CN202133699U - Metal sampling resistor used for current measuring - Google Patents
Metal sampling resistor used for current measuring Download PDFInfo
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- CN202133699U CN202133699U CN201120246802U CN201120246802U CN202133699U CN 202133699 U CN202133699 U CN 202133699U CN 201120246802 U CN201120246802 U CN 201120246802U CN 201120246802 U CN201120246802 U CN 201120246802U CN 202133699 U CN202133699 U CN 202133699U
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- current measurement
- resistor body
- sampled signal
- current measuring
- cables
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Abstract
The utility model discloses a metal sampling resistor used for current measuring, comprising a resistor body and two current measuring sampled signal leading out cables, the two current measuring sampled signal leading out cables are led out from A and B sampling points on the resistor body, then the cables tightly bearing against the external surface of the resistor body are mutually tightly winded and are extended led out to an external circuit, the resistor body is shaped as a rectangle, the sampling points are arranged on an edge along the thickness direction of the resistor body, and the two leading out cables are tightly winded from a center line position between the sampling points (A, B) and the width direction of the resistor body. The metal sampling resistor can reduce influences of alternating magnetic fields and electric fields at the positions of the resistor body and the two leading out cables and surrounding the resistor body and the two leading out cables onto the current measuring sampled signals to the largest extent, thereby improving measuring precision.
Description
Technical field
The utility model relates to a kind of current measurement and uses the metal sample resistance.
Background technology
When the resistance that utilizes metallic conductor such as copper-manganese carries out current measurement or is used by the power measurement of current measurement amplification, electric energy metrical etc.; Resistance body and two current measurement sampled signal outgoing cable present positions and the alternating magnetic field that exists on every side (alternating magnetic field or other alternating magnetic field that produce like the power transformer leakage field), electric field (like the electric field under high-tension bus-bar or other) exist the current measurement sampled signal and disturb; Cause the generation and the increase of measuring error; Particularly when little electric current, low-power measurement and electric energy metrical; Because of alternating magnetic field, electric field bigger to the interference errors caused of current measurement sampled signal; And when the intensity of alternating magnetic field, electric field changes; It is to the interference of current measurement sampled signal and errors caused also can change; Therefore; When the resistance that utilizes metallic conductor such as copper-manganese carried out current measurement or used by the power measurement of current measurement amplification, electric energy metrical etc., the scope that how to improve current measurement precision or the power measurement precision of being amplified by current measurement, electric energy metrical precision and reduce the data precision variation that each measuring accuracy causes because of operation conditions change (causing variation or externally-applied magnetic field, the electric field harassing and wrecking of power transformer leakage field intensity like WV, load size variation) was vital problem.
The utility model content
The purpose of the utility model is to provide a kind of current measurement that can improve measuring accuracy to use the metal sample resistance.
The metal sample resistance is used in this current measurement that the utility model provides; Comprise resistance body and two current measurement sampled signal outgoing cables, said two current measurement sampled signal outgoing cables sampling spot A, B point from the resistance body are respectively drawn the back and are closely twined to extend each other near this external surface of resistance and draw until external circuit.
Said resistance body is a rectangle; Said sampling spot A, B point are on the edge of resistance body thickness direction, and said two current measurement sampled signal outgoing cables are amplified to the position of center line of resistance body Width from said sampling spot A, B point and begun closely to twine each other.
The utility model has reduced the current measurement errors that resistance body and two current measurement sampled signal outgoing cable present positions and the alternating magnetic field that exists, electric field cause the interference of current measurement sampled signal to greatest extent on every side, thereby has improved measuring accuracy.
Description of drawings
Fig. 1 is the structural drawing of the utility model.
Embodiment
Fig. 1 is the structural drawing of the utility model; Comprise rectangular resistance body and two current measurement sampled signal outgoing cables; A, the B sampling spot that is current measurement sampled signal outgoing cable from the resistance body thickness direction edge wherein; C, D are current measurement sampled signal exit; Two current measurement sampled signal outgoing cables are drawn the back from edge sampling spot A, the B point of resistance body thickness direction respectively and are caused near this external surface of resistance closely to twine to extend each other behind the position of center line of its Width and draw until external circuit; Dwindled so to greatest extent receive alternating magnetic field (alternating magnetic field or other alternating magnetic field that produce like the power transformer leakage field), electric field (as at the electric field under the high-tension bus-bar or other electric field) induction influence in solid space, disturbed induction area on all directions through the formed loop area of connecting of the circuit between current measurement sampled signal outgoing cable and the resistance body by current measurement sampled signal exit C, D two ends; According to Faraday's electromagnetic induction law; The interference voltage signal that produced by alternating magnetic field, influence induction also is minimum; Thereby alternating magnetic field, electric field have been reduced to greatest extent to the interference of current measurement sampled signal and the current measurement errors that causes; Thereby improved current measurement precision or the power measurement precision of amplifying, electric energy metrical precision, also correspondingly reduced the scope of the data precision variation that each measuring accuracy causes because of operation conditions change (causing variation or externally-applied magnetic field, the electric field harassing and wrecking of power transformer leakage field intensity like WV, load size variation) by current measurement.
Claims (2)
1. the metal sample resistance is used in a current measurement; Comprise resistance body and two current measurement sampled signal outgoing cables, it is characterized in that said two current measurement sampled signal outgoing cables respectively the sampling spot (A, B point) from the resistance body draw the back and closely twine to extend each other near this external surface of resistance and draw until external circuit.
2. the metal sample resistance is used in current measurement according to claim 1; It is characterized in that said resistance body is a rectangle; Said sampling spot (A, B point) is on the edge of resistance body thickness direction, and said two current measurement sampled signal outgoing cables are amplified to the position of center line of resistance body Width from said sampling spot (A, B point) and begun closely to twine each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120246802U CN202133699U (en) | 2011-07-14 | 2011-07-14 | Metal sampling resistor used for current measuring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120246802U CN202133699U (en) | 2011-07-14 | 2011-07-14 | Metal sampling resistor used for current measuring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202133699U true CN202133699U (en) | 2012-02-01 |
Family
ID=45522464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120246802U Expired - Lifetime CN202133699U (en) | 2011-07-14 | 2011-07-14 | Metal sampling resistor used for current measuring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202133699U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572626A (en) * | 2016-02-22 | 2016-05-11 | 宁波三星医疗电气股份有限公司 | Method for measuring and calculating error tolerance generated by magnetic leakage induced electromotive force |
| CN107422164A (en) * | 2017-09-01 | 2017-12-01 | 东莞市罗克韦新能源科技有限公司 | A kind of novel three-phase alternating-current is galvanically isolated sampling apparatus |
-
2011
- 2011-07-14 CN CN201120246802U patent/CN202133699U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572626A (en) * | 2016-02-22 | 2016-05-11 | 宁波三星医疗电气股份有限公司 | Method for measuring and calculating error tolerance generated by magnetic leakage induced electromotive force |
| CN105572626B (en) * | 2016-02-22 | 2018-05-15 | 宁波三星医疗电气股份有限公司 | The overproof methods of measurement and calculation of error produced by leakage field induced electromotive force |
| CN107422164A (en) * | 2017-09-01 | 2017-12-01 | 东莞市罗克韦新能源科技有限公司 | A kind of novel three-phase alternating-current is galvanically isolated sampling apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120201 |
|
| CX01 | Expiry of patent term |