CN101136293A - A current limiter - Google Patents
A current limiter Download PDFInfo
- Publication number
- CN101136293A CN101136293A CNA2007101409222A CN200710140922A CN101136293A CN 101136293 A CN101136293 A CN 101136293A CN A2007101409222 A CNA2007101409222 A CN A2007101409222A CN 200710140922 A CN200710140922 A CN 200710140922A CN 101136293 A CN101136293 A CN 101136293A
- Authority
- CN
- China
- Prior art keywords
- contact element
- bimetal piece
- demand limiter
- current
- movable contact
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H81/00—Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting
- H01H81/04—Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting electromagnetically operated
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- 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
- H01H71/14—Electrothermal mechanisms
- H01H71/16—Electrothermal mechanisms with bimetal element
-
- 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
- H01H71/50—Manual reset mechanisms which may be also used for manual release
- H01H71/501—Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermally Actuated Switches (AREA)
Abstract
A current limiter (10) comprises an electromagnetic drive unit (30) adapted to limit the current carried by a current circuit by displacing at least one movable contact piece (13, 15) from a responsive stationary contact piece (12, 16) in response to at least one current phase carrying an excessive current. The current limiter (10) further comprises a bimetallic block (18, 19) adapted to undergo such a thermal expansion in response to at least one current phase carrying an excessive current that the bimetallic block (18, 19) after the expansion is adapted to prevent said at least one movable contact piece (13, 15) from returning to contact with the responsive stationary contact piece (12, 16).
Description
Technical field
The present invention relates to a kind of demand limiter.
Background technology
Demand limiter is the device that is used for limiting the electric current of circuit in the low pressure range, and described low pressure range is generally understood as the voltage of covering from 100V to 1000V.Typically, demand limiter is used for limiting the electric current of the circuit that carries three-phase current, and still also possible is that circuit only is a single phase circuit.
Electric current in the restricting circuits can be used to avoid the adverse effect under the overload situations for example.
Demand limiter is a kind of electromechanical switching device, generally includes at least one electromagnetic drive unit, may provide an electromagnetic drive unit mutually corresponding to each.A kind of like this electromagnetic drive unit follow the tracks of at least one in mutually electric current and be used for when detecting super-high-current, limiting this phase or heterogeneous electric current.
A particular problem of demand limiter is, opposite with circuit-breaker or overload relay, because it is available can not prevent after electric current is limited that (respectively) movable contact element from turning back to the locking device of respective stationary contact element, contact element may be welded together, and after this demand limiter can not be operated reliably again.
This problem particularly the operator circuit breaker or overload relay are switched to conducting state and do not eliminate short circuit rise thereby cause opening circuit after can take place.For example, because the contact of demand limiter is according to the tendency that fusing is arranged in the contact of overload relay, the short circuit of repetition may weld together the contact and therefore destroy demand limiter.
DE471947C has disclosed a kind of demand limiter, thereby wherein switching arc is used for making bimetal piece to stand alteration of form and prevents that movable contact point from turning back to make position and closure before contacts cool down.
US2262344 has disclosed a kind of system, and wherein independently heater is used to heat bimetal piece, thereby bimetal piece stands change of shape and mobile moving contact.
Summary of the invention
The objective of the invention is to improve the demand limiter of known kind, make it less sensitive contact weld.This purpose can realize by demand limiter of the present invention.
According to the present invention, a kind of demand limiter is provided, comprise electromagnetic drive unit, this electromagnetic drive unit is in order to respond the current phase that at least one is loaded with super-high-current, remove the electric current that loads the restricting circuits by making at least one movable contact element from the respective fixation contact element, described demand limiter also comprises bimetal piece, being suitable for responding at least one is loaded with the current phase of super-high-current and experiences a kind of like this thermal expansion, make this bimetal piece be suitable for after expansion preventing that described at least one movable contact element from returning and contact with the respective fixation contact element, and described thermal expansion is caused by the Ohmic resistance in the described bimetal piece.This give and time of contact element cooling, if perhaps their melt, given their time of solidifying.Other benefit is that the device structure that obtains is done simple relatively.
Bimetal piece can be suitable for having such geometry after expansion, makes it stop at least one movable contact element to return and contacts with the respective fixation contact element, and this helps avoid and uses complicated or expensive element.
Bimetal piece can be in order to stop the plunger in order to move at least one movable contact element to turn back at least one movable contact element and the contacted position of respective fixation contact element under its swelling state.In this way, be sparing of one's energy, because the size of electromagnetic drive unit is set up and design may be very tediously long time-consuming thereby can avoid revising electromagnetic drive unit.
Bimetal piece can under its swelling state in order to stop electromagnetic drive unit to be got back to detect at least one current phase be loaded with super-high-current before its position occupied.If the structure of electromagnetic drive unit makes it to become possibility, this is a favourable solution, because plunger and contact bridge can not changed.
Bimetal piece can be suitable for experiencing thermal expansion before electromagnetic drive unit moves described at least one movable contact element.This makes easier realization thermal expansion, because after movable contact element moves, may not have the electric current what is available for heating in demand limiter.
If demand limiter also comprises the electric current that is used for reducing flowing through described bimetal piece or across the unit of the voltage of bimetal piece, for example by utilizing voltage divider or shunt, then bimetal piece can be done forr a short time and need not to cause so much thermal losses.
Description of drawings
Fig. 1 has shown the simplification view of demand limiter 10.
Embodiment
Demand limiter 10 comprises corresponding to the input A1 of each phase and output T1.Typically, demand limiter 10 comprises three such input A1, A2, A3 and three output T1, T2, T3.For the purpose of simplifying, corresponding to second and the element of third phase be omitted in the drawings.
Input A1 accepts the electric current of input, flows to fixedly contact element 12 by it along electric current track 11.If contact bridge 14 is suitably located, fixedly contact element 12 electrically contacts with movable contact element 13, and this movable contact element 13 is electrically connected with second movable contact element 15 by contact bridge 14 again.If contact bridge 14 still suitably the location, so second movable contact element 15 with second fixedly contact element 16 electrically contact.
Demand limiter 10 comprises electromagnetic drive unit 30, be suitable for responding at least one current phase that is loaded with super-high-current, by movable contact element 13,15 is removed the electric current that loads the restricting circuits from respective fixation contact element 12,16, i.e. electric current between input A1 and the output T1.
Electromagnetic drive unit 30 comprises yoke 22 and centers on the coil 21 of yoke 22.The electric current that enters electric current guide rail 17 via input A1 was conducted through the bimetal piece that comprises first leg 18 and second leg before it arrives coil 21 via metallic conductor 20.Electric current continues to flow to the tie point 24 that is positioned at before the output T1 from coil 21 via metallic conductor 23.
If the electric current in the coil 21 is too big, show and loaded excessive electric current in the circuit, then the magnetic field that is caused by coil 21 and yoke 22 makes armature 26A move down and promote plunger 26 to overcome the equilibrant force of biasing spring 25, make contact bridge 26 be pushed downwards, movable contact element 13,15 is moved apart fixedly contact element 12,16 and therefore open circuit.
In example as shown in the figure, the bimetal piece that comprises first supporting leg 18 and second supporting leg 19, preferably suitable for responding a kind of like this thermal expansion of at least one current phase that is loaded with super-high-current experience, make bimetal piece be suitable for after expansion preventing that movable contact element 13,15 from returning and contact with respective fixation contact element 12,16.
Bimetal piece can be suitable for having a kind of like this geometry after expansion, make its stop movable contact element 13,15 to return and contact with corresponding contact element 12,16.
Bimetal piece can be suitable for stoping the plunger 26 of mobile movable contact element 13,15 to turn back to movable contact element 13,15 and respective fixation contact element 12,16 contacted positions under its swelling state.
Bimetal piece can be suitable under its swelling state stoping electromagnetic drive unit 30 turn back to its detecting at least one current phase be loaded with super-high-current before position occupied.
Advantageously, bimetal piece adapted to before electromagnetic drive unit 30 moves movable contact element 13,15 and experiences thermal expansion.
Bimetal piece can be arranged between the coil 21 and second movable contact element 16.
Even the present invention is described by limiting examples, the technical staff should be appreciated that also the present invention can summarize within the scope of the appended claims.For example, bimetal piece can be or comprise spring band (snap strip) or spring dish (snap disc).
Claims (10)
1. a demand limiter (10), comprise electromagnetic drive unit (30), this electromagnetic drive unit is in order to respond the current phase that at least one is loaded with super-high-current, by making at least one movable contact element (13,15) from respective fixation contact element (12,16) remove the electric current that loads in the restricting circuits, described demand limiter (10) also comprises bimetal piece (18,19), being suitable for responding at least one is loaded with the current phase of super-high-current and experiences a kind of like this thermal expansion, make this bimetal piece (18,19) after expansion, be suitable for preventing described at least one movable contact element (13,15) return and with respective fixation contact element (12,16) contact, and described thermal expansion is by described bimetal piece (18,19) Ohmic resistance in causes.
2. demand limiter according to claim 1 (10), wherein, described bimetal piece (18,19) is suitable for having a kind of like this geometry after expanding, and makes its described at least one movable contact element of prevention (13,15) return and contacts with described respective fixation contact element (12,16).
3. demand limiter according to claim 1 and 2 (10), wherein, described bimetal piece (18,19) is suitable for stoping in order to the plunger (26) that moves described at least one movable contact element (13,15) under its swelling state and turns back to described at least one movable contact element (13,15) and the contacted position of described respective fixation contact element (12,16).
4. according to the described demand limiter of above-mentioned any one claim (10), wherein, described bimetal piece (18,19) be suitable for stoping described electromagnetic drive unit (30) to turn back under its swelling state detecting at least one current phase be loaded with super-high-current before its position occupied.
5. according to the described demand limiter of above-mentioned any one claim (10), wherein, described bimetal piece (18,19) is suitable for moving described at least one movable contact element (16) at described electromagnetic drive unit (30) and experiences thermal expansion before.
6. according to the described demand limiter of above-mentioned any one claim (10), wherein, described bimetal piece (18,19) is positioned between the coil (21) and described at least one movable contact element (16) of described electromagnetic drive unit (30).
7. according to the described demand limiter of above-mentioned any one claim (10), wherein, also comprise device (17) in order to the phase current of the described bimetal piece (18,19) that reduces to flow through.
8. according to the described demand limiter of above-mentioned any one claim (10), wherein, also comprise in order to reduce device (20,17) across the voltage of described bimetal piece (18,19).
9. according to the described demand limiter of above-mentioned any one claim (10), wherein, described bimetal piece (18,19) comprises the spring band.
10. according to the described demand limiter of above-mentioned any one claim (10), wherein, described bimetal piece (18,19) comprises the spring dish.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP06018302.7 | 2006-09-01 | ||
| EP06018302A EP1895562A1 (en) | 2006-09-01 | 2006-09-01 | A current limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101136293A true CN101136293A (en) | 2008-03-05 |
Family
ID=37649527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101409222A Pending CN101136293A (en) | 2006-09-01 | 2007-08-10 | A current limiter |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1895562A1 (en) |
| CN (1) | CN101136293A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102347174A (en) * | 2011-09-19 | 2012-02-08 | 广东天富电气集团有限公司 | Shunting method of circuit breaker |
| CN105070615A (en) * | 2015-07-11 | 2015-11-18 | 合肥正浩机械科技有限公司 | Electronic breaker double-breakpoint mechanism |
| CN110364402A (en) * | 2019-08-15 | 2019-10-22 | 刘晓丹 | A kind of quick response formula DC fuse |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE471947C (en) * | 1929-02-18 | Hugo Krieger Fa | Switching contact that locks itself in the switch-off position, especially for current limiters | |
| US2262344A (en) * | 1940-03-05 | 1941-11-11 | Penn Electric Switch Co | Circuit cutout |
| US5959517A (en) * | 1998-07-21 | 1999-09-28 | Eaton Corporation | Fault current tolerable contactor |
| US7138892B2 (en) * | 2004-09-30 | 2006-11-21 | Rockwell Automation Technologies, Inc. | Method and apparatus for soft-fault tolerant circuit interruption |
-
2006
- 2006-09-01 EP EP06018302A patent/EP1895562A1/en not_active Withdrawn
-
2007
- 2007-08-10 CN CNA2007101409222A patent/CN101136293A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102347174A (en) * | 2011-09-19 | 2012-02-08 | 广东天富电气集团有限公司 | Shunting method of circuit breaker |
| CN105070615A (en) * | 2015-07-11 | 2015-11-18 | 合肥正浩机械科技有限公司 | Electronic breaker double-breakpoint mechanism |
| CN110364402A (en) * | 2019-08-15 | 2019-10-22 | 刘晓丹 | A kind of quick response formula DC fuse |
| CN110364402B (en) * | 2019-08-15 | 2021-05-18 | 红光电气集团有限公司 | Quick response type direct current fuse |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1895562A1 (en) | 2008-03-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080305 |