CN101752146B - Method for improving stability of setting currents of electromagnetic trips of miniature circuit breaker - Google Patents
Method for improving stability of setting currents of electromagnetic trips of miniature circuit breaker Download PDFInfo
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- CN101752146B CN101752146B CN 200810180573 CN200810180573A CN101752146B CN 101752146 B CN101752146 B CN 101752146B CN 200810180573 CN200810180573 CN 200810180573 CN 200810180573 A CN200810180573 A CN 200810180573A CN 101752146 B CN101752146 B CN 101752146B
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- magnetictrip
- coil
- circuit breaker
- dropout
- exciting current
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Abstract
The invention provides a method for improving the stability of the setting currents of electromagnetic trips of a miniature circuit breaker, which includes the following steps: preparing a plurality of electromagnetic trips as for a predetermined circuit breaker; arranging the coils of the electromagnetic trips at different places; respectively measuring the tripping exciting currents of the electromagnetic trips; working out the relationship between the tripping exciting currents of the electromagnetic trips and the positions of the coils and thereby determining the sensitive areas of the coils to the exciting currents; and determining the mounting positions of the coils to avoid the sensitive areas.
Description
Technical field
The present invention relates to the miniature circuit breaker field, particularly relate to the method for the setting current stability of the magnetictrip that improves miniature circuit breaker.
Background technology
As shown in Figure 1, a miniature circuit breaker (MCB) 10 generally includes: handle and related operating mechanism 11 thereof; Magnetictrip 12; Arc control device 13; Moving contact 14; Decide contact 15; Binding post 16 and 17 etc.
The magnetictrip 12 of miniature circuit breaker (MCB) is moving protection component (short-circuit protection) of circuit breaker wink.Shown in Fig. 2 and 3, magnetictrip 12 comprises static iron core 26, moving iron core 21, yoke 25, coil 23, coil rack 24, magnetic red 22, push rod 27 etc.Square being directly proportional of the suction of electromagnet and exciting current, coil turn.Under the effect of electromagnet suction and magnetic red counter-force, iron core is moved under a certain exciting current.Moving iron core drives ram impacts dropout part, thereby promotes moving contact 14 disengagings and decide contacting of contact 15, and MCB is tripped under this electric current.This electric current is exactly the setting current of magnetictrip, is the important parameter of MCB, and clearly regulation is arranged in state compulsory standard.Every MCB can detect this parameter on production line.Detecting defective then this MCB scraps.
For the bigger MCB of rated current, the turn ratio of coil is less, often only needs several circles of coiling even a circle.In present magnetictrip design, do not realize coil position to the magnetictrip Effect on Performance, often coil is placed on the rightmost (away from one side of moving iron core) of yoke, as Fig. 1 and 2.In this magnetictrip, electromagnet suction is responsive to magnetictrip manufacturing and rigging error, causes the setting currents of electromagnetic trips instability.For example in the MCB of rated current 40A magnetictrip, the disqualification rate of MCB reaches 6%, has caused great waste.
Summary of the invention
The method that the purpose of this invention is to provide a kind of setting current stability of the magnetictrip that improves miniature circuit breaker, in order to make stability of setting currents of electromagnetic trips good, MCB magnetic is threaded off and is detected disqualification rate and reduce.
The invention provides a kind of method of setting current stability of the magnetictrip that improves miniature circuit breaker, described method comprises:
For the circuit breaker of predetermined dimension, prepare a plurality of magnetictrips;
Make the coil of described magnetictrip be positioned at different positions;
Measure these magnetictrip dropout exciting currents respectively;
Thereby the relation that draws the position of magnetictrip dropout exciting current and coil determines that exciting current is to the sensitizing range of coil position;
Determine that the installation site of described coil is to avoid described sensitizing range.
Preferably, described a plurality of magnetictrip uses identical magnetic red in measuring process.
Preferably, not enough one deck of the number of turn of coil.
The present invention also provides a kind of method of setting current stability of the magnetictrip that improves miniature circuit breaker, and it comprises:
For the circuit breaker of predetermined dimension, prepare a magnetictrip;
Change the position of the coil of magnetictrip, make coil be positioned at different positions and the magnetictrip dropout exciting current when measuring coil respectively and being positioned at diverse location;
Thereby the relation that draws the position of magnetictrip dropout exciting current and coil determines that exciting current is to the sensitizing range of coil position;
Determine that the installation site of described coil is to avoid described sensitizing range.
Preferably, not enough one deck of the number of turn of coil.
Circuit breaker for different size can use identical method to determine appropriate coil position, in order to improve the setting current stability of the magnetictrip of miniature circuit breaker.
The method of the setting current stability of the magnetictrip of raising miniature circuit breaker of the present invention, setting current stability can significantly be provided, make MCB magnetic thread off and detect the disqualification rate reduction, be specially adapted to the magnetictrip of the not enough one deck of all coils number of turn, be with a wide range of applications.
Description of drawings
Other advantage and characteristics will more clearly understand from the following explanation of the preferred embodiment of the present invention that provides as the indefiniteness example and show in the accompanying drawings, wherein:
Fig. 1 illustrates the general structural representation of miniature circuit breaker;
Fig. 2 has shown traditional magnetictrip schematic diagram;
Fig. 3 has shown the general structural representation of magnetictrip;
Fig. 4 has shown the schematic diagram of using the magnetictrip of the inventive method;
Fig. 5 has shown the schematic diagram of using another magnetictrip of the inventive method;
Fig. 6 has shown the schematic diagram of using another magnetictrip of the inventive method;
Fig. 7 has shown the not variation of electromagnetic trip multiple simultaneously of magnetictrip coil position.
Embodiment
The present invention is applied to the appropriate position of the coil of definite magnetictrip in the miniature circuit breaker in order to improve setting current stability.
As shown in Figure 3, such magnetictrip 12 can comprise: static iron core 26, moving iron core 21, yoke 25, coil 23, coil rack 24, magnetic red 22, push rod 27 etc.The structure of magnetictrip 12 and principle thereof are well known to a person skilled in the art, repeat no more.Main improvement of the present invention is to determine the appropriate position of coil of magnetictrip in order to avoid exciting current to the sensitizing range of coil position, thereby improves setting current stability.
The present invention realizes in the following way.
As shown in Figure 4, for the circuit breaker of certain specification, prepare some magnetictrips 30, make coil be positioned at different positions, namely the coil rightmost side is different values apart from the distance L of the right-hand member of yoke.
Measure these magnetictrip dropout exciting currents respectively.For fear of the error that different magnetic reds cause, when surveying these magnetictrip dropout exciting currents, preferably adorn same magnetic red or identical magnetic red.
Draw the then curve chart of relative position of exciting current and coil, as shown in Figure 7.This curve abscissa is the relative position of coil, ordinate be the magnetictrip dropout exciting current that measures to the multiple of rated current, be called for short magnetic dropout multiple.
Embodiment shown in Figure 7 is the measurement result of magnetictrip of the miniature circuit breaker of 40A for rated current.
Clearly as can be seen, coil position is during less than 1.3mm from this curve, and coil position has change slightly, and magnetic dropout multiple just has very big variation.The unsettled reason of traditional setting currents of electromagnetic trips that Here it is.Therefore, the zone during less than 1.3mm is defined as the sensitizing range of coil position with coil position.
According to this curve, we are designed to L=1.5mm to the relative position of coil, as shown in Figure 5.We also can be designed to L=2.5mm to the relative position of coil, as shown in Figure 6.Like this, magnetictrip is owing to make and rigging error when causing the shift in position of coil, and release dropout exciting current has only very little change.The magnetic dropout setting current of MCB just is not easy to run out of the scope of GB regulation.
The preferred positions that it is pointed out that coil is a scope, can select suitable coil position in the place that avoid the coil position sensitizing range in the production practices, for example the position of L=1.5mm shown in Figure 5 or L=2.5mm shown in Figure 6.But, consider make rigging error for example ± 1mm, all can drop in the preferable range greater than 1.3mm in order to guarantee the L value, we the nominal value L that got the position is 2.5mm in the present example.
Magnetictrip after the improvement, the suction of electromagnet is than big before improving, and is constant for the design load that guarantees magnetic dropout setting current, should suitably strengthen the active force of magnetic red.
Magnetictrip after evidence improves, electromagnet suction is responsive no longer so to the error of magnetictrip manufacturing and assembling, and the setting value stability of electric current is significantly improved than traditional magnetictrip.
For example, rated current is that the MCB of 40A has dropped to below 1% at the dropout of the magnetic on production line detection disqualification rate, has reduced the waste that substandard product causes greatly.
Obviously, electric release design improvement scheme of the present invention is applicable to be with a wide range of applications the magnetictrip of the not enough one deck of all coils number of turn.
Introduce another kind of embodiment of the present invention below.
Different with previous embodiment is that the method for the setting current stability of the magnetictrip of the raising miniature circuit breaker of present embodiment does not adopt a plurality of magnetictrips, but only prepares a magnetictrip; Change the position of the coil of this magnetictrip, make coil be positioned at different positions and the magnetictrip dropout exciting current when measuring coil respectively and being positioned at diverse location; Draw magnetictrip dropout exciting current thereby the relation of the position of the multiple of rated current and coil is determined that exciting current is to the sensitizing range of coil position; Determine that the installation site of described coil is to avoid described sensitizing range.
Circuit breaker for different size can use identical method to determine appropriate coil position, in order to improve the setting current stability of the magnetictrip of miniature circuit breaker.
Method of the present invention has been described above by reference to the accompanying drawings.Those skilled in the art can know that embodiments of the invention only are for example rather than limit.
Claims (5)
1. the method for the dropout exciting current stability of a magnetictrip that improves miniature circuit breaker, described method comprises:
For the circuit breaker of predetermined dimension, prepare a plurality of magnetictrips;
Make the coil of described magnetictrip be positioned at different positions;
Measure described magnetictrip dropout exciting current respectively;
Thereby the relation that draws the position of magnetictrip dropout exciting current and coil determines that exciting current is to the sensitizing range of coil position;
Determine that the installation site of described coil is to avoid described sensitizing range.
2. the method for the dropout exciting current stability of the magnetictrip of raising miniature circuit breaker as claimed in claim 1 is characterized in that,
Described a plurality of magnetictrip uses identical magnetic red in measuring process.
3. the method for the dropout exciting current stability of the magnetictrip of raising miniature circuit breaker as claimed in claim 1 is characterized in that,
The not enough one deck of the number of turn of described coil.
4. the method for the dropout exciting current stability of a magnetictrip that improves miniature circuit breaker, it comprises:
For the circuit breaker of predetermined dimension, prepare a magnetictrip;
Change the position of the coil of magnetictrip, make coil be positioned at different positions and the magnetictrip dropout exciting current when measuring coil respectively and being positioned at diverse location;
Thereby the relation that draws the position of magnetictrip dropout exciting current and coil determines that exciting current is to the sensitizing range of coil position;
Determine that the installation site of described coil is to avoid described sensitizing range.
5. the method for the dropout exciting current stability of the magnetictrip of raising miniature circuit breaker as claimed in claim 4 is characterized in that, the not enough one deck of the number of turn of described coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810180573 CN101752146B (en) | 2008-12-02 | 2008-12-02 | Method for improving stability of setting currents of electromagnetic trips of miniature circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810180573 CN101752146B (en) | 2008-12-02 | 2008-12-02 | Method for improving stability of setting currents of electromagnetic trips of miniature circuit breaker |
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| Publication Number | Publication Date |
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| CN101752146A CN101752146A (en) | 2010-06-23 |
| CN101752146B true CN101752146B (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200810180573 Active CN101752146B (en) | 2008-12-02 | 2008-12-02 | Method for improving stability of setting currents of electromagnetic trips of miniature circuit breaker |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103903924B (en) * | 2012-12-25 | 2016-05-11 | 施耐德电器工业公司 | Miniature circuit breaker |
| CN107833807B (en) * | 2017-11-21 | 2021-06-22 | 浙江正泰电器股份有限公司 | Electromagnetic trip device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1158487A (en) * | 1996-02-27 | 1997-09-03 | 淮南矿业学院 | Explosion-proof feeding switch over-current adjusting method and its device |
| CN1191020A (en) * | 1995-07-26 | 1998-08-19 | 西门子公司 | Functional test process for a mechanical switching element |
| EP1143471A2 (en) * | 2000-04-08 | 2001-10-10 | SHC Stangl & Henss Components GmbH | Electromechanical relay and adjusting method thereof |
| CN1645702A (en) * | 2004-01-22 | 2005-07-27 | 施耐德电器工业公司 | Differential protection device with simplified protection parameter adjustment means |
| CN1696712A (en) * | 2004-05-13 | 2005-11-16 | 施耐德电器工业公司 | Electric current measuring arrangement, current sensor, electric tripping device and circuit breaker using such a current measuring device |
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2008
- 2008-12-02 CN CN 200810180573 patent/CN101752146B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1191020A (en) * | 1995-07-26 | 1998-08-19 | 西门子公司 | Functional test process for a mechanical switching element |
| CN1158487A (en) * | 1996-02-27 | 1997-09-03 | 淮南矿业学院 | Explosion-proof feeding switch over-current adjusting method and its device |
| EP1143471A2 (en) * | 2000-04-08 | 2001-10-10 | SHC Stangl & Henss Components GmbH | Electromechanical relay and adjusting method thereof |
| CN1645702A (en) * | 2004-01-22 | 2005-07-27 | 施耐德电器工业公司 | Differential protection device with simplified protection parameter adjustment means |
| CN1696712A (en) * | 2004-05-13 | 2005-11-16 | 施耐德电器工业公司 | Electric current measuring arrangement, current sensor, electric tripping device and circuit breaker using such a current measuring device |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2005-209842A 2005.08.04 |
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