CN203312051U

CN203312051U - Preselector actuating device used in preselector in tap switch

Info

Publication number: CN203312051U
Application number: CN2012205468404U
Authority: CN
Inventors: K·胡尔蒂格
Original assignee: ABB T&D Technology AG
Current assignee: ABB Technology AG
Priority date: 2011-10-20
Filing date: 2012-10-22
Publication date: 2013-11-27
Anticipated expiration: 2022-10-22
Also published as: EP2584576A1; CN103065819B; EP2584576B1; CN103065819A

Abstract

The utility model relates to a preselector actuating device used in a preselector in a tap switch of a transformer. The device comprises a drive input component (11) which is configured to perform an input movement stroke of a predetermined length. The device further comprises a preselector arm (51) which is configured to perform a preselector stroke from a first contact to a second contact. A movement transmission mechanism which is connected to the drive input component (11) and the preselector arm (51) is comprised. According to the utility model, the movement transmission mechanism is configured to convert the input movement stroke such that the preselector stroke obtains a movement pattern having an initial period of relatively slow movement, an intermediate period of relatively fast movement and an end period of relatively slow movement. The utility model also relates to a tap switch having such a device and a transformer provided with such a tap switch.

Description

The preselector actuating device that is used for the preselector of shunting switch

Technical field

The utility model relates to the preselector actuating device for the preselector of the shunting switch of transformer, and this device comprises: drive input block, be configured to carry out the input motion stroke of predetermined length; The preselector arm, be configured to carry out the preselector stroke from the first contact to the second contact; And movement transferring, be connected to and drive input block and preselector arm.

The utility model also relates to shunting switch and transformer.

Background technology

Shunting switch usually with being connected of transformer in use, in order to change its transfer ratio.In having the transformer of shunting switch, a winding in transformer has the number of turn of the fixed qty that is connected to circuit.Another winding has a fixing tie point, and another tie point can be from selecting to obtain required voltage a plurality of points.Selectable point can be after winding partly be positioned at each other, and this winding part is corresponding to 70% to 100% of this winding full extension.

After being connected to the load variations of transformer or due to other influencing factor, may need to change tie point.The needs that change tap point trigger automatically in response to sensor parameter usually.Tap changes and to comprise that multiple manipulation, this manipulation comprise and open and close switch (for example,, by being loaded with the spring of accumulator) and the new tie point of moving to of selector arm.These manipulations must be carried out and carry out in the certain hour relation according to a definite sequence.

Tap changes manipulation and comprises that connection is changed to adjacent connection from a tie point reveals.This is to carry out by the preselector arm, and this preselector arm foundation contacts with corresponding contact point.The illustrative examples that activates the preselector arm is disclosed in DE26202011, EP2256769 and US2009/0211890.

In the device of DE26202011, provide the auxiliary contact at high-voltage level, in order to when preselector disconnects from first make contact, reduce the generation of electric arc.In EP2256769, a pair of spring action in the preselector arm to obtain contact separation fast, in order to extinguish rapidly the electric arc of generation.

The utility model content

With common constant speed and the Li Lai of selector arm, realize the actuating according to the preselector of the prior art in common and above-mentioned example.This actuating movement comprise from starting contact point disconnect, mobile and contact another contact point, yet this actuating movement is not far best because in the different phase of motion, its speed/strength is had to different requirements.

The purpose of this utility model is to obtain a kind of preselector actuating device, and it optimizes the motor pattern of preselector arm.

This purpose is that the preselector actuating device of describing in the introduction due to specification is realized, this preselector actuating device comprises following specific features: movement transferring is configured to change the input motion stroke, makes the preselector stroke obtain having mid-term and the relative slowly motor pattern in the latter stage of motion of the initial stage of relatively slowly motion, relative rapid movement; Wherein drive input block and comprise the rotating element that rotation input motion stroke is provided, and the preselector arm is rotatable; Further, movement transferring comprises the actuating arm and the pivotable pitman arm that is connected to the preselector arm around rotation, and this actuating arm has the joint unit that is configured to act on pitman arm.

Therefore realized in the adaptation of the stages moved to the motor pattern of difference requirement.Beginning in motion, need to have relatively strong power in order to overcome the high stiction between contact.After contact separation, expectation has relatively high movement velocity in order to reduce condenser type breaking time.Higher speed at interim period meets this requirement.Lower speed during latter stage means and will enter fixed contact with low velocity, and this has reduced the risk of bounce-back.When entering fixed contact, predetermined motor pattern also will help to obtain tuning period.

The preselector arm of rotation is the modal type of preselector.Therefore, according to the device of this execution mode, can be widely used and in design, there is no other variations.With other type of sports such as linearity, compare, provide the transmission of the Move Mode that causes appointment also simpler.

According to further preferred implementation, the initial stage means the 5%-20% of preselector stroke, and means the 5%-20% of preselector stroke latter stage.

During initial stage and latter stage respectively in these scopes of the scope that usually meets the demands of stages corresponding to in motion.In many cases, the optimum duration in each initial stage and latter stage is about 10%, namely in the scope of 8%-12%.

According to further preferred implementation, the preselector arm the average speed of interim period at least up to the preselector arm in the early stage with each of latter stage during the twice of average speed.

Benefit from advantage of the present utility model, common expectation has the high velocity contrast during difference.Yet difference is larger, movement transferring is had to more complicated.Lower restriction for the velocity contrast according to present embodiment is enough to obtain this advantage on significance degree.Preferably, velocity contrast is still larger, make the speed between intergrade be in the early stage with latter stage during at least 3 times of speed.During initial stage and latter stage during speed do not need identical.On the contrary, preferably in the scope of the 30%-60% of the speed of speed during latter stage during the initial stage.

By these arms, can use about the relatively simple mechanical measure of the cooperation of these arms and can realize the special exercise pattern.

According to further preferred embodiment, joint unit comprises the first docking unit and the second docking unit, this docking unit is attached to the different radial position of actuating arm, and in linking arm, has the cam face parts that are configured to dock with each unit matching.

Provide two such docking unit that coordinate from the cam face parts to help obtain different speed.Preferably, the docking unit in the outside is by following radius setting, and this radius is in the 2-3 of the radius of the setting of docking unit, inboard scope doubly

According to further preferred embodiment, each joint unit is roller.

Therefore, obtain contacting with the rolling of cam face device, it reduces wear and friction loss.The contact of rolling also produces higher accuracy and reliability.

According to further preferred embodiment, the cam face component configuration contacts with the docking unit of radially inner side during in the early stage, and contacts with the docking unit of radial outside at interim period with during latter stage.

Because the bar distance of the docking to radially inner side is relatively short, so the power of transmitting will be relatively low by relatively high and speed.Therefore, in simple mode, realized that high power is with the stiction between the contact that overcomes the preselector arm and will brake.

According to further preferred embodiment, the cam face parts comprise and are configured to the second cam part device that docks the first cam portion parts of unit matching with first and be configured to dock with second unit matching.

Therefore, realized the simple and suitable adaptation of the setting of cam face parts to two a docking unit.

According to further preferred embodiment, the first cam portion parts are positioned at pivotal axis from described pitman arm than the larger radial distance of described the second cam portion parts.

The still cam face parts adaptation that is oppositely arranged of this cam portion coordinates with the simple structures of two docking unit, and causes smooth transfer.

According to further preferred embodiment, the first cam portion parts comprise that at least one has the cam section of concave arc shape, and radially extending of the second cam portion parts is the twice of radially extending of described at least one cam section at least.

These features make the cam face parts also be further adapted for the steady of docking unit of actuating arm in simple mode to coordinate.

According to further preferred embodiment, driving that input unit is configured to can be in rotation on any one direction with for the described preliminary election arm of rotation on any one direction.

Tap from a contact point to adjacent contacts changes may expect one of two adjacent contact points that are positioned at opposite side.This needs the preselector arm to move in either direction.By this execution mode, with identical transferring elements, make it become possibility without any need for further construction package by one.

According to further preferred embodiment, the second cam portion has U-shaped, the cam face parts are about with the symmetry that rolls off the production line, the bottom perpendicular to U-shaped the second cam portion parts is intersected in the centre of this line and U-shaped the second cam portion parts, and the first cam portion parts comprise two cam section of the every side that is positioned at U-shaped the second cam portion parts, and this cam section is except being of similar shape mirror image each other.

This execution mode is particularly suitable for allowing the preselector arm to move in either direction.The symmetry of cam face parts guarantees the same movement pattern in either direction.Thereby the second cam portion parts of U-shaped are movable on either direction, and each in two cam section is only movable in one direction.

The purpose of this utility model is further opened realization by a kind of decomposition switch, and this shunting switch comprises according to the utility model particularly according to its preselector actuating device the purpose of this utility model of arbitrary preferred implementation also by realizing a kind of comprising according to the transformer of shunting switch of the present utility model.

Shunting switch of the present utility model and transformer from preselector arm actuating device of the present utility model with and preferred embodiment advantage benefit, described advantage is described above.

Described above of the present utility modelly preferred embodiment indicate at dependent claims.Be appreciated that certainly any possible combination that can be by these above-mentioned execution modes and construct further preferred embodiment by any possible combination of the feature described in the explanation of these and example below.

By the following detailed description of the utility model example and with reference to accompanying drawing, further explain the utility model.

The accompanying drawing explanation

Fig. 1 a-Fig. 1 c has schematically shown the shunting switch that is suitable for device of the present utility model;

Fig. 2 is the perspective view according to movement transferring of the present utility model;

Fig. 3 is the plane graph of the part of movement transferring shown in Figure 2, and shows the mechanism in original position;

Fig. 4-Fig. 8 is the diagram corresponding to the diagram of Fig. 3, shows the mechanism of the different successive stages that transmit in motion;

Fig. 9 is the plane graph corresponding to the diagram of Fig. 3, shows in the mechanism of position endways;

Figure 10 shows the curve chart according to the motor pattern of preselector arm of the present utility model.

Embodiment

Fig. 1 a-Fig. 1 c has schematically shown shunting switch.Fig. 1 a is the single-phase figure of a class shunting switch 100 be intended for according to the utility model device.Shunting switch 100 is connected to the adjusting winding of transformer and has a different set of tap 102, and in this case, the number of tap is 16, but this number can be other, for example from 5 to 35 Arbitrary Digit.The shunting switch of Fig. 1 a is the diverter switch type, and comprises diverter switch 120 and tap selector 110.

The tap selector 110 of Fig. 1 is operating as preliminary election and selected, and therefore comprises preselector arm 51 and sampler bar, and this sampler bar comprises two arms 101 and 102.Preselector arm 51 and sampler bar be all by the operation that rotatablely moves accordingly, mobile preselector arm 51 as shown in Figure 1 b and the

mobile sampler arm

101 and 102 as shown in Fig. 1 c and Fig. 1 c.As shown in Figure 1a, when the V in diverter switch 120 or H disconnected,

sampler arm

101 and 102 motion occurred.During sampler arm 102 moved to contact 16 from contact 14, preselector arm 51 moved between 22Dao contact, contact 21.Sampler

arm

101 and 102 can be different from 8 respectively of fixed contact contact and with 51 combinations of preselector arm, whole 16 taps can be used for this thick/smart handover configurations.

Diverter switch 120 in known way has one group of circuit breaker, for example vacuum circuit-breaker.When diverter switch 120 need to transform to another tap from a tap, be that these circuit breakers open and close according to a fixed sequence.This makes selector arm 51,101 from a fixed contact, to move to adjacent fixed contact respectively.

Fig. 2 is the perspective view illustrated for the actuating device of preselector arm.Its two primary clusterings are actuating arm 10 and pitman arm 20.Actuating arm 10 is connected to maltese cross mechanism (Geneva wheel) (being meaned by axis 11 in the drawings) and forms the driving input of this device.Actuating arm 10 for example is fixedly attached to maltese cross mechanism by rivet.The part of the gearbox that maltese cross mechanism forms, the motion that the tap conversion sequential that gearbox is configured to be scheduled to provides for switching over device and tap selector.Gearbox receives and drives input from motor after tap changes instruction.The structure of gearbox can be any general type, and for the purpose of this utility model, the explanation of this gearbox is considered to unnecessary.

Pitman arm 20 via bar 30 with 40 in the driving with axle (being meaned by its axis 50 in the drawings) is connected.Axle 50 is connected to rotatable preselector arm 51 with driving.

When preselector arm 51 activated, maltese cross mechanism 11 rotation was for the certain angle of input motion stroke is provided, and this angle is slightly less than 70 ° and with constant rotary speed usually.Thereby actuating arm 10 as one man rotates with maltese cross mechanism.Pitman arm 20 is rotatable around pivotal line 21.Actuating arm 10 matches and is delivered to the latter rotatablely moving with pitman arm 20.Cooperation between these two elements makes the motor pattern of pitman arm 20 depart from a predetermined manner the motor pattern of actuating arm 10.This concrete structure by those parts that contact each other of actuating arm 10 and pitman arm 20 is realized, and 3 to 9 further detailed explanations below with reference to the accompanying drawings.

Bar 30 is rotatably connected to pitman arm and is rotatably connected to bar 40 around axis 41 around axis 31.Therefore, rotatablely moving of pitman arm 20 causes rotatablely moving accordingly of bar 40.Bar 40 is fixed to axle 50 drivenly, makes selector arm 51 as one man to rotate with bar 40.

Referring now to Fig. 3 to Fig. 9, by the motion transmission illustrated in greater detail between actuating arm 10 and pitman arm 20.

Fig. 3 shows actuating arm 10 and the pitman arm 20 of the position before motion starts.Actuating arm 10 has

joint unit

12 and 13, comprises that the docking unit 12 of radially inner side and the docking unit 13 of radial outside form.Each docking unit is roller.

Connection-rod 20 is have two

leg

22a, 22b forked, and

cam face parts

23a, 23b, 24a, 24b are set on two leg 22a, 22b.

Cam face parts

23a, 23b, 24a, 24b comprise cam portion parts 23a, the 23b of radial outside and the cam portion 24a of radially inner side, 24b.

The first

cam portion parts

23a, 23b comprise the first cam section 23a and the second cam section 23b of the outer ends of the leg 22a, the 22b that are positioned at separately.Two

cam section

23a, 23b are except being of similar shape mirror image each other.The shape of each

cam section

23a, 23b comprises around the concave arc of the centre of separately cam section.This arc may be circular arc, but the vicissitudinous radius of tool alternatively.

The

second cam portion

24a, 24b be U-shaped normally, and comprises two the identical 24a of branch, 24b, in the middle of its base section in the U-structure toward each other.In the bottom of U-structure, the

second cam portion

24a, 24b have

arc

241a, 241b, its shown in figure in be circular, but can alternatively have other arcuation.From the bottom of U-structure, the

second cam portion

24a, 24b have continuation 242a, the 242b as straight line in every side, and these lines can parallel or a little outwards be dispersed.At the outer ends place of continuation, cam surface has

corresponding protuberance

243a, 243b.

The straight line L that passes through the centre of U-structure perpendicular to bottom separates

cam part

23a, 23b, 24a, 24b symmetrically.

From the original position shown in Fig. 3, actuating arm 10 is configured to certain angle that turns clockwise, and pitman arm 20 will rotate in the counterclockwise direction accordingly.At first, actuating arm 10 moves and does not contact pitman arm 20.

After the short time period, reached the position shown in Fig. 4.Now, interior roller 12 starts to contact cam portion 23a.Connection-rod will start rotation thus, and roller 12 rolls on cam section 23a accordingly.Because the radius of roller 12 is relatively short, so that actuating force will be the speed of strong and pitman arm will be relatively low.Cooperation between roller 12 and cam section 23a means the initial stage of moving and transmitting.When separating the preselector contact, the brute force of transmitting during this period is conducive to overcome stiction.

After actuating arm 10 was further rotated, its outer roller 13 will contact with cam ring section at its part 24a place of the bottom that is close to the U-structure.Therefore drive and will complete by the cooperation of these elements.The preselector arm has left fixed contact this moment.Because the radius of roller 13 is the radiuses much larger than roller 12, so gear ratio changes and pitman arm 20 will be with very high speed rotation.This helps to increase fast the distance between motion contact and fixed contact, i.e. condenser type braking is fast.This has meaned the mid-term that motion is transmitted.

Fig. 5 shows the position of the assembly when starting this mid-term.Due to the fair speed of pitman arm 20 during this period, interior roller 12 disconnects and the contacting of cam section 23a.In this figure, this just occurs.

Fig. 6 shows the position of assembly in the later phases in mid-term.Moving a little from the centre of the bottom of U-structure in contact between roller 13 and the 24a of cam part branch, causes the speed of pitman arm 20 correspondingly to reduce.Yet this speed is still high with respect to the speed at initial stage.

Fig. 7 shows next step.After actuating arm 10 was further rotated, the contact point between outer roller 13 and the 24a of cam part branch was further outwards advanced along continuation 242a.This causes the further reduction of the speed of pitman arm 20.

Fig. 8 shows the position at the assembly in the latter stage that motion is transmitted.During latter stage, the contact point between roller 13 and cam part 24a at the latter's the very end of outside, that is, has the place of convex portion 243a.The speed of pitman arm 20 significantly reduces during this period.The contact of preselector will arrive fixed contact with low speed accordingly, to reduce the risk of bounce-back.

In Fig. 9, motion completes.Assembly has the position with the starting position symmetry shown in Fig. 3, and device has been ready to actuating movement in the opposite direction.This rightabout actuating movement is to complete by the identical mode with above-mentioned.This roller will coordinate with cam section 23b and cam part 24b then.

Figure 10 shows the curve chart of the motor pattern of the preselector arm activated by above-described device.Therefore what this figure was based on simulation is also the expression of principle, in practice, may have slightly and depart from this figure.This figure shows the speed of preselector arm with degree/second, it is as the function of the angle of preselector arm.At the initial stage from the first fixed contact braking, speed is approximately 25 degree/second.During first 10 degree of preselector arm motion, occur this period, and illustrated with respect to Fig. 4, and this motion is shifted from the interior roller 12 of actuating arm 12.

In the early stage, almost moment was increased to over 200 degree/second the speed of preselector arm 20.This situation occurs in driving from interior roller 12 to outer roller 13 while shifting.After arriving this maximum, speed drops to approximately 50 degree/second in the slow reduction of phase in mid-term.In the rotation of preselector arm, approximately after 90 degree, reach this speed.In this stage, start latter stage and continue until set up and the contacting of fixed contact in 100 degree rotations place of preselected arm.Speed during latter stage is substantially constant at 50 degree/second.This speed is enough avoided the bounce-back when preselector arm contact fixed contact.

Claims

1. actuating device of the preselector for the preselector of the shunting switch of transformer, described device comprises: drive input block (11), be configured to carry out the input motion stroke of predetermined length; Preselector arm (51), be configured to carry out the preselector stroke from the first contact to the second contact; And movement transferring, be connected to described driving input block (11) and described preselector arm (51); It is characterized in that, described movement transferring is configured to change described input motion stroke, makes described preselector stroke obtain having mid-term and the relative slowly motor pattern in the latter stage of motion of the initial stage of relatively slowly motion, relative rapid movement; Wherein said driving input block (11) comprises the rotating element that rotation input motion stroke is provided, and described preselector arm (51) is rotatable; Wherein said movement transferring comprises the actuating arm (10) rotated around described rotating element and is connected to the pivotable pitman arm (20) of described preselector arm (51), described actuating arm (10) has the joint unit (12,13) that is configured to act on described pitman arm (20).

2. preselector actuating device according to claim 1, is characterized in that, the described initial stage means the 5%-20% of described preselector stroke, and mean the 5%-20% of described preselector stroke described latter stage.

3. preselector actuating device according to claim 1, it is characterized in that, described preselector arm (51) at the average speed of described interim period at least up to described preselector arm (51) during each of described initial stage and described latter stage the twice of average speed.

4. preselector actuating device according to claim 1, it is characterized in that, described joint unit (12,13) comprise that the first docking unit (12) and second docks unit (13), described docking unit is attached to the different radial position of described actuating arm (10), and in described linking arm (20), has and be configured to and each described unit (12 that docks, 13) the cam face parts (23a coordinated, 23b, 24a, 24b).

5. preselector actuating device according to claim 4, is characterized in that, each docking unit (12,13) is roller.

6. according to the described preselector actuating device of claim 4 or 5, it is characterized in that, described cam face parts (23a, 23b, 24a, 24b) be configured to the docking unit (12) of described radially inner side, contact during the described initial stage, and contact with the docking unit (13) of described radial outside at described interim period with during described latter stage.

7. according to the described preselector actuating device of claim 4 or 5, it is characterized in that, described cam face parts (23a, 23b, 24a, 24b) comprise and be configured to the second cam portion parts (24a, 24b) that dock the first cam portion parts (23a, 23b) of unit matching and be configured to dock with described second unit matching with described first.

8. preselector actuating device according to claim 7, it is characterized in that, described the first cam portion parts (23a, 23b) are positioned at pivotal axis (21) from described pitman arm (20) than the larger radial distance of described the second cam portion parts (24a, 24b).

9. preselector actuating device according to claim 7, it is characterized in that, described the first cam portion parts (23a, 23b) comprise that at least one has the cam section of concave arc shape, and radially extending of described the second cam portion parts (24a, 24b) is the twice of radially extending of described at least one cam section at least.

10. preselector actuating device according to claim 1, is characterized in that, described driving input block (11) be configured to can on any one direction the rotation with on any one direction the rotation described preliminary election arm (51).

11. preselector actuating device according to claim 10, it is characterized in that, described the second cam portion parts (24a, 24b) has U-shaped, also be described cam face parts (23a, 23b, 24a, 24b) about line (L) symmetry, described line (L) and described U-shaped the second cam portion parts (24a, the bottom perpendicular to described U-shaped the second cam portion parts is intersected in centre 24b), also be described the first cam portion parts (23a, 23b) comprise and be positioned at described U-shaped the second cam portion parts (24a, two cam section of every side 24b), described cam section is except being of similar shape mirror image each other.

12. a shunting switch, is characterized in that, described shunting switch (100) comprises according to the described preselector actuating device of claim 1 to 11 any one.

13. a transformer is characterized in that described transformer comprises shunting switch according to claim 12.