CN102568959A - Switch, especially for low voltage circuit breaker - Google Patents
Switch, especially for low voltage circuit breaker Download PDFInfo
- Publication number
- CN102568959A CN102568959A CN2011103752497A CN201110375249A CN102568959A CN 102568959 A CN102568959 A CN 102568959A CN 2011103752497 A CN2011103752497 A CN 2011103752497A CN 201110375249 A CN201110375249 A CN 201110375249A CN 102568959 A CN102568959 A CN 102568959A
- Authority
- CN
- China
- Prior art keywords
- current
- winding
- switch
- electric current
- conductor
- 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
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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
- H01H71/24—Electromagnetic mechanisms
- H01H71/2454—Electromagnetic mechanisms characterised by the magnetic circuit or active magnetic elements
Abstract
The invention relates to a switch for interrupting current flowing across a conductor, especially for low voltage circuit breaker. The switch comprises prods which are mechanically disconnected from each other so as to disconnect the switch, a current sensor to detect current, a electronic trip unit, and a power source which supply the trip unit with operating current. The trip unit compares a detected current with a threshold value and triggers an opening of the switch when the detected current exceeds the threshold value. The power source includes a current transformer with an iron core having a winding. The winding is connected to the trip unit by lead lines and is laid in magnetic field of the conductor. In order to provide a current transformer by which the secondary loop current is still restricted even if the primary loop current is very large, the invention suggests that the winding and/or lead lines are at least partially formed from diamagnetic materials. By selecting diamagnetic materials and then laying the winding in the magnetic field of the conductor, the diamagnetic materials may increase electric resistance and accordingly, restrict the operating current when a large short-circuit current flowing through.
Description
Technical field
The present invention relates to a kind of switch, be particularly useful for the circuit breaker of low pressure.
Background technology
The circuit breaker that is used for low pressure is known and is used to the electric current of interrupt flow through conductor, and at this moment, the contact of adjacent laying is by separated from each other, and a contact is movable in the said contact, and that another contact is set as by cloth is fixing.In order automatically to trigger, assess by means of the current sensor senses electric current and by the electronics trigger element.Said trigger element compares detected electric current and predefined critical value, and trigger switch breaks off when exceeding this critical value.
Trigger element is connected with power supply, and said power supply is coupled out from conductor and is used for the operating current of trigger element.Adopt a kind of current transformer, its " elementary winding " is made up of conductor for this reason, and its secondary winding is winding and the iron core that is laid in the magnetic field of said conductor.Winding is connected with trigger element through the corresponding lead that connects.This instrument transformer unshakable in one's determination provided before iron core gets into magnetic saturation the proportional secondary loop of electric current (primary return electric current) electric current with the conductor of flowing through, and said secondary loop electric current is again for trigger element provides operating current, just to trigger element supply electric energy.At this, the secondary loop electric current should keep invariable as far as possible; But must under the situation of the bigger primary return electric current that is for example occurring under the short-circuit conditions, be limited at least.
Known from US5726846, in order to limit the secondary loop electric current, a kind of bypass that is connected in parallel with the magnetic major loop and has the constant width air gap is set, wherein also can make said air gap fill up nonmagnetic substance.When elementary loop current was big, said bypass was drawn through bypass a part of magnetic flux from secondary winding is other.Growth to the secondary loop electric current limits when the primary return electric current is big in this way.
Its shortcoming is, when adopting bypass and primary return electric current very big, still can occur the relatively large growth of secondary loop electric current all the time.
Summary of the invention
Technical problem to be solved by this invention is, a kind of current transformer is provided, even when the primary return electric current is very big, the secondary loop electric current of said current transformer still can be restricted.
Said technical problem is through a kind of switch that is used for interrupt flow through the electric current of conductor; The circuit breaker that is particularly useful for low pressure is able to solve, and said switch has in order to break off said switch contact separated from each other on mechanical realization and the current sensor that detects electric current and electronics trigger element and the power supply of supplying with the trigger element operating current, and said electronics trigger element compares detected electric current and critical value; And trigger switch breaks off when exceeding said critical value; Said power supply has and comprises winding and current transformer unshakable in one's determination, and said winding through connecting lead and be connected with trigger element and being laid in the magnetic field of conductor, is stipulated according to the present invention; Winding and/or its connect lead and are made up of diamagnetic material at least in part; Wherein, choose said diamagnetic material and it is laid in the magnetic field of conductor, promptly so like this; Make that when short circuit current flows through the resistance that diamagnetic material has increased can limit (and with this restraint of labour electric current) to the secondary loop electric current.In according to solution of the present invention, the Ohmic resistance of secondary winding because of rather than invariable, but depend on the magnetic flux in the iron core, thereby depend on the size of primary return electric current.This also is applicable to the connection lead, is in the magnetic field of conductor as long as these connect lead.
Thereby core of the present invention is, uses a kind of diamagnetic material that under the influence in magnetic field, can correspondingly change its Ohmic resistance at least simultaneously, comes the winding of Alloy instead of Copper wire producing secondary coil.
Under situation about being short-circuited, this electric current and and then operating current, the interior resistance through the current transformer secondary winding is confirmed fatefully.If secondary winding is owing to the violent magnetic flux density that increases increases its Ohmic resistance, so the maximum secondary loop current and and then operating current be limited in identical numerical value.If magnetic flux density reduces heavily again, so Ohmic resistance also reduce heavily not only and the secondary loop electric current heavily but also increase.
Embodiment
Next according to the circuit breaker that is used for low pressure, be called for short the embodiment of switch, the present invention is specified.Said switch is used to the electric current of interrupt flow through conductor, and it is controlled through switch.Switch is through being close to mutually of separated contact and closure in order to break off said switch.A contact is movable, and that another contact is set as by cloth is fixing, and the contact of wherein said activity is laid in the free end of contact brush.
Electric current detects by means of current sensor and is assessed by the electronics trigger element.Said trigger element compares said electric current and predefined critical value, and when exceeding this critical value, trigger switch breaks off.
Trigger element is realized electric current supply by means of current transformer, the said current transformer secondary loop electric current that from conductor, is coupled out.At this, the primary side that conductor plays current transformer is " elementary winding " perhaps, and winding constitutes its secondary winding or its primary side with unshakable in one's determination.Winding is wound up into iron core goes up and be laid in the magnetic field of the conductor of being flowed through by electric current, wherein said iron core is ringwise around conductor extension.Winding is connected with trigger element through the corresponding lead that connects.
For supplying electric current, the secondary loop electric current is loaded into predefined voltage with capacitor.As long as capacitor is loaded, " unnecessary " secondary loop electric current is just all the time by short circuit.
Through capacitor, the operating current for the trigger element power supply is provided.As long as condenser voltage has reduced some, capacitor is just by secondary loop electric current boost charge again (interrupting short circuit connects).
Winding and connection lead thereof are by bismuth (perhaps tungsten), and just a kind of diamagnetic material is formed.Another kind of known and suitable diamagnetic material is for example equally can adopted indium antimonide.
When short circuit current flows through, the resistance that diamagnetic material has increased will limit operating current, and this depends on the magnetic flux in the iron core, thereby depend on the size of primary return electric current.This also is applicable to the connection lead, is in the magnetic field of conductor as long as these connect lead.
Current transformer is designed to the current transformer of 25A, that is to say, when elementary loop current is 50A, because the cause of diamagnetic material can only motivate the secondary loop electric current that is 25A to the maximum through the electronic unit of trigger element.In the moment of short circuit, the secondary loop electric current is mainly confirmed through the interior resistance of instrument transformer winding.
Through optimizing; Just choose diamagnetic material; Characteristic curve (relation of Ohmic resistance and magnetic field intensity) and the current transformer of 25A are complementary; The electronic unit of the current transformer of said 25A will no longer bear the electric current greater than 25A, that is to say, the electronic unit of trigger element will no longer transship because of the volitional check in overcurrent zone.
Claims (1)
1. switch that is used for interrupt flow through the electric current of conductor is particularly useful for the circuit breaker of low pressure, has in order to break off said switch contact separated from each other on mechanical realization and the current sensor that detects electric current and electronics trigger element and the power supply of supplying with the trigger element operating current; Said electronics trigger element compares detected electric current and critical value; And trigger switch breaks off when exceeding said critical value, and said power supply has and comprises winding and current transformer unshakable in one's determination, with said winding through connecting lead and be connected and being laid in the magnetic field of conductor with trigger element; It is characterized in that; Winding and/or its connect lead and are made up of diamagnetic material at least partly, wherein, choose said diamagnetic material like this and it is laid in the magnetic field of conductor like this; Promptly; Make when sizable short circuit current flows through, the increase of diamagnetic material resistance, restraint of labour electric current correspondingly.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010061766.0 | 2010-11-23 | ||
| DE102010061766A DE102010061766A1 (en) | 2010-11-23 | 2010-11-23 | Switch i.e. low voltage circuit breaker, has power source including current transformer with iron core having winding formed from diamagnetic materials so that large short-circuit current flows through electrical resistor of winding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102568959A true CN102568959A (en) | 2012-07-11 |
Family
ID=45403066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103752497A Pending CN102568959A (en) | 2010-11-23 | 2011-11-23 | Switch, especially for low voltage circuit breaker |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102568959A (en) |
| DE (1) | DE102010061766A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852323A (en) * | 2014-02-14 | 2015-08-19 | 西门子公司 | Display unit and installation for distributing electrical energy with a corresponding display unit |
| CN110546731A (en) * | 2017-03-24 | 2019-12-06 | 西门子股份公司 | Circuit breaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3962661A (en) * | 1975-04-22 | 1976-06-08 | International Telephone And Telegraph Corporation | Magnetically shunted current transformer |
| CN1635642A (en) * | 2003-12-26 | 2005-07-06 | 北京云电英纳超导电缆有限公司 | Controllable resistor type superconducting fault current limiter |
| CN1658344A (en) * | 2005-03-10 | 2005-08-24 | 上海Mwb互感器有限公司 | Low-power electronic current mutual inductor |
| CN101114557A (en) * | 2007-08-30 | 2008-01-30 | 王有元 | Safety circuit breaker |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1563837B2 (en) * | 1966-12-27 | 1971-08-15 | Stotz Kontakt GmbH, 6800 Mannheim | MAGNETIC TRIGGER |
| FR2725320B1 (en) | 1994-09-29 | 1996-10-31 | Schneider Electric Sa | TRIGGERING DEVICE HAVING AT LEAST ONE CURRENT TRANSFORMER |
-
2010
- 2010-11-23 DE DE102010061766A patent/DE102010061766A1/en not_active Withdrawn
-
2011
- 2011-11-23 CN CN2011103752497A patent/CN102568959A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3962661A (en) * | 1975-04-22 | 1976-06-08 | International Telephone And Telegraph Corporation | Magnetically shunted current transformer |
| CN1635642A (en) * | 2003-12-26 | 2005-07-06 | 北京云电英纳超导电缆有限公司 | Controllable resistor type superconducting fault current limiter |
| CN1658344A (en) * | 2005-03-10 | 2005-08-24 | 上海Mwb互感器有限公司 | Low-power electronic current mutual inductor |
| CN101114557A (en) * | 2007-08-30 | 2008-01-30 | 王有元 | Safety circuit breaker |
Non-Patent Citations (1)
| Title |
|---|
| 耿文学: "《现代电工电子技术400问》", 31 December 2000, 中国建筑工业出版社 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852323A (en) * | 2014-02-14 | 2015-08-19 | 西门子公司 | Display unit and installation for distributing electrical energy with a corresponding display unit |
| US10319122B2 (en) | 2014-02-14 | 2019-06-11 | Siemens Aktiengesellschaft | Display unit and installation for distributing electrical energy with a corresponding display unit |
| CN104852323B (en) * | 2014-02-14 | 2021-11-16 | 西门子公司 | Display unit and device for distributing electrical energy having a corresponding display unit |
| CN110546731A (en) * | 2017-03-24 | 2019-12-06 | 西门子股份公司 | Circuit breaker |
| CN110546731B (en) * | 2017-03-24 | 2021-09-24 | 西门子股份公司 | Circuit breaker |
| US11676787B2 (en) | 2017-03-24 | 2023-06-13 | Siemens Aktiengesellschaft | Circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102010061766A1 (en) | 2012-01-19 |
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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 |
Application publication date: 20120711 |