CN113874969A

CN113874969A - Switching switch of load tap changer and load tap changer

Info

Publication number: CN113874969A
Application number: CN201980096794.7A
Authority: CN
Inventors: 江口直纪; 阿部真一郎
Original assignee: Toshiba Corp; Toshiba Energy Systems and Solutions Corp
Current assignee: Toshiba Corp; Toshiba Energy Systems and Solutions Corp
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2021-12-31
Anticipated expiration: 2039-05-30
Also published as: CN113874969B; JPWO2020240781A1; JP7119226B2; WO2020240781A1

Abstract

The switching switch of the load tap changer of the embodiment has a first tap terminal and a second tap terminal, a valve, a first current limiting resistor and a second current limiting resistor. The first tap terminal and the second tap terminal are connected to a tap selector of a tap changer when the load is applied. The valve is connected to the first tap terminal via a first valve switch and to the second tap terminal via a second valve switch. A first current limiting resistor is connected to the first tap terminal via a first resistive switch in parallel with the valve. A second current limiting resistor is connected to the second tap terminal via a second resistive switch in parallel with the valve.

Description

Switching switch of load tap changer and load tap changer

Technical Field

Embodiments of the present invention relate to a switching switch for a tap changer during load and a tap changer during load.

Background

A load tap changer is a device that switches a tap during operation of a transformer (during load). Generally, a load tap changer includes a tap selector and a switching switch. A tap selector selects a tap for operation in a tap winding of the transformer. The switching switch switches the circuit to the selected tap. The switching switch has a current limiting resistor that temporarily supplies current prior to switching of the circuit. The current limiting resistor generates heat as the current is applied. It is required to suppress heat generation of the current limiting resistor.

Documents of the prior art

Patent document

Patent document 1 Japanese patent No. 5707071

Patent document 2 Japanese patent No. 6067220

Disclosure of Invention

Problems to be solved by the invention

The invention provides a switch of a tap switch during load and a tap switch during load, which can inhibit the heating of a current-limiting resistor.

Means for solving the problems

Drawings

Fig. 1 is a perspective view of a tap changer in a load according to an embodiment.

Fig. 2 is a circuit diagram of each phase of the switching shutter of the embodiment.

Fig. 3 is a perspective view of the switching shutter of the embodiment.

Fig. 4 is a perspective view of the switching unit.

Fig. 5 is a first explanatory diagram of the operation of the valve opening/closing mechanism.

Fig. 6 is a second explanatory diagram of the operation of the valve opening/closing mechanism.

Fig. 7 is a perspective view of the fixed portion of the switch assembly viewed from the-R direction.

Fig. 8 is a perspective view of the fixed portion of the switch assembly viewed from the + R direction.

Fig. 9 is a perspective view of the first movable portion.

Fig. 10 is a perspective view of the second movable portion.

Fig. 11 is a perspective view of the cam unit.

Fig. 12 is a first explanatory view of the operation of the movable portion.

Fig. 13 is a second explanatory view of the operation of the movable portion.

Fig. 14 is a third explanatory view of the operation of the movable portion.

Fig. 15 is a fourth explanatory view of the operation of the movable portion.

Fig. 16 is a fifth explanatory view of the operation of the movable portion.

Fig. 17 is an explanatory diagram of a first connecting rod.

Fig. 18 is an explanatory view of the second connecting rod.

Fig. 19 is a perspective view of the second cam rotation control mechanism.

Fig. 20 is a timing chart of the switching operation of the switching shutter.

Fig. 21 is an explanatory diagram of a change in the energization state in the switching operation from the first tap terminal to the second tap terminal.

Fig. 22 is an explanatory diagram of a change in the energization state in the reverse switching operation from the second tap terminal to the first tap terminal.

Fig. 23 is an explanatory view of the operation of the first movable unit at time a.

Fig. 24 is an explanatory diagram of the operation of the valve opening/closing mechanism at time a.

Fig. 25 is an explanatory view of the operation of the second movable portion at time a.

Fig. 26 is a first operation explanatory diagram of the second cam rotation control mechanism at time a.

Fig. 27 is a second operation explanatory diagram of the second cam rotation control mechanism at time a.

Fig. 28 is an explanatory diagram of the operation of the first movable unit at time C.

Fig. 29 is an explanatory diagram of the operation of the valve opening/closing mechanism at time C.

Fig. 30 is an explanatory view of the operation of the second movable unit at time C.

Fig. 31 is a first operation explanatory diagram of the second cam rotation control mechanism at time C.

Fig. 32 is a second operation explanatory diagram of the second cam rotation control mechanism at time C.

Fig. 33 is an explanatory view of the operation of the first movable unit at time D.

Fig. 34 is an explanatory diagram of the operation of the valve opening/closing mechanism at time D.

Fig. 35 is an explanatory view of the operation of the second movable portion at time D.

Fig. 36 is a first operation explanatory diagram of the second cam rotation control mechanism at time D.

Fig. 37 is a second operation explanatory diagram of the second cam rotation control mechanism at time D.

Fig. 38 is an explanatory view of the operation of the first movable unit at time F.

Fig. 39 is an explanatory diagram of the operation of the valve opening/closing mechanism at time F.

Fig. 40 is a first operation explanatory diagram of the second cam rotation control mechanism at time F.

Fig. 41 is an explanatory diagram of the operation of the first movable unit at time H.

Fig. 42 is an explanatory diagram of the operation of the valve opening/closing mechanism at time H.

Fig. 43 is a first operation explanatory diagram of the second cam rotation control mechanism at time H.

Fig. 44 is an explanatory diagram of the operation of the first movable unit at time Q.

Fig. 45 is an explanatory diagram of the operation of the valve opening/closing mechanism at time Q.

Fig. 46 is an explanatory diagram of the operation of the second movable unit at time Q.

Fig. 47 is a first operation explanatory diagram of the second cam rotation control mechanism at time Q.

Fig. 48 is a second operation explanatory diagram of the second cam rotation control mechanism at time Q.

Detailed Description

Hereinafter, a switching switch of a load tap changer and a load tap changer according to the embodiment will be described with reference to the drawings.

Fig. 1 is a perspective view of a tap changer 1 in a load state according to the embodiment. The load-time tap changer 1 is a device that changes the turns ratio (transformation ratio) of a transformer in an operating state to adjust a voltage. The load-time tap changer 1 includes a tap selector 2, a drive mechanism 5, and a switching shutter 10.

The tap selector 2 performs a selection operation of selecting a tap operated in a tap winding of the transformer. The driving mechanism 5 drives the tap selector 2 by a driving force transmitted from an electric operation device (not shown) via a driving shaft 6.

The switching switch 10 performs a switching operation for switching the circuit to the selected tap. The switching switch 10 is disposed inside the cylindrical container 10a and is immersed in insulating oil.

The switching shutter 10 of the embodiment is explained in detail.

Fig. 2 is a circuit diagram of the switching switch 10 of the embodiment, showing each phase of three-phase alternating current. Hereinafter, unless specifically mentioned, the constitution of each phase of the switching shutter 10 is explained. The switching shutter 10 is a small-capacity switching shutter having one valve V. The switching switch 10 switches a circuit between the first tap terminal T1 and the second tap terminal T2. The first tap terminal T1 and the second tap terminal T2 are connected to the tap selector 2 shown in fig. 1 through wiring 3.

As shown in fig. 2, the switching shutter 10 has a valve V, a first valve switch SV1, and a second valve switch SV 2. The switching switch 10 also has a first current limiting resistor R1, a first resistive switch SR1, a second current limiting resistor R2, and a second resistive switch SR 2. The switching switch 10 also has a first energizing switch SM1 and a second energizing switch SM 2.

The valve V is a vacuum interrupter using vacuum as the insulating arc-extinguishing medium. A first end of the valve V is connected to a first tap terminal T1 via a first valve switch SV 1. A first end of the valve V is connected to a second tap terminal T2 via a second valve switch SV 2. The second end of the valve V is connected to a neutral terminal 18.

The first valve switch SV1 has a valve switch terminal 35V, a valve switch common terminal 32V, and a valve switch conductor 45V. The valve switch terminal 35V is connected to a first end portion of the valve V. The valve switch common terminal 32V is a part of the common terminal 32 connected to the first tap terminal T1. The valve switch conductor 45V can be brought into contact with and separated from the valve switch terminal 35V and the valve switch common terminal 32V. When the valve switch conductor 45V contacts the valve switch terminal 35V and the valve switch common terminal 32V, the first valve switch SV1 is turned on. When the valve switch conductor 45V is separated from the valve switch terminal 35V and the valve switch common terminal 32V, the first valve switch SV1 is opened. The second valve switch SV2 is formed similarly to the first valve switch SV 1.

A first end of a first current limiting resistor R1 is connected to a first tap terminal T1 via a first resistive switch SR 1. A second end of the first current limiting resistor R1 is connected to the neutral terminal 18. A first current limiting resistor R1 is connected in parallel with valve V to a first tap terminal T1. A first end of a second current limiting resistor R2 is connected to a second tap terminal T2 via a second resistive switch SR 2. A second end of the second current limiting resistor R2 is connected to the neutral point terminal 18. A second current limiting resistor R2 is connected in parallel with valve V to a second tap terminal T2.

First resistance switch SR1 has resistance switch terminal 35R, resistance switch common terminal 32R, and resistance switch conductor 55R. Resistive switch terminal 35R is connected to a first end of a first current limiting resistor R1. The resistive switching common terminal 32R is a part of the common terminal 32 connected to the first tap terminal T1. The resistance switch conductor 55R can be brought into contact with and separated from the resistance switch terminal 35R and the resistance switch common terminal 32R. When the resistance switch conductor 55R contacts the resistance switch terminal 35R and the resistance switch common terminal 32R, the first resistance switch SR1 is turned on. When the resistive switch conductor 55R is separated from the resistive switch terminal 35R and the resistive switch common terminal 32R, the first resistive switch SR1 is turned off. The second resistive switch SR2 is formed identically to the first resistive switch SR 1.

A first energizing switch SM1 is connected to first tap terminal T1 in parallel with valve V. A second energizing switch SM2 is connected to the second tap terminal T2 in parallel with valve V.

First energizing switch SM1 has energizing switch terminal 35M, energizing switch common terminal 32M, and energizing switch conductor 45M. The energization switch terminal 35M is connected to the neutral point terminal 18. Energizing switch common terminal 32M is a part of common terminal 32 connected to first tap terminal T1. The current-carrying switch conductor 45M can be brought into contact with and separated from the current-carrying switch terminal 35M and the current-carrying switch common terminal 32M. When current-carrying switch conductor 45M contacts current-carrying switch terminal 35M and current-carrying switch common terminal 32M, first resistance switch SR1 is turned on. When conducting switch conductor 45M is separated from conducting switch terminal 35M and conducting switch common terminal 32M, first resistance switch SR1 is turned off. The second on switch SM2 is formed similarly to the first on switch SM 1.

Fig. 3 is a perspective view of the switching shutter 10 of the embodiment. The switching shutter 10 shown in fig. 3 is disposed inside the cylindrical container 10a shown in fig. 1.

In the present application, the Z direction, R direction, and θ direction of the polar coordinate system are defined as follows. The Z direction is a direction for switching the center axis of the shutter 10. For example, the Z direction is a vertical direction, and the + Z direction is an upward direction. The R direction is a radial direction of the switching shutter 10. The + R direction is a radial outer direction (a direction away from the central axis). The θ direction is a circumferential direction of the central axis of the switching shutter 10. The + θ direction is the direction of rotation of the right-hand thread running in the + Z direction. For example, the R direction and the θ direction are horizontal directions.

The switching shutter 10 has a first mounting plate 12, a second mounting plate 13, and a stay 14.

The first mounting plate 12, the second mounting plate 13, and the support column 14 are made of a conductive metal material and connected to the neutral point terminal 18. The neutral point terminal 18 is connected to the tap selector 2 shown in fig. 1 by a wiring 3. The first mounting plate 12 and the second mounting plate 13 are formed in a disk shape and arranged in parallel in the Z direction. The strut 14 is disposed between the first mounting plate 12 and the second mounting plate 13 and in the-Z direction of the second mounting plate 13.

The switching shutter 10 has an energy accumulating mechanism 15.

The energy storage mechanism 15 is disposed in the-Z direction of the second mounting plate 13. The charging mechanism 15 includes a charging spring 15 s. The drive mechanism 5 shown in fig. 1 performs the expansion or compression (charging operation) of the charging spring 15s shown in fig. 3 in parallel with the selection operation of the tap selector 2. The energy storage mechanism 15 releases the stored energy storage spring 15s after the selection operation of the tap selector 2 is completed. The charging mechanism 15 rotates a shaft 61 of a cam unit 60 (described later) by a predetermined angle by a restoring force (release of charging capability) of a charging spring 15 s. Thereby, the charging mechanism 15 instantaneously performs the switching operation of the switching switch 10.

The switching shutter 10 has a switching unit 20.

The switching unit 20 is disposed between and supported by the first mounting plate 12 and the second mounting plate 13. The switching unit 20 is formed for each phase of the three-phase alternating current. The three-phase switching units 20 are arranged in line in the θ direction. The switching unit 20 has the aforementioned valve V, a first switching combination S1 and a second switching combination S2. The valve V is disposed at the center of the switching unit 20 in the θ direction and is in the + R direction.

The first switch combination S1 includes a first power-on switch SM1, a first valve switch SV1 and a first resistor switch SR1 as shown in fig. 2. The second switch combination S2 includes a second on-switch SM2, a second valve switch SV2 and a second resistor switch SR 2. As shown in fig. 3, the first switch combination S1 and the second switch combination S2 are arranged in the θ direction with the valve V interposed therebetween. The first switch combination S1 is disposed in the-theta direction of the valve V, and the second switch combination S2 is disposed in the + theta direction of the valve V.

The first current limiting resistor R1 and the second current limiting resistor R2 are disposed on opposite sides of the switching unit 20 with the first mounting plate 12 interposed therebetween. A first current limiting resistor R1 and a second current limiting resistor R2 are fixed to the + Z surface of the first mounting plate 12.

Fig. 4 is a perspective view of the switching unit 20 as viewed from the central axis side of the switching shutter 10. The switching unit 20 includes a unit base 21 and a valve opening/closing mechanism 22.

The cell base 21 is formed of an insulating material such as resin. The unit body 21 includes a bottom plate portion 21a and a pillar portion 21 b. The bottom plate portion 21a is formed in an arc shape and fixed to the + Z surface of the second mounting plate 13. The support column portion 21b extends in the + Z direction from the center of the bottom plate portion 21a in the θ direction. The unit base 21 supports the valve V, the first switch combination S1, and the second switch combination S2. The valve V is disposed in the + R direction of the column portion 21 b.

Fig. 5 is a first explanatory diagram of the operation of the valve opening/closing mechanism 22. Fig. 6 is a second explanatory diagram of the operation of the valve opening/closing mechanism 22. Fig. 5 and 6 are RZ cross sections including the central axis of the valve V.

As shown in fig. 5, the valve opening/closing mechanism 22 controls opening and closing of the fixed electrode Va and the movable electrode Vb of the valve V. The valve opening/closing mechanism 22 includes a lever 24 and a valve cam 65.

The rod 24 is formed in an L shape when viewed from the θ direction. The lever 24 is supported to be rotatable around a rotation axis 24 x. The rotation shaft 24x is disposed parallel to the θ direction at the L-shaped bent portion of the lever 24. The lever 24 has a first arm 24a extending from the pivot shaft 24x in the + R direction and a second arm 24b extending from the pivot shaft 24x in the + Z direction. The tip of the first arm 24a in the + R direction is connected to the movable electrode Vb of the valve V. A roller (cam follower) 25 is attached to the + Z direction front end of the second arm 24 b. The roller 25 can rotate around the Z direction.

The valve cam 65 is formed in a substantially disk shape. The valve cam 65 is disposed at the same position as the roller 25 in the Z direction. The valve cam 65 is fixed to the outer periphery of the shaft 61 and is rotatable in the θ direction together with the shaft 61. The shaft 61 and the valve cam 65 are part of the cam unit 60 shown in fig. 11. A first outer circumferential portion 66 and a second outer circumferential portion 67 (see fig. 6) are formed at different positions in the R direction on the outer circumference of the valve cam 65. The first outer peripheral portion 66 is arranged in the-R direction, and the second outer peripheral portion 67 is arranged in the + R direction.

As shown in fig. 6, when the valve cam 65 rotates in the θ direction, the roller 25 is disposed in the + R direction of the second peripheral portion 67. The second peripheral portion 67 presses the roller 25 in the + R direction. The lever 24 is rotated in the direction of arrow 27 to move the movable electrode Vb of the valve V in the-Z direction. Thereby, the movable electrode Vb is separated from the fixed electrode Va, and the valve V is opened.

As shown in fig. 5, when the valve cam 65 rotates in the θ direction, the roller 25 is disposed in the + R direction of the first outer peripheral portion 66. At this time, the valve cam 65 is separated from the roller 25. The fixed electrode Va and the movable electrode Vb of the valve V are biased in the closing direction. The lever 24 is rotated in the direction of arrow 26, and the movable electrode Vb of the valve V moves in the + Z direction. Thereby, the movable electrode Vb comes into contact with the fixed electrode Va, and the valve V is closed.

As shown in fig. 4, the first switch assembly S1 includes the fixed portion 30 and the

movable portions

40 and 50. The second switch combination S2 is formed identically to the first switch combination S1.

The fixing portion 30 is disposed in the + R direction of the switching unit 20 and fixed to the bottom plate portion 21a of the unit base 21. The

movable portions

40 and 50 are disposed in the-R direction of the fixed portion 30. The

movable portions

40 and 50 are supported by the column portion 21b of the unit base 21 via the

parallel links

42 and 52. The

movable portions

40 and 50 are movable in the substantially R direction with respect to the fixed portion 30.

Fig. 7 is a perspective view of the fixed portion of the switch assembly viewed from the-R direction. Fig. 8 is a perspective view of the fixed portion of the switch assembly viewed from the + R direction. The fixing portion 30 has a switch base 31. The first switch combination S1 also has the aforementioned common terminal 32 and a first tap terminal T1. The first switch combination S1 further includes the energization switch terminal 35M, the valve switch terminal 35V, the resistance switch terminal 35R, and the connection unit 38.

The switch base 31 is formed of an insulating material such as resin. The switch base 31 is formed in a rectangular parallelepiped shape with the Z direction as the longitudinal direction.

The common terminal 32 extends in the Z direction. The common terminal 32 is disposed in the- θ direction of the-R surface of the switch base 31. The common terminal 32 is provided with a common terminal 32M for current supply switch and a common terminal 32V for valve switch at the end in the + Z direction. A resistance switch common terminal 32R is formed at an end of the common terminal 32 in the-Z direction. The energizing switch common terminal 32M, the valve switch common terminal 32V, and the resistance switch common terminal 32R are part of the common terminal 32, and are formed integrally with the common terminal. The energization switch common terminal 32M, the valve switch common terminal 32V, and the resistance switch common terminal 32R are formed in a substantially V-shape opened in the-R direction in the RZ cross section.

As shown in fig. 8, first tap terminal T1 is disposed on the + R surface of switch base 31. The first tap terminal T1 is connected to the common terminal 32. The first tap terminal T1 is disposed at the anchor 30 of the first switch assembly S1, and the second tap terminal T2 is disposed at the anchor 30 of the second switch assembly S2. As described above, the first tap terminal T1 and the second tap terminal T2 are connected to the tap selector 2 shown in fig. 1 by the wiring 3.

As shown in fig. 7, the energizing switch terminal 35M, the valve switch terminal 35V, and the resistance switch terminal 35R are disposed in the + θ direction of the-R surface of the switch base 31. The energization switch terminal 35M, the valve switch terminal 35V, and the resistance switch terminal 35R are arranged in line along the common terminal 32 in the Z direction. The energizing switch terminal 35M and the energizing switch common terminal 32M are arranged in line in the θ direction. The valve switch terminal 35V and the valve switch common terminal 32V are arranged in line in the θ direction. The resistance switch terminal 35R and the resistance switch common terminal 32R are arranged in line in the θ direction. The energization switch terminal 35M, the valve switch terminal 35V, and the resistance switch terminal 35R are formed in a substantially V-shape opened in the-R direction in the RZ cross section.

As shown in fig. 8, the connection portion 38 is disposed in the + Z direction of the + R surface of the switch base 31. A first end of the connection portion 38 is connected to the energizing switch terminal 35M. The second end of the connecting portion 38 is connected to the first mounting plate 12 as shown in fig. 3. The valve switch terminal 35V is connected to a terminal (current-carrying terminal) of the movable electrode of the valve V via a wiring 16V. The resistance switch terminal 35R is connected to a first end of the first current limiting resistor R1 by a wiring 16R.

The second end of the first current limiting resistor R1 is connected to the first mounting board 12 by a wiring 17R. The terminals of the fixed pole of the valve V are connected to the first mounting plate 12. As previously described, the first mounting plate 12 is connected to the neutral terminal 18. The neutral point terminal 18 is connected to the tap selector 2 shown in fig. 1 by a wiring 3.

As shown in fig. 4, the

movable portions

40 and 50 of the first switch combination S1 include a first movable portion 40 arranged in the + Z direction and a second movable portion 50 arranged in the-Z direction.

Fig. 9 is a perspective view of the first movable portion 40. The first movable portion 40 includes a frame 41, a parallel link 42, a first roller (cam follower) 43, a second roller (cam follower) 44, an energizing switch conductor 45M, and a valve switch conductor 45V.

The frame 41 is formed of a steel plate material or the like after press working. The frame 41 extends in the R direction. The frame 41 has a conductor support portion 41a arranged in the + R direction, a center portion 41b arranged at the center in the R direction, and a roller support portion 41c arranged in the-R direction. The conductor support portion 41a is formed in a substantially U shape that opens in the + R direction when viewed from the Z direction. The center portion 41b and the roller support portion 41c are formed by a pair of plates extending in the-R direction from the ± Z-direction ends of the conductor support portion 41 a.

The parallel link 42 has a pair of link members. The first end of the parallel link 42 is connected to the central portion 41b of the frame 41 of the first movable portion 40. The second end of the parallel link 42 is connected to the pillar portion 21b of the unit base 21, as shown in fig. 4. Thus, the first movable portion 40 can move in the substantially R direction while maintaining the posture parallel to the R direction. The current-carrying switch conductor 45M is simultaneously brought into contact with and separated from the current-carrying switch common terminal 32M and the current-carrying switch terminal 35M. The valve switch conductor 45V is simultaneously brought into contact with and separated from the valve switch common terminal 32V and the valve switch terminal 35V.

The first roller 43 and the second roller 44 are supported by a roller support portion 41c of the frame 41. The first roller 43 is disposed between a pair of plates, and the second roller 44 is disposed in the-Z direction of the pair of plates. The first roller 43 and the second roller 44 are rotatable around the Z direction.

The current-carrying switch conductor 45M and the valve switch conductor 45V are formed in a columnar shape. The current-carrying switch conductor 45M and the valve switch conductor 45V are supported by the conductor support portion 41a of the frame 41.

Openings

47M and 47V are formed in the side wall of the conductor support portion 41a in the θ direction. The center axis of the current-carrying switch conductor 45M is inserted through the opening 47M, and the center axis of the valve switch conductor 45V is inserted through the opening 47V. The current-carrying switch spring 46M is disposed between the side wall of the conductor support portion 41a in the-R direction and the current-carrying switch conductor 45M. The energization switch spring 46M biases the energization switch conductor 45M in the + R direction. A valve opening/closing spring 46V is disposed between the side wall of the conductor support portion 41a in the-R direction and the valve opening/closing conductor 45V. The valve switch spring 46V biases the valve switch conductor 45V in the + R direction.

The length of the opening 47V in the R direction is longer than the opening 47M. The valve opening/closing spring 46V has a longer length in the R direction than the energizing opening/closing spring 46M. Thus, the valve switch conductor 45V is disposed in the + R direction with respect to the energization switch conductor 45M. The distances from the current-carrying switch common terminal 32M and the current-carrying switch terminal 35M to the current-carrying switch conductor in the state where the first current-carrying switch SM1 is off are set as a first distance. The second distance is the distance from the common valve switch terminal 32V and the common valve switch terminal 35V to the valve switch conductor 45V in the state where the first valve switch SV1 is open. The conductor support portion 41a of the frame 41 of the first movable portion 40 supports the current-carrying switch conductor 45M and the valve switch conductor 45V such that the second distance is longer than the first distance. By changing the position of the first movable section 40 in the R direction, various combinations of on and off of the first energizing switch SM1 and the first valve switch SV1 are realized.

Fig. 11 is a perspective view of the cam unit 60. In fig. 11, only the switching unit 20 of one phase is illustrated, except for the cam unit 60. The cam unit 60 is disposed along the central axis of the switching shutter 10. The switching unit 20 is disposed in the + R direction of the cam unit 60. One cam unit 60 performs the switching operation of the three-phase switching unit 20. The cam unit 60 includes a shaft 61, a first cam 70 disposed in the + Z direction, a valve cam 65 disposed at the center in the Z direction, and a second cam unit 80u disposed in the-Z direction. The first cam 70 moves the first movable portion 40. The valve cam 65 operates the valve opening/closing mechanism 22 as described above. The second cam unit 80u moves the second movable portion 50.

Fig. 12 is a first explanatory view of the operation of the

movable portions

40 and 50. Fig. 13 is a second explanatory view, fig. 14 is a third explanatory view, fig. 15 is a fourth explanatory view, and fig. 16 is a fifth explanatory view. Fig. 12 to 16 are RZ cross-sectional views through switch combinations.

The shaft 61 is arranged along the central axis of the switching shutter 10. As shown in fig. 12, the shaft 61 is supported by the first mounting plate 12 via a bearing 62 and by the second mounting plate 13 via a bearing 63. The shaft 61 is rotatably supported by the first mounting plate 12 and the second mounting plate 13. The shaft 61 is driven in rotation by the energy storage means 15 shown in fig. 3.

As shown in fig. 12, the first cam 70 is fixed to the outer periphery of the shaft 61. The first cam 70 is rotatable in the θ direction together with the shaft 61. A first groove portion 70a is formed at an end portion in the-Z direction of the outer periphery 73 of the first cam 70. The first groove portion 70a is formed along the outer periphery 73 of the first cam 70 over the entire periphery of the first cam 70. The first groove portion 70a opens in the + Z direction. The second roller 44 of the first movable portion 40 is accommodated in the first groove portion 70 a. The second roller 44 abuts on the-R surface of the side wall 74 of the first groove portion 70 a. The first roller 43 of the first movable portion 40 abuts on the outer periphery (+ R surface) 73 of the first cam 70. Thereby, the position of the first movable portion 40 in the R direction is regulated.

As shown in fig. 11, a first outer peripheral portion 76, a second outer peripheral portion 77, and a third outer peripheral portion 78 that are different in position in the R direction are formed on the outer periphery 73 of the first cam 70. Of these, the first outer peripheral portion 76 is disposed in the most-R direction, and the third outer peripheral portion 78 is disposed in the most + R direction. The second outer peripheral portion 77 is disposed in the R direction between the first outer peripheral portion 76 and the third outer peripheral portion 78.

As shown in fig. 12, when the first cam 70 rotates in the θ direction, the first movable portion 40 is adjacently disposed in the + R direction of the first outer peripheral portion 76. At this time, the first movable portion 40 is disposed at the end in the-R direction in the movable range in the R direction. Thereby, the current-carrying switch conductor 45M is separated from the common terminal 32 and the current-carrying switch terminal 35M, and the first current-carrying switch SM1 is turned off. The valve switch conductor 45V is separated from the common terminal 32 and the valve switch terminal 35V, and the first valve switch SV1 is open.

As shown in fig. 14, when the first cam 70 rotates in the θ direction, the first movable portion 40 is adjacently disposed in the + R direction of the third outer peripheral portion 78. At this time, the first movable portion 40 is disposed at the end in the + R direction in the movable range in the R direction. Thereby, the current-carrying switch conductor 45M comes into contact with the common terminal 32 and the current-carrying switch terminal 35M, and the first current-carrying switch SM1 is turned on. The valve switch conductor 45V contacts the common terminal 32 and the valve switch terminal 35V, and the first valve switch SV1 is turned on.

As shown in fig. 13, when the first cam 70 rotates in the θ direction, the first movable portion 40 is adjacently disposed in the + R direction of the second peripheral portion 77. At this time, the first movable portion 40 is disposed in the middle of the movable range in the R direction. As described above, the valve switch conductor 45V is disposed in the + R direction with respect to the energization switch conductor 45M. Therefore, the valve switch conductor 45V contacts the common terminal 32 and the valve switch terminal 35V, and the first valve switch SV1 is turned on. On the other hand, the current-carrying switch conductor 45M is separated from the common terminal 32 and the current-carrying switch terminal 35M, and the first current-carrying switch SM1 is turned off.

Fig. 17 is an explanatory diagram of the first connecting rod 140. The first connection bar 140 is formed of a conductive material. The first connecting rod 140 is formed in a substantially L shape when viewed from the θ direction. The first connecting rod 140 is disposed in the-R direction of the conductor support portion 41a of the first movable portion 40. The first connecting rod 140 is supported to be rotatable relative to the first mounting plate 12. A first connection spring 144 is disposed between the first connection rod 140 and the first mounting plate 12.

As described above, when the first movable section 40 moves in the-R direction, the first energizing switch SM1 and the first valve switch SV1 are turned off. At this time, the conductor support portion 41a of the first movable portion 40 abuts against the first connecting rod 140. The first movable portion 40 is conductively connected to the first mounting plate 12 via a first connecting rod 140. Thus, the first movable portion 40 has the same potential as the neutral point terminal 18, and is stable in potential.

Fig. 10 is a perspective view of the second movable portion 50. The second movable portion 50 is formed similarly to the first movable portion 40. The second movable portion 50 includes a frame 51, a parallel link 52, a first roller (cam follower) 53, a second roller (cam follower) 54, and a resistance switch conductor 55R.

The frame 51 includes a conductor support portion 51a, a center portion 51b, and a roller support portion 51 c.

The first end portions of the parallel links 52 are connected to the central portion 51b of the frame 51. The second end of the parallel link 52 is connected to the pillar portion 21b of the unit base 21, as shown in fig. 4. Thus, the resistance switch conductor 55R simultaneously contacts and separates from the resistance switch common terminal 32R and the resistance switch terminal 35R.

The resistance switch conductor 55R is formed in a cylindrical shape. The resistance switch conductor 55R is supported by the conductor support portion 51a of the frame 51. An opening 57R is formed in a sidewall of the conductor support portion 51a in the θ direction. The center axis of the resistance switch conductor 55R is inserted into the opening 57R. A resistance switch spring 56R is disposed between the side wall of the conductor support portion 51a in the-R direction and the resistance switch conductor 55R. The resistance switch spring 56R biases the resistance switch conductor 55R in the + R direction.

As shown in fig. 11, the cam unit 60 has a second cam unit 80 u. The second cam unit 80u moves the second movable portion 50. The second cam unit 80u has a second cam 80 and a second cam rotation control mechanism 90.

As shown in fig. 15, the second cam 80 is supported by the shaft 61 via a bearing 82. The second cam 80 is rotatable in the θ direction independently of the shaft 61. A second groove portion 80a is formed at an end portion in the-Z direction of the outer periphery 83 of the second cam 80. The second groove portion 80a is formed along the outer periphery 83 of the second cam 80 over the entire periphery of the second cam 80. The second groove portion 80a opens in the + Z direction. The second roller 54 of the second movable portion 50 is accommodated in the second groove portion 80 a. The second roller 54 abuts on the-R surface of the side wall 84 of the second groove portion 80 a. The first roller 53 of the second movable portion 50 abuts on the outer periphery (+ R surface) 83 of the second cam 80. Thereby, the position of the second movable portion 50 in the R direction is regulated.

As shown in fig. 11, a first outer circumferential portion 86 and a second outer circumferential portion 87 are formed at different positions in the R direction on the outer circumference 83 of the second cam 80. The first outer peripheral portion 86 is disposed in the-R direction, and the second outer peripheral portion 87 is disposed in the + R direction.

As shown in fig. 15, when the second cam 80 rotates in the θ direction, the second movable portion 50 is adjacently disposed in the + R direction of the first outer peripheral portion 86. At this time, the second movable portion 50 is disposed at the end in the-R direction in the movable range in the R direction. As a result, the resistance switch conductor 55R is separated from the common terminal 32 and the resistance switch terminal 35R, and the first resistance switch SR1 is turned off.

As shown in fig. 14, when the second cam 80 rotates in the θ direction, the second movable portion 50 is adjacently disposed in the + R direction of the second peripheral portion 87. At this time, the second movable portion 50 is disposed at the end in the + R direction in the movable range in the R direction. As a result, the resistance switch conductor 55R comes into contact with the common terminal 32 and the resistance switch terminal 35R, and the first resistance switch SR1 is turned on.

Fig. 18 is an explanatory view of the second connecting rod 150. The second connection bar 150 is formed of a conductive material. The second link 150 is formed in a substantially L shape when viewed from the θ direction. The second tie bar 150 is disposed in the-R direction of the conductor support portion 51a of the second movable portion 50. The second connecting rod 150 is supported to be rotatable with respect to the second mounting plate 13. A second link spring 154 is disposed between the second link 150 and the second mounting plate 13.

As described above, when the second movable portion 50 moves in the-R direction, the first resistance switch SR1 is turned off. At this time, the conductor support portion 51a of the second movable portion 50 abuts on the second link 150. The second movable portion 50 is conductively connected to the first mounting plate 12 via a second connection rod 150. Thereby, the second movable portion 50 has the same potential as the neutral point terminal 18, and is stable in potential.

As shown in fig. 11, the second cam unit 80u has a second cam rotation control mechanism 90. The second cam rotation control mechanism 90 is disposed in the-Z direction of the second cam 80. The second cam rotation control mechanism 90 controls the rotation of the second cam 80.

Fig. 19 is a perspective view of the second cam rotation control mechanism 90. The second cam rotation control mechanism 90 has a base 91, a pusher 95, and a stopper 130.

The base 91 has a circular portion 92 and an arm portion 93. The annular portion 92 is disposed on the outer periphery of the shaft 61 and fixed to the shaft 61.

The arm portion 93 extends in the + R direction from the outer periphery of the annular portion 92. The pair of

arm portions

93a and 93b are disposed with the shaft 61 interposed therebetween. The pair of

arm portions

93a and 93b are a first arm portion 93a and a second arm portion 93 b. Here, a first virtual plane (not shown) is defined that includes the central axis of the shaft 61 and intersects both the pair of

arm portions

93a and 93 b. A second virtual plane (not shown) is defined that includes the central axis of the shaft 61 and is orthogonal to the first virtual plane. The pair of arm portions 93 is plane-symmetrical with respect to the second virtual plane. With respect to the first virtual plane, the side where the pusher 95 is disposed is referred to as a pusher side, and the side where the stopper 130 is disposed is referred to as a stopper side. The pair of

arm portions

93a and 93b extend from the annular portion 92 in the + R direction, and further extend while curving toward the pusher side, and are connected to each other. A base opening 91h is formed between the pair of

arm portions

93a and 93b and the annular portion 92 that are coupled. A base inclined portion 99 abutting on the stopper 130 is formed on the stopper side of the arm portion 93.

The pusher 95 is disposed in the vicinity of a position where the arm 93 bends toward the pusher. The pair of

pushers

95a and 95b are disposed corresponding to the pair of

arm portions

93a and 93 b. The pair of

pushers

95a, 95b is a first pusher 95a and a second pusher 95 b. The pair of

pushers

95a and 95b are plane-symmetric with respect to the second virtual plane. The pusher 95 is supported to be rotatable with respect to the arm 93. The rotating shaft 95x of the pusher 95 is disposed near the center of the pusher 95 in the longitudinal direction. The pusher 95 is configured to cross the arm portion 93. A first roller 96 is attached to a first end of the pusher 95 disposed inside the base opening 91 h. A second roller 97 is disposed at a second end of the pusher 95 disposed outside the base opening 91 h. The first roller 96 and the second roller 97 are rotatable around the Z direction. A compressed pusher spring 94 is disposed between the pusher 95 and the arm portion 93. The pusher spring 94 abuts against the pusher 95 between the rotation shaft 95x of the pusher 95 and the second roller 97. The first roller 96 is urged toward the circular portion 92 by the pusher spring 94.

The pusher guide 13g is disposed on the + Z surface of the second mounting plate 13. The pusher guide 13g is formed in an arc shape. The pusher guide 13g is disposed on the pusher side of the base 91 and is the + R direction of the pusher 95. The second roller 97 of the pusher 95 can abut against the side surface of the pusher guide 13g in the-R direction. A third virtual plane (not shown) is defined that includes the center axis of the valve V of one of the three phases of the three-phase alternating current and the center axis of the shaft 61. The pusher guide 13g is formed to be plane-symmetrical with the third virtual plane as a symmetrical plane.

The aforementioned second cam 80 has a first protrusion 181. The first protrusion 181 protrudes from the second cam 80 in the-Z direction. Fig. 19 shows a front end portion of the first protrusion 181 in the-Z direction. The first projection 181 is formed in an arc shape along the outer periphery of the annular portion 92 of the base 91. The first protrusion 181 is disposed inside the base opening 91 h. The width of the first protrusion 181 in the θ direction is smaller than the width of the base opening 91h in the θ direction. The first pusher 95a is disposed in the- θ direction of the first protrusion 181, and the second pusher 95b is disposed in the + θ direction of the first protrusion 181. The first roller 96 of the pusher 95 can abut against the side surface of the first protrusion 181 in the θ direction.

The aforementioned second cam 80 has a second projection 182. The second projection 182 projects from the second cam 80 in the-Z direction. Fig. 19 shows the-Z-direction front end of the second projection 182. The second projection 182 is disposed on the stopper side of the annular portion 92 of the base 91. The second projection 182 is formed in an arc shape centering on the central axis of the shaft 61.

The aforementioned second cam 80 has a third projection 183. The third projection 183 projects from the second projection 182 in the-Z direction. The third projection 183 is formed in an arc shape centered on the central axis of the shaft 61. The third protrusion 183 has a smaller width in the θ direction than the second protrusion 182.

The aforementioned second mounting plate 13 has a mounting plate opening 13 h. The mounting plate opening 13h receives the third projection 183 of the second cam 80. The width of the mounting plate opening 13h in the θ direction is larger than the third projection 183. The side surface of the third projection 183 in the θ direction can abut against the inner surface of the attachment plate opening 13h in the θ direction.

The stopper 130 is disposed on the stopper side of the base 91. The pair of

stoppers

130a and 130b are disposed in the θ direction with the second protrusion 182 interposed therebetween. The pair of

stoppers

130a and 130b are a first stopper 130a and a second stopper 130 b. The first stopper 130a is disposed in the + θ direction of the second protrusion 182, and the second stopper 130b is disposed in the- θ direction of the second protrusion 182. The pair of

stoppers

130a and 130b are formed to have plane symmetry with the third virtual plane as a symmetry plane. The stopper 130 is supported by the second mounting plate 13. The stopper 130 is rotatable around the rotation axis 130x in the Z direction. The rotation shaft 130x is disposed at an end of the stopper 130 opposite to the second protrusion 182. The first locking portion 131 and the second locking portion 132 are formed on the side surface of the stopper 130 on the second projection 182 side. The first locking portion 131 is disposed in the-R direction, and the second locking portion 132 is disposed in the + R direction. The first locking portion 131 and the second locking portion 132 can be in contact with the side surface of the second protrusion 182 in the θ direction. The second locking portion 132 is disposed in the vicinity of the second projection 182 with respect to the first locking portion 131 in the θ direction. A stopper spring 133 is disposed at an end of the stopper 130 in the + R direction. The stopper spring 133 biases the pair of

stoppers

130a and 130b to approach each other in the θ direction. A stopper inclined portion 139 that abuts the base portion 91 is formed on the side surface of the stopper 130 in the-R direction.

The switching operation (sequence) of the switching shutter 10 will be described. As described above, the shaft 61 rotates by the release of the energy storage capacity of the energy storage spring 15s (see fig. 3), and the switching operation of the switching shutter 10 is instantaneously performed.

Fig. 20 is a timing chart of the switching operation of the switching shutter 10. In each graph of fig. 20, the upper side is in an ON (ON) state, and the lower side is in an OFF (OFF) state. Fig. 21 is an explanatory diagram of a change in the energization state in the switching operation from the first tap terminal T1 to the second tap terminal T2. Fig. 22 is an explanatory diagram of a change in the energization state in the reverse switching operation from the second tap terminal to the first tap terminal.

The switching operation from the first tap terminal T1 to the second tap terminal T2 will be described. In this switching operation, the shaft 61 is rotated by a predetermined angle in the + θ direction.

Fig. 23 is an explanatory diagram of the operation of the first movable portion 40 at time a. Fig. 23 is a cross-sectional view perpendicular to the Z direction of the portion immediately above the first cam 70. At time a shown in fig. 20 and 21, the first cam 70 is arranged in the state of fig. 23. The first movable portion 40 of the first switch combination S1 is adjacently disposed in the + R direction of the third outer peripheral portion 78 of the first cam 70. The first movable portion 40 of the first switch combination S1 is disposed at the end in the + R direction in the movable range in the R direction. In the first switch combination S1, as shown in fig. 14, the first power-on switch SM1 is turned on, and the first valve switch is turned on. On the other hand, the first movable portion 40 of the second switch combination S2 is adjacently disposed in the + R direction of the first outer peripheral portion 76 of the first cam 70. The first movable portion 40 of the second switch combination S2 is disposed at the end in the-R direction in the movable range in the R direction. In the second switch combination S2, as shown in fig. 15, the second on-switch SM2 is turned off, and the second valve switch SV2 is turned off.

Fig. 24 is an explanatory diagram of the operation of the valve opening/closing mechanism 22 at time a. Fig. 24 is a cross-sectional view perpendicular to the Z direction of the portion immediately above the valve cam 65. At time a, the valve cam 65 is arranged in the state of fig. 24. The first outer peripheral portion 66 of the valve cam 65 is separated from the roller 25 of the valve opening/closing mechanism 22 in the-R direction. Thereby, the valve V is turned on as shown in fig. 5.

Fig. 26 is a first operation explanatory diagram of the second cam rotation control mechanism 90 at time a. Fig. 26 is a cross-sectional view perpendicular to the Z direction of the portion immediately above the second cam rotation control mechanism 90. At time a, the base 91 is arranged in the state of fig. 26. The first projection 181 of the second cam 80 abuts on the side surface of the second arm portion 93b of the base portion 91 in the- θ direction. The first roller 96 of the first pusher 95a abuts against the side surface of the first protrusion 181 in the- θ direction. On the other hand, the base inclined portion 99 of the first arm portion 93a of the base 91 abuts on the stopper inclined portion 139 of the first stopper 130 a. Thereby, the first stopper 130a rotates in the + θ direction. The second locking portion 132 of the first stopper 130a is disengaged from the + θ direction side surface of the second projection 182 of the second cam 80 in the + R direction. Thereby, the second cam 80 is rotatable in the + θ direction.

Fig. 27 is a second operation explanatory diagram of the second cam rotation control mechanism 90 at time a. Fig. 27 is a cross-sectional view perpendicular to the Z direction of the portion immediately above the third projection 183 of the second cam. The third projection 183 of the second cam 80 is disposed at the end in the + θ direction of the attachment plate opening 13h of the second attachment plate 13.

Fig. 25 is an explanatory diagram of the operation of the second movable portion 50 at time a. Fig. 25 is a cross-sectional view perpendicular to the Z direction of the portion immediately above the second cam 80. At time a, the second cam 80 is arranged in the state of fig. 25. The second movable portion 50 of the first switch combination S1 is disposed adjacent to the second outer peripheral portion 87 of the second cam 80 in the + R direction. The second movable portion 50 of the first switch combination S1 is disposed at the end in the + R direction in the movable range in the R direction. In the first switch combination S1, as shown in fig. 14, the first resistance switch SR1 is turned on. On the other hand, the second movable portion 50 of the second switch combination S2 is adjacently disposed in the + R direction of the first outer peripheral portion 86 of the second cam 80. The second movable portion 50 of the second switch combination S2 is disposed at the end in the-R direction in the movable range in the R direction. In the second switch combination S2, as shown in fig. 15, the second resistance switch SR2 is turned off.

As a result, the valve V is closed at the time a shown in fig. 20 and 21. The first power-on switch SM1 is turned on, the first valve switch SV1 is turned on, and the first resistance switch SR1 is turned on. The second on switch SM2 is open, the second valve switch SV2 is open, and the second resistance switch SR2 is open. Thereby, at the time a shown in fig. 21, the first tap terminal T1 is energized via the first energizing switch SM 1. That is, the first energizing switch SM1 is used for stable energization to the first tap terminal T1.

At time b shown in fig. 20 and 21, the first energizing switch SM1 is turned off. On the other hand, the valve V is opened. Thereby, at time b shown in fig. 21, current is passed to first tap terminal T1 via valve V.

Fig. 28 is an explanatory diagram of the operation of the first movable portion 40 at time C. The first cam 70 rotates in the + θ direction together with the shaft 61 from the time a to the time b and the time C. The first movable portion 40 of the first switch combination S1 is adjacently disposed in the + R direction of the second peripheral portion 77 of the first cam 70. The first movable portion 40 of the first switch combination S1 is disposed in the middle of the movable range in the R direction. In the first switching combination S1, as shown in fig. 16, the first power-on switch SM1 is maintained off, and the first valve switch is maintained on. The state of the second switch combination S2 is the same as at time a shown in fig. 23. In the second switch combination S2, as shown in fig. 12, the second on-switch SM2 is maintained open, and the second valve switch SV2 is maintained open.

Fig. 29 is an explanatory diagram of the operation of the valve opening/closing mechanism 22 at time C. The state of the valve opening/closing mechanism 22 at time C is the same as time a shown in fig. 24. That is, as shown in fig. 6, the valve V remains on.

Fig. 31 is a first operation explanatory diagram of the second cam rotation control mechanism 90 at time C. The base 91 rotates in the + θ direction together with the shaft 61. The first roller 96 of the first pusher 95a supported by the base 91 presses the side surface of the first protrusion 181 of the second cam 80 in the- θ direction in the + θ direction. As described above, the second locking portion 132 of the first stopper 130a is disengaged in the + R direction from the side surface of the second protrusion 182 of the second cam 80 in the + θ direction. The rotation of the second projection 182 in the + θ direction is not restricted by the second locking portion 132. Thereby, the second cam 80 rotates in the + θ direction.

Fig. 32 is a second operation explanatory diagram of the second cam rotation control mechanism 90 at time C. The third projection 183 of the second cam 80 moves to the middle portion in the θ direction of the attachment plate opening 13h of the second attachment plate 13.

Fig. 30 is an explanatory diagram of the operation of the second movable portion 50 at time C. As described above, the second cam 80 rotates in the + θ direction. The second movable portion 50 of the first switch combination S1 is adjacently disposed in the + R direction of the first outer peripheral portion 86 of the second cam 80. The second movable portion 50 of the first switch combination S1 is disposed at the end in the-R direction in the movable range in the R direction. In the first switch combination S1, as shown in fig. 16, the first resistance switch SR1 is changed to off. On the other hand, the second movable portion 50 of the second switch combination S2 is disposed adjacent to the second outer peripheral portion 87 of the second cam 80 in the + R direction. The second movable portion 50 of the second switch combination S2 is disposed at the end in the + R direction in the movable range in the R direction. In the second switch combination S2, as shown in fig. 12, the second resistance switch SR2 is changed to on.

As a result, the valve V is closed at time C shown in fig. 20 and 21. The first energizing switch SM1 is off, the first valve switch SV1 is on, and the first resistance switch SR1 is off. The second on switch SM2 is off, the second valve switch SV2 is off, and the second resistance switch SR2 is on. Thus, at time C shown in fig. 21, current is passed through the valve V and the first valve switch SV1 to the first tap terminal T1, and a circulating current flows through the second current limiting resistor R2. That is, the current is supplied to the second current limiting resistor R2 of the tap changing destination prior to the opening of the valve V in the switching operation (time D).

Fig. 33 is an explanatory diagram of the operation of the first movable portion 40 at time D. The shaft 61 continues to rotate in the + θ direction. The state of the first switch combination S1 is the same as at time C shown in fig. 28. In the first switching combination S1, as shown in fig. 16, the first power-on switch SM1 is maintained off, and the first valve switch is maintained on. On the other hand, the state of the second switch combination S2 is also the same as at time C shown in fig. 28. In the second switch combination S2, as shown in fig. 12, the second on-switch SM2 is maintained open, and the second valve switch SV2 is maintained open.

Fig. 34 is an explanatory diagram of the operation of the valve opening/closing mechanism 22 at time D. The second peripheral portion 67 of the valve cam 65 presses the roller 25 of the valve opening/closing mechanism 22 in the + R direction. Thereby, as shown in fig. 6, the valve V is changed to off.

Fig. 36 is a first operation explanatory diagram of the second cam rotation control mechanism 90 at time D. The base 91 rotates in the + θ direction together with the shaft 61. The second roller 97 of the first pusher 95a supported by the base 91 abuts against the side surface of the pusher guide 13g in the-R direction. The first pusher 95a rotates in the-theta direction. The first roller 96 of the first pusher 95a is disengaged from the side surface of the first protrusion 181 of the second cam 80 in the- θ direction in the + R direction. Thereby, the first protrusion 181 is not pressed by the first pusher 95a, and the rotation of the second cam 80 is stopped. In this way, the second cam 80 rotates by a predetermined angle when the switching operation of the switching shutter 10 is started. The rotational angle of the second cam 80 is smaller than the rotational angle of the shaft 61 in the entire switching action. The second cam 80 is kept in a state where the rotation is stopped until the switching operation is completed.

The second protrusion 182 of the second cam 80 approaches the first catching portion 131 of the first stopper 130 a. The second projection 182 abuts against the first locking portion 131, thereby preventing the second cam 80 from being excessively rotated in the + θ direction. The second stopper 130b is rotated in the + θ direction by the stopper spring 133. The second locking portion 132 of the second stopper 130b abuts against the side surface of the second projection 182 in the- θ direction. Thereby, the rotation in the- θ direction by the reaction of the stop of the second cam 80 is restricted.

Fig. 37 is a second operation explanatory diagram of the second cam rotation control mechanism 90 at time D. The third projection 183 of the second cam 80 approaches the + θ direction side surface of the attachment plate opening 13h of the second attachment plate 13. The third projection 183 abuts against the side surface of the attachment plate opening 13h, thereby preventing the second cam 80 from being excessively rotated in the + θ direction.

Fig. 35 is an explanatory diagram of the operation of the second movable portion 50 at time D. The states of the first switch combination S1 and the second switch combination S2 are the same as the state at time C shown in fig. 30. In the first switch combination S1, as shown in fig. 16, the first resistance switch SR1 remains open. In the second switch combination S2, as shown in fig. 12, the second resistance switch SR2 remains on. In this state, as described above, the rotation of the second cam 80 is stopped.

As a result, at time D shown in fig. 20 and 21, the valve V is opened. The first energizing switch SM1 is off, the first valve switch SV1 is on, and the first resistance switch SR1 is off. The second on switch SM2 is off, the second valve switch SV2 is off, and the second resistance switch SR2 is on. Thus, at time D shown in fig. 21, current is supplied to the second tap terminal T2 via the second current limiting resistor R2.

At time e shown in fig. 20 and 21, the first valve switch SV1 is turned off. At time e shown in fig. 21, the second tap terminal T2 is energized via the second current limiting resistor R2, as at time D.

Fig. 38 is an explanatory diagram of the operation of the first movable portion 40 at time F. The shaft 61 continues to rotate in the + θ direction. The first movable portion 40 of the first switch combination S1 is adjacently disposed in the + R direction of the first outer peripheral portion 76 of the first cam 70. The first movable portion 40 of the first switch combination S1 is disposed at the end in the-R direction in the movable range in the R direction. In the first switch combination S1, as shown in fig. 15, the first power-on switch SM1 is maintained to be off, and the first valve switch is maintained to be off. On the other hand, the first movable portion 40 of the second switch combination S2 is adjacently disposed in the + R direction of the second peripheral portion 77 of the first cam 70. The first movable portion 40 of the second switch combination S2 is disposed in the middle of the movable range in the R direction. In the second switch combination S2, as shown in fig. 13, the second on-switch SM2 is kept off, and the second valve switch SV2 is changed to on.

Fig. 39 is an explanatory diagram of the operation of the valve opening/closing mechanism 22 at time F. The state of the valve opening/closing mechanism 22 at time F is the same as time D shown in fig. 34. That is, as shown in fig. 6, the valve V remains open.

Fig. 40 is a first operation explanatory diagram of the second cam rotation control mechanism 90 at time F. As described previously, the rotation of the second cam 80 is stopped. The base 91 rotates in the + θ direction together with the shaft 61. The first roller 96 of the first pusher 95a supported by the base 91 moves in the + θ direction along the side surface of the first protrusion 181 of the second cam 80 in the + R direction. The first roller 96 of the second pusher 95b also moves in the + θ direction along the + R direction side surface of the first protrusion 181. The side surface of the second arm portion 93b of the base portion 91 in the- θ direction is separated from the side surface of the first protrusion 181 in the + θ direction.

As described previously, the rotation of the second cam 80 is stopped. The state of the third projection 183 of the second cam 80 at time F is the same as that at time D shown in fig. 37.

As described previously, the rotation of the second cam 80 is stopped. The state of the second movable unit 50 in the first switch combination S1 and the second switch combination S2 at time F is the same as at time D shown in fig. 35. In the first switch combination S1, as shown in fig. 15, the first resistance switch SR1 remains open. In the second switch combination S2, as shown in fig. 13, the second resistance switch SR2 remains on.

As a result, at time F shown in fig. 20 and 21, the valve V is opened. The first energizing switch SM1 is open, the first valve switch SV1 is open, and the first resistance switch SR1 is open. The second on switch SM2 is turned off, the second valve switch SV2 is turned on, and the second resistance switch SR2 is turned on. At time F shown in fig. 21, the second tap terminal T2 is energized via the second current limiting resistor R2 as at time e.

At time g shown in fig. 20 and 21, the valve V is changed to off. Thus, at time g shown in fig. 21, current is supplied to the second tap terminal T2 via the valve V and the second valve switch SV 2.

Fig. 41 is an explanatory diagram of the operation of the first movable portion 40 at time H. The rotation of the shaft 61 in the + θ direction is stopped in the state of fig. 41. The state of the first movable portion 40 of the first switch combination S1 at time H is the same as time F shown in fig. 38. In the first switch combination S1, as shown in fig. 15, the first power-on switch SM1 is maintained to be off, and the first valve switch is maintained to be off. On the other hand, the first movable portion 40 of the second switch combination S2 is adjacently disposed in the + R direction of the third outer peripheral portion 78 of the first cam 70. The first movable portion 40 of the second switch combination S2 is disposed at the end in the + R direction in the movable range in the R direction. In the second switch combination S2, as shown in fig. 14, the second on-switch SM2 is turned on, and the second valve switch SV2 is kept on.

Fig. 42 is an explanatory diagram of the operation of the valve opening/closing mechanism 22 at time H. The first outer peripheral portion 66 of the valve cam 65 is separated from the roller 25 of the valve opening/closing mechanism 22 in the-R direction. Thereby, the valve V is turned on as shown in fig. 5.

Fig. 43 is a first operation explanatory diagram of the second cam rotation control mechanism 90 at time H. As described previously, the rotation of the second cam 80 is stopped. The rotation of the base 91 in the + θ direction is stopped in the state of fig. 43. The side surface of the first arm portion 93a of the base portion 91 in the + θ direction abuts the side surface of the first projection 181 of the second cam 80 in the- θ direction. The second roller 97 of the second pusher 95b is disengaged from the-R-direction side of the pusher guide 13 g. The second pusher 95b is rotated in the-theta direction by the pusher spring 94. The first roller 96 of the second pusher 95b moves in the-R direction and abuts against the side surface of the first projection 181 of the second cam 80 in the + θ direction.

The base inclined portion 99 of the second arm portion 93b of the base portion 91 abuts on the stopper inclined portion 139 of the second stopper 130 b. The second stopper 130b rotates in the-theta direction. The second locking portion 132 of the second stopper 130b is disengaged from the side surface of the second protrusion 182 of the second cam 80 in the- θ direction in the + R direction. Thereby, the second cam is rotatable in the- θ direction.

As described previously, the rotation of the second cam 80 is stopped. The state of the third projection 183 of the second cam 80 at time H is the same as at time F, and is the same as at time D shown in fig. 37.

As described previously, the rotation of the second cam 80 is stopped. The states of the second movable unit 50 in the first switch combination S1 and the second switch combination S2 at time H are the same as at time F, and are the same as at time D shown in fig. 35. In the first switch combination S1, as shown in fig. 15, the first resistance switch SR1 remains open. In the second switch combination S2, as shown in fig. 14, the second resistance switch SR2 remains on.

As a result, the valve V is closed at the time H shown in fig. 20 and 21. The first energizing switch SM1 is open, the first valve switch SV1 is open, and the first resistance switch SR1 is open. The second on switch SM2 is turned on, the second valve switch SV2 is turned on, and the second resistance switch SR2 is turned on. Thereby, at time H shown in fig. 21, current is supplied to the second tap terminal T2 via the second current-supply switch SM 2. That is, the second energization switch SM2 is used for stable energization to the second tap terminal T2.

With the above, the switching operation from the first tap terminal T1 to the second tap terminal T2 is completed.

The reverse switching operation from the second tap terminal T2 to the first tap terminal T1 will be described. In this reverse switching operation, the shaft 61 is rotated by a predetermined angle in the- θ direction.

At time p shown in fig. 20 and 22, the second energizing switch SM2 is turned off. Thus, at time p shown in fig. 22, current is supplied to the second tap terminal T2 via the valve V and the second valve switch SV 2.

Fig. 44 is an explanatory diagram of the operation of the first movable portion 40 at time Q. The first cam 70 rotates in the- θ direction together with the shaft 61. The state of the first movable portion 40 of the first switching combination S1 at time Q is the same as at time H shown in fig. 41. In the first switching combination S1, as shown in fig. 12, the first power-on switch SM1 is maintained to be off, and the first valve switch is maintained to be off. On the other hand, the first movable portion 40 of the second switch combination S2 is adjacently disposed in the + R direction of the second peripheral portion 77 of the first cam 70. The first movable portion 40 of the second switch combination S2 is disposed in the middle of the movable range in the R direction. In the second switch combination S2, as shown in fig. 16, the second on-switch SM2 is turned off, and the second valve switch SV2 is kept on.

Fig. 45 is an explanatory diagram of the operation of the valve opening/closing mechanism 22 at time Q. The valve cam 65 rotates in the- θ direction together with the shaft 61. The state of the valve opening/closing mechanism 22 is the same as the time H shown in fig. 42. That is, as shown in fig. 5, the valve V remains on.

Fig. 47 is an explanatory diagram of the operation of the second cam rotation control mechanism 90 at time Q. The base 91 rotates in the- θ direction together with the shaft 61. The first roller 96 of the second pusher 95b supported by the base 91 presses the side surface of the first protrusion 181 of the second cam 80 in the + θ direction in the- θ direction. As described above, the second locking portion 132 of the second stopper 130b is disengaged from the- θ -direction side surface of the second protrusion 182 of the second cam 80 in the + R direction. The rotation of the second projection 182 in the- θ direction is not restricted by the second locking portion 132. Thereby, the second cam 80 rotates in the- θ direction.

Fig. 48 is a diagram illustrating a first operation of the second cam rotation control mechanism 90 at time Q. The third projection 183 of the second cam 80 moves to the middle portion in the θ direction of the attachment plate opening 13h of the second attachment plate 13.

Fig. 46 is a second operation explanatory diagram of the second movable portion 50 at time Q. As described above, the second cam 80 rotates in the- θ direction. The second movable portion 50 of the first switch combination S1 is disposed adjacent to the second outer peripheral portion 87 of the second cam 80 in the + R direction. The second movable portion 50 of the first switch combination S1 is disposed at the end in the + R direction in the movable range in the R direction. In the first switch combination S1, as shown in fig. 12, the first resistance switch SR1 is changed to on. On the other hand, the second movable portion 50 of the second switch combination S2 is adjacently disposed in the + R direction of the first outer peripheral portion 86 of the second cam 80. The second movable portion 50 of the second switch combination S2 is disposed at the end in the-R direction in the movable range in the R direction. In the second switch combination S2, as shown in fig. 16, the second resistance switch SR2 is changed to off.

As a result, the valve V is closed at the time Q shown in fig. 20 and 22. The first energizing switch SM1 is off, the first valve switch SV1 is off, and the first resistance switch SR1 is on. The second on switch SM2 is off, the second valve switch SV2 is on, and the second resistance switch SR2 is off. At the time Q shown in fig. 22, current is supplied to the second tap terminal T2 via the valve V and the second valve switch SV2, and a circulating current flows in the first current limiting resistor R1. That is, the first current limiting resistor R1 of the tap change destination is energized prior to the opening of the valve V (time R) in the reverse switching operation.

At time r shown in fig. 20 and 22, the valve V is changed to off. Thus, at time R shown in fig. 22, current is passed to the first tap terminal T1 via the first current limiting resistor R1 and the first resistance switch SR 1.

At time r, the rotation of the second cam 80 is stopped. In this way, the second cam 80 rotates by a predetermined angle at the start of the reverse switching operation. The rotational angle of the second cam 80 is smaller than the rotational angle of the shaft 61 in the entire reverse switching action. The second cam 80 is kept in a state where the rotation is stopped until the reverse switching operation is finished.

The state of the switching shutter 10 at time s shown in fig. 20 and 22 is the same as time F shown in fig. 38 to 40. At time s, the second valve switch SV2 changes to off. At time s shown in fig. 22, the first tap terminal T1 is energized via the first current limiting resistor R1 and the first resistance switch SR1, as at time R.

At time t shown in fig. 20 and 22, the first valve switch SV1 is turned on. At time T shown in fig. 22, the first tap terminal T1 is energized via the first current limiting resistor R1 and the first resistance switch SR1 as at time s.

The state of the switching shutter 10 at time u shown in fig. 20 and 22 is the same as time D shown in fig. 33 to 37. At time u, the valve V is changed to on. At time u shown in fig. 22, current is supplied to the first tap terminal T1 via the valve V and the first valve switch SV 1.

The state of the switching shutter 10 at time u shown in fig. 20 and 22 is the same as time D shown in fig. 33 to 43. At time u, the valve V is changed to on. At time u shown in fig. 22, current is supplied to the first tap terminal T1 via the valve V and the first valve switch SV 1.

The state of the switching shutter 10 at time v shown in fig. 20 is the same as at time a shown in fig. 23 to 27. At time v, the first energizing switch SM1 changes to on. At time v, the first tap terminal T1 is energized via the first energizing switch SM1, as at time a shown in fig. 21. That is, the first energizing switch SM1 is used for stable energization to the first tap terminal T1.

By the above, the reverse switching operation from the first tap terminal T1 to the second tap terminal T2 is completed.

As described above in detail, the switching shutter 10 of the load-time tap changer 1 of the embodiment has the first tap terminal T1 and the second tap terminal T2, the valve V, the first current limiting resistor R1, and the second current limiting resistor R2. The first tap terminal T1 and the second tap terminal T2 are connected to the tap selector 2 of the load time tap changer 1. The valve V is connected to a first tap terminal T1 via a first valve switch SV1 and to a second tap terminal T2 via a second valve switch SV 2. A first current limiting resistor R1 is connected to the first tap terminal T1 via a first resistive switch SR1 and is connected to the first tap terminal T1 in parallel with the valve V. A second current limiting resistor R2 is connected to the second tap terminal T2 via a second resistive switch SR2 and is connected to the second tap terminal T2 in parallel with the valve V.

The first current limiting resistor R1 and the second current limiting resistor R2 are alternately energized at each tap change. Even in the case of continuous switching in which the cutoff is repeated at intervals of about 5 seconds, the interval of energization of the current limiting resistors R1, R2 can be secured. Thus, heat generation of the current limiting resistors R1, R2 is suppressed. The durability of the current limiting resistors R1 and R2 is improved, and the maintenance period is prolonged. Accordingly, small and inexpensive current limiting resistors R1 and R2 can be used without reducing the step size.

That is, according to the switching switch of the load tap changer described in the present embodiment, it is possible to alleviate the size increase, cost increase, or limitation of the step capacity (rated current × step voltage) of the current limiting resistor for suppressing the temperature increase of the current limiting resistor due to continuous switching for repeated cutting at intervals of several seconds (for example, at intervals of 5 seconds) to a certain standard value or less.

Since the respective resistance switches are set for the respective current limiting resistors, the switching stroke becomes short. This increases the degree of freedom in setting the opening/closing timing, and increases the tolerance to variations in the opening/closing timing. Further, since the switching shutter 10 is small, the switching operation is realized by releasing the storage capacity without utilizing the storage operation of the storage mechanism.

The switching switch 10 has a first energizing switch SM1 and a second energizing switch SM 2. A first energizing switch SM1 is connected to first tap terminal T1 in parallel with valve V. A second energizing switch SM2 is connected to the second tap terminal T2 in parallel with valve V.

The first energization switch SM1 and the second energization switch SM2 are used for stable energization. This enables the valve terminal having a small current carrying capacity to be used. The impact force when the valve is opened and closed is suppressed by the decrease in the mass of the valve terminal. In addition, the wiring connection structure to the valve V is simplified.

The switching switch 10 includes a first switch group S1, a second switch group S2, a valve opening/closing mechanism 22, and a unit base 21. The first switch combination S1 includes a first power-on switch SM1, a first valve switch SV1, and a first resistor switch SR 1. The second switch combination S2 includes a second on-switch SM2, a second valve switch SV2 and a second resistor switch SR 2. The valve opening/closing mechanism 22 opens and closes the valve V. The unit base 21 supports a valve V, a valve opening/closing mechanism 22, a first switch group S1, and a second switch group S2, which constitute a switching open/close circuit of the same phase in three-phase alternating current. The cell base 21 is formed of an insulating material. The unit base 21 supports the first switch combination S1 on the first side and the second switch combination S2 on the second side with the valve V and the valve opening/closing mechanism 22 therebetween.

This facilitates assembly of the switching shutter 10. In addition, the switching shutter 10 is miniaturized.

First energizing switch SM1 has common terminal 32, energizing switch terminal 35M, and energizing switch conductor 45M. The common terminal 32 is connected to the first tap terminal T1. The energization switch terminal 35M is connected to the neutral point terminal 18. The current-carrying switch conductor 45M can be brought into contact with and separated from the common terminal 32 and the current-carrying switch terminal 35M. The first valve switch SV1 has the common terminal 32, the valve switch terminal 35V, and the valve switch conductor 45V. The valve switch terminal 35V is connected to the valve V. The valve switch conductor 45V can be brought into contact with and separated from the common terminal 32 and the valve switch terminal 35V. First resistive switch SR1 has common terminal 32, resistive switch terminal 35R, and resistive switch conductor 55R. Resistive switch terminal 35R is connected to a first current limiting resistor R1. The resistance switch conductor 55R can be brought into contact with and separated from the common terminal 32 and the resistance switch terminal 35R. The first switch assembly S1 has a fixing portion 30 fixed to the unit base 21. The fixing portion 30 includes a common terminal 32, a current-carrying switch terminal 35M arranged along the common terminal 32, a valve switch terminal 35V, and a resistance switch terminal 35R.

Each switch is formed by bringing each switch conductor into contact with and separating from each switch terminal arranged in line in the fixing portion 30. Thereby, the first switch combination S1 is miniaturized.

The first switch combination S1 includes

movable portions

40 and 50. The

movable portions

40 and 50 are supported by the unit base 21 via

parallel links

42 and 52 and are movable relative to the fixed portion 30. The

movable portions

40 and 50 support the current-carrying switch conductor 45M via the current-carrying switch spring 46M. The

movable portions

40 and 50 support the valve opening/closing conductor 45V via the valve opening/closing spring 46V. The

movable portions

40 and 50 support the resistance switch conductor 55R via the resistance switch spring 56R.

The

movable portions

40 and 50 are moved in parallel by the

parallel links

42 and 52. Therefore, the contact and separation operations of the switch conductors with respect to the switch terminals are stabilized.

The

movable portions

40 and 50 have a first movable portion 40. The first movable portion 40 supports the current-carrying switch conductor 45M and the valve switch conductor 45V. The first movable portion 40 supports the current-carrying switch conductor 45M and the valve switch conductor 45V so that the first distance and the second distance are different. The first distance is a distance from the common terminal 32 and the energization switch terminal 35M to the energization switch conductor 45M in a state where the first energization switch SM1 is turned off. The second distance is a distance from the common terminal 32 and the valve switch terminal 35V to the valve switch conductor 45V in a state where the first valve switch SV1 is open.

By changing the position of one first movable portion 40, various combinations of on and off of the energizing switch and the valve switch are realized. Therefore, even when the energizing switch is provided, the cost of switching the switch 10 can be suppressed.

The

movable portions

40 and 50 have a second movable portion 50. The second movable portion 50 supports the resistance switch conductor 55R. The switching shutter 10 has a first cam 70, a second cam 80, and a second cam rotation control mechanism 90. The first cam 70 moves the first movable portion 40 relative to the fixed portion 30. The second cam 80 moves the second movable portion 50 relative to the fixed portion 30. The second cam rotation control mechanism 90 controls the rotation of the second cam 80. The second cam rotation control means 90 rotates the second cam 80 by a predetermined angle to move the second movable portion 50 when the switching operation of the switching shutter 10 is started. Thereafter, the second cam rotation control means 90 keeps the second cam 80 in a rotation stopped state until the switching operation is completed.

When the switching operation is started, the second movable portion 50 moves, and the resistance switch is turned on or off. Thus, the current limiting resistor of the tap switching destination is energized prior to the opening of the valve V in the switching operation. Thereafter, the second cam 80 is kept in a state where the rotation is stopped until the switching operation is finished. Therefore, when the reverse switching operation is started, the second movable portion 50 moves in the opposite direction, and the resistance switch is turned off or on. Thus, the current is supplied to the current limiting resistor of the reverse switching destination prior to the opening of the valve V in the reverse switching operation.

The switching switch 10 includes a valve cam 65 and an energy storage mechanism 15. The valve cam 65 operates the valve opening/closing mechanism 22. The energy storage mechanism 15 rotates the first cam 70 and the valve cam 65 by releasing the energy storage capacity, and operates the second cam rotation control mechanism 90.

The switching operation is performed by releasing the energy storage capacity, and the switching operation is not performed in the middle of the previous energy storage operation. Even when the charging operation is stopped in the middle, the switching switch 10 is kept in the previously energized state, and therefore, the recovery operation corresponding to the stage of the switching operation is not required.

That is, according to the switching switch of the tap changer during load described in the present embodiment, there is no need for a recovery mechanism for an unstable operation such as manually returning to an original tap when the stored energy driving is stopped in the middle due to an abnormality of the electric operating mechanism or the like, or for a phase switching of a preceding operation in cooperation with a switching initial operation (stored energy operation) after the switching operation and the switching initial operation after the switching.

The first cam 70 and the second cam 80 are formed of an insulating material.

During the opening of each switch, the conductor of each switch is insulated from the neutral point. In addition, a resistance switch is set for each current limiting resistor. This prevents a no-load short circuit between the two tap terminals of the conductor via the resistance switch. Even when an arc (continuous arc) is generated between the resistance switch conductor and the resistance switch terminal when the resistance switch is turned off due to a transient defect such as the mixing of a foreign substance into the resistance switch gap, the no-load short circuit between the two tap terminals can be prevented. Thus, the reliability of the switching shutter 10 is improved.

The switching shutter 10 has a first link 140 and a second link 150. The first connecting rod 140 connects the first movable portion 40 to the neutral point terminal 18 in a state where the first energizing switch SM1 and the first valve switch SV1 are off. The second connection rod 150 connects the second movable portion 50 to the neutral point terminal 18 in a state where the first resistance switch SR1 is off.

Since each switch becomes a neutral point potential in an off state, instability in potential can be suppressed.

The load tap changer 1 has the switching switch 10 and the tap selector 2 described above.

The aforementioned switching shutter 10 can suppress heat generation of the current limiting resistor. Therefore, the reliability of the tap changer 1 at the time of loading is improved, and the cost is suppressed.

According to at least one embodiment described above, there is a first current limiting resistor R1 connected in parallel to the valve V and a second current limiting resistor R2 connected in parallel to the valve V. This can suppress heat generation in the current limiting resistor.

While several embodiments of the present 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 other various ways, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications are included in the scope and gist of the invention, and are also included in the scope and equivalents of the invention described in the claims.

Description of the reference numerals

R1 … first current limiting resistor, R2 … second current limiting resistor, S1 … first switch combination, S2 … second switch combination, SM1 … first energizing switch, SM2 … second energizing switch, SR1 … first resistance switch, SR2 … second resistance switch, SV1 … first valve switch, SV2 … second valve switch, T1 … first tap terminal, T2 … second tap terminal, V … valve, 1 … load time tap changer, 2 … tap selector, 10 … switching switch, 15 … energy storage mechanism, 18 … neutral point terminal (neutral point), 21 … unit base, 22 … valve closing mechanism, 30 … fixed part, 32 … common terminal, 35M … energizing switch terminal, 35R … resistance switch terminal, 35V … valve switch terminal, 40V 46 40 … first movable part (movable part), 42 … parallel connecting rod, 45M … energizing conductor, 45V 4624 switch conductor, … M5946 switch energizing spring …, a 46V … valve switch spring, a 50 … second movable part (movable part), a 52 … parallel link, a 55R … resistance switch conductor, a 56R … resistance switch spring, a 65 … valve cam, a 70 … first cam, an 80 … second cam, a 90 … second cam rotation control mechanism, a 140 … first link, and a 150 … second link.

The claims (modification according to treaty clause 19)

(deletion)

(modified) a switching switch of a tap changer under load, having:

a first tap terminal and a second tap terminal connected to a tap selector of a tap changer when the tap selector is in a load state;

a valve connected to the first tap terminal via a first valve switch and connected to the second tap terminal via a second valve switch;

a first current limiting resistor connected to the first tap terminal via a first resistive switch, connected to the first tap terminal in parallel with the valve;

a second current limiting resistor connected to the second tap terminal via a second resistive switch, connected to the second tap terminal in parallel with the valve;

a first energizing switch connected to the first tap terminal in parallel with the valve;

a second energizing switch connected to the second tap terminal in parallel with the valve;

a first switch combination including the first power-on switch, the first valve switch, and the first resistance switch;

a second switch combination comprising the second switch, the second valve switch, and the second resistance switch;

a valve opening/closing mechanism that opens and closes the valve; and

a unit base for supporting the valve, the valve opening/closing mechanism, the first switch combination, and the second switch combination, which constitute a switching open/close circuit of the same phase in three-phase alternating current,

the cell base is formed of an insulating material,

the unit base supports the first switch combination on a first side and the second switch combination on a second side with the valve and the valve opening/closing mechanism interposed therebetween.

4. The switching switch of a tap changer under load of claim 3,

the first current-carrying switch has a common terminal connected to the first tap terminal, a current-carrying switch terminal connected to a neutral point, and a current-carrying switch conductor capable of abutting on and separating from the common terminal and the current-carrying switch terminal,

the first valve switch has the common terminal, a valve switch terminal connected to the valve, and a valve switch conductor capable of abutting against and separating from the common terminal and the valve switch terminal,

the first resistance switch has the common terminal, a resistance switch terminal connected to the first current limiting resistor, and a resistance switch conductor capable of abutting against and separating from the common terminal and the resistance switch terminal,

the first switch assembly has a fixing portion fixed to the unit base,

the fixing portion has the common terminal, the energization switch terminal, the valve switch terminal, and the resistance switch terminal, which are arranged in line along the common terminal.

5. The switching switch of a tap changer under load of claim 4,

the first switch assembly has a movable portion supported by the unit base via parallel links and movable relative to the fixed portion,

the movable portion supports the energizing switch conductor via an energizing switch spring, supports the valve switch conductor via a valve switch spring, and supports the resistance switch conductor via a resistance switch spring.

6. The switching switch of a tap changer under load of claim 5,

the movable portion has a first movable portion that supports the energizing switch conductor and the valve switch conductor,

the first movable portion supports the current-carrying switch conductor and the valve switch conductor so that a first distance from the common terminal and the current-carrying switch terminal to the current-carrying switch conductor in an open state of the first current-carrying switch is different from a second distance from the common terminal and the valve switch terminal to the valve switch conductor in an open state of the first valve switch.

7. The switching switch of a tap changer under load of claim 6,

the movable part has a second movable part supporting the resistance switch conductor,

the switching shutter includes: a first cam that moves the first movable portion relative to the fixed portion; a second cam that moves the second movable portion relative to the fixed portion; and a second cam rotation control mechanism that controls rotation of the second cam,

the second cam rotation control means rotates the second cam by a predetermined angle to move the second movable portion when the switching operation of the switching shutter is started, and thereafter, holds the second cam in a state where the rotation is stopped until the switching operation is completed.

8. The switching switch of a tap changer under load as claimed in claim 7, having:

a valve cam that operates the valve opening/closing mechanism; and

and an energy storage mechanism configured to rotate the first cam and the valve cam by releasing the energy storage capacity, and to operate the second cam rotation control mechanism.

9. The switching switch of a tap changer under load of claim 7,

the first cam and the second cam are formed of an insulating material.

10. The switching switch of a tap changer under load as claimed in claim 8, having:

a first connecting rod that connects the first movable portion to a neutral point in a state where the first energizing switch and the first valve switch are off; and

and a second link lever that connects the second movable portion to a neutral point in a state where the first resistance switch is off.

(modified) a load time tap changer having:

a switching shutter of the load time tap changer of any one of claims 3 to 10; and

the tap selector.

Statement or declaration (modification according to treaty clause 19)

In accordance with the provisions of the PCT clause 19, the applicant makes modifications to claims 1-11. The specific modification content is as follows:

deleting claim 1;

2, deleting claim 2;

a modification of claim 3, based on the contents recited in

claims

1, 2 and 3 before the modification;

claim 11 is modified based on the content recited in claim 11 before modification.

Claims

1. A switching switch of a tap changer in load has:

a first current limiting resistor connected to the first tap terminal via a first resistive switch, connected to the first tap terminal in parallel with the valve; and

a second current limiting resistor connected to the second tap terminal via a second resistive switch, connected to the second tap terminal in parallel with the valve.

2. The switching switch of a tap changer under load as claimed in claim 1, having:

a first energizing switch connected to the first tap terminal in parallel with the valve; and

a second energizing switch connected to the second tap terminal in parallel with the valve.

3. The switching switch of a tap changer under load as claimed in claim 2, having:

a valve opening/closing mechanism that opens and closes the valve; and

the cell base is formed of an insulating material,

4. The switching switch of a tap changer under load of claim 3,

the first switch assembly has a fixing portion fixed to the unit base,

5. The switching switch of a tap changer under load of claim 4,

6. The switching switch of a tap changer under load of claim 5,

7. The switching switch of a tap changer under load of claim 6,

a valve cam that operates the valve opening/closing mechanism; and

9. The switching switch of a tap changer under load of claim 7,

the first cam and the second cam are formed of an insulating material.

11. A load time tap changer having:

a switching shutter of the load time tap changer of any one of claims 1 to 10; and

the tap selector.