CN103915247A - Single-turn high-precision current transformer - Google Patents
Single-turn high-precision current transformer Download PDFInfo
- Publication number
- CN103915247A CN103915247A CN201410169175.5A CN201410169175A CN103915247A CN 103915247 A CN103915247 A CN 103915247A CN 201410169175 A CN201410169175 A CN 201410169175A CN 103915247 A CN103915247 A CN 103915247A
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- China
- Prior art keywords
- current transformer
- current
- turn high
- secondary coils
- precision current
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- Transformers For Measuring Instruments (AREA)
Abstract
The invention relates to a single-turn high-precision current transformer. The single-turn high-precision current transformer comprises an iron core and a primary coil, and further comprises two or more secondary coils. The wire inlet ends and the wire outlet ends of the two or more secondary coils are connected in parallel, and the numbers of turns of the two or more secondary coils are equal. Due to the fact that the numbers of the turns of the two or more secondary coils are equal, the secondary current in a single-path secondary coil is reduced, the error of the single-path secondary coil is reduced, and after parallel connection, the output current is not changed while the number of the errors is reduced, and the precision of the current transformer is improved.
Description
Technical field
The present invention relates to current transformer, is the single turn high precision current transformer in a kind of detection and protection circuit specifically.
Background technology
The problem that existing bushing current transformer mainly exists is that primary current is when being less than or equal to below 100A, punching one circle, primary current and specified number of ampere turns are equivalent, owing to being subject to the restriction in space, iron core is not accomplished larger cross-section, its iron core is when primary side passes through larger electric current, be easy to saturated in advance, secondary side can not accurately reflect primary side current, when the primary side load of instrument transformer is greater than 20% when above of its rated value for a long time, because magnetic saturation appears in iron core, easily cause the minus deviation of error.When the primary side current of instrument transformer access be less than rated current 5% time, its exciting curent increases with primary current ratio, causes comparing, the relatively large deviation of angle error.In addition in use, if measuring circuit secondary load value is greater than specified secondary load resistance value, also can cause the increase of current transformer error, can only arrive 1 grade of-3 grades of left and right by the precision that general this product primary current of traditional Error Adjustment Method is less than or equal to below 100A, can not meet client's measuring requirement, and expressly provide in GB GB1208-2006, metering level must be 0.2s level or 0.5S level.
Summary of the invention
The technical problem existing in order to overcome existing bushing current transformer, object of the present invention is just to provide a kind of simple in structure, and measuring accuracy is high, the single turn high precision current transformer that error is little.
The technical solution used in the present invention is: a kind of single turn high precision current transformer, comprise iron core and primary winding, its technical characterstic is also to comprise two above secondary coils, two above secondary coils into and out of line end parallel connection.
Further, described two above secondary coil numbers of turn are identical.
Again further, the common corresponding primary winding of described two above secondary coils or respectively corresponding more than two primary winding.
Compared with prior art, advantage of the present invention is: the formula of transformer error is:
ε
i=[I
2Z
2L
csin(α+θ
0) /2πfμA
cN
2n(IN)
1] x100 %
Formula can be found out error and the secondary circuit total impedance Z of current transformer thus
2and secondary current I
2be directly proportional, with a number of turn (IN)
1be inversely proportional to, improve secondary number of turn N2 or reduce secondary current I
2can improve the precision of instrument transformer.
More than two the secondary coil number of turn is identical, and in single channel secondary coil, secondary current reduces, and single channel secondary coil error reduces, and rear output current in parallel is constant, error reduces, and has improved current transformer precision.
Brief description of the drawings
Fig. 1 is one embodiment of the invention structural representation.
In figure: iron core 1,11, primary winding 2,21, secondary coil 3,31.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Shown in Fig. 1, a kind of single turn high precision current transformer comprises iron core 1,11, primary winding 2,21 and secondary coil 3,31.Primary winding 2 and secondary coil 3 corresponding unshakable in one's determination 1 arranges, and primary winding 21 and secondary coil 31 corresponding unshakable in one's determination 11 arrange, secondary coil 3,31 into and out of line end parallel connection, the secondary coil number of turn is identical.
Claims (3)
1. a single turn high precision current transformer, comprises iron core and primary winding, it is characterized in that: also comprise two above secondary coils, two above secondary coils into and out of line end parallel connection.
2. a kind of single turn high precision current transformer according to claim 1, is characterized in that: described two above secondary coil numbers of turn are identical.
3. a kind of single turn high precision current transformer according to claim 1 and 2, is characterized in that: the common corresponding primary winding of described two above secondary coils or respectively corresponding more than two primary winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410169175.5A CN103915247A (en) | 2014-04-25 | 2014-04-25 | Single-turn high-precision current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410169175.5A CN103915247A (en) | 2014-04-25 | 2014-04-25 | Single-turn high-precision current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103915247A true CN103915247A (en) | 2014-07-09 |
Family
ID=51040856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410169175.5A Pending CN103915247A (en) | 2014-04-25 | 2014-04-25 | Single-turn high-precision current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103915247A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106098349A (en) * | 2016-08-12 | 2016-11-09 | 山东亿玛信诺电气有限公司 | Secondary side combination transformer not being afraid of open circuit and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB306117A (en) * | 1928-02-17 | 1929-09-12 | Asea Ab | Improvements in current transformers |
| CN2107705U (en) * | 1990-12-29 | 1992-06-17 | 章志桐 | Double-division type current transformer |
| CN1074780A (en) * | 1992-01-24 | 1993-07-28 | 章成铭 | Small current single turn core type current transformer |
| CN2483814Y (en) * | 2001-07-20 | 2002-03-27 | 王小军 | Current mutual inductor |
| CN202736708U (en) * | 2012-06-20 | 2013-02-13 | 四川泰克电器有限公司 | Single-turn heart-penetrating type current mutual inductor |
| CN103606449A (en) * | 2013-11-13 | 2014-02-26 | 江苏靖江互感器厂有限公司 | High-precision current transformer |
-
2014
- 2014-04-25 CN CN201410169175.5A patent/CN103915247A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB306117A (en) * | 1928-02-17 | 1929-09-12 | Asea Ab | Improvements in current transformers |
| CN2107705U (en) * | 1990-12-29 | 1992-06-17 | 章志桐 | Double-division type current transformer |
| CN1074780A (en) * | 1992-01-24 | 1993-07-28 | 章成铭 | Small current single turn core type current transformer |
| CN2483814Y (en) * | 2001-07-20 | 2002-03-27 | 王小军 | Current mutual inductor |
| CN202736708U (en) * | 2012-06-20 | 2013-02-13 | 四川泰克电器有限公司 | Single-turn heart-penetrating type current mutual inductor |
| CN103606449A (en) * | 2013-11-13 | 2014-02-26 | 江苏靖江互感器厂有限公司 | High-precision current transformer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106098349A (en) * | 2016-08-12 | 2016-11-09 | 山东亿玛信诺电气有限公司 | Secondary side combination transformer not being afraid of open circuit and preparation method thereof |
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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: 20140709 |