CN102360892A - Current mutual inductor - Google Patents
Current mutual inductor Download PDFInfo
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- CN102360892A CN102360892A CN2011103259283A CN201110325928A CN102360892A CN 102360892 A CN102360892 A CN 102360892A CN 2011103259283 A CN2011103259283 A CN 2011103259283A CN 201110325928 A CN201110325928 A CN 201110325928A CN 102360892 A CN102360892 A CN 102360892A
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- transformer
- iron core
- mutual inductor
- current
- current mutual
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Abstract
The invention relates to a current mutual inductor, in particular to a current mutual inductor which is mounted on a lead wire of a device body of a transformer, belonging to the technical field of a mutual inductor. The technical scheme provided by the invention is as follows: the current mutual inductor comprises an iron core (1), an insulator (2), a secondary winding (3) and a shielding winding (4); one or more air gaps are arranged on the iron core; the insulator is wound on the iron core; the secondary winding is wound outside the insulator; and the shielding winding is further wound outside the secondary winding. The shielding winding consists of a plurality of windings in pair so that electric potentials sensed in the windings of a main magnetic flux are mutually balanced out; a circulating current is formed by an electric potential difference, which is generated by a difference of the magnetic flux generated by each part of the iron core, by using a leakage magnetic field of the transformer so as to reduce the influence on the leakage magnetic field of the transformer; and the influence on the leakage magnetic field of the transformer is minimized so that the iron core is difficult to saturate. The current mutual inductor provided by the invention has the advantages in that: by mounting on the lead wire of the device body of the transformer, when inrush current or short-circuit current flows, the current mutual inductor can be used for ensuring the specified accuracy, does not protect misoperations, and guarantees safety of a power grid.
Description
Technical field
The present invention relates to a kind of current transformer, particularly be installed in the current transformer on the transformer body lead-in wire, belong to the instrument transformer technical field.
Background technology
The transformer Current Transformer generally is contained in the rising seat of oil tank of transformer, also has to be installed on the device body lead-in wire.This moment, the leakage field of transformer possibly exert an influence to the class of accuracy of current transformer, and leakage field was less when transformer normally moved, when transformer put into operation, out of service or when external short circuit takes place; Magnetizing inrush current or short circuit current are bigger, and DC component is arranged, and the transformer leakage field is also very big; Add the effect of DC component, might make current transformer unshakable in one's determination local saturated, influence the accuracy of current transformer; And then cause the protection misoperation, the safe operation of electrical network is caused very big threat.
Summary of the invention
The purpose of this invention is to provide a kind of current transformer, be installed on the transformer body lead-in wire, when magnetizing inrush current or short circuit current flow through; Current transformer can guarantee the accuracy of regulation; Unlikely protection misoperation, the safety of assurance electrical network solves the problems referred to above that background technology exists.
Technical scheme of the present invention is: a kind of current transformer; Be installed on the transformer body lead-in wire, comprise iron core, insulation, secondary winding and shielding winding, one or several air gaps are set on the iron core; On iron core, twine insulation; Secondary winding is twined in the outside, twines the shielding winding again in the outside of secondary winding, and this current transformer is installed in the transformer body lead-in wire and goes up use.
The present invention is provided with one or several air gaps on the iron core of current transformer; To reduce remanent magnetism unshakable in one's determination, remanent magnetism is limited in the lower scope, add around the shielding winding in the secondary winding outside simultaneously; Said shielding winding is several paired windings; The electromotive force that main flux is responded to is therein cancelled each other, and utilizes Magnetic Leakage Field of Transformer to form circulation in the electrical potential difference that difference produced of the magnetic flux of various piece generation unshakable in one's determination, to reduce the influence of Magnetic Leakage Field of Transformer; The influence of transformer leakage field is dropped to minimum, it is saturated that iron core is not easy.
Be chosen to right shielding umber of turn, around cancelling each other to the electromotive force that main flux is responded to therein with bind mode, reduce of the influence of transformer leakage field to current transformer.
Good effect of the present invention: be installed on the transformer body lead-in wire, when magnetizing inrush current or short circuit current flow through, current transformer can guarantee the accuracy stipulated, unlikely protection misoperation, the safety of assurance electrical network.
Description of drawings
Fig. 1 is the embodiments of the invention sketch mapes;
Among the figure: iron core 1, insulation 2, secondary winding 3 and shielding winding 4.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further specified through embodiment.
A kind of current transformer; Be installed on the transformer body lead-in wire, comprise iron core 1, insulation 2, secondary winding 3 and shielding winding 4, on the iron core 1 one or several air gaps are set; On iron core, twine insulation 2; Secondary winding 3 is twined in the outside, twines shielding winding 4 again in the outside of secondary winding 3, and this current transformer is installed in the transformer body lead-in wire and upward uses.
The present invention is provided with one or several air gaps on the iron core of current transformer; To reduce remanent magnetism unshakable in one's determination, remanent magnetism is limited in the lower scope, add around the shielding winding in the secondary winding outside simultaneously; Said shielding winding is several paired windings; The electromotive force that main flux is responded to is therein cancelled each other, and utilizes Magnetic Leakage Field of Transformer to form circulation in the electrical potential difference that difference produced of the magnetic flux of various piece generation unshakable in one's determination, to reduce the influence of Magnetic Leakage Field of Transformer; The influence of transformer leakage field is dropped to minimum, it is saturated that iron core is not easy.
Claims (1)
1. current transformer; Be installed on the transformer body lead-in wire, it is characterized in that comprising iron core (1), insulation (2), secondary winding (3) and shielding winding (4), one or several air gaps are set on the iron core; On iron core, twine insulation; Secondary winding is twined in the outside, twines the shielding winding again in the outside of secondary winding, and this current transformer is installed in the transformer body lead-in wire and goes up use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103259283A CN102360892A (en) | 2011-10-25 | 2011-10-25 | Current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103259283A CN102360892A (en) | 2011-10-25 | 2011-10-25 | Current mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102360892A true CN102360892A (en) | 2012-02-22 |
Family
ID=45586180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103259283A Pending CN102360892A (en) | 2011-10-25 | 2011-10-25 | Current mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102360892A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2580578Y (en) * | 2002-10-22 | 2003-10-15 | 沈阳互感器厂（有限公司） | Current mutual inductor of generator main loop |
| CN201315220Y (en) * | 2008-11-20 | 2009-09-23 | 平高集团有限公司 | TPY-level transient current mutual inductor coil |
| CN201340797Y (en) * | 2009-02-13 | 2009-11-04 | 保定天威集团有限公司 | Large current transformer used for generator outlet |
-
2011
- 2011-10-25 CN CN2011103259283A patent/CN102360892A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2580578Y (en) * | 2002-10-22 | 2003-10-15 | 沈阳互感器厂（有限公司） | Current mutual inductor of generator main loop |
| CN201315220Y (en) * | 2008-11-20 | 2009-09-23 | 平高集团有限公司 | TPY-level transient current mutual inductor coil |
| CN201340797Y (en) * | 2009-02-13 | 2009-11-04 | 保定天威集团有限公司 | Large current transformer used for generator outlet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120222 |