WO2013000722A1

WO2013000722A1 - Electric switchgear

Info

Publication number: WO2013000722A1
Application number: PCT/EP2012/061290
Authority: WO
Inventors: Dirk Weissenberg
Original assignee: Siemens Aktiengesellschaft
Priority date: 2011-06-30
Filing date: 2012-06-14
Publication date: 2013-01-03
Also published as: DE102011078483A1

Abstract

The invention relates to an electric switchgear, comprising a first and a second switching contact piece (7, 8). The two switching contact pieces (7, 8) can be moved relative to one another. At least the first switching contact piece (7) is coupled to a drive gear (20, 24). In addition, an insulating material nozzle (15) is inserted, which encloses the switching contact pieces (7, 8). The insulating material nozzle (15) comprises an insulating material nozzle channel (16). A section (24) of the drive gear (20, 24) penetrates the insulating material nozzle channel (16).

Description

description

The invention relates to an electrical switching device having a first and a second switching contact piece, which are movable relative to each other and of which at least the first switching contact piece, is coupled to a drive gear and an insulating nozzle surrounds a switching path between the switching contact pieces.

Such electrical switching device is known for example from the patent DE 197 27 850 Cl. The local electrical switching device is designed in the form of a high-voltage circuit breaker with two oppositely driven switching contact pieces. Between the known

Switch contact pieces is arranged a switching path. Furthermore, an insulating nozzle surrounds the switching path. The insulating nozzle is used in the known electrical switching device to direct and direct hot switching gases or a switching arc. The insulating nozzle is subject to increased aging due to the thermal effects during switching operations. The insulating nozzle is further used to transmit movement to the first switching contact piece. The insulating nozzle is part of a Antriebge ^¬ drive and transmits driving forces. By integrating the known insulating material nozzle in the drive gear for the first movable switching contact piece, the insulating material nozzle is subjected to drive forces. Especially at high switching speeds, cracks may occur in aged insulating material nozzles.

Thermal and mechanical loads have a negative effect on the stability of the insulating material nozzle. In order to prevent switching ^¬ failure, the insulating material after a certain number of switching cycles to replace the most precaution. Thus, it is an object to provide an electrical switching device, which can ensure a ver ^¬ größerte number of switching cycles with reduced maintenance costs.

According to the invention the object is an electrical

Switching device of the type mentioned solved in that a portion of the drive gear of the first switching contact ^¬ piece passes through a Isolierstoffdüsenkanal the Isolierstoffdüse.

An insulating nozzle channel is a recess which passes through the insulating material and is bordered by the insulating material ^¬ . Through the Isolierstoffdüsenkanal it is possible to ^{hindurchzu ¬} lead through an assembly / a component of the drive ^gear , wherein the assembly can be arranged, for example, movable relative to the insulating material. So can be transmitted inde pendent ^¬ of the insulating nozzle, a driving force to the first switching contact piece. The insulating material nozzle is relieved of driving forces, and provides a ready insulating nozzle, which at least is a ^¬ receiving portions of the drive gear. For example, the channel can be penetrated by laterally movable drive rods, cables or other assemblies of a kinematic chain. Drive gear and Isolierstoffdüse should ^¬ th independently of each other, so that relative movements to each other are possible.

In particular, the Isolierstoffdüsenkanal the recording of a switching contact piece serve and this example, to ^¬ grip. The insulating material can limit a switching path in ra ^¬ dialer direction. The extent of a switching path located between switching contact pieces varies as a function of the switching state of the electrical switching device. When switched on, the switching path has its ^minimum extent. In the off state, the Schaltstre ^¬ bridge their maximum extent. The Isolierstoffdüsenkanal may be filled by parts of the drive gear. This is the space of a Isolierstoffdüse efficiently exploited and the Isolierstoffdüse can independently of mechanical forces their flow and steering function for switching arcs, switching gases, etc. exercise. Sections of the drive gear, which extend in the interior of the insulating nozzle channel, may preferably act electrically insulating. Thus, the dielectric strength of the insulating material remains even when receiving a portion of a drive gear erhal ^¬ th. The drive gear can be used in the region of Isolierstoffdü- senkanals for example, to reduce the cross ^{¬ section} of Isolierstoffdüsenkanals and so to change the flow resistance of Isolierstoffdüsenkanals. A flow of switching gases through the Isolierstoffdüsenkanal is influenced. It can be provided, for example, that in the course of a switching operation of the Isolierstoffdü ^¬ senkanal is almost completely dammed by one, in particular of the first switching contact piece, whereas after removal of the switching contact piece from the mouth of Iso ^¬ lierstoffdüsenkanals the Isolierstoffdüsenkanal is released. The drive gear can enforce the Isolierstoffdüsenkanal the Isolierstoffdüse even after a lifting of a damming by a switching contact piece. For example, in a drive rod which is part of is Antriebsge ^¬ drive may be provided to provide the drive shaft with different cross sections, so that, depending on the relative position of the drive rod to the insulating material in the insulating nozzle, the flow-off of switching gases is variably affected by the insulating nozzle ,

A further advantageous embodiment may provide that a portion of the drive gear passes through the second switching contact ^¬ piece. In addition to enforcing the Isolierstoffdüsenkanals with a portion of the drive ^gear , a part of the Antriebsgetrie ^¬ bes can also enforce the second switching contact piece. For example, it may be provided that in the course of the drive gear the Isolierstoffdüse and the second switching contact ^¬ piece are axially arranged one behind the other. However, it can also be provided that there is a radial overlap of the insulating material nozzle and of the second switching contact piece, so that, for example, the insulating material nozzle not only surrounds the drive gear in sections, but the insulating material nozzle also surrounds the second switching contact ^piece . As a result, for example, an additional mechanical or thermal protection for the second switching contact piece can be ensured. Parts of the drive gear which pass through the second switching contact piece should preferably be movable relative to the second switching contact piece. Furthermore, it can be advantageously provided that the drive gear is connected to the second switching contact piece facing the end of the first switching contact piece with the first switching contact piece. Previous designs are worn to keep facing ends of the switch contact pieces free of attachments. In particular, drive gears were coupled to opposite ends of the switching contact pieces to ei ^¬ ne movement of the switching contact pieces relative to each other to-generating. In particular, when using a common drive means to move both the first and the second switching contact piece, wherein a coupling of the switching contact pieces to the drive means via one or more drive gear, it is often provided to arrange the drive means in the vicinity of one of the two switching contact pieces and by means of a drive gear to traverse the switching path between the switching contact pieces. With a tethering of the traversing drive gear at an end facing away from the switching path end, the spatial extent of the drive gear is increased. The transmission behavior of the drive gear can be adversely affected by vibration processes o. Ä. The previous solutions provided, the insulating nozzle as part form the drive gear. This led to detrimental ^¬ mechanical loads and premature aging of the insulating material. The real task of the insulating ^¬ material nozzle, namely a guiding, steering and guiding a

Schaltlichtbogens and hot switching gases, was increasingly superimposed by their mechanical properties as a transmission component. If now one uses the other switching contact ^¬ piece facing the end for connecting the drive gear with a switching contact piece, it can be done directly driving and steering of the switching contact piece. For example, it may be provided to store the switching contact piece and linearly displaceable to support the movable first switching contact piece in ^¬ play, in a bush-shaped guide to be axially displaceable. For a simple storage of the first switching contact piece is given, so that, for example, in a construction of an electrical switching device lying behind the first switching contact piece, so remote from the switching path area, can be kept free of a drive train. Thus, a comparison with conventional versions shortened electrical switching ^{device konstruier ¬} bar.

A further advantageous embodiment may provide that the second switching contact piece has a contact socket.

A contact socket provides a recess to form an outer contact carrier in a plug connection, in which an inner pin, which is complementary in shape, can be inserted. Accordingly, in an embodiment of the second switching contact piece in the form of a contact socket to form the first switching contact piece in a pin shape. The pin is to be retracted in the course of a switching movement in the contact socket or to remove it from the contact socket. A sufficient contact pressure between see first and second switching contact piece is ensured by elastically deformable sections. The contact book ^¬ se is suitable to be penetrated in its socket area of a part of the drive gear. It can For example, be provided that the second switching contact piece is radially surrounded by the insulating material, wherein the Isolierstoffdüsenkanal is advantageously arranged in alignment with the contact socket or socket opening of the second Schaltkontakt- piece. So it is for example possible to pass ei ^¬ NEN portion of the drive transmission both through the contact ^¬ socket of the second switching contact piece as well as by the insulating nozzle of insulating material and to cause movement of the first switching contact piece relative to the second switching contact piece.

A further advantageous embodiment can provide that both the first and the second switching contact piece are movable relative to a base via a common drive means, wherein via the drive gear to the first switching contact piece a movement in the opposite direction to a movement of the second switching contact piece is transmitted. A movement of the two switching contact pieces relative to each other should preferably also take place relative to a common base. The base is thus a supporting body, wel ^¬ cher allows supporting the switching contact pieces and de ^¬ ren position relative to one another determined. It can be provided, for example, that the first switching contact piece can be driven via a drive device, wherein a, for example, linear movement is impressed on the first switching contact piece. As part of the effect of a drive gear applied to the first switching contact piece movement can be reversed by the drive gear in their sense, so that, for example, both switching contact pieces are moved towards each other or both switching contact pieces are removed from each other. Preferably, the two contact pieces can move along a common direction (eg a longitudinal axis) with opposite sense of direction.

By moving both switching contact pieces relative to the base, the relative speed of the switching contact pieces be increased to each other in a simple manner. The movement of the two contact pieces complement each other.

For example, a support element of an interruption unit can serve as the basis. For example, serve as support elements, housing, current path sections of the electrical switching device, which are stationarily positioned, and so on.

A further advantageous embodiment may provide that the first and the second switching contact piece are arcing contact pieces, which each protect a zugerhöriges first and second rated current contact piece before electric arc erosion.

An embodiment of the switching contact pieces as Lichtbogenkon- clock pieces permitted due to the renunciation of a large slung small deflection mechanism at one end of the first Schaltkon ^¬ clock track, which is applied by the switching section, assigned to the first switching contact piece is a compact slung first rated current contact piece. The rated current contact pieces serve thereby a permanent guidance and steering of a primary current. The arcing contact pieces, however, are so po ^¬ sitioned that contacting the arcing contact pieces always takes time before contacting the rated current contact pieces. Conversely, in the case of a switch-off operation, first of all the nominal current ^{contact pieces are} disconnected and subsequently the arc ^{contact pieces are} disconnected. Thus, it is ensured that a Ausschaltlichtbogen burns after commutation of an electric current to the arcing contact pieces between the arcing contact pieces. In reverse order, when switching on the contacting of the arcing contact pieces and then contacting the rated current contact pieces, so that Vorüber ^¬ blows preferably occur at the arcing contact pieces. When using rated current contact pieces, for example, one of the rated current contact pieces as a basis nen ^¬ . Furthermore, it can be advantageously provided that the base is connected in a rigid angle with one of the rated current contact pieces. The base may, for example, be connected or a rated current contact piece itself forms the basis for the relatively movable switching contact pieces with one of Nennstromkon ^¬ clock pieces. As a basis, for example, a hous ^¬ se serve, which positions assemblies of the electrical switching device relative to each other.

In the following, an embodiment of the invention is sche ^¬ matically shown in a drawing and described in more detail below.

It shows the

Figure shows a section through an electrical switching device. In the figure, a section through an electrical Schaltge ^¬ advises shown. In the present case, a high-voltage circuit breaker in dead tank design is exemplified. The electrical switching device has an encapsulating housing 1. The encapsulating housing 1 has a metallic base body, which is itself formed fluid-tight and closed. Thus, it is possible that to fill the interior of the encapsulating housing 1 with a gas or a liquid, in particular with egg ^¬ nem gas or a liquid under pressure. Compressed gas insulations which have a sulfur hexafluoride component have proved to be advantageous. Thus, the interior of the encapsulating housing 1 is preferably filled with an insulating gas-driven ^¬ Electr. The encapsulating housing 1 has a first connection 2 and a second connection 3. The sockets 2, 3 are provided with flanges, so that in each case one bushing can be placed on the sockets 2, 3, so that a connection line can be electrically insulated and introduced into the interior of the encapsulation housing 1 in a fluid-tight manner. In the present case, a first outdoor bushing 4 and a second outdoor bushing 5 is placed on the first port 2 and on the second port 3. The outdoor bushings 4, 5 have a first and a second phase conductor 6a, 6b. The phase conductors 6a, 6b protrude at the free ends of the first and the second outdoor bushing 4, 5 into the atmosphere and can be contacted there with corresponding connection lines. The phase conductors 6a, 6b protrude electrically insulated from the encapsulating housing 1 into the interior of the encapsulation housing 1 filled with an insulating medium.

In the interior of the encapsulating housing 1 a breaker device ^¬ integral of a circuit breaker is arranged. The breaker ^¬ unit of the circuit breaker has a first switching contact piece 7 and a second switching contact piece 8. The two switching contact pieces 7, 8 extend along a longitudinal axis 9 and are mounted ver ^¬ displaceable along this longitudinal axis 9. The first switching contact piece 7 is formed pin-shaped. The second switching contact piece 8 is formed sleeve-shaped. The two switching contact pieces 7, 8 are used in the present case as arcing contact pieces. Zvi ^¬ rule the two switching contact pieces 7, 8 is a switching path is arranged. The first switching contact piece 7 is a first Nennstromkon- contact piece 10 assigned. The first rated current contact piece 10 is stationarily supported via an insulating body 11 on the encapsulating housing 1. The second switching contact piece 8 is associated with a second rated current contact piece 12. The second rated current contact piece 12 is guided in a sliding guide 13 along the longitudinal axis 9 slidably. The sliding guide 13 is electrically isolated via an insulating body on the encapsulating housing 1 supported. The first phase conductor 6a is contacted with the second rated current contact pieces 12, the second phase conductor 6b is electrically conductively connected to the first rated current contact piece 10. The first rated current contact piece 10 is di rectly ^¬ contacted with the second phase conductor 6b. The second rated current contact piece 12 is via a sliding contact arrangement contacted with the sliding guide 13, to which the first phase conductor 6a is connected.

The first rated current contact piece 10 has a hollow cylindrical shape and is arranged coaxially to the longitudinal axis 9. The pin-shaped first switching contact piece 7 has a substantially circular-cylindrical shape and is likewise arranged coaxially to the longitudinal axis 9. The first rated current contact piece 10 surrounds the first switching contact piece 7 on the outer jacket side. The first

Switching contact piece 7 is displaceably mounted along the longitudinal axis 9 in a guide 14, which extends on the inner side of the first rated current contact piece 10, and is electrically conductively connected to the first rated current contact piece 14 via the guide 14. The second switching contact piece 8 is angularly fixed to the second rated current contact piece 12. The second rated current contact piece 12 engages around the second

Switch contact piece 8 outer shell side. The second rated current ^¬ contact piece 12 is configured substantially hollow cylindrical. In an analogous manner, the second Schaltkontakt- piece 8 is also designed with its sleeve shape hollow cylindrical. The second rated current contact piece 12 and the second switching contact piece 8 are connected in an electrically conductive manner with an angle angle. Winkelstarr is a Isolierstoffdüse 15 with the second

Rated current contact piece 12 connected. The insulating material nozzle 15 is, for example, a sintered polytetrafluoroethylene nozzle which has an insulating nozzle channel 16. The insulating material ^¬ nozzle channel 16 extends coaxially project beyond the mutually facing wall ^¬ th ends of the first switching contact piece 7 and the second switching contact piece 8 into the insulating nozzle to the longitudinal axis 9. In the sixteenth Between the two switching contact pieces 7, 8 a switching path is arranged. The

The switching path is bounded / surrounded radially by the insulating material nozzle 15. Thus, a radial breakout of a

Arc from the switching path through the Isolierstoffdüse 15 prevented. A switching arc burns within the Iso ^¬ lierstoffdüsenkanals sixteenth To generate a movement of the second rated current contact piece 12 along the longitudinal axis 9, a crank rocker 17 is connected via a connecting rod 18 to the second rated current contact piece 12. A rotation of the rocker arm 17 is converted via the connecting rod 18 into a linear movement in the direction of the longitudinal axis 9. By means of the rocker arm 17 and the connecting rod 18, a movement of the second rated current contact piece 12 in the direction of the longitudinal axis 9 can be generated. The rocker arm 17 mounted on a drive shaft 19 which fluid-tightly passes through the Cape ^¬ selungsgehäuse. 1 Outside of the encapsulating housing 1 arranged in a, not shown in the figure drive means which can cause a rotational movement of the drive shaft 9.

A two-armed lever 20 is fixedly mounted on the encapsulating housing 1. The fixed bearing 21 acts against the Kap ^¬ selungsgehäuse 1 electrically insulating. The two lever arms of the two-armed lever 20 each have forked ends, so that in each case a sliding passage is formed. In a first end 21a, a driving pin 22 is guided in a first sliding passage, which is fixedly secured to the second rated current contact piece 12. Thus, in a la ^¬ teral movement of the second rated current contact piece 12 of the driving pin 22 through the first sliding gate of the first

End 21 a of the two-armed lever 20 moved therethrough. The two ^¬ armed lever 20 undergoes a pivotal movement about the stationary ^¬ fixed support 21. Due to the oppositely directed carrying of the first end 21a with respect to a second end 21b of the two-armed lever 20, a pivoting movement is performed on the second end 21b of the two-armed lever 20. The second end 21b of the two-armed lever 20 has a second cam gear, which is scanned by a further driving pin 23. The further driving pin 23 is attached to a drive rod 24 in the radial direction. The on ^¬ operating rod 24 is coupled to the first switching contact piece 7 at the second switching contact piece 8 facing the end of the first switching contact piece 7. The drive rod 24 is For example, an electrically insulating rod, z. Example of a fiberglass material, an aramid or other suitable material, which has a thermal resisting effects of an arc sufficient resistance. Due to the mutually bracing ends 21a, 21b of the two-armed lever 20 takes place during a rotational movement of the first end 21a entrainment of further Mitnahmebol ^¬ zen 23 along the longitudinal axis 9 with opposite sense of direction for movement of the second switching contact piece 8. While the first rated current contact piece 12 in the direction the longitudinal axis 9 moves with a first sense of direction, the drive rod 24 also moves in the direction of the longitudinal axis 9, but with opposite sense of direction. The drive rod 24 is arranged coaxially with the longitudinal axis 9. The drive rod 24 extends through a Buchsenöff ^¬ voltage of the second switching contact piece 8 as well as by the Iso ^¬ lierstoffdüsenkanal 16 of the insulating material 15 therethrough. The drive rod 24 is connected to the end of the first switching contact ^¬ piece 7, which projects toward the second switching contact piece 8. Thus, a movement of the drive rod 24 can be proportionally transmitted to the first switching contact piece 7. During a switch-on process, the second rated current contact piece 12 is displaced in the direction of the first rated current contact piece 10. The second switching contact piece 8 is moved together with the second rated current contact piece 12. The first rated current contact piece 10 remains at rest. A BEWE ^¬ supply of the second rated current contact piece 12 and the second switching contact piece 8 is opposed on the two-armed lever 20 of the drive gear and the drive rod 24 of the drive gear directed to the first clock Schaltkon ^¬ piece 7 transmitted. Thus, the two switching contact pieces 7, 8 approach at a power-up with an increased speed compared to the speed of approach of the two rated current contact pieces 10, 12. This ensures that at a power-up first the switching contact pieces 7, 8 contact each other and subsequently the rated current contact pieces 10, 12 each PLEASE CONTACT ^¬ ren. During a disconnection, a reversal of movement occurs conditions of the second rated current contact piece 12, respectively, of the second switching contact piece 8 and the first Schaltkon ^¬ clock-piece 7. In this case, it is ensured that initially the rated current contact pieces 10, 12 separate from each other and, following the switching contact pieces 7, 8 separate time out of each other.

Thus, a current which is fed in via the phase conductors 6a, 6b into the interrupter unit of the electrical switching device can be commutated to the switching contact pieces 7, 8 during a turn-off operation of the rated current contact pieces 10, and a turn-off arc is preferably conducted between the two switching contact pieces 7, 8. The first switching contact ^¬ piece 7 is electrically conductively connected via the guide 14 with the first rated current contact piece 10, so that commutation of a breaking current is possible.

In addition to the embodiment variant of an electrical switching device in the form of a high-voltage circuit breaker with a grounded encapsulating 1 shown in the figure, also a use of a switching device according to the invention in live tank design for Freiluftschaltanla ^¬ gen or as a switching device in gas-insulated switchgear.

Claims

claims

1. Electrical switching device having a first and a two ^¬ th switching contact piece (7, 8) which are movable relative to each other and of which at least the first switching contact piece (7) to a drive gear (17, 18, 19, 20, 24 ) is coupled and an insulating material nozzle (15) a switching path between ^¬ rule the switching contact pieces (7, 8) surrounds,

d a d u r c h e c e n c i n e s that

a section of the drive gear (17, 18, 19, 20, 24) of the first switching contact piece (7) passes through an insulating material nozzle channel (16) of the insulating material nozzle (15).

2. Electrical switching device according to claim 1,

d a d u r c h e c e n c i n e s that

a portion of the drive gear (17, 18, 19, 20, 24) passes through the second switching contact piece (8).

3. Electrical switching device according to one of claims 1 or 2,

d a d u r c h e c e n c i n e s that

the drive gear (17, 18, 19, 20, 24) on one of the two ^¬ th switching contact piece (8) facing the end of the first

Switching contact piece (7) with the first switching contact piece (7) is connected.

4. Electrical switching device according to one of claims 1 to 3, d a d e r c h e c e n e s in that e

the second switching contact piece (8) has a contact socket.

5. Electrical switching device according to one of claims 1 to 4, d a d e r c h e c e n e s in that e

both the first and the second switching contact piece (7, 8) relative to a base (1) via a common On ^¬ drive device (17, 18, 19, 20, 24) are movable, wherein (via the drive gear 17, 18, 19 , 20, 24) on the first switching contact piece (7) a movement in opposite Direction is transmitted to a movement of the second switching contact piece (8).

6. Electrical switching device according to one of claims 1 to 5, d a d e r c h e c e n e c i n e that t

the first and the second switching contact piece (7, 8) are Lichtbo ^¬ genkontaktstücke which protect each zugerhöriges first and second rated current contact piece (10, 12) against Lichtbogenero ^¬ sion.

7. Electrical switching device according to claim 6,

d a d u r c h e c e n c i n e s that

the base (1) is rigidly connected to one of the rated current contact pieces (10, 12).