CN101908413A - Current transformer for supplying power for electronic device - Google Patents
Current transformer for supplying power for electronic device Download PDFInfo
- Publication number
- CN101908413A CN101908413A CN2010102374792A CN201010237479A CN101908413A CN 101908413 A CN101908413 A CN 101908413A CN 2010102374792 A CN2010102374792 A CN 2010102374792A CN 201010237479 A CN201010237479 A CN 201010237479A CN 101908413 A CN101908413 A CN 101908413A
- Authority
- CN
- China
- Prior art keywords
- iron circuit
- circuit
- gap
- iron
- current
- 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
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
- H01F3/12—Magnetic shunt paths
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Breakers (AREA)
Abstract
The invention relates to a current transformer for supplying power for an electronic device of a low voltage circuit breaker, which comprises a closed main magnetic circuit of a primary coil and a secondary coil. A second iron core magnetic circuit is mutually independent of the main magnetic circuit and is provided with a power supply secondary coil on one side close to the main magnetic circuit; a certain gap is reserved between the second iron core magnetic circuit and the main magnetic circuit; when current flowing through the power supply secondary coil exceeds the current required for normal operation of the electronic device, the thickness of the gap is diminished; and both ends of an opening of the second iron core magnetic circuit move dynamically towards the main magnetic circuit. Double magnetic circuits and a variable vertical gap are adopted; by reasonably adjusting a relationship between the attraction of the main magnetic circuit to the second iron core magnetic circuit and reaction force applied to the second iron core magnetic circuit, lower secondary current output with better performance can be obtained within the primary current range of normal width to abnormal width; and secondary current of stable output can be obtained especially when the primary current is larger than or equal to 0.3In.
Description
Technical field
The present invention relates to a kind of current transformer, more particularly, be related to the current transformer of electronic trip unit (ETU) the power supply usefulness of low-voltage circuit breaker to electronic installation power supply usefulness.
Background technology
The low-voltage circuit breaker of charged sub-trip gear; by main circuit current of current sensing means monitoring; produce and the corresponding signal of main circuit current size; exporting to the electronics trip gear samples; the electronics trip gear carries out computing according to signal magnitude; when exceeding the shutter limit value, send instruction and drive tripping mechanism, make circuit breaker disconnect a main circuit.
Electronic trip unit needs supply of electric power, if directly insert from an electrical network, then one is that electrical isolation can't be accomplished fine, in addition, when electrical network is short-circuited fault, supply voltage will significantly fall, and cause electronic trip unit operate as normal to move with carrying out to thread off.Therefore, common way is to adopt current transformer to draw energy from a major loop, electric energy comes from the electric current that flows through conductor, induced current in the Current Transformer Secondary coil is supplied to electronic trip unit work, and this electronic trip unit power consumption current transformer of circuit breaker of giving is also referred to as authigenic power supply.According to the standard-required of the GB/T22710-2008 low-voltage circuit breaker of implementing on October 1st, 2009 with electronic controller, controller has overload long delay, short circuit short time delay and the instantaneous three kinds of basic defencive functions of short circuit and some supplementary protection functions.This standard code controller comprise signal gathering unit (comprising current sensor), processing and performance element (comprising trigger element), and should have an authigenic power supply that produces by the protected circuit energy at least.Under no accessory power supply situation, low-voltage circuit breaker is generally worked by the current transformer primary side current energy of inducting with electronic controller.With regard to the basic defencive function of overload long delay of controller; its overload protection current value is adjustable; I is set to 0.4In; and earth fault protection is as the supplementary protection function; the minimum requirement of some situation is set to 0.2In; controller must can reliably protecting; therefore; the condition of work of at present a lot of design of Controller requires when primary current reaches 0.2In; controller must be worked reliably, and the design of power consumption current transformer must be satisfied the condition of work that controller is realized its basic defencive function and required supplementary protection function.Yet, be generally the current transformer of ribbon core as the current transformer of authigenic power supply.Within the specific limits, the input and output of iron core instrument transformer are linear substantially, its secondary current is that the variation with primary current changes, under the normal condition, after primary current reaches its starting current, the energy that current transformer is inducted at this moment is enough to keep the reliably working of controller, the power consumption that is controller is certain, when primary current increases again, will be to the energy that the current transformer of electronic trip unit power supply is responded to considerably beyond the required energy of electronic trip unit operate as normal, need unnecessary energy is consumed by other modes, especially under short-circuit conditions appears in main circuit, primary current is very big in the fluctuation of moment, and will guarantee the reliably working of electronic controller, but requires secondary current relatively stable with respect to big primary current scope energy.Therefore, when the output of the secondary of current transformer satisfy controller work required after, how obtaining an alap secondary current output at one in from normality to abnormal wide primary current scope, is the insoluble problem of attending to one thing and lose sight of another that this current transformer design faces.
Current, the most frequently used power consumption current transformer scheme has two kinds: a kind of is the iron core magnet loop that the iron core silicon steel sheet that punching out is good is folded a sealing of thick one-tenth, and magnetic resistance is very little, and wherein core section wants little base pass the power supply secondary coil relatively.During its punching conductor dbus overcurrent, the magnetic flux in iron core, the set up overwhelming majority can by the power supply secondary coil around iron core.When primary current is big, needs extra increase energy-dissipating device, thereby cause small product size big, production cost increases.
Another kind be the power supply secondary coil around that iron leg core one side iron core in parallel again prop up magnetic circuit, by parallel branch main magnetic circuit is divided into two parallel branch magnetic circuits, then must there be the part magnetic flux can flow through a magnetic circuit, thereby reduced the magnetic flux that flows through power supply secondary coil institute wound core, promptly reduced the output of power supply secondary coil.A kind of authigenic power supply of such magnetic Circuit Design that adopted is for example disclosed by U.S. Pat 5726846 and US7145421, therefore needn't additionally increase energy-dissipating device again.Though second iron circuit of above-mentioned two kinds of existing forms can divide the magnetic flux in part first iron circuit that flows away when electrorheological is big, but because a magnetic circuit has the fixed interval (FI) of constant width, the output of power supply secondary coil still can increase by a fairly big margin with the electric current increase of flowing through in the punching conductor, can't continue the magnetic flux of first iron circuit to increase and make dynamic response, secondary current be still very big with the fluctuation that primary current increases.
In order under the situation of short circuit, to make a magnetic circuit reach magnetic saturation with secondary coil, reduce the fluctuation that changes with primary current from the secondary current of secondary coil outflow simultaneously, Chinese patent application CN101685725A discloses and has a kind ofly changed with primary current its magnetic circuit of variation greater than rated current by the gap, so that the magnetic resistance that occurs in the magnetic circuit in parallel diminishes automatically and limits the scheme of secondary coil output.But because described gap is parallel to magnetic circuit, it is very big to cause driving the required magnetic force of gap smaller, so can only be under the situation of primary current greater than the rated current of described circuit breaker, particularly under situation about being short-circuited, described additional magnetic resistance (gap) all just changes under greater than the situation of described circuit breaker rated current in primary current, and be less than or equal at primary current under the situation of amount electric current, this gap can not diminish, parallel branch does not produce any effect, thereby the current transformer of employing CN101685725A, the secondary current of its output enters the pairing primary current of metastable state at least greater than rated current 1In, this scheme can only be used under the situation of primary current greater than the rated current of circuit breaker, not only can not play the effect of the alap secondary current of output that guarantees that described controller reliably working is required, and not meet the needs of producing actual and market.And, because being overlapped mutually by ligule free end in flakes, the parallel branch of this authigenic power supply forms, the gap is arranged on adjacent two that constitute magnetic circuit, down stacked magnetic ligule sheet type in flakes between, like this ligule of each side of both sides, gap in flakes the sectional area of cross section can not surpass half of sectional area of main magnetic circuit cross section at most, this makes this parallel branch can only divide to walk at most in the main magnetic circuit less than the magnetic flux of half, makes this prior art want that reducing the technique effect that magnetic resistance in the parallel branch solves energy consumption issues under the big current conditions by gap smaller is restricted.Moreover, the branch road that is same as secondary coil that imposes a condition of the primary current that this prior art is required with gap smaller reaches imposing a condition of the required primary current of magnetic saturation, imposing a condition of the two all is greater than rated current, as seen, the course of action of gap smaller is that the branch road that occurs in secondary coil has been under the magnetically saturated state, and the actual effect of such magnetic shunt structure is unsatisfactory.In addition, because in the middle of its gap magnetic circuit is positioned at, have overlappingly, disturb, influence current detection accuracy so the leakage field of gap magnetic circuit will produce the hollow coil signal with the hollow coil that is used to detect electric current around electrical conductor.
Therefore, at present can reliable operation for the electronic trip unit that guarantees low-voltage circuit breaker, people press for a kind of new-type authigenic power supply, make electronic trip unit not only can normally start work under far below the situation of rated current In at primary current, and also can operate as normal when primary current surpasses rated current In.
Summary of the invention
The objective of the invention is to overcome above-mentioned many defectives of prior art, provide a kind of to electronic installation power consumption current transformer, when startup working point that the primary current that passes instrument transformer requires greater than the electronic controller of circuit breaker, second iron circuit can increase the first iron circuit magnetic field makes dynamic response, thereby at primary current far below rated current In with surpass under the situation of rated current In, the secondary curve of output that can both more be better than above-mentioned each prior art, the electronic trip unit that guarantees low-voltage circuit breaker can reliable operation, reach the purpose of mild power supply secondary coil electric current curve of output, and need not to add again energy-dissipating device.
The electronic installation power consumption current transformer of giving of the present invention comprises:
One is assemblied in power supply secondary coil 31 on first iron circuit, 11 1 sides around independently first iron circuit 11 with closed ring of a punching conductor 21 and at least one, described power consumption current transformer also comprises second iron circuit 41 of an independently opening that separates with described first iron circuit 11, described second iron circuit 41 is near the side that power supply secondary coil 31 is housed on first iron circuit 11, and and be provided with the gap between first iron circuit 11, when the electric current that flows through power supply secondary coil 31 surpasses the required current value of described electronic installation operate as normal, describedly remain on two and separate magnetic circuits 11, the less thick in the gap between 41 makes the two ends of the opening of second iron circuit 41 dynamically move towards first iron circuit 11.
The two ends of the opening of described second iron circuit 41 are positioned at outside first iron circuit 11, and are positioned at the both sides of described power supply secondary coil 31, have first gap 1 and second gap 2 between the two ends of described opening and first iron circuit 11 respectively.Described first gap 1 and second gap 2 are respectively perpendicular to first iron circuit 11 and/or second iron circuit 41.Described first gap 1 is identical with the thickness in second gap 2, is respectively 1-10mm.
Have flexible member 51 on described second iron circuit 41, the actuating force that changes the thickness in described gap is provided by the magnetic force in this flexible member 51 and first iron circuit 11.
The sectional area of the cross section of second iron circuit 41 is more than or equal to the sectional area of the cross section of first iron circuit 11.
Described instrument transformer is located and encapsulation with plastic casing.
Current sensor 81 is arranged on first iron circuit 11 around a punching conductor 21, is used for detecting the size of current that flows through from punching conductor 21.
The iron core inside casing height of second iron circuit 41 is higher than height 1～2mm that power supply secondary coil 31 exposes.
Power consumption current transformer of the present invention can make electronic trip unit obtain lower startup working point, and under the situation of no accessory power supply, when all phase currents of main circuit were not less than 0.4In, controller can reliably working, and can realize basic defencive function.And, also can operate as normal when primary current surpasses rated current In.All be positioned in the middle of the main magnetic circuit differently with the gap magnetic circuit of prior art, gap of the present invention magnetic circuit is positioned at main magnetic circuit one side, and main magnetic circuit length is significantly shorter than prior art, magnetic circuit is short more, magnetic resistance is more little, and under the little situation of primary current, the present invention has better power supply fan-out capability.And because gap of the present invention magnetic circuit is positioned at power supply secondary coil one side, can not produce harmful effect, improve the overall performance of current transformer power supply output the precision of hollow coil.The electronic installation power consumption current transformer of giving of the present invention is verified its principle by electromagnetic-field simulation by institute's established model, and simulation result shows: when between first, second iron circuit during the about 5mm in gap, output does not have to the power supply secondary coil influences; When the gap became 0.5mm between first, second iron circuit, power supply secondary coil power output reduced about 1/3rd.
Description of drawings
Fig. 1: the simplification magnetic structure schematic diagram of giving electronic installation power consumption current transformer of the present invention.
Fig. 2 A, Fig. 2 B, Fig. 2 C: current transformer shown in Figure 2 Distribution of Magnetic Field schematic diagram under different gap.Fig. 2 A is depicted as when flowing through electric current in the punching conductor when very little, and Fig. 2 B is depicted as when flowing through electric current in the punching conductor and increase, and Fig. 2 C is depicted as when flowing through electric current in the punching conductor when very big.
Fig. 3: first execution mode of giving electronic installation power consumption current transformer main magnetic circuit and dividing magnetic circuit of the present invention.
Fig. 4: another interchangeable by way of example of giving electronic installation power consumption current transformer main magnetic circuit and dividing magnetic circuit of the present invention.
Fig. 5: the curve chart of the secondary current of electronic installation power consumption current transformer of giving of the present invention with the primary current variation.
Embodiment
According to following to only provide as non-limitative example and in conjunction with the accompanying drawings shown in the description of the specific embodiment of the present invention, the present invention will become clear more with respect to the exclusive characteristic of prior art and advantage and be easier to understand.
Fig. 1 is that the electronic installation power consumption current transformer of giving of the present invention is simplified the inside magnetic path structure schematic diagram.The invention provides and a kind ofly can make dynamic response to the primary side current size, guarantee the iron circuit of the stable output of power supply secondary coil, it independently separates iron circuit by two shown in Figure 1 and forms.The core design of first iron circuit 11 becomes to center on the close-shaped of punching conductor 21 sealings, respectively that " U " shape and " one " font silicon steel sheet is folded thick earlier, to fold thick silicon steel sheet by riveted joint or welding then and be tightened to holistic iron core, wherein " one " font silicon steel passes after the power supply secondary coil 31 that winds, assemble and be welded into the iron circuit of sealing with " U " shape silicon steel, constitute first iron circuit 11, the i.e. main magnetic circuit.Power supply secondary coil 31 is fixed in a side of first iron circuit 11.Second iron circuit, 41 close main magnetic circuits are equipped with a side of power supply secondary coil 31, and and 41 maintenances of first iron circuit certain clearance.The core section of second iron circuit 41 is greater than the core section of first iron circuit 11, to reduce magnetic resistance.Two are separated magnetic circuit, and the gap between first iron circuit 11 and second iron circuit 41 is dynamic change, and promptly the magnetic resistance of main magnetic circuit and branch's magnetic circuit is dynamic change.
Transformer iron core and coil encapsulate and locate with plastic casing.
In a punching conductor 21, flow through alternating current, will in first iron circuit 11, produce closed magnetic field, be assemblied in the power supply secondary coil 31 cutting alternating magnetic fields on first iron circuit, 11 1 ends, the energy of inducting output.Before magnetic field was not set up, second iron circuit 41 and first iron circuit, 11 gaps were fixed, when the first iron circuit changes of magnetic field, and the gap dynamic change between second iron circuit and first iron circuit.
Fig. 2 is the Distribution of Magnetic Field schematic diagram of current transformer under different gap.Fig. 2 A is depicted as when flowing through electric current in the punching conductor when very little, and magnetic flux mainly flows in first magnetic field.Fig. 2 B is depicted as when flowing through the electric current increase in the punching conductor, and the corresponding increase in the first iron circuit magnetic field produces certain suction to second iron circuit, and the gap between two magnetic circuits is reduced, and two magnetic circuits trend is approaching, and the part magnetic flux flow is crossed second iron circuit.Fig. 2 C is depicted as when flowing through electric current in the punching conductor when very big, and the gap is littler between first iron circuit and second iron circuit, and more magnetic flux flows are crossed second iron circuit.
Fig. 3 is first execution mode of giving the inner magnetic circuit of electronic installation power consumption current transformer of the present invention.One is assemblied in power supply secondary coil 31 on first iron circuit 11 around independently first iron circuit 11 with closed ring of a punching conductor 21 and at least one, and power supply secondary coil 31 is fixed in a side of first iron circuit 11.In the embodiment shown in fig. 3, label 12 is good " U " shape iron core of punching out, and 13 is " one " word iron core, and power supply secondary coil 31 is assemblied on " one " word iron core 13, and 32 is coil rack, and 33 for being around in the lacquer tailors tack bag on the skeleton 32.Respectively " U " shape, " one " word punching lamination are riveted tightly or firm welding after, assemble coil 31, again both are assembled into close-shaped around a punching conductor, the seam crossing firm welding forms independently first iron circuit 11.
As shown in Figure 3, second iron circuit 41 of also comprising an independently opening that separates with first iron circuit 11 for electronic installation power consumption current transformer of the present invention, second iron circuit 41 is the good weak point of a punching out " U " shape iron core, be positioned at " one " word silicon steel one side of first iron circuit 11, it is near the side that power supply secondary coil 31 is housed on first iron circuit 11, the two ends of its opening are positioned at the both sides of described power supply secondary coil 31, and and first iron circuit 11 between maintain the gap.The sectional area of the cross section of second iron circuit 41 is greater than the sectional area of the cross section of first iron circuit 11.Described second iron circuit 41 is provided with like this, second iron circuit 41 connects by the flexible member 51 and first iron circuit 11, and and leave the gap of certain distance between " one " word silicon steel of first iron circuit 11, the gap that is had between the two ends of described opening and first iron circuit 11 is respectively first gap 1 and second gap 2.They are respectively perpendicular to first iron circuit 11 and/or second iron circuit 41, and first gap 1 is identical with the thickness in second gap 2.Along with the first iron circuit changes of magnetic field, and the gap between first iron circuit can dynamic change.The gap that keeps 1～10mm between two magnetic circuits can be according to the specific design adjustment.In first embodiment shown in Figure 3, flexible member is extension spring, and the center punching of second iron circuit 41 can be dashed a little hook in advance, is used for fixing an end of flexible member 51, and the other end of extension spring is fixed on the hook of top, the second iron circuit center.Specifically, one end of extension spring is fixed on the center inner wall hook at transformer casing 61 tops, it relies on plastic casing 61 to carry out assembling and positioning, and the other end of flexible member 51 is fixed in the middle of second iron circuit, and it is spacing that the second iron circuit movement locus relies on the shell fluting.Described instrument transformer is located and encapsulation with plastic casing.
The iron core inside casing height of second iron circuit 41 highly is advisable to be higher than coil 31, described height will be higher than height 1～2mm that power supply secondary coil 31 exposes, this is to increase when primary current in order to prevent, when first iron circuit 11 was inhaled second iron circuit 41, second iron circuit 41 was unlikely to be powered secondary coil 31 towards first iron circuit 11 mobile and blocks.
The electronic installation power consumption current transformer of giving of the present invention also comprises: current sensor 81 is arranged on the iron core top of first iron circuit 11 around punching conductor 21, is used for detecting the size of current that flows through from punching conductor 21.Described current sensor 81 is hollow coils, be fixed on " U " shape iron core upper surface of first iron circuit 11, and constitute close-shaped around the first punching conductor 21, and not overlapping with power supply secondary coil 31, avoided current sensor 81 mutual interference mutually to take place between the two with power supply secondary coil 31.Two coils 81 and 31 signal output lead adopt Shielded Twisted Pair, go out wire casing along plastic casing inwall opposite side respectively and lead on the junction block.
The following describes operation principle of giving electronic installation power consumption current transformer of the present invention.When the electric current that flows through power supply secondary coil 31 surpasses the required electric current I o1 of described electronic installation operate as normal, along with primary side current increases, first core field is also more and more stronger, to produce certain suction to second iron circuit, suction overcomes the resistance of flexible member 51, the distance in second iron circuit 41 and 11 gaps of first iron circuit is reduced, separate magnetic circuit 11 along with remaining on two, the less thick in the gap between 41 can dynamically move the two ends of the opening of second iron circuit 41 towards first iron circuit 11.Have flexible member 51 on second iron circuit 41, the actuating force that changes the thickness in described gap is provided by the magnetic force in this flexible member 51 and first iron circuit 11.Some magnetic line of force will form and divide magnetic circuit by second iron circuit this moment.Both gaps are more little, and magnetic resistance reduces, and the magnetic flux that flows through second iron circuit is many more, and the magnetic flux that flows through in the feasible power supply secondary coil 31 remains unchanged substantially, has guaranteed the stable of its output.
Fig. 4 is another execution mode of giving the inner magnetic circuit of electronic installation power consumption current transformer of the present invention.Among the embodiment shown in Figure 4, flexible member 51 is arranged at respectively in the middle of the interval of first iron circuit 11 and second iron circuit 41.Flexible member is spring or rubber sheet gasket, is packaged in the rubber sleeve, on " U " shape arm of second iron circuit of again the rubber sleeve cover being packed into.
The installing and locating of iron core is identical with execution mode shown in Figure 3, also realizes by means of transformer casing.The sectional area of the cross section of second iron circuit 41 is more than or equal to the sectional area of the cross section of first iron circuit 11.Different with the embodiment of Fig. 3 is that the thickness in first gap 1 and second gap 2 can have difference.Along with the first iron circuit changes of magnetic field, and the gap between first iron circuit can dynamic change.The gap that keeps 1～10mm between two magnetic circuits can be according to the specific design adjustment.。
Fig. 5 is the curve chart of the secondary current of electronic installation power consumption current transformer with the primary current variation of giving of the present invention.I1 represents primary current among the figure, and I2 represents the secondary coil output current, and Io1 represents the electronic trip unit operating current.As shown in Figure 5, when primary current in rated current, mean that this moment, main magnetic circuit relatively once wanted weak a lot of during big electric current to the suction of second iron circuit, operating characteristic and condition of work according to breaker controller, the normal controller working point is monophase current instrument transformer power supply 0.3In, the electronic installation power consumption current transformer of giving of the present invention is by cutting down extension spring power (first embodiment), or spring/elastic caoutchouc counter-force (second embodiment) makes: main magnetic circuit only needs less suction just can make that the gap changes under the situation of the startup working point that primary current requires greater than controller to second iron circuit, so only need reasonably to adjust main magnetic circuit to the suction of second iron circuit and the relation of the counter-force that second iron circuit is applied, variation by the gap magnetic circuit, come (promptly to refer to nominal load or underloading) under the limiting circuit breaker normality condition of work and big current conditions under secondary coil output, thereby obtain as shown in Figure 5 gratifying secondary curve of output.As seen, because the present invention's second iron circuit 41 can be made dynamic response to the primary side current size, thereby make the output of power supply secondary coil 31 can keep well stable, guarantee the best operating condition of the electronic trip unit of load-side low-voltage circuit breaker, improved the reliability and stability of its work greatly.And in the iron circuit of two separation, the gap magnetic circuit is positioned at power supply secondary coil 31 1 sides of main magnetic circuit, is used to detect the hollow coil 81 and gap magnetic circuit zero lap of electric current, can not have influence on the precision of this hollow coil.
Following is the data that the preliminary test that the simple model of making according to embodiment of the present invention carries out is obtained:
Above test data shows that as when primary current is very little, first, second iron circuit gap is constant, and then secondary power supply coil obtains bigger output, has guaranteed the low start-up point of electronic trip unit.As increasing when primary current, second iron circuit is produced big suction, make first, second iron circuit gap smaller, the corresponding increase of second iron circuit shunting magnetic flux, secondary power supply coil curve of output is mild, greatly reduce load power consumption, provide reliable guarantee the operate as normal of electronic trip unit.
What should be understood that is, the foregoing description is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed in the connotation scope of the present invention all fall within protection scope of the present invention.
Claims (10)
1. give electronic installation power consumption current transformer for one kind, comprise that one is assemblied in power supply secondary coil (31) on first iron circuit (11) one sides around independently first iron circuit (11) with closed ring of a punching conductor (21) and at least one, is characterized in that:
Second iron circuit (41) that also comprises an independently opening that separates with described first iron circuit (11), described second iron circuit (41) is near the side that power supply secondary coil (31) is housed on first iron circuit (11), and and be provided with the gap between first iron circuit (11), when the electric current that flows through power supply secondary coil (31) surpasses the required current value of described electronic installation operate as normal, describedly remain on two and separate magnetic circuits (11, the less thick in the gap 41) makes the two ends of the opening of second iron circuit (41) dynamically move towards first iron circuit (11).
2. the electronic installation power consumption current transformer of giving according to claim 1, it is characterized in that, the two ends of the opening of described second iron circuit (41) are positioned at outside first iron circuit (11), and be positioned at the both sides of described power supply secondary coil (31), have first gap (1) and second gap (2) between the two ends of described opening and first iron circuit (11) respectively.
3. the electronic installation power consumption current transformer of giving according to claim 1, it is characterized in that, have flexible member (51) on described second iron circuit (41), the actuating force that changes the thickness in described gap is provided by the magnetic force in this flexible member (51) and first iron circuit (11).
4. the electronic installation power consumption current transformer of giving according to claim 2 is characterized in that described first gap (1) and second gap (2) are respectively perpendicular to first iron circuit (11) and/or second iron circuit (41).
5. the electronic installation power consumption current transformer of giving according to claim 1 is characterized in that the sectional area of the cross section of second iron circuit (41) is more than or equal to the sectional area of the cross section of first iron circuit (11).
6. the electronic installation power consumption current transformer of giving according to claim 2 is characterized in that described first gap (1) is identical with the thickness of second gap (2).
7. the electronic installation power consumption current transformer of giving according to claim 2 is characterized in that the thickness of described first gap (1) and second gap (2) is respectively 1-10mm.
8. the electronic installation power consumption current transformer of giving according to claim 1 is characterized in that described instrument transformer is located and encapsulation with plastic casing.
9. the electronic installation power consumption current transformer of giving according to claim 1, it is characterized in that, a current sensor (81) is arranged on first iron circuit (11) around a punching conductor (21), is used for detecting the size of current that flows through from a punching conductor (21).
10. the electronic installation power consumption current transformer of giving according to claim 1 is characterized in that the iron core inside casing height of described second iron circuit (41) is higher than height 1～2mm that power supply secondary coil (31) exposes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010237479A CN101908413B (en) | 2010-07-27 | 2010-07-27 | Current transformer for supplying power for electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010237479A CN101908413B (en) | 2010-07-27 | 2010-07-27 | Current transformer for supplying power for electronic device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101908413A true CN101908413A (en) | 2010-12-08 |
| CN101908413B CN101908413B (en) | 2012-10-03 |
Family
ID=43263843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010237479A Active CN101908413B (en) | 2010-07-27 | 2010-07-27 | Current transformer for supplying power for electronic device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101908413B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136358A (en) * | 2011-01-13 | 2011-07-27 | 上海诺雅克电气有限公司 | Power supply current transformer for electronic protection |
| CN102866282A (en) * | 2012-09-11 | 2013-01-09 | 中国科学院等离子体物理研究所 | Zero-flux hall large-current sensor structure |
| CN103630724A (en) * | 2013-06-26 | 2014-03-12 | 浙江天际互感器有限公司 | Self-calibration harmonic current transformer based on gapped iron core coil |
| CN105336484A (en) * | 2014-08-06 | 2016-02-17 | 上海电科电器科技有限公司 | Current transformer |
| CN112997264A (en) * | 2018-12-26 | 2021-06-18 | Ls电气株式会社 | Current transformer of air circuit breaker |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5726846A (en) * | 1994-09-29 | 1998-03-10 | Schneider Electric Sa | Trip device comprising at least one current transformer |
| US7145421B2 (en) * | 2003-12-30 | 2006-12-05 | Abb Service S.R.L. | Device for supplying an electronic protection device to be used in a low-voltage circuit breaker |
| WO2009103102A1 (en) * | 2008-02-22 | 2009-08-27 | Egston System Electronics Eggenburg Gmbh | Converter arrangement |
| CN201498321U (en) * | 2009-06-25 | 2010-06-02 | 清流县鑫磁线圈制品有限公司 | U1 type combined magnetic core with finely adjustable air gap |
| CN201845653U (en) * | 2010-07-27 | 2011-05-25 | 上海诺雅克电气有限公司 | Current transformer for supplying power for electronic device |
-
2010
- 2010-07-27 CN CN201010237479A patent/CN101908413B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5726846A (en) * | 1994-09-29 | 1998-03-10 | Schneider Electric Sa | Trip device comprising at least one current transformer |
| US7145421B2 (en) * | 2003-12-30 | 2006-12-05 | Abb Service S.R.L. | Device for supplying an electronic protection device to be used in a low-voltage circuit breaker |
| WO2009103102A1 (en) * | 2008-02-22 | 2009-08-27 | Egston System Electronics Eggenburg Gmbh | Converter arrangement |
| CN201498321U (en) * | 2009-06-25 | 2010-06-02 | 清流县鑫磁线圈制品有限公司 | U1 type combined magnetic core with finely adjustable air gap |
| CN201845653U (en) * | 2010-07-27 | 2011-05-25 | 上海诺雅克电气有限公司 | Current transformer for supplying power for electronic device |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136358A (en) * | 2011-01-13 | 2011-07-27 | 上海诺雅克电气有限公司 | Power supply current transformer for electronic protection |
| WO2012094903A1 (en) * | 2011-01-13 | 2012-07-19 | 上海诺雅克电气有限公司 | Supply current transformer for electronic protection |
| US8723630B2 (en) | 2011-01-13 | 2014-05-13 | Noark Electric (Shanghai) Co. Ltd. | Current transformer for supplying power to electronic controller |
| EP2665071A4 (en) * | 2011-01-13 | 2017-10-18 | Noark Electrics (Shanghai) Co., Ltd. | Supply current transformer for electronic protection |
| CN102866282A (en) * | 2012-09-11 | 2013-01-09 | 中国科学院等离子体物理研究所 | Zero-flux hall large-current sensor structure |
| CN102866282B (en) * | 2012-09-11 | 2014-11-26 | 中国科学院等离子体物理研究所 | Zero-flux hall large-current sensor structure |
| CN103630724A (en) * | 2013-06-26 | 2014-03-12 | 浙江天际互感器有限公司 | Self-calibration harmonic current transformer based on gapped iron core coil |
| CN103630724B (en) * | 2013-06-26 | 2015-10-21 | 浙江天际互感器有限公司 | Based on the self calibration harmonic current mutual inductor of band gap iron-core coil |
| CN105336484A (en) * | 2014-08-06 | 2016-02-17 | 上海电科电器科技有限公司 | Current transformer |
| CN105336484B (en) * | 2014-08-06 | 2018-05-01 | 上海电科电器科技有限公司 | Current transformer |
| US10340079B2 (en) | 2014-08-06 | 2019-07-02 | Seari Electric Technology Co., Ltd. | Current transformer |
| CN112997264A (en) * | 2018-12-26 | 2021-06-18 | Ls电气株式会社 | Current transformer of air circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101908413B (en) | 2012-10-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101908413B (en) | Current transformer for supplying power for electronic device | |
| US5615075A (en) | AC/DC current sensor for a circuit breaker | |
| EP1946339B1 (en) | A current transformer including a low permeability shunt and a trip device employing the same | |
| CN106706999A (en) | Thyristor contactor current detection device | |
| EP3484035A1 (en) | Hysteresis power supply circuit | |
| US9103852B2 (en) | Direct current sensing circuit and circuit interrupter including the same | |
| EP2665071A1 (en) | Supply current transformer for electronic protection | |
| CN201845653U (en) | Current transformer for supplying power for electronic device | |
| CN201163717Y (en) | Intelligent household leakage protector | |
| CN106783436A (en) | A kind of mini-type residual current actuated breaker | |
| CN206742180U (en) | A kind of mini-type residual current actuated breaker | |
| CN218272608U (en) | Measuring and protecting device for electric switch and electric switch | |
| CN205016477U (en) | Bayonet miniature circuit breaker casing mounting structure | |
| CN203931974U (en) | The magnetictrip of circuit breaker | |
| EP2909854B1 (en) | Electrical switching apparatus including transductor circuit and alternating current electronic trip circuit | |
| CN1159065A (en) | Circuit breaker | |
| CN209150031U (en) | A kind of breaker leakage protection structure | |
| CN209542689U (en) | Hall current sensor with current-limiting protection function | |
| KR102145826B1 (en) | Leakage current detection sensitivity adjustable zct | |
| CN209282018U (en) | Current transformer based on large span no-load voltage ratio | |
| CN102354943A (en) | Work method of electronic release | |
| CN203931968U (en) | The shunting syndeton of zero sequence current mutual inductor in residual current circuit breaker | |
| CN208190241U (en) | A kind of security system based on leakage current sensor | |
| CN201975250U (en) | Power supply current transformer for electronic protection | |
| JP5433480B2 (en) | Electronic circuit breaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20101208 Assignee: ZHEJIANG CHINT ELECTRICS Co.,Ltd. Assignor: SHANGHAI NOARK ELECTRIC Co.,Ltd. Contract record no.: X2021330000593 Denomination of invention: Current transformer for supplying power to electronic devices Granted publication date: 20121003 License type: Common License Record date: 20211025 |