EP0782758A1 - Mehrpoliges schütz - Google Patents
Mehrpoliges schützInfo
- Publication number
- EP0782758A1 EP0782758A1 EP95930387A EP95930387A EP0782758A1 EP 0782758 A1 EP0782758 A1 EP 0782758A1 EP 95930387 A EP95930387 A EP 95930387A EP 95930387 A EP95930387 A EP 95930387A EP 0782758 A1 EP0782758 A1 EP 0782758A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- phase
- contactor according
- pole contactor
- armature
- switching device
- 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
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/56—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle
- H01H9/563—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle for multipolar switches, e.g. different timing for different phases, selecting phase with first zero-crossing
Definitions
- the invention relates to a multi-pole contactor with AC drive, with a magnetic coil, a magnetic yoke with eddy current rings and a movable magnet armature.
- AC-actuated magnetic drives from contactors consist of the magnetic coil, the fixed magnetic yoke with eddy current rings and the movable magnetic armature, which carries a bridge support for receiving the switching bridges.
- the statistical actuation of the AC drive does not result in a uniform distribution of the switch-on and switch-off times, but rather a self-synchronization of the switching times with regard to the control phase. This arises when switching on by the dependence of the magnetic armature force or when switching off by the dependence of the decay of the armature force on the phase angle of the control phase.
- the frequency distribution of the switch-on and switch-off times in relation to the phase angle between the three phases of the main circuits is electrically shifted by 120 ° in each case. This creates a different contact load when switching on in the three main circuits, i.e. a different current level of the arcing, and when switching off, i.e. a different current level and duration of the switch-off arcs.
- the maintenance interval for exchanging the main contact pieces of a contactor depends on the contact wear in the most heavily loaded phase. By equalizing the distance between the contact pieces in the In individual phases, the service life of a contactor could be increased.
- the object of the invention is therefore to even out the erosion on the contact pieces in multi-pole contactors.
- phase changeover device which connects the control phase for the magnetic drive alternately to one of the three phases of the main circuit.
- the phase switching device can alternatively work electromechanically or else electronically.
- the invention offers the possibility of avoiding self-synchronization when switching contactors. As a result, the material used for the contact pieces is now largely the same.
- Figure 3 shows an electronic control circuit for a mechanical
- FIG. 4 shows a three-phase changeover switch operated by switching cams
- FIG. 5 shows a camshaft drive used in FIG. 4
- FIG. 6 shows an electronic phase changeover device
- FIG. 7 shows a signal flow diagram associated with FIG. 6 with a shift register.
- FIG. 1 shows the AC1 test and FIG. 2 shows the AC3 test of a known three-pole contactor with an AC drive.
- the material loss of the main contacts on the three phases L1, L2 and L3 is shown.
- the abscissa characterizes the number of operations and the ordinate the respective material loss of the contacts at the individual phases.
- FIGS. 3 to 5 show an electromechanical phase switching device: there is a cam drive which is switched by a defined angle of rotation when the magnet armature opens. The fact that the phase changeover takes place during the opening movement of the magnet armature with the magnet coil switched off ensures that the changeover of the control phase takes place largely without current.
- a safety circuit 30 is shown in detail in FIG. 3, in which a contactor coil 31 is connected in parallel with a relay coil 32. A normally closed auxiliary contact ⁇ _ is controlled by the contactor coil 31, and a normally open relay contact S1 by the relay coil 32.
- the NC auxiliary contact oil is followed by a button S2 and a further button 02 for switching the contactor on and off.
- a safety circuit with a relay contact closer By means of such a safety circuit with a relay contact closer, the contactor is locked in such a way that the changeover from one phase to the next phase takes place with a power pause.
- the latter measure avoids the erosion of the changeover contacts and precludes a phase short circuit during the changeover.
- a switchover device 40 is shown in FIG. 4, which contains three switching cams 41, 42 and 43, in which the offset angle is 120 °, the distance angle 60 ° and the cam angle likewise 60 °. This means that a changeover corresponds to a 120 ° angle of rotation of the camshaft 56.
- the angle of rotation is 30 °
- the closed cam switch begins to open.
- the adjacent, open cam switch begins to close.
- the auxiliary contact opener oil of Figure 3 closes at the angle of rotation> 60 ° or closes with a delay when the armature has reached its open position.
- the three switching cams 41, 42 and 43 drive associated changeover contacts 44, 45 and 46, which are electrically connected on one connection side to one of the three phases L1, L2, L3 and the other connection sides of which are shown in FIG free connection of button 02 with the identification L1 / L2 / L3 are electrically connected.
- the button 02 is just connected to the phase L3 via the switchover contact 46.
- FIG. 5 is a contactor drive 50 from armature 51, yoke 52, associated coil 53, shift rod 54, shift shaft 55 and Camshaft 56 shown.
- the stroke h of the armature 51 has an oversize in relation to the switching path for the reliable advancement of the switching shaft 55 with a rotation angle of 60 °.
- the armature opening path up to the opening of the active cam switch is therefore somewhat more than 1/4 of the armature stroke h, the factor M 1/4 U being derived from the quotient of the degrees 30 ° / 120 ° in FIG. 4, but according to the design specification is less than 1/2 of anchor stroke h.
- the three phases L1, L2 and L3 are connected to three triacs 61, 62 and 63 via fuses which are not identified in detail, the control inputs of which are connected to RC elements 67, 68 and 69 via optocouplers 64, 65 and 66.
- the associated triac 61, 62 or 63 is switched on and the connected outer conductor as the on / off switch 70 for the subsequent magnet coil 75 of the contactor drive, which corresponds functionally to the contactor coil 31 in FIG. 3 Tax phase switched on.
- the switching state of the auxiliary contact opener oil operated by the contactor drive is queried.
- a pulse shaping is carried out between the outputs of the shift register 71 and the inputs of the opto-couplers 64 to 66 in FIG. 6 in such a way that the switch-on edge of the outputs AI to A3 is delayed by approximately 50 ms and the switch-off edge without delay at the time of switching, ie with the Change of contact point From "OPEN” to "CLOSED", the auxiliary contact opener oil takes place.
- a phase short circuit between the triacs 61 to 63 of FIG. 6 is thus avoided.
- the time interval between the switch-off command of the contactor coil or during the fall of the armature and the next switch-on command of the contactor coil of 50 ms ensures a safe switch-off state of the contactor before the next switch-on command.
- the outputs AI to A3 of the shift register 71 or of the associated pulse shaper 72 in FIG. 7 are locked, for example, by Zener diodes, so that when the supply voltage of the electronics falls below a predetermined limit, the triac switches 61 to 64 of the figure are not activated 6 follows. This rules out the possibility of a phase short circuit occurring in the event of an irregular supply voltage due to multiple control.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Relay Circuits (AREA)
- Keying Circuit Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4434074A DE4434074A1 (de) | 1994-09-23 | 1994-09-23 | Mehrpoliges Schütz |
DE4434074 | 1994-09-23 | ||
PCT/DE1995/001241 WO1996009635A1 (de) | 1994-09-23 | 1995-09-11 | Mehrpoliges schütz |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0782758A1 true EP0782758A1 (de) | 1997-07-09 |
EP0782758B1 EP0782758B1 (de) | 1998-07-29 |
Family
ID=6529047
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95930387A Expired - Lifetime EP0782758B1 (de) | 1994-09-23 | 1995-09-11 | Mehrpoliges schütz |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0782758B1 (de) |
DE (2) | DE4434074A1 (de) |
WO (1) | WO1996009635A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19948551C1 (de) * | 1999-10-08 | 2001-07-05 | Siemens Ag | Verfahren zur Vergleichmäßigung von Gesamtabbränden eines elektromagnetischen Schaltgeräts und hiermit korrespondierendes elektromagnetisches Schaltgerät |
DE10051161C1 (de) * | 2000-10-16 | 2002-03-07 | Siemens Ag | Verfahren und Vorrichtung zur Reduzierung des Kontaktabbrandes eines Schaltgerätes |
US6956728B2 (en) * | 2003-02-28 | 2005-10-18 | Eaton Corporation | Method and apparatus to control modular asynchronous contactors |
DE102006014914B3 (de) * | 2006-03-30 | 2007-10-04 | Siemens Ag | Verfahren zum Betreiben eines elektromechanisch betätigten Schaltgerätes und nach diesem Verfahren betriebenes Schaltgerät |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL181198B (nl) * | 1952-09-08 | Chiesi Farma Spa | Werkwijze voor het omzetten van een ontsteking werend steroide in een voor toediening met aerosol geschikte vorm, alsmede aerosol-toebereiding bevattende aldus omgezet steroide. | |
FR2536904B1 (fr) * | 1982-11-29 | 1985-11-08 | Merlin Gerin | Circuit electronique de commande d'un appareillage a fonctionnement multiple equipe d'un mecanisme a electro-aimant |
EP0558868A1 (de) * | 1992-03-06 | 1993-09-08 | ABUS Kransysteme GmbH & Co. KG. | Anordnung für eine Schützspule |
US5440180A (en) * | 1992-09-28 | 1995-08-08 | Eaton Corporation | Microprocessor based electrical contactor with distributed contactor opening |
-
1994
- 1994-09-23 DE DE4434074A patent/DE4434074A1/de not_active Withdrawn
-
1995
- 1995-09-11 EP EP95930387A patent/EP0782758B1/de not_active Expired - Lifetime
- 1995-09-11 WO PCT/DE1995/001241 patent/WO1996009635A1/de active IP Right Grant
- 1995-09-11 DE DE59503009T patent/DE59503009D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9609635A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE4434074A1 (de) | 1996-03-28 |
WO1996009635A1 (de) | 1996-03-28 |
DE59503009D1 (de) | 1998-09-03 |
EP0782758B1 (de) | 1998-07-29 |
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