JP6499030B2 - Load tap changer - Google Patents

Description

  The present invention relates to an on-load tap changer.

  The on-load tap changer is a device that switches the tap of the winding in the state where the load current of the transformer is energized according to the voltage fluctuation in order to adjust the voltage of the transmission line or distribution line. There are a type in which the load current is opened and closed in the insulating medium and a type in which a vacuum switch is used for the switching unit.

  The switching switch of the on-load tap changer using the vacuum switch used for the tap changeover of the transformer is connected to the changeover switch that cuts off the current in the tap changeover process and the tap lead wire of the transformer winding. It consists of a tap selector that performs selection. A switching switch is arranged at a position where an insulation distance between the grounds is secured from a state where it is attached to the transformer tank, and the switching switch has a three-phase collective structure for driving a vacuum switch. And it arrange | positions by the stacking | stacking structure by which the tap selector is arrange | positioned under the switching switch of the three-phase collective structure, and it has the structure where a switching switch and a tap selector are connected by a conductor etc. As this type of on-load tap changer, for example, there is an apparatus disclosed in Patent Document 1.

Japanese Patent Publication No. 07-075210

  The conventional on-load tap changer has the following problems because it has a three-phase collective changeover switch and a tap selector. For example, when a tap changer is used for a transformer having a triangular connection, a line voltage is applied to each tap changer, and it is necessary to secure an insulation distance for insulation between the phases. In the conventional vacuum switch type on-load tap changer, the switching switch unit and the tap selector are configured in a stack, so that the entire tap changer becomes large in order to ensure insulation between the respective phases. .

  In order to solve the above-described problems, the present invention provides (1) a plurality of vacuums that constitute the same phase on one surface of an insulating plate that is rotated by a drive shaft linked to an output shaft of a spring energy storage drive mechanism. A switch and a limiting resistor are arranged in a horizontal state, and a cam mechanism that operates by rotation of the drive shaft and an arm member that reciprocates by the cam mechanism are provided. And a tap selector that operates in synchronization with the switching operation of the switching switch, and the tap selector is connected to the other side of the insulating plate. A movable contact connected to the vacuum switch and the limiting resistor provided on the surface side, and a plurality of fixed contacts arranged on a tap selector plate arranged opposite to the insulating plate, and rotates. The movable contact is configured to contact and electrical communication with a predetermined fixed contact by the operation of the edge plate.

  The horizontally placed state refers to a state in which the opening / closing direction of the contact of the vacuum switch is parallel to the insulating plate, that is, the moving direction of the rod for opening / closing the contact is parallel to the insulating plate. The insulating plate corresponds to the switching switch plate 52 in the embodiment. The arm member corresponds to the rocker arms 71 and 72 in the embodiment. The movable contact corresponds to each movable contact in the embodiment, and the fixed contact corresponds to each fixed contact in the embodiment.

  Conventionally, the switching switch and the tap selector have separate configurations, and each has secured the insulation distance between the phases. However, the insulation distance is reduced by integrating the switching switch and the tap selector for each phase on the rotating insulating plate. It becomes possible to reduce the size only by interphase. Since the switching switch and the tap selector are integrally assembled for each phase, the connection between the switching switch and the tap selector can be simplified. Moreover, since unit assembly is possible for each phase, it is possible to improve the assembly workability and shorten the lead time. Also, in a three-phase device, the wiring and layout of the tap windings from the transformer can be unified by shifting the arrangement angle of the stationary contact connecting the tap windings for each phase, thus reducing wiring work errors. be able to.

  Although the number of vacuum switches per phase is two in the first embodiment, it may be three as in the second embodiment, or may be four or more. Further, the drive shaft may also have a two-axis configuration.

  (2) When the outer dimension of the tap selector plate is made larger than the outer dimension of the insulating plate, and the insulating plate and the tap selector plate are arranged to face each other, the outer peripheral edge of the tap selector plate is outside the insulating plate. The tap selector plates of the respective phases arranged so as to overlap each other are connected to each other, and the drive shaft is linked to the tap selector plate so as to be rotatable relative to the tap selector plate. The plates may be connected to rotate integrally. (3) The limiting resistor may be disposed on both sides of the insulating plate.

  In the present invention, the configuration can be simplified and the apparatus can be miniaturized.

1 is an external view showing a preferred embodiment of a load tap changer according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a connection diagram of a load tap changer to which the present invention is applied, wherein (a) is a connection diagram of a load tap changer transformer provided with a load tap changer in a triangular connection transformer, and (b) is a single-turn transformer. (C) is a connection diagram of one phase of the switching switch (1 resistance 2 vacuum switch) connected to the tap 3 of the tap winding 2T. FIG. It is an AA arrow directional view in FIG. 1, and is a figure which shows the switching switch structure (vacuum switch arrangement | positioning and vacuum switch drive mechanism) of this embodiment. It is a BB arrow line view in FIG. 1, and is a figure which shows a tap selector (contact arrangement). It is a figure which shows the drive mechanism of a rocker arm, (a) is a side view, (b) and (c) are examples of a conversion cam shape. It is operation | movement explanatory drawing of the tap switching of a tap switch at the time of load. It is operation | movement explanatory drawing of the tap switching of a tap switch at the time of load. It is operation | movement explanatory drawing of the tap switching of a tap switch at the time of load. It is operation | movement explanatory drawing of the tap switching of a tap switch at the time of load. It is operation | movement explanatory drawing of the tap switching of a tap switch at the time of load. It is operation | movement explanatory drawing of the tap switching of a tap switch at the time of load. It is operation | movement explanatory drawing of the tap switching of a tap switch at the time of load. It is a figure which shows the principal part structure of 2nd Embodiment of this invention, (a) is a switching switch structure (vacuum switch arrangement | positioning and vacuum switch drive mechanism), (b) is a figure which shows a tap selector (contact arrangement | positioning). It is. The connection diagram of the tap switch at the time of the load of 1 resistance 3 vacuum switch corresponding to 2nd Embodiment of this invention, (a) is a figure which shows the state in which the even-side tap is energized, (b) is an odd-number side It is a figure which shows the state which is energizing the tap.

  FIG. 1 shows a first preferred embodiment of the on-load tap changer according to the present invention. As shown in the figure, the on-load tap changer 1 of the present embodiment has a substantially cylindrical outer shape as a whole. The on-load tap changer 1 switches the circuit to a tap selector 20 that selects a tap to be operated among the tap windings of the transformer for each phase, and a tap that is selected while being energized by the tap selector 20. And a switching switch 10. In this embodiment, the switching switch 10 and the tap selector 20 are integrally formed for each phase on the rotating insulator. The arrangement of each phase was U phase, V phase, and W phase in order from the top.

  Further, a spring energy storage drive mechanism 4 for driving the switching switch 10 and the tap selector 20 is disposed above the switching switch 10. The spring energy storage drive mechanism 4 releases the energy stored in the spring 4a and rotates the output shaft 5 at predetermined intervals. Following the rotation of the output shaft 5, the switching switch 10 and the tap selector 20 operate in synchronism, so that a desired tap is selected and the vacuum switch of the switching switch 10 opens and closes. Further, the input shaft of the spring energy storage drive mechanism 4 is connected to the output shaft of the drive motor 45 disposed on the top surface of the top plate 4b, and the input shaft of the spring energy storage drive mechanism 4 rotates as the drive motor 45 rotates. The spring 4a is stored. The rotational force applied to the input shaft is applied manually by the drive motor 45 in this embodiment. Further, in the above-described spring 4a and other components, the top plate 4b is disposed on the bottom plate 4c via the connecting pillar 4d, and the bottom plate 4c and the top plate 4b are integrated with a predetermined distance therebetween. And component parts, such as the spring 4a, are arrange | positioned on the baseplate 4c. Since the spring accumulating drive mechanism 4 can use various conventionally known mechanisms, detailed description thereof is omitted.

  FIG. 2 is an application example of the on-load tap changer according to the present embodiment, and FIG. 2A is a connection diagram of the on-load tap change transformer in which the on-load tap changer is provided in the triangular connection transformer. FIG. 2 (b) is a connection diagram of an automatic voltage regulator in which a self-winding transformer is provided with a load tap changer. A tap winding 2T is connected in series with the main winding 2M, and a plurality (9 in this embodiment) of taps 3 for switching the voltage are provided in the tap winding 2T.

  FIG. 2 (c) shows that one phase (1 resistance 2 vacuum switch) of the switching switch 10 and the tap selector 20 in FIGS. 2 (a) and 2 (b) is connected to the tap 3 of the tap winding 2T. In this state, the tap is switched by moving in the upward or downward arrow direction in FIG. As will be described later, the actual tap switching operation is performed by rotation in a horizontal plane.

  As shown in FIG. 2 (c), the switching switch 10 for one phase includes a first vacuum switch 11, a second vacuum switch 12, and a limiting resistor (current limiting resistor) 13. The More specific circuit configuration is such that the second vacuum switch 12 and the limiting resistor 13 are connected in series, and one end of the first vacuum switch 11 and the side of the limiting resistor 13 that is not connected to the second vacuum switch 12 are connected. Connect to the common connection terminal 14.

  Since the switching switch 10 and the tap selector 20 formed for each phase adopt the same configuration in each phase, the following description will be made taking the U phase set at the top as an example. As shown in FIG. 1, a tap selector plate 51 is disposed below each phase, and a disk-shaped switching switch plate 52 is disposed at a predetermined distance above the tap selector plate 51. Both the tap selector plate 51 and the switching switch plate 52 are formed of an insulator. The tap selector plates 51 of the respective phases arranged above and below are connected to each other with a predetermined distance up and down by a plurality of column portions 43 installed on the circumference. Further, the tap selector plate 51 and the switching switch plate 52 are arranged concentrically and linked to the drive shaft 6 arranged to extend in the vertical direction. The drive shaft 6 is connected to the output shaft 5 of the spring energy storage drive mechanism 4 and rotates together. That is, the drive shaft 6 rotates intermittently as the output shaft 5 rotates.

  As shown in FIG. 3, when viewed from the upper side of the switching switch plate 52, the outer peripheral edge of the tap selector plate 51 protrudes outside the peripheral edge of the switching switch plate 52, and the tap selector plate 51 is switched. The centers of the switch plates 52 coincide.

  The tap selector plate 51 supports the drive shaft 6 by bearings, and both are relatively rotatable. That is, as shown in FIG. 4, a through hole 51a is formed at the center position of the tap selector plate 51, and the drive shaft 6 is inserted and disposed so as to penetrate through the through hole 51a. The upper and lower tap selector plates 51 are connected to each other, and the drive shaft 6 is rotatably supported so that the drive shaft 6 is allowed to rotate.

  On the other hand, the switching switch plate 52 is connected to the drive shaft 6 and rotates integrally with the drive shaft 6. Therefore, when the drive shaft 6 rotates intermittently, the tap selector plate 51 does not rotate and the switching switch plate 52 rotates intermittently, and the relative angular position between the tap selector plate 51 and the switching switch plate 52 is increased. The relationship will change.

  As shown in FIG. 4A, the tap selector plate 51 is provided with a plurality of conductor plates having a predetermined pattern on the upper surface thereof, and each conductor plate constitutes a predetermined fixed contact. That is, the common fixed contact 53 includes a circular conductor plate 53a concentric with the through hole 51a, and a strip-shaped conductor plate 53b extending radially outward from the circular conductor plate 53a. The leading end of the strip-shaped conductor plate 53 b reaches the outer peripheral edge of the tap selector plate 51.

  A plurality of tap fixing contacts 54 are arranged radially on the outer peripheral side of the circular conductor plate 53a. The tap fixing contact 54 includes an arcuate conductor plate 54a that is discretely arranged on a concentric circle with the through hole 51a as the center, and a strip-like conductor plate 54b that extends radially outward from the arcuate conductor plate 54a. The leading end of the strip-shaped conductor plate 54 b reaches the outer peripheral edge of the tap selector plate 51. The tap fixed contact 54 (tip of the strip-shaped conductor plate 54b) is connected to the corresponding tap of the tap winding through the tap connection line 3S and is conducted.

  Each conductor plate 53a, 53b, 54a, 54b is inserted and disposed in a recess 51b formed on the upper surface of the tap selector plate 51. As shown in FIG. 4B, the depth of the recess 51b is made equal to the thickness of the arcuate conductor plate 54a. The same applies to the other conductor plates. Thereby, the surface of the conductor plate and the upper surface of the tap selector plate 51 are flush with each other.

  As shown in FIG. 3, two vacuum switches (first and second vacuum switches 11, 12) and a limiting resistor 13 are arranged horizontally on the switching switch plate 52. That is, the first vacuum switch 11 and the second vacuum switch 12 are arranged horizontally, parallel to a predetermined diameter of the switching switch plate 52, and equidistant from the diameter. Further, a limiting resistor 13 is arranged in parallel outside the second vacuum switch 12. As shown in FIG. 1, two limiting resistors 13 are arranged above and below the switching switch plate 52.

  A first contact 11 a is built in the first vacuum switch 11. In the state shown in FIG. 3, the first contact 11a is closed, and the first vacuum switch 11 is closed. One contact piece 11a ′ of the first contact 11a is fixed in the first vacuum switch 11, and the other contact piece 11a ″ is disposed so as to be movable forward and backward in the thrust direction. This other contact piece. 11a ″ moves forward and backward, so that both contact pieces 11a ′, 11a ″ come into contact with each other and the contact is closed, and the contact is opened. The one contact piece 11a ′ is the lead member 55. Is connected to the first movable contact 56 constituting the switching switch 10 disposed on the lower surface side of the switching switch plate 52. The first movable contact 56 may be constituted by, for example, a roller contact. The one movable contact 56 is brought into contact with the arcuate conductor plate 54a of the tap fixed contact 54 to be conducted.

  The other contact piece 11a ″ is electrically and mechanically connected to the rod 57, and opens and closes the contact with the movement of the rod 57 in the thrust direction. The rod 57 is electrically connected to the lead member 58. It connects with the common movable contact 59 which comprises the switching switch 10 arrange | positioned in the lower surface side of the switching switch board 52 via the lead member 58. Thereby, the other contact piece 11a "is conduct | electrically_connected to the common movable contact 59. . The common movable contact 59 is preferably constituted by a roller contact, for example. Then, the common movable contact 59 is brought into contact with the circular conductor plate 53a of the common fixed contact 53 to be conducted.

  Similarly, a second contact 12 a is built in the second vacuum switch 12. In the state shown in FIG. 3, the second contact 12a is closed, and the second vacuum switch 12 is closed. One contact piece 12a ′ of the second contact 12a is fixed in the second vacuum switch 12, and the other contact piece 12a ″ is arranged so as to move forward and backward in the thrust direction. This other contact piece. When 12a ″ moves forward and backward, both contact pieces 12a ′ and 12a ″ come into contact with each other and the contact is closed, and the contact is opened. The one contact piece 12a ′ is a lead member 65. Is connected to a second movable contact 66 constituting the switching switch 10 arranged on the lower surface side of the switching switch plate 52. The second movable contact 66 may be constituted by, for example, a roller contact. The two movable contacts 66 are brought into contact with the arcuate conductor plate 54a of the tap fixed contact 54 to be conducted.

  The other contact piece 12a ″ is electrically and mechanically connected to the rod 67, and opens and closes the contact with the movement of the rod 67 in the thrust direction. The rod 67 is connected via a limiting resistor 13 (not shown). The lead member 68 is electrically connected, and is connected to a common movable contact 59 disposed on the lower surface side of the switching switch plate 52 via the lead member 68.

  The tip 57a of the rod 57 connected to the other contact piece 11a ″ of the first vacuum switch 11 and the tip 67a of the rod 67 connected to the other contact piece 12a ″ of the second vacuum switch 12 are respectively The tips 71a and 72a of the first and second rocker arms 71 and 72 are linked. The base ends 71b and 72b of the first and second rocker arms 71 and 72 are linked to a common rotating shaft 73 and swing independently of each other about the rotating shaft 73 as a rotation center. This swing is driven by a cam mechanism that operates as the drive shaft 6 rotates.

  That is, as shown in FIGS. 3 and 5A, the first gear 75 is connected to the drive shaft 6 and rotates integrally. The first gear 75 meshes with a second gear 77 that is connected to an operating shaft 76 that is rotatably arranged on the switching switch plate 52. A first conversion cam 81 and a second conversion cam 82 are connected to the operation shaft 76 while being shifted in the vertical direction, and rotate together with the rotation of the operation shaft 76. Thereby, when the drive shaft 6 rotates, the first conversion cam 81 and the second conversion cam 82 rotate.

  The outer peripheral side surface of the first conversion cam 81 serves as a cam surface, and the cam follower 84 attached to the intermediate position of the first rocker arm 71 contacts the cam surface. Similarly, the outer peripheral side surface of the second conversion cam 82 becomes a cam surface, and the cam follower 85 attached to the intermediate position of the second rocker arm 72 contacts this cam surface. As shown in FIGS. 5B and 5C, the first and second conversion cams 81 and 82 are provided with convex portions 81a and 82a on a part of the outer peripheral side surface constituting the cam surface. As a result, when the first conversion cam 81 rotates, when the cam follower 84 attached to the first rocker arm 71 comes into contact with the convex portion 81a, it is biased outward and rotated counterclockwise in FIG. The tip 71a of the arm 71 moves in a direction away from the first vacuum switch 11. As a result, the other contact piece 11a ″ moves in a direction away from the one contact piece 11a ′. Similarly, when the second conversion cam 82 rotates, the cam follower 85 attached to the second rocker arm 72 is protruded 82a. 3, it is urged outward and rotates clockwise in Fig. 3, and the tip 72a of the second rocker arm 72 moves away from the second vacuum switch 12. Thereby, the other contact piece 12a is moved. "" Moves in a direction away from one contact piece 12a '.

  In this way, the vacuum switches 11 and 12 are respectively connected to the predetermined vacuum switches 11 and 12 in accordance with the rotation of the conversion cams 81 and 82 and the rocker arms 71 and 72 through the first gear 75 provided on the drive shaft 6. Are opened and closed and the current is switched in the tap switching process. Specifically, it is as follows.

  FIG. 6 shows an example of the pre-operation state. In this state, the first movable contact 56 and the second movable contact 66 contact the same tap fixed contact 54 (here, the tap fixed contact 54 connected to the tap “2”), and the first vacuum switch 11. The contacts of the second vacuum switch 12 are both closed. The common movable contact 59 is in contact with the common fixed contact 53.

  FIG. 7 shows the state of the operation process 1. In this state, the drive shaft 6 is rotated (operating angle 5 °) by the operating force of the spring energy storage drive mechanism 4, and the switching switch plate 52 and the first gear 75 connected to the drive shaft 6 are rotated. Then, the two movable contacts 56 and 66 and the common movable contact 59 attached to the switching switch plate 52 are the tap fixed contact 54 (arc-shaped conductor plate 54a) and the common fixed contact 53 (circular conductor plate) of the tap selector plate 51. 53a) Move while sliding.

  At this time, the first gear 75 rotates together with the rotation of the drive shaft 6, and the second gear 77 meshed with the first gear 75 also rotates. As a result, the operating shaft 76 to which the second gear 77 is connected, and thus the first conversion cam 81 and the second conversion cam 82 rotate. Then, the cam follower 84 of the first rocker arm 71 rides on the convex portion 81a of the first conversion cam 81, and the first rocker arm 71 swings (rotates counterclockwise in the figure). The tip 57a of the rod 57 operates in the swinging direction of the first rocker arm 71, and the first contact 11a in the first vacuum switch 11 connected to the rod 57 is opened. In this state, a current flows through the second vacuum switch 12 and the limiting resistor 13 side.

  FIG. 8 shows the state of the operation process 2. In this state, the drive shaft 6 continues to rotate due to the operating force of the spring energy storage drive mechanism 4, and the switching switch plate 52, the first gear 75, and the second gear 77 also continue to rotate. As a result, the first movable contact 56 attached to the switching switch plate 52 contacts the tap fixed contact 54 connected to the tap “3”, and the second movable contact 66 is fixed to the tap “2”. It remains in contact with the contact 54. At this time, the first movable contact 56 which has shifted from the tap “2” to “3” is connected to the opened first vacuum switch 11 and is in an unloaded state, so that no arc is generated.

  FIG. 9 shows the state of the operation process 3. In this state, the drive shaft 6 continues to rotate due to the operating force of the spring energy storage drive mechanism 4, and the switching switch plate 52, the first gear 75, and the second gear 77 also continue to rotate. As a result, the first movable contact 56 contacts the tap fixed contact 54 connected to the tap “3”, and the second movable contact 66 continues to contact the tap fixed contact 54 connected to the tap “2”. However, the contacted angular position advances. Further, since the cam follower 84 of the first rocker arm 71 is disengaged from the region where the convex portion 81a of the first conversion cam 81 is formed, the first rocker arm 71 is returned to the original position by the elastic restoring force of a spring (not shown). To do. As a result, the rod 57 operates, and the other contact piece 11a ″ of the first contact 11a connected to the rod 57 moves in the approaching direction to the one contact 11a, and the first contact 11a is closed by contact.

  FIG. 10 shows the state of the operation process 4. In this state, the drive shaft 6 continues to rotate due to the operating force of the spring energy storage drive mechanism 4, and the switching switch plate 52, the first gear 75, and the second gear 77 also continue to rotate. As a result, the first movable contact 56 contacts the tap fixed contact 54 connected to the tap “3”, and the second movable contact 66 continues to contact the tap fixed contact 54 connected to the tap “2”. However, the contacted angular position further advances. Then, the cam follower 85 of the second rocker arm 72 rides on the convex portion 82a of the second conversion cam 82 and swings. The rod 67 operates in the swinging direction of the second rocker arm 72, and the second contact 12a in the second vacuum switch connected to the rod 67 is opened. In this state, a current flows through the first vacuum switch 11 side.

  FIG. 11 shows the state of the operation process 5. In this state, the drive shaft 6 continues to rotate due to the operating force of the spring energy storage drive mechanism 4, and the switching switch plate 52, the first gear 75, and the second gear 77 also continue to rotate. The first and second movable contacts 56 and 66 attached to the switching switch plate 52 come into contact with the tap fixed contact “3”. At this time, since the second movable contact 66 which has shifted from the tap “2” to “3” is connected to the second contact 12a in the open second vacuum switch and is in a non-energized state, no arc is generated.

  FIG. 12 shows the state of the operation completion state. In this state, the drive shaft 6 continues to rotate due to the operating force of the spring energy storage drive mechanism 4, and the switching switch plate 52, the first gear 75, and the second gear 77 also continue to rotate. Since the cam follower 85 of the second rocker arm 72 is disengaged from the region where the convex portion 82a of the second conversion cam 82 is formed, the second rocker arm 72 returns to the original position by the elastic restoring force of a spring (not shown). As a result, the rod 67 operates, and the other contact piece 12a ″ of the second contact 12a connected to the rod 67 moves in the approaching direction to the one contact piece 12a ′. After that, taps can be switched by repeating the same process.

  FIGS. 13 and 14 show a tap changer, a change-over switch, and a connection diagram for one phase of a load-type tap changer of the 1-resistor 3-vacuum switch according to the second embodiment of the present invention. One end of the first vacuum switch 11, one end of the limiting resistor 13 directly connected to the second vacuum switch 12, and one end of the third vacuum switch 15 are connected to a common connection terminal (common fixed contact 53). Yes. Along with this, a rocker arm 72 'and a cam follower 85' for opening and closing the contact of the third vacuum switch 15, and a third conversion cam connected to the operating shaft 76 (having a convex portion at a predetermined position on the outer peripheral surface, the cam follower 85 'is urged to move the rocker arm 72'). On the other hand, the other end of the vacuum switch 11 is connected via a second movable contact 56 to a tap fixed contact 54R of an even-numbered tap. The other end of the second vacuum switch 12 and the other end of the third vacuum switch 15 are connected to each other and connected to the tap fixing contact 54 </ b> L of the odd-numbered tap via the second movable contact 66.

  In the state shown in FIG. 14A, the first vacuum switch 11 is closed, and the second vacuum switch 12 and the third vacuum switch 15 are open. In this state, the tap fixed contact 54R, which is the second tap, is connected to the common connection terminal 14 via the first movable contact 56 and the first vacuum switch 11, and the voltage is adjusted.

  FIG. 14B shows a state in which the tap is switched from the state of FIG. 14A to the odd-numbered third tap fixed contact 54L. In this state, the first vacuum switch 11 is in an open state, and the third vacuum switch 15 is in a closed state. A tap fixed contact 54L, which is the third tap, is connected to the common connection terminal 14 via the second movable contact 66 and the third vacuum switch 15, and the voltage is adjusted by switching from the tap 54R to the tap 54L. The second vacuum switch 12 performs an operation of open circuit → close circuit → open circuit in the tap selection process. Since other configurations and operational effects are the same as those of the above-described embodiment, the same reference numerals are assigned to corresponding members, and detailed descriptions thereof are omitted.

DESCRIPTION OF SYMBOLS 1 Load tap changer 2 Winding 2M Main winding 2T Tap winding 3 Tap 3S Tap connection line 4 Spring energy storage drive mechanism 4d Connection pillar 5 Output shaft 6 of spring energy storage drive mechanism 10 Drive shaft 10 Switching switch 11 One vacuum switch 12 Second vacuum switch 13 Limiting resistor 14 Common connection terminal 15 Third vacuum switch 20 Tap selector 43 Column 45 Drive motor 51 Tap selector plate 52 Switching switch plate (insulating plate)
53 Common fixed contact 54 Tap fixed contact 56 First movable contact 59 Common movable contact 66 Second movable contact 67 Rod 73 Rotating shaft 76 Operating shaft

Claims (3)

A plurality of vacuum switches and limiting resistors constituting the same phase are arranged in a horizontal state on one surface of an insulating plate that is rotated by a drive shaft that is linked to an output shaft of a spring energy storage drive mechanism, and the drive shaft A switching mechanism provided with a cam mechanism that operates by rotation of the arm and an arm member that reciprocates by the cam mechanism, and that opens and closes the vacuum switch by reciprocating movement of the arm member to perform current switching in the tap switching process. When,
A tap selector that operates in synchronization with the switching operation of the switching switch;
The tap selector is provided on the other surface side of the insulating plate, the movable contact connected to the vacuum switch and the limiting resistor, and the tap selector plate arranged to face the insulating plate. A load tap changer comprising: a plurality of fixed contacts, wherein the movable contact is in contact with and energized with a predetermined fixed contact by the operation of the rotating insulating plate. When the outer dimension of the tap selector plate is made larger than the outer dimension of the insulating plate, and the insulating plate and the tap selector plate are arranged to face each other, the outer peripheral edge of the tap selector plate protrudes to the outside of the insulating plate. And
Connect the tap selector plates for each phase placed one above the other,
The drive shaft is linked to the tap selector plate so as to be freely rotatable,
2. The on-load tap changer according to claim 1, wherein the drive shaft and the insulating plate are connected to rotate integrally.   The on-load tap changer according to claim 1 or 2, wherein the limiting resistor is disposed on both sides of the insulating plate.

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