JPH02178906A - Energy storage mechanism of on-load tap changing device - Google Patents

Abstract

PURPOSE:To surely prevent burning and service interruption accident, etc., by providing a hooking cam which force-shifts additionally a driving frame to a specified position coacting with a driving shaft so as to make it surely perform hooking with a hooking piece. CONSTITUTION:An eccentric disc 48 and a hooking cam plate 50, which are so provided as to be capable of coacting with a driving shaft 83, rotate in the same direction, and also the long side a of the hooking cam plate 50 abuts on a stopper seat 52a, and in case that the hooking is difficult, it performs the auxiliary role. Hereupon, when the hooking of a driving frame 33 is released, the driving frame 33 shifts quickly to a specified position by the energy stored in an energy storage spring 37, and the hooking cam plate 50, which coats with the driving shaft 83, presses this driving frame 33 so that it may effect the auxiliary role of the energy stored in the energy storage spring 37 immediately before being hooked with a hooking piece 38. Accordingly, the driving frame 33 can be hooked surely at a certain position, whereby it can surely prevent the burning failure of a current limiting resistor, which is caused by hooking disconnection of the driving frame 33 at the time of tap change-over, surface interruption accident, which is caused by timing slippage of change-over between a change-over switch and a tap selector, or the like.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an on-load tap switching device that quickly switches the taps of a transformer, an accelerator, etc. without interruption, and particularly,
After the energy storage mechanism of the switching switch in the on-load tap switching device is operated and tap switching is performed, the energy storage mechanism is surely locked and held so that the next tap switching operation can be performed smoothly and well. Concerning improvements to the M force mechanism.

[Prior art] The switching switch in the resistance-type load tap switching device is
By instantaneously releasing the energy stored in the energy storage spring of energy storage a#4, each contact of the switching switch or each vacuum switch corresponding to each of the contacts is set to a predetermined position. It is configured to open and close while maintaining the switching sequence.

In particular, in recent years, in consideration of disaster prevention, the use of transformers has changed from oil-filled transformers to, for example, SF6 gas-filled, ie, gas-insulated transformers.

For this reason, in on-load tap changers, if the current is interrupted by a contact exposed in the gas, the insulation properties of the gas may be impaired due to arcing problems or flying metal pieces, etc. Vacuum switches have often been used instead.

In this case, since the drive source is an electric motor, it was necessary to convert its rotational motion into the linear reciprocating motion required to open and close the vacuum switch. As an energy accumulating mechanism for opening and closing each contact of the switching switch while maintaining a predetermined switching solenoid, for example, an energy accumulating mechanism disclosed in Japanese Patent Publication No. 52-471.31 is known. The schematic structure will be explained with reference to FIGS. 9 and 10.
-5 The guide frame of the energy storage mechanism That is, flanges 5 are integrally formed at both ends of each of the frames 1 and 2, and the guide shafts 3 and 3' are inserted through guide portions 6 provided on these flanges 5. A storage spring 7 loosely fitted to the guide rod 33' is inserted between the flanges 5.5 at both ends of each frame 12.

A driving shaft 8 is supported by a bearing of the casing 4 and penetrates through each of the frames 1 and 2 from a direction perpendicular to the forward and backward directions thereof. An eccentric disc 10 rotatably fitted between parallel guides 9 and 9 formed in the above is attached and the lower part thereof is connected to a tamp selector (not shown).

Further, below the center of the drive frame 2, there is a switching crank 11 rotatably attached to the drive shaft J shaft 8, and a switching crank 1 for each drive frame 2.
] A cam plate 12 provided on the upper surface, the cam plate 12
It is drivingly connected to the drive frame 2 via an engagement pin 13. History G, 2. On the side perpendicular to the advancing and retreating direction of guide frame 1,
A pair of locking pieces 1/1.1 supported by +lX on gauging 4
A release piece 15 for releasing 4' is integrally provided in a protruding manner. Further, a tension spring 17 is inserted between the ends of the IL pieces 14+4' so that one of the locking pieces can always be engaged with and held in the engaging portion 16 of the cam plate 12.

Then, when the eccentric disk 10 is rotated by the drive shaft 8, the guide frame 1 moves to the left in FIG. Accordingly, the energy storage spring 7 is forced between the flanges 5.5 of the guide frame 1 and the drive frame 2. In this state, the release piece 15 of the guide frame 1 is attached to the locking piece 14.
is pressed against the force of the tension spring 17, and this locking piece 14
When the engagement between the drive frame 2 and the cam plate 2 is released, the drive frame 2 moves to the left in FIG. Cam plate 1
2 is rotated quickly in the counterclockwise direction in FIG.

[Problems to be Solved by the Invention] However, in the mechanism of the conventional on-load tap changer, when the surrounding medium is insulating oil, the arc generated when each contact is opened contaminates the insulating oil and causes the oil to leak into the insulating oil. When the sludge floating in the S
In the case of an insulating gas such as Fb gas, when the lubricant applied to the drive part of the energy storage mechanism has been depleted due to long-term use, the guide shafts 3.
There was a risk that a large frictional force would be generated between the two and prevent smooth operation.

That is, when the switching switch is switched, the energy storage mechanism moves the drive frame 2 by the energy storage force of the energy storage spring, and also moves the cam plate 12.
is rotated, and after the rotation, the cam plate 12 is secured to the locking piece 14. or 14' to prepare for the next switching operation. However, as mentioned above, if the friction force in the drive part of the energy storage mechanism is large for some reason, the energy storage force of the energy storage spring 7 can be effectively applied, and as a result, the drive frame 2 The movement becomes slow just before engaging the engaging portion 16 of the cam plate 12, and after the rotation of the cam plate 12, the locking piece 14 or 14 cannot be smoothly engaged with the engaging portion 16. The switching of the switching switch ends in this state. In this case, the eccentric disk 0 continues to rotate until the electric motor stops even after the locking pieces 14 and 14' are released, but at this point, the energy storage spring 7 is in the guide frame. 1 and does not act on the drive frame 2,
Even if the guide frame 1 can be moved by the eccentric disc 10, the drive frame 2
cannot be moved, and the locking piece 14 or 14' cannot be engaged with the cam plate 12. When the drive shaft 8 is rotated in this state for the next switching, the cam plate 12 is not locked by the locking piece 14, so the drive frame 2 will also move at the same time as the guide frame I moves. The energy storage spring 7 is no longer able to store energy, and the cam plate 12 also rotates via the engagement pin 13 due to the displacement force of the guide plate 2. In such a state, the switching switch and the tap selector operate almost simultaneously, that is, the tap switching by the tamp selector and the contact switching of the switching switch are performed almost simultaneously, and the tap switching operation is not performed. This is done when the timing of both devices is out of sync, causing a momentary power outage. Further, the switching switch cannot utilize the stored force of the storage spring 7, and operates at the driving speed of the electric motor, so instantaneous switching cannot be performed. As a result, it takes time to change the taps, and when the taps are changed, current flows through a current limiting resistor (not shown) for a long time, which may cause a burnout accident.

Furthermore, when switching the contacts of a changeover switch, the switching time becomes longer and the duration of the arc inevitably becomes longer.
There was also the problem of premature wear and tear on the contacts. Further, it is thought that the above-mentioned problem can be solved to some extent by using a large-sized power storage pan in order to increase the power stored, but this would increase the size of the power storage mechanism itself and be uneconomical.

In view of the above-mentioned problems, the present invention adds a locking cam plate to the eccentric disc that moves together with the drive shaft when switching the switching switch, and by making it work together with the eccentric disc, the energy storage mechanism is activated. When the operation of the drive unit becomes slow, the driving force of the electric motor is effectively used to forcibly drive the plate and the locking piece of the energy storage mechanism after the switching switch is switched. Provides the storage a and the side of the tap switching device under load, which securely locks the cam plate of the crank and reliably prevents burnout of the current limiting resistor and power outage accidents that occur during the next tap switching operation. It's about doing.

[Means for Solving the Problems] A drive frame is slidably attached to a guide shaft provided between supporting walls of a machine frame, and a drive frame is provided on the drive frame that is loosely engaged with the guide shaft. The machine is equipped with sliding bodies that individually slide, and a power storage spring that stores energy by sliding of the sliding bodies is inserted between the drive frame and the sliding bodies, and a drive frame is provided on the side of the machine frame. A locking piece is provided to lock the drive frame at each position when it is moved to a predetermined position, and a release piece is installed on the drive frame side to release the locking of the drive frame by the locking piece by sliding of the sliding body. , a locking cam plate is provided on the sliding body to co-operate with the drive shaft to forcibly move the drive frame to a predetermined position to ensure locking with the locking piece. shall be.

[For production]

After the storage force of the storage spring is stored by the movement of the sliding body,
When the drive frame is unlocked, the drive frame rapidly moves to a predetermined position due to the stored force of the storage spring, and just before it is locked by the locking piece, it moves in conjunction with the electrically driven drive shaft. Immediately before the rapidly moving drive frame stops its movement, a locking cam plate pushes the drive frame so as to serve as an auxiliary to the storage force of the energy storage spring. This ensures that the drive frame is locked in place, and prevents current limiting resistor burnouts caused by the drive frame becoming unlatched when changing taps, and power outages caused by mismatched switching timing between the switching switch and tap selector. It is characterized by being designed to slightly prevent accidents, etc.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. Note that the present invention will be described with reference to an example in which a vacuum switch is used as a contactor of a switching switch.

In FIG. 1, reference numeral 20 indicates a switching switch of a load tap switching device, and this switching switch 20 includes a frame 21, an energy storage mechanism 25 attached to the frame 21, and a vacuum switch drive mechanism 65. , a plurality of vacuum switches 70, and a current limiting resistor 8
0, and the configuration of each mechanism and member will be explained below.

The frame body 21 is constructed by connecting a base plate 22 with a bearing cylinder 82 attached at the center, a frame 23 disposed above the base plate 22, and a lower frame 24 disposed below the base plate 22 by a connecting rod 81.

The energy storage mechanism 25 consists of an energy storage section 26, an operation section 27 for operating the same, and a drive section 28 driven by the 81 energy section 2[i, and includes the energy storage section 26 and a machine frame 26a, This machine frame 2
6a is a support plate 29 fixed to the substrate 22 via support columns, and support walls 30.3 standing upright at both ends of this support plate 29.
Consists of 0. As shown in FIG. 4, guide shafts 3131 are arranged parallel to each other in the front-rear direction (vertical direction in the figure) between the support walls 30 and 30. A drive frame 33 is formed on a rectangular frame with a horizontally elongated surface, and has a long hole 32 for inserting a drive shaft 83 that passes through a bearing tube 82 in the center position.
4 interposed between the support walls 3030 so as to be able to move laterally (in the left-right direction in FIG. 3). As shown in FIGS. 1 and 2, a sliding body 35 is mounted on the drive frame 33, and this sliding body 35 moves in both directions (up and down in FIG. By fitting the two flanges 36, 36, which are vertically disposed in the vertical direction), into the guide rod 313I via bearings, the two flanges 36, 36 slide along the guide rods 3I, 31 in the same manner as the drive frame 33. Furthermore, four energy storage springs 37 are inserted between the drive frame 33 and the sliding body 35, with the guide shafts 31 and 31 respectively inserted, and the inserted state is shown in FIG. , as shown in FIG. 4, between the bearing 34 of the drive frame 33 and the flange 36.
6 are inserted in a screwed state. Next, as shown in FIGS. 1 and 4, the support plate 29 of the machine frame 26a
A pair of locking pieces 3838' for locking the drive frame 33 at a predetermined moving position are pivotally attached to the . A locking pawl 39.39 is also provided at the other end, and a contact portion 404 is provided at the other end.
Further, at the farthest end opposite to the IIK attachment part, a tension spring 41 is stretched between the ends. A release piece 42 for releasing the lock of the locking piece 3838' is attached to the sliding body 35. Further, on the lower side of the drive frame 33, there is a buffer device 4 for cushioning the drive frame 33 when it moves to a predetermined position.
3.43' is mounted on the support plate 29. This shock absorber, z, 43' is the case 4 attached to the support plate 29.
4, a buffer pin 45 that moves back and forth in parallel with the drive frame 33, and a compression spring 46 inserted between the case 44 and the buffer pin 45.
It is provided with a stopper 47, 47' attached to the lower part of the drive frame 33 to buffer the movement of the drive frame 33 in a predetermined direction.

Next, the operation section 27 will be explained. As shown in FIG. 2, the upper part is supported by the bearing cylinder 82 and
An eccentric disk 48 is fixed to a drive shaft 83 which penetrates the sliding body 35 through the elongated hole 32 and is drivingly connected to an electric motor (not shown), with its mounting position greatly eccentric. On the periphery of the plate 48, there is a rotating member 7+ such as a bearing that slides into contact with the eccentric disk 48 at an interval of approximately 180°.
960 is rotatably mounted on the sliding body 35, and further,
On the eccentric disk 48, there is a horizontally elongated locking cam plate 50 with one side long (right side in FIG. 2) and the other short.
As shown in the figure, the center portion of the body is fixed integrally with the eccentric disk 48 and is attached to the drive shaft 83 so as to be movable therewith. Then, the both ends of the tiij recorder 1) Nicum plate 50 are
As shown in the figure, an arc-shaped groove is formed in this embodiment, and on the long side a side of the locking cam kill 50, as shown in FIG. A first stopper seat 52a is rotatably mounted on a base 51''-, and when the drive frame 33 is moved by a required dimension in a predetermined direction, the long side a side of the locking cam plate 50 is When the protruding end comes into contact with the stopper seat 52a, it plays an auxiliary role when it is difficult to lock the drive frame 33 in a predetermined position. Furthermore, on the opposite side of the drive frame 33 provided with the first stopper seat 52a, a second stopper seat 52a is provided at the same distance from the longitudinal center of the drive frame 33 as the first stopper seat 52a. The stopper seat 521) is rotatably mounted via the pedestal 51'.

Next, the drive unit 28 will be explained. As shown in FIG. 1, this drive unit 28 has a switching crank 54 integrally formed with a swing cam 53 on the upper part thereof, which is rotatably attached to a bearing tube 82 via a bearing. At the bottom, as shown in FIGS. 1 and 4, there is a connector 56 with a vertical hole 55 drilled therein.
Attach the swing cam 53 to the vertical hole 55 of the connector 56.
By inserting the drive pin 57 fixed to the drive pin 57, the energy storage section 26 and the drive section 28 are drivingly connected. Note that the peripheral edge G of the swing cam 53 is connected to the locking piece 38.3 as in the fourth article.
An engaging stepped portion 5859 is formed to engage with the locking claw 39 of 8", and one of the locking pieces 3B and 38" is
When the locking pawl 39 is locked to the engagement stepped portion 58, the drive frame 33 can be accurately held at the right position (first operating position) of the machine frame 26a, not shown in FIG. . Also, as shown in FIG. 7, move the drive frame 33 to the left and lock the locking piece 38''.
is engaged with the other engagement step 59 of the swing cam 53, the drive frame 33 is moved to the second position of the left example of the machine frame 26a shown in FIG.
Hold it accurately in the operating position. In these cases, the locking cam plate 50 disposed on the eccentric disk 48 has its long side a in contact with the first or second stomper seat 52a, 52b on the moving direction side of the drive j frame 33, and is not engaged. Stop piece 38.38
' , the drive frame 33 is engaged and held at a predetermined position. Next, the vacuum switch drive mechanism 65 will be explained. As shown in FIG. 1, this mechanism 65 consists of a drive cam body 66 and an opening/closing operation section 67 of a vacuum switch 70.
The drive cam body 66 has a required number of vacuum switches 7 on its periphery.
A cam groove 68 is formed by combining a horizontal portion and an inclined portion so that the movable electrode 71 of No. 0 can be raised and lowered in a timely manner according to the switching sequence. The drive cam body 66 provided with the cam groove 68 is rotatably attached to the bearing sleeve 82 via a bearing as shown in FIG.
It is drivingly connected integrally with the switching crank 54.

On the other hand, the same number of opening/closing operation parts 67 of the vacuum switch 70 as the vacuum switches 70 are arranged in a circle on the board 22 at equal intervals around the axis of the drive cam body 66. It has a built-in elevating means (not shown) that is drivingly connected to the movable electrode 7I of the swing chia 0, and a driven pin 69 connected to this elevating means is connected to the cam groove 6 of the drive cam body 66.
8, the drive cam body 66 and the opening/closing operation section 67 are drivably connected.

Further, the vacuum switch 70 (not limited to this, and other known open/close contacts may be used) has a fixed electrode 72 in a container 73 with a high vacuum inside, and a vertically movable electrode 72 with respect to the container 73. A lead wire 75 is connected to an insulating plate 74 which is attached to the substrate 22 via a connecting member and is made up of the movable electrode 71 that is provided in the
It is disposed concentrically with the opening/closing operation section 67 via a handle piece 76 connected to the opening/closing operation section 67.

A conductive neutral point ring 84 is attached to the substrate 22 and connected to the movable electrode 71 of each vacuum switch 70 by a braided lead 85.

Further, a connecting conductor 86 is connected to the neutral ring 84, and the other end of the connecting conductor 86 is connected to a neutral bushing of a transformer (not shown).

Next, the operation will be explained.

When the drive shaft 83 is rotated in the direction of the arrow in FIG.
3, an eccentric disk 48 and a locking cam plate 50 are provided so as to be able to move together.
rotate in the same direction. The rotating member 49 in sliding contact with the eccentric disk 48 is pushed by the rotation of the eccentric disk 48, and the sliding body 35 is moved to the left in FIG. 2, and as shown in FIG. As shown, they are unevenly distributed with respect to the drive frame 33.

When the sliding body 35 is moved as described above, as shown in FIG. 5, the energy storage spring 37 located on the advancing direction side of the sliding body 35 (left side in FIG. 5) is compressed, and conversely, the storage spring 37 located on the opposite side By stretching the energy storage springs 37 located at (on the right side in FIG. 5), the energy storage forces of each energy storage spring 37, that is, the four energy storage springs 37, are stored. At this point, as shown in FIG. 5, since the locking pawl 39 of the locking piece (38) is engaged and held by the engagement step portion 58 of the swing cam 53, the drive frame 33 as shown in FIG. As shown in FIG. 5, the original position of the machine frame 26a (
It is held locked in the first operating position). At this time, since the plate 50 is rotated by the locking force l, the lock with the first stopper seat 52a is released. The eccentric disk 48 continues to rotate from the above state, pushing the sliding body 35 to the left in FIG.
2, the locking pawl 39 is rotated counterclockwise in FIG.
It's out of 8. When the locking piece 38 comes off, the drive frame 33
Since the springs are unlocked, the stored force stored in the four springs 37 moves the machine frame 26a from its original position (right side in the figure) shown in FIG. 5 to the position shown in FIGS. The engine rapidly moves to the left side of the machine frame 26a (second operating position). With the rapid movement of the drive frame 33, a drive bin 57 drivingly connects the drive frame 33 and the swing cam 53 of the switching crank 54.
is forcibly moved within the vertical hole 55 of the connector 56, and rotates the swing cam 53 counterclockwise from the state shown in FIG. 5 to the position shown in FIG. 8. The rotation of the swing cam 53 is used as a driving force for the switching crank 54 to drive the vacuum switch drive mechanism 65.
The vacuum switch 70 is opened and closed, and the switching switch 20 is rapidly switched.

On the other hand, as shown in FIGS. 7 and 8, the drive frame 33
When you quickly move to the second operating position on the left side of the machine frame 26a,
The stopper 47 of the drive frame 33 comes into contact with the buffer pin/15 of the shock absorber 43, is received as a shock absorber, and is stopped. As a result, the drive frame; 33. Connector 56. Damage to parts constituting the drive unit 28, such as the drive pin 57, is prevented. and,
As mentioned above, when the drive frame 33 moves to the second operating position on the left side of the machine frame 26a (not shown in FIG. 7), at this point,
As shown in FIG. 8, the locking pawl 39 of the locking piece 38' engages with the engaging stepped portion 59 of the switching crank 54, and the drive frame 33 is moved into the second operation shown in the second V. Lock and hold in position. In this case, the locking cam plate 50, which is fixed to the sliding body 35 so as to be able to move together with the eccentric disc 48, is rotated approximately 180 degrees from the position shown in FIG. 2, as shown by the solid line in FIG. In this state, it is locked to the second stopper seat 52b. As shown in FIG. 6, the locking cam plate 50 includes the locking piece 38 and the swing cam 5;
3 is about to be released by the release piece 42, the long side a side is still in a position where it does not come into contact with the second stopper I1.52b. However, when the locking piece 38 is released, the drive frame 33 rapidly moves to the machine frame 26a shown in No. 7M.
As if moving to the left, the locking force 1. If the temporary 50 is moved to the position indicated by the two-dot chain line in FIG.
The locking cam plate 50 is provided so as to be locked with the bar seat 52b, and when the locking cam plate 50 is locked with the second shaft (seat 521) by the movement of the drive frame 33, the locking cam plate 50 is locked with the bar seat 52b. As shown in FIGS. 7 and 8, the locking pawl 39 of the piece 38' engages with the engagement step 59 of the swing cam 53, and then the drive shaft 83 is rotated by the electric motor. The locking cam plate 50 is the seventh
It rotates to the solid line position in the figure and stops.

As a result, in the energy storage mechanism 25 of the present invention, the locking piece 38 can be reliably locked to the swing cam 53 by the locking cam plate 50, and the drive frame 33 can be held at a predetermined locking position. .

Next, when the drive shaft 83 is rotated in the opposite direction, the eccentric disk 48 is rotated clockwise in FIG. 7, and the locking cam plate 50 is accordingly rotated in the same direction. The sliding body 35 is moved in the opposite direction to that described above, that is, to the right in FIG. In this case, the drive frame 33 is prevented from moving because the locking pawl 39 of the locking piece 38' is engaged with the engagement step 59 of the swing cam 53, so that the drive frame 33 is prevented from moving. You can measure the momentum. Thereafter, when the locking piece 38'' is unlocked by the release piece 42 due to the movement of the sliding body 35, the drive frame 33 is moved as shown in FIG. The machine frame 26; rapidly moves from the left side position 1 to the right side position of the machine frame 26a shown in 2nd I, that is, from the second operating position to the first operating position.

By this movement, the switching crank 54 is rapidly rotated in the opposite direction, and the rotational force is transmitted to the vacuum switch drive mechanism 65, thereby performing quick switching of the switching switch 20.

Next, while the energy storage mechanism 25 is in operation, the energy storage section 26
．． If the operation of the drive unit 28 becomes slow for some reason, for example, if it is filled with oil, the drive frame 3 may be damaged due to sludge in the oil.
When friction resistance or the like in the driving portion 3 increases, the drive frame 33 is forcibly moved in a predetermined direction by the stored force of the storage spring 37. However, after the movement, the locking piece 38. or 38' to the engaging step portion 58 of the swing cam 53.
Or even if an attempt is made to lock it to 59, the moving speed slows down due to the frictional resistance of j just before the locking occurs, and the locking may not be possible. In such a case, in the present invention (J, Section 1
1- The cam plate 50 is attached to the locking piece 38 as shown in 11″lJ.
Also, just before the locking piece 38' is locked, it is provided so that it can be slightly locked with either the first or second spring I-flange II52a52b. Even if the locking cam plate 5° cannot be engaged with the engaging stepped portion of the rocking cam, the locking cam plate 5° is moved by the drive shaft 83 to the electric motor until it reaches the normal stopping position (the position shown by the solid line in Fig. 2 and Fig. 7). It can be moved using the drive of As a result, as the locking cam plate 50 continues to rotate, the tip of the long side portion a is moved to the first position.
Alternatively, it comes into contact with the second stopper seats 52a and 52b and pushes them. That is, since the drive frame 33 can be moved to a predetermined position, the locking piece 38 or 38'
By moving the drive frame 33, it is possible to reliably engage the engagement step portion 58 or 59 of the swing cam 53 that rotates via the drive bin 57, thereby holding the drive frame 3; 3 at a predetermined movement position. can.

This makes it possible to perform the next switching operation of the switching switch smoothly and reliably.

〔Effect of the invention〕

As explained above, in the present invention, a horizontally elongated locking cam plate is attached to the - face of the eccentric disk directly connected to the drive shaft,
On both sides of the locking cam plate in the length direction, a pair of stopper seats that come into contact with the locking cam plate when the drive frame moves to a fixed position are arranged in a drive frame 2 so that they can come into contact with the locking cam plate. The drive frame is arranged and moved to a fixed position by the stored force of the storage spring, and the locking piece is locked with the swinging cam of the switching crank, and the locking cam plate is brought into contact with the stopper seat. Since the energy storage mechanism is configured to lock and hold the drive frame in a predetermined position, even if the locking piece cannot lock with the swing cam after the drive frame has moved, it will not lock. The cam plate is brought into contact with the stopper seat by the drive shaft that rotates using the drive of the electric motor, and the drive frame is slightly moved in the direction of movement, so that the locking piece can be securely locked to the swing cam. . Moreover, as mentioned above, the drive frame can be reliably locked and held in the position after it has been moved, so if the drive frame is not properly locked, the energy storage mechanism will not function properly when the switching switch is switched. This can reliably prevent the current limiting resistor from burning out or causing a power outage accident.

As a result, it is possible to provide an energy storage mechanism for an on-load tap switching device that can improve the reliability of the switching switch and extend its electrical and mechanical life.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-section and a cross-sectional view of a switching switch for an on-load tap changer equipped with the energy storage mechanism of the present invention, Fig. 2 is a plan view, and the third circle is a cross-sectional view taken along line 8-Δ in Fig. 1. , Figure 4 is the same <
A sectional view taken along the line B-B, Figures 5 and 6 are a cross-sectional view and a plan view of the main parts showing the energy storage state of the energy storage spring, and Figures 7 and 8 show the energy storage state of the energy storage spring. FIG. 9 is a plan view and a cross-sectional view of the main part showing the state after the drive frame has moved rapidly, FIG. 9 is a plan view showing the main part of the conventional energy storage mechanism, and FIG. 10 is a longitudinal cross-sectional view of the same. 33・Drive frame 37・Storage spring, 118・Eccentric disk 50・Latching cam plate 52a, 52
1)-Stopper seat 83/drive shaft License applicant Aichi Electric Co., Ltd.○ \j (O ○0)

Claims (1)

[Claims] The drive shaft is directly connected to an eccentric disk, and the eccentric disk is rotatably mounted on a drive frame which has a built-in energy storage spring capable of storing energy and is slidably attached to a guide shaft. A horizontally elongated locking cam plate that rotates together with the eccentric disk is mounted on the eccentric disk, and a pair of locking cam plates that come into contact with and separate from the locking cam plate are arranged on the longitudinal extension of the locking cam plate. A stopper seat is disposed on the drive frame, and when the drive frame moves to a predetermined position due to the stored force of the storage spring, the locking cam plate comes into contact with the corresponding stopper seat to move the drive frame to the fixed position. A power storage mechanism for a tap changer on load, characterized in that the power storage mechanism is configured to be latched and held at the load.