WO2021229736A1 - 負荷時タップ切換器の蓄勢機構および負荷時タップ切換器 - Google Patents

負荷時タップ切換器の蓄勢機構および負荷時タップ切換器 Download PDF

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Publication number
WO2021229736A1
WO2021229736A1 PCT/JP2020/019190 JP2020019190W WO2021229736A1 WO 2021229736 A1 WO2021229736 A1 WO 2021229736A1 JP 2020019190 W JP2020019190 W JP 2020019190W WO 2021229736 A1 WO2021229736 A1 WO 2021229736A1
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WO
WIPO (PCT)
Prior art keywords
arm
switching
energy storage
geneva
tap changer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/019190
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English (en)
French (fr)
Japanese (ja)
Inventor
直紀 江口
真一郎 阿部
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Toshiba Energy Systems and Solutions Corp
Original Assignee
Toshiba Corp
Toshiba Energy Systems and Solutions Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Toshiba Energy Systems and Solutions Corp filed Critical Toshiba Corp
Priority to PCT/JP2020/019190 priority Critical patent/WO2021229736A1/ja
Priority to JP2022522422A priority patent/JP7362914B2/ja
Publication of WO2021229736A1 publication Critical patent/WO2021229736A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current

Definitions

  • An embodiment of the present invention relates to a storage mechanism of a load tap changer and a load tap changer.
  • the load tap changer is a device that switches taps during transformer operation (during load).
  • the load tap changer includes a tap selector and a switching switch.
  • the tap selector selects the tap to operate in the transformer tap winding.
  • the switching switch switches the circuit to the selected tap.
  • the energy storage mechanism of the switching switch instantly switches taps. The energy storage mechanism is required to suppress the drive load.
  • An object to be solved by the present invention is to provide a storage mechanism of a load tap changer and a load tap changer capable of suppressing a drive load.
  • the energy storage mechanism of the load tap changer of the embodiment has a drive arm, a toggle spring mechanism, and a Geneva mechanism.
  • the drive arm is rotated by an external force.
  • the toggle spring mechanism is stored by pressing the operation unit by the drive arm.
  • the Geneva mechanism drives the switching switch in conjunction with the opening operation of the toggle spring mechanism.
  • the drive arm can press the operation unit to a position where the switching operation of the switching switch is completed.
  • the perspective view of the tap changer under load of embodiment Perspective view of the tap changer under load excluding the cylindrical container.
  • a perspective view from above of the drive mechanism. A perspective view from below of the switching switch.
  • a side sectional view of the energy storage mechanism of the embodiment A perspective view from below of the energy storage mechanism.
  • a perspective view from above of the energy storage mechanism. A perspective view from above the switching arm.
  • Top view of the fourth state of the energy storage mechanism Top view of the fifth state of the energy storage mechanism.
  • Top view of the sixth state of the energy storage mechanism Top view of the first state of the energy storage mechanism.
  • FIG. 1 is a perspective view of the load tap changer of the embodiment.
  • FIG. 2 is a perspective view of the tap changer under load excluding the cylindrical container.
  • the load tap changer 1 is a device that adjusts the voltage by changing the turns ratio (transformation ratio) of the transformer in the operating state.
  • the 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 of selecting a tap to be operated 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 of switching the circuit to the selected tap.
  • the switching switch 10 switches between the selected energized tap and the non-energized tap.
  • the switching switch 10 is arranged inside the cylindrical container 10a and immersed in insulating oil.
  • the drive mechanism 5 drives the tap selector 2 and the switching switch 10 by the driving force transmitted from the electric operating device (not shown) via the drive shaft 6.
  • FIG. 3 is a perspective view from above of the drive mechanism.
  • the drive shaft 6 is connected to the transmission shaft 8 via the gear train 7.
  • the transmission shaft 8 penetrates 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 the cylindrical container 10a shown in FIG.
  • the switching switch 10 has a shutoff mechanism for switching the energization path and a power storage mechanism 20 for driving the shutoff 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 in the center of the switching unit 12 of each phase.
  • the cam unit 15 rotates forward and reverse by a predetermined angle to switch the switching unit 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 stores the toggle spring mechanism 50 m by the driving force transmitted via the transmission shaft 8 shown in FIG.
  • the energy storage mechanism 20 swiftly rotates the cam unit shaft 14 by a predetermined angle in the forward and reverse directions by the opening operation of the toggle spring mechanism 50 m.
  • FIG. 5 is a side sectional view of the energy storage mechanism of the embodiment in the VV line of FIG. 5 shows a state in which the eccentric arm roller 34 is brought close to the switching arm shaft 61.
  • the Z direction is a direction along the central axis of the switching arm shaft 61 arranged coaxially with the cam unit shaft 14.
  • the Z direction is the vertical direction
  • the + Z direction is the upward direction.
  • the X direction is a direction perpendicular to the Z direction in 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 the 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 orthogonal to the Z direction and the X direction.
  • the X and Y directions are horizontal.
  • the circumferential direction in the Z direction is defined as the ⁇ direction.
  • the + ⁇ direction is the rotation direction of the right-hand screw traveling 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.
  • the energy storage mechanism 20 includes an eccentric arm 30, a drive arm 40, a toggle spring mechanism 50 m, and a Geneva mechanism 70 m.
  • the eccentric arm 30 has a substantially egg shape when viewed from the Z direction.
  • the side surface of the eccentric arm 30 is a cam surface 32 that abuts on the drive arm 40.
  • Protruding portions 33 protruding 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 from the cam surface 32.
  • the eccentric arm shaft 31 is inserted near the first end of the eccentric arm 30 in the long axis direction when viewed from the Z direction.
  • the central axis of the eccentric arm shaft 31 is parallel to the Z direction.
  • the eccentric arm 30 is fixed to the eccentric arm shaft 31.
  • the eccentric arm shaft 31 is rotatably supported by the main mounting plate 11 and the bottom mounting plate 21.
  • the eccentric arm shaft 31 is connected to the transmission shaft 8 shown in FIG.
  • the eccentric arm 30 has an eccentric arm roller 34 near the second end in the major axis direction.
  • the central 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 arranged on both sides in the Y direction with the eccentric arm shaft 31 and the switching arm shaft 61 interposed therebetween.
  • the first drive arm 40a is arranged in the ⁇ Y direction of the eccentric arm shaft 31, and the 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 the XZ plane including the central axis of the eccentric arm shaft 31 and the central axis of the switching arm shaft 61 as symmetrical planes.
  • the first drive arm 40a will be described as an example.
  • the first drive arm 40a is formed in a flat plate shape with the Z direction as the thickness 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 bends 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 abuts on the cam surface 32 of the eccentric arm 30.
  • the first contact portion 43a has an arc shape when viewed from the Z direction.
  • 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 43b are on the same straight line L. Be placed.
  • the end portion of the first drive arm 40a in the ⁇ X direction bends toward the operation portion 65 of the toggle spring mechanism 50 m.
  • the side surface of the first drive arm 40a facing the operation unit 65 is a drive arm pressing unit 45 that presses the operation unit 65.
  • the toggle spring mechanism 50m has 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.
  • 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 the first joint 91, which is the position of 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 the second joint 92, which is the position of 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 tubular portion 62, a main arm portion 64, and a sub arm portion 63.
  • the tubular portion 62 is formed in a cylindrical shape.
  • the switching arm shaft 61 shown in FIG. 5 is arranged inside the tubular 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 the switching arm shaft 61.
  • the switching arm 60 is hinged to the intermediate mounting plate 25 and the bottom mounting plate 21 at the third joint 93, which is the position of the central axis of the switching arm shaft 61.
  • the main arm portion 64 and the sub arm portion 63 extend in the ⁇ X direction from both ends of the tubular portion 62 in the Z direction.
  • the main arm portion 64 has an isosceles triangle shape with the tubular portion 62 as the apex when viewed from the Z direction.
  • the thickness of the main arm portion 64 in the Z direction at the portion corresponding to the base of the isosceles triangle is thicker than that of the central portion of the isosceles triangle.
  • 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. 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. Rolling bearings 67 are 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 comes into contact with the drive arm 40. The guide member 66 and the rolling bearing 67 are operation portions 65 pressed by the drive arm 40. The operation unit 65 is arranged on the second joint 92 coaxially with the central axis of the second spring holder shaft 51b.
  • the main arm portion 64 has a switching arm pressing portion 68 that presses the Geneva driver 70.
  • the switching arm pressing portion 68 is arranged at the end portion of the main arm portion 64 in the ⁇ X direction.
  • the switching arm pressing portion 68 projects in the + Z direction from the + Z plane of the main arm portion 64.
  • the pair of switching arm pressing portions 68a and 68b are arranged apart from each other in the Y direction.
  • the pair of switching arm pressing portions 68a and 68b are arranged at both ends of the base of the isosceles triangle of the main arm portion 64.
  • the pair of switching arm pressing portions 68a and 68b are a first switching arm pressing portion 68a arranged in the ⁇ Y direction and a second switching arm pressing portion 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 interposed therebetween.
  • the Geneva mechanism 70m has 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.
  • the Geneva driver 70 is rotatable around the 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 a central axis.
  • the outer peripheral surface of the first driver roller 72 comes into contact with 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 circumference of the driver-side stopper 78 has an arc shape centered on the driver shaft 71 when viewed from the Z direction.
  • the Geneva 80 is formed in a flat plate shape with the Z direction as the thickness direction.
  • the Geneva 80 is fixed to the cam unit shaft 14 of the switching switch 10 (see FIG. 4).
  • 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.
  • the Geneva 80 is formed in a substantially U shape when viewed from the Z direction.
  • the Geneva 80 has a slot 82 cut out from the outer circumference toward the cam unit shaft 14.
  • the second driver roller 74 of the Geneva driver 70 enters the inside of the slot 82.
  • the Geneva 80 has a Geneva side stopper 88.
  • the Geneva side stopper 88 is formed on the outer periphery of the Geneva 80 on both sides of the slot 82.
  • the Geneva side stopper 88 is formed in an arc shape that is recessed from the outer periphery toward the cam unit shaft 14.
  • FIG. 9 is a plan view of the first state of the energy storage mechanism.
  • the eccentric arm 30 rotates at 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 cam surface 32 in the ⁇ Y direction of the eccentric arm shaft 31.
  • the surface including the central axis of the first spring holder shaft 51a of the toggle spring mechanism 50 m and the central axis of the switching arm shaft 61 is defined as the neutral surface S.
  • the second joint 92 of the toggle spring mechanism 50 m is arranged in the ⁇ Y direction of the neutral surface S.
  • FIG. 10 is a plan view of the second state of the energy storage mechanism. From the first state shown in FIG. 9, the eccentric arm 30 rotates in the ⁇ 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 ⁇ direction. The drive arm pressing portion 45 of the first drive arm 40a presses the operating portion 65 of the toggle spring mechanism 50 m 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 is shortened, the spring member 50 is compressed, and the 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 toggle spring mechanism 50 m suppresses the drive load of the energy storage mechanism 20.
  • FIG. 11 is a plan view of the third state of the energy storage mechanism. From the second state shown in FIG. 10, the eccentric arm 30 rotates in the ⁇ direction. Instead of the cam surface 32 of the eccentric arm 30, the eccentric arm roller 34 presses the first drive arm 40a. The drive arm pressing unit 45 presses the operation unit 65. The second joint 92 reaches the neutral surface S, and the spring member 50 is maximally stored. 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 exceeds the neutral surface S, the spring force stored in the spring member 50 is released, and the opening operation of the toggle spring mechanism 50 m is started.
  • FIG. 12 is a plan view of the fourth state of the energy storage mechanism. From the third state shown in FIG. 11, the spring member 50 extends and the second joint 92 swiftly moves in the + Y direction.
  • the operation unit 65 is separated from the first drive arm 40a.
  • the switching arm 60 hinged at the second joint 92 rotates about the third joint 93 in the ⁇ direction. Since the moment of inertia of the switching arm 60 is large, the opening operation proceeds at once, and the fluctuation of the rotation speed during the opening operation is 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.
  • the Geneva driver 70 rotates in the ⁇ 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 the side surface of the slot 82. Friction with the slot 82 is suppressed by the rotation of the second driver roller 74.
  • the Geneva 80 rotates in the + ⁇ direction.
  • the cam unit shaft 14 rotates, and the tap switching of the switching switch 10 (see FIG. 4) is swiftly performed.
  • the first switching arm pressing portion 68a 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 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 fifth state of the energy storage mechanism. 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 50 m. The switching arm 60, the Geneva driver 70, and the Geneva 80 rotate in conjunction with each other.
  • FIG. 14 is a plan view of the sixth state of the energy storage mechanism. 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 50 m.
  • the Geneva driver 70 and the Geneva 80 rotate in conjunction with each other.
  • the driver-side stopper 78 of the Geneva driver 70 comes into contact with the Geneva-side stopper 88 of the Geneva 80.
  • the rotation of the Geneva driver 70 and the Geneva 80 is stopped.
  • the rotation of the cam unit shaft 14 is stopped, and the tap switching of the switching switch 10 is completed.
  • the rotation of the switching arm 60 is stopped, and the movement of the second joint 92 in the + Y direction is stopped.
  • the spring member 50 stops stretching in a compressed state.
  • the first switching arm pressing portion 68a presses the first driver roller 72 in the + Y direction in a state where the switching operation of the switching switch 10 is completed. As a result, the switching switch 10 is held in a state where tap switching is completed.
  • the eccentric arm 30 rotates in the ⁇ direction.
  • the first drive arm 40a rotates in the ⁇ direction and comes into contact with the operation unit 65 again.
  • the operation unit 65 comes into contact with the second drive arm 40b.
  • the second drive arm 40b rotates in the ⁇ direction and comes into contact with the eccentric arm 30.
  • 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 eccentric arm 30 rotates 180 ° in the ⁇ direction.
  • the energy storage mechanism 20 operates in the reverse manner from the sixth state to the first state.
  • the eccentric arm 30 rotates 180 ° in the + ⁇ direction.
  • the switching switch 10 including the energy storage mechanism 20 is arranged inside the cylindrical container 10a and is immersed in insulating oil.
  • An abnormal situation such as an increase in the viscosity of the insulating oil or a foreign substance mixed in the switching switch 10 is assumed.
  • the opening operation of the toggle spring mechanism 50 m from the third state (see FIG. 11) to the sixth state (see FIG. 14) may be stopped in the middle. In this case, the tap switching of the switching switch 10 is stopped halfway.
  • the second joint 92 swiftly moves in the + Y direction in the opening operation of the toggle spring mechanism 50 m.
  • the operation unit 65 is separated from the first drive arm 40a.
  • the opening operation of the toggle spring mechanism 50m is stopped in the middle, the movement of the second joint 92 in the + Y direction is stopped.
  • the eccentric arm 30 continues to rotate from the third state shown in FIG.
  • the first drive arm 40a rotates in the ⁇ direction and comes into contact with the operation unit 65 again.
  • the first drive arm 40a continues to push the operation unit 65 in the + Y direction until the switching operation of the switching switch 10 is completed in the sixth state shown in FIG.
  • 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 in the middle.
  • the energy storage mechanism 20 of the load tap changer 1 of the embodiment includes a drive arm 40, a toggle spring mechanism 50 m, and a Geneva mechanism 70 m.
  • the drive arm 40 is rotated by an external force.
  • the toggle spring mechanism 50m is stored by pressing the operation unit 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 operation unit 65 to a position where the switching operation of the switching switch 10 is completed.
  • the drive arm 40 can press the operation unit 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 50 m is stopped in the middle.
  • the drive arm 40 forcibly completes the switching operation of the switching switch 10.
  • a drive arm 40, a toggle spring mechanism 50 m, and a Geneva mechanism 70 m connected in series enable a continuous energization and opening operation and a forced switching operation of the switching switch 10.
  • the forced switching operation of the switching switch 10 is realized by efficiently utilizing the drive load of the energy storage mechanism 20. Therefore, the drive load of the energy storage mechanism 20 is suppressed. Since the number of components of the energy storage mechanism 20 is small, the energy storage mechanism 20 can be miniaturized and reduced 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 50 m.
  • the Geneva 80 is driven by the rotation of the Geneva driver 70 to drive the switching switch 10. With this structure, the cam unit shaft 14 of the switching switch 10 is rotated by a predetermined angle, and tap switching is executed.
  • the toggle spring mechanism 50m has a spring member 50 and a switching arm 60.
  • the spring member 50 is hinged to the main mounting plate 11 and the bottom mounting plate 21 at the first joint 91.
  • the spring member 50 and the switching arm 60 are hinged to each other at the second joint 92.
  • the switching arm 60 is hinged to the intermediate mounting plate 25 and the bottom mounting plate 21 at the third joint 93.
  • the operation unit 65 is arranged at the second joint 92.
  • the energy storage mechanism 20 further has an eccentric arm 30 that is rotated by an external force to press 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.
  • the drive arm 40 that presses the operation unit 65 is switched, and the movement direction of the operation unit 65 is reversed.
  • the rotation direction of the cam unit shaft 14 of the switching switch 10 is reversed.
  • the step rotation angle of the cam unit 15 can be set up to 120 °, which improves the degree of freedom in design. Since the rotation 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 have a one-to-one correspondence. As a result, the variation in the switching sequence of the switching switch 10 is reduced, and the man-hours for inspecting the switching sequence are reduced.
  • the first drive arm 40a has an arc-shaped first contact portion 43a that abuts on 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 and rotates the Geneva driver 70.
  • 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 long, 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 and rotates the Geneva driver 70.
  • the switching arm pressing portion 68 presses the Geneva driver 70 in a state where the switching operation of the switching switch 10 is completed. As a result, the switching switch 10 is held in a state where tap switching is completed.
  • the load tap changer 1 includes the above-mentioned energy storage mechanism 20, a switching switch 10, and a tap selector 2. As a result, the load tap changer 1 that suppresses the drive load of the energy storage mechanism 20 is provided.
  • the drive arm 40 has a drive arm 40 capable of pressing the operation unit 65 to a position where the switching operation of the switching switch 10 is completed. As a result, the drive load of the energy storage mechanism 20 can be suppressed.

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  • Power Engineering (AREA)
  • Transmission Devices (AREA)
PCT/JP2020/019190 2020-05-14 2020-05-14 負荷時タップ切換器の蓄勢機構および負荷時タップ切換器 Ceased WO2021229736A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2020/019190 WO2021229736A1 (ja) 2020-05-14 2020-05-14 負荷時タップ切換器の蓄勢機構および負荷時タップ切換器
JP2022522422A JP7362914B2 (ja) 2020-05-14 2020-05-14 負荷時タップ切換器の蓄勢機構および負荷時タップ切換器

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