EP0917173A2 - Überstromauslöser für Schutzschalter - Google Patents
Überstromauslöser für Schutzschalter Download PDFInfo
- Publication number
- EP0917173A2 EP0917173A2 EP98121257A EP98121257A EP0917173A2 EP 0917173 A2 EP0917173 A2 EP 0917173A2 EP 98121257 A EP98121257 A EP 98121257A EP 98121257 A EP98121257 A EP 98121257A EP 0917173 A2 EP0917173 A2 EP 0917173A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- overcurrent release
- release according
- bimetallic snap
- plunger
- base body
- 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.)
- Withdrawn
Links
Images
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
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
-
- 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
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
- H01H2071/407—Combined electrothermal and electromagnetic mechanisms the thermal element being heated by the coil of the electromagnetic mechanism
Definitions
- Line and motor protection switches are devices which have the purpose of the power supply lines or the Motor against excessive current consumption and thus thermal Protect overload.
- the one operating case is the low impedance short circuit in which extremely high currents arise instantly. This extreme high currents have to be switched off very quickly, what electromagnetic drives are used for.
- the current from the power supply line or to the protected Motor flows through the magnet winding of an electromagnet, that when a critical is exceeded Current limit an armature can move through the switch contacts are opened.
- the other operating case which also leads to a shutdown is one compared to that Short circuit, slight exceeding of the nominal current value starting at around 20%.
- the speed at which such an excess current can be switched off must depend on the severity of the exceedance.
- the trigger time varies between minutes and milliseconds.
- Bimetallic devices used with the help of the circuit breaker or the motor protection switch flowing electricity are heated. These bimetallic devices have an integrating characteristic, as it were, by grasping how long a corresponding strong overcurrent flows. It must be ensured that if the nominal current is greatly exceeded, which, however, is clearly below the short circuit case is a relatively quick shutdown via the bimetallic element is achieved.
- DE 36 37 275 C1 is an overcurrent release known for protective switching devices, which is a comparatively short response time when the Has nominal current.
- the arrangement consists of a U-shaped curved iron yoke, the two legs together aligned holes included. In these holes sticks an aluminum tube that serves as a support for a applied magnetic winding is used between the legs of the Eisenjoch.
- an iron core with a through hole in which a plunger is longitudinally displaceable is led.
- the plunger lies against one end an anchor also located in the tube, the using a helical compression spring at a distance from the adjacent end face of the iron core is held.
- This known arrangement is suitable for both to monitor the short circuit case as well as the overcurrent case.
- the consumer current flows through the winding and in the event of a short circuit there will be a magnetic field generates the anchor against the action of the spring the fixed iron core moves, causing the plunger pushed forward and the latch of the release mechanism the switch is unlocked.
- the winding on the aluminum tube serves as heating coil for the bimetallic disc.
- the winding heats up the entire magnetic yoke until the crack temperature the bimetallic snap disc is reached.
- the Snap disc suddenly jumps to the opposite Direction and also pushes the plunger in Direction to the trigger mechanism, with the help a ring shoulder attached to the ram.
- From CH 319 008 is a bimetallic snap switch known who works with a curved bimetallic disc.
- the housing of the bimetal switch detects one inside convex protruding floor on which with the concave side the bimetallic disc rests. Through the A fastening rivet runs in the middle of the bimetallic disc, the the bimetallic disc on the convex case bottom holds on.
- the purpose of this construction is in the rest position corresponding to the cold state good thermal contact between the bimetal disc and manufacture the housing.
- the disc lies both cold and warm with your middle area on the complementary curved base body on. In this area, she is using a Holding member held in the system so that constantly in this Good thermal contact is guaranteed.
- the warming area in the middle area won't either Significantly worsened when the disc is heated slowly into a lower state Radius of curvature creeps. Since the design change by Jumping into the other state is only minor only an extremely small one in the middle of the pane Shape change that does not result in thermal contact noticeably influenced. This leaves a good one Heat coupling exist, which has a fast response time of the system guaranteed.
- the trigger member is cup-shaped and has a collar molded onto a base that interacts with the edge of the bimetallic snap disc. There is an actuation extension on the release link intended.
- the is easy to integrate in an overcurrent switch is preferably a guide device with the base body connected for the trigger link.
- the base body is ferromagnetic short-circuit current monitoring to get integrated.
- a winding that at one end over the Base body protrudes and a cup-like cavity creates.
- an anchor Moved in this cup-like cavity an anchor that is spaced with the help of a compression spring is held to the base body.
- the anchor is a plunger connected by a central bore of the Basic body passes through and the holding member at the same time forms for the snap disc. In this way can with the help of the plunger, which in the base body heat absorbs, additional heat is introduced into the snap disk become.
- the magnetic winding is advantageously designed that no additional magnetic yoke is required which is the thermal inertia of the system in the sense an increase in response time would worsen.
- a further improvement in the response time can be achieved be made self-supporting by the magnetic winding Winding that does not need a carrier on the it is wound up.
- the overcurrent release 1 essentially include a ferromagnetic core 5 as the base body, one opposite the core movable armature 6, a magnet or Heating winding 7 and a bimetallic snap disk 8.
- the ferromagnetic core 5 has seen in cross section a T-shaped shape and consists of one cylindrical portion 9 with an end face 11, the into an umbrella-like head that merges with the other End face 12 forms.
- the cylindrical portion 9 is from a cylindrical outer peripheral surface 13 and one end bounded by the flat end face 11.
- the umbrella-like head forms an edge 14 that is radial protrudes beyond the cylindrical portion 9 and is located at the end opposite the end face 11.
- the edge 14 is flat on its underside 15, while the end face 12 is convex throughout is.
- a cylindrical leads coaxially through the core 5 Bore 16 through.
- the bimetallic snap disk 8 is on the end face 12 arranged. It is known to be one of two thin metal sheets composed circular Disc made of two parallel flat sides 17 and 18 and an edge 19 is limited. she has the Shape of a spherical cap.
- the bimetallic snap disk 8 is able to Warming is suddenly changing its spatial shape.
- the in cold state concave flat side 17 curves in the warm Condition convex through, causing the opposite Flat side 18 becomes concave. The process is reversible.
- a cylindrical plunger leads through the bore 16 21, in the area of its front section with a Ring shoulder 22 is provided.
- the plunger 21 also leads through a central bore 23 in the bimetallic snap disk 8th.
- the plunger 21 protrudes beyond the shoulder 22 and has a front free actuating end 24 which is set up to engage with the lever 2 come.
- the rear end of the plunger 21 leads through a Bore 25 in the cylindrical armature 6.
- the plunger 21 With an open closing head 26 with the armature 6 riveted.
- the bore 25 in the armature 6 goes to the core 5 facing end in an expanded section 27 over, which is limited by a shoulder 28.
- the shoulder 28 forms a contact surface for a helical compression spring 29, the other end of which is located on the end face 11 of the core 9 supports.
- Helical compression spring 29 on the annular shoulder 22 in contact the bimetallic snap disk 8 held, which in turn is thereby pressed against the end face 12.
- the outer diameter of the armature 6 is smaller than the diameter of the cylindrical portion 9.
- the cylindrical outer surface 13 of the core 9 serves as a seat for the magnetic or heating winding 7, the from an appropriately dimensioned hard copper wire 31 consists of several turns into one cylindrical coil is wound.
- the length of this coil 7 is dimensioned so that it is about twice as long as the distance of the end face 11 of the core 5 from the Bottom 15 of the edge 14. This leaves a sufficient cylindrical, cup-shaped interior, the from the inside of the coil 7 and the end face 11 is limited to accommodate the anchor 6, which is in the Idle state with its end face 32 at a distance from the End face 11 is located.
- a cup-shaped guide member 33 In front of the end face 12 is a cup-shaped guide member 33 with a cylindrical tubular collar 34 and a bottom 35 arranged.
- an annular Recess 36 In the free end of the tubular collar 34 is an annular Recess 36 with which the tubular collar 34 engages around the disk-shaped edge 14 of the core 5 on the outside and on this by means of a flare that is not recognizable is, is held.
- stepped bore 38 From the bottom 35 a neck part 37 starts, one Contains stepped bore 38.
- the stepped bore 38 has a larger diameter section 39 and one cylindrical portion 41 with a smaller diameter on one another at a rounded shoulder 42 pass over.
- the bore 38 is to the tubular collar 34 coaxial and thus aligned with the axis of the bore 16 in the ferromagnetic core 5.
- the guide part 38 serves as a guide for one cup-shaped or bell-shaped second plunger of a trigger member 43, the outer diameter of the outer diameter corresponds to the bimetallic snap disk 8 and that with its bell-shaped collar 44 on the edge 19 of the Bimetallic snap disk 8 rests. Radially further inside the bell-shaped collar 44 goes into a tubular one Actuating extension 45 over, which is cylindrical and the outside diameter of the clear width of the section 41 corresponds to the bore 38. Through the tubular The actuation extension 45 guides the plunger 21 through, the length of the plunger 21 and the tubular actuation extension 45 is sized so that both of them end approximately flush.
- the copper wire 31 flowing current has two effects. The one effect is that it is proportional to the current the ferromagnetic Kern heats and also in the air gap between the ferromagnetic core 5 and the ferromagnetic Armature 6 generates a magnetic field. Both that The magnetic field and the heating effect are proportional to the current.
- the coil 7, now predominantly working as a heating coil a temperature that is above the temperature at which the bimetallic snap disc 8 from the shape shown in Fig. 1 in the shape shown in Fig. 2, i.e. the flat side 18 transformed from the convex to the concave shape.
- the temperature generated by the winding 7 spreads gradually towards the bimetallic snap disc 8, the speed of propagation is relatively fast because of the heat capacity of the ferromagnetic core 5 due to its small Volume is low.
- the bimetallic snap disc has 8 in its middle area itself Creeping movements make very good thermal contact with that ferromagnetic core 5. Because of the lack of an external Yokes or a separate bobbin with large The entire arrangement has a total heat capacity has very low heat capacity. With that one can very fast thermal response of the overcurrent switch 1, in those current ranges, which are below the current at which the armature 6 due to magnetic forces, but on the other hand are significantly above the nominal current.
- the good heat transfer to the bimetallic snap disc 8 is additionally improved by the plunger 21, that from inside the core 5 over the ring shoulder 22 heat to the opposite flat side the bimetallic snap disk 8 creates.
- An overcurrent release for circuit breakers or motor protection switch has a very low Response time to.
- the short response time is reached by placing a bimetallic snap disc with the heater is connected that their middle area is independent of creeping movements always in contact with the Heating device stands.
- This heater is from a ferromagnetic core is formed on which without a another yoke placed directly on the magnetic winding which also serves as a heating winding.
- the Bimetallic snap disc is on this heater held with the help of the electromagnetically operated plunger, while another, the electromagnetically operated Tappet coaxial surrounding tappet from the Bimetallic snap disc is moved.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermally Actuated Switches (AREA)
- Breakers (AREA)
Abstract
Description
Claims (17)
- Überstromauslöser (1) für elektrische Schutzschaltgeräte, insbesondere Leitungsschutzschalter oder Motorschutzschalter,mit einem Grundkörper (5), der eine konvex gekrümmte Stirnfläche (12) aufweist,mit einer auf dem Grundkörper (5) befindlichen elektrischen Heizwicklung (7), die dazu eingerichtet ist, von dem zu überwachenden Strom durchflossen zu werden,mit einer einen Rand (19) aufweisenden Bimetall-Schnappscheibe (8), die zwei von der Temperatur abhängige Krümmungszustände aufweist, derart, dass sie im kalten Zustand nach einer Flachseite (17) hin konkav und im heißen Zustand zu dieser Flachseite (17) hin konvex gekrümmt ist, und die mit ihrem mittleren Bereich an der Stirnfläche (12) des Grundkörpers (5) anliegend gehalten ist, derart, dass sie mit ihrer im kalten Zustand konkaven Flachseite (17) der Stirnseite (12) des Grundkörpers (5) zugekehrt ist, während der Rand (19) der Bimetall-Schnappscheibe (8) frei beweglich ist,mit einem Halteglied (21), mittels dem die Bimetall-Schnappscheibe (8) an dem Grundkörper (5) anliegend gehalten ist undmit einem Auslöseglied (43), das dazu eingerichtet ist, mit dem Randbereich (19) der Bimetall-Schnappscheibe (8) zusammenzuwirken.
- Überstromauslöser nach Anspruch 1, dadurch gekennzeichnet, dass die Bimetall-Schnappscheibe (8) kreisförmig ist.
- Überstromauslöser nach Anspruch 1, dadurch gekennzeichnet, dass das Auslöseglied (43) becherförmig ist und einen Kragen (44) sowie einen Boden aufweist, wobei es mit seinem Kragen (44) an dem Randbereich (19) der Bimetall-Schnappscheibe (8) anliegt.
- Überstromauslöser nach Anspruch 1, dadurch gekennzeichnet, dass das Auslöseglied (43) einen Betätigungsfortsatz (45) trägt.
- Überstromauslöser nach Anspruch 4, dadurch gekennzeichnet, dass der Betätigungsfortsatz (45) an dem Boden des Auslöseglieds (43) angeordnet ist und zur dem Kragen (44) entgegengesetzten Seite zeigt.
- Überstromauslöser nach Anspruch 4, dadurch gekennzeichnet, dass das Auslöseglied (43) rotationssymmetrisch ist.
- Überstromauslöser nach Anspruch 5, dadurch gekennzeichnet, dass der Betätigungsfortsatz (45) rohrförmig ist.
- Überstromauslöser nach Anspruch 1, dadurch gekennzeichnet, dass mit dem Grundkörper (5) eine Führungseinrichtung (33) für das Auslöseglied (43) verbunden ist.
- Überstromauslöser nach Anspruch 1, dadurch gekennzeichnet, dass der Grundkörper (5) ferromagnetisch ist.
- Überstromauslöser nach Anspruch 1, dadurch gekennzeichnet, dass die Heizwicklung (7) eine Magnetwicklung bildet.
- Überstromauslöser nach Anspruch 1, dadurch gekennzeichnet, dass der Grundkörper (5) eine Bohrung (16) enthält, in der ein Stößel (21) längsverschieblich geführt ist.
- Überstromauslöser nach Anspruch 11, dadurch gekennzeichnet, dass der Stößel (21) durch die Bimetall-Schnappscheibe (8) hindurchführt.
- Überstromauslöser nach Anspruch 11, dadurch gekennzeichnet, dass der Stößel (21) das Halteglied bildet.
- Überstromauslöser nach Anspruch 11, dadurch gekennzeichnet, dass der Stößel (21) eine Schulter (22) aufweist.
- Überstromauslöser nach Anspruch 11, dadurch gekennzeichnet, dass der Stößel (21) mit einem ferromagnetischen Anker (6) verbunden ist.
- Überstromauslöser nach Anspruch 11, dadurch gekennzeichnet, dass der Stößel (21) in Richtung auf die Anlage gegen die Bimetall-Schnappscheibe (8) vorgespannt ist.
- Überstromauslöser nach Anspruch 1, dadurch gekennzeichnet, dass das Auslöseglied (43) lose beweglich ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19750875 | 1997-11-18 | ||
DE19750875A DE19750875C1 (de) | 1997-11-18 | 1997-11-18 | Überstromauslöser für Schutzschalter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0917173A2 true EP0917173A2 (de) | 1999-05-19 |
EP0917173A3 EP0917173A3 (de) | 1999-07-28 |
Family
ID=7848977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98121257A Withdrawn EP0917173A3 (de) | 1997-11-18 | 1998-11-07 | Überstromauslöser für Schutzschalter |
Country Status (3)
Country | Link |
---|---|
US (1) | US5973585A (de) |
EP (1) | EP0917173A3 (de) |
DE (1) | DE19750875C1 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19847155A1 (de) * | 1998-10-13 | 2000-04-20 | Kopp Heinrich Ag | Überstromauslöser |
DE19914479A1 (de) * | 1999-03-30 | 2000-10-05 | Kopp Heinrich Ag | Thermische Auslöseeinrichtung für Leitungsschutzschalter |
DE19942694C2 (de) * | 1999-09-07 | 2002-06-27 | Eti Elektroelement Dd | Auslöser für elektrische Schutzschalter |
US7140288B2 (en) * | 2002-04-26 | 2006-11-28 | Twerdok John W | Device for shaping a food product |
DE202004007436U1 (de) * | 2004-05-10 | 2004-07-22 | Dreefs Gmbh Schaltgeräte Und Systeme | Elektrisches Leistungssteuergerät |
FR3003394B1 (fr) * | 2013-03-12 | 2015-03-06 | Hager Electro Sas | Actionneur magnetothermique. |
EP2830079B1 (de) * | 2013-07-26 | 2016-05-25 | Siemens Aktiengesellschaft | Bimetalleinheit, Auslöseeinheit, Schutzschalter, Schutzschalterreihe und Verfahren zur Kalibrierung eines Schutzschalters |
DE102014117035A1 (de) * | 2014-11-20 | 2016-05-25 | Eaton Industries (Austria) Gmbh | Leitungsschutzschalter mit passiv beheiztem und auf einem Eisenrückschluss eines elektromagnetischen Auslösers wirkendem Bimetall-Element |
DE102017109210B4 (de) * | 2017-04-28 | 2023-10-12 | Tdk Electronics Ag | Relais |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2175859A (en) * | 1937-01-30 | 1939-10-10 | Westinghouse Electric & Mfg Co | Circuit breaker |
US2515152A (en) * | 1946-07-16 | 1950-07-11 | Raytheon Mfg Co | Switch mechanism adapted for use in a high-frequency heating system |
CH319008A (de) * | 1952-11-14 | 1957-01-31 | Siemens Ag | Thermoschalter |
DE3637275C1 (en) * | 1986-11-03 | 1988-05-05 | Flohr Peter | Overcurrent trip device for protection switching apparatuses |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US33400A (en) * | 1861-10-01 | Improvement in compositions to be | ||
US4288770A (en) * | 1979-11-28 | 1981-09-08 | General Electric Company | Thermal override for static trip circuit breakers |
US4288769A (en) * | 1979-11-28 | 1981-09-08 | General Electric Company | Ambient temperature responsive trip device for static trip circuit breakers |
US4641001A (en) * | 1984-06-15 | 1987-02-03 | Mitsubishi Denki Kabushiki Kaisha | Circuit interrupter |
JPH0119315Y2 (de) * | 1984-09-19 | 1989-06-05 | ||
NL8900007A (nl) * | 1989-01-03 | 1990-08-01 | Holec Syst & Componenten | Stuurinrichting voor een elektrische schakelaar, alsmede een met deze stuurinrichting uitgeruste elektrische schakelaar. |
GB2228829B (en) * | 1989-02-22 | 1992-11-25 | Crabtree Electrical Ind Ltd | Improvements relating to circuit breakers |
FR2661776B1 (fr) * | 1990-05-04 | 1996-05-10 | Merlin Gerin | Declencheur instantane d'un disjoncteur. |
US5107235A (en) * | 1991-01-24 | 1992-04-21 | Square D Company | Current driven actuator with coupled thermal and magnetic actuating elements |
DE4313207A1 (de) * | 1993-04-22 | 1994-10-27 | Kopp Heinrich Ag | Leitungsschutzschalter |
-
1997
- 1997-11-18 DE DE19750875A patent/DE19750875C1/de not_active Revoked
-
1998
- 1998-11-07 EP EP98121257A patent/EP0917173A3/de not_active Withdrawn
- 1998-11-17 US US09/193,924 patent/US5973585A/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2175859A (en) * | 1937-01-30 | 1939-10-10 | Westinghouse Electric & Mfg Co | Circuit breaker |
US2515152A (en) * | 1946-07-16 | 1950-07-11 | Raytheon Mfg Co | Switch mechanism adapted for use in a high-frequency heating system |
CH319008A (de) * | 1952-11-14 | 1957-01-31 | Siemens Ag | Thermoschalter |
DE3637275C1 (en) * | 1986-11-03 | 1988-05-05 | Flohr Peter | Overcurrent trip device for protection switching apparatuses |
Also Published As
Publication number | Publication date |
---|---|
EP0917173A3 (de) | 1999-07-28 |
US5973585A (en) | 1999-10-26 |
DE19750875C1 (de) | 1999-03-18 |
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