CN101614762A - High precision electric current transducer - Google Patents
High precision electric current transducer Download PDFInfo
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- CN101614762A CN101614762A CN200910060223A CN200910060223A CN101614762A CN 101614762 A CN101614762 A CN 101614762A CN 200910060223 A CN200910060223 A CN 200910060223A CN 200910060223 A CN200910060223 A CN 200910060223A CN 101614762 A CN101614762 A CN 101614762A
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- operational amplifier
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- current transformer
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Abstract
The invention discloses a kind of high precision electric current transducer, belong to technical field of electricity.It comprises current transformer, current transformer is the core-theaded type loop configuration, its former limit winding is the 1-3 circle, the secondary winding is the 5-12 circle, the secondary winding is connected with operational amplifier and pull-up resistor, the positive and negative electrode of secondary winding connects with the positive and negative electrode of operational amplifier respectively, and pull-up resistor is in parallel with the output terminal of operational amplifier.Compensation effect is obvious, carrying load ability is strong, antijamming capability is stronger, precision height, reliability height; Can be used for electrical equipments such as online monitoring Zinc-Oxide Arrester, current transformer, voltage transformer (VT), coupling condenser, capacitance type potential transformer.
Description
Affiliated technical field
The present invention relates to a kind of AC measurment current sampling device, especially power supply grid on-line monitoring current sampling device belongs to technical field of electricity.
Background technology
At present, along with the rapid increase of net capacity and improving constantly of electric pressure, the reliability of power supply has seemed more and more important, adopt conventional preventative maintenance system and non-destructive testing (NDT) to the monitoring of electrical equipment can not the adaptive state maintenance technique requirement; Need implement on-line monitoring to the duty of electrical equipment.So not only apparatus insulated running status can be reflected truly, and the loss that power failure brings can be reduced.Current sensor is the important component part of on-line monitoring system, its performance etc. directly has influence on precision and the reliability that quantity of information is obtained, particularly on-line monitoring Zinc-Oxide Arrester (MOA), current transformer (CT), voltage transformer (VT) (PT), coupling condenser (OY), capacitance type potential transformer electrical equipments such as (CVT), their leakage current is all very little, may diminish to microampere order.Require current sensor to have high precision and high reliability, existing product can not satisfy its requirement mostly.
Summary of the invention
In order to overcome the deficiency of existing current sensor, the invention provides a kind of current sensor with adaptive equalization function.
The technical solution adopted for the present invention to solve the technical problems is: high precision electric current transducer, comprise current transformer CT, current transformer CT is the core-theaded type loop configuration, its former limit winding W1 is the 1-3 circle, secondary winding W2 is the 5-12 circle, secondary winding W2 is connected with operational amplifier Z and pull-up resistor R, and the positive and negative electrode of secondary winding W2 connects with the positive and negative electrode of operational amplifier Z respectively, and pull-up resistor R is in parallel with the output terminal of operational amplifier Z.
The invention has the beneficial effects as follows that compensation effect is obvious, carrying load ability is strong, antijamming capability is stronger, precision height, reliability height; Can be used for online monitoring MOA, CT, PT, electrical equipments such as OY, CVT.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
High precision electric current transducer, comprise current transformer CT, current transformer CT is the core-theaded type loop configuration, its former limit winding W1 is the 1-3 circle, secondary winding W2 is the 5-12 circle, secondary winding W2 is connected with operational amplifier Z and pull-up resistor R, and the positive and negative electrode of secondary winding W2 connects with the positive and negative electrode of operational amplifier Z respectively, and pull-up resistor R is in parallel with the output terminal of operational amplifier Z.As Fig. 1.
Current transformer CT is the core-theaded type loop configuration, and its iron core is H80 * 60 * 25mm magnet ring, i.e. external diameter 60mm, internal diameter 25mm, thick 80mm.The specification of current transformer is H80 * 60 * 25mm-R7K.
The capacitive electric equipment that need are detected is connected in series in the elementary winding, and on-Line Voltage is U
1,, in former limit winding W1, produce leakage current I through current transformer CT
1, in secondary winding W2, produce induction current I
2, after operational amplifier Z amplifies, on pull-up resistor R, produce pressure drop U
2, with U
2Magnitude of voltage as online detected value, judge the insulating property of electrical equipment with this.
The former limit of the current transformer CT number of turn is few, and its access can not change the duty of electrical equipment, and adopts the core-theaded type loop configuration, by inserting compensating circuit at secondary, detects the magnetic potential that exciting curent produces, according to the law of electromagnetic induction with magnetic flux Ф
0Be transformed into voltage, after operational amplifier Z amplifies, in the compensation winding, produce electric current, finally, make working sensor, form the magnetic closed loop, thereby improve the carrying load ability and the conversion accuracy of sensor at the magnetic balance state with the compensation of magnetic potential form.
Realize magnetic balance by current compensation, eliminated current sensor, improved the precision of current sensor because of the error that exciting curent produces.Have that the linearity is good, the amplitude-frequency phase-frequency characteristic is good, compensation effect obviously and have stronger advantages such as antijamming capability.
Claims (2)
1, a kind of high precision electric current transducer, comprise current transformer (CT), it is characterized in that, current transformer (CT) is the core-theaded type loop configuration, its former limit winding (W1) is the 1-3 circle, and secondary winding (W2) is the 5-12 circle, and secondary winding (W2) is connected with operational amplifier (Z) and pull-up resistor (R), the positive and negative electrode of secondary winding (W2) connects with the positive and negative electrode of operational amplifier (Z) respectively, and pull-up resistor (R) is in parallel with the output terminal of operational amplifier (Z).
2, high precision electric current transducer according to claim 1 is characterized in that, described current transformer (CT) is the core-theaded type loop configuration, and its iron core is H80 * 60 * 25mm magnet ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910060223A CN101614762A (en) | 2009-08-03 | 2009-08-03 | High precision electric current transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910060223A CN101614762A (en) | 2009-08-03 | 2009-08-03 | High precision electric current transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101614762A true CN101614762A (en) | 2009-12-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910060223A Pending CN101614762A (en) | 2009-08-03 | 2009-08-03 | High precision electric current transducer |
Country Status (1)
| Country | Link |
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| CN (1) | CN101614762A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102682985A (en) * | 2012-05-16 | 2012-09-19 | 深圳市深泰明科技有限公司 | High-voltage electronic type voltage transformer |
| CN103123372A (en) * | 2011-11-21 | 2013-05-29 | 上海晨兴希姆通电子科技有限公司 | Signal acquisition unit and current detection device |
| WO2019181543A1 (en) * | 2018-03-20 | 2019-09-26 | Ntn株式会社 | Ct-type current sensor |
| CN111323632A (en) * | 2019-07-15 | 2020-06-23 | 国网江西省电力有限公司电力科学研究院 | AC/DC zero-flux fluxgate current sensor and program control configuration and calibration method thereof |
-
2009
- 2009-08-03 CN CN200910060223A patent/CN101614762A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123372A (en) * | 2011-11-21 | 2013-05-29 | 上海晨兴希姆通电子科技有限公司 | Signal acquisition unit and current detection device |
| CN102682985A (en) * | 2012-05-16 | 2012-09-19 | 深圳市深泰明科技有限公司 | High-voltage electronic type voltage transformer |
| CN102682985B (en) * | 2012-05-16 | 2015-04-22 | 深圳市深泰明科技有限公司 | High-voltage electronic type voltage transformer |
| WO2019181543A1 (en) * | 2018-03-20 | 2019-09-26 | Ntn株式会社 | Ct-type current sensor |
| CN111323632A (en) * | 2019-07-15 | 2020-06-23 | 国网江西省电力有限公司电力科学研究院 | AC/DC zero-flux fluxgate current sensor and program control configuration and calibration method thereof |
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Open date: 20091230 |