CN201522523U - Zero-temperature-drift current sensor - Google Patents
Zero-temperature-drift current sensor Download PDFInfo
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- CN201522523U CN201522523U CN2009201753455U CN200920175345U CN201522523U CN 201522523 U CN201522523 U CN 201522523U CN 2009201753455 U CN2009201753455 U CN 2009201753455U CN 200920175345 U CN200920175345 U CN 200920175345U CN 201522523 U CN201522523 U CN 201522523U
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Abstract
The utility model discloses a zero-temperature-drift current sensor comprising a magnetic core and enamelled wires, wherein the magnetic core is formed by a plurality of magnetic cores with different relations between magnetic performance and temperature, wherein each magnetic core is wound with the enamelled wires with certain number of turns so as to form a magnetic core coil; the magnetic core coils are connected in parallel; and by the mutual offset of the magnetic performances among different magnetic cores on the influence of temperature, the physical performance of a current sensor is guaranteed to be not changed along with the temperature in the range of working temperature. The zero-temperature-drift current sensor applies magnetic alloys with different temperature characteristics for mutual compensation, achieves the purpose of reducing, even eliminating the problem of distortion of the sampling information of the current sensor caused by temperature by mutual offset of respective magnetic performance on temperature change, and improves the accuracy of sampling information of the current sensor.
Description
Technical field
The utility model relates on a kind of end screen ground wire that is fit to be installed in electric system high voltage appearance equipment, and ground current is carried out undistorted electric current transmitted sensor
Background technology
The screen ground, end of high voltage electric equipment is very little to electric current, is 110,000 volts for an electric pressure for example, and electric capacity is the equipment of 100pf, and its electric current is 2mA.But end screen electric current has comprised the status information of the relevant insulating property of relevant high voltage installation, and the understanding to the relevant insulating property of high voltage installation mainly is by the analysis of end screen electric current is carried out at present.To accurately understand the running status of high-tension apparatus, the extraction of current signal is very crucial, has only at first to obtain true, exact current signal, and follow-up link just has the basis, therefore, current sensor is a key link power equipment equipment being implemented status monitoring.Current sensor is being undertaken the task of signal extraction, but it is in again in the strong-electromagnetic field environment, is subjected to electromagnetic interference (EMI) easily, and long-term work is subject to the influence of atmospheric conditions such as temperature, humidity out of doors again simultaneously.The current sensor physical property is with variation of temperature, the change of the suffered stress of sensor that temperature variation is brought, all can give sensor truly acquired signal bring many uncertain factors.It is very big to be operated in the outdoor residing changes in environmental conditions of current sensor, for example, environment temperature can by subzero-40 ℃ change to+65 ℃, so significantly the variation of the sensor physical property brought of temperature variation is very large, and the variation of physical property will inevitably be reflected to the current signal that sensor is gathered, and so just inevitably causes the distortion of the status information that it is monitored.Statistical results show, cause the variation of the monitoring information of generation owing to temperature variation, near worsen the variation that is produced owing to insulating property, so the information distortion that brings of temperature variation has badly influenced the validity (Zhu Deheng to the high voltage installation state estimation, Tan Kexiong, the status and prospects of electrical equipment status monitoring and fault diagnosis technology, second national electrical equipment status monitoring and fault diagnosis technology symposial).The influence how objective, that the eliminating temperature variation of science is produced is a prerequisite of accurately obtaining time of day information.
Current sensor all is to adopt the magnetically soft alloy of high magnetic permeability to make magnetic core at present, and the enameled wire of the certain number of turn of coiling is finished on magnetic core, because the magnetic property of magnetically soft alloy changes with variation of temperature, this is the essential reason that produces the sample information distortion.Because the magnetic property of all magnetically soft alloys all is the function of temperature, be not reach the purpose of eliminating temperature effect by changing alloy species, therefore can not eliminate the situation of the sample information distortion of current sensor.
The utility model content
At the problem that prior art exists, the current sensor that the utility model provides a kind of physical property not change with variation of temperature.
For achieving the above object, a kind of zero temp shift current sensor of the utility model, comprise magnetic core and enameled wire, described magnetic core is that a plurality of magnetic properties constitute with the magnetic core that temperature is different relations, after wherein the enameled wire of the certain number of turn of coiling is formed magnetic core coil on each magnetic core, the parallel connection between the described magnetic core coil, by to magnetic property between the different magnetic cores to the cancelling out each other of temperature effect, guarantee the current sensor physical property in operating temperature range not with temperature change.
Further, described magnetic core is made of with the magnetically soft alloy B that variation of temperature is inverse relation with the magnetically soft alloy A and the magnetic permeability of the proportional relation of variation of temperature jointly magnetic permeability.
Further, described magnetically soft alloy A is a permalloy, and described magnetically soft alloy B is a bazar metal.
Further, the coil turn that twines on the described permalloy is 1000, and the coil turn that twines on the described bazar metal is the 900-1000 circle.
Further, the physical property of described current sensor comprises the current transfer ratio of described magnetic core coil and differs.
Further, described operating temperature range is 0-50 ℃.
Zero temp shift current sensor of the present utility model, the magnetic alloy that application has the different temperatures characteristic compensates mutually, by cancelling out each other that magnetic property relative temperature separately changes, reach and reduce even eliminate temperature and bring the problem of current sensor sample information distortion, improved the accuracy of current sensor sample information.
Description of drawings
Fig. 1 is the structural representation of the utility model zero temp shift current sensor;
Fig. 2 a is that perm alloy coil current transfer ratio varies with temperature curve among the utility model embodiment;
Fig. 2 b is that perm alloy coil secondary current differs with respect to primary current and varies with temperature curve among the utility model embodiment;
Fig. 3 a is that bazar metal coil current transfer ratio varies with temperature curve among the utility model embodiment;
Fig. 3 b is that bazar metal coil secondary current differs with respect to primary current and varies with temperature curve among the utility model embodiment;
Fig. 4 a is that the utility model twin coil current transfer ratio of using in parallel varies with temperature curve map;
Fig. 4 b is that the utility model twin coil secondary current that uses in parallel differs with respect to primary current and varies with temperature curve map.
Embodiment
As shown in Figure 1, zero temp shift current sensor of the present utility model, use two kinds of magnetically soft alloy A and B, their magnetic property has different temperatures coefficient, wherein the magnetic property of A alloy 1 is with the proportional relation of variation of temperature, the magnetic property of B alloy 2 is inverse relation with variation of temperature, on two kinds of magnetically soft alloy A and the B respectively around on the enameled wire of certain number of turn constitute magnetic core coil, and with two kinds of in parallel uses of magnetic core coil that alloy is made, by cancelling out each other to temperature effect, reach the current sensor physical property is not acted upon by temperature changes, do not vary with temperature and the purpose that changes.In the present embodiment, A alloy 1 adopts permalloy J79, and what B alloy 2 adopted is a kind of novel magnetically soft alloy, bazar metal.Adopt conventional coil winding technology, use two kinds of alloy coiled magnetic core coils respectively, wherein the coil turn of permalloy is 1000 circles, and the number of turn of bazar metal then requires (being generally 900 circles-1100 circle), the number of turn that coiling is suitable according to temperature compensation.Be respectively the current transfer ratio of two coils and differ (secondary current is with respect to the phase differential of primary current) temperature variant curve as Fig. 2 a-Fig. 3 b, demonstrate both and vary with temperature opposite variation tendency, form the effect of compensation mutually.As long as the turn ratio of suitable adjustable two coils in technology when carrying out the parallel connection use, can reach extraordinary compensation effect.As shown in Figs. 4a and 4b is that two coils from parallel connection of coils use after-current sensor magnetic property to vary with temperature curve, and in 0 ℃～50 ℃ temperature ranges, coil reaches zero temp shift.
The utility model current sensor, adopt two kinds of magnetic properties to vary with temperature the magnetically soft alloy of different variation tendencies, turn to the parallel connection of magnetic core coil respectively, by cancelling out each other that magnetic property relative temperature separately changes, reach the elimination temperature and bring the problem of current sensor sample information distortion, improved the accuracy of current sensor sample information.
Claims (3)
1. zero temp shift current sensor, comprise magnetic core and enameled wire, it is characterized in that, described magnetic core is that a plurality of magnetic properties constitute with the magnetic core that temperature is different relations, after wherein the enameled wire of the certain number of turn of coiling is formed magnetic core coil on each magnetic core, the parallel connection between the described magnetic core coil, by to magnetic property between the different magnetic cores to the cancelling out each other of temperature effect, guarantee the current sensor physical property in operating temperature range not with temperature change.
2. zero temp shift current sensor as claimed in claim 1 is characterized in that, described magnetic core is made of with the magnetically soft alloy B that variation of temperature is inverse relation with the magnetically soft alloy A and the magnetic permeability of the proportional relation of variation of temperature jointly magnetic permeability.
3. zero temp shift current sensor as claimed in claim 2 is characterized in that, described magnetically soft alloy A is a permalloy, and described magnetically soft alloy B is a bazar metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201753455U CN201522523U (en) | 2008-12-24 | 2009-08-26 | Zero-temperature-drift current sensor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820233660.4 | 2008-12-24 | ||
| CN2009201753455U CN201522523U (en) | 2008-12-24 | 2009-08-26 | Zero-temperature-drift current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201522523U true CN201522523U (en) | 2010-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201753455U Expired - Fee Related CN201522523U (en) | 2008-12-24 | 2009-08-26 | Zero-temperature-drift current sensor |
Country Status (1)
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| CN (1) | CN201522523U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444513A (en) * | 2018-12-05 | 2019-03-08 | 三峡大学 | A kind of bimag Low Drift Temperature Hall current sensor |
| CN111065881A (en) * | 2017-09-06 | 2020-04-24 | 株式会社村田制作所 | Displacement detection device |
| CN116754820A (en) * | 2023-08-24 | 2023-09-15 | 冰零智能科技(常州)有限公司 | Current detection system and detection method thereof |
-
2009
- 2009-08-26 CN CN2009201753455U patent/CN201522523U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111065881A (en) * | 2017-09-06 | 2020-04-24 | 株式会社村田制作所 | Displacement detection device |
| CN109444513A (en) * | 2018-12-05 | 2019-03-08 | 三峡大学 | A kind of bimag Low Drift Temperature Hall current sensor |
| CN116754820A (en) * | 2023-08-24 | 2023-09-15 | 冰零智能科技(常州)有限公司 | Current detection system and detection method thereof |
| CN116754820B (en) * | 2023-08-24 | 2023-10-24 | 冰零智能科技(常州)有限公司 | Current detection system and detection method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100707 Termination date: 20170826 |