CN101990693A

CN101990693A - On-load tap-changer

Info

Publication number: CN101990693A
Application number: CN2009801123453A
Authority: CN
Inventors: 克里斯托弗·马克·尼科尔
Original assignee: Brush Transformers Ltd
Current assignee: Brush Transformers Ltd
Priority date: 2008-02-01
Filing date: 2009-02-02
Publication date: 2011-03-23
Also published as: GB0801927D0; WO2009095686A1; GB2457079A; AU2009208790A1; JP2011512028A; ZA201006103B

Abstract

An on-load tap-changer switching mechanism (200) comprising: an annular cam (210) defining a plurality of raised portions (311); and a switch assembly (220) disposed at least partly within and rotatable relative to the annular cam, the switch assembly including an electrical switch (224a) and a cam follower (222a) engaged with the inner surface of the annular cam, wherein the plurality of raised portions are configured to actuate the cam follower on relative rotation of the annular cam and switch assembly, actuation of the cam follower causing operation of the electrical switch.

Description

The tap changer of carrying is arranged

Technical field

The present invention relates to be used for tap changer (on-load tap-changer) mechanism of carrying that has of power transformer, and be specifically related to carry the apparatus and method that are used for the control operation sequential in the tap-change.

Background technology

What of power that the change in electrical charge effect for example depends on that the transformer downstream is drawn the high-tension transformer that is used for transformer station be subjected to.Have and carry tap changer permission different transformer turn ratio of selection under the situation that needn't interrupt load current.This makes that the power transformer that has year tap changer should not interrupt for load current is useful.

A plurality of tap positions are set on Transformer Winding make it possible to the number of turn of transformer is selected, thereby make the transformer of production have effective variable turn ratio.This makes the voltage adjustment of transformer secondary output (output) side can adapt to different loads.

Fig. 1 schematically shows the typical circuit design of carrying tap changer.Have the tap changer 100 of carrying to comprise the transformer coil 160 that is connected to first binding post 180, this transformer coil 160 has a plurality of tap position switches 110,112, to select different turn ratios on coil 180.The change over switch 130 that comprises rotary switch arm 170 and transimpedence 140,142 is connected to second binding post 190 with tap position switch 110,112, thereby forms circuit.

Tap position switch 110 is shown as closed, thereby the tap position that links to each other is connected to terminal 190 via rotary switch arm 170, shown in rotary switch arm 170 make transimpedence 140 short circuits.

Tap changer follow a series of step with tap position that switch 110,112 is associated between realize that the tap-change of carrying is arranged, be summarized as follows:

● tapping switch 112 closures;

● the rotary switch arm 170 of change over switch 130 is rotated counterclockwise a position, and in this position, electric current only flows through transimpedence 140 and arrives terminal 190;

● rotary switch arm 170 further forwards a position to, and in this position, load is passed through

transimpedence

140 and 142 simultaneously;

● rotary switch arm 170 further forwards a position to, and in this position, load only arrives terminal 190 through transimpedence 142;

● the rotary switch arm 170 of change over switch 130 further forwards a position to, in this position, and transimpedence 142 short circuits, and provide load by tap position 112; And

● tapping switch 110 is opened.

Below only describe a kind of in the multiple possible order of tap-change, but showed the General Principle that is comprised.US 4,081, disclosed a kind of more detailed tap-change order in 741, and it is similar to the operating sequence that above provides.The document also shows the use to vacuum switch (being also referred to as vacuum circuit-breaker), and it is used in load when another tap is transferred in a tap, can make vacuum switch avoid the discharge of not expecting.

Since need a series ofly relate generally to step high pressure, complicated in tap changing operating period, thus there is the tap changer assembly of carrying to be tending towards huge, and mechanically be tending towards complicated.In high-tension transformer, tap changer tends to be installed in the interior oil-overflow chamber of transformer, need tap changer be mounted and dismounted along the vertical direction with respect to transformer.All these require all can to make the installation and removal of the tap changer difficulty that becomes, and have potential danger, if implement in the transformer station of running then all the more so.

Summary of the invention

The objective of the invention is to solve one or more the problems referred to above.

According to a first aspect of the invention, proposed a kind of tap changer switching mechanism of carrying that has, it comprises:

Ring cam set, described ring cam set limits a plurality of lug bosses; And

Switch module, described switch module are positioned at described ring cam set at least in part and can rotate with respect to described ring cam set, and described switch module comprises electric switch and cam follower, and described cam follower engages with the inner surface of described ring cam set,

Wherein, described a plurality of lug bosses are configured to and can activate described cam follower when rotating in that described switch module is relative with described ring cam set, and this actuating to described cam follower causes the operation of electric switch.

According to a second aspect of the invention, proposed a kind of operation the method for carrying the tap changer switching mechanism has been arranged, described have the tap changer switching mechanism of carrying to comprise ring cam set and switch module, described ring cam set limits a plurality of lug bosses, described switch module is in the described ring cam set at least in part and can rotates with respect to described ring cam set, described switch module comprises electric switch and the cam follower that engages with the inner surface of described ring cam set, this method comprises: in that described ring cam set is relative with switch module when rotating, by activating described cam follower with the engaging of one or more lug bosses of described a plurality of lug bosses, this actuating to described cam follower causes the operation of electric switch.

Description of drawings

Below with reference to the accompanying drawings, the preferred embodiments of the present invention as non-limiting example are described, wherein:

Fig. 1 shows the circuit diagram of the modular design of carrying tap changer;

Fig. 2 a is illustrated in the floor map of tap changer in first kind of configuration;

Fig. 2 b is illustrated in the floor map of the alternate embodiment of tap changer in first kind of configuration;

Fig. 3 a to 3c shows the detailed section view of the tap changer of Fig. 2 a;

Fig. 3 d and 3e show the detailed section view of the tap changer of Fig. 2 b;

Fig. 4 shows around the stereogram of a pair of sliding contact of ring cam set periphery;

Fig. 5 shows the schematic partial plan layout of the ring cam set in the installation frame with electric contact;

Fig. 6 shows the stereogram of the contact carrier with a pair of sliding contact;

Fig. 7 shows the part and the cutaway view that contacts pin that is loaded with spring of contact carrier;

Fig. 8 shows the schematic plan view of second kind of configuration of the tap changer of Fig. 2;

Fig. 9 shows the schematic plan view of the third configuration of the tap changer of Fig. 2;

Figure 10 shows the schematic plan view of the arrangement of another kind of tap changer;

Figure 11 shows the schematic cross sectional views of the sliding contact arrangement of the another kind of tap changer arrangement that is used for Fig. 8;

Figure 12 shows the schematic perspective view of the exemplary embodiment in a stage that is used for tap changer;

Figure 13 shows the electrical connection graph of tap changer;

Figure 14 a and 14b show the switching sequence of exemplary tap changer;

Figure 15 a shows the stereogram of exemplary tap changer assembly;

Figure 15 b shows the substituting stereogram of the part of selecting of the exemplary tap changer of Figure 15 a;

Figure 16 shows the stereogram of running contact arrangement; And

Cutaway view when the running contact arrangement that Figure 17 a to 17d shows Figure 16 is in different configuration.

Embodiment

As mentioned above, Fig. 1 is discussed in conjunction with background technology of the present invention.

Fig. 2 a shows the tap changer mechanism 200 according to an aspect of the invention, and wherein switch module 220 is arranged in the ring cam set 210.Switch module 220 comprises the first vacuum switch 224a and the second vacuum switch 224b, and each vacuum switch is connected to

corresponding cam follower

222a, 222b via connecting connecting rod 226a,

226b.Vacuum switch

224a, 224b provide the converter switch contact for the tap changer of carrying is arranged, and each

vacuum switch

224a, 224b are by

corresponding cam follower

222a, 222b and connect connecting

rod

226a, 226b actuating.

Fig. 2 b show tap changer mechanism 200 ' alternate embodiment, wherein Biao Zhu parts 210 ', 220 ', 222a ', 222b ', 224a ', 224b ', 226a ', 226b ' be corresponding to the parts of the similar numbering of mark among the embodiment of Fig. 2 a.Yet, the layout of connection connecting rod 226a ', 226b ' and the layout of 226a, 226b among Fig. 2 a are different, the difference part be to be used for bias unit cam follower, back-moving spring 228a ', 228b ' form be arranged to cam follower 222a ', 222b ' together, rather than as among Fig. 2 a and

vacuum switch

224a, 224b together.This biasing resetting device is illustrated in Fig. 3 d and 3e and in more detail in following description.

Fig. 3 a to 3c shows the more detailed cutaway view of vacuum switch 224a, connection connecting rod 226a, cam follower 222a and ring cam set 210 and other associated components of Fig. 2 a.

When ring cam set 210 during with switch module 220 relative rotations, cam follower 222 is followed the radially linear movement that the profile 310 of the inner surface of ring cam set 210 produces cam follower 222a, promptly along becoming vertical substantially direction to move with switch module 220 with respect to the axis of ring cam set 210 rotations.This radially linear movement be used for open and close vacuum switch 224a.Fig. 3 a to 3c shows the order that realizes this operation, wherein, and vacuum switch 224a closure in Fig. 3 a and 3b, and vacuum switch 224a opens in Fig. 3 c.In Fig. 3 a to 3c, only show a vacuum switch 224a among pair of switches 224a, the 224b.

With reference to figure 3a, for example can comprise that swiveling wheel follows the profile 310 of ring cam set 210 with the cam follower 222a that reduces friction during with respect to switch module 220 rotations at ring cam set 210.By means of first spring or unlatching spring 320 cam follower 222a is resisted against on the ring cam set 210 with being biased, this first spring or unlatching spring 320 are arranged in and connect between connecting rod 226a and the vacuum switch 224a.

Shown in Fig. 3 a, first spring 320 and second spring 330 all center on vacuum switch actuator coaxial arrangement, described vacuum switch actuator comprises plunger 340 and connecting rod 350, activates (that is, opening) vacuum switch 224a by plunger 340 is slided along arrow 370 indicated directions.The stop nut 360 that is positioned on the connecting rod 350 is provided with end stop for connecting connecting rod 226a, and described connection connecting rod 226a can resist and open the biasing that spring 320 provides and slide along connecting rod.

The profile 310 of ring cam set 210 comprises a plurality of lug bosses 311, and along circumferentially spaced apart, each lug boss 311 is all corresponding to the common diameter 315 of essence around ring cam set 210 for these lug bosses 311.As cam follower 222a during against one of them lug boss 311 location, vacuum switch 224a closure.

With reference to figure 3b, ring cam set 210 is shown as with respect to switch module 220 and rotates along clockwise (shown in the arrow 380), thereby causes that cam follower 222a follows profile 310 and connection connecting rod 226a is risen from vacuum switch 224a.In substituting arrangement, can obtain identical effect with respect to fixing ring cam set 210 along opposite spin by making switch module 220.In this transition state, connect the end stop that connecting rod 226a contact is provided by stop nut 360, and owing to 330 applied pressures of contact compression spring still remain closed vacuum switch.Connect the distance D 1 between connecting rod 226a and the vacuum switch 224a, and connect the distance D 2 between connecting rod 226a and the plunger 340, distance D 1, D2 than shown in Fig. 3 a have increased identical amount.

Below with reference to Fig. 3 c, ring cam set shown in it 210 further rotates along clockwise (shown in the arrow 380) with respect to switch module 220, cause that cam follower 222a follows profile 310 and connection connecting rod 226a is further risen by vacuum switch 224a, thereby make cam follower 222a place two grooves 312 between the adjacent lug boss 311.In this transition state, cam follower 222a is farthest away from vacuum switch 224a.Owing to rising, plunger 340 leaves vacuum switch 224a, so it is identical with Fig. 3 b with distance D 2 maintenances between the plunger 340 that the distance D 1 between connection connecting rod 226a and the vacuum switch 224a, connects connecting rod 226a simultaneously than further increasing to some extent shown in Fig. 3 a.Therefore this moment, vacuum switch 224a opened.

Fig. 3 d and 3e are depicted as the view of the alternate embodiment of Fig. 2 b, and described alternate embodiment is corresponding with the cutaway view of arrangement shown in Fig. 3 a and the 3c, i.e. vacuum switch closure (Fig. 3 d) and open (Fig. 3 e).The parts of similar mark have with the corresponding function of parts shown in Fig. 3 a to 3c.First spring 320 ' make cam follower 222a ' biasing be resisted against ring cam set 210 ' interior week, second spring 330 ' act as, when cam follower 222a ' immigration cam 210 ' on 312 ' time of groove, open vacuum switch 224a ' by activating connecting rod 226a '.Therefore, switch module 220 ' class of operation be similar to the embodiment of Fig. 2 a and Fig. 3 a to 3c, but spring 320 ', 330 ' operation on the sliding spool 351 of actuating cam driven member 222a ', rather than the plunger 350 that links vacuum switch 224a ' ' on operation.This arrangement simplify the structure and reduced switch module 220 ' overall dimension.Owing to the linear movement of biasing mechanism direct correlation cam follower 222a ' make vacuum switch plunger 350 between period of energization ' on the torque that produces minimum or eliminate, so this arrangement also makes the stability of actuating mechanism increase to some extent, thereby reduced the possibility that mechanism is blocked in the use.

Below with reference to Fig. 4,

conduction sliding contact

410a, 410b are arranged on the outside sweep surface 420 of rotary annular cam 210, described rotary annular cam 210 preferred insulating material manufacturings by for example polymer.In the embodiment shown,

conduction sliding contact

410a, 410b also are crooked.In order to install and rotation is bonded on (see figure 5) in the framework, ring cam set 210 can further include outer flat flanges portion 450.

Sliding

contact

410a, 410b shown in Figure 4 is the dislocation relation each other with respect to the direction of rotation 430 of ring cam set 210.

Sliding contact

410a, 410b are arranged on the ad-hoc location of ring cam set 210 outer surfaces 420 with respect to the lug boss 311 on ring cam set 210 inner surfaces 440.

Contact

410a, 410b and ring cam set profile 310 move with same rate mutually, thus in the tap-change operating period of being undertaken by ring cam set 210 rotations, the actuating sequential of switch module 220 will with the synchronized movement of

contact

410a, 410b.

With reference to figure 5, the ring cam set 210 that shows type shown in Figure 4 with plane graph is installed in the situation in the installation frame 510 rotatably, and described installation frame 510 comprises a plurality of electric contacts of terminal 520a, 520b

form.Sliding contact

410a, 410b force pin 530a, the 530b (not shown this spring among Fig. 5) that are loaded with spring to contact with corresponding binding post 520a, 520b respectively.In the time of near sliding

contact

410a, 410b move to next terminal 520b, each pin 530a, 530b disconnect contact.

Accurately locate sliding contact 410 by lug boss 311, can accurately determine the order of switch motion for specific tap-change operation with respect to ring cam set 210.

As shown in Figure 6, in an alternative embodiment, switch module 220 is with respect to 210 rotations of fixing ring cam set, and the contact carrier is loaded with the conduction sliding contact.Contact carrier 600 is mounted to switch module 220 and rotates around mounting points 605, and it comprises conduction sliding contact 610a, the 610b of the downside that is arranged in contact carrier 600, the 600 preferred insulating material manufacturings by for example polymer of described contact carrier.Conduction sliding contact 610a, 610b preferably are installed on the carrier 600 by spring, as Fig. 7 in more detail shown in.About Fig. 4 and rotary ring cam set 210 shown in Figure 5, slip electric contact 610a, 610b are the dislocation relation each other with respect to the direction of rotation 630 of contact carrier 600, thereby rotate with contact carrier 600 and carry out tap-change operating period at switch module 200, realize that switch is synchronous.

Fig. 7 illustrates in greater detail the cutaway view of contact carrier 600.One of them slip electric contact 610a is shown as by spring and is installed to contact carrier 600.Along with 600 rotations of contact carrier, contact 610a advances towards pin 710, and described pin 710 also can be installed by spring.In contact 610a and the pin 710 any one or both preferably have the leading edge of taper or rounding, thereby allow contact 610a transverse movement so that pin and binding post 720 electrically contact.

The mechanism that Fig. 8 and Fig. 9 illustrate Fig. 2 corresponding to ring cam set 210 with respect to the state under the different configurations in the different rotary orientation of switch module 220.When ring cam set 210 from orientation shown in Figure 2, when being all closed orientation rotation of

vacuum switch

224a, 224b, configuration is transformed to the situation of Fig. 8, wherein, when the first cam follower 222a follows cam contour when advancing to two grooves 312 between the adjacent protrusion portion 311, the first vacuum switch 224a opens, and the second vacuum switch 224b still remains closed.Along with ring cam set 210 is further rotated, the position of two vacuum switches exchanges, as shown in Figure 9, i.e. and the first vacuum switch 224a closure, and the second vacuum switch 224b opens.As mentioned above,, will repeat this switching sequence along with ring cam set 210 continues rotation, and with by the sequence synchronization that electrically contacts around the slip electric contact of the ring cam set 210 outer surfaces downside of contact carrier 600 (or).

The arrangement of switch module with respect to the ring cam set rotation has been shown among Figure 10.Switch module 820 is around mounting points 850 rotations, and ring cam set 810 and installation frame 830 then are maintained fixed.Because ring cam set 810 can be with respect to installation frame 830 rotation, so cam contour 310 can form on the inner surface of installation frame 830 itself.Electric contact 720 (Fig. 7) is shown as on the plane that is positioned at installation frame 830.Shown in more detail Fig. 7, the sliding contact on the carrier (not shown) of contact is with switch module 820 rotation, and along the planar slide of installation frame 830.This is shown specifically in Figure 11 further, wherein, the sliding contact 910 on the running contact carrier 600 be shown as along on arrow 920 indicated directions near contact pin 840.Sliding contact 910 can be arranged on the running contact carrier 600, so that required tapping switch ability to be provided, thereby use vacuum switch when needed, and make its with because of the switch on and off synchronised of sliding contact 910 with respect to electrically contacting of causing of the pin in the fixed installation frame 830 840 motion.

Comprise according to the exemplary embodiment of the tap changer mechanism of an aspect of the invention each stage is used two vacuum switches (being also referred to as Dewar bottle), a complete tap changer amounts to and all comprises six Dewar bottles.Figure 12 shows the schematic perspective view of exemplary embodiment in a stage of this tap changer.Travelling gear 1010 is attached to the switch module 1020 that comprises two vacuum switches via connecting axle 1015, and described switch module 1020 is installed on the ring cam set 1030, and described ring cam set 1030 itself is installed in the dividing plate 1040.The switch module 1020 that the rotation of travelling gear 1010 causes comprising arrangement shown in Figure 8 is with respect to ring cam set 1030 rotations, and sequential activation switching manipulation as requested is to implement the operation of tap-change.

Figure 13 shows the basic circuit diagram that required electrical connection describes to tap changer according to the present invention.Transformer coil 1320 comprises public terminal 1319 and arranges to allow a plurality of electric tap 1302-1318 of different output loads.Switch module 220 for example can make along with the rotation of assembly 220 along the rotation of arrow 1310 indicated directions, forms continuous electrical connection, thereby terminal 1301 is connected to selected electric tap terminal 1302-1318.

Figure 14 a and 14b show the typical sequence that the switching manipulation of carrying tap changer is arranged according to an aspect of the invention.Along with switch module 220 rotates to position B according to arrow 1410 indicated directions from position A, can produce a series of switching manipulation, shown in the figure of Figure 14 b.At position A, vacuum switch V _MAnd V _RClosure, terminal switch M closure, and bypass resistance switch R ₁Open.When switch module moves away position A, bypass resistance switch R ₁Closure, then vacuum switch V _MOpen and terminal switch M opens.Along with switch module 220 is further rotated, terminal switch M closure, then vacuum switch V _MClosed.Vacuum switch V then _ROpen, then bypass resistance switch R ₁Open, and vacuum switch V _RClosed once more to finish switching manipulation.As mentioned above, synchronous according to the relative position of the lug boss of sliding contact, pin and ring cam set to the operation of each switch.

Figure 15 a shows the stereogram according to the alternative exemplary embodiment of tap changer assembly 150 of the present invention, ring cam set 210 ' be fixed to installation frame or mainboard 153 wherein, switch module 220 ' be rotatably installed on the mainboard 153, ring cam set 210 ' in.Switch module 220 ' around central shaft 151 rotation, described central shaft 151 is preferred promptly can be electrically connected to the terminal 1301 shown in Figure 13 also as the center electric contacts of tap changer assembly 150, limits switch module 220 ' around the axis of its rotation simultaneously.Switch module 220 ' comprise vacuum switch 224a ', 224b ', they are operated because of the actuating of cam follower 222a ', 222b ', and other contact arrangement (will be described with reference to figure 15b and 16 hereinafter), all these parts can both be together with respect to ring cam set 210 ' rotation.Along with switch module 220 ' with respect to ring cam set 210 ' rotation, the order of switching manipulation and electrically contacts around conversion between the adjacent contacts post 152 of ring cam set 210 ' periphery as mentioned above.Contact post 152 provides the electrical connection of each tap 1302-1318 on the transformer, and tap changer assembly 150 is connected with these taps 1302-1318.

Embodiment shown in Figure 15 a shows favorable characteristics of the present invention, because switch module 220 ' be located in the inner space by ring cam set 210 ' limits and also can in the plane of cam 210 ' qualification, rotate, so that whole assembly 150 and conventional tap changer are compared size is littler.Be resisted against to cam follower 222a ', 222b ' biasing cam 210 ' inner surface on arrangement make it possible to cam 210 ' the plane in, promptly with on the direction of rotation quadrature activate vacuum switch 224a ', 224b ', reduced the overall height of tap changer assembly 150 thus.This arrangement has also been simplified the Machine Design of whole tap changer assembly 150 greatly.

Figure 15 b shows another stereogram of the tap changer assembly 150 of Figure 15 a, and what wherein show is under the situation of having removed mainboard 153, ring cam set 210 ' and switch module 220 ' downside.In this view, can see above-mentioned contact arrangement 154.The contact arrangement 154 that illustrates separately in Figure 16 in addition comprises sliding contact 155a, the 155b of two spring biasings, the first contact 155a is main electric contact, promptly be used for loaded current between the normal operating period, and the second contact 155b is a resistor contact, is used for being connected to bypassed resistor in tap-change operating period.Two contact 155a, 155b because different current-carrying requires and the size difference, but work usually in a similar fashion, in use all can be resisted against one of them the contact post 152 around ring cam set 210 ' layout elastic biasing.Be similar to above-mentioned other embodiment, the mode that contact 155a, 155b arrange with dislocation is arranged on the switch module, thereby can be electrically connected according to suitable order, and makes its operation at tap-change operating period and vacuum switch synchronous.

Figure 17 shows the exemplary operation order, and wherein, contact arrangement scheme 154 makes and realizes connecting conversion from first tap position of the first contact post 152a to second tap position of the second contact post 152b.Initially, contact 155 (that is any one among main contacts 155a or the resistor contact 155b) is resisted against the first contact post 152a with being biased.After contact assembly 154 rotations, contact 155 is connected and is connected with the second contact post 152b with first contact post 152a disengaging.155 is under the situation of main contacts 155a in the contact, with during the first contact post disengages short intervals with between the second contact post 152b contacts, with respect to the resistor contact 155b of main contacts 155a dislocation via the second contact post 152b loaded current.

Other embodiment should be in the scope of the present invention of claims qualification.

Claims

1. one kind has the tap changer switching mechanism of carrying, and comprising:

Ring cam set, described ring cam set limits a plurality of lug bosses; And

Switch module, described switch module are positioned at described ring cam set at least in part and can rotate with respect to this ring cam set, and described switch module comprises electric switch and the cam follower that engages with the inner surface of described ring cam set,

Wherein, described a plurality of lug bosses are configured to and can activate described cam follower when rotating in that described ring cam set is relative with switch module, and the actuating of this described cam follower causes the operation of described electric switch.

2. mechanism as claimed in claim 1, wherein, described a plurality of lug bosses are located on the inner surface of described ring cam set.

3. mechanism as claimed in claim 1 or 2 also comprises installation frame, and described installation frame has a plurality of contact terminals, and described ring cam set and described switch module are installed in the described installation frame at least in part.

4. mechanism as claimed in claim 3, wherein, described ring cam set can be with respect to described installation frame rotation.

5. mechanism as claimed in claim 3, wherein, described switch module can be with respect to described installation frame rotation.

6. mechanism as claimed in claim 4, wherein, described switch module and described installation frame are relative to each other fixing, and described ring cam set comprises sliding contact, and described sliding contact is configured to sequentially engage with described a plurality of contact terminals when described ring cam set rotation.

7. mechanism as claimed in claim 6, wherein, described sliding contact is laid on the periphery of described ring cam set.

8. mechanism as claimed in claim 7, it comprises a plurality of described sliding contacts, the mode that these sliding contacts are arranged with dislocation around the periphery of described ring cam set is provided with.

9. mechanism as claimed in claim 5, wherein, described ring cam set and described installation frame are relative to each other fixing, described switch module comprises sliding contact, and described sliding contact is configured to sequentially engage with described a plurality of contact terminals when described switch module rotates with respect to described installation frame.

10. mechanism as claimed in claim 9, wherein, described sliding contact can be along the planar slide of described installation frame.

11. as claim 9 or 10 described mechanisms, it comprises that a plurality of modes of arranging with dislocation are arranged on the described sliding contact on the described switch module.

12. mechanism as claimed in claim 11, wherein, described a plurality of contact terminals center on the periphery setting of described ring cam set with the form of a plurality of electric contact posts.

13. mechanism as claimed in claim 1, wherein, described cam follower is configured to activate described electric switch by the actuating of edge and the described switch module direction vertical substantially with respect to the axis of described ring cam set rotation.

14. the described mechanism of arbitrary as described above claim, wherein, described electric switch comprises vacuum switch.

15. the described mechanism of arbitrary as described above claim, wherein, described switch module comprises a pair of described cam follower, and each cam follower all is configured to cause the operation of the electric switch of a correspondence in a pair of described electric switch.

16. mechanism as claimed in claim 14, wherein, described pair of cams driven member is configured to cause the operation in tandem of described a pair of electric switch when rotating in that described ring cam set is relative with described switch module.

17. mechanism as claimed in claim 2, wherein, described cam follower is resisted against on the inner surface of described ring cam set with being biased.

18. mechanism as claimed in claim 17, wherein, described switch module comprises the spring on the inner surface that is resisted against described ring cam set with being configured to make described cam follower biasing.

19. one kind has and carries a tap changer, comprises as described above in the claim that each describedly has a tap changer switching mechanism of carrying.

20. a piezoelectric transformer comprises the tap changer of carrying that has as claimed in claim 19.

21. an operation has the method for carrying the tap changer switching mechanism, described have year tap changer switching mechanism to comprise: limiting the ring cam set of a plurality of lug bosses and be arranged at least in part also can be with respect to the switch module of described ring cam set rotation in the described ring cam set, described switch module comprises electric switch and the cam follower that engages with the inner surface of described ring cam set, described method comprises: in that described ring cam set is relative with switch module when rotating, by with described a plurality of lug bosses in one or more engaging activate described cam follower, this actuating to described cam follower causes the operation of described electric switch.

22. one kind has the tap changer switching mechanism of carrying, described have the tap changer switching mechanism of carrying roughly as described herein, with reference to the accompanying drawings 2a to 17.