CN2221216Y - Small current high accuracy current sensor - Google Patents
Small current high accuracy current sensor Download PDFInfo
- Publication number
- CN2221216Y CN2221216Y CN 95201568 CN95201568U CN2221216Y CN 2221216 Y CN2221216 Y CN 2221216Y CN 95201568 CN95201568 CN 95201568 CN 95201568 U CN95201568 U CN 95201568U CN 2221216 Y CN2221216 Y CN 2221216Y
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- iron core
- annular
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- current sensor
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Abstract
The utility model discloses a small current high accuracy current sensor. The annular main iron core (1) of the utility model and the annular secondary iron core (2) are overlapped together, a compensation winding Na is wound around the annular main iron core (1), a compensating resistance R are connected between the both ends of the compensation winding Na, the overlapped annular main iron core (1) and the annular secondary iron core (2) are wound with a primary winding N1 and a secondary winding N2, the end head of the primary coil N1 is A and X, the end head of the secondary winding N2 is a and x, and the thickness of the overlapped two iron cores is 1.5 to 1.8 times thicker than the outside diameter of the annular iron cores. The utility model has the advantages of measurement of small current and high precision. The utility model overcomes the insufficiency of a current sensor which can measure small current.
Description
The utility model discloses a kind of current sensor of little electric current pin-point accuracy.
At present, some industries are badly in need of a kind of current sensor of little electric current pin-point accuracy, as: the very fast charged or on-line monitoring technique of electrical equipment of power system development in recent years, just need be under charged situation, the end screen current signal that obtains capacitive electric equipment (insulation system adopts the capacitance plate structure, comprises high-tension current mutual inductance gas, sleeve pipe, coupling condenser etc.) of pin-point accuracy.Existing small electric current sensor generally adopts two coils, and an annular core, the diameter of iron core improve the accuracy of sensor greater than the height of iron core by the number of turn of adding primary winding., the sensor of this structure can not satisfy the requirement of the charged or on-line monitoring technique of electric system.
The purpose of this utility model provides a kind of current sensor of little electric current pin-point accuracy of new structure.
The purpose of this utility model is achieved in that a kind of current sensor of little electric current pin-point accuracy, it is by annular main iron core, the auxilliary iron core of annular, primary winding N1, secondary coil N2, compensating coil Na, compensating resistance R forms, wherein, the auxilliary iron core of annular main iron core and annular stacks, be wound with compensating coil Na on the annular main iron core, be connected to compensating resistance R between the two ends of compensating coil Na, be wound with primary winding N1 and secondary coil N2 on the auxilliary iron core of annular main iron core that stacks and annular, the termination of primary winding N1 is A, X, the termination of secondary coil N2 is a, x, the thickness of stack back two iron cores are 1.5～1.8 times of annular core overall diameter.
The utility model has the advantages that: adopted the high annular core of two magnetoconductivities, selected compensating coil for use, and the height of two iron cores is 1.5～1.8 times of iron core diameter, under same core section, magnetic circuit is short, error is little, thereby makes current sensor described in the utility model have the little electric current of survey and the high advantage of accuracy.
Fig. 1 is the circuit theory diagrams of the utility model current sensor;
Fig. 2 is the utility model product design structural representation;
Below in conjunction with accompanying drawing structure of the present utility model is done further to discuss in detail:
Embodiment 1:
A kind of current sensor of little electric current pin-point accuracy, it is by the high annular main iron core 1 of magnetoconductivity, the auxilliary iron core 2 of the annular that magnetoconductivity is high, primary winding N1, secondary coil N2, compensating coil Na, compensating resistance R forms, be placed in the cylindrical housing, its annular main iron core 1 overall diameter is 25mm, thickness is 19mm, auxilliary iron core 2 overall diameters of annular are 25mm, thickness is 19mm, both stack, be wound with the compensating coil Na of 10 circles on the annular main iron core 1, be connected to compensating resistance R between the two ends of compensating coil Na, be wound with the primary winding N1 of 3 circles and the secondary coil N2 of 30 circles on the auxilliary iron core of annular main iron core that is superimposed and annular, the termination of primary winding N1 is A, X, the termination of secondary coil N2 is a, x, the termination is all in outside, and the thickness of stack back two iron cores is 1.52 times of annular core overall diameter.
The course of work of current sensor described in the utility model is as follows:
The end screen of the A termination capacitor type electrical equipment of current sensor primary winding, X holds ground connection; The a end of secondary coil and measurement terminal or other current measurement table of x termination multimeter, the numerical value that multimeter shows removes the pull-up resistor value, is the end screen current value of capacitive electric equipment.
Current sensor described in the utility model, wherein, also 1.5 times or 1.6 times or 1.7 times or 1.8 times of the annular core overall diameter of the thickness of stack back two iron cores, as: annular main iron core 1 overall diameter is that 20mm, thickness are 15mm, auxilliary iron core 2 overall diameters of annular are that 20mm, thickness are 15mm, primary winding N1 is 2 circles, and secondary coil N2 is 20 circles, and compensating coil Na is 5 circles; Or: annular main iron core 1 overall diameter is that 25mm, thickness are 20mm, and auxilliary iron core 2 overall diameters of annular are that 25mm, thickness are 20mm, and primary winding N1 is 2 circles, and secondary coil N2 is 20 circles, and compensating coil Na is 10 circles; Or: annular main iron core 1 overall diameter is that 23mm, thickness are 20mm, and auxilliary iron core 2 overall diameters of annular are that 23mm, thickness are 20mm, and primary winding N1 is 2 circles, and secondary coil N2 is 30 circles, and compensating coil Na is 8 circles; Or: annular main iron core 1 overall diameter is that 28mm, thickness are 25mm, and auxilliary iron core 2 overall diameters of annular are that 28mm, thickness are 25mm, and primary winding N1 is 3 circles, and secondary coil N2 is 30 circles, and compensating coil Na is 6 circles etc.
Claims (2)
1. the current sensor of a little electric current pin-point accuracy; It is characterized in that; It is by annular main iron core (1), the auxilliary iron core (2) of annular, primary winding N1, secondary coil N2, compensating coil Na, compensating resistance R forms, wherein, the auxilliary iron core (2) of annular main iron core (1) and annular stacks, be wound with compensating coil Na on the annular main iron core (1), be connected to compensating resistance R between the two ends of compensating coil Na, be wound with primary winding N1 and secondary coil N2 on the auxilliary iron core (2) of annular main iron core (1) that is superimposed and annular, the termination of primary winding N1 is A, X, the termination of secondary coil N2 is a, x, the thickness of stack back two iron cores are 1.5～1.8 times of annular core overall diameter.
2. the current sensor of little electric current pin-point accuracy as claimed in claim 1 is characterized in that: the thickness after auxilliary iron core (2) stack of annular main iron core (1) and annular is 1.6～1.7 times of annular core overall diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95201568 CN2221216Y (en) | 1995-02-06 | 1995-02-06 | Small current high accuracy current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95201568 CN2221216Y (en) | 1995-02-06 | 1995-02-06 | Small current high accuracy current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2221216Y true CN2221216Y (en) | 1996-02-28 |
Family
ID=33854971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95201568 Expired - Fee Related CN2221216Y (en) | 1995-02-06 | 1995-02-06 | Small current high accuracy current sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2221216Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1967264B (en) * | 2006-10-29 | 2011-02-16 | 长沙同庆电气信息有限公司 | Spiral hollow coil current transformer with compensating coils |
| CN102709042A (en) * | 2012-06-21 | 2012-10-03 | 陈德才 | Current transformer |
| CN104330760A (en) * | 2014-11-10 | 2015-02-04 | 国家电网公司 | Precise high-voltage current mutual inductor and error testing system and method thereof |
| CN107424815A (en) * | 2017-08-18 | 2017-12-01 | 陈宇斯 | A kind of two-stage current transformer compensated using circle is subtracted |
| CN112162157A (en) * | 2020-09-30 | 2021-01-01 | 海南电网有限责任公司电力科学研究院 | Transformer no-load loss measurement system |
-
1995
- 1995-02-06 CN CN 95201568 patent/CN2221216Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1967264B (en) * | 2006-10-29 | 2011-02-16 | 长沙同庆电气信息有限公司 | Spiral hollow coil current transformer with compensating coils |
| CN102709042A (en) * | 2012-06-21 | 2012-10-03 | 陈德才 | Current transformer |
| WO2013189297A1 (en) * | 2012-06-21 | 2013-12-27 | Chen Decai | Current transformer |
| CN102709042B (en) * | 2012-06-21 | 2015-06-10 | 陈德才 | Current transformer |
| CN104330760A (en) * | 2014-11-10 | 2015-02-04 | 国家电网公司 | Precise high-voltage current mutual inductor and error testing system and method thereof |
| CN104330760B (en) * | 2014-11-10 | 2016-09-14 | 国家电网公司 | High-tension current inductor and the error testing system and method for this transformer |
| CN107424815A (en) * | 2017-08-18 | 2017-12-01 | 陈宇斯 | A kind of two-stage current transformer compensated using circle is subtracted |
| CN107424815B (en) * | 2017-08-18 | 2019-04-30 | 陈宇斯 | A kind of two-stage current transformer compensated using circle is subtracted |
| CN112162157A (en) * | 2020-09-30 | 2021-01-01 | 海南电网有限责任公司电力科学研究院 | Transformer no-load loss measurement system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |