EP2063442A1 - Power switch with flexible conductors - Google Patents

Abstract

The breaker (10) has a switching contact (12) connected with a contact holder (26) in an electrically conducting manner by a connecting element (58) i.e. conductor strip. A mating contact (18) is connected with another contact holder (22) in an electrically conducting manner by another connecting element (58'). The contacts establish an electrically conductive separable connection for closing the breaker. The connecting elements are formed in a flexible manner and fixedly arranged at respective contact holders and respective contacts.

Description

TECHNICAL AREA

The invention relates to the field of circuit breakers according to the features of the preamble of claim 1. In particular, the invention relates to the field of compressed gas switches, which are used for switching high voltages.

Such a circuit breaker is generally used in metal-clad switchgear for voltage ranges above 52kV and for short-circuit currents above 10kA, and is provided with an arc-quenching type insulating gas, such as sulfur hexafluoride (SF ₆ ) and / or nitrogen and / or carbon dioxide, in the Generally filled up to a few bar pressure.

STATE OF THE ART

Out DE 44 27 163 A1 a line switch of the type mentioned is known.

This known circuit breaker includes a movable contact piece and a likewise movable counter-switching piece, which is intended to act together to close the circuit breaker with the contact piece. The contact piece - consisting of a movable rated current contact and a movable Abbrandkontakt - and the Gegenschaltstück - consisting of a movable Gegennennstromkontakt and a movable Gegenabbrandkontakt - are guided in a filled with an insulating gas chamber along a longitudinal axis in opposite directions. The contact piece is with a this Associated switching piece, fixed first contact carrier electrically connected. The counterpart switch piece is electrically connected to a fixed counter second contact carrier associated with the counter contact piece.

The switching piece is driven by a drive via a first gear and the counter-switching piece is driven by the switching piece via a second gear.

The electrical connection between the switching piece or the counter-switching piece and the respective contact carrier is made in each case via a sliding contact. DE 44 27 163 A1 discloses as a sliding contact between relatively movable parts of the contact piece and the counterpart switching spring spring. Instead of spring fingers further sliding contacts such as sliding tulips, coil spring contacts and contact lamellae are known in the art.

So that a sliding contact between two relatively movable conductors ensures reliable contact, the sliding contact must act with a certain contact pressure on the moving relative to the sliding contact conductor. The contact pressure must be selected so that it creates a sufficient contact surface between the sliding contact and the conductor. The contact pressure in particular depends on the resistance, the voltage drop and the heating between the sliding contact and the conductor. Especially with continuous current load, the resistance, the voltage drop and the heating between sliding contact and conductor must be kept within acceptable limits. Likewise, by means of the contact pressure between the sliding contact and the conductor acting lifting electrical forces must be compensated.

With a movement of the sliding contact relative to the conductor causes the contact pressure friction. This friction must be overcome by the drive of the circuit breaker and thus requires energy, which is to be applied by the drive. Next, the drive has to move momentum to move apply the moving parts of the circuit breaker. If the circuit breaker is a compressed gas switch, that is, if it has a cylinder-piston arrangement for compressing the insulating gas, the drive must apply energy for compressing the quenching gas. The extinguishing gas compressed by the cylinder-piston assembly is used to blow an arc burning between the burnup contact and the counter burnout contact.

PRESENTATION OF THE INVENTION

The object of the invention is to provide a circuit breaker which can be reliably operated with a reduced drive power.

This object is achieved by a circuit breaker having the features of claim 1.

Due to the inventive flexible design of the connecting elements, which are arranged between the movable contact piece and the first contact carrier and between the movable counter-contact piece and the second contact carrier, and the both sides each fixed arrangement of the flexible connecting element on the one hand to the movable contact piece or to the movable counter-contact piece and on the other to the first contact carrier or to the second contact carrier, a circuit breaker is provided which can be operated without friction losses due to sliding contacts. As a result, the maximum drive power, which is necessary for the reliable operation of the circuit breaker, can be reduced in comparison to the prior art.

Further, because of the reduced in comparison with the prior art drive power, the drive and the associated gear, the moving parts of the circuit breaker and thus the circuit breaker together the drive for actuating the circuit breaker in comparison to the prior art be made smaller.
Further embodiments, advantages and applications of the invention will become apparent from the dependent claims, from the claim combinations and from the following description and the figures.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1

einen erfindungsgemässen, als Druckgasschalter ausgebildeten Leistungsschalter in seiner geschlossenen Position mit einer Anordnung flexibler Verbindungselemente zwischen relativ zueinander beweglichen Teilen;

Fig. 2

den Leistungsschalter gemäss Fig. 1 in seiner offenen Position;

Fig. 3

einen weiteren erfindungemässen Leistungsschalter in seiner geschlossenen Position mit weiteren möglichen Anordnungen flexibler Verbindungselementen; und

Fig. 4

den erfindungsgemässen Leistungsschalter gemäss Fig. 3 in seiner offenen Position.

It is purely schematic

Fig. 1

an inventive, designed as a gas pressure switch circuit breaker in its closed position with an arrangement of flexible connecting elements between relatively movable parts;

Fig. 2

the circuit breaker according to Fig. 1 in its open position;

Fig. 3

another erfindungemässen circuit breaker in its closed position with other possible arrangements of flexible connecting elements; and

Fig. 4

the inventive circuit breaker according Fig. 3 in his open position.

In the figures, like parts are given the same reference numerals.

WAYS FOR CARRYING OUT THE INVENTION

In Fig. 1 and 2 an inventive circuit breaker 10 is shown, which is designed as a gas blast switch.

The circuit breaker 10 has a movable along a longitudinal axis A switching piece 12. This movable contact piece 12 is by a along the Longitudinal axis A movable rated current contact 14 and formed by a movable along the longitudinal axis A Abbrandkontakt 16, wherein the rated current contact 14 is rigidly coupled via a separating element 46 to the Abbrandkontakt 16. Furthermore, the circuit breaker 10 has a movable counterpart contact piece 18, which is formed by a movable counter consumable contact 20 cooperating with the movable burned contact 16 when the circuit breaker 10 is closed. The movable counterpart piece 18 is assigned a second contact carrier 22. This second contact carrier 22 also forms a cooperating with the movable rated current contact 14 Gegennennstromkontakt 24th

The movable Gegenabbrandkontakt 20 is guided by means not shown in the figures in a known manner.

The movable contact piece 12 - the rated current contact 14 and the Abbrandkontakt 16 - are supported by a this contact piece 12 associated first contact carrier 26 which is contacted via an electrical connection, not shown, and made of an electrically conductive material. This first contact carrier 26 has centrally in the direction of the longitudinal axis A a cylindrical portion 28. At one end of this cylinder portion 28, which faces away from the counter-switching piece 18 in the direction of the longitudinal axis A, an end plate 30 is arranged. At the other end of the first contact carrier 26, which faces the counter-contact piece, this has a circular disk 32. Between the cylinder portion 28 and the annular disc 32, the first contact carrier 26 has a radially tapered portion.

On the first contact carrier 26 of the contact piece 12 of the rated current contact 14 is movably mounted in the direction of the longitudinal axis A. This rated current contact 14 is from an open position of the circuit breaker 10 (see Fig. 2 ) in a closed position of the circuit breaker displaceable (see Fig. 1 ), in which the rated current contact 14 the Gegennennstromkontakt 24 and the Abbrandkontakt 16 contacts the Gegenabbrandkontakt 20. The movable rated current contact 14 is shaped like a hollow cylinder, whereby the end region intended for the contact of the counter current contact 24 tapers. In this end region of the rated current contact 14, a known insulating nozzle 34 is used.

The Abbrandkontakt 16 is tubular, wherein the open circuit breaker 10 (see Fig. 2 ) the Gegenabbrandkontakt 20 facing end is formed as a contact tulip, the contact fingers 36 has. The burnup contact 16 extends along the longitudinal axis A through the first contact carrier 26 therethrough. The burnup contact 16 is movably supported on the contact carrier 26 through a hole in the end plate 30 and through the hole of the annular disk 32 in the direction of the longitudinal axis A. For this purpose, 16 slide rings are arranged between the contact carrier 26 and the Abbrandkontakt. The intended for cooperation with the Gegenabbrandkontakt 20 end portion of Abbrandkontaktes 16 is arranged with respect to the rated current contact 14 and with respect to the insulating nozzle 34 such that the Abbrandkontakt 16 is arranged in a known manner radially within the insulating material 34 or within the rated current contact 14.

Within the rated current contact 14, a gas pressure space is formed, which consists of a heating volume 38 and a piston volume 40. The heating volume 38 is connected to a heating zone 42 formed by the insulating nozzle 34 with an arc zone 44 (FIG. Fig. 2 ) of the circuit breaker 10 and in the direction of the longitudinal axis A, opposite the Isolierstoffdüse 34, completed by the intermediate element 46. This intermediate element 46 separates the heating volume 38 from Piston volume 40 from, this radially outward on the rated current contact 14 and radially inwardly held on the Abbrandkontakt 16 is fixed or arranged. Between the piston volume 40 and the heating volume 38, an overpressure valve 48 is arranged in the intermediate element 46 such that at excess pressure in the piston volume 40 quenching gas can flow from the piston volume 40 into the heating volume 38. The annular disk 32 forms, together with the movable nominal flow contact 14, a cylinder-piston arrangement for compressing the quenching gas, wherein the piston volume 40 forms the cylinder volume. By means disposed in the annular disk 32 flushing valve can close the circuit breaker 10 flow into the piston volume 40 when closing.

The Gegennennstromkontakt 24 is substantially tubular, wherein it has contact fingers 50 at its free end, by means of which the nominal current contact 14 is contacted when the circuit breaker 10 is closed.

Radially within the Gegennennstromkontakts 24 and the second contact carrier 22 of the second contact carrier 22 movable Gegenabbrandkontakt 20 is arranged, which is rod-shaped and extending along the longitudinal axis A. The Gegenabbrandkontakt 20 is designed to be movable along the longitudinal axis A, wherein in the closed state of the circuit breaker 10 (see Fig. 1 ) the Gegenabbrandkontakt 20 is engaged with the Abbrandkontakt 16 and with open circuit breaker 10 (see Fig. 2 ) the Abbrandkontakt 16 is separated from the Gegenabbrandkontakt 20.

When opening or closing the circuit breaker 10, the consumable contact 16 and the counter consumable contact 20 move along the longitudinal axis A in the opposite direction. The movement of the Gegenabbrandkontakts 20 is for this purpose to the movement of the Abbrandkontakts 16 coupled via a gear 52, as for example DE 44 27 163 A1 is known. This gear 52 has a drive rod 54 made of an insulating material, which is firmly connected to the Abbrandkontakt 16. The movement of the Abbrandkontaktes 16 is transmitted via this serrated drive rod 54 and a gear 56 to the Gegenabbrandkontakt 20, for which purpose the gear 56 is stationary with respect to the second contact carrier 22 is arranged.

The burn-off contact 16 and the rated current contact 14, which together form the movable contact piece 12, are electrically connected to the first contact carrier 26 via a flexible connecting element 58 assigned to this contact piece 12. For this purpose, arranged between the rated current contact 14 and the first contact carrier 26 connecting element 58 on the one hand stationary on the rated current contact 14 and on the other hand fixedly mounted on the first contact carrier 26. The burnup contact 16 is electrically connected via the separating element 46 to the rated current contact 14.

Between the counter-switching piece 18 - formed by the Gegenabbrandkontakt 20 - and the second contact carrier 22 - the Gegennennstromkontakt 24 - the electrical connection is also made via a counter-switching piece 18 associated, flexible connecting element 58 '. This is fixedly attached to the counter erosion contact 20 and to the second contact carrier 22, which is manufactured integrally with the counter current contact 24.

A stationary connection can be formed for example by welding, soldering, screwing, riveting, rolling or pressing. Likewise, the stationary connection can be made by another positive connection or material connection.

The flexible connecting elements 58, 58 'are preferably formed like a ribbon, that is, that the Width of the connecting elements 58, 58 'is greater than its thickness. This results in a great flexibility about axes in the direction of the width and a comparatively low flexibility about axes in the direction of the thickness. Next, the connecting elements 58, 58 'on their two-sided end regions solidified or rigid, plate-like Befestigungsendbereiche. The transition from the attachment end regions into the flexible portion between the two attachment end regions is preferably such that the flexibility in the transition region increases continuously. At the Befestigungsendbereiche each of the stationary connection is made.

The flexible connecting elements 58, 58 'preferably have the structure of a woven fabric, of a knitted fabric or of a nonwoven fabric, wherein an electrically conductive material is used as thread, yarn or for the nonwoven-type structure bevels. Furthermore, a combination of conductive material and non-conductive threads, yarns or fibers can be used, wherein by means of the non-conductive threads, yarns or fibers, the mechanical properties of the flexible connecting element 58, 58 'are influenced in an advantageous manner, so that at parallel occurring current paths occurring forces not to an uncontrolled movement of the flexible connecting elements 58, 58 'leads.

In a further preferred embodiment of the flexible connecting elements 58, 58 ', these are made of a metal sheet, in particular of a spring steel sheet.

As in Fig. 1-4 shown, the flexible connecting elements 58, 58 'may be arranged at different locations, wherein in each case at least one flexible connecting element 58 between the movable contact piece 12 and the first contact carrier 26, and between the movable counterpart piece 18, in particular between the Gegenabbrandkontakt 20 and the second contact carrier 22 is arranged.

As in Fig. 1 shown, the arranged between the contact carrier 26 of the contact piece 12 and the rated current contact 14 flexible connecting element 58 is arranged in a U-shape. At the end region, directly after the end of the rated current contact 14 remote from the insulating nozzle 34, one end region of the connecting element 58 is fixedly arranged. The connecting element 58 initially leads in the direction of the insulating material nozzle 34, parallel to the surface of the rated current contact 14 and then turns in a U-shaped arc, so that the other end region of the connecting element 58 is fixedly arranged on the first contact carrier 26. This other end region of the connecting element 58 is guided parallel to the surface of the first contact carrier 26. The points of the fixed connections on the rated current contact 14 and on the contact carrier 26 and the length of the flexible connecting element 58 are selected such that the rated current contact 14 is displaceable by the necessary distance for opening or closing the circuit breaker 10 in the direction of the longitudinal axis A. If a band is used for the connecting element 58, the direction of the width of the band preferably extends in the circumferential direction to the rated current contact 14 or the contact carrier 26. This ensures that the band when moving the rated current contact 14 in between the rated current contact 14 and the contact carrier 26th trained annular gap is unrolled, since the band around axes in the direction of the width has a great flexibility.

The between the Gegennennstromkontakt 24, which is part of the second contact carrier 22, and the Gegenabbrandkontakt 20, which is part of the Gegenschaltstücks 18, arranged flexible connecting element 58 'is also arranged U-shaped. The connecting element initially leads in the direction of that for contacting the Abbrandkontaktes 16 certain end, parallel to the surface of Gegenabbrandkontaktes 20 and then applies in a U-shaped arc, so that the other end portion of the connecting element 58 'is fixedly disposed on the Gegennennstromkontakt 24, wherein the other end portion of the connecting element 58' parallel to the surface of the Gegennennstromkontakts 24 is guided. The points of the fixed connections on the counter-current contact 24 and on the counter-erosion contact 20 and the length of the flexible connection element 58 'are chosen such that the counter-erosion contact 20 is displaceable by the necessary distance for opening or closing the circuit breaker 10 in the direction of the longitudinal axis A. Again, a band is preferably used for the connector 58 '.

3 and 4 show three further possible arrangements of the arranged between the contact piece 12 and the first contact carrier 26 flexible connecting element 58 and two other possible arrangements of between the counter-contact piece 18 and the second contact carrier 22 arranged flexible connecting element 58 '. The in the 3 and 4 shown circuit breaker 10 is otherwise formed largely the same as the in Fig. 1 and 2 shown.

Instead of between the contact piece 12 and the first contact carrier 26, the flexible connecting element 58 may also be arranged between the contact carrier 26 and the Abbrandkontakt 16 of the contact piece 12. 3 and 4 show two possible arrangements.

In one arrangement, the flexible connection element 58 is arranged between the cylinder section 28 of the first contact carrier 26 and the consumable contact 16.

In the other arrangement, the flexible connecting member 58 between the end plate 30 of the first contact carrier 26 and the Abbrandkontakt 16 of Switching piece 12 is arranged. From the end plate 30, the flexible connecting element 58 initially leads radially outward and then leads back in a U-shaped arc in the direction of the Abbrandkontaktes 16. The end region, by means of which the connecting element 58 is arranged on Abbrandkontakt 16, in the radial direction with respect to the longitudinal axis A sufficient. In order to arrange the flexible connecting element 58 at the Abbrandkontakt 16 stationary, this has a radially projecting mounting member.

Next is in 3 and 4 an arrangement of the flexible connecting element 58 is shown in which this is arranged between the rated current contact 14 and the first contact carrier 26 associated lateral shielding element 62. The lateral shielding element 62 is arranged radially outside the rated current contact 14. The flexible connecting element 58 is arranged between this and the rated current contact 14 S-shaped.

In 3 and 4 Two further possible arrangements of the flexible connecting element 58 'between the mating contact piece 18 forming counter consumable contact 20 and the second contact carrier 22 are shown. Instead of in Fig. 1 and 2 shown U-shaped arrangement, the flexible connecting element 58 'may also be arranged in an S-shape.

Another possibility is to arrange the flexible connecting elements not laterally as described above but at the end relative to the contact piece 12 or relative to the counterpart contact piece 18. In 3 and 4 an example is shown in this regard. The flexible connecting element 58 'is guided from the end of the counter consumable contact 20 facing away from the contact piece 12 to a point of the second contact carrier 22 which lies on the longitudinal axis A. The flexible connecting element 58 'is therefore arranged at the end on the counter-switching piece 18. Likewise, the am Switching piece 12 attached flexible connecting element 58 end be arranged on the contact piece 12.

Preferably, a plurality of flexible connecting elements are used, which are arranged symmetrically with respect to the longitudinal axis A. For example, six connecting elements 58, 58 'are arranged at a distance of 60 ° to one another in the circumferential direction.

Instead of the formation of the flexible connecting element as a band, this can be formed flat, in particular as a rotationally symmetrical body about the longitudinal axis A around. The cross section of such a body thus corresponds to the sectional areas of the bands shown in the figures.

LIST OF REFERENCE NUMBERS

10

breakers

12

switching piece

14

Current Rating Contact

16

arcing

18

Against switching piece

20

Gegenabbrandkontakt

22

second contact carrier

24

Against rated current contact

26

first contact carrier

28

cylinder section

30

endplate

32

Annular disk

34

insulating

36

contact fingers

36 '

tulip contact

38

heating volume

40

flask volume

42

heating duct

44

Arc zone

46

separating element

48

Überdruckvnetil

50

contact fingers

52

transmission

54

drive rod

56

wheel

58, 58 '

flexible connection element

60

annular gap

62

shielding

A

longitudinal axis

Claims (12)

Circuit breaker having a movable contact piece (12) and a first contact carrier (26) associated with the contact piece (12), the contact piece (12) being electrically conductively connected to the first contact support (26) via a connecting element (58) associated therewith Counterpart piece (18) and a second contact carrier (22) assigned to the counterpart contact piece (18), wherein the counterpart contact piece (18) is electrically conductively connected to the second contact carrier (22) via a connecting element (58 ') assigned to it, and wherein the counterpart contact piece ( 18) is intended with the switching piece (12) for closing the circuit breaker (10) to produce an electrically conductive, re-separable connection, characterized in that at least one connecting element (58) which is associated with the switching piece (12), flexible and on the one hand on the first contact carrier (26) and on the other hand on the contact piece (12) is arranged stationary and that min First, a connecting element (58 ') which is the counterpart switching piece (18) associated, flexibly formed and on the one hand on the second contact carrier (22) and on the other hand on the counter-switching piece (18) is arranged stationary. Circuit breaker according to claim 1, characterized in that all connecting elements are flexible and / or the switching piece (12) associated with connecting element (58) on the one hand on the first contact carrier (26) and on the other hand on the contact piece (12) is fixedly arranged and the opposite switching piece ( 18) associated connecting element (58 ') on the one hand on the second contact carrier (22) and on the other hand on the counter-switching piece (18) is arranged stationary. Circuit breaker according to claim 1 or 2, characterized in that the switching piece (12) has a relative to the first contact carrier (26) movable rated current contact (14) and a movable Abbrandkontakt (16) and / or the counter-contact piece (18) by a movable Gegenabbrandkontakt ( 20) is formed. Circuit breaker, according to claim 3, characterized in that the rated current contact (14) of the contact piece (12) via this switching piece (12) associated flexible connecting element (58) is contacted, which on the one hand stationary on the rated current contact (14) and on the other hand stationary on the first contact carrier (26) is arranged. Circuit breaker according to one of claims 1 to 4, characterized in that at least one of the connecting elements (58, 58 ') is a continuous, elongate conductor element, in particular a conductor strip. Circuit breaker according to one of claims 1 to 5, characterized in that the flexible connecting element (58, 58 ') each end an attachment end region which is in particular rigid. Circuit breaker according to one of claims 1 to 6, characterized in that at least one of the connecting elements is a planar conductor. Circuit breaker according to one of claims 1 to 7, characterized in that at least one of the connecting elements (58, 58 ') is at least partially tissue-like, knitted, knitted or fleece-like. Circuit breaker according to one of claims 1 to 7, characterized in that at least one of flexible connecting elements (58, 58 ') is sheet-like, in particular of a sheet metal and particularly preferably of spring steel sheet. Circuit breaker according to one of claims 1 to 9, characterized in that the flexible connecting elements (58, 58 ') laterally and / or end on the switching piece (12) or on the counter-switching piece (18) are arranged. Circuit breaker according to one of the preceding claims, characterized in that the switching piece (12) and the counter-switching piece (18) along a longitudinal axis (A) are movable, and that a plurality of connecting elements (58, 58 ') are arranged symmetrically with respect to the longitudinal axis (A) , Line switch according to one of the preceding claims, characterized by the design as a compressed gas switch, in particular as a self-blowing switch.

Images