EP2898525A1 - Kontaktsystem eines leistungsschutzschalters - Google Patents
Kontaktsystem eines leistungsschutzschaltersInfo
- Publication number
- EP2898525A1 EP2898525A1 EP13771417.6A EP13771417A EP2898525A1 EP 2898525 A1 EP2898525 A1 EP 2898525A1 EP 13771417 A EP13771417 A EP 13771417A EP 2898525 A1 EP2898525 A1 EP 2898525A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact
- lever
- arm
- contact arm
- spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/50—Manual reset mechanisms which may be also used for manual release
- H01H71/505—Latching devices between operating and release mechanism
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
- H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
- H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
- H01H77/102—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement
- H01H77/105—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement whereby the blow-off movement unlatches the contact from a contact holder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
- H01H3/3031—Means for locking the spring in a charged state
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/22—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release
- H01H73/26—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release reset by tumbler
Definitions
- the present invention relates to a contact system of a circuit breaker, more particularly to a low-voltage circuit breaker or motor protection switch having improved functions and characteristics.
- Contact systems of circuit breakers for at least one pole are equipped with a contact arm designed as a moving contact, wherein the contact arm is acted upon by a contact force spring for generating a contact pressure in the closed position.
- the contact arm is rotatably mounted about a contact arm pivot in a switch housing in which the low voltage switch is actuated.
- the contact force spring may be stationarily supported in the switch and act as a compression spring, a lever end of the contact arm (DE 3818864A1).
- DE 28 51 817 C3 describes a low-voltage circuit breaker in which a helical compression spring acting as a contact force spring is arranged between a contact piece carrier and a movable contact piece which is pivotably held on the contact piece carrier by means of a hinge pin in the form of a contact arm.
- the existing of the movable contact piece and the contact piece carrier assembly is in turn mounted on a shift shaft and can be operated via two coupled via a knee joint pin toggle.
- One of the toggle lever engages the hinge pin, the other is supported on a main pawl, which is pivotable about a hinge pin and is supported with its other end in the latched state of the switch on a latch member, which in turn by a substantially planar two-armed, around a pivot bearing swivel lever trained intermediate pawl is held in a Verklinkungsdian. Due to a special design of this complex, consisting of main pawl, intermediate pawl and locking member Verklinkungssystems the forces occurring during unlatching can be absorbed as low as possible.
- the object of this invention is to provide a concept of a low-voltage circuit breaker, in which one can make do with a reduced spring force in the contact system, which provides better parameters for an optimal setting, and in which a better balance between forces and dimensions is possible.
- An essential core of the contact system according to the invention in its first embodiment is that the contact force spring is arranged between the contact arm and a lever which is rotatable about a lever pivot point.
- the contact force spring acts on both sides of the contact arm and the lever and is otherwise not supported.
- Position of the contact arm pivot point and position of the lever pivot point and lengths of lever and contact arm are dimensioned to each other so that a resultant contact force generating torque is present on the contact arm, wherein the rotatable lever and the contact arm with manual switch operation via a handle in each position of the contact system between ON and OFF (manual opening and closing) and latched back together.
- condition 'latched' means that the lever and the contact arm have a closely spaced distance from each other and are rotatable in a given sequence of movements.
- the tension of the contact force spring is defined in this state.
- Lever and contact arm unlatch when an electrodynamically induced opening movement (short circuit or overcurrent).
- the latching is again achieved by tensioning (reset) the contact system.
- One of the advantages of the invention is that, after the electrodynamically induced opening movement, the contact can not re-collapse because the contact force spring is disengaged from the contact arm.
- the contact force springs in the embodiments may be formed with a lower spring force, as is the case with conventional switching systems.
- the advantage is based on the fact that the lever arms are made larger, whereby the torque generating the contact force can be supplied by a correspondingly reduced spring force.
- the spring forces can be reduced to about one fifth or one quarter, whereby the - so far very high - requirements for the mechanical quality of the contact force springs can be reduced.
- the contact system may be designed as a single contact or as a double breaker.
- the contact and contact separation can take place between moving contacts and fixed contacts in air, vacuum or inert gas.
- the construction according to the invention in all embodiments is designed so that the one or more rotatable (s) lever and the or the contact arm (s) remain latched together with manual switch operation via the handle in any position of the contact system.
- Lever and Grekraftarm (e) unlatched in an electrodynamically or when acted upon by a trigger-operatively connected trigger element caused opening.
- a transfer of the contact system in the normal position after electrodynamically induced or effected by the trigger element opening lock lever and contact arm (e) again.
- the double-breaker type contact system has a symmetrical structure around the contact arm center, in which the contact arm is formed as a two-arm, symmetrical moving contact rotatably mounted in its center, and one rotatable lever is disposed on each side of the contact arm is disposed between one side of the contact arm and one of the rotatable levers, in turn, the contact force springs act on both sides contact arm and lever
- Contact arm and lever are arranged with their axes of rotation axially parallel in a switching shaft or in a switching shaft segment.
- the rotatable lever can be designed with one arm or two arms
- the lever has at its free end a nose intended for latching with the contact arm.
- the contact arm can also be designed with one arm or two arms.
- lever and contact arm lever and contact are each installed so that one arm is mounted in the direction of the contact.
- lever and contact arm of the two-armed lever and the two-armed contact arm are each installed so that their first arm are mounted in the direction of the contact and the second arm in the opposite direction.
- the formed in the opposite direction of the second arms may be formed angled relative to the position of the first arm. Lever and contact arm are therefore not present in a stretched form.
- the contact arm may have a window through which the lever engages.
- This construction has the advantage that contact arm and lever can be arranged in a plane perpendicular to their pivot points.
- contact arm and lever are arranged adjacent.
- the contact force spring may be formed as a tension spring, as a compression spring, as a leaf spring or as a spiral spring.
- Contact arm and / or lever may each have a holding element to which the contact force spring is permanently attached between the contact arm and lever.
- the contact force spring is located between the contact arm and the rotatable lever in the form of a tension spring or a compression spring.
- the contact force spring is arranged at one end to be rotatable about a spring pivot point, and the contact force spring at the other end (with its free end) acts on the contact arm with a torque generating the contact force.
- the contact force spring is preferably formed as einschenklige leaf spring.
- a leaf spring has about a half of its length on a bulge, with which a support against the contact arm is set up.
- the free end of the leaf spring may be formed as a tongue which abuts the contact arm (in the latched state).
- the contact arm has a holding element, against which, in particular designed as a leaf spring contact force spring is supported at least in the Verklinktgov.
- FIG. 1A schematic representation of a first embodiment with ON switched
- FIG. FIG. 1B is a schematic representation of a first embodiment with the contact system switched off;
- FIG. 1B is a schematic representation of a first embodiment with the contact system switched off;
- FIG. 2 a contact system during an electrodynamically induced
- FIG. 3 another contact system with tension spring between moving contact arm and lever
- FIG. 4 a (first) contact system with leaf spring as a contact force spring
- FIG. 5 a (second) contact system with leaf spring as a contact force spring
- FIG. 6 a contact system as a double breaker
- FIG. 7 a variant of the first embodiment
- FIG. 8 a variant of the further contact system
- FIG. 9 another variant of the first embodiment with ON switched
- FIG. 10 the further variant of the first embodiment with OFF switched
- FIG. 11 a variant of the contact system as a double breaker.
- the contact system for a low-voltage switch for at least one pole in a switch housing, in which the switch can be actuated is equipped with a contact arm 10 designed as a moving contact. This can be designed as a single arm in a single contact in a first embodiment and in a second embodiment in two arms. Furthermore, a double breaker (see FIG 6) is presented, the contact arm is also formed with two arms. The contact arm is rotatably mounted about a pivot point 12 and is acted upon by a contact force spring 18, 18 "19, 19 ', 19", 27, 27' for generating the contact pressure. As usual with low-voltage switches, the contact system has a lift-through gap 15.
- Lever 21 and contact arm 10 are mounted axially parallel in the shift shaft 13.
- a rotatable lever 21 is mounted about a pivot point 23 and engages with its free (front) end by a trained in contact arm 10 window 16.
- the lever 21 carries a nose 24, which is formed in the direction of the contact arm 10. Lever 21 and the contact arm 10 are latched together via the nose 24, as long as they are not subjected to an electrodynamically induced opening movement.
- the Verklinkt ein is solved in an electrodynamically induced opening movement.
- electrical direct or alternating currents exert a magnetic field on current-conducting paths (Lorentz forces).
- Lorentz forces are utilized in particular at higher currents, such as overload or short-circuit currents, when opening a contact system, where these forces contribute to the accelerated opening movement of the moving contact 10.
- the fixed contact carrier (8) U-shaped - can be designed as a conductor loop - and can be provided with a connection conductor or a terminal.
- Figures lA and 1B show the contact system in the two - made by manual operation on the handle 7 - end positions of the switch in ON (FIG 1 A) and OFF (FIG 1B).
- the rotatable lever 21 and the contact arm 10 are latched together with manual switch operation on the handle 7 in each position of the contact system between ON and OFF and back, previously referred to as 'normal position'.
- FIG. 1B a position of the components is shown where, via the operating handle (handle 7), the switching shaft 13 is turned to the left and thus the contact system is opened (switched OFF).
- the contact force spring 19 - designed here as a compression spring - is arranged solely between the contact arm 10 and the lever 21. Compared to other known contact systems, the contact force spring is not supported in the switching shaft or elsewhere in the housing.
- the position of the pivot points (23, 12) of the lever 21 and contact arm 10, those of the points of contact of the contact force spring 19 on the lever 21 and the contact arm 10 and mediated by the contact force spring (pressure spring) 19 forces provide right and left rotation Torques.
- the resultant of all torques in the latched position, for example in the closed position, of the contact system is (with respect to the drawing) a right-handed moment, which occurs as a contact force.
- the lever 21 is latched over the end present nose 24 with the contact arm 10. After opening the contact by spin-coating with electrodynamic force development in an overcurrent triggers the latching.
- the contact arm 10 has a holding element (see in particular the reference numerals 11 and 20 in FIG. 3), against which the contact force spring 18 (19) is supported or attached there.
- the contact force spring is arranged captive between the contact arm and lever.
- the contact force spring may be formed in a suitable manner almost as any spring element; here are tension spring, compression spring, leaf spring or coil spring in question.
- Retaining elements (11, 20) of the respectively used contact force spring as contact or support points on the lever 22 or on the contact arm 10 may be: hooks, pins, flanging or the like.
- the latch between rotatable lever and contact arm is achieved in that the lever has at its free end for latching with the contact arm 10 specific nose 24.
- the Verklinkungsstelle in or on the contact arm may be an abutment, a pin or an edge.
- a window 16 for the passage of the free end of the lever 21 is present in the contact arm.
- the mentioned nose 24 engages in the Verklinktwolf in the front, extending to the moving contact portion of the contact arm on an edge of the window.
- lever 22 engages the contact arm 10 from above (see FIG.
- the respective embodiments differ in that in the construction "lever from below” a compression spring and in the construction "lever from above” a tension spring is used as a contact force spring. Both constructions have in common that the free front end of the lever acts on the side of the contact arm, which lies opposite the moving contact piece.
- FIG. 2 shows an intermediate position of the contact system during an electrodynamically initiated opening movement with lever 21, contact arm 10 and fixed contact 8 shortly after opening the contact.
- the switching shaft 13 retains its position in the described opening movement, it is not moved.
- the nose 24 on the lever 21 loses the support on the contact arm and leaves the Verklinkt ein.
- the force of the compression spring 19 hurls the contact arm in its full open position.
- With reference numeral 14 'stops are located against which the lever falls back, or is supported.
- a special feature of the invention is that no retro-rotating forces occur on the contact arm and the contact system does not close again.
- Many low-voltage switches with contact force spring are structurally designed so that the contact-closing effect of the contact force spring is present after opening of the contact and remains present. Feathers or bounces of the system would pass through the contact closing spring force close the contact again.
- the contact system can be returned to the ON position.
- the contact arm with the moving contact piece comes to lie on the fixed contact (fixed contact piece) (again as in FIG. 1B).
- the latch is available again.
- FIG. 3 shows another contact system according to the invention with tension spring between the moving contact arm and the lever.
- the lever 22 engages in this embodiment of the top of the contact arm; in contrast to the embodiment according to FIG. 1, where the rotatable lever engages coming from below on the contact arm.
- tension spring 18 and contact arm 10 holding elements 11 and 20 are shown, which ensure that the spring 18 remain captive arranged on the contact arm 10 and the lever.
- the front end 24 of the lever is located on the contact arm 10.
- the here designed as a tension spring 18 contact force spring generates the contact force.
- the forces of the contact force spring 18 with the pivot points (23, 12) on the lever 22 and on the contact arm 10 provide a right-handed torque as a contact force in the closed position.
- FIG. 4 and FIG. 5 show two further contact systems, in which preferably a leaf spring is used as a contact force spring.
- the contact force spring and lever form a one-piece, one-piece component 27, 27 'rotatably mounted about a pivot point (23).
- the contact force spring and lever are fused in a single, one-limbed and rotatable about a pivot element.
- FIG. 4 a contact system is shown in which the leaf spring 27 - similar to the lever 21 shown in FIG. 1 - from below attacks the contact arm. Comparable are the presence of a nose or tongue 24 at the front end of the leaf spring and the passage of the leaf spring 27 through an opening 16 in the contact arm.
- the leaf spring 27 has a bulge 28 in the direction of the contact arm, with which an immediate power transmission comes about. It accounts in this embodiment retaining elements between the spring (27) and contact arm, as in the contact system of FIG. 1 or FIG. 3 (see there reference numerals 11 and 20) are present.
- a second contact system with leaf spring 27 ' is shown as a contact force spring, where leaf spring 27' engages the contact arm from above, similar to FIG. 3, where also a lever 22 engages the contact arm.
- a driver 30 is present, on which the upwardly curved leaf spring 27 'is supported.
- FIG. 6 presented a contact system according to the invention as a double breaker 6.
- the contact arm 10 ' is formed as a rotatably mounted in its center 12 two-armed symmetrical moving contact 10'.
- the contact arm 10 ' is mounted in a slot 41.
- a rotatable lever 21 ' is arranged on each arm side, and each a contact force spring 19' is disposed between one side of the contact arm 10 'and one of the rotatable levers 2 ⁇ .
- the contact force springs 19 ' are compression springs.
- the lever 2 ⁇ engage through a respective window 16 on one arm side by the contact arm.
- the levers 2 ⁇ have at their front end a nose 24.
- the rotatable lever 21 ' in the normal position with the contact arm 10' in a Verklinktgna and leave prompt by electrodynamic opening the Verklinktgna.
- the rotatable levers 2 ⁇ again reach the latching position.
- the contact arm with the moving contact piece comes to rest on the fixed contact (fixed contact piece) (again as in FIG. 1).
- FIG. 6 The function of the invention according to FIG. FIG. 6 is immediately used as a transmission of the description of FIG. 1 recognizable to the expert.
- FIGS. 7 and 8 show variants of embodiments of a single contact. Details which have already been described and which are identical in FIG. 7 and FIG. 8 appear again will not be explained again.
- the lever 21 “, 22" and the contact arm 10 are each formed with two arms, one arm 10A, 21A, 22A being supported in the direction of the contact and the second arm 10B, 21B, 22B being supported in the opposite direction.
- Their second arm 10B, 21B, 22B is angled in accordance with the configuration shown in these two figures In Figure 7, the second arms 10B, 21B of lever 21 "and contact arm 10" form an obtuse angle with the first arms 10A, 21A ,
- FIG. 7 the embodiment according to FIG 7 essentially corresponds in function to the embodiment according to FIGS 1A, 1B and 2. Furthermore, between tension spring 18 "and the second arm 10B of the contact arm 10" holding elements are shown, whereby the tension spring 18 "remains captive arranged.
- FIG. 8 is a variant of the further contact system, according to FIG. 3, before.
- the variants of FIG. 3 and FIG. 8 show an embodiment with a contact force spring 19 ", which is designed as a compression spring.
- the above-mentioned embodiments have in common that the one or more rotatable levers in 'normal' contact open or close with the contact arm are in a Verklinktgna. Leave lever and contact arm - caused by electrodynamic opening - the Verklinktgna. After a reset process, the or the Lever again in the Verklinktgna.
- FIG. 9 and FIG. 10 show a further variant of the first contact system according to FIGS. 1A, 1B and 2.
- a release element 42 mounted displaceably in the switch housing is provided here.
- the triggering element 42 is in direct or indirect operative connection with conventional triggers, which in the case of tripping, i. If faulty currents occur, apply the triggering element in release direction D.
- the trigger element 42 is not shown by conventional spring means in the in FIG. 9 shown rest position held. Upon actuation of the trigger element 42, this meets according to FIG. 10 on the lever 21 and releases it from the Verklinkung with the contact arm 10, which then pivots under the action of the contact force spring 19 in the open position to the stop 14. After a release caused electrodynamically or by tripping the lever 21 passes through a reset process again in the Verklinktgna.
- tripping elements 42 provided on the pole are connected via a transverse web 43.
- FIG. 11 shows a variant of the double-breaker contact system according to FIG. 6.
- a trigger element 42 ' is provided, which is rotatably mounted in a formed in the switch housing or on the switching shaft pivot axis 47.
- the trigger element 42 ' is held by not shown conventional spring means in the rest position shown.
- the triggering element 42 ' is in direct or indirect operative connection with conventional triggers, which act on the tripping element in the release direction D' when triggered.
- the trigger member 42 hits on the levers 2 ⁇ provided drivers 45 and takes them in the counterclockwise direction, which the lever 21' from the latching with the associated arms of the double-arm contact arm 10 'triggers.
- the contact arm 10 pivots thereon under the action of the contact force springs 19' in the open position. After an electrodynamic or caused by triggering unlatching reach the lever 21 'by a reset process again in the Verklinktgna.
- multi-pole switches are provided polweise triggering elements 42 'connected via a transverse web 43'.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012108849 | 2012-09-20 | ||
PCT/EP2013/069433 WO2014044739A1 (de) | 2012-09-20 | 2013-09-19 | Kontaktsystem eines leistungsschutzschalters |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2898525A1 true EP2898525A1 (de) | 2015-07-29 |
EP2898525B1 EP2898525B1 (de) | 2017-04-26 |
Family
ID=49301442
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13771417.6A Not-in-force EP2898525B1 (de) | 2012-09-20 | 2013-09-19 | Kontaktsystem eines leistungsschutzschalters |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2898525B1 (de) |
WO (1) | WO2014044739A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114188175B (zh) * | 2021-10-21 | 2023-09-05 | 合肥联宝信息技术有限公司 | 触发开关及电子装置 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1553328A (de) * | 1967-01-30 | 1969-01-10 | ||
DE2851817C3 (de) | 1978-04-19 | 1984-10-18 | Siemens AG, 1000 Berlin und 8000 München | Niederspannungs-Schutzschalter mit einer Hauptklinke, einer Zwischenklinke und einem Sperrglied |
ZA783171B (en) * | 1978-06-02 | 1979-09-26 | Heinemann Electric Ltd | Improvements relating to electrical switches |
DE3818864A1 (de) | 1988-06-03 | 1989-12-14 | Kloeckner Moeller Elektrizit | Stromunterbrecher mit lichtbogenbegrenzungseinrichtung |
DE4222965C1 (de) * | 1992-07-13 | 1993-11-25 | Kloeckner Moeller Gmbh | Kontaktsystem für einen Schalter, insbesondere für einen Leistungs- bzw. Schutzschalter |
-
2013
- 2013-09-19 EP EP13771417.6A patent/EP2898525B1/de not_active Not-in-force
- 2013-09-19 WO PCT/EP2013/069433 patent/WO2014044739A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2014044739A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2014044739A1 (de) | 2014-03-27 |
EP2898525B1 (de) | 2017-04-26 |
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