CN203179689U - Current mutual inductor - Google Patents
Current mutual inductor Download PDFInfo
- Publication number
- CN203179689U CN203179689U CN 201320069478 CN201320069478U CN203179689U CN 203179689 U CN203179689 U CN 203179689U CN 201320069478 CN201320069478 CN 201320069478 CN 201320069478 U CN201320069478 U CN 201320069478U CN 203179689 U CN203179689 U CN 203179689U
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- iron core
- closed
- current
- grooves
- current transformer
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Abstract
The utility model provides a current mutual inductor. The current mutual inductor comprises an annular closed iron core connected with a primary circuit in a coupling mode, and a secondary coil wound on the closed iron core, wherein the closed iron core can be a laminated iron core, two grooves are formed in the symmetrical positions on the periphery of the circumference of the closed iron core, and the grooves are formed and can enable the magnetic circuit sectional area of the iron core at the position to be smaller than the average magnetic circuit sectional area of the closed iron core. By the adoption of the current mutual inductor, when the primary side current is small, the grooves do not have effects, the mutual inductor generates a small current in an induction mode in the secondary coil through electromagnetic induction and normally supplies power to electronic parts connected to the secondary coil, and when the primary side current is large, saturation-resistant capacity of the iron core is improved, therefore, the iron core can work in a larger current range, and meanwhile, electric power supply which is longer in time and more stable can be provided for loads.
Description
Technical field
The utility model relates to a kind of current transformer, relates in particular to a kind of current transformer that energy is provided for electronic unit.
Background technology
Current transformer is the parts that carry out current conversion according to electromagnetic induction principle, is widely used in the electric power system.Current transformer is made up of iron core-closed and winding usually, and winding comprises first side winding and secondary side winding, and wherein first side winding is serially connected in the primary circuit, and secondary side winding is serially connected in the load circuit.Current transformer can roughly be divided into Verification of Measuring Current Transformer, protective current transformer, according to the function of different windings, gets energy Current Transformer etc.
The current transformer that adopts in electronic breaker need be realized current detecting usually simultaneously and be the function of electronic unit power supply.The present common electronic circuit breaker that adopts generally adopts the double-current instrument transformer, has namely merged to be used for getting the energy Current Transformer and for the current transformer of measuring electric current, can realizing that so less primary current is to the accurate measurement of very big short circuit current of power supply.But can Current Transformer also there be two subject matters in getting in the double-current instrument transformer:
1, can Current Transformer utilize electromagnetic induction principle and the big electric current of primary side is become the little electric current of secondary side when getting, thereby when being the electronic unit power supply of circuit breaker, because it is very little that the consumption of electronic unit changes, then along with the increase of first side winding electric current, the excess energy that current transformer provides will be consumed by electronic unit and instrument transformer itself, and serious heating problem can appear in instrument transformer when the first side winding electric current is big like this.
2, when the first side winding electric current is big, the iron core of instrument transformer can take place saturated, magnetic flux no longer changes, this moment, secondary side winding can produce the very high burst pulse voltage of amplitude, this can cause the power circuit of electronic unit get can time shorter, thereby can not get access to enough energy, finally can influence the power supply to electronic unit.
Summary of the invention
In order to solve the problems of the technologies described above, the utility model provides a kind of current transformer, comprise the ring-shaped closed iron core that is of coupled connections with the primary circuit and be wound on secondary coil on iron core-closed, wherein iron core-closed can be laminated core structure, be provided with two grooves in the position of iron core-closed periphery symmetry, iron circuit sectional area that groove can make this place is set less than iron core-closed average magnetic circuit sectional area, the size of its further groove can be identical, also can be different.By adopting above-mentioned current transformer, when primary side current hour, groove does not exert an influence, instrument transformer generates little electric current by electromagnetic induction in secondary coil, give electronic unit (the being load) normal power supply that is connected on the secondary coil; When primary side current was big, because the groove sectional area is less, the magnetic flux of groove reached capacity earlier, and this moment, iron core-closed magnetic circuit was equivalent to out air gap, had improved the anti-saturation ability, thereby can work in bigger current range.And with the increase of primary side current, the variation of secondary side current is more steady, can provide longer, more stable electric energy supply of time for load.
Description of drawings
Fig. 1 is the schematic diagram of current transformer of the present utility model;
Embodiment
Below in conjunction with accompanying drawing the technical solution of the utility model is elaborated:
As shown in Figure 1, the current transformer that the utility model adopts, comprise the ring-shaped closed iron core 2 that is of coupled connections with primary circuit 1 and be wound on secondary coil 3 on iron core-closed 2, wherein iron core-closed 2 can be laminated core structure, the position of the periphery symmetry iron core-closed 2 is provided with two grooves 4, iron circuit sectional area that groove 4 can make this place is set less than iron core-closed 2 average magnetic circuit sectional area, the size of its further groove 4 can be identical, also can be different.Preferably, can even number groove greater than 2 be set in iron core-closed 2 peripheral circumferential, such as 4 or 8 etc., these grooves are symmetrically distributed perpendicular to iron core-closed magnetic circuit direction in iron core-closed 2 circumference upper edge.In addition, when groove is big along the length of magnetic circuit direction, having the loss of the part magnetic line of force comes, produce leakage flux, more leakage flux can reduce the energy conversion efficiency of instrument transformer, and in the circuit and the electronic unit of periphery produce electromagnetic interference, therefore preferably the fluted length sum along the magnetic circuit direction on iron core-closed 2 is made as 1/20 of iron core-closed circumference.
Like this, when secondary coil 3 was connected with load, according to electromagnetic induction principle, the electronic unit that current transformer becomes the big electric current of first side winding into the little electric current of secondary side winding and offers circuit breaker used.
When the electric current of first side winding hour, under the situation of given loading condition and iron core parameter, the secondary winding induced voltage of current transformer is relevant with its number of turn, therefore can select suitable coil turn to come the starting current of electron gain parts minimum according to given loading condition and iron core parameter.
When the electric current of first side winding increased more gradually, the magnetic flux of core interior progressively increased.Because the magnetic circuit sectional area of iron core-closed 2 upper groove positions is less than iron core-closed 2 average magnetic circuit sectional areas, then the magnetic flux density of this position is greater than the magnetic flux density of iron core other parts.When the electric current of first side winding increases to a certain degree, the iron core at iron core-closed 2 upper groove places will at first reach capacity, and this moment, the part iron core at this place lost ferromagnetism, and the iron core of other parts unsaturation still.This moment, this effective permeability of iron core-closed 2 declined to a great extent, and produced induced current but still can change with the electric current of first side winding, thereby provided load required electric energy.
Like this by the equivalent permeability of control current transformer magnetic circuit, make iron core-closed 2 under the big current conditions of first side winding, be difficult for saturated fully, the high amplitude burst pulse voltage of restriction output, increase simultaneously load etc. get can time.
Claims (5)
1. current transformer, comprise the ring-shaped closed iron core that is of coupled connections with the primary circuit and be wound on secondary coil on iron core-closed, it is characterized in that: be provided with two identical grooves in the position of iron core-closed periphery symmetry, groove be set make the iron circuit sectional area at this place less than iron core-closed average magnetic circuit sectional area.
2. current transformer as claimed in claim 1 is characterized in that iron core-closed is laminated core structure.
3. current transformer as claimed in claim 1 is characterized in that the size difference of 2 grooves.
4. current transformer as claimed in claim 1 is characterized in that in iron core-closed peripheral circumferential 4 or 8 grooves being set, and these grooves are symmetrically distributed perpendicular to iron core-closed magnetic circuit direction in iron core-closed circumference upper edge.
5. current transformer as claimed in claim 1, it is characterized in that iron core-closed the fluted length sum along the magnetic circuit direction be made as 1/20 of iron core-closed circumference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320069478 CN203179689U (en) | 2013-02-06 | 2013-02-06 | Current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320069478 CN203179689U (en) | 2013-02-06 | 2013-02-06 | Current mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203179689U true CN203179689U (en) | 2013-09-04 |
Family
ID=49076353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320069478 Expired - Fee Related CN203179689U (en) | 2013-02-06 | 2013-02-06 | Current mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203179689U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103137311A (en) * | 2013-02-06 | 2013-06-05 | 陕西富集电力科技股份有限公司 | Current transformer |
| CN106653325A (en) * | 2016-12-09 | 2017-05-10 | 徐超 | Induction equipment |
| TWI688188B (en) * | 2019-03-22 | 2020-03-11 | 友達光電股份有限公司 | Energy harvesting device, energy coupling unit and energy harvesting method |
-
2013
- 2013-02-06 CN CN 201320069478 patent/CN203179689U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103137311A (en) * | 2013-02-06 | 2013-06-05 | 陕西富集电力科技股份有限公司 | Current transformer |
| CN106653325A (en) * | 2016-12-09 | 2017-05-10 | 徐超 | Induction equipment |
| TWI688188B (en) * | 2019-03-22 | 2020-03-11 | 友達光電股份有限公司 | Energy harvesting device, energy coupling unit and energy harvesting method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20160206 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |