EP0640242A1 - Kontaktfederanordnung für ein relais zum führen und schalten hoher ströme. - Google Patents
Kontaktfederanordnung für ein relais zum führen und schalten hoher ströme.Info
- Publication number
- EP0640242A1 EP0640242A1 EP93909764A EP93909764A EP0640242A1 EP 0640242 A1 EP0640242 A1 EP 0640242A1 EP 93909764 A EP93909764 A EP 93909764A EP 93909764 A EP93909764 A EP 93909764A EP 0640242 A1 EP0640242 A1 EP 0640242A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact
- spring
- contact spring
- gap
- current
- 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
- 229910001316 Ag alloy Inorganic materials 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims 1
- 229910052721 tungsten Inorganic materials 0.000 claims 1
- 239000010937 tungsten Substances 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 9
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052709 silver Inorganic materials 0.000 abstract description 5
- 239000004332 silver Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 5
- 230000005520 electrodynamics Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000005293 physical law Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
- H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H51/00—Electromagnetic relays
- H01H51/22—Polarised relays
- H01H51/2272—Polarised relays comprising rockable armature, rocking movement around central axis parallel to the main plane of the armature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/38—Auxiliary contacts on to which the arc is transferred from the main contacts
Definitions
- the invention relates to a contact spring arrangement for a relay for guiding and switching high currents with at least one elongated contact spring carrying a contact piece, which cooperates with a fixed counter contact element, also carrying a contact piece, and with at least one rigid connecting leg for the contacts clock spring, which runs approximately parallel to this with the formation of a spring gap on the side opposite the contact piece and which leads the switching current in a direction opposite to the contact spring.
- So-called miniature switching relays are used to connect devices to the mains voltage in the home and in industry. In a relatively small design with spring contacts, they can handle the current loads in these applications down to the 50 A range. For higher currents, contactors are generally used, which are equipped from the outset with differently designed contact elements and correspondingly stronger drive systems for their application areas, but are accordingly also considerably larger in size than the relays mentioned.
- the aim of the invention is to provide a dimensioning for such a contact spring arrangement of the type mentioned at the outset, with which the welding of the contact pieces can be reliably prevented even when the highest short-circuit currents occur.
- the spring gap extends at least approximately over the entire length of the contact spring from its attachment point to the contact piece and in that the ratio of the length to the distance in the spring gap when the contact is closed roughly satisfies the following condition:
- Hs limit heating strength or current carrying capacity of the contact material [- ⁇ -]. This formula is based on simplified assumptions for the mechanical behavior of the contact spring arrangement described. For the short exposure time of the short circuit pulse ( ⁇ 5 ms) z. For example, consider the spring as a rigid body. Thus, the positive effect in the experiment begins at around 2/3 of the theoretical value of L / D.
- the spring gap formed between the contact spring and its connecting element is so dimensioned that the repulsive forces generated by the current loop, which endeavor to close the contact on the opposite side of the spring, are greater even at the highest short-circuit currents than the opposing forces that seek to open the contact.
- limit heating strength or current carrying capacity which in turn is defined as the quotient of the welding limit current strength [kA 2 ] and the contact force N] and is a constant for a specific material.
- FIG. 3 shows an illustration of the design principle according to the invention on a schematically shown contact spring arrangement
- Figure 4 shows a development of the invention with a multiply folded contact spring
- Figure 5 is a schematic representation of a conventional contact spring arrangement in relays to explain the different mode of operation compared to the invention.
- a magnetic system with a coil, a core 3, two yokes 4, a permanent magnet 5 and a rocker armature 6 is arranged in a base body 1 from above.
- An actuating finger 7 of the armature actuates a contact spring 9 via a slide 8, which in this example is split into a main spring leg 10 and a forward spring leg 11.
- a spring support 12 extends from its connecting pin 12a to the fastening point 12b for the contact spring 9 approximately parallel to the latter, whereby a spring gap 13 is formed.
- the contact pieces 14 and 15 of the contact spring 9 are located above the connecting pin 12a on the side opposite the spring support 12. They interact with corresponding contact pieces 16 and 17 of a counter-contact element 18 which, like the spring support 12, is anchored by inserting it into slots in the base body and has a connecting pin 18a.
- the spring support 12 is thus in the area between the contact piece 14 and the attachment point 12b to the contact Spring 9 approximates that the length of the spring gap 13 is more than 30 times, but at least 20 times, as large as the average distance between the spring support 12 and the contact spring 9.
- the repulsive force between the spring support 12 and the contact spring 9 is high Short-circuit currents so strong that a brief lifting of the contact piece 14 from the contact piece 16 is avoided and welding of the contact is prevented.
- the counter-contact element 18 "is arranged transversely to the spring support 12 in this case.
- the moving contact spring is not opposed by large metal parts which could lead to eddy current forces. Such eddy current forces could otherwise impair the desired repulsion of the current loop.
- FIG. 5 shows a conventional set of contact springs with a switching contact spring 21 and a counter-contact spring 22, each of which closes a circuit via contact pieces 23 and 24, respectively.
- the forces F ⁇ of such constructions according to FIG. 5 move at most in the region of less than 50 cN, since the distance D is in the order of twice the contact piece height.
- the decisive geometry factor is the ratio of L / D with numerical values of less than 10.
- DE 40 26 425 C1 describes a measure to use the current loop with mutually encompassing contact springs to increase the contact force and to prevent the contacts from opening in the event of short-circuits.
- the current loop is formed by two contact elements which, when the contacts are open, have different potentials and thus, in normal switching operation, raise the risk of an arc.
- a current loop is formed between the spring support 12 and the contact spring 9 in the back of the switching contact piece 14, a good electrical conductor as the spring support 12 made of copper and a spring which is sufficiently dimensioned for the current strength i to be conducted, likewise made of a copper alloy , be used.
- this spring On the switching side, this spring carries the contact piece 14, which preferably consists of silver or a silver alloy, such as AgCdO or AgSnO.
- the contact When the contact is closed, the current flows in the spring support 12 in the opposite direction to the current in the contact spring 9.
- the spring and the metal part (spring support 12) are electrically conductively connected at point 12a.
- the dimensioning was not chosen such that the repulsive force generated would have been sufficient to prevent welding in the event of a short circuit.
- the current-dependent force F s is added to the current loop as a result of the opposite-in her current flowing i ⁇ .
- the contact pieces do not lift off in the event of a short circuit and do not weld; if they are smaller, the lifting process described earlier occurs with the risk of welding the contacts.
- the actual contact force F ⁇ can be neglected compared to the loop force F s , so that the previous relationship is simplified:
- D is the spring distance averaged over the entire length L of the spring gap.
- the current loop In normal switching operation with alternating current, the current loop produces micro-oscillating effects in the closed contacts, which advantageously affect the current transmission, ie. H. on the contact resistance.
- Contact spring is folded like an accordion, as shown schematically in Figure 4.
- the folded contact spring 30 has five alternating sections 31, 32, 33, 34 and 35, so that together with the spring support 12 five spring gaps are formed with the corresponding average distances D1, D2, D3, D4 and D5 .
- the sum of all loop lengths L must then meet the above-mentioned conditions in relation to the mean value of all distances D1 to D5, that is to say at least 20 times the value of the average column distance in the case of silver contacts.
- the distances D1 to D5 could be the same and ensured, for example, by thin insulating foils.
- All types of magnetic circuits can be considered as a magnetic drive system for the described contact principle.
- vibration-insulated, polar, especially bistable magnet systems with a central armature are preferred, for example according to the embodiment of FIG. 1.
- the force of the magnet system can be coupled in between the contact spring attachment and the contact piece, but also in the Area between contact piece and the free end of the spring.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Contacts (AREA)
- Relay Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19924216080 DE4216080A1 (de) | 1992-05-15 | 1992-05-15 | Kontaktfedersatz zum Schalten hoher elektrischer Ströme |
DE4216080 | 1992-05-15 | ||
DE4305034 | 1993-02-18 | ||
DE4305034 | 1993-02-18 | ||
PCT/DE1993/000419 WO1993023863A1 (de) | 1992-05-15 | 1993-05-13 | Kontaktfederanordnung für ein relais zum führen und schalten hoher ströme |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0640242A1 true EP0640242A1 (de) | 1995-03-01 |
EP0640242B1 EP0640242B1 (de) | 1995-10-25 |
Family
ID=25914832
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93909764A Expired - Lifetime EP0640242B1 (de) | 1992-05-15 | 1993-05-13 | Kontaktfederanordnung für ein relais zum führen und schalten hoher ströme |
Country Status (7)
Country | Link |
---|---|
US (1) | US5583471A (de) |
EP (1) | EP0640242B1 (de) |
JP (1) | JPH07506697A (de) |
AT (1) | ATE129594T1 (de) |
CZ (1) | CZ271794A3 (de) |
SI (1) | SI9300215A (de) |
WO (1) | WO1993023863A1 (de) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9317260D0 (en) * | 1993-08-19 | 1993-10-06 | Blp Components Ltd | Solenoid operated switching devices |
KR20000069919A (ko) * | 1997-01-06 | 2000-11-25 | 지멘스 일렉트로미케니컬 컴포넌츠, 인코포레이티드 | 계전기 자석 유지 장치 |
GB2353598B (en) * | 1999-08-24 | 2003-09-10 | Siemens Metering Ltd | Improvements in or relating to current measurement |
GB2382467B (en) * | 2001-11-22 | 2004-04-14 | Blp Components Ltd | Electrical contactor apparatus and method |
US8040664B2 (en) * | 2008-05-30 | 2011-10-18 | Itron, Inc. | Meter with integrated high current switch |
WO2011041260A1 (en) * | 2009-09-30 | 2011-04-07 | Itron, Inc. | Utility remote disconnect from a meter reading system |
US8890711B2 (en) | 2009-09-30 | 2014-11-18 | Itron, Inc. | Safety utility reconnect |
US8493232B2 (en) | 2009-09-30 | 2013-07-23 | Itron, Inc. | Gas shut-off valve with feedback |
DE102012006438A1 (de) | 2012-03-30 | 2013-10-02 | Phoenix Contact Gmbh & Co. Kg | Relais mit zwei gegensinnig betätigbaren Schaltern |
DE102012006433B4 (de) | 2012-03-30 | 2014-01-02 | Phoenix Contact Gmbh & Co. Kg | Relais mit verbesserten Isolationseigenschaften |
US9005423B2 (en) | 2012-12-04 | 2015-04-14 | Itron, Inc. | Pipeline communications |
JP2014203783A (ja) * | 2013-04-09 | 2014-10-27 | パナソニック株式会社 | 接点装置およびそれを用いた電磁リレー |
EP2806441B1 (de) * | 2013-05-24 | 2017-07-12 | Tyco Electronics Austria GmbH | Elektrische Schaltvorrichtung und verbesserte Lorentzkraftvorspannung |
GB2520575A (en) | 2013-11-26 | 2015-05-27 | Johnson Electric Sa | Electrical contactor |
GB2520572A (en) | 2013-11-26 | 2015-05-27 | Johnson Electric Sa | Electrical Contactor |
CN104362044B (zh) * | 2014-10-28 | 2017-01-18 | 浙江正泰电器股份有限公司 | 防止大电流触点分离的继电器 |
DE202019103631U1 (de) * | 2019-07-02 | 2019-07-10 | Johnson Electric Germany GmbH & Co. KG | Federbasiertes Kontaktsystem für die Schaltfunktion einer durch elektrischen Strom betriebenen Schalteinrichtung |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3419828A (en) * | 1966-12-13 | 1968-12-31 | Arrow Hart Inc | Means proportional to magnetic flux to bias electric switch contacts closed |
CH677162A5 (de) * | 1989-10-30 | 1991-04-15 | Carlo Cavazzi Electromatic Ag | |
DE4026425C1 (de) * | 1990-08-21 | 1992-02-27 | Siemens Ag, 8000 Muenchen, De |
-
1993
- 1993-04-23 SI SI9300215A patent/SI9300215A/sl unknown
- 1993-05-13 EP EP93909764A patent/EP0640242B1/de not_active Expired - Lifetime
- 1993-05-13 AT AT93909764T patent/ATE129594T1/de not_active IP Right Cessation
- 1993-05-13 JP JP5519767A patent/JPH07506697A/ja active Pending
- 1993-05-13 WO PCT/DE1993/000419 patent/WO1993023863A1/de not_active Application Discontinuation
- 1993-05-13 US US08/335,741 patent/US5583471A/en not_active Expired - Fee Related
- 1993-05-13 CZ CZ942717A patent/CZ271794A3/cs unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9323863A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1993023863A1 (de) | 1993-11-25 |
JPH07506697A (ja) | 1995-07-20 |
CZ271794A3 (en) | 1995-02-15 |
ATE129594T1 (de) | 1995-11-15 |
US5583471A (en) | 1996-12-10 |
SI9300215A (sl) | 1993-12-31 |
EP0640242B1 (de) | 1995-10-25 |
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