CN102103156B - Digital current transformer and method for measuring current of AC (Alternating Current) transmission conductor - Google Patents
Digital current transformer and method for measuring current of AC (Alternating Current) transmission conductor Download PDFInfo
- Publication number
- CN102103156B CN102103156B CN200910264427.1A CN200910264427A CN102103156B CN 102103156 B CN102103156 B CN 102103156B CN 200910264427 A CN200910264427 A CN 200910264427A CN 102103156 B CN102103156 B CN 102103156B
- Authority
- CN
- China
- Prior art keywords
- digital
- current
- coil
- analog
- processor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000004020 conductor Substances 0.000 title abstract 5
- 238000005070 sampling Methods 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000008054 signal transmission Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 238000005381 potential energy Methods 0.000 abstract 4
- 230000001939 inductive effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
The invention provides a digital current transformer and a method for measuring the current of an AC (Alternating Current) transmission conductor, and relates to a current detecting device and method of a power transmission line. The digital current transformer comprises a coil 1 provided with a magnetic skeleton and used for supplying power, a coil 2 provided with a nonmagnetic skeleton and used for sampling, and a current detecting circuit. The method for measuring the current of the AC transmission conductor by using the digital current transformer comprises the following steps of: 1) inducing electrical potential energy formed due to the difference of magnetic field intensities on different circumferences of the AC transmission conductor by using the coil 2, and transmitting the weak electrical potential energy signal to a sampling circuit; 2) sampling energy by using the coil 1; (3) transmitting the electrical potential energy signal amplified by an amplifier to an analog to digital converter, converting the electrical potential energy signal into a digital signal, and transmitting the digital signal to a processor, wherein a conversion program is preset in the processor, the digital signal is solved by using the processor preset with the conversion program, is converted into a current signal through a digital to analog converter, and is transmitted to a current display meter to display the current value in the AC transmission conductor.
Description
Technical field
The present invention relates to a kind of method of power transmission line current sensing means and detection electric current thereof,
Particularly relate to a kind of be similar to mutual inductor current sensing means and its detect the method for electric current.
Background technology
Domestic adopted current transformer is all adopt A/A conversion regime at present, that is primary current dress is changed to the mode of 0-5A.This mode has had the history of last 100 years, and the problem existing for this kind of current transformer is: 1, power consumption is large; 2, the steel consumed, copper material are many; 3, no-load voltage ratio relation is had; 4, can not open-circuit working; 5, transship fragile.
Especially front 2 points, at present, power consumer gets more and more, and cause the use amount of mutual inductor very big, and what no-load voltage ratio current mutual inductor needs, and could take out metering signal, that is, at each user side, also needs to reuse at least two-stage mutual inductor.The wires such as copper material used in each mutual inductor, siliconized plate, magnetic material are a lot, and these materials, cost is large on the one hand, can consume electric energy on the other hand.
Summary of the invention
The present invention is directed to above problem, under providing a kind of prerequisite guaranteeing to realize mutual inductor function, metal material utilizes few digital current transducer and measures the method for AC transmission wire electric current.
Technical scheme of the present invention is: comprise housing, the coil be arranged in housing, and described coil comprises for the coil one with magnetic skeleton of energy supply, for the coil two with non magnetic skeleton that samples and current detection circuit; Described current detection circuit comprises amplifier, analog to digital converter, processor, digital to analog converter and current values indicator gauge; Described coil two connects amplifier, provides sampling current data to amplifier; Described coil one connects amplifier, processor, digital to analog converter, current values indicator gauge and analog to digital converter, to amplifier, processor, digital to analog converter, current values indicator gauge and analog to digital converter energy supply; Described coil one and coil two are arranged in housing with one heart.
Described coil one is connected with analog to digital converter by the same amplifier of an energy supply circuit, processor, digital to analog converter, current values indicator gauge, and described energy supply circuit comprises bridge rectifier circuit, capacitor and stabilivolt, and described capacitor and stabilivolt also connect.
The method utilizing digital current transducer of the present invention to measure AC transmission wire electric current is:
1), spiral shell is adopted to respond to AC transmission wire at the difference circumferentially energy of position that formed of magnetic field strength differences, and by this faint energy of position Signal transmissions to sample circuit around the coil two on non-magnetic skeleton;
2), spiral shell is adopted to gather the induction current of AC transmission wire around the coil one on magnetic skeleton, and this electric current is supplied to amplifier, processor, digital to analog converter, current values indicator gauge and analog to digital converter, as the operating power source of amplifier, processor, digital to analog converter, current values indicator gauge and analog to digital converter through rectification, filtering;
3), energy of position signal through amplifier amplify after, be transferred to analog to digital converter, be converted to digital signal; Be transferred to processor again, in processor, preset exchange program, digital signal is resolved by the processor being preset with exchange program, and is converted into current signal by digital to analog converter, is transferred to electric current indicator gauge, the current value in display AC transmission wire.
Present invention employs another kind of mode to detect the electric current in the interchange wire of electric power transfer; Adopt one to use the coil two of non magnetic skeleton coiling to sample, utilize the energy of position under different magnetic field intensity poor, be captured in the weak voltage produced in the wire of sample coil and fall; The coil one that recycling one has very little magnetic skeleton produces larger electric energy, for being supplied to current detection circuit.The fall voltage signal that current detection circuit method is faint, and resolve this signal, eventually through exchange program, draw the current value in tested wire.Exchange program can design time budget good, also can survey by one or many formula drawing conversion.The present invention also can not utilize the figure pattern in technical scheme, and directly adopts and export analog quantity by amplifier, by drawing current value to the conversion of analog quantity.The present invention has following characteristic: 1, mutual inductor is without no-load voltage ratio, and output both can be analog quantity and also can be digital quantity; 2, current transformer is without the need to additional working power.
Principle of work of the present invention is: when current transformer primary side is by electric current, Current Transformer Secondary side induces ac voltage.When the size direct proportional linear relation of magnitude of voltage and primary current rises.Because coil winding, on a non-magnetic skeleton, can not produce magnetic saturation phenomenon, the non-constant width of this mutual inductor ranges all.Mutual inductor secondary voltage is very small to be amplified by electron-amplifier, then converts digital signal output to by A/D.
Accompanying drawing explanation
Fig. 1 is the stereographic map of Inside coil of the present invention
In figure, 1 is wire, and 2 is coils one, and 21 is output terminals of coil one, and 3 is coils two, and 31 is output terminals of coil two;
Fig. 2 is that the first of Inside coil of the present invention arranges form
Fig. 3 is that the second of Inside coil of the present invention arranges form
Fig. 4 is the schematic diagram getting energy circuit in the present invention
Fig. 5 is the schematic diagram of sample circuit in the present invention
Fig. 6 be experiment test of the present invention once, secondary current relation table.
Embodiment
The present invention as Figure 1-5, comprises housing, the coil be arranged in housing, and described coil comprises for the coil 1 with magnetic skeleton of energy supply, for the coil 23 with non magnetic skeleton that samples and current detection circuit; Described current detection circuit comprises amplifier, analog to digital converter, processor, digital to analog converter and current values indicator gauge; The output terminal 31 of described coil 23 connects amplifier, provides sampling current data to amplifier; The output terminal of described coil 1 connects amplifier, processor, digital to analog converter, current values indicator gauge and analog to digital converter by functional circuit, to amplifier, processor, digital to analog converter, current values indicator gauge and analog to digital converter energy supply; Described coil 1 and coil 23 are arranged in housing with one heart.
The same amplifier of energy supply circuit of described coil 1, processor, digital to analog converter, current values indicator gauge are connected with analog to digital converter, and described energy supply circuit comprises bridge rectifier circuit, capacitor and stabilivolt, and described capacitor and stabilivolt also connect.
Its coil 1, coil 23 are arranged with one heart, mutual inside and outside position relationship as shown in Figure 2,3, whichever interior, that outside, all can realize the present invention.
The method utilizing digital current transducer of the present invention to measure electric current in AC transmission wire 1 is:
1), spiral shell is adopted to respond to AC transmission wire at the difference circumferentially energy of position that formed of magnetic field strength differences, and by this faint energy of position Signal transmissions to sample circuit around the coil 23 on non-magnetic skeleton; Be presented as very weak current value.
2), spiral shell is adopted to gather the induction current of AC transmission wire around the coil 1 on magnetic skeleton, and this electric current is supplied to amplifier, processor, digital to analog converter, current values indicator gauge and analog to digital converter, as the operating power source of amplifier, processor, digital to analog converter, current values indicator gauge and analog to digital converter through rectification, filtering;
3), energy of position signal (very weak current value) through amplifier amplify after, be transferred to analog to digital converter, be converted to digital signal; Be transferred to processor again, in processor, preset exchange program, digital signal is resolved by the processor being preset with exchange program, and is converted into current signal by digital to analog converter, is transferred to electric current indicator gauge, the current value in display AC transmission wire.
Meaning of the present invention is: 1, save copper material, steel in a large number, and copper material only uses 30% of traditional mutual inductor copper material, and steel only use 40% of traditional mutual inductor; 2, physical quantity no distortion digital transmission, the long-distance transmissions of physical quantity.3, mutual inductor is provided for realizing digital transformer substation.
The invention process target is: 1, electric pressure is 10kV and 400V; 2, carry out gathering after current measurement signal converts voltage to and carry out digital transmission; 3, modulating output or numeral output can be carried out; 4, good insulation preformance; 5, lightweight, only have about 1/2nd of traditional mutual inductor weight; 6, broad quantum can reach 0-1000A; 7, transmit undistorted.
Experimental conditions explanation
The 10kV/400V current transformer designed should be similar with the current transformer originally used in physical dimension, the current transformer that directly can substitute existing use uses, and power consumption is little, guarantee long-time steady operation, signals collecting should ensure there is precision, Signal transmissions will ensure undistorted, and signal exports should adopt digital output port, and transmission range can adapt to onsite application requirement.
Performance requirement
1, range 0-1000A
2. precision 1-0.5 level
3, operating voltage 3.3V
4, working temperature-25 DEG C ~+55 DEG C
5, power consumption 50mW
6, digital quantity transmission, transmission range 4km
7, relative humidity < 93%
8, the withstand voltage 2000V of 400V mutual inductor
9, the withstand voltage 48kV of 10kV mutual inductor
10, copper material 70% can be saved, saving steel 60%
11, overload capacity 200%
12, operation of current transformers safety, is not afraid of open circuit and short circuit.
Experimental result as shown in Figure 6.
Claims (1)
1. a digital current transducer, comprises housing, the coil be arranged in housing, it is characterized in that, described coil comprises for the coil one with magnetic skeleton of energy supply, for the coil two with non magnetic skeleton that samples and current detection circuit; Described current detection circuit comprises amplifier, analog to digital converter, processor, digital to analog converter and current values indicator gauge; Described coil two connects amplifier, provides sampling current data to amplifier; Described coil one connects amplifier, processor, digital to analog converter, current values indicator gauge and analog to digital converter, to amplifier, processor, digital to analog converter, current values indicator gauge and analog to digital converter energy supply; Described coil one and coil two are arranged in housing with one heart in inside and outside position relationship each other.
2. a kind of digital current transducer according to claim 1, it is characterized in that, described coil one is connected with analog to digital converter by the same amplifier of an energy supply circuit, processor, digital to analog converter, current values indicator gauge, described energy supply circuit comprises bridge rectifier circuit, capacitor and stabilivolt, and described capacitor and stabilivolt also connect.
3. utilize digital current transducer described in claim 1 to measure a method for AC transmission wire electric current, it is characterized in that,
1), adopt spiral shell around the coil two on non-magnetic skeleton respond to AC transmission wire difference circumferentially magnetic field strength differences formed energy of position, and by this faint energy of position Signal transmissions give described amplifier, sampling current data;
2), spiral shell is adopted to gather the induction current of AC transmission wire around the coil one on magnetic skeleton, and this electric current is supplied to amplifier, processor, digital to analog converter, current values indicator gauge and analog to digital converter, as the operating power source of amplifier, processor, digital to analog converter, current values indicator gauge and analog to digital converter through rectification, filtering;
3), energy of position signal through amplifier amplify after, be transferred to analog to digital converter, be converted to digital signal; Be transferred to processor again, in processor, preset exchange program, digital signal is resolved by the processor being preset with exchange program, and is converted into current signal by digital to analog converter, is transferred to current values indicator gauge, the current value in display AC transmission wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910264427.1A CN102103156B (en) | 2009-12-22 | 2009-12-22 | Digital current transformer and method for measuring current of AC (Alternating Current) transmission conductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910264427.1A CN102103156B (en) | 2009-12-22 | 2009-12-22 | Digital current transformer and method for measuring current of AC (Alternating Current) transmission conductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102103156A CN102103156A (en) | 2011-06-22 |
| CN102103156B true CN102103156B (en) | 2015-01-28 |
Family
ID=44156083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910264427.1A Active CN102103156B (en) | 2009-12-22 | 2009-12-22 | Digital current transformer and method for measuring current of AC (Alternating Current) transmission conductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102103156B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101775A (en) * | 2013-04-02 | 2014-10-15 | 优利德科技(中国)有限公司 | Current measuring circuit |
| CN104950155B (en) * | 2014-03-25 | 2019-03-15 | 利思电气（上海）有限公司 | A kind of self-powered type high-precision active electric current sensor |
| CN111679115A (en) * | 2020-06-10 | 2020-09-18 | 中国南方电网有限责任公司超高压输电公司大理局 | Detection method for working states of sensors of pincerlike ammeter and valve water cooling equipment |
-
2009
- 2009-12-22 CN CN200910264427.1A patent/CN102103156B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102103156A (en) | 2011-06-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101271129B (en) | Sensor type high tension electricity energy gauging method | |
| CN105182060A (en) | Self-power distributed wireless current sensor | |
| CN102103156B (en) | Digital current transformer and method for measuring current of AC (Alternating Current) transmission conductor | |
| CN102253270A (en) | Electronic AC (Alternating Current) nanovoltmeter | |
| CN102401855A (en) | Electric digital instrument using Rogowski coil current transformer | |
| CN104851581B (en) | A kind of high accuracy number amount output electronic current mutual inductor | |
| CN111198297A (en) | Signal acquisition device based on Rogowski coil and zero-flux current sensor | |
| CN102519632B (en) | Four-hole site coil integral force transducer based on principle of piezomagnetic effect | |
| CN102739066B (en) | Inductive current-to-voltage converter and method for measuring high frequency current | |
| CN201281729Y (en) | Grounding resistance tester | |
| CN104251929A (en) | Self-supplying current measuring device | |
| CN106653339B (en) | Current transformer | |
| CN203204135U (en) | U type single magnetic core magnetic flux gate probe | |
| CN108802467B (en) | Iron core coil type current transformer with high detection precision and electric leakage detection device | |
| CN101221199B (en) | Equipotential high-tension electric energy measuring apparatus of authigenic power supply | |
| CN110286293A (en) | A kind of self-energizing electric leakage monitoring method and system based on leakage current | |
| CN203069683U (en) | Online transformer transformation ratio testing device | |
| CN201434883Y (en) | Rogowski coil electric quantity transducer | |
| CN109030570A (en) | A kind of Single probe cotton measurement of water ratio electrode | |
| CN201615920U (en) | Alternating current milliammeter | |
| CN201601017U (en) | Current transformer | |
| CN110231373B (en) | Detection method and detection device for transformer winding material | |
| CN203688611U (en) | Induction type 20kHz current meter | |
| CN202133704U (en) | Electric AC nano-voltmeter | |
| CN207528797U (en) | A kind of cable shaft earth current test device of more opening joint testing currents |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: YANGZHOU POWER SUPPLY CO., JIANGSU PROV ELECTRIC P Effective date: 20121109 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20121109 Address after: 225801 members of the Baoying province Jiangsu County Road No. 288 Applicant after: Baoying County Power Supply Company of Jiangsu Electric Power Company Applicant after: Yangzhou Power Supply Company of Jiangsu Electric Power Company Applicant after: Jiangsu Electric Power Company Applicant after: State Grid Corporation of China Address before: 225801 members of the Baoying province Jiangsu County Road No. 288 Applicant before: Baoying County Power Supply Company of Jiangsu Electric Power Company |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |