JP2011054835A - Changeover switch for on-load tap changer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save space, reduce the number of parts and man hours, achieve a good heat dissipation and good insulation performance without receiving any internal pressure restriction, and carry out large capacity formation. <P>SOLUTION: A changeover switch includes: a sealed container which is constituted of an insulated cylinder 40 serving as a pressure bulkhead obtained by forming a recess in a center of an axial direction, a bottom plate 43, and a head cover 9; a transmission shaft 16 arranged on an axial center line in the insulated cylinder with one end connected with a rotary rod 12 supported by the head cover and the other end supported by penetrating a center of the bottom plate; an energy storage mechanism 15 which carries out energy storage of a power of the rotary rod; a drive transmission cylinder 21 which is supported by a holding member 36 provided near the bottom plate and is rotated by the energy storage power; plural vacuum shielding valves which horizontally penetrate a wall surface of the recess formed in the insulated cylinder and arrange a movable terminal side toward an axial center of the insulated cylinder; a drive mechanism which is attached corresponding to the movable terminals of the valves and generates a driving force to open and close each vacuum shielding valve; and a drive transmission mechanism which transmits this driving force to the movable terminals of the vacuum shielding valves one by one. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a switching switch of a load tap switching device.

  The on-load tap switching device is increasingly required to use a vacuum shut-off valve for the switching switch in terms of maintenance and durability. In addition, in the case of transformers for substation facilities installed in urban areas, gas-insulated transformers (hereinafter referred to as GIT) having excellent explosion-proof properties are indispensable from the consideration of neighboring facilities.

  In such an on-load tap changer mounted on such a transformer, the insulating medium becomes an insulating gas, so that a vacuum shut-off valve is inevitably used for the switch. When the transformer has a large capacity, the load current increases. Therefore, a plurality of vacuum shut-off valves used for the switching switch are forced to be mounted, and the necessary components increase accordingly.

  As the components of the switching switch, the actuator expansion / contraction operation guide of the valve, the transmission member, the drive cam, etc., the structure becomes complicated as the number of valves increases, and the entire product becomes larger. GIT is often installed indoors, and space-saving, especially in the height direction, becomes large, but the trade-off between increasing capacity and increasing in the height direction is unavoidable.

  From the standpoint of environmental harm, which has been increasing in recent years, CO2 and N2 are attracting attention as substitute gases for SF6 gas, which has been used as an insulating gas and is harmful to the human body. Because of this restriction, the gas pressure inside the switching switch cannot be raised sufficiently, resulting in inferior heat transfer and insulation characteristics, which hinders the realization of an alternative GIT.

  By the way, in a switching switch using a vacuum shut-off valve, as a structure related to the mounting structure of the vacuum shut-off valve, when operating as a configuration in which the movable side is at atmospheric pressure by connecting the pressure bulkhead and the valve body via a movable-side insulator As a means for improving shock relief and reliability (for example, Patent Document 1) and a vacuum valve driving mechanism, a plurality of vacuum valves are arranged radially, and a vacuum is cut off by eccentric rotation of a fan-shaped rotating body. There is one that opens and closes a valve (for example, Patent Document 2), but the configuration is different from the switching switch that is the subject of the present invention.

  Here, the switching switch of the conventional on-load tap switching device will be described with reference to FIGS. 8 (a), 12, 13, and 14. FIG. FIG. 12 is an external view of the switching switch, FIG. 13 is an internal external view with the insulating cylinder removed, and FIG. 14 is a cross-sectional view of the switching switch.

  As shown in FIGS. 12 and 13, the entire switching switch is configured such that the bottom plate 3 is attached to the lower opening end of the insulating cylinder 1 and the upper end of the insulating cylinder 1 is attached to the hole provided in the transformer tank. And a head lid 9 for closing the opening is attached to the head 2. The insulating cylinder 1 is attached to the bottom plate 3 and the head lid 9 attached to the head 2. Sealed.

  On the other hand, the inside of the switching switch is configured to correspond to the three phases U, V, and W, and as shown in FIG. 8A, four vacuum shut-off valves, that is, main valves (B Pole) 4-1, resistance valve (B pole) 4-3, main valve (A pole) 4-2 and resistance valve (A pole) 4-4, as shown in FIG. 14, main valve (B pole) 4-1 and resistance valve (B pole) 4-3 face each other and are arranged in a straight line in the same direction as the central axis of the insulating cylinder 1, and pass through an insulating rod 24 and a pressurizing mechanism 23 attached to the movable side thereof. The drive housing 34 is slidably supported by the valve guide shaft 32.

  In this way, a combination of two valves arranged in the direction of the central axis of the insulating cylinder 1 is installed around the axis at regular intervals of 60 degrees, and a total of twelve vacuum cutoff valves are used.

  The roller mechanism 22 attached to the drive housing 34 is engaged with the valve drive cam 17 attached to the drive transmission cylinder 21, and the rotation of the transmission gear box 10 provided on the atmosphere side of the head cover 9. Is transmitted to the drive transmission cylinder 21 connected via the rotary drive rod 12 and the accumulating mechanism 15 via the transmission shaft penetrating the central portion of the head cover 9, and the tap selector (not shown) is transmitted by the transmission shaft 16. The drive cam 17 is rotated by the rotation of the drive transmission cylinder 21, and the main valve 4-1 (B pole), the resistance valve (B pole) 4-3, and the actuators of the other valves in the figure are operated. It has become.

  The two valve terminals are connected by a connecting conductor 31 via an intermediate flat mesh wire 18 and are connected to the current limiting resistor 7 by a circuit as shown in FIG. Further, a connection housing 35 is attached to the lower end fixed terminal of the resistance valve (B pole) 4-3, and the through connection terminal 33 contacts the end of the resistance valve (B pole) 4-3 so that the lead connection from the lower surface of the bottom plate 3 to a tap selector (not shown) is performed. It is exposed to the outside as a terminal.

  Therefore, a sealed container is constituted by the insulating cylinder 1, the head 2, the bottom plate 3, and the head lid 9, and the inside thereof is normally set to the atmospheric pressure level due to the pressure resistance restriction of the vacuum shut-off valve 4, and the transformer has the head 2 In the transformer mounting surface 2-1, the upper part is stored in the atmosphere and the lower part is stored in the transformer tank, and the transformer mounting surface 2-1 is mounted by bolt fastening in the transformer mounting hole 2-2. As a result, the outside of the sealed container has an atmosphere under the same medium and pressure as in the transformer tank.

JP 2004-220922 A Japanese Utility Model Publication No. 49-141912

  As described above, in the switching switch of the conventional on-load tap switching device, the vacuum shutoff valve is arranged in the same direction as the central axis direction of the sealed container, so that the dimension of the sealed container in the height direction becomes long. There is.

  In addition, many accompanying parts such as a valve guide shaft, a drive housing, and a fixing member for guiding the operation of the actuator of the vacuum shut-off valve are required, which causes an increase in cost such as space efficiency, man-hours, and material costs.

  Similarly, a connection housing and a through-connection terminal are required for the lead connection of the tap selector, which puts pressure on space, component costs, and man-hours.

  On the other hand, because the medium pressure inside the insulating cylinder cannot be raised sufficiently due to the pressure restriction of the vacuum shutoff valve, there is a restriction on the rated current and the type of the internal insulation medium due to the concern about the temperature rise near the vacuum valve where heat generation is most noticeable. growing.

  Furthermore, since the rotation axis direction of the valve drive cam and the operation axis direction of the vacuum shut-off valve coincide, a load in the thrust direction on the drive transmission cylinder during operation is unavoidable. For these reasons, there are problems that many restrictions cannot be eliminated when enlarging capacity, compacting (height compression), adapting to alternative gas, and the like.

  The present invention has been made to solve the above-described problems, and its purpose is to save space, reduce the number of parts, and reduce man-hours. In the vacuum shut-off valve, connection terminal portion, and neutral point conductor portion, It is an object of the present invention to provide a switching switch for a tap switching device at the time of loading, which can achieve a large capacity and can obtain good heat dissipation and insulation performance without being subjected to pressure restrictions.

  In order to achieve the above object, the present invention provides an insulating cylinder serving as a pressure partition wall having a recess formed in a substantially central portion in the axial direction, a bottom plate for closing a lower surface opening of the insulating cylinder, and an upper surface of the insulating cylinder. A sealed container composed of a head lid that closes the opening, and one end connected to a rotating rod that is disposed on the axis center line in the insulating cylinder and is rotatably supported by the head lid, and the other end Is fixed to a transmission shaft that is rotatably supported by passing through the center of the bottom plate in an airtight manner and that transmits power to the tap selector, and a support member attached to the inner surface of the head lid. An accumulator mechanism that accumulates power by rotation, and is coaxially provided on the outer peripheral side of the transmission shaft, is rotatably supported by a holding member provided near the bottom plate, and is accumulated in the accumulator mechanism. A drive transmission cylinder that rotates by the motive power, A plurality of vacuum shut-off valves that horizontally penetrate the wall surface of the recess formed in the insulating cylinder and have the movable terminal side disposed toward the axial center of the insulating cylinder, and the movable vacuum shut-off valve in the drive transmission cylinder. A drive mechanism that is attached to each terminal and generates a driving force that opens and closes each vacuum shut-off valve in a predetermined sequence, and sequentially transmits the driving force generated by this drive mechanism to the movable terminal of the corresponding vacuum shut-off valve. And a drive transmission mechanism.

  According to the present invention, it is possible to save space, reduce the number of parts and man-hours, and obtain good heat dissipation and insulation performance without being restricted by internal pressure in the vacuum shut-off valve, connection terminal, and neutral point conductor. The switching switch of the on-load tap switching device capable of increasing the capacity can be provided.

The perspective view which shows the tap switch apparatus at the time of the load which applied the switching switch concerning this invention. The perspective view which shows the internal component in 1st Embodiment of the switching switch which concerns on this invention. Sectional drawing which cut | disconnects and shows 1st Embodiment of the switching switch concerning this invention to the orthogonal | vertical direction. Sectional drawing which cut | disconnects and shows the main valve | bulb side in the same embodiment in the horizontal direction. Sectional drawing which cut | disconnects and shows the resistance valve side in the same direction in the horizontal direction. Sectional drawing which cut | disconnects and shows the valve | bulb vicinity in the same embodiment in the perpendicular direction. Sectional drawing which expands and shows the valve | bulb attaching part in FIG. (A) is a valve / resistance circuit diagram, (b) is an explanatory diagram of valve opening / closing timing, and (c) is a diagram showing a valve opening / closing timing chart. The perspective view for demonstrating the assembly state of the internal component in 1st Embodiment of the switching switch concerning this invention. The perspective view which shows the valve drive mechanism part in the embodiment. The perspective view which shows the bottom part side in the insulation cylinder in the same embodiment. The perspective view which shows the external appearance of the conventional switching switch. The perspective view which shows the internal component which removed the insulation cylinder from the switching switch of FIG. The longitudinal cross-sectional view which shows the conventional switching switch.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view showing an overall configuration of a load tap changer to which a change-over switch according to an embodiment of the present invention is applied.

  In FIG. 1, reference numeral 50 denotes a switching switch according to an embodiment of the present invention. A tap selector 14 is attached to the lower part of the switching switch 50 and both are connected by a lead 13, which are not shown in the figure. The tank is inserted and fixed from the hole provided in the tank to the transformer mounting surface at the head of the switching switch 50.

  2 is a perspective view showing an outline of the overall configuration showing an embodiment of a switching switch according to the present invention, FIG. 3 is a cross-sectional view showing the switching switch of the embodiment cut in the axial direction, and FIG. FIG. 5 is a cross-sectional view showing the mounting surfaces (passing through the valve center) of the vacuum shut-off valves configured in two upper and lower stages in a horizontal direction. In addition, the same code | symbol is attached | subjected and demonstrated to the same component as the conventional switching switch shown in FIG. 13, FIG.

  In FIGS. 2 and 3, reference numeral 40 denotes an insulating cylinder serving as a pressure partition formed by narrowing the substantially central portion in the axial direction toward the axial center to form a recess 41. A bottom plate 43 is fastened to the lower opening end of the insulating cylinder 40. A flange-shaped head portion 42 is attached to the upper end portion of the insulating cylinder 40 by a bolt 20 and is attached to a hole peripheral surface of a transformer tank (not shown) by a tightening bolt 8. A head lid 9 is attached to close the container, and the insulating cylinder 40, the bottom plate 43, and the head lid 9 constitute a sealed container.

  As described above, the transformer tank is attached to the transformer tank from above by the transformer mounting surface 42-1 of the head 42. Therefore, the upper part is generally an atmospheric atmosphere and the outside of the insulating cylinder 40 below the border is this surface. The same medium (oil / gas) as the transformer, under the same pressure, and the inside of the insulating cylinder 40 is restricted to the atmospheric pressure equivalent level due to the pressure limit of the movable part of the vacuum shut-off valve 4, and the normal filling medium is the same as the transformer body It becomes.

  A drive transmission gear box 10 is mounted near the center of the head lid 9 of such a sealed container, and the center of the head lid 9 is hermetically penetrated through the drive transmission gear box 10 and is rotatably supported. Power is transmitted to the tap selector 14 shown in FIG. 1 by a transmission shaft 16 which is connected to the rotary rod 12 and is rotatably supported through the center of the bottom plate 43 of the sealed container. .

  Further, an accumulating mechanism 15 driven by the rotation of the rotating rod 12 is fixed to a shut-off portion hanging cylinder 11 attached to the inner surface of the head lid 9 around the rotating rod 12, and the output of the accumulating mechanism 15 is The transmission shaft 16 is transmitted to a drive transmission cylinder 21 coaxially provided on the outer peripheral side of the transmission shaft 16.

  The drive transmission cylinder 21 is rotatably held by a holding member 36 provided in the vicinity of the bottom plate 43 in the insulating cylinder 40, and the valve drive cam 17 is coaxial with the outer peripheral surface at a position corresponding to the recess 41 of the insulating cylinder 40. It is attached to.

  On the other hand, six vacuum shut-off valves 4 are respectively arranged in the upper and lower stages through the wall of the recess 41 formed in the insulating cylinder 40 of the sealed container horizontally. In addition, as shown in FIG. 4 and FIG. 5, the six vacuum shutoff valves 4 in each lower stage are installed in three phases of U, V, and W at 120 degrees, but in this case, U The phase structure will be described.

  As shown in FIG. 6, the U-phase vacuum shut-off valve has a main valve (B pole) 4-1 and a main valve (A pole) 4-2 in the lower stage, and a resistance valve (B pole) 4-3 and a resistance valve in the upper stage. (A pole) 4-4 is arranged radially at intervals of 60 degrees with the movable side facing the central axis side of the insulating cylinder 40.

  A roller mechanism 22 driven by the rotation of the valve drive cam 17 is attached to the movable side end portion (center direction) of each valve. The roller mechanism 22 is attached to the drive cam 17 as shown in FIGS. Cam grooves (main B) 17-1, cam grooves (main A) 17-2, cam grooves (resistor B) 17-3, cam grooves (resistors) provided corresponding to valves 4-1 to 4-4, respectively. A) The contact opening / closing operation is possible at the timing set by engaging with each of 17-4.

  The roller mechanism 22 attached to the valve drive cam 17 and the movable side end of each valve engaged with the cam groove of the valve drive cam 17 generates a drive force for opening and closing each vacuum shut-off valve in a predetermined sequence. The drive mechanism to be configured is configured.

  The lower main valves 4-1 and 4-2 are connected to a valve fixing terminal 4-c located on the outer peripheral side of the insulating cylinder 40 by a neutral point ring 6. It is also connected to the fixed terminal 4-c of the vacuum shutoff valve 4 for the V and W2 phases. As shown in FIG. 2, the neutral point ring 6 is connected to the ground shield ring 5 to ensure a withstand voltage performance with the head 42.

  Furthermore, the movable side connecting movable shaft 25 of the upper stage resistance valve and the lower stage main valve is connected by the intermediate flat mesh wire 18, and the bottom plate 43 in the sealed container is connected by the resistance flat mesh wire 19 from the lower stage side (main valve side). It is connected to the current limiting resistor 7 arranged above, and a circuit as shown in FIG. 8A is configured.

  FIG. 8B is an explanatory view of the switching connection electric circuits (A) to (E) for contact opening / closing, and FIG. 8C is a timing chart thereof.

  Cam grooves 17-1 to 17-4 are formed in the valve drive cam 17 at such timing.

  Here, the mounting structure of the vacuum shut-off valve 4 disposed horizontally through the wall surface corresponding to the recess 41 formed in the insulating cylinder 40 will be described in detail with reference to FIG.

  FIG. 7 is a cross-sectional view representatively showing a vacuum cutoff valve (main valve) 4-1. In FIG. 7, the main valve 4-1 is provided with a fixed terminal 4-c and a movable terminal 4-a that can be contacted and separated from the fixed terminal 4-c in the valve container 4-b. The valve mounting flange 4-e is provided on the outer periphery of the movable side opening end portion of b, and the movable terminal 4-a is slid about several millimeters on the container axis with respect to the fixed terminal 4-b. The contact 4-d is turned on and off.

  The vacuum shut-off valve 4-1 having such a configuration has a wall surface of the concave portion 41 formed in the insulating cylinder 40 with a valve mounting flange 4-e provided on the outer peripheral surface of the movable side opening end of the valve container 4-b. The movable terminal 4-a is fixed to the valve mounting surface formed at the peripheral edge of the penetrating hole by the fastening bolt 27 so that it is horizontal. In this case, since the contact surface between the valve mounting surface formed on the periphery of the through hole portion of the recess 41 and the valve mounting flange 4-e of the valve container 4-b becomes a pressure interface, the O-ring 30 is provided in this portion. It is pinched.

  A thrust bearing 26 is press-fitted as a guide member into a hole passing through the wall surface corresponding to the concave portion 41 formed in the insulating cylinder 40, and the movable connecting member connected to the tip of the movable terminal 4-a by the thrust bearing 26. The shaft 25 is guided in the horizontal direction.

  A flat mesh wire is connected to the connection movable shaft 25 as described above, and an insulating rod 24 is attached to the other end via a connecting pin 29, and a pressurizing mechanism 23 formed at the other end of the insulating rod 24. And a pair of upper and lower roller mechanisms 22 are provided at the other end (the central end of the vacuum shutoff valve).

  The connecting movable shaft 25, a guide member made of, for example, a thrust bearing 26 for guiding the connecting movable shaft 25, and the pressurizing mechanism 23 incorporated in the insulating rod 24 attached to the other end of the connecting movable shaft 25 are a vacuum cutoff valve. The drive transmission mechanism is configured.

  The cam grooves 17-1 to 17-4 formed in the valve drive cam 17 described above have the same shape up and down with respect to the central axis surface of the valve corresponding to the pair of roller mechanisms, and the roller support In consideration of the rotation component not acting on the shaft 28, the rotation of the roller support shaft 28 is restricted by the upper and lower surfaces of the cam groove.

  Next, the assembly structure of the entire switching switch will be described with reference to FIGS.

  As shown in FIG. 9, the switching switch of this embodiment includes an insulating cylinder 40 having a flange-shaped head 42 attached to the upper opening end, a bottom plate 43 attached to the lower opening end of the insulating cylinder 40, and an insulating cylinder. Four vacuum shut-off valves 4 per phase that are attached by horizontally penetrating the outer peripheral surface of the concave portion 41 formed in the substantially central portion of the upper and lower two stages, and the opening portion of the head portion 42 inside the insulating cylinder 40 The drive section contents 37 are incorporated roughly into a drive cam and a roller mechanism which are inserted from the side and which drive the opening and closing of each vacuum shut-off valve 4 corresponding to each of the three phases in a preset sequence. .

  First, after assembling the bottom plate 43 and the vacuum shutoff valve 4 from the outer peripheral direction to the insulating cylinder 40 from below, the drive part contents 37 are inserted into the insulating cylinder 40 from above the insulating cylinder 40. As shown in FIG. 11, the notch 44 of the valve drive cam 17 and the roller protrusion 45 inside the insulating cylinder 40 are matched in phase, and after the head 2 and the head cover 9 are brought into contact with each other, The angle corresponding to the front and rear of the cam groove is rotated to ensure the amount of engagement between the roller mechanism 22 and the cam grooves 17-1 to 17-4.

  As described above, in the embodiment of the present invention, the wall surface of the concave portion 41 formed in the substantially central portion in the axial direction of the insulating cylinder 40 serving as the pressure partition wall is horizontally penetrated and most of the valve body is exposed to the outside. The vacuum shut-off valves 4 corresponding to the respective phases are respectively mounted radially at equal intervals, and the connecting movable shaft 25 for driving the movable terminal of the vacuum shut-off valve 4 and the bearing 26 as the guide member are coaxially arranged inside the insulating cylinder 40. The pressurizing mechanism 23 and the cam contact roller mechanism 22 are provided on the coaxial extension thereof, and are configured to be operable by being engaged with the drive cam 17 rotating around the central axis of the insulating cylinder 40. The fixed terminal portion existing outside the insulating cylinder 40 is directly connected to the lead of the tap selector.

  Therefore, with this configuration, the transformer system as a whole can be saved in space, reduce the number of parts and man-hours, and the pressure restriction inside the switching switch can be reduced at the vacuum shut-off valve, connection terminal, and neutral point conductor. Because it is possible to enjoy the characteristics of the insulation and temperature transmission medium (oil, gas) of the transformer body that is relatively high voltage without being subjected to heat, good heat dissipation and insulation performance can be obtained, and the capacity of the applicable transformer can be increased. Become.

  In addition, since the total height of the switching switch can be kept low, a large-capacity GIT option to be applied in particular is expanded, and development to an alternative GIT is also possible.

  Furthermore, since the driving load of the vacuum shut-off valve is always balanced by the three-phase distribution, the load component in the bending direction of the cam drive shaft can be suppressed, and the thrust load is eliminated from the horizontal arrangement of the valve operating shaft. Operation durability performance can be improved by reducing the load.

  4 ... Vacuum shut-off valve, 4-1 ... Main valve (B pole), 4-2 ... Main valve (A pole), 4-3 ... Resistance valve (B pole), 4-4 ... Resistance valve (A pole), 4-a ... movable terminal, 4-b ... valve container, 4-c ... fixed terminal, 4-d ... valve contact portion, 4-e ... valve mounting flange, 4-f ... lead mounting portion, 5 ... ground shield ring , 6 ... Neutral point ring, 7 ... Current limiting resistance, 8 ... Head fastening bolt, 9 ... Head lid, 10 ... Drive transmission gearbox, 11 ... Shutter suspension cylinder, 12 ... Rotating rod, 13 ... Lead , 14 ... Tap selector, 15 ... Energy storage mechanism, 16 ... Transmission shaft, 17 ... Valve drive cam, 17-1 ... Cam groove (main B), 17-2 ... Cam groove (main A), 17-3 ... Cam groove (resistance B), 17-4 ... Cam groove (resistance A), 18 ... Intermediate flat wire, 19 ... Resistance flat wire, 20 ... Bottom plate fastening bolt, 21 ... Drive transmission cylinder, 22 ... Roller mechanism, 23 ... pressurizing mechanism, 24 ... insulating rod, 25 ... connecting movable shaft, 26 ... thrust bearing, 27 ... valve fastening bolt, 28 ... roller spindle, 29 ... connecting pin, 30 ... valve O-ring, 36 ... Holding member, 37 ... Contents assembly, 40 ... Insulating cylinder, 41 ... Recess, 42 ... Head, 43 ... Bottom plate

Claims (6)

A sealed container comprising an insulating cylinder serving as a pressure bulkhead having a recess formed in a substantially central portion in the axial direction, a bottom plate closing the lower surface opening of the insulating cylinder, and a head lid closing the upper surface opening of the insulating cylinder When,
One end is arranged on the axial center line in the insulating cylinder and is connected to a rotating rod that is rotatably supported by the head cover, and the other end is rotatably supported by airtightly passing through the center of the bottom plate. And a transmission shaft for transmitting power to the tap selector,
An energy storage mechanism that is fixed to a support member attached to the inner surface of the head cover and stores power by rotation of the rotating rod;
A drive transmission cylinder that is coaxially provided on the outer peripheral side of the transmission shaft, is rotatably supported by a holding member provided in the vicinity of the bottom plate, and rotates by power stored in the energy storage mechanism;
A plurality of vacuum shut-off valves each horizontally passing through the wall surface of the recess formed in the insulating cylinder and arranged with the movable terminal side directed toward the axial center of the insulating cylinder;
A drive mechanism attached to the drive transmission cylinder corresponding to the movable terminal of the vacuum shut-off valve, and generating a driving force for opening and closing each vacuum shut-off valve in a predetermined sequence;
A drive transmission mechanism for sequentially transmitting the driving force generated by this drive mechanism to the movable terminal of the corresponding vacuum shut-off valve;
A switching switch of the on-load tap switching device. In the switching switch of the on-load tap switching device according to claim 1,
The plurality of vacuum shut-off valves respectively disposed through the wall surface of the recess formed in the insulating cylinder has a mounting flange provided on the outer peripheral surface of the movable side opening end of the valve container formed in the insulating cylinder. A switching switch for a tap switching device under load, wherein the switching switch is mounted on a wall surface of a recess. In the switching switch of the on-load tap switching device according to claim 1 or 2,
The drive mechanism is attached to the drive transmission cylinder so as to correspond to the movable terminal of the vacuum shut-off valve, and a plurality of cam grooves are formed so that the contact of the vacuum shut-off valve can be opened and closed at a preset timing. A switching switch for an on-load tap switching device, comprising: a driving cam; and a roller mechanism that is attached to a movable side end of each vacuum shut-off valve and engages with a corresponding cam groove of the driving cam. In the switching switch of the on-load tap switching device according to claim 3,
The drive transmission mechanism of each vacuum shut-off valve includes a connecting movable shaft that drives the movable terminal, and a guide member that guides the connecting movable shaft is coaxially formed in a through-hole portion of a wall surface of a recess formed in the insulating cylinder. A switching switch for an on-load tap switching device, characterized in that the roller mechanism is mounted integrally on the coaxial extension line via a pressurizing mechanism. In the switching switch of the on-load tap switching device according to any one of claims 1 to 4,
The switching switch of the on-load tap switching device, wherein the vacuum shut-off valve corresponding to each of the three phases is configured such that the movable side shaft is equally distributed for three phases and balanced. In the switching switch of the on-load tap switching device according to claim 5,
A neutral point conductor or a tap selector lead is directly attached to a fixed side terminal of a vacuum cutoff valve that is radially distributed through the wall surface of a recess formed in the insulating cylinder. Switching switch for tap switching device.

Images