WO2010082115A4 - Method for measuring an electrical current - Google Patents
Method for measuring an electrical current Download PDFInfo
- Publication number
- WO2010082115A4 WO2010082115A4 PCT/IB2010/000054 IB2010000054W WO2010082115A4 WO 2010082115 A4 WO2010082115 A4 WO 2010082115A4 IB 2010000054 W IB2010000054 W IB 2010000054W WO 2010082115 A4 WO2010082115 A4 WO 2010082115A4
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- inductor
- current
- electrical
- alternative
- measuring device
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/18—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of DC into AC, e.g. with choppers
- G01R19/20—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of DC into AC, e.g. with choppers using transductors, i.e. a magnetic core transducer the saturation of which is cyclically reversed by an AC source on the secondary side
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
- G01R15/185—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core with compensation or feedback windings or interacting coils, e.g. 0-flux sensors
Abstract
A measuring method of an electrical current (li) comprising the steps of: electrically feeding with an electric alternative current (I2) one or more first coils (4) wound around an inductor (3) to generate an alternated induced magnetic field that cyclically saturate said inductor (3) from a saturation state to the saturation state with the opposite sense, said electric alternative current (I2) having a null continuous component; winding said inductor (3) with one or more second coils (5) belonging to said user electrical circuit (U) so that the current to be measured (U) generate in said inductor (3) an additional magnetic field that varies the cycle of said inductor (3) passing from a saturation state to the saturation state with opposite sense; modifying the shape of the wave of said alternative electrical current (I2) so as to keep unchanged the saturation values of the overall magnetising field of said inductor (3), said alternative electric current (I2) with modified wave shape introducing a not null continuous component proportional to the current to be measured (I1).
Claims
1. A measuring method of an electrical current (li) comprising at least the following steps;
- providing a user electrical circuit (U) through which the electrical current (U) to be measured is flowing;
- electrically feeding with an electric alternative current (I2) one or more first coils (4) wound around an inductor (3) to generate an alternated induced magnetic field that cyclically saturate said inductor (3) from a saturation state to the saturation state with the opposite sense, said electric alternative current (U) having a null continuous component when the magnetic field induced in said inductor (3) is generated exclusively by said alternative electric current (I2);
- winding said inductor (3) with one or more second coils (5) belonging to said user electrical circuit (U) so that the current to be measured (li) generate in said inductor (3) an additional magnetic field that varies the cycle of said inductor (3) passing from a saturation state to the saturation state with opposite sense;
- modifying the shape of the wave of said alternative electrical current (I2) so as to keep unchanged the average magnetisation over a cycle of the ' overall magnetising field of said inductor (3), said alternative electric current (I2) with modified wave shape introducing a not null continuous component proportional to the current to be measured (li);
- measuring said continuous component of said alternative electric current (I2).
2. Method as claimed in claim 1 , characterised in that said modification of said wave shape of said alternative electric current (I2) consists on the modification of the duty cycle of said wave shape.
3. A device for measuring an electrical current (U) flowing in a user electrical circuit (U), comprising at least one electrical commutator circuit (2) with a cyclical commutation which include an inductor (3) to be wound with said user electrical circuit (U), and at least one electric generator circuit (11) of an alternative electric current (U) flowing in one or more first coils (4) wound around said inductor (3) to generate an alternated induced magnetic field that cyclically saturate said inductor (3) from a saturation state to the saturation state with the opposite sense, said alternative electric current (I2) having a cyclical variation correspondent to said cyclical commutation of said commutator circuit (2) and having a null continuous component when said inductor (3) is fed exclusively by said generator circuit (11), and a not null continuous component when said inductor (3) is fed also by said user electrical circuit (U) in order to compensate the effect of an additional magnetic field, generated from the electrical current to be measured (li), on the values of the hysteresis cycle of the overall saturation magnetising field of said inductor (3).
4. Measuring device as claimed in claim 3, characterised in that said commutator circuit (2) comprises an extractor dipolar element (6) of said continuous component of said alternative electric current (I2) having a first pole (7) operatively connected to a first end (8) of said one or more first coils (4) wound around said inductor (3), and the second pole (9) operatively connected to a distribution point (10) of an electrical reference tension.
5. Measuring device as claimed in claim 4, characterised in that said extractor element (6) is a resistor.
6. Measuring device as claimed in claim 4 or 5, characterised in that said generator circuit (11) comprises a comparator stage (12) between the electrical reference tension value and a electrical tension level proportional to the electrical tension level of said extractor element (6), the output of said comparator stage (12) being operatively connected to the second end (14) of said one or more first coils (4).
7. Measuring device as claimed in claim 6, characterised by comprising an amplification stage (13) interposed between said comparator stage (12) and said second end (14) of said one or more first coils (4).
8. Measuring device as claimed in any of the claims from 4 to 7, characterised by comprising a low-pass filtering element (15) arranged after said extractor element (6).
9. Measuring device as claimed in any of the preceding claims, characterized by comprising means for the electrical connection to an electrical circuit of the type passive loop 4-20 mA from which it draws the necessary supply electric power.
10. Measuring device as claimed in claim 9, characterised by comprising a circuital portion (16) for storing of electric power suitable to accumulate energy when the amount of electric power supplied from said passive loop circuit is more then the electric power amount needed from said measuring device (1), and designed to supply stored electric power to said measuring device (1) when the amount of electric power supplied from said passive loop circuit is lower then the electric power amount required for the operation of said measuring device (1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITPD2009A000005A IT1392716B1 (en) | 2009-01-13 | 2009-01-13 | METHOD OF MEASUREMENT OF AN ELECTRIC CURRENT |
| ITPD2009A000005 | 2009-01-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2010082115A1 WO2010082115A1 (en) | 2010-07-22 |
| WO2010082115A4 true WO2010082115A4 (en) | 2010-09-10 |
Family
ID=41226027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2010/000054 WO2010082115A1 (en) | 2009-01-13 | 2010-01-13 | Method for measuring an electrical current |
Country Status (2)
| Country | Link |
|---|---|
| IT (1) | IT1392716B1 (en) |
| WO (1) | WO2010082115A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011002756A1 (en) | 2011-01-17 | 2012-07-19 | Sunways Ag Photovoltaic Technology | Current measuring device for detecting a current, solar inverters and method for detecting a current |
| US9128128B2 (en) | 2011-06-10 | 2015-09-08 | General Electric Company | Current sensor |
| EP2565657A1 (en) * | 2011-09-01 | 2013-03-06 | Nederlandse Organisatie voor toegepast -natuurwetenschappelijk onderzoek TNO | Apparatus for testing the interconnection of photovoltaic cells |
| US9410990B2 (en) * | 2013-03-08 | 2016-08-09 | Deere & Company | Method and sensor for sensing current in a conductor |
| US9297836B2 (en) | 2013-03-08 | 2016-03-29 | Deere & Company | Method and sensor for sensing current in a conductor |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4290018A (en) | 1979-08-22 | 1981-09-15 | Rockwell International Corporation | Magnetic field strength measuring apparatus with triangular waveform drive means |
| DE3715789A1 (en) * | 1987-05-12 | 1988-12-01 | Bosch Gmbh Robert | Electrically isolated current transformer for measuring DC and AC currents |
| US5091697A (en) | 1989-07-31 | 1992-02-25 | Ii Morrow, Inc. | Low power, high accuracy magnetometer and magnetic field strength measurement method |
| FR2734058B1 (en) | 1995-05-12 | 1997-06-20 | Thomson Csf | AMMETER |
| FR2824951B1 (en) * | 2001-05-21 | 2003-07-25 | Schneider Electric Ind Sa | DETECTION TRANSFORMER FOR DIFFERENTIAL PROTECTION DEVICE AND PROTECTION DEVICE COMPRISING SUCH A TRANSFORMER |
| US6984979B1 (en) * | 2003-02-01 | 2006-01-10 | Edel Thomas G | Measurement and control of magnetomotive force in current transformers and other magnetic bodies |
-
2009
- 2009-01-13 IT ITPD2009A000005A patent/IT1392716B1/en active
-
2010
- 2010-01-13 WO PCT/IB2010/000054 patent/WO2010082115A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| IT1392716B1 (en) | 2012-03-16 |
| WO2010082115A1 (en) | 2010-07-22 |
| ITPD20090005A1 (en) | 2010-07-14 |
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