JP6084505B2 - Energy storage device for on-load tap changer - Google Patents

Description

  The present invention relates to an energy storage device for an on-load tap changer.

  The on-load tap changer is used for changing the tap of a transformer, and the energy storage device is provided to perform the tap change in a short time. With reference to FIGS. 9-11, the energy storage apparatus (nonpatent literature 1) used for the conventional load tap changer is demonstrated.

  As shown in FIGS. 9A to 9C, the energy storage device 10 includes an input shaft 11 having one end connected to an electric operation mechanism (not shown). The other end of the input shaft 11 is connected to an eccentric cam 12 provided on the same axis, and transmits a driving force from the electric operation mechanism.

  The eccentric cam 12 receives the rotation of the input shaft 11 and performs an eccentric operation. The eccentric cam 12 is disposed between a pair of guide plates 13 a and 13 b provided on the upper surface of the winding case 13. The winding case 13 is supported so as to be linearly movable with respect to a pair of spring guide shafts 34 laid in parallel to each other with respect to a pair of support members 30 spaced apart from each other. The winding case 13 reciprocates linearly by the guide plates 13a and 13b that have received the eccentric operation of the eccentric cam 12. The accumulator spring 14 is wound around the spring guide shaft 34 and accumulates energy by linear movement of the winding case 13.

  A pair of case guide shafts 32 are installed on the support member 30 in parallel with the spring guide shafts 34. The accumulating case 15 is supported so as to be linearly movable with respect to the case guide shaft 32, and the accumulating spring 14 performs a reciprocating linear movement by releasing the accumulating force.

  The switching crank 16 is operatively connected to the accumulating case 15 and rotates when the accumulating case 15 reciprocates due to the accumulating force of the accumulating spring 14 to perform tap switching in a not-shown shut-off mechanism. .

  The latches 18 and 19 are engaged with engaging claws 20 and 21 provided on the switching crank 16, and temporarily hold the switching crank 16 and the energy storage case 15 while the energy storage spring 14 is stored. I try to restrain it.

The operation of the energy storage device 10 at the time of tap switching is performed as follows.
FIGS. 9A to 9C show a state before the tap switching of the energy storage device 10, and in this state, when a switching signal is input to the electric operation mechanism, the input shaft 11 passes through the eccentric cam 12. Then, the winding case 13 is moved linearly. In this state, the energy storage case 15 is restrained by engaging the latch 19 and the engaging claw 21 of the switching crank 16. For this reason, as shown in FIGS. 10A to 10C, the accumulator spring 14 is accumulated by the linear movement of the winding case 13.

  When the release portion 13c provided in the winding case 13 operates the latch 19 to disengage the latch 19 from the engagement claw 21, the restraint of the energy storage case 15 is released. Then, the energy storage case 15 is moved in the direction of the winding case 13 by the energy storage force of the energy storage spring 14. This movement is performed at a high speed by the stored energy.

  As shown in FIG. 9C, when the switching crank 16 is located at the final arrival position, the switching crank 16 comes into contact with one of the dampers 35 and 36 provided on the support member 30. .

  Further, when the energy storage case 15 reaches the final arrival position, it becomes as shown in FIGS. When the switching crank 16 is located at the final position, the latch 18 is engaged with the engaging claw 20 of the switching crank 16 and the energy storage case 15 is restrained again. Further, the hoisting case 13 is driven by the eccentric cam 12 at the end of the rotation of the input shaft 11 and moves to the final reaching position, thereby completing the switching operation.

The operation of the energy storage device 10 at the next tap switching is not described in detail, but is as follows.
When a switching signal is input to an electric operation mechanism (not shown), the input shaft 11 moves the hoisting case 13 from the state shown in FIGS. The spring 14 is stored. Then, the latch 18 and the engagement claw 20 are disengaged by the release portion 13c. Then, the energy storage case 15 is moved by the energy storage force of the energy storage spring 14, and the latch 19 and the engaging claw 21 are engaged. The winding case reaches the final position and completes the switching operation. Further, the switching crank 16 contacts the other damper 35.

DAIHEN Co., Ltd. “Load Tap Changer OTMRM III Type 5” Instruction Manual Cat. No. 40536E

  The accumulator spring 14 of the conventional accumulator 10 is constituted by a single coil spring. In the case of a single coil spring, the stored torque is adjusted by replacing the coil spring with a different elastic force.

  When a coil spring having a large elastic force is used, the stored torque is increased as a whole, or when a coil spring having a low elastic force is used, the stored torque is reduced as a whole. As a result, the torque is increased even at a location that is not originally required as the stored torque, or is decreased at a location that is originally required as the stored torque. For this reason, the balance between the load torque and the stored torque of the on-load tap changer is lost, and when the stored torque is adjusted with a single coil spring, it becomes difficult to control the switching speed.

  For example, if the balance is lost, such as when the load torque required to operate the on-load tap changer is higher than the stored torque, the switching operation will not operate normally and will stop in the middle of switching. Become.

On the other hand, as an example in which the stored torque is too large than the load torque, there is a possibility that the time required for arc interruption cannot be secured.
The difficulty in controlling the switching speed is due to the temporal balance of load torque in the on-load tap changer. For example, when a large torque is required as the load torque at the end of switching, or when a large torque is required in the initial movement, the timing as the load torque changes depending on the content configuration (component arrangement) of the on-load tap changer. Although it is necessary to make the stored torque correspond to them, it is difficult to adjust the stored torque with a single coil spring.

  The object of the present invention is to easily adjust the elastic force by a plurality of elastic members, and the accumulated torque required at the end of the accumulated release is driven by a single coil spring as in the prior art, An object of the present invention is to provide an energy storage device for an on-load tap changer capable of increasing the energy storage torque at the time of initial energy storage release when the energy storage torque at the time of initial energy storage release is insufficient.

  In order to solve the above problems, a winding case that reciprocates linearly in response to rotation of an input shaft that rotates about an axis, a power storage spring portion that stores power by the winding case, and the power storage spring The accumulating case that reciprocates linearly by the accumulating force of the part and the switching crank that reciprocates in response to the reciprocating linear movement of the accumulating case, and transmits the rotational force of the switching crank to the on-load tap changer In the energy storage device of the on-load tap changer, the energy storage spring portion includes a first elastic member and a second elastic member that are energy-accumulated together when energy is stored by the hoisting case, and the energy storage spring portion stores energy. During the movement period in which the energy storage case moves due to the force, the first elastic member continues after the first movement period and the first movement period due to the release of both energy storage forces of the first elastic member and the second elastic member. The solution of energy storage by only It is intended to include a second moving period by.

The first elastic member may be a large-diameter coil spring, and the second elastic member may be a small-diameter coil spring that is coaxially disposed in the first elastic member.
A plurality of second elastic members may be arranged in the first elastic member.

  According to the present invention, the elastic force can be easily adjusted by a plurality of elastic members, and the accumulated torque required at the end of the accumulated release is driven by a single coil spring as in the prior art, When the energy storage torque at the time of initial energy storage release is insufficient, the energy storage torque at the time of initial energy storage release can be increased. Further, according to the present invention, since the first elastic member and the second elastic member can be combined in various ways, when the stored torque is adjusted, the switching speed can be easily controlled.

The side view of the energy storage apparatus of the tap switch at the time of load of one Embodiment. Sectional drawing of the energy storage apparatus of the tap switch at the time of load of one Embodiment. (A) is a top view of the state before tap switching of the energy storage device of one Embodiment, (b) is a top view of the switching crank of the state before tap switching similarly, and its periphery structure. (A) is a top view in tap switching of the energy storage device of one embodiment, (b) is a plan view of the switching crank and its peripheral configuration in the same manner tap switching. (A) is a top view in tap switching of the energy storage device of one embodiment, (b) is a plan view of the switching crank and its peripheral configuration in the same manner tap switching. (A) is a top view at the time of tap change completion of the energy storage device of one embodiment, (b) is also a plan view of the change crank at the time of tap change completion and its peripheral configuration. (A) is principal part sectional drawing at the time of the energy release of an energy storage spring part, (b) is principal part sectional drawing at the time of the energy storage of an energy storage spring part. Explanatory drawing of a 1st movement period and a 2nd movement period. (A) The principal part side view of the state before the tap change of the energy storage device of a prior art example, (b) is the top view of the state before the tap change of the energy storage device, (c) is the switching crank before the tap change. FIG. (A) is a side view of a main part of the conventional energy storage device during tap switching, (b) is a plan view of the energy storage device during tap switching, and (c) is a switching crank during tap switching and its peripheral configuration. FIG. (A) is a side view of the main part when tap switching of the accumulator of the conventional example is completed, (b) is a plan view when tap switching of the accumulator is completed, and (c) is a switching crank when tap switching is completed. The top view of the periphery structure.

  Hereinafter, an energy storage device for an on-load tap changer according to an embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and demonstrated about the same or equivalent structure as the said prior art example.

  As shown in FIGS. 1 and 2, the energy storage device 10 includes an input shaft 11 having one end connected to the electric operation mechanism 100 and rotating around an axis. The other end of the input shaft 11 is connected to an eccentric cam 12 provided on the same axis, and transmits a driving force from the electric operation mechanism 100.

  The eccentric cam 12 receives the rotation of the input shaft 11 and performs an eccentric operation. A rotating shaft 12 a of the eccentric cam 12 is penetrated from below to above the winding case 13 and is connected to the input shaft 11. As shown in FIG. 2, the eccentric cam 12 is disposed in the winding case 13 between a pair of guide plates 13 a and 13 b provided on the lower surface of the winding case 13.

  As shown in FIG. 2, a fixing plate 29 is disposed below the case 13, and a pair of support members 30 are fixed to the upper surface of the fixing plate 29. A pair of spring guide shafts 34 provided in parallel to each other is provided between the support members 30, and the winding case 13 is supported so as to be linearly movable with respect to the spring guide shaft 34. The winding case 13 reciprocates linearly by the guide plates 13a and 13b that have received the eccentric operation of the eccentric cam 12. As shown in FIG. 3, in the present embodiment, an energy storage spring portion 140 is provided instead of the conventional energy storage spring 14. Details of the energy storage spring part 140 will be described later.

The accumulating spring part 140 is provided on the spring guide shaft 34 and accumulates energy by linear movement of the winding case 13.
A pair of case guide shafts 32 are installed between the support members 30 in parallel with the spring guide shafts 34. The accumulating case 15 is supported so as to be linearly movable with respect to the case guide shaft 32, and reciprocates linearly by releasing the accumulating force of the accumulating spring part 140.

  As shown in FIG. 1, a switching crank 16 that is rotatably supported with respect to the fixed plate 29 is disposed below the energy storage case 15. In FIG. 2, the illustration of the switching crank 16 is omitted for convenience of explanation.

  A pair of cam members 15a project from the lower surface of the energy storage case 15, and a cam follower 16a provided on the upper surface of the switching crank 16 is engaged between the cam members 15a. The cam follower 16 a rotates the switching crank 16 by the reciprocating linear movement of the energy storage case 15. The switching crank 16 is rotated by the accumulating force of the accumulating spring part 140 and performs tap switching of the tap changer in the shut-off mechanism part 120.

  As shown in FIG. 3B, the switching crank 16 is formed with engaging claws 20 and 21 at each end in the reciprocating rotation direction. A pair of latches 18 and 19 are rotatably supported on the upper surface of the fixed plate 29. The latches 18 and 19 have engaging arms 18a and 19a that engage with the engaging claws 20 and 21, respectively, and release arms 18b and 19b. Although not shown, a tension spring is hung between the latches 18 and 19 to urge the engaging arms 18a and 19a toward the switching crank 16 side.

  The engaging arms 18a and 19a of the latches 18 and 19 are engaged with the engaging claws 20 and 21, and the switching crank 16 and the accumulating case 15 are temporarily suspended while the accumulating spring portion 140 is accumulating. To be restrained.

  As shown in FIG. 1, the winding case 13 is provided with a release portion 13 c that releases the engagement between the engagement arms 18 a and 19 a and the engagement claws 20 and 21. When the winding case 13 is linearly moved, the release portion 13c abuts on the release arms 18b and 19b of the engagement arms 18a and 19a that restrain the switching crank 16 and operates in the release direction, thereby causing the engagement arm 18a. , 19a and the engaging claws 20, 21 are disengaged.

  As shown in FIGS. 3B, 4B, and 5B, a damper 40 is formed on the fixed plate 29. As shown in FIG. The damper 40 is disposed so as to be positioned on the rotation locus of the switching crank 16. A pair of pins 44 and 45 for receiving respective end portions of the switching crank 16 at the time of impact are inserted into both ends of the casing 43 of the damper 40 so as to be movable in the longitudinal direction.

Next, the details of the accumulator spring portion 140 will be described with reference to FIGS.
The accumulator spring part 140 includes a single coil spring 143 wound around the spring guide shaft 34, a pair of spring receivers 141 and 142 that receive each end of the coil spring 143 and penetrate the spring guide shaft 34, A guide member 145 slidably passed through the spring guide shaft 34 and coil springs 146 and 147 disposed between the guide member 145 and the spring receivers 141 and 142 are included. The coil spring 143 is constituted by a cylindrical coil spring.

  As shown in FIG. 7A, tubular members 148 and 149 that slidably penetrate the spring guide shaft 34 are fixed to the guide plates 13a and 13b. As shown in FIGS. 1, 7A and 7B, when the winding case 13 and the energy storage case 15 move relative to each other, the guide plate 13a and the wall portion 15b of the energy storage case 15, and The guide plate 13b and the wall portion 15c of the energy storage case 15 are formed so as not to interfere with each other.

  When the guide plate 13a is located closer to the spring receiver 141 than the wall portion 15b (for example, in the state shown in FIGS. 4A, 5A, and 6A), The spring receiver 141 can be locked to the tubular member 148 of the guide plate 13a. In addition, when the wall 15b is located closer to the spring receiver 141 than the guide plate 13a (for example, in the state shown in FIG. 3), although not shown, the spring receiver 141 is relative to the wall 15b. It can be locked.

  When the guide plate 13b is located proximal to the wall portion 15c with respect to the spring receiver 142 (for example, in the state shown in FIGS. 2 and 7A), the spring receiver 142 is a tubular shape of the guide plate 13b. The member 149 can be locked. When the wall 15c is positioned closer to the spring receiver 142 than the guide plate 13b (for example, in the state shown in FIG. 7B), the spring receiver 142 is engaged with the wall 15c. It can be stopped.

  The guide member 145 has a through-hole 145a having a slightly larger diameter than the spring guide shaft 34 at the center in the axial direction. The guide member 145 is movable in the axial direction with respect to the spring guide shaft 34 when the spring guide shaft 34 is slidably inserted into the through hole 145a.

  The coil springs 146 and 147 are formed in a cylindrical shape having a smaller diameter than the coil spring 143, and are wound around the spring guide shaft 34 so as to be coaxial with the coil spring 143.

  Further, when the coil springs 146, 147 and the coil spring 143 are both compressed by the relative movement of the winding case 13 and the energy storage case 15, the energy stored in the coil springs 146, 147 is the two energy storage torques. Are simultaneously released, the coil springs 146 and 147 are configured such that the stored torque becomes zero earlier than the coil spring 143. That is, even after the accumulated torque of the coil springs 146 and 147 becomes 0 in this way, the coil spring 143 continues to release the accumulated torque and expands, as shown in the example of FIG. The lengths of the coil springs 146 and 147 are set so as to be separated from the guide member 145 or separated from the spring receivers 141 and 142. The size of the coil springs 146 and 147 and the stored torque can be set to be the same, but may be set to be different according to the load torque of the on-load tap changer.

The coil spring 143 corresponds to a first elastic member, and the coil springs 146 and 147 correspond to a second elastic member.
(Operation of the embodiment)
Operation | movement at the time of tap switching of the energy storage apparatus 10 of this embodiment is performed as follows.

3A and 3B show a state before the tap switching of the energy storage device 10. At this time, as shown in FIG. 7A, the energy storage spring portion 140 is in a state before energy storage.
In this state, when a switching signal is input to the electric operation mechanism 100, the input shaft 11 shown in FIG. 1 moves the winding case 13 linearly via the eccentric cam 12. In this state, the energy storage case 15 is restrained by engaging the latch 19 and the engaging claw 21 of the switching crank 16 as shown in FIG. Therefore, as shown in FIGS. 4A, 4B, and 7B, the accumulating spring portion 140 is accumulated by the linear movement of the winding case 13. In the example of FIG. 4A, since the energy storage case 15 is restrained in the drawing, the coil spring 143 is compressed between the spring receivers 141 and 142 by the movement of the guide plate 13a to the right side, and the coil The springs 146 and 147 are compressed between the spring receiver 141 and the guide member 145 and between the guide member 145 and the spring receiver 142.

  Then, as shown in FIGS. 4A and 4B, the release portion 13c provided in the winding case 13 is brought into contact with the release arm 19b to be operated. As a result, the latch 19 is rotated and the engagement between the latch 19 and the engaging claw 21 is released, and the restraint of the energy storage case 15 is released.

  Then, as shown in FIGS. 5A and 5B, the accumulating case 15 moves in the direction of the hoisting case 13 by the accumulating force (accumulating torque) of the coil springs 143, 146 and 147 of the accumulating spring portion 140. Let This movement is performed at a high speed by the stored energy.

  FIG. 8 shows a change in the stored torque from the time t when the restraint of the stored case 15 is released to t = 0 to t2. A two-dot chain line A indicates the total stored torque of the coil springs 146, 147, a dotted line B indicates the stored torque of the coil spring 143, and a solid line C indicates the total stored torque of the coil springs 143, 146, 147. Show.

  The period from t = 0 to t1 is the first movement period τ1, and during this period, as shown by the solid line C (= A + B), the stored torque of the stored spring 140 decreases with time. Further, t1 to t2 is a second movement period τ2, and during this period, the accumulated torque of the accumulation spring part 140 decreases with the passage of time as shown by the dotted line B (= C). The second movement period is a period in which the stored torque of the coil springs 146 and 147 is 0, and the stored case 15 moves with the stored torque of only the coil spring 143.

As shown in FIG. 6B, when the switching crank 16 is located at the final arrival position, the switching crank 16 comes into contact with the pin 44 of the damper 40 and is buffered by the damper 40.
Further, as shown in FIG. 6B, when the switching crank 16 is located at the final arrival position, the latch 18 is engaged with the engaging claw 20 of the switching crank 16, and the energy storage case 15 is restrained again. Further, the winding case 13 is driven by the eccentric cam 12 at the end of the rotation of the input shaft 11 and moves to the final position to complete the tap switching.

The operation of the energy storage device 10 at the next tap switching is not described in detail, but is as follows.
When a switching signal is input to the electric operation mechanism 100, the input shaft 11 moves the winding case 13 from the state shown in FIGS. 6A and 6B toward the latch 18 via the eccentric cam 12, thereby accumulating energy. The spring part 140 is stored. Then, the latch 18 and the engagement claw 20 are disengaged by the release portion 13c. Then, the energy storage case 15 is moved by the energy storage force of the energy storage spring portion 140, and the latch 19 and the engaging claw 21 are engaged. The winding case reaches the final position and completes the switching operation. At this time, the switching crank 16 abuts on the pin 45 of the damper 40 and is buffered by the damper 40.

The energy storage device 10 according to the present embodiment has the following characteristics.
(1) The energy storage device 10 according to this embodiment includes an input shaft 11 that rotates about an axis, a winding case 13 that receives the rotation of the input shaft 11 and performs a reciprocating linear movement, and the winding case 13 stores energy. An accumulating spring portion 140, an accumulating case 15 that reciprocates linearly by the accumulating force of the accumulating spring portion 140, and a switching crank 16 that reciprocally rotates in response to the reciprocating linear movement of the accumulating case 15. The rotational force of the switching crank 16 is transmitted to the on-load tap changer. The accumulating spring portion 140 includes a coil spring 143 (first elastic member) and coil springs 146 and 147 (second elastic member) that are accumulated together when the hoisting and accumulating case 15 stores energy. Furthermore, during the movement period in which the energy storage case 15 is moved by the energy stored in the energy storage spring portion 140, both energy storage forces of the coil spring 143 (first elastic member) and the coil springs 146, 147 (second elastic member) are used. The first movement period τ1 due to the release of the first movement period and the second movement period τ2 following the first movement period τ1 and the release of the stored force only by the coil spring 143 (first elastic member) are included.

  As a result, according to the present embodiment, the elastic force can be easily adjusted by the plurality of elastic members, and the accumulated torque required at the end of the accumulated release is the single coil spring as in the conventional case. When the stored torque at the time of the initial release of energy storage is insufficient, the stored torque at the time of the initial release of energy storage can be increased. Further, according to the present embodiment, since the coil spring 143 (first elastic member) and the coil springs 146 and 147 (second elastic member) can be combined in various ways, the switching speed is controlled by adjusting the stored torque. Can be made easier.

  In addition, since the stored force of the second elastic member is 0 during the second movement period when the stored energy is released, the overall characteristic torque does not increase, and the first movement in which the second elastic member is acting. The stored torque can be increased only during the period.

  Furthermore, in the conventional technology, since it is impossible to exceed only the load torque position of the on-load tap changer that is originally intended to be exceeded with one spring, it is necessary to increase the total stored torque, but there are multiple springs ( For example, in the present embodiment, it is possible to increase the stored torque only by the time position of the load torque that is desired to be exceeded by setting the number to 6), so that unnecessary stored power is not required.

  (2) In the energy storage device 10 of the present embodiment, the coil spring 143 as the first elastic member is a large-diameter coil spring, and the coil springs 146 and 147 as the second elastic member are coaxial with the coil spring 143. The diameter was made small so as to be arranged. As a result, according to the present embodiment, since the second elastic member can be accommodated in the first elastic member, the second elastic member can be assembled to the winding case 13 having the same size as the conventional one, and the size is not increased.

  (3) In the energy storage device 10 of the present embodiment, two coil springs 146 and 147 (second elastic members) are arranged in the coil spring 143. As a result, the coil springs 146 and 147 can be combined with different specifications, and when the stored torque is adjusted, the switching speed can be easily controlled.

In addition, this invention is not limited to the said embodiment, You may comprise as follows.
The first elastic member and the second elastic member are not limited to a cylindrical coil spring having the same diameter in the axial direction, and may be a conical coil spring, for example, and the shape of the coil spring is not limited.

  -In the said embodiment, although the magnitude | size of the coil springs 146 and 147 and the said stored torque were set so that it might become the mutually same, it does not limit so that it may become the same magnitude | size and the same stored torque. The on-load tap changer has various specifications, and the load torque and the switching speed are also different. Therefore, the magnitudes and stored torques of the coil springs 146 and 147 may be different from each other and different stored torques according to the load torque and switching speed of the on-load tap changer. Also in this case, the coil springs 146, 146 and 147 are released earlier than the coil springs 143 when the stored torques of the coil springs 143 and 146, 147 are simultaneously released. The specification of 147 may be set. Moreover, you may adjust so that release | release of the stored torque of either one of the coil springs 146 and 147 may be completed at an early stage according to the load torque of the on-load tap changer and the required switching speed.

  As shown in FIG. 8, in the above-described embodiment, the maximum stored torque of the coil spring 143 (value immediately before the stored torque is released: t = 0) is used as the maximum stored torque of the coil springs 146 and 147. Although it is set to be larger than (a value immediately before the stored torque is released: t = 0), it is not limited to such a case.

  For example, the maximum stored torque of the coil spring 143 (value immediately before the stored torque is released: t = 0) is changed to the total maximum stored torque of the coil springs 146 and 147 (immediately before the stored torque is released). The value may be set smaller than (value: t = 0). Also in this case, the coil spring 146 is arranged such that when the stored torque of the coil spring 143 and the coil springs 146, 147 are released simultaneously, the release of the stored torque of the coil springs 146, 147 is terminated earlier than the coil spring 143. , 147 specifications are set.

  In the above embodiment, the coil springs 146 and 147 are disposed in the coil spring 143. However, a spring guide shaft similar to the spring guide shaft 34 is disposed in parallel to the spring guide shaft 34 outside the coil spring 143. The spring guide shaft may be provided with coil springs 146 and 147 and a guide member 145.

  Any one of the coil springs 146 and 147 as the second elastic member can be omitted. Also in this case, when the stored torque of the coil spring 143 as the first elastic member and the stored spring of the coil spring as the second elastic member are simultaneously released, the release of the stored torque of the coil spring as the second elastic member is the coil spring 143. It is assumed that the specification of the coil spring as the second elastic member is set so as to be terminated earlier.

  -It is also possible to provide three or more coil springs as the second elastic member. Also in this case, when the stored torques of the coil spring 143 as the first elastic member and the three or more coil springs as the second elastic member are released simultaneously, the stored torque of the coil spring as the second elastic member is released. Suppose that the specification of the coil spring as the second elastic member is set so as to end earlier than the coil spring 143.

  In the embodiment, the first elastic member is a single coil spring 143, but the first elastic member may be a double coil spring inside and outside. That is, the inner and outer double coil springs may be used as the first elastic member, and the second elastic member may be disposed in or in parallel therewith.

10 ... Energy storage device, 11 ... Input shaft, 12 ... Eccentric cam, 13 ... Winding case,
15 ... Energy storage case, 16 ... Switching crank,
140 ... accumulating spring part, 143 ... coil spring (first elastic member),
145 ... guide member, 146,147 ... coil spring (second elastic member),
τ1: first movement period, τ2: second movement period.

Claims (3)

A hoisting case that reciprocates linearly in response to rotation of an input shaft that rotates around an axis, an accumulating spring portion that accumulates energy by the hoisting case, and an accumulating force of the accumulating spring portion, An accumulator case for movement and an accumulator for a load tap changer that includes a switching crank that reciprocally rotates in response to a reciprocating linear movement of the accumulator case, and that transmits the rotational force of the switching crank to the load tap changer In the device
The accumulating spring portion includes a first elastic member and a second elastic member that are accumulated together when accumulating by the winding case,
In the moving period in which the accumulating case moves due to the accumulating force of the accumulating spring part, the first moving period and the first moving period due to the release of both accumulating forces of the first elastic member and the second elastic member An energy storage device for an on-load tap changer that follows and includes a second movement period by releasing an energy storage force only by a first elastic member.   2. The on-load tap according to claim 1, wherein the first elastic member is a large-diameter coil spring, and the second elastic member is a small-diameter coil spring disposed coaxially in the first elastic member. Energy storage device for switcher.   The accumulator of the on-load tap changer according to claim 2, wherein a plurality of the second elastic members are arranged in the first elastic member.