JP2019125706A - Tap changer and stationary induction apparatus with the same - Google Patents

Abstract

To provide a tap changer that can enhance a degree of freedom of arrangement of an operator to make it easy to operate the operator and confirm a tap position, and a stationary induction apparatus with the same.SOLUTION: A tap changer 6 according to an embodiment comprises: tap terminals 10 as a plurality of fixed contacts to which a plurality of tap wires 9 led out of transformer winding 4 (winding) are connected to respectively; a movable contact 12 which electrically connects two tap terminals 10 to each other; a slide plate 13 which has the movable contact 12 arranged; a gear 14 which meshes with the slide plate to rotate and a rotating mechanism which rotates the gear 14; a handle 7 as an operator provided outside a tank 2 of a transformer 1 (stationary induction apparatus); two operation cables 16 which couple the side of the handle 7 and the side of the rotating mechanism to each other; and an outer tube 19 which houses the operation tables 16 in a tensed state.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to a tap changer and a static induction device having the same.

  For example, in a static induction device such as a transformer having a tap changer, an operating element such as a handle for switching the tap position is provided outside the tank, and this operating element is conventionally disclosed, for example, in Patent Document 1 It was connected to the tap changer via the drive shaft.

JP 2005-311017 A

  However, in the case of the conventional structure, the relative position between the tap changer and the operation element, more specifically, the relative position in the left and right direction and the front and back direction of the tank is fixed, so the arrangement of the operation element is freely selected. I could not do it, and the degree of freedom in placement was low. In addition, in the case of the conventional structure, since the operating element is disposed at the upper part of the tank, it is difficult to operate the operating element from the ground in a large transformer etc. and it is also possible to confirm the tap position from the ground. It was difficult.

  Therefore, it is possible to provide a tap changer capable of enhancing the degree of freedom of the placement of the manipulation element and easily performing the manipulation of the manipulation element and the tap position, and the stationary induction device having the same.

  The tap changer according to the embodiment includes a plurality of fixed contacts to which a plurality of tap lines drawn from the windings are respectively connected, and any two fixed contacts which are movable relative to the fixed contacts. A rotating contact composed of a movable contact for electrically connecting the contacts, a slide plate on which the movable contact is disposed and partially cut away, and a gear that rotates by meshing with the teeth of the styled plate A mechanism and an operation element provided outside the tank and capable of rotating operation in forward and reverse directions are connected between the operation element side and the rotation mechanism side, and the rotation operation of the operation element is transmitted to rotate the gear. And an outer tube that accommodates the operation cable in a tensioned state.

The figure which shows typically the structure of the transformer of embodiment Diagram schematically showing a tap changer Diagram schematically showing the drive side rotating body Diagram schematically showing the operation cable Diagram schematically showing the handle and rotating body on the operation side Diagram schematically showing the outer tube Diagram schematically showing a winding state and a rewinding state of the drive side rotating body Diagram showing the operating mode of the handle

Hereinafter, embodiments will be described with reference to the drawings.
As shown in FIG. 1, a transformer 1 as a stationary induction device in the present embodiment includes a tank 2, an iron core 3 accommodated in the tank 2, and a transformer body 4 as a winding. 5, a tap changer 6, and a handle 7 as an operating element provided outside the tank 2. The inside of the tank 2 of the transformer 1 is filled with insulating oil (not shown), and the transformer main body 5 is accommodated in the insulating oil in a state of being immersed therein.

  The iron core 3 which comprises the transformer main body 5 is comprised by laminating | stacking a thin-plate-like electromagnetic steel plate, for example as it is known. In this embodiment, a tripod iron core having three legs as the iron core 3 is adopted. Each of the legs of the core 3 is provided with a transformer winding 4 respectively. These three transformer windings 4 respectively correspond to three phases of U phase, V phase and W phase.

  The transformer winding 4 of each phase is provided, for example, on the upper part of the tank 2 and is connected to three bushings 8 communicating with the inside of the tank 2 respectively. Further, the tap wire 9 is drawn out of the transformer winding 4 of each phase, and is connected to the tap terminal 10 of the tap changer 6. The tap terminal 10 corresponds to a fixed contact. The tap line 9 is well known and thus detailed description is omitted. However, the tap line 9 is provided to make the turns ratio of the transformer 1 variable.

  More specifically, as shown in FIG. 2, the tap changer 6 is provided with a terminal plate 11 provided with six tap terminals 10 corresponding to each phase, and any two taps of each phase. The slide plate 13 is provided with three movable contacts 12 electrically connecting the terminals 10 and is partially toothed, and the toothed portion 13a of the slide plate 13 is engaged with the toothed portion 13a for rotation. And the gear 14 which slides the slide plate 13 linearly. The slide plate 13 and the gear 14 constitute a so-called rack and pinion type rotation mechanism together with a drive side rotation body 15 described later.

  Assuming that the six tap terminals 10 of each phase provided in the terminal plate 11 are numbered 1 to 6 sequentially from the left side, that is, from the side opposite to the gear 14, the terminal plate 11 has number 1 of each phase The sixth to sixth tap terminals 10 are arranged at equal intervals (T) from each other, and are arranged such that the distances to the same-numbered tap terminals 10 of the other phases are equal. Further, the three movable contacts 12 provided on the slide plate 13 are arranged at equal intervals.

  Therefore, when the movable contact 12 corresponding to the U phase is in a position where the first and second tap terminals 10 are electrically connected, the movable contact 12 corresponding to the V phase is also the first and second taps. The terminals 10 are electrically connected to each other, and the movable contact 12 corresponding to the W phase is also electrically connected to the first and second tap terminals 10.

  Although not shown, the tap terminal 10 penetrates the terminal plate 11 and is electrically connected by the movable contact 12 at the back side of the terminal plate 11, that is, at a portion projecting toward the slide plate 13 side. It has a structure. Hereinafter, a tap position at which the movable contact 12 of each phase electrically connects between the first and second tap terminals 10 is referred to as a first position (P1), and an electrical connection between the second and third tap terminals 10 is provided. The tap position where the connection is made is referred to as the second position (P2), the tap position where the third and fourth tap terminals 10 are electrically connected is referred to as the third position (P3), and the fourth and fifth The tap position at which the tap terminals 10 are electrically connected is referred to as a fourth position (P4), and the tap position at which the fifth and sixth tap terminals 10 are electrically connected is referred to as a fifth position (P5).

  Also, moving the movable contact 12 from the first position (P1) to an adjacent position such as the second position (P2), for example, is also referred to as movement for one tap for convenience. FIG. 2 schematically shows the movable contact 12 in the first position (P1). However, the number of tap terminals 10 and the number of tap positions shown in the present embodiment are an example, and the present invention is not limited to this.

  Switching of the tap position of the tap changer 6 is performed by operating the handle 7 provided on the tank 2. The handle 7 is operated by an operator, and can be rotated in normal and reverse directions. Here, it is assumed that forward rotation is clockwise rotation as viewed from the operator, and forward rotation is counterclockwise rotation as viewed from the opposite operator.

  Further, the handle 7 is provided on the right side in the front view of the tank 2 shown in FIG. 1 in the present embodiment, but may be provided on the left side, the front or the back. That is, the handle 7 can be provided on the side surface of the tank 2, that is, any side surface vertically rising from the ground, at a position where operation and visual recognition from the ground are possible. Of course, it is also possible to attach it to the upper surface of the tank 2.

  The handle 7 side and the tap changer 6 side are connected by two operation cables 16 (see FIG. 7) for transmitting the rotational movement of the handle 7 in forward and reverse directions to the tap changer 6 side. More specifically, the drive-side shaft member 14a serving as the rotation shaft of the gear 14 of the tap changer 6 is a drive-side rotation that rotates integrally and coaxially with the drive-side shaft member 14a as a rotation mechanism for rotating the gear 14. A body 15 is provided. As schematically shown in FIG. 3, the drive-side rotating body 15 is a thin disc having a through hole 15a formed at the center thereof for passing the drive-side shaft member 14a, and the corner portion in a side view is It is formed in the shape chamfered to curved surface shape.

  In addition, while the two drive grooves 15b are formed at different positions in the thickness direction on the outer peripheral surface of the drive side rotation body 15, the end portion of the operation cable 16 shown in FIG. 4 corresponding to the respective cable grooves 15b. The accommodating part 15c which accommodates the connection terminal 16a of this is provided. The housing portion 15 c is formed at a position shifted by 120 ° in the circumferential direction of the drive-side rotating body 15 in plan view. That is, one end side of each of the two operation cables 16 is fixed to the gear 14 side, that is, to the drive side rotation body 15. And although the details will be described later, the two operation cables 16 are wound in opposite directions to pull the gear 14 by pulling the drive side rotation body 15 in accordance with the forward and reverse rotation of the handle 7. Rotate.

  The diameter of the portion where the cable groove 15b is formed, that is, the winding diameter when the operation cable 16 is wound, is set to D1. The winding diameter (D1) also corresponds to the winding diameter of the operation cable 16 in the rotation mechanism. Further, the winding diameter (D1) is set to be larger than the gear diameter (D2) of the gear 14 which is to be coaxially rotated. The details of the relationship between the winding diameter (D1) and the gear diameter (D2) will be described later.

  The other end side of the operation cable 16 is connected to the handle 7 side. More specifically, as schematically shown in FIG. 5, the other end side of the operation cable 16 is fixed to the operation side rotation body 18 provided on the handle 7 side. Although a simplified diagram is shown in FIG. 5, the handle 7 and the operation side open single unit 18 are provided in a watertight and airtight manner inside and outside the tank 2.

  The operation side rotary body 18 is formed in a substantially cylindrical shape, and a spiral groove 18a for aligning and winding the operation cable 16 is formed on the outer peripheral surface thereof. Although the end of the operation cable 16 may be configured to be provided with the connection terminal 16a similarly to the drive side rotating body 15, the end is configured to be fixed by caulking or the like in order to obtain an appropriate length. be able to.

  The operation side rotation body 18 is attached to the operation side shaft member 7a which is a rotation shaft of the handle 7, rotates integrally and coaxially with the operation side shaft member 7a, and two operation cables 16 are wound in mutually opposite directions. Be At this time, the diameter of the spiral groove 18a, that is, the winding diameter (D3) around which each operation cable 16 is wound, is set smaller than the winding diameter (D1) of the drive-side rotating body 15. The details of the relationship between the winding diameter (D3) and the winding diameter (D1) will be described later.

  Further, an outer tube 19 shown in FIG. 6 is provided between the drive side rotating body 15 and the operation side rotating body 18. The outer tube 19 accommodates the respective operation cables 16 in a slidable and tensioned state. Here, the state in which the tension is applied means a state in which a tension state in which the operation cable 16 is stretched from the drive side rotating body 15 to the operation side rotating body 18 is maintained. The outer tube 19 is composed of a tube main body 19a and an adjuster 19b provided on at least one side of the tube main body 19a.

  The adjuster 19b is fixedly arranged, for example, in an arc, in the middle of the path from the driving side rotation body 15 to the operation side rotation body 18, and the adjuster 19b is rotated, for example, to rotate the tube main body 19a in the longitudinal direction. The tension of the operation cable 16 can be adjusted by relatively moving the adjuster 19b to change the radius of the arc. An adjustment mechanism for adjusting the tension may be provided in the path of the operation cable 16 instead of or in addition to the adjuster 19b, or the direction of the operation cable 16 is changed to a substantially right angle. A movable roller may be provided at the position where In addition, a plurality of outer tubes 19 may be provided in the path of the operation cable 16.

Next, the operation of the above configuration will be described.
As described above, in the case of the conventional structure, since the position of the operation element is fixed, the arrangement of the operation element can not be freely selected, and the operation element needs to be disposed on the top of the tank 2 Therefore, it was difficult to operate the controls from the ground, especially in a large transformer, and to check the tap position from the ground. In addition, when the tap changer 6 is increased in size, the rotational torque of the operation element is also increased, which causes a problem that a large force is required for operation.

  Therefore, in the present embodiment, the operator can increase the degree of freedom of the arrangement of the handle 7 as follows, so that the operation of the handle 7 and the confirmation of the tap position can be easily performed from the ground. There is.

  First, in the transformer 1 of the present embodiment, as described above, the handle 7 side operated by the operator and the tap changer 6 side for switching the tap are connected by the two operation cables 16. As a result, the path of the operation cable 16 can be varied, and the relative position of the handle 7 to the tap changer 6 can be freely selected. Therefore, for example, the handle 7 can be arranged at a position where the handle 7 can be operated from the ground or the tap position can be confirmed, or the like, whereby the degree of freedom in the arrangement of the handle 7 can be enhanced.

  Further, in the embodiment, the winding diameter (D1) of the drive side rotation body 15 is set larger than the gear diameter (D2) of the gear 14 and the winding diameter (D3) of the operation side rotation body 18 is set to the drive side rotation body 15 Is set smaller than the winding diameter (D1) of Thereby, as described below, the force applied to the handle 7 can be reduced when switching the tap.

  FIG. 7 is a plan view of the drive-side rotating body 15 viewed from above, and shows the first position (P1) to the fifth position (P5). The first position (P1) to the fifth position (P5) are assigned to the drive-side rotating body 15 at five positions among the positions equally divided into six in the circumferential direction. That is, in the present embodiment, it is possible to move the movable contact 12 from the first position (P1) to the fifth position (P5) in a state where the rotation of the drive side rotation body 15 is less than one rotation.

  In this case, since it is not necessary to wind the operation cable 16 around the drive side rotation body 15 a plurality of times, it is possible to simplify the shape and actual manufacture of the drive side rotation body 15. Hereinafter, the state in which the movable contact 12 is positioned at the first position (P1) is referred to as a rewinding state, and the state in which the movable contact 12 is positioned at a fifth position (P5) is referred to as a winding state Do. Further, for simplification of the description, the operation cable 16 for pulling the drive side rotation body 15 and rotating the drive side rotation body 15 in the direction shown by the arrow CW when rewound is referred to as a rewind side operation cable 16A. When winding up, the operation cable 16 that pulls the drive side rotation body 15 and rotates the drive side rotation body 15 in the direction indicated by the arrow CCW is referred to as a winding side operation cable 16B.

  At this time, since the drive side rotation body 15 rotates integrally with the gear 14, the apparent difference distance (L 1) of the operation cable 16 in the rewinding state and the winding state shown in FIG. Corresponds to the length required when moving the first position (P1) to the fifth position (P5).

  Here, what is apparently referred to is that the position of the end of the operation cable 16 does not actually move, but the length of the operation cable 16 wound around the operation side rotation body 18 changes. It is. In the rewinding state shown in FIG. 7, many operation cables 16A on the rewinding side are wound on the operation side rotating body 18 as shown in FIG. 5, and the operation cables 16B on the rewinding side are almost sent out. It is in the state.

In this case, if the winding diameter (D1) of the drive-side rotating body 15 is made larger than the gear diameter (D2) of the gear 14, the gear 14 can be rotated with a smaller force. Therefore, the gear diameter (D2) of the gear 14 and the winding diameter (D1) of the drive-side rotating body 15 are set to satisfy the relationship of the following equation (1).
D1> D2 (1)

Further, since the amount of rotation of the drive side rotating body 15 and the amount of rotation of the gear 14 are in a one-to-one relationship, one tap for 1/6 of the length for one turn of the winding diameter (D1) is The movement distance in minutes corresponds to the distance (T) between the tap terminals 10. Therefore, the gear diameter (D2) of the gear 14 and the winding diameter (D1) of the drive-side rotating body 15 are set to satisfy the relationship of the following equation (2).
(1/6) · D1 · π = T (2)

  In addition, since the drive side rotation body 15 and the gear 14 are manufactured by machining, for example, in the case of T = 40 mm, a range satisfying the formula (2) by providing a predetermined tolerance, for example, setting D1 = 150 mm. By setting to, it is possible to suppress excessive deterioration of the manufacturability.

  By the way, on the tap changer 6 side, the winding diameter (D1) and the gear diameter (D2) may be set so as to move by the necessary distance as described above, but on the handle 7 side, when operating There are other issues to consider besides reducing the required power. Specifically, since the handle 7 is operated by the operator, the operator can grasp the current tap position and the tap position to be switched, can clearly divide and recognize each tap position, and It is required not to make an incorrect operation.

  Among them, with regard to the fact that the operator can grasp the current tap position and the tap position to be switched, as shown in FIG. 8, for example, “P1”, “P2”, “P3”, “P4” , The current tap position, the tap position to be switched, and the operation by arranging the character identifier (M1) such as “P5” at five positions out of equally dividing the rotation direction of the handle 7 into, for example, six circumferential directions. It is considered that it is possible to grasp the direction to be used and to clearly distinguish and recognize each tap position.

  In addition, it is considered possible to prevent an erroneous operation by arranging an identifier (M2) such as a character such as "rewinding" or "rolling up" and an arrow. In the case of rewinding, it is possible to switch to the next tap position by rotating 300 ° counterclockwise.

  By the way, in order to reduce the force required to rotate the handle 7, simply speaking, the winding diameter (D3) of the operation side rotating body 18 is made larger than the winding diameter (D1) of the driving side rotating body 15 It is believed that it can be operated with less power. However, with such a relationship, the above-described six equal parts can not be disposed, and the distance between the switching positions must be reduced, and the distance between the switching positions becomes smaller. Adjustment of the position is required, which may reduce the workability.

  Therefore, in the present embodiment, when the tap positions of the first position (P1) to the fifth position (P5) are arranged counterclockwise so as to be equally and sequentially adjacent to each other in the rotational direction of the handle 7, arrow marks As shown in, the operation direction of the handle 7 is set in the opposite direction to the arrangement order of the tap positions. That is, for example, in the case where the tap position is switched from the first position (P1) to the second position (P2), the handle 7 is configured to be rotated 5/6 of one rotation, that is, 300 °. Thus, the tap position can be switched when the rotation of the handle 7 is less than one rotation, and the possibility of an operation error can be reduced as compared with the case where the handle 7 is rotated several times.

At this time, the winding diameter (D3) of the operation side rotating body 18 and the winding diameter (D1) of the driving side rotating body 15 are set so as to satisfy the relationship of the following formula (3).
(5/6) · D3 · π = (1/6) · D1 · π
That is, D3 = (1/5) · D1 (3)

  Therefore, as described above, for example, in the case of T = 40 mm and D1 = 150 mm, D3 = 30 mm. Thereby, the size reduction of the operation side rotary body 18 can be achieved. In addition, since the operation-side rotating body 18 is also manufactured by machining, it is possible to suppress excessive deterioration of the productivity by setting a predetermined tolerance and setting the range to substantially satisfy the expression (3). . Of course, it is also possible to design the drive side rotating body 15 and the operation side rotating body 18 so as to strictly satisfy the equations (2) and (3).

  In this case, assuming that the maximum torque on the gear 14 side at the time of switching the tap position is X [Nm], the force (F1) required to rotate the drive side rotation body 15 is F1 = X / 9.8 ··· (2 / D1) [kgf]. In addition, unit conversion shall be performed suitably. And, since the torque (Y) of the drive side rotary body 15 required to rotate the drive side rotary body 15 with the force (F1) is Y = F1 · 9.8 · (D3 / 2) [Nm], Even with some allowance, it will be approximately X / 5.

  Therefore, considering the length of the handle 7, that is, the position expected to be touched by the operator when operating the handle 7, the force required for operating the handle 7 can be further reduced, which is easy. The handle 7 can be rotated. Further, since the ratio between the rotation amount of the drive side rotation body 15 and the rotation amount of the operation side rotation body 18 is 1: 5, even if the hand shakes when operating the operation side rotation body 18, the shake is Since the influence on the tap position is suppressed to 1/5, the workability at the time of operating the handle 7 can also be improved.

According to the transformer 1 described above, the following effects can be obtained.
The tap changer 6 of the embodiment is movable relative to the plurality of fixed contacts to which the plurality of tap lines 9 drawn from the transformer winding 4 are respectively connected, and any of the fixed contacts. The movable contact 12 electrically connecting between two fixed contacts, the slide plate 13 in which the movable contact 12 is disposed and a part of the teeth is cut, and the teeth of the style plate are engaged And a rotating mechanism for rotating the gear 14, a handle 7 as an operating element provided on the outside of the tank 2 of the transformer 1 and capable of normal and reverse rotational operations, and the handle 7 side Two operation cables 16 which connect between the rotation mechanism side and transmit rotation operation of the handle 7 to rotate the gear 14 and an outer tube 19 which accommodates the operation cable 16 in a tensioned state Preparation That.

  As a result, it becomes possible to freely select the relative position of the handle 7 with respect to the tap changer 6 by variously taking the path of the operation cable 16, and a position where the handle 7 can be operated from the ground and the tap position can be confirmed. The degree of freedom in the arrangement of the handle 7 can be increased, for example, by Therefore, the degree of freedom in the arrangement of the handle 7 can be enhanced, and the operation of the handle 7 and the confirmation of the tap position can be easily performed. In this case, by disposing the handle 7 at a position taking into consideration the peripheral equipment of the transformer 1 etc., it is possible to improve the freedom of installation of the transformer 1 at the time of installation in a substation etc., for example.

  Further, the tap changer 6 rotates integrally with the rotary shaft of the gear 14 with the ends of the two operation cables 16 fixed thereto and the two operation cables 16 are in opposite directions to each other. Is provided as a rotation mechanism, and the winding diameter (D1) when the operation cable 16 is wound around the driving-side rotating member 15 is made larger than the gear diameter (D2) of the gear 14 . As a result, since the force required to rotate the gear 14 is reduced, the handle 7 can be easily rotated even with a large one.

  The tap changer 6 rotates integrally with the rotary shaft of the handle 7 with the rotary shaft, and the ends of the two operation cables 16 are fixed, and the two operation cables 16 are in opposite directions to each other. The winding diameter (D3) when the operation cable 16 is wound around the operation side rotator 18 and the winding diameter (D1 when the operation cable 16 is wound around the rotation mechanism) are provided. It was smaller than).

  As a result, the operation side rotary body 18 can be miniaturized, and the rotation amount, that is, the rotation amount of the drive side rotary body 15 in the embodiment and the rotation amount of the drive side rotary body 15 cause a difference. Even if the hand shakes when operating the side rotation body 18, the influence of the shake on the tap position is suppressed, so that the workability at the time of operating the handle 7 can be improved.

  Further, as in the embodiment, by setting the winding diameter (D3) of the operation-side rotating member 18 to 1⁄5 of the winding diameter (D1) of the driving-side rotating member 15, it takes to rotate the drive-side rotating member 15. The occurrence of an operation error can be suppressed without increasing the force. Moreover, the transformer 1 arranges the handle 7 on the side of the tank 2. Thereby, the operation of the handle 7 and the confirmation of the tap position can be easily performed from the ground.

  In the embodiment, the transformer 1 is described as an example of the stationary induction device, but as the stationary induction device, for example, a reactor or the like can be adopted other than the transformer 1. That is, the tap changer 6 can be applied not only to the transformer 1 but also to other devices such as a reactor.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

  In the drawings, 1 is a transformer (stationary induction device), 2 is a tank, 3 is an iron core, 4 is a transformer winding (winding), 5 is a transformer main body, 6 is a tap changer, 7 is a handle (operation element 7a: operation side shaft member (rotational axis of operation element) 9: tap line 10: tap terminal (fixed contact) 12: movable contact 13: slide plate 14: gear 14: drive side The shaft member (rotation shaft of the gear), 15 indicates a drive side rotator, 16 indicates an operation cable, 18 indicates an operation side rotator, and 19 indicates an outer tube.

Claims (5)

A plurality of fixed contacts to which a plurality of tap wires drawn out from the winding are respectively connected, and an electrical connection between any two of the fixed contacts which is movable relative to the fixed contacts A movable contact to be connected, a slide plate on which the movable contact is disposed and partially cut away, and a rotation mechanism configured by a gear that rotates by meshing with the teeth of the styled plate;
An operator provided outside the tank and capable of rotating in forward and reverse directions;
Two operation cables which connect between the operation element side and the rotation mechanism side and transmit the rotational movement of the operation element to rotate the gear;
An outer tube that accommodates the operation cable in a tensioned state;
A tap changer comprising: The drive-side rotating body which rotates integrally with the rotating shaft, the ends of the two operating cables are respectively fixed to the rotating shaft of the gear, and the two operating cables are wound in opposite directions to each other Provided as the rotation mechanism,
The tap changer according to claim 1, wherein a winding diameter when the operation cable is wound around the drive side rotation body is larger than a gear diameter of the gear. An operation side rotating body which is integrally rotated with the rotating shaft, the ends of the two operating cables are respectively fixed to the rotating shaft of the operating element, and the two operating cables are wound in opposite directions to each other Is provided,
The tap switching according to claim 1 or 2, wherein a winding diameter when the operation cable is wound around the operation side rotation body is smaller than a winding diameter when the operation cable is wound around the rotation mechanism. vessel.   The tap switch according to any one of claims 1 to 3, wherein the controller is disposed on a side surface in a state where the tank is installed.   A static induction device comprising the tap changer according to any one of claims 1 to 4.

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