CN202736708U - Single-turn heart-penetrating type current mutual inductor - Google Patents
Single-turn heart-penetrating type current mutual inductor Download PDFInfo
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- CN202736708U CN202736708U CN 201220292604 CN201220292604U CN202736708U CN 202736708 U CN202736708 U CN 202736708U CN 201220292604 CN201220292604 CN 201220292604 CN 201220292604 U CN201220292604 U CN 201220292604U CN 202736708 U CN202736708 U CN 202736708U
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Abstract
The utility model discloses a single-turn heart-penetrating type current mutual inductor which is used for measuring. The single-turn heart-penetrating type current mutual inductor comprises a first coil, a second coil, a first lead, a second lead, a first insert and a second insert. The first lead is respectively connected with a first end head of the first coil and a first end head of the second coil. The second lead is respectively connected with a second end head of the first coil and a second end head of the second coil. The first insert is connected with the middle position of the first lead, and the second insert is connected with the middle position of the second lead. The two same coils are connected in parallel, each coil is that two secondary windings are connected in series, and the number of turns of the each coil is two times of the theoretical number of turns of a current mutual inductor. When an inputted primary current reaches or is slightly higher than a rated primary current, a series-connection secondary winding can not reach a magnetic saturation wire, so than an outputted secondary current is not influenced, and therefore, accuracy veracity of the current mutual inductor is guaranteed.
Description
Technical field
The utility model belongs to the instrument transformer field, relates in particular to a kind of current transformer with single-turn cored structure.
Background technology
In order to guarantee the power system security economical operation, must carry out monitoring and measuring to the ruuning situation of power equipment.General measurement and protective device can not directly access high-tension apparatus No. one time, and need Current Transformer that large electric current (primary current) scaling transformation of primary system is become little electric current (secondary current), supply with measuring instrument and protective device and use.
Current transformer is divided into Verification of Measuring Current Transformer and protective current transformer.
Verification of Measuring Current Transformer is to be used for metering (charging) and measurement operational outfit electric current.
The measuring current transformer with single-turn cored structure of using in the electric network terminal large-scale popularization at present, be that primary line only directly once connects and passes secondary coil, referring to accompanying drawing 1, itself structure of straight-through current transformer is not established winding one time, and current-carrying (load current) wire is passed by L1 to L2 and rolls circle (or other shapes) iron core that rolls into by silicon steel sheet and play a winding effect.Be wrapped in the secondary winding Direct Uniform and form secondary coil on the circular iron core, the number of turn of secondary winding is the theoretical number of turn of current transformer, and secondary coil is connected with the secondary load of the current coils such as instrument, relay, transmitter and formed the closed-loop path.
But adopt the most instrument transformer of this frame mode can guarantee precision at low side, when the primary current of inputting reaches or slightly surpass rated primary current, magnetic saturation occurs, precision reduces rapidly.
The utility model content
In view of this, the purpose of this utility model is to provide a kind of current transformer with single-turn cored structure, by two coils are set, each coil comprises respectively the secondary winding of two series connection, the number of turn that is each coil is the theoretical number of turn twice of current transformer, and in parallel described two coils form secondary coil, and the primary current that has guaranteed input reaches specified or when slightly surpassing primary current, magnetic saturation can be do not occurred, precision can be do not affected.
A kind of current transformer with single-turn cored structure, described current transformer are used for measuring, and comprising:
The first coil;
The second coil;
The first lead-in wire that links to each other with the first termination of the first termination of described the first coil and described the second coil respectively;
The second lead-in wire that links to each other with the second termination of the second termination of described the first coil and described the second coil respectively;
The first inserts that links to each other with described the first lead-in wire centre position;
The second inserts that links to each other with described the second lead-in wire centre position.
Above-mentioned current transformer, preferred, described the first coil comprises:
The first iron core;
The first secondary winding;
The second secondary winding;
Wherein, described the first secondary winding and the second secondary windings in series, and successively uniform winding on described the first iron core.
Above-mentioned current transformer, preferred, described the second coil comprises:
The second iron core;
The 3rd secondary winding;
The 4th secondary winding;
Wherein, described the 3rd secondary winding and the 4th secondary windings in series, and successively uniform winding on described the second iron core.
Above-mentioned current transformer, preferred, also comprise:
Be arranged between described the first coil and the second coil, to the insulate insulating paper of isolation of described the first coil and the second coil.
Above-mentioned current transformer, preferred, also comprise:
Be arranged at the insulation crust of described the first coil and the second coil outside.
Above-mentioned current transformer, preferred, also comprise:
The mounting bracket that matches with described insulation crust bottom.
Above-mentioned current transformer, preferred, the center hole of described current transformer is circular hole.
Above-mentioned current transformer, preferred, the material of described insulation crust comprises 196 unsaturated-resins.
Above-mentioned current transformer, preferred, described insulating paper comprises crimped paper.
A kind of current transformer with single-turn cored structure that the utility model provides, described current transformer are used for measuring, and comprising: the first coil; The second coil; The first lead-in wire that links to each other with the first termination of the first termination of described the first coil and described the second coil respectively; The second lead-in wire that links to each other with the second termination of the second termination of described the first coil and described the second coil respectively; The first inserts that links to each other with described the first lead-in wire centre position; The second inserts that links to each other with described the second lead-in wire centre position.A kind of current transformer with single-turn cored structure that adopts the utility model to provide, two identical coils are in parallel, winding winding on each coil is the secondary winding of two series connection, the winding number of turn that is each coil is the twice of the theoretical number of turn of current transformer, when the primary current of input reaches or during a little more than specified primary current, the secondary winding of series connection does not reach the magnetic saturation line, and the secondary current of output is unaffected, has guaranteed the precision accuracy of described current transformer.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is straight-through current transformer structure principle chart in the prior art;
Fig. 2 is the structural representation of a kind of current transformer with single-turn cored structure embodiment of providing of the utility model;
Fig. 3 is the concrete structure schematic diagram of a kind of current transformer with single-turn cored structure embodiment of providing of the utility model;
Fig. 4 is the front view of a kind of current transformer with single-turn cored structure embodiment of providing of the utility model;
Fig. 5 is the another kind of structural representation of a kind of current transformer with single-turn cored structure embodiment of providing of the utility model;
Fig. 6 is the schematic diagram of a kind of current transformer with single-turn cored structure of providing of the utility model.
Mark is as follows in the accompanying drawing:
101-the first coil, 102-the second coil, 103-the first lead-in wire, 104-the second lead-in wire, 105-the first inserts, 106-the second inserts, 107-insulating paper, 108-insulation crust, 109-mounting bracket;
1011-the first iron core, 1012-the first secondary winding, 1013-the second secondary winding.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model embodiment clearer, below in conjunction with the accompanying drawing among the utility model embodiment, technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
A kind of current transformer with single-turn cored structure that the utility model provides is used for measuring (charging) and measures the operational outfit electric current in the practical application.
Referring to Fig. 2, show the structural representation of a kind of current transformer with single-turn cored structure embodiment that the utility model provides, comprising: the first coil 101, the second coil 102, the first lead-in wire the 103, second lead-in wire the 104, first inserts 105 and the second inserts 106.
The first coil 101 and the second coil 102 are identical.
Wherein, referring to Fig. 3, show the concrete structure schematic diagram of the first coil 101, comprising:
The first iron core 1011, the first secondary winding 1012 and the second secondary winding 1013;
Wherein, described the first secondary winding 1012 and the series connection of the second secondary winding 1013, and successively uniform winding on described the first iron core 1011.
The winding winding of the first coil 101 is that the first secondary winding 1012 and the series connection of the second secondary winding 1013 obtain, and the first secondary winding 1012 and the second secondary winding 1013 are identical, after the two series connection successively uniform winding on the first iron core 1011.When the number of turns of secondary winding winding was N, the winding number of turns of described the first coil 101 was 2N, and the winding number of turns of the first coil 101 is 2 times of secondary winding, and namely the winding number of turn of the first coil 101 is the twice of the theoretical number of turn of current transformer.
The second coil 102 is identical with the structure of the first coil 101, comprising:
The second iron core 1021, the 3rd secondary winding 1022 and the 4th secondary winding 1023;
Wherein, described the 3rd secondary winding 1022 and the series connection of the 4th secondary winding 1023, and successively uniform winding on described the second iron core 1021.
The winding winding of the second coil 102 is that the 3rd secondary winding 1022 and 1023 series connection of the 4th secondary winding obtain, the 3rd secondary winding 1022 and the 4th secondary winding 1023 are identical, the first secondary winding 1011 of the 3rd secondary winding 1022 and the first coil 101 is identical, after the 3rd secondary winding 1022 and the series connection of the 4th secondary winding 1023 successively uniform winding on the second iron core 1021.When the number of turns of secondary winding winding was N, the winding number of turns of described the second coil 102 was 2N, and the winding number of turns of the second coil 102 is 2 times of secondary winding, and namely the winding number of turn of the second coil 102 is the twice of the theoretical number of turn of current transformer.
Referring to Fig. 4, show the front view of a kind of current transformer with single-turn cored structure that the embodiment of the present application provides, because main apparent direction, the first inserts 105 and the second inserts 106 are positioned on the same level line, the first lead-in wire the 103 and second lead-in wire 104 also is positioned on the same level line, so the inserts that indicates among the figure represents the first inserts 105 and the second inserts 106, the lead-in wire that indicates among the figure represents the first lead-in wire the 103 and second lead-in wire 104.
Described the first iron core 1011 and the second iron core 1021 are circular, adapt with it, and the center hole of current transformer is circular hole.
The two ends of the first lead-in wire 103 link to each other with the first termination S1 of the first coil 101 and the first termination S1 ' of the second coil 102 respectively, the centre position of the first lead-in wire 103 is that non-end positions is connected with the first termination S1 ' that connects respectively successively the first termination S1, the first inserts 105 and second coil 102 of the first coil 101 on the first inserts 105, the first lead-in wires 103.
The two ends of the second lead-in wire 104 link to each other with the second termination S2 of the first coil 101 and the second termination S2 ' of the second coil 102 respectively, the centre position of the second lead-in wire 104 is that non-end positions is connected with the second termination S2 ' that connects respectively successively the second termination S2, the second inserts 106 and second coil 102 of the first coil 101 on the second inserts 106, the second lead-in wires 104.
The first lead-in wire 103, second lead-in wire the 104, first inserts 105 and the second inserts 106 are together in parallel the first coil 101 and the second coil 102, when the large electric current of primary system enters current transformer, 102 pairs of primary current shuntings of the first coil 101 and the second coil, with the first coil 101 and the respectively little electric current merging of conversion of the second coil 102, export rated secondary currents to electrical secondary system by the first inserts 105 and the second inserts 106 that link to each other with electrical secondary system.
The wound convolution number average of the first coil and the second coil is 2N, and namely 2 times of the theoretical required number of turn of current transformer (N circle), behind the first coil and the second coils from parallel connection of coils, the effect curent change is identical with secondary winding.And the winding number of turn of the first coil and the second coil is 2 times of the theoretical number of turn of current transformer, so magnetic saturation electric current when causing magnetically saturated electric current that their produce much larger than the theoretical number of turn of current transformer, the rated primary current of current transformer is the rated primary current of secondary winding, magnetic saturation do not occur so can not reach because of the primary current of input or omit above rated primary current, cause precision to reduce.
From the above, a kind of current transformer with single-turn cored structure that the utility model embodiment provides, comprise the first lead-in wire, the second lead-in wire, the first inserts, the second inserts, identical the first coil and the second coil, the two ends of the first lead-in wire link to each other with the first termination of the first coil and the first termination of the second coil respectively, and the two ends of the second lead-in wire link to each other with the second termination of the first coil and the second termination of the second coil respectively; The first inserts links to each other with described the first lead-in wire centre position; The second inserts links to each other with described the second lead-in wire centre position.The first lead-in wire, the second lead-in wire, the first inserts and the second inserts are with the first coil and the second coils from parallel connection of coils.
Show the another kind of structural representation of a kind of current transformer with single-turn cored structure that the present embodiment provides referring to Fig. 5, also comprise: insulating paper 107, insulation crust 108, mounting bracket 109.
Wherein, described insulating paper 107 is arranged between described the first coil 101 and the second coil 102, to the isolation of insulating of described the first coil 101 and the second coil 102;
The first coil 101 and the second coil 102 are arranged side by side, in order to reduce the electromagnetic interference between the first coil 101 and the second coil 102, insulating paper 107 isolation of insulating are set between the first coil 101 and the second coil 102.Can adopt the wrapping of crimped paper half lap to do the insulation of the first coil 101 and the second coil 102.
Wherein, described insulation crust 108 is arranged at described the first coil 101 and the second coil 102 outsides;
Be subject to external electromagnetic interference for fear of the first coil 101 and the second coil 102, jamming-proof 196 unsaturated-resin insulation crusts 108 be set the first coil 101 and the second coil 102 are outer.
In the actual production process, this insulation crust can be arranged on the first coil 101 and the second coil 102 outsides by pouring type.
Insulation crust act as insulation, also play the fixing effect of coil simultaneously.
The material of the insulation crust among the utility model embodiment is 196 unsaturated-resins, but is not limited to this, in actual the enforcement, also can adopt other insulating material.
Wherein, described mounting bracket 109 matches with described insulation crust 108 bottoms.
Be provided with the mounting bracket 109 that usefulness is installed in insulation crust 108 bottoms, current transformer is installed to default installation site by mounting bracket.
Referring to Fig. 6, show the schematic diagram of a kind of current transformer with single-turn cored structure that the utility model embodiment provides, coil between P1, the P2 is primary winding, this primary winding is connected with power supply, the input primary current just refers to that in utility model embodiment primary winding directly once connects the center hole that passes secondary coil, and the coil between S1, the S2 is exactly the first coil, coil between S1 ', the S2 ' is exactly the second coil, and what the first coil and the second coils from parallel connection of coils obtained is secondary coil.Include only secondary coil in a kind of current transformer with single-turn cored structure that the utility model embodiment provides, the primary winding between P1, the P2 is not included in wherein.
Primary winding is connected with power supply, power supply output primary current, and this primary current is large electric current, because the electromagnetic induction between primary winding and the secondary coil, secondary coil produces induced current and is secondary current, and secondary current is little electric current, by the S1 of secondary coil ", S2 " termination output.
From the above, the current transformer with single-turn cored structure of the another kind of structure that the utility model embodiment provides arranges insulating paper between the first coil and the second coil, prevent the mutual interference of two coil phases; Outside the first coil and the second coil, insulation crust is set, anti-tampering external disturbance; In the insulation crust bottom mounting bracket is set.Guaranteed in the element course of work in the current transformer interference-free.
The above only is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (9)
1. a current transformer with single-turn cored structure is characterized in that, described current transformer is used for measuring, and comprising:
The first coil;
The second coil;
The first lead-in wire that links to each other with the first termination of the first termination of described the first coil and described the second coil respectively;
The second lead-in wire that links to each other with the second termination of the second termination of described the first coil and described the second coil respectively;
The first inserts that links to each other with described the first lead-in wire centre position;
The second inserts that links to each other with described the second lead-in wire centre position.
2. current transformer according to claim 1 is characterized in that, described the first coil comprises:
The first iron core;
The first secondary winding;
The second secondary winding;
Wherein, described the first secondary winding and the second secondary windings in series, and successively uniform winding on described the first iron core.
3. current transformer according to claim 1 is characterized in that, described the second coil comprises:
The second iron core;
The 3rd secondary winding;
The 4th secondary winding;
Wherein, described the 3rd secondary winding and the 4th secondary windings in series, and successively uniform winding on described the second iron core.
4. current transformer according to claim 1 is characterized in that, also comprises:
Be arranged between described the first coil and the second coil, to the insulate insulating paper of isolation of described the first coil and the second coil.
5. current transformer according to claim 1 is characterized in that, also comprises:
Be arranged at the insulation crust of described the first coil and the second coil outside.
6. current transformer according to claim 1 is characterized in that, also comprises:
The mounting bracket that matches with described insulation crust bottom.
7. current transformer according to claim 1 is characterized in that, the center hole of described current transformer is circular hole.
8. current transformer according to claim 5 is characterized in that, the material of described insulation crust comprises 196 unsaturated-resins.
9. current transformer according to claim 4 is characterized in that, described insulating paper comprises crimped paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220292604 CN202736708U (en) | 2012-06-20 | 2012-06-20 | Single-turn heart-penetrating type current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220292604 CN202736708U (en) | 2012-06-20 | 2012-06-20 | Single-turn heart-penetrating type current mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202736708U true CN202736708U (en) | 2013-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220292604 Expired - Fee Related CN202736708U (en) | 2012-06-20 | 2012-06-20 | Single-turn heart-penetrating type current mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202736708U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915247A (en) * | 2014-04-25 | 2014-07-09 | 江苏科兴电器有限公司 | Single-turn high-precision current transformer |
| CN110265212A (en) * | 2019-08-02 | 2019-09-20 | 登高电气有限公司 | A kind of coil assembly and production technology of current transformer |
-
2012
- 2012-06-20 CN CN 201220292604 patent/CN202736708U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915247A (en) * | 2014-04-25 | 2014-07-09 | 江苏科兴电器有限公司 | Single-turn high-precision current transformer |
| CN110265212A (en) * | 2019-08-02 | 2019-09-20 | 登高电气有限公司 | A kind of coil assembly and production technology of current transformer |
| WO2021023115A1 (en) * | 2019-08-02 | 2021-02-11 | 登高电气有限公司 | Coil assembly of current transformer, and manufacturing method |
| CN110265212B (en) * | 2019-08-02 | 2024-03-26 | 登高电气有限公司 | Production process of coil assembly of current transformer |
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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: 20130213 Termination date: 20150620 |
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| EXPY | Termination of patent right or utility model |