Patent No. 5744180

The problem to be solved by the present invention is to provide an energy storage mechanism for an on-load tap changer and an on-load tap changer that can suppress the driving load.

The energy storage mechanism of the on-load tap changer according to the embodiment includes an eccentric arm, a drive arm, a toggle spring mechanism, and a Geneva mechanism. The eccentric arm is rotated by an external force. The drive arm rotates as the first end is pressed by the eccentric arm . The opposite side of the first end across the rotation axis of the drive arm is defined as a second end. The toggle spring mechanism is energized when the operating section is pressed by the second end of the drive arm. The Geneva mechanism drives the switching switch in conjunction with the opening operation of the toggle spring mechanism. The toggle spring mechanism has a spring member and a switching arm. A spring member is hinged to the mounting member at the first joint. The spring member and the switching arm are hinged to each other at the second joint. The switching arm is hinged to the mounting member at the third joint. The operating section is arranged at the second joint. The Geneva mechanism includes a Geneva driver and a Geneva. The Geneva driver is rotated by the opening action of the toggle spring mechanism. The Geneva is driven to rotate by the rotation of the Geneva driver and drives the switching switch. The switching arm has a switching arm pressing portion that presses and rotates the Geneva driver. The switching arm pressing section presses the Geneva driver in a state where the switching operation of the switching switch is completed. The operating portion is separated from the second end of the drive arm by the opening action of the toggle spring mechanism. The second end of the drive arm comes into contact with the operating section again as the eccentric arm continues to rotate. The second end of the drive arm is capable of pressing the operating portion to a position where the switching operation of the switching switch is completed.

FIG. 2 is a perspective view of an on-load tap changer according to an embodiment. FIG. 3 is a perspective view of the on-load tap changer with the cylindrical container removed. FIG. 3 is a perspective view of the drive mechanism from above. FIG. 3 is a perspective view from below of the switching switch. FIG. 3 is a side sectional view of the energy storage mechanism of the embodiment. FIG. 3 is a perspective view from below of the energy storage mechanism. FIG. 3 is a perspective view of the energy storage mechanism from above. FIG. 3 is a perspective view of the switching arm from above. FIG. 3 is a plan view of the energy storage mechanism in a first state. FIG. 7 is a plan view of the energy storage mechanism in the second state. FIG. 7 is a plan view of the energy storage mechanism in the third state. FIG. 7 is a plan view of the energy storage mechanism in a fourth state. FIG. 7 is a plan view of the energy storage mechanism in a fifth state. FIG. 7 is a plan view of the energy storage mechanism in the sixth state.

Hereinafter, the energy storage mechanism and the on-load tap changer of the embodiment will be described with reference to the drawings.
FIG. 1 is a perspective view of an on-load tap changer according to an embodiment. FIG. 2 is a perspective view of the on-load tap changer with the cylindrical container removed. The on-load tap changer 1 is a device that adjusts voltage by changing the turns ratio (transformation ratio) of a transformer in an operating state. The on-load tap changer 1 includes a tap selector 2, a drive mechanism 5, and a switching switch 10.

The tap selector 2 performs a selection operation to select an operating tap in the transformer tap winding. The tap selector 2 advances the non-energized tap to the next tap in advance.
The switching switch 10 performs a switching operation to switch the circuit to the selected tap. The switching switch 10 switches between a selected energized tap and a non-energized tap. The switching switch 10 is arranged inside a cylindrical container 10a and immersed in insulating oil.
The drive mechanism 5 drives the tap selector 2 and the switching switch 10 using a drive force transmitted from an electric operating device (not shown) via a drive shaft 6.

FIG. 3 is a perspective view from above of the drive mechanism. The drive shaft 6 is connected to a transmission shaft 8 via a gear train 7. The transmission shaft 8 passes through the bottom plate 10b of the cylindrical container 10a of the switching switch 10 and is connected to the switching switch 10.

FIG. 4 is a perspective view from below of the switching switch. The switching switch 10 is arranged inside a cylindrical container 10a shown in FIG. The switching switch 10 includes a cutoff mechanism that switches the energization path, and a power storage mechanism 20 that drives the cutoff mechanism. The cutoff mechanism includes a switching unit 12 and a cam unit 15. The switching unit 12 is formed for each phase of three-phase alternating current. The switching unit 12 of each phase is arranged above the main mounting plate 11. The cam unit 15 is arranged at the center of the switching unit 12 of each phase. The cam unit 15 rotates forward and backward by a predetermined angle to switch the switching units 12 of each phase at the same time. The cam unit 15 has a cam unit shaft 14 (see FIG. 5) arranged along the central axis of the cylindrical container 10a.

The energy storage mechanism 20 is arranged between the main mounting plate 11 and the bottom mounting plate 21. The energy storage mechanism 20 uses the driving force transmitted via the transmission shaft 8 shown in FIG. 3 to store energy in the toggle spring mechanism 50m. The energy storage mechanism 20 quickly rotates the cam unit shaft 14 forward and backward by a predetermined angle by the opening operation of the toggle spring mechanism 50m.

The energy storage mechanism 20 will be explained in detail.
FIG. 5 is a side sectional view of the energy storage mechanism of the embodiment taken along line VV in FIG. 4. FIG. 5 shows a state in which the eccentric arm roller 34 is brought close to the switching arm shaft 61.

In this application, the Z direction, X direction, and Y direction of the orthogonal coordinate system are defined as follows. The Z direction is a direction along the central axis of the switching arm shaft 61, which is arranged coaxially with the cam unit shaft 14. For example, the Z direction is the vertical direction, and the +Z direction is the upward direction. The X direction is a direction perpendicular to the Z direction within a plane including the central axis of the switching arm shaft 61 and the central axis of the eccentric arm shaft 31. The +X direction is a direction from the central axis of the cam unit shaft 14 to the central axis of the eccentric arm shaft 31. The Y direction is a direction perpendicular to the Z direction and the X direction. For example, the X direction and the Y direction are horizontal directions. The circumferential direction of the Z direction is defined as the θ direction. The +θ direction is the rotational direction of the right-handed screw that advances in the +Z direction.

FIG. 6 is a perspective view from below of the energy storage mechanism. FIG. 7 is a perspective view from above of the energy storage mechanism. In FIGS. 6 and 7, illustrations of each mounting plate (main mounting plate 11, intermediate mounting plate 25, and bottom mounting plate 21) shown in FIG. 5 are omitted. As shown in FIGS. 6 and 7, the energy storage mechanism 20 includes an eccentric arm 30, a drive arm 40, a toggle spring mechanism 50m, and a Geneva mechanism 70m.

The eccentric arm 30 is approximately egg-shaped when viewed from the Z direction, as shown in FIGS. 6 and 7. The side surface of the eccentric arm 30 is a cam surface 32 that abuts the drive arm 40 . Projections 33 projecting from the cam surface 32 are formed at both ends of the cam surface 32 in the Z direction. The protrusion 33 prevents the drive arm 40 from falling off the cam surface 32.

An eccentric arm shaft 31 is inserted near the first end of the eccentric arm 30 in the longitudinal direction when viewed from the Z direction. The central axis of the eccentric arm shaft 31 is parallel to the Z direction. Eccentric arm 30 is fixed to eccentric arm shaft 31. As shown in FIG. 5, the eccentric arm shaft 31 is rotatably supported by the main mounting plate 11 and the bottom mounting plate 21. Eccentric arm shaft 31 is connected to transmission shaft 8 shown in FIG.

Eccentric arm 30 has an eccentric arm roller 34 near its second longitudinal end. The center axis of the eccentric arm roller 34 is parallel to the Z direction. The eccentric arm roller 34 is rotatable around a central axis. The outer peripheral surface of the eccentric arm roller 34 forms a part of the cam surface 32 of the eccentric arm 30.

The drive arm 40 has a first drive arm 40a and a second drive arm 40b that are arranged on both sides in the Y direction with the eccentric arm shaft 31 and the switching arm shaft 61 interposed therebetween. A first drive arm 40a is arranged in the -Y direction of the eccentric arm shaft 31, and a second drive arm 40b is arranged in the +Y direction. The first drive arm 40a and the second drive arm 40b are formed symmetrically with respect to an XZ plane that includes the central axis of the eccentric arm shaft 31 and the central axis of the switching arm shaft 61 as a plane of symmetry. In the following, the first drive arm 40a will be explained as an example.

The first drive arm 40a is formed into a flat plate shape whose thickness direction is in the Z direction. The first drive arm 40a extends along the X direction. The first drive arm 40a is rotatable around a drive arm shaft 41 arranged at the center in the X direction. The central axis of the drive arm shaft 41 is parallel to the Z direction. The drive arm shaft 41 is arranged in the Y direction of the switching arm shaft 61. Both ends of the drive arm shaft 41 in the Z direction are fixed to the intermediate mounting plate 25 and the bottom mounting plate 21 shown in FIG.

The end of the first drive arm 40a in the +X direction is bent toward the eccentric arm 30. The side surface of the first drive arm 40a facing the eccentric arm 30 is a first contact portion 43a that comes into contact with the cam surface 32 of the eccentric arm 30. The first contact portion 43a has an arc shape when viewed from the Z direction. Similarly, the second drive arm 40b has an arcuate second contact portion 43b that contacts the eccentric arm 30. As shown in FIG. 10, the arc center point 44a of the first contact portion 43a, the rotation center point 30c of the eccentric arm 30, and the arc center point 44b of the second contact portion 43b are on the same straight line L. Placed.

As shown in FIG. 6, the end of the first drive arm 40a in the −X direction is bent toward the operating portion 65 of the toggle spring mechanism 50m. A side surface of the first drive arm 40a facing the operation section 65 is a drive arm pressing section 45 that presses the operation section 65.

As shown in FIG. 6, the toggle spring mechanism 50m includes a spring member 50 that functions as a toggle spring, and a switching arm 60 that functions as a toggle lever.
The spring member 50 is, for example, a coil spring. As shown in FIG. 5, the central axis of the spring member 50 is arranged parallel to the XY plane. A first spring holder 52a and a second spring holder 52b are arranged at both ends of the spring member 50 in the axial direction.

The first spring holder 52a is arranged at the end of the spring member 50 in the -X direction. The first spring holder 52a is rotatable around the first spring holder shaft 51a. The central axis of the first spring holder shaft 51a is parallel to the Z direction. Both ends of the first spring holder shaft 51a in the Z direction are fixed to the main mounting plate 11 and the bottom mounting plate 21. The spring member 50 is hinged to the main mounting plate 11 and the bottom mounting plate 21 at a first joint 91 located at the central axis of the first spring holder shaft 51a.

The second spring holder 52b is arranged at the end of the spring member 50 in the +X direction. The second spring holder 52b is rotatable around the second spring holder shaft 51b. The central axis of the second spring holder shaft 51b is parallel to the Z direction. Both ends of the second spring holder shaft 51b in the Z direction are fixed to the switching arm 60. The spring member 50 and the switching arm 60 are hinged to each other at a second joint 92 located at the central axis of the second spring holder shaft 51b.

FIG. 8 is a perspective view from above of the switching arm. The switching arm 60 has a cylindrical portion 62, a main arm portion 64, and a sub arm portion 63.
The cylindrical portion 62 is formed in a cylindrical shape. A switching arm shaft 61 shown in FIG. 5 is arranged inside the cylindrical portion 62. The central axis of the switching arm shaft 61 is parallel to the Z direction. The central axis of the switching arm shaft 61 is coaxial with the central axis of the cam unit shaft 14 of the switching switch 10 (see FIG. 4). The central axis of the switching arm shaft 61, the central axis of the first spring holder shaft 51a, and the central axis of the eccentric arm shaft 31 are arranged in the same plane. A flange portion is formed at the end of the switching arm shaft 61 in the +Z direction. Both ends of the switching arm shaft 61 in the Z direction are fixed to the intermediate mounting plate 25 and the bottom mounting plate 21. The switching arm 60 is rotatable around a switching arm shaft 61. The switching arm 60 is hinged to the intermediate mounting plate 25 and the bottom mounting plate 21 at a third joint 93 located at the central axis of the switching arm shaft 61 .

The main arm portion 64 and the sub arm portion 63 extend from both ends of the cylindrical portion 62 in the Z direction in the −X direction. As shown in FIG. 8, the main arm portion 64 has an isosceles triangular shape with the cylindrical portion 62 as the apex when viewed from the Z direction. The thickness of the main arm portion 64 in the Z direction at a portion corresponding to the base of the isosceles triangle is thicker than at the center portion of the isosceles triangle. These configurations increase the moment of inertia of switching arm 60.

A guide member 66 is arranged at the center of the main arm portion 64 . As shown in FIG. 5, the guide member 66 is formed in a cylindrical shape and is fixed to the main arm portion 64. As shown in FIG. Both ends of the second spring holder shaft 51b in the Z direction are fixed to the guide member 66 and the sub arm portion 63. A rolling bearing 67 is arranged along the −Z plane of the main arm portion 64. The inner ring of the rolling bearing 67 is fixed to the outer periphery of the guide member 66. The outer ring of the rolling bearing 67 contacts the drive arm 40 . The guide member 66 and the rolling bearing 67 are the operating portion 65 that is pressed by the drive arm 40 . The operating portion 65 is disposed on the second joint 92 coaxially with the central axis of the second spring holder shaft 51b.

As shown in FIG. 8, the main arm portion 64 has a switching arm pressing portion 68 that presses the Geneva driver 70. As shown in FIG. The switching arm pressing section 68 is arranged at the end of the main arm section 64 in the -X direction. The switching arm pressing portion 68 protrudes from the +Z surface of the main arm portion 64 in the +Z direction. A pair of switching arm pressing parts 68a and 68b are arranged apart from each other in the Y direction. The pair of switching arm pressing parts 68a and 68b are arranged at both ends of the base of the isosceles triangle of the main arm part 64. The pair of switching arm pressing parts 68a and 68b are a first switching arm pressing part 68a arranged in the -Y direction and a second switching arm pressing part 68b arranged in the +Y direction. As shown in FIG. 5, the switching arm pressing portion 68 is arranged on the opposite side of the third joint 93 with the second joint 92 in between.

The Geneva mechanism 70m includes a Geneva driver 70 and a Geneva 80, as shown in FIG.
The Geneva driver 70 has a substantially elliptical shape with the X direction as the major axis direction when viewed from the Z direction. A driver shaft 71 is arranged at the center of the Geneva driver 70. Geneva driver 70 is rotatable around a driver shaft 71. The central axis of the driver shaft 71 is parallel to the Z direction. As shown in FIG. 5, both ends of the driver shaft 71 in the Z direction are fixed to the main mounting plate 11 and the intermediate mounting plate 25.

The Geneva driver 70 has a first driver roller 72 at the end in the −X direction. The central axis of the first driver roller 72 is parallel to the Z direction. The first driver roller 72 is rotatable around the central axis. The outer peripheral surface of the first driver roller 72 contacts the switching arm pressing portion 68 of the switching arm 60 .
The Geneva driver 70 has a second driver roller 74 at the end in the +X direction. The central axis of the second driver roller 74 is parallel to the Z direction. The second driver roller 74 is rotatable around the central axis.

The Geneva driver 70 has a pair of flat plates 76 at the ends in the +X direction. The pair of flat plates 76 are arranged at both ends of the Geneva driver 70 in the Z direction. The Geneva driver 70 has a driver side stopper 78 between a pair of flat plates 76. The outer periphery of the driver-side stopper 78 has an arc shape centered on the driver shaft 71 when viewed from the Z direction.

Geneva 80 is formed into a flat plate shape with the thickness direction in the Z direction. The Geneva 80 is fixed to the cam unit shaft 14 of the switching switch 10 (see FIG. 4). As shown in FIG. 5, the central axis of the cam unit shaft 14 is parallel to the Z direction. The cam unit shaft 14 is rotatably supported by the main mounting plate 11 and the switching arm shaft 61. The central axis of the cam unit shaft 14, the central axis of the driver shaft 71, and the central axis of the first spring holder shaft 51a are arranged in the same plane.

As shown in FIG. 7, Geneva 80 is formed into a substantially U-shape when viewed from the Z direction. The Geneva 80 has a slot 82 cut out from the outer periphery toward the cam unit shaft 14. The second driver roller 74 of the Geneva driver 70 enters inside the slot 82 .
Geneva 80 has a stopper 88 on the Geneva side. Geneva side stoppers 88 are formed on the outer periphery of Geneva 80 on both sides of slot 82 . The Geneva-side stopper 88 is formed in an arcuate shape concave toward the cam unit shaft 14 from the outer periphery.

The operation of the energy storage mechanism 20 will be explained.
FIG. 9 is a plan view of the energy storage mechanism in the first state. The eccentric arm 30 is rotated to a position where the eccentric arm roller 34 is arranged in the +Y direction of the eccentric arm shaft 31. The second contact portion 43b of the second drive arm 40b is in contact with the outer peripheral surface of the eccentric arm roller 34. The first contact portion 43a of the first drive arm 40a is in contact with the -Y direction cam surface 32 of the eccentric arm shaft 31. A plane including the central axis of the first spring holder shaft 51a and the central axis of the switching arm shaft 61 of the toggle spring mechanism 50m is defined as a neutral plane S. The second joint 92 of the toggle spring mechanism 50m is arranged in the −Y direction of the neutral plane S.

FIG. 10 is a plan view of the energy storage mechanism in the second state. From the first state shown in FIG. 9, the eccentric arm 30 rotates in the -θ direction. The distance from the central axis of the eccentric arm shaft 31 to the contact point between the cam surface 32 and the first drive arm 40a increases. The eccentric arm 30 presses the first drive arm 40a, and the first drive arm 40a rotates in the -θ direction. The drive arm pressing portion 45 of the first drive arm 40a presses the operating portion 65 of the toggle spring mechanism 50m in the +Y direction. The second joint 92 approaches the neutral plane S. The distance between the second joint 92 and the first joint 91 becomes shorter, the spring member 50 is compressed, and spring force is stored. In the toggle spring mechanism 50m, even if the second joint 92 is pressed with a small force, a large force acts on the spring member 50. The driving load on the energy storage mechanism 20 is suppressed by the toggle spring mechanism 50m.

FIG. 11 is a plan view of the energy storage mechanism in the third state. From the second state shown in FIG. 10, the eccentric arm 30 rotates in the -θ direction. Instead of the cam surface 32 of the eccentric arm 30, an eccentric arm roller 34 presses the first drive arm 40a. The drive arm pressing section 45 presses the operating section 65. The second joint 92 reaches the neutral plane S, and the spring member 50 is fully loaded. By the third state shown in FIG. 11, the drive mechanism 5 shown in FIG. 2 completes the selection operation of the tap selector 2.
As shown in FIG. 11, when the second joint 92 crosses the neutral plane S, the spring force stored in the spring member 50 is released, and the opening operation of the toggle spring mechanism 50m is started.

FIG. 12 is a plan view of the energy storage mechanism in the fourth state. From the third state shown in FIG. 11, the spring member 50 expands and the second joint 92 quickly moves in the +Y direction. The operating portion 65 is separated from the first drive arm 40a. The switching arm 60 hinge-connected at the second joint 92 rotates about the third joint 93 in the −θ direction. Since the moment of inertia of the switching arm 60 is large, the opening operation proceeds all at once, and fluctuations in rotational speed during the opening operation are suppressed. The first switching arm pressing portion 68a of the switching arm 60 presses the first driver roller 72 of the Geneva driver 70 in the +Y direction. The rotation of the first driver roller 72 suppresses friction with the first switching arm pressing portion 68a. Geneva driver 70 rotates in the -θ direction. The second driver roller 74 of the Geneva driver 70 enters the slot 82 of the Geneva 80 . The second driver roller 74 pushes against the side of the slot 82 . The rotation of the second driver roller 74 suppresses friction with the slot 82. Geneva 80 rotates in the +θ direction. The cam unit shaft 14 rotates, and tap switching of the switching switch 10 (see FIG. 4) is performed quickly. The first switching arm pressing portion 68a is arranged on the opposite side of the third joint 93 with the second joint 92 in between. Since the moving distance of the first switching arm pressing portion 68a is long, the degree of freedom in designing the rotation angle of the cam unit shaft 14 is large.

FIG. 13 is a plan view of the energy storage mechanism in the fifth state. From the fourth state shown in FIG. 12, the second joint 92 moves in the +Y direction by the opening operation of the toggle spring mechanism 50m. The switching arm 60, Geneva driver 70, and Geneva 80 rotate in conjunction.

FIG. 14 is a plan view of the energy storage mechanism in the sixth state. From the fifth state shown in FIG. 13, the second joint 92 moves in the +Y direction by the opening operation of the toggle spring mechanism 50m. Geneva driver 70 and Geneva 80 rotate in conjunction. The driver-side stopper 78 of the Geneva driver 70 contacts the Geneva-side stopper 88 of the Geneva 80. The rotation of Geneva driver 70 and Geneva 80 stops. The rotation of the cam unit shaft 14 is stopped, and the tap switching of the switching switch 10 is completed. The switching arm 60 stops rotating, and the second joint 92 stops moving in the +Y direction. The spring member 50 stops expanding in the compressed state. The first switching arm pressing portion 68a presses the first driver roller 72 in the +Y direction when the switching operation of the switching switch 10 is completed. Thereby, the switching switch 10 is maintained in a state in which tap switching is completed.

From the fifth state shown in FIG. 13 to the sixth state shown in FIG. 14, the eccentric arm 30 rotates in the -θ direction. The first drive arm 40a rotates in the -θ direction and comes into contact with the operating section 65 again. The operating portion 65 comes into contact with the second drive arm 40b. The second drive arm 40b rotates in the -θ direction and comes into contact with the eccentric arm 30. In the sixth state shown in FIG. 14, the eccentric arm 30 is rotated to a position where the eccentric arm roller 34 is arranged in the -Y direction of the eccentric arm shaft 31. From the first state to the sixth state, the eccentric arm 30 rotates 180° in the −θ direction.
Next, when performing tap switching of the switching switch 10, the energy storage mechanism 20 performs a reverse operation from the sixth state to the first state. The eccentric arm 30 rotates 180° in the +θ direction.

As shown in FIG. 1, the switching switch 10 including the energy storage mechanism 20 is arranged inside a cylindrical container 10a and immersed in insulating oil. Abnormal situations such as an increase in the viscosity of the insulating oil or foreign matter entering the switching switch 10 are assumed. In these abnormal situations, there is a possibility that the opening operation of the toggle spring mechanism 50m from the third state (see FIG. 11) to the sixth state (see FIG. 14) stops midway. In this case, tap switching of the switching switch 10 is stopped midway.

As described above, in the opening operation of the toggle spring mechanism 50m, the second joint 92 quickly moves in the +Y direction. At this time, the operating section 65 separates from the first drive arm 40a. When the opening operation of the toggle spring mechanism 50m stops midway, the movement of the second joint 92 in the +Y direction stops. Even in this case, the eccentric arm 30 continues to rotate from the third state shown in FIG. 11. The first drive arm 40a rotates in the -θ direction and comes into contact with the operating section 65 again. The first drive arm 40a continues to push the operating portion 65 in the +Y direction until the switching operation of the switching switch 10 is completed in the sixth state shown in FIG. 14. Thereby, the energy storage mechanism 20 forcibly completes the switching operation of the switching switch 10 even if the opening operation of the toggle spring mechanism 50m is stopped midway.

As detailed above, the energy storage mechanism 20 of the on-load tap changer 1 of the embodiment includes the drive arm 40, the toggle spring mechanism 50m, and the Geneva mechanism 70m. The drive arm 40 is rotated by external force. The toggle spring mechanism 50m is energized by pressing the operating portion 65 by the drive arm 40. The Geneva mechanism 70m drives the switching switch 10 in conjunction with the opening operation of the toggle spring mechanism 50m. The drive arm 40 can press the operating portion 65 to a position where the switching operation of the switching switch 10 is completed.

Even if the opening operation of the toggle spring mechanism 50m is stopped midway, the drive arm 40 can press the operating portion 65 to the position where the switching operation of the switching switch 10 is completed. The drive arm 40 forcibly completes the switching operation of the switching switch 10. By the drive arm 40, toggle spring mechanism 50m, and Geneva mechanism 70m connected in series, the energy storing and releasing operations and the forced switching operation of the switching switch 10 are performed continuously. Thereby, the drive load of the energy storage mechanism 20 is efficiently utilized, and the forced switching operation of the switching switch 10 is realized. Therefore, the driving load on the energy storage mechanism 20 is suppressed. Since the energy storage mechanism 20 has fewer components, the energy storage mechanism 20 can be made smaller and lower in cost.

The Geneva mechanism 70m includes a Geneva driver 70 and a Geneva 80. The Geneva driver 70 is rotated by the opening operation of the toggle spring mechanism 50m. The Geneva 80 rotates as a result of the rotation of the Geneva driver 70 and drives the switching switch 10 .
With this structure, the cam unit shaft 14 of the switching switch 10 rotates by a predetermined angle to perform tap switching.

The toggle spring mechanism 50m includes a spring member 50 and a switching arm 60. Spring member 50 is hinged to main mounting plate 11 and bottom mounting plate 21 at a first joint 91 . Spring member 50 and switching arm 60 are hinged to each other at second joint 92 . The switching arm 60 is hinged to the intermediate mounting plate 25 and the bottom mounting plate 21 at a third joint 93 . The operating section 65 is arranged at the second joint 92.

In the toggle spring mechanism 50m, even if the operating portion 65 of the second joint 92 is pressed with a small force, a large force acts on the spring member 50. Therefore, the driving load on the energy storage mechanism 20 is suppressed.

The energy storage mechanism 20 further includes an eccentric arm 30 that rotates by external force and presses the drive arm 40. The drive arm 40 has a first drive arm 40a and a second drive arm 40b arranged on both sides of the rotation axis of the eccentric arm 30.

By reversing the rotational direction of the eccentric arm 30, the drive arm 40 that presses the operating section 65 is switched, and the moving direction of the operating section 65 is reversed. As a result, the rotational direction of the cam unit shaft 14 of the switching switch 10 is reversed. Accordingly, the step rotation angle of the cam unit 15 can be set to a maximum of 120 degrees, improving the degree of freedom in design. Since the rotational direction of the cam unit shaft 14 is reversed, the cam groove of the cam unit 15 and the driven portion of the switching unit 12 correspond one to one. As a result, variations in the switching sequence of the switching switch 10 are reduced, and the number of man-hours for testing the switching sequence is reduced.

The first drive arm 40a has an arcuate first contact portion 43a that contacts the eccentric arm 30. The second drive arm 40b has an arcuate second contact portion 43b that contacts the eccentric arm 30. The arc center point 44a of the first contact portion 43a, the rotation center point 30c of the eccentric arm 30, and the arc center point 44b of the second contact portion are arranged on the same straight line L.
As a result, the energy storage mechanism 20 operates in the same manner regardless of the rotation direction of the eccentric arm 30.

The switching arm 60 has a switching arm pressing portion 68 that presses the Geneva driver 70 to rotate it. The switching arm pressing portion 68 is arranged on the opposite side of the third joint 93 with the second joint 92 interposed therebetween.
Since the moving distance of the first switching arm pressing portion 68a becomes longer, the rotation angles of the Geneva driver 70 and the Geneva 80 increase. This improves the degree of freedom in designing the rotation angle of the cam unit shaft 14.

The switching arm 60 has a switching arm pressing portion 68 that presses the Geneva driver 70 to rotate it. The switching arm pressing section 68 presses the Geneva driver 70 in a state where the switching operation of the switching switch 10 is completed.
Thereby, the switching switch 10 is maintained in a state in which tap switching is completed.

The on-load tap changer 1 includes the energy storage mechanism 20 described above, the switching switch 10, and the tap selector 2.
Thereby, the on-load tap changer 1 in which the driving load of the energy storage mechanism 20 is suppressed is provided.

According to at least one of the embodiments described above, the driving arm 40 is provided that can push the operating section 65 to the position where the switching operation of the switching switch 10 is completed. Thereby, the driving load on the energy storage mechanism 20 can be suppressed.

Although several embodiments of the invention have been described, these embodiments are 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, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention as well as within the scope of the invention described in the claims and its equivalents.

L... Straight line, 1... Load tap changer, 2... Tap selector, 10... Switching switch, 11... Main mounting plate (mounting member), 20... Energy storage mechanism, 21... Bottom mounting plate (mounting member), 25... Intermediate mounting plate (mounting member), 30... Eccentric arm, 30c... Rotation center point, 40... Drive arm, 40a... First drive arm, 40b... Second drive arm, 43a... First contact portion, 43b... Second contact portion, 44a...Circular arc center point, 44b...Circular arc center point, 50m...Toggle spring mechanism, 50...Spring member, 60...Switching arm, 65...Operation unit, 68...Pushing part, 70m...Geneva mechanism, 70... Geneva driver, 80... Geneva, 91... first joint, 92... second joint, 93... third joint.

Claims (4)

an eccentric arm that rotates due to external force;
a drive arm whose first end is rotated by being pressed by the eccentric arm ;
a toggle spring mechanism in which an operating section is pressed by the second end of the drive arm to store energy when the second end is on the opposite side of the first end across the rotation axis of the drive arm;
a Geneva mechanism that drives a switching switch in conjunction with the opening operation of the toggle spring mechanism;
The toggle spring mechanism has a spring member and a switching arm,
the spring member is hinged to the mounting member at a first joint;
the spring member and the switching arm are hinged to each other at a second joint;
the switching arm is hinged to the mounting member at a third joint;
The operating section is arranged at the second joint,
The Geneva mechanism includes a Geneva driver that rotates when the toggle spring mechanism opens, and a Geneva that rotates as a result of the rotation of the Geneva driver and drives the switching switch.
The switching arm has a switching arm pressing part that presses and rotates the Geneva driver,
The switching arm pressing part presses the Geneva driver in a state where the switching operation of the switching switch is completed,
the operating portion is separated from the second end of the drive arm by the opening operation of the toggle spring mechanism;
The second end of the drive arm is capable of abutting the operating portion again as the eccentric arm continues to rotate, and pushing the operating portion to a position where the switching operation of the switching switch is completed;
The drive arm has a first drive arm and a second drive arm arranged on both sides of the rotation axis of the eccentric arm.
Energy storage mechanism for tap changer on load. The first drive arm has an arcuate first contact portion that comes into contact with the eccentric arm,
The second drive arm has an arcuate second contact portion that comes into contact with the eccentric arm,
a circular arc center point of the first contact portion, a rotation center point of the eccentric arm, and a circular arc center point of the second contact portion are arranged on the same straight line;
An energy storage mechanism for an on-load tap changer according to claim 1 . The switching arm pressing part is arranged on the opposite side of the third joint with the second joint interposed therebetween.
An energy storage mechanism for an on-load tap changer according to claim 1 . It has the energy storage mechanism of the on-load tap changer according to any one of claims 1 to 3 , the switching switch, and a tap selector.
On-load tap changer.

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