CN1797007A - Method for shielding clip style sensor - Google Patents
Method for shielding clip style sensor Download PDFInfo
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- CN1797007A CN1797007A CN 200410093309 CN200410093309A CN1797007A CN 1797007 A CN1797007 A CN 1797007A CN 200410093309 CN200410093309 CN 200410093309 CN 200410093309 A CN200410093309 A CN 200410093309A CN 1797007 A CN1797007 A CN 1797007A
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- iron core
- style sensor
- clip style
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Abstract
The invention relates to a clamp sensor screening method, characterized in adopting at least two screening layers. And the clamp sensor comprises a probe casing and an iron core, where the iron core is arranged in the probe casing, and it is characterized in that at least two screening layers are arranged between the iron core, that the probe casing, each screening layer corresponds to a different or the same ground, and that a filling silica gel is arranged between the screening layers. The advantage lies in that the invention can measure weak electric signals.
Description
Technical field
The present invention relates to a kind of screen method of clip style sensor, can detect the low electric current that reaches 1mA, can follow the tracks of the waveform of the tested electric current of the true reflection of output, can be applicable to carry out the occasion of noncontact current/voltage signal testing, belong to sensor technical field.
Background technology
Traditional clip style sensor is made up of iron core, shell at present, and it has following shortcoming:
1. what this sensor probe adopted is the direct-coupled method of iron core, without screen layer or only use one deck screen layer, so very easily be subjected to the interference of external electromagnetic field, the serious distortion of the waveform of sensing when measuring feeble signal;
2. traditional split-core type meter jaw iron core uses silicon steel material, because the density of siliconized plate is bigger, and the antisaturation poor performance, its Effective permeability value is low, and the split-core type meter of making like this is heavier, and measuring accuracy also is subjected to certain influence;
3. traditional sensor jaw adopts mechanical parts fixedly to aim at iron core more, adopts the tangent plane goodness of fit of this mode iron core to be subjected to certain influence, after long-time the use, can produce distortion, influences transmission performance;
4. traditional sensor jaw is round, and round jaw inconvenience is measured on the flat lead than broad.
Summary of the invention
The purpose of this invention is to provide a kind of can be in the external world dried screen method of measuring the clip style sensor of little electric quantity signal under the environment of scratching.
In order to achieve the above object, solution of the present invention provides a kind of screen method of clip style sensor, it is characterized in that, adopts the screen method of two-layer at least screen layer.
Adopt the clip style sensor of multiple shield method, comprise probe shell, iron core, iron core places in the probe shell, it is characterized in that, at least be equipped with two-layer screen layer between iron core and the probe shell outer wall, each screen layer is equipped with filling gel to similar and different ground connection should be arranged between each screen layer.
Described probe shell, iron core are oval.
Described iron core can be iron, siliconized plate, permalloy and magnetic, Ferrite Material.
Advantage of the present invention is:
1. adopt two-layer at least shield technology
Because therefore stronger electric field and the magnetic interference of extraneous existence when using at the instrument scene must add shielding measure in the iron core outside:
(1) electric field shielding uses the metallic object parcel or the isolation signals transmission line of ground connection, and metallic object can be very thin metal forming, but good ground connection must be arranged.
(2) magnetic field shielding is when field frequency is relatively lower, below 100kHz, the present invention adopts ferrimagnet such as iron, siliconized plate, permalloy etc. to carry out magnetic field shielding, the magnetic permeability of ferromagnetic material is very big, so can concentrate on its inside to the magnetic line of force passes through, the high frequency magnetic field shielding material adopts metal good conductor, for example copper, aluminium etc.When passing sheet metal, high frequency magnetic field on sheet metal, produces induction electromotive force, because the conductivity of sheet metal is very high, so produce very big eddy current, eddy current produces counter magnetic field again, cancel out each other with the former magnetic field of passing sheet metal, increased simultaneously sheet metal former magnetic field on every side again, the magnetic line of force is detoured and mistake around sheet metal.
The present invention has adopted the multiple shield method, this multiple shield layer has adopted different metal materials, wherein pure iron shielding material adopts the super electrical pure iron plate of no timeliness, the control of magnetic shielding component shaping craft precision is strict, the fit dimension precision, magnetic shielding material is handled and is adopted high-purity hydrogen annealing process or high vacuum annealing process, magnetic property is first-class, utilize their characteristics separately that magnetic field and electric field are isolated respectively, formed electric field, the multiple shield in magnetic field, can effectively shield the interference in external electrical field and magnetic field, shield effectiveness is more than 60dB, even can operate as normal in the environment of the transformer station of 500,000 bigger KV of electromagnetic interference (EMI), the waveform of sensing almost have distortion yet.
The assembly unit of radome: in advance each piece sheet material is processed according to diagram, heat-treated, install then.Splicing place of every block of sheet material will weld, so that form continuous flux path.The screened room of Gou Chenging has shield effectiveness preferably to electromagnetic field like this.
2. use the permalloy material to have good magnetic property
The present invention has adopted permalloy to do iron core, and permalloy has high initial magnetoconductivity, low-coercivity and low-loss, be about magnet steel 1/5～1/10, the magnetic property stable properties.
High vacuum annealing formula ultra-pure hydrogen annealing process is adopted in iron core thermal treatment, the iron core of working it out has high magnetoconductivity, low magnetism leakage, energy high-fidelity transmission signals, volume is little, in light weight, opposing connection uniaxial stress drag is strong, magnetic stability, the work magnetic strength is higher than magnet steel, be a times of magnet steel during 400HZ, thereby measuring accuracy improves greatly.
3. the present invention adopts the elastic silica gel material to add and is charged between each screen layer and fixes iron core, compares traditional mechanical fixation method, and jaw can better coincide, thereby has improved transmission performance, and measuring accuracy improves greatly.
4. the oval internal diameter of unique heavy caliber, overcome the shortcoming that round jaw inconvenience is measured on the flat earth lead than broad, can be suitable for the measurement of circular and flat lead simultaneously, and air gap is also little, other products of the internal diameter of same size can only measure the above electric current of ampere level, and this product can measure the electric current of 1mA.
5. the current/voltage signal of jaw secondary does not have phase differential, can guarantee the characteristic of waveform. convenient follow-up processing of circuit.
Description of drawings
Fig. 1 is the clip style sensor structural representation.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment:
The screen method of clip style sensor, the screen method of the two-layer at least screen layer of employing.
As shown in Figure 1, be a kind of clip style sensor structural representation of multilayer screen, the clip style sensor of described a kind of multilayer screen is made up of probe shell 1, iron core 2, three layers of screen layer 3.
The clip style sensor performance comparison
The table of comparisons
| Existing clip style sensor | The utility model clip style sensor | ||
| The structure contrast | 1 | Adopt siliconized plate to make iron core, magnetoconductivity is low | Make iron core with permalloy, the |
| 2 | Do not have screen layer or have only one deck shielding | Adopt the three-layer metal screen layer, and | |
| 3 | Be not oval endoporus, it is bigger to measure flat degree of lip-rounding lead air gap, influences measuring accuracy | Adopt oval endoporus, can measure circular flat degree of lip-rounding lead simultaneously | |
| The test performance contrast | 1 | The anti-extraneous dried ability of scratching, generally at 20dB between the 60dB, test result is inaccurate | The dried ability of scratching of anti-external electromagnetic is strong, can reach |
| 2 | Waveform distortion when testing little current/voltage signal | Accurately the tracking signal wave form varies truly reflects | |
| 3 | Sensitivity is low, can only survey the above current signal of 10A (same big jaw bore) | Highly sensitive, than high several orders of magnitude of existing sensors, can measure the electric current of mA level | |
Claims (4)
1. the screen method of a clip style sensor is characterized in that, adopts the screen method of two-layer at least screen layer, and each screen layer has identical or different ground connection.
2. the used clip style sensor of the screen method of a clip style sensor, comprise probe shell (1), iron core (2), iron core (2) places probe shell (1) lining, it is characterized in that, at least be equipped with two-layer screen layer (3) between iron core (2) and the probe shell outer wall (4), each screen layer (3) is equipped with filling gel (5) to similar and different ground connection (6) should be arranged between each screen layer (3).
3. clip style sensor according to claim 2 is characterized in that, described probe shell (1), iron core (2), is oval.
4. clip style sensor according to claim 2 is characterized in that, described iron core (2) can be iron, siliconized plate, permalloy and magnetic, Ferrite Material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410093309 CN1797007A (en) | 2004-12-21 | 2004-12-21 | Method for shielding clip style sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410093309 CN1797007A (en) | 2004-12-21 | 2004-12-21 | Method for shielding clip style sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1797007A true CN1797007A (en) | 2006-07-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410093309 Pending CN1797007A (en) | 2004-12-21 | 2004-12-21 | Method for shielding clip style sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1797007A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064593A (en) * | 2017-06-14 | 2017-08-18 | 电子科技大学 | A kind of electronic mutual inductor suitable for gas insulated transformer substation Super-Current Measurement |
| CN108680092A (en) * | 2018-04-27 | 2018-10-19 | 中国计量大学 | A kind of ferrite magnetostrictive displacement sensor |
-
2004
- 2004-12-21 CN CN 200410093309 patent/CN1797007A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064593A (en) * | 2017-06-14 | 2017-08-18 | 电子科技大学 | A kind of electronic mutual inductor suitable for gas insulated transformer substation Super-Current Measurement |
| CN107064593B (en) * | 2017-06-14 | 2019-05-28 | 电子科技大学 | A kind of electronic mutual inductor suitable for gas insulated transformer substation Super-Current Measurement |
| CN108680092A (en) * | 2018-04-27 | 2018-10-19 | 中国计量大学 | A kind of ferrite magnetostrictive displacement sensor |
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