CN1020520C - High permeance current transformer - Google Patents
High permeance current transformer Download PDFInfo
- Publication number
- CN1020520C CN1020520C CN 90106748 CN90106748A CN1020520C CN 1020520 C CN1020520 C CN 1020520C CN 90106748 CN90106748 CN 90106748 CN 90106748 A CN90106748 A CN 90106748A CN 1020520 C CN1020520 C CN 1020520C
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- CN
- China
- Prior art keywords
- winding
- iron core
- current transformer
- auxiliary
- main iron
- 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.)
- Expired - Fee Related
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Abstract
The present invention relates to a high permeance current transformer. Auxiliary windings Wc 1 and Wc 2 are respectively wound on main iron cores 1 and 2. The polarity ends of the auxiliary windings Wc 1 and Wc 2 are connected together in the mode of opposite vertex, and the non-polarity ends are respectively connected with both ends of an excitation winding Wa. The excitation winding Wa and a compensation winding Wb are simultaneously wound on an auxiliary iron core 3; the main iron cores 1 and 2 have the same geometric size and the same material; the auxiliary windings Wc 1 and Wc 2 have the same number of turns. The present invention has the advantages of simple manufacturing technique, convenient debugging and wide application range. The present invention can increase the permeability of the main iron cores and can reduce the error of a current transformer. Moreover, the precision of the current transformer is increased by 1 to 2 grades.
Description
The invention belongs to the current transformer of a kind of high permeance in the electric product.
At present, magnetic shunt compensation method or zero flux compensation method are mostly adopted in the design of general current transformer.Magnetic shunt compensation ratio juris line map is as shown in Figure 1: 1 is that the main iron core, 2 of current transformer is magnetic shunt, secondary winding W
2In W is arranged
bCircle only on main iron core 1, that is to say on the magnetic shunt 2 few around W
bThe circle pitch of the laps, W
bCompensate the number of turn exactly, at this moment the magnetic on the magnetic shunt is close just close far above the magnetic on the main iron core 1, then when operating current also hour, magnetic shunt has just reached the working point of permeability maximum, thereby can turn round flat ratio difference curve, plays the nonlinear compensation effect.Zero flux compensation ratio juris line map as shown in Figure 2; 1 is the main iron core of current transformer, and 2 is the auxiliary iron core of current transformer, at secondary winding W
2In, W
B1Only on main iron core 1, and W
B2But only on auxiliary iron core 2, impedance Z be its compensating impedance, and compensation principle is such: when its compensating impedance Z equates with its Current Transformer Secondary referring impedance, then the magnetic on the main iron core 1 connect airtight closely zero, thereby reduced the error of current transformer.More than discuss and see described in " electrical measurement and instrument " 1971.NO1-4.
The objective of the invention is at above the deficiencies in the prior art part, design a kind of current transformer with high permeance, it can be excitatory separately, improve the permeability of current transformer core, that is to say does not need to increase the error that comparatively complicated compensating element, just can reduce current transformer, thereby realizes improving the accuracy class of current transformer.
The present invention finishes as follows: shown in Figure 3 is scheme circuit of the present invention.The current transformer of this high magnetic characteristic is by main iron core 1 and 2, auxiliary iron core 3, secondary winding W
2, auxiliary winding W
C1, W
C2, field winding W
aWith compensation winding W
bForm, on main iron core 1, be wound with auxiliary winding W
C1, on main iron core 2, be wound with auxiliary winding W
C2, auxiliary winding W
C1And W
C2Homopolar end the top is connected, in addition two ends respectively with field winding W
aTwo ends connect, on auxiliary iron core 3, be wound with field winding W simultaneously
aWith compensation winding W
b, secondary winding W
2On main iron core 1 and 2, secondary winding W
2With compensation winding W
bSeries connection.Main iron core is divided into two and becomes two physical dimensions and equate, and the identical main iron core 1 and 2 of material, auxiliary winding W
C1And W
C2Equal turn numbers, on main iron core 1,2 and auxiliary iron core 3, the number of turn of a winding can be single-turn type or multiturn formula simultaneously for winding, a winding does not omit in Fig. 3 to be drawn, compensation winding W
bThe magnetic that is used for regulating auxiliary iron core 3 is close, field winding W
aGive auxiliary winding W
C1And W
C2One exciting curent is provided, thereby makes the permeability of main iron core 1 and 2 greatly improve the error that reduces current transformer, accuracy can improve one or two grade like this.
Advantage of the present invention is: manufacturing process is simple, debugging is convenient, applied range.It can be excitatory separately, improves the permeability of current transformer core, promptly need not increase the error that comparatively complicated compensating element, just can reduce current transformer, realizes improving one or two grade of current transformer precision.The compensation method of adopting the present invention to use is not only applicable to make all kinds of current transformers, and is applicable to all kinds of voltage transformers of manufacturing.
Embodiments of the invention:
Its schematic circuit is produced 0.2 grade current transformer as shown in Figure 3, current ratio 150A/5A, and secondary load 5VA, main iron core 1 and 2 physical dimension equate that material is identical, promptly main iron core 1 and 2 is of a size of φ 45/ φ 60 * 30; Material is 0.35 millimeter a silicon steel sheet, and auxiliary iron core 3 is of a size of φ 65/ φ 70 * 50, and material also is 0.35 millimeter a silicon iron plate; Winding W
2And W
bUse the lead coiling of Φ 1.56 respectively; Winding W
C1, W
C2And W
aUse the lead coiling of φ 0.96 respectively; Each umber of turn is as follows:
W
2=30 circles; W
b=15 circles; W
a=25 circles; W
C1=W
C2=33 circles.
Claims (3)
1, a kind of high permeance current transformer mainly comprises iron core 1 and 2, auxiliary iron core 3, winding, secondary winding W
2, auxiliary winding W
C1, W
C2, field winding W
aWith compensation winding W
bForm, it is characterized in that on main iron core 1, being wound with auxiliary winding W
C1, on main iron core 2, be wound with auxiliary winding W
C2, auxiliary winding W
C1With auxiliary winding W
C2Homopolar end the top is connected, in addition two ends respectively with field winding W
aTwo ends connect, on auxiliary iron core 3, be wound with field winding W simultaneously
aWith compensation winding W
b, secondary winding W
2On main iron core 1 and 2, secondary winding W
2With compensation winding W
bSeries connection, a winding while, the number of turn of a winding can be single-turn type or multiturn formula on main iron core 1,2 and auxiliary iron core 3.
2, the current transformer of high permeance according to claim 1 it is characterized in that the physical dimension of described main iron core 1 and 2 equates, and material is identical.
3, the current transformer of high permeance according to claim 1 is characterized in that described auxiliary winding W
C1And W
C2The number of turn identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90106748 CN1020520C (en) | 1990-08-02 | 1990-08-02 | High permeance current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90106748 CN1020520C (en) | 1990-08-02 | 1990-08-02 | High permeance current transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1048627A CN1048627A (en) | 1991-01-16 |
| CN1020520C true CN1020520C (en) | 1993-05-05 |
Family
ID=4880244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90106748 Expired - Fee Related CN1020520C (en) | 1990-08-02 | 1990-08-02 | High permeance current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1020520C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103854841A (en) * | 2012-12-06 | 2014-06-11 | 上海浦东金盛互感器厂 | Error compensation method for current transformer capable of being accompanied by direct current |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360885A (en) * | 2011-07-07 | 2012-02-22 | 张逢春 | Combined current transformer |
| CN102709042B (en) * | 2012-06-21 | 2015-06-10 | 陈德才 | Current transformer |
| CN104505243B (en) * | 2014-09-22 | 2015-12-02 | 秦喜昌 | 0.001 grade of high pressure high accuracy double-stage voltage transformer development and application |
| CN104849532B (en) * | 2015-06-09 | 2020-01-17 | 中国电力科学研究院 | Precise current sensor |
| CN107170571B (en) * | 2017-06-07 | 2020-02-07 | 中国电力科学研究院有限公司 | Multi-stage voltage transformer |
| CN107424815B (en) * | 2017-08-18 | 2019-04-30 | 陈宇斯 | A kind of two-stage current transformer compensated using circle is subtracted |
-
1990
- 1990-08-02 CN CN 90106748 patent/CN1020520C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103854841A (en) * | 2012-12-06 | 2014-06-11 | 上海浦东金盛互感器厂 | Error compensation method for current transformer capable of being accompanied by direct current |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1048627A (en) | 1991-01-16 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |