CN201859770U - High-precision current transformer - Google Patents
High-precision current transformer Download PDFInfo
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- CN201859770U CN201859770U CN2010205991402U CN201020599140U CN201859770U CN 201859770 U CN201859770 U CN 201859770U CN 2010205991402 U CN2010205991402 U CN 2010205991402U CN 201020599140 U CN201020599140 U CN 201020599140U CN 201859770 U CN201859770 U CN 201859770U
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- current transformer
- annular core
- core
- amorphous alloy
- precision current
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Abstract
The utility model discloses a high-precision current transformer which is used for improving the performance of the current transformer and reducing the measurement error of electric energy. The high-precision current transformer adopts the technical scheme that the current transformer comprises an annular core, as well as a primary coil and a secondary coil which are coiled on the annular core, wherein the annular core is formed by coiling strap silicon-steel sheets and amorphous alloy sheets which are overlapped. The annular core is formed by coiling the strap silicon-steel sheets and the amorphous alloy sheets, so that the high-precision current transformer not only has the characteristic of high-saturation magnetic induction of a silicon-steel core, but also has the advantage of high initial magnetic permeability of an amorphous alloy core, can not only keep good linearity in case of high current, but also have high sensitiveness in case of low current, and has effectively improved technical characteristics in case of low loading.
Description
Technical field
The utility model relates to the current transformer that a kind of power industry is used, and belongs to the power technology field.
Background technology
At present, current transformer in the distribution network still extensively adopts traditional silicon steel core or FERRITE CORE, its advantage is cheap, mechanical stress is little, processing and fabricating is easy, particularly saturation induction density occupies first of the soft magnetic material, reach 20000GS above (2.03T international system of units), thereby the high-end electromagnetic property of instrument transformer is better.But because the silicon steel material structure belongs to periodically crystal lattice structure, exist defectives such as crystal grain, crystal boundary, dislocation, interstitial atom and magnetocrystalline anisotropy, cause the instrument transformer iron loss big, magnetic permeability is low, and the power transfer function is relatively poor.Especially when little electric current, the current detecting sensitivity of instrument transformer is low, brings than mistake to electric energy metrical.
Non-crystaline amorphous metal is a kind of new material, has excellent magnetism, stronger corrosion resistance and resistance to wear, high strength, high rigidity, good toughness, high resistivity and very strong mechanical-electric coupling function.Owing to there is not the defective of crystalline material magnetocrystalline anisotropy, each point magnetic anomaly uniformity, very good by the instrument transformer equilibrium response that non-crystaline amorphous metal substituted for silicon steel is made, have very high sensitivity during little electric current.
If can the iron core of existing instrument transformer be improved, make it to have concurrently the advantage of traditional silicon steel core and amorphous alloy iron core, will improve the performance of instrument transformer greatly, reduce the error of electric energy metrical.
The utility model content
The purpose of this utility model is the high precision current transformer that overcomes the deficiencies in the prior art, a kind of function admirable is provided.
The purpose of this utility model realizes with following technical proposals:
A kind of high precision current transformer is made up of annular core and the primary coil and the secondary coil that are wound on the annular core, and described annular core is reeled by banded silicon steel sheet that is stacked together and amorphous alloy film and formed.
Above-mentioned high precision current transformer, the thickness of described silicon steel sheet are 0.2 millimeter, and the thickness of described amorphous alloy film is 0.02～0.03 millimeter.
Iron core of the present utility model is reeled by banded silicon steel sheet and amorphous alloy film and is formed, thereby both had a characteristic of the high saturated magnetic strength of silicon steel core, has the high advantage of amorphous alloy iron core initial magnetic permeability again, not only when big electric current, can keep favorable linearity, and very high sensitivity is also arranged when little electric current, effectively improved the technical characteristic when instrument transformer is low to be carried.In addition, owing to adopt annular core, the utility model also has characteristics such as leakage field is few, volume is little, efficient is high, overload capacity is strong.
Description of drawings
Fig. 1 is a schematic diagram of the present utility model;
Fig. 2 is the structural representation of iron core.
Each label is among the figure: 1, silicon steel sheet; 2, amorphous alloy film; TX, iron core; L1, primary coil; L2, secondary coil.
Embodiment
Referring to Fig. 1, Fig. 2, mainly be that the non-linear of magnetization curve and magnetic saturation phenomenon cause at the error origin cause of formation of conventional current instrument transformer, the pluses and minuses of all kinds of soft magnetic materials of analysis-by-synthesis, the transformer iron core of two kinds of compound compositions of material has been adopted in design.First silicon steel sheet is taken the characteristic of its high saturated magnetic strength; Its two alloy of forming by Fe, No, Cu, Si, B, Ti when liquid state through the formed amorphous alloy film of fast solidification technology, this amorphous material obtains the crystallite of diameter 10-20nm through Overheating Treatment, disperse is distributed on amorphous matrix, is called micro crystal material or nanocrystalline material.Though the more aforementioned iron based amorphous material of the performance parameter that this material has low spot, most indexs and combination property are suitable with it.And solved the fragility of material, the problem of aspects such as noise and parameter dispersiveness is that a kind of processed is easy, excellent performance and the novel soft magnetic material of less expensive.Through repetition test, the optimum thickness that obtains two kinds of materials cooperates.
The characteristic and the technical essential of compound iron core current transformer are as follows:
1, during little electric current,, improved the sensitivity of current detecting, improved the technical characteristic when instrument transformer is low to be carried because nanocrystalline material has higher initial magnetic permeability.
2, the characteristics that keep the high saturated magnetic strength of silicon steel material have been improved the technical characteristic of the high load end of current transformer, when 1.2 times of rated current, can keep favorable linearity;
3, use the silicon steel material iron core separately, during less than 25% rated load, its error promptly may exceed limit value at actual load.Two kinds of materials that employing has complementary functions are made the iron core of current transformer, guarantee that product can keep good linearty and accuracy of measurement under the wide load of 1%-120% rated current, and ratio, angular difference all drop to extremely low, guarantee the accuracy class of electric energy metrical.
When 4, test line was short-circuited fault, instrument transformer was saturated in suitable range ability, with the protection measuring instrument;
5, good stability, variation is little, and variation can be ignored in 5 years;
6, remanent magnetism is little, when use and verification, generally need not to do demagnetization and handles;
7, secondary winding adopts the fractional turns compensation, and error is little;
8, adopt annular core, its advantage is:
1. leakage field is few, and is magnetic circuit closed, no seam;
2. loss is little, and temperature rise is low, the efficient height;
3. internal resistance is little.Reaction is fast, and overload capacity is strong;
4. volume is little, and is in light weight.
9, the secondary coiling is evenly distributed, and makes impregnation process, with the fixed position.Winding inductance quantity is evenly distributed, and has reduced the influence of magnetostrictive force, has reduced swing and noise.
10, adopt the shell of flame-retardant plastic, full-closed structure, moisture resistance is good, and the binding post place has carried out suitable processing, prevents from the artificial short electricity-filching of instrument transformer secondary lead terminal.
Iron core of the present utility model also is applicable to the cylindricality iron core except that adopting annular.
Claims (2)
1. high precision current transformer, form by annular core (TX) and the primary coil (L1) and the secondary coil (L2) that are wound on the annular core (TX), it is characterized in that described annular core (TX) is reeled by banded silicon steel sheet (1) that is stacked together and amorphous alloy film (2) and formed.
2. according to the described high precision current transformer of claim 1, it is characterized in that the thickness of described silicon steel sheet is 0.2 millimeter, the thickness of described amorphous alloy film is 0.02～0.03 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205991402U CN201859770U (en) | 2010-11-09 | 2010-11-09 | High-precision current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205991402U CN201859770U (en) | 2010-11-09 | 2010-11-09 | High-precision current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201859770U true CN201859770U (en) | 2011-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205991402U Expired - Fee Related CN201859770U (en) | 2010-11-09 | 2010-11-09 | High-precision current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201859770U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946085A (en) * | 2012-12-04 | 2013-02-27 | 广东佛电电器有限公司 | Wide-dynamic-range residual current protection device |
| CN105826067A (en) * | 2016-05-19 | 2016-08-03 | 中国电力科学研究院 | Current transformer |
| CN108399995A (en) * | 2018-02-09 | 2018-08-14 | 宁波耀峰液压电器有限公司 | A kind of magnetic guarantor type electromagnet |
-
2010
- 2010-11-09 CN CN2010205991402U patent/CN201859770U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946085A (en) * | 2012-12-04 | 2013-02-27 | 广东佛电电器有限公司 | Wide-dynamic-range residual current protection device |
| CN105826067A (en) * | 2016-05-19 | 2016-08-03 | 中国电力科学研究院 | Current transformer |
| CN105826067B (en) * | 2016-05-19 | 2023-12-26 | 中国电力科学研究院 | Current Transformer |
| CN108399995A (en) * | 2018-02-09 | 2018-08-14 | 宁波耀峰液压电器有限公司 | A kind of magnetic guarantor type electromagnet |
| CN108399995B (en) * | 2018-02-09 | 2021-01-29 | 宁波耀峰液压电器有限公司 | Magnetic protection type electromagnet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: LI BAOMING Free format text: FORMER OWNER: FENG XUEXUE Effective date: 20140113 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 053600 HENGSHUI, HEBEI PROVINCE TO: 102200 CHANGPING, BEIJING |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20140113 Address after: 102200 Beijing city Changping District South South Building No. 203 Patentee after: Li Baoming Address before: 053600 hot spring area 9-2-302, Anping County, Hebei, Hengshui Patentee before: Feng Xuexue |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151010 Address after: 053600, No. five, 15 East Road, Anping Industrial Park, Hebei, Hengshui Patentee after: Anping County, Beijing Kay Technology Co., Ltd. Address before: 102200 Beijing city Changping District South South Building No. 203 Patentee before: Li Baoming |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110608 Termination date: 20151109 |