CN201242590Y - Measuring head for DC high-current calibrating equipment - Google Patents
Measuring head for DC high-current calibrating equipment Download PDFInfo
- Publication number
- CN201242590Y CN201242590Y CNU2008200812771U CN200820081277U CN201242590Y CN 201242590 Y CN201242590 Y CN 201242590Y CN U2008200812771 U CNU2008200812771 U CN U2008200812771U CN 200820081277 U CN200820081277 U CN 200820081277U CN 201242590 Y CN201242590 Y CN 201242590Y
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- measuring head
- modulating
- winding
- current
- periphery
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Abstract
The utility model relates to a measuring head in a high direct current calibrating device. The measuring head is composed of two modulating and detecting iron cores, two modulating and detecting windings, an electrostatic screen, a magnetic shield, a secondary winding and a primary winding; wherein the modulating and detecting windings are arranged on the periphery of the modulating and detecting iron cores, the electrostatic screen is arranged on the periphery of the two modulating and detecting iron cores, and the magnetic shield, the secondary winding and the primary winding are arranged on the periphery of the electrostatic screen in sequence. The measuring head is mainly used for on-line testing devices which require high current above 600 A and voltage calibration, such as a uniform current and voltage experimental bench and an electrical motor load experimental bench. The measuring head ensures the testing device to be free from excitation loss and eccentric effects; the maximum allowable error is controlled within the range of 0.05%, so as to ensure the accuracy of the testing device; and the measurement values are accurate and reliable, thus meeting the requirements for the calibration of the electric current load experimental bench, the uniform current and voltage experimental bench and the battery charging and discharging device.
Description
Technical field
The utility model relates to the measuring head in the real testing equipment on-line calibration of the D.C. high-current device of railway special use.
Background technology
There are many special purpose test equipments in the railway system, and the operating mode when needing each electric component of simulation normally to move in the use is measured its parameters then, thereby judged whether it satisfies request for utilization.This just relates to large direct current measuring, and the large direct current measuring device that these testing equipments use uses in production environment for a long time, and parameter can change, and makes pointing accuracy worse and worse, causes the reliability of product testing quality to reduce.
Want the accurate of warranty test data, just must the heavy-current measuring device of these testing equipments regularly be detected.The structure of measuring head is again vital in to the heavy-current measuring device of these testing equipments.
Summary of the invention
The purpose of this utility model provides a kind ofly can carry out measuring head in the big correcting current device of railway special DC of reliable online detection to the D.C. high-current testing equipment of the railway system (as equal flow table, motor load testing table, accumulator activation instrument, measuring battery instrument etc.).
Measuring head structure of the present utility model is: be made of two modulation detection iron cores and modulation detection winding, electrostatic screening, magnetic shielding, secondary winding and elementary winding; Modulation detection iron core periphery is the modulation detection winding, is with electrostatic screening outside two modulation detection iron cores, and the electrostatic screening periphery is magnetic shielding, secondary winding and elementary winding successively.
The high magnetic permeability soft magnetic material annular core of two magnetic properties and geometric parameters number average symmetry, be wound with the detection winding of the identical number of turn, two be wound with the overlapping placement of iron core that detects winding after, two are detected the winding differential concatenation, (inside and outside, upper and lower) wrapped up by the magnetic shielding iron core around last, around last secondary winding and elementary winding, provide pumping signal by modulating oscillator after two detection winding differential concatenations, make two iron cores just enter state of saturation.
Measuring head of the present utility model is mainly used in current-sharing and all presses testing table, motor load testing table etc. to need in the on-line measuring device of above big electric current of 600A and voltage check.Make pick-up unit not have loss of excitation and Influence from Eccentric, the limits of error can be controlled in 5/10000ths scopes, make pick-up unit have good accuracy, the repeatedly experiment of carrying out through the scene shows, numerical value has satisfied the requirement of all pressing testing table, three kinds of testing equipments of accumulator cell charging and discharging equipment to calibrate to current capacity testing table, current-sharing accurately and reliably.
Description of drawings
Fig. 1 is a measuring head section of structure of the present utility model.
Among the figure, 1-modulation detection iron core, 2-modulation detection winding, 3-electrostatic screening, 4-magnetic shielding, 5-secondary winding, 6-elementary winding.
Embodiment
As shown in Figure 1, the measuring head structure in the railway special DC high-current detector of the present utility model is made of two modulation detection iron cores 1 and modulation detection winding 2, electrostatic screening 3, magnetic shielding 4, secondary winding 5 and elementary winding 6; Modulation detection iron core periphery is the modulation detection winding, is with electrostatic screening outside two modulation detection iron cores, and the electrostatic screening periphery is magnetic shielding, secondary winding and elementary winding successively.
The high magnetic permeability soft magnetic material annular core of two magnetic properties and geometric parameters number average symmetry, be wound with the detection winding of the identical number of turn, two be wound with the overlapping placement of iron core that detects winding after, two are detected the winding differential concatenation, (inside and outside, upper and lower) wrapped up by the magnetic shielding iron core around last, around last secondary winding and elementary winding, provide pumping signal by modulating oscillator after two detection winding differential concatenations, make two iron cores just enter state of saturation.
When not having DC current in the iron core ring, since the identical symmetry of two iron core duties, the detuner non-output signal in the pick-up unit, and the amplifier non-output signal is in the zero balance state this moment.When on the elementary winding when the DC current, that iron core is deepened is saturated, another withdraws from saturatedly, the detuner in the pick-up unit produces output signal, amplifier also produces output signal, this signal will produce I by secondary winding
2With balance I
1, make the output of detuner be tending towards zero point.
Claims (1)
1, the measuring head structure in a kind of D.C. high-current calibrating installation is characterized in that being made of two modulation detection iron cores and modulation detection winding, electrostatic screening, magnetic shielding, secondary winding and elementary winding; Modulation detection iron core periphery is the modulation detection winding, is with electrostatic screening outside two modulation detection iron cores, and the electrostatic screening periphery is magnetic shielding, secondary winding and elementary winding successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200812771U CN201242590Y (en) | 2008-05-29 | 2008-05-29 | Measuring head for DC high-current calibrating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200812771U CN201242590Y (en) | 2008-05-29 | 2008-05-29 | Measuring head for DC high-current calibrating equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201242590Y true CN201242590Y (en) | 2009-05-20 |
Family
ID=40715881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200812771U Expired - Fee Related CN201242590Y (en) | 2008-05-29 | 2008-05-29 | Measuring head for DC high-current calibrating equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201242590Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105074487A (en) * | 2013-03-08 | 2015-11-18 | 韩国标准科学研究院 | Shielding apparatus, shielding method and demagnetizing for measuring magnetic field |
-
2008
- 2008-05-29 CN CNU2008200812771U patent/CN201242590Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105074487A (en) * | 2013-03-08 | 2015-11-18 | 韩国标准科学研究院 | Shielding apparatus, shielding method and demagnetizing for measuring magnetic field |
| CN105074487B (en) * | 2013-03-08 | 2018-03-16 | 韩国标准科学研究院 | For measuring the screening arrangement, screen method and demagnetization in magnetic field |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090520 Termination date: 20120529 |