CN1573339A - High tension current detecting method and device - Google Patents
High tension current detecting method and device Download PDFInfo
- Publication number
- CN1573339A CN1573339A CN 02109880 CN02109880A CN1573339A CN 1573339 A CN1573339 A CN 1573339A CN 02109880 CN02109880 CN 02109880 CN 02109880 A CN02109880 A CN 02109880A CN 1573339 A CN1573339 A CN 1573339A
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- Prior art keywords
- detecting method
- current detecting
- high tension
- tension current
- conductor
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a method and apparatus for high voltage and current detection, wherein sampling is directly conducted on electric conductor through optical-electrical coupling conduit or fiber-optical isolation, and the signal is transmitted to low-pressure end for dissimilar frequency current detection, and the method comprises detecting, magnification, optical-electrical separation and independent power supply.
Description
Technical field
The present invention belongs to high tension current detecting method, and is specifically a kind of in direct sample on the electric conductor and after through photoelectricity coupled conductor or optical fiber isolation, signal delivered to low pressure bring in method and the device that detects the different frequency electric current.
Background technology
At present, the method that detects electric current in electric system is more, and electromagnetic field couples detection method such as current transformer are arranged, Hall element, and photo-electricity mutual-inductor is realized indirect detection; But along with the development of electric utility, the electric pressure in its transmission course is also in continuous improve, and electric current detecting method commonly used just exists heaviness, poor stability, because magnetically saturated effect causes sensing range narrow, precision is low, production cost height, processing and many shortcomings such as installation difficulty is big.
Summary of the invention
The purpose of this invention is to provide a kind of method and device that can directly detect high-tension current, can realize that sensing range is wide, the precision height, good stability, easy operating, safe and reliable.
This method is to be made of detection, amplification, photoelectricity isolation and independent current source four parts, it is characterized in that the test section is to get A, B 2 points on electric conductor, its length Δ L is 0.5～100cm, with it as sample resistance, when electric current is flowed through electric conductor, small voltage drop U will be produced
ABSmall electric pressure drop U when flowing through conductor to obtain electric current
AB
Small electric pressure drop U when having obtained electric current and flowing through
ABAmplify through two-stage amplifier, by capacitance C
1Send the LED of isolated part, photoelectric receiving tube GD
2Receiving optical signals is converted into electric signal output.Photoelectric receiving tube GD
1The photosignal that receives is fed back to IC
2Input end, with these various drifts (temperature float, time float etc.) that suppress system, so just can guarantee the safe and stable operation of system.
Isolated part is the lighttight sealed tube by intensity height, good insulation preformance, a light emitting diode and two reception photoelectric tubes are formed, in photoconductive cell, can light emitting diode be connected with two reception photoelectric tubes with optical fiber, or do not add optical fiber and connect, and with air, logical light, transparency is good, fillings such as the gas that insulativity is high, solid, liquid.
The present invention adopts quick-magnetic saturated current transformer to provide power supply for native system, because the power supply and the low-pressure section of native system do not have any electromagnetic relationship, so its security is higher.
The given detection method of the present invention is simple, and easy operating is easy to utilize; Its pick-up unit is simple in structure, good stability, and signal obtains and the processing accuracy height, is better than existing detection method.
Description of drawings
Accompanying drawing is circuit theory diagrams of the present invention.
Embodiment
Detection principle of the present invention is based on Ohm law, Δ U=I * Δ R, and wherein I is the electric current that flows through electric conductor, and Δ U flows through the voltage drop of the electric current I of electric conductor at the AB point-to-point transmission, and U delivers to by R with Δ
1, R
2And IC
1Behind the amplifier of forming, again this amplifying signal and the signal that feeds back through photoelectric receiving tube 1 are passed through jointly by R
3, R
4And IC
2The amplifier of forming amplifies, and passes through capacitance C at last
1Deliver to the anode of LED light emitting diode, photoelectric receiving tube 2 is converted into electric signal with the light signal that receives, and delivers to single-chip microcomputer and handles, and has so just finished whole testing process.
The method difference that the present invention and other low pressure detect electric current is summarized as follows:
One, the common photoelectric coupling mechanism is adopted in the isolation of other low pressure detections more, and the dielectric voltage withstand intensity of this common photoelectric coupling mechanism is lower, is generally 5000V, so it just can not be applicable to all kinds of above electric equipment products of 1000V that surpass.And the length L of sealed tube that the present invention adopts between 0.5cm～2000cm, can change according to the height of voltage, so just can increase its withstand voltage dielectric strength.
Two, the power supply mode among the present invention is to have overlapped a quick-magnetic saturated current transformer to come for native system provides an independently power supply on high voltage bus, and this power supply and low-pressure side do not have any electromagnetic connection, so its security is higher.
Based on above 2 points, method of the present invention and other low pressure detection method have them basic different.
Claims (4)
1. high tension current detecting method is characterized in that detection method is to get A, B that length is Δ L0.5～100cm at 2 as sample resistance on conductor, the small electric pressure drop U when flowing through to obtain electric current
AB
2. the pick-up unit of a high tension current detecting method is characterized in that the small electric pressure drop U that A on the conductor, B obtain at 2
ABThrough amplifier IC
1And IC
2Two-stage is amplified, by capacitance C
1Send the interior LED of sealed tube of isolated part, photoelectric receiving tube GD
2The light signal that receives is converted into electric signal exports single-chip microcomputer to.
3. according to the described pick-up unit of claim 2, what it is characterized in that the isolated part employing is sealed tube, and its length is between 0.5cm～2000cm.
4. according to claim 2,3 described pick-up units, it is characterized in that sealed tube is by a LED and two reception photoelectric tube GD
1, GD
2Employing optical fiber connects, and also can adopt gas or solid, liquid filling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021098808A CN1321325C (en) | 2002-06-19 | 2002-06-19 | High tension current detecting method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021098808A CN1321325C (en) | 2002-06-19 | 2002-06-19 | High tension current detecting method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1573339A true CN1573339A (en) | 2005-02-02 |
| CN1321325C CN1321325C (en) | 2007-06-13 |
Family
ID=34468836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021098808A Expired - Fee Related CN1321325C (en) | 2002-06-19 | 2002-06-19 | High tension current detecting method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1321325C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009003395A1 (en) * | 2007-06-29 | 2009-01-08 | Wei Wu | A wide range and high accuracy on-line current and temperature measuring device and method |
| CN105301332A (en) * | 2015-11-27 | 2016-02-03 | 云南电网有限责任公司电力科学研究院 | High potential pulse small current signal measuring system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5979162A (en) * | 1982-10-28 | 1984-05-08 | Mitsubishi Electric Corp | Current detector |
| CN85205626U (en) * | 1985-12-30 | 1986-08-13 | 清华大学 | Sensor applying optical fiber for measuring ac/dc large current |
| JPS6325567A (en) * | 1986-07-17 | 1988-02-03 | Toshiba Corp | Optical type partial discharge detector |
| CN2086908U (en) * | 1991-01-04 | 1991-10-16 | 大连理工大学 | High-valtage current measurer |
| DE4107360A1 (en) * | 1991-03-05 | 1992-09-10 | Ver Energiewerke Ag | Measuring control current of high voltage system surge suppressor - by measuring voltage drop across low impedance measurement resistance in parallel with monitoring gap |
-
2002
- 2002-06-19 CN CNB021098808A patent/CN1321325C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009003395A1 (en) * | 2007-06-29 | 2009-01-08 | Wei Wu | A wide range and high accuracy on-line current and temperature measuring device and method |
| CN101334430B (en) * | 2007-06-29 | 2012-07-18 | 吴伟 | High accuracy electric current and temperature on-line detection device and its sampling method |
| CN105301332A (en) * | 2015-11-27 | 2016-02-03 | 云南电网有限责任公司电力科学研究院 | High potential pulse small current signal measuring system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1321325C (en) | 2007-06-13 |
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| SE01 | Entry into force of request for substantive examination | ||
| 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: 20070613 Termination date: 20100619 |