CN103018703B - Current/voltage conversion traceability method for precision alternating current measurement - Google Patents
Current/voltage conversion traceability method for precision alternating current measurement Download PDFInfo
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Abstract
The invention discloses a current/voltage conversion traceability method for precision alternating current measurement. The method comprises (1) enabling an alternating current voltage-stabilizing source to be input to an alternating voltage proportion standard with known proportional error Eu to perform voltage/voltage proportion conversion, and obtaining standard voltage; (2) enabling the alternating current voltage-stabilizing source to be connected to a voltage type standard resistor with known resistance error Eru, and obtaining standard current; (3) inputting the obtained standard current to a current/voltage converter, performing corresponding current/voltage proportional conversion according to the standard current, and obtaining the converted voltage; (4) comparing the converted voltage with the standard voltage to obtain errors, and using the alternating voltage proportion standard and the voltage type standard resistor to correct the current/voltage converter, namely enabling the proportional conversion accuracy of current/voltage conversion to be traced to the alternating voltage proportion standard and the voltage type standard resistor. According to the current/voltage conversion traceability method, the current/voltage conversion traceability accuracy can be improved.
Description
Technical field
The present invention relates to magnitude tracing technology, be specifically related to the source tracing method of a kind of current/voltage for accurate ac current measurement conversion.
Background technology
Due to needs that are industrial and scientific research, accurate ac current measurement tracing technology is more and more paid attention to recently.As everyone knows, the measurement of electric current be based upon voltage measurement basis on, being voltage (current/voltage conversion) by current transformation, carrying out indirect inspection electric current by measuring this voltage.In addition, because the alternating current scope in real work is very wide, as common 0.002A-100A, and surveying instrument ensures that the input range of accuracy is limited, so need big current or small area analysis to be converted to suitable fixed current value, then carry out current/voltage conversion with the calibration resistor of a fixed resistance value; Or adopt the calibration resistor of multiple different resistance, directly current/voltage-converted is carried out to the alternating current in measurement range.At present, be widely used in the alternating current metering reference instrument of industry, metering, scientific research and power test research department, its uncertainty of measurement index is generally at about 100ppm, and the uncertainty of measurement of the ac current measurement standard of national laboratory generally can reach about 15 ~ 30ppm.Tracing to the source of existing ac current measurement accuracy mainly contains following two kinds of technical methods:
One, measuring resistance method
As shown in Figure 5, when electric current is by resistance, resistance two ends can produce voltage drop, if known and this voltage range of resistance can directly be measured, just can be measured and calibrate electric current by Ohm law I=U/R, which achieves current/voltage and convert.With the current measurement that the method is limit wide amount, then need multiple calibration resistor.When electric current is by resistance, the power W=I that resistance consumes
2r, if practical measurement requirement 0.8V voltage, the resistance then measuring the measuring resistance of 100A electric current should be 0.008 Ω, then now the power consumption of measuring resistance will reach W=80W, so the power capacity measuring the measuring resistance of big current is enough large, usual employing combined electrical flow pattern calibration resistor, the accurate shunt of the A40B type as FLUKE company of the U.S., to meet the requirement of certain power consumption.The uncertainty of the resistance of combined electrical flow pattern calibration resistor is general only within the scope of 20 ~ 60ppm, and presents the characteristic that resistance reduces and error increases.But the uncertainty of the angular difference of this calibration resistor is general less, about 1 μ rad(1 microradian when power current is measured) in scope.
Accurate AC impedance electric bridge (also usable direct current electric bridge demarcates the resistance error of AC resistance device) is used in the demarcation of measuring resistance usually, and the minimum uncertainty of measurement of accurate AC impedance electric bridge is about 10ppm(K=2).AC impedance electric bridge uses together with canonical reference resistance, canonical reference resistance is generally combined by the nominal value resistance of 1,10,100,1000,10000,100000 ohm, and the angular error of canonical reference resistance represents with microradian (μ rad) usually.
Namely this traditional measuring resistance method is to combined electrical flow pattern calibration resistor by the measuring traceability of alternating current.Mainly there is following problem in this method:
1. the resistance uncertainty of current mode measuring resistance is comparatively large, and because power consumption during Super-Current Measurement is comparatively large, current mode calibration resistor can produce heating, and temperature drift is large;
When 2. demarcating combined electrical flow pattern calibration resistor, because AC impedance bridge-operative electric current is less, comparatively large with combined electrical flow pattern calibration resistor real work current difference, the uncertainty of introducing is difficult to metering.
Two, power measurement source tracing method
As shown in Figure 6, when the uncertainty of power measurement is less, can be measured by the anti-method releasing current amplitude of power instruction value.Express formula W=U*I*COS Φ from active power, when power factor COS Φ is adjusted to 1 and voltage is known, then have I=W/U.At present the power-measuring device of most pin-point accuracy is furnished with the current transformer that uncertainty is not more than 5ppm, its secondary rated current is 5A, the fixing input voltage (as 100V) of power-measuring device, carrys out the measurement range of extend current by the gear (elementary have multiple tap) converting current transformer.
Namely traditional power measurement source tracing method is to calibration power table by the measuring traceability of alternating current.Mainly there is following problem in this method:
1. power measurement source tracing method is subject to power and voltage effective value accuracy of measurement double influence;
2. power measurement source tracing method uncertainty influence factor is many, and can not the angular difference of independent measurement electric current.
In sum, the measuring traceability of alternating current realizes by processes such as electric current/current transformation, current/voltage conversion, so the measuring traceability of alternating current just developed into electric current/current transformation, current/voltage conversion trace to the source, and all there are some problems in the source tracing method of above-mentioned two kinds of existing ac current measurements, be difficult to meet general electricity Measurement Laboratory improve ac current measurement trace to the source accuracy reality in the urgent need to.
Summary of the invention
Technical matters to be solved by this invention is just to provide the source tracing method of a kind of current/voltage for accurate ac current measurement conversion, can improve the accuracy of tracing to the source of current/voltage conversion.
For solving the problems of the technologies described above, the present invention is achieved through the following technical solutions:
For the source tracing method that the current/voltage of ac current measurement converts, comprising:
(1) the alternating voltage ratio benchmark of alternating current source of stable pressure input known proportion error E u is carried out voltage/voltage ratio conversion, obtain normal voltage;
(2) this alternating current source of stable pressure is accessed the voltage-type calibration resistor of known resistance error Eru, obtain normalized current;
(3) by the normalized current current/voltage transducer of gained, according to the size of normal voltage, carry out the transformation of scale of corresponding current/voltage, obtain the voltage after converting;
(4) voltage after conversion and normal voltage are compared acquisition error, then calibrated current/voltage converter with alternating voltage ratio benchmark and voltage-type calibration resistor, the transformation of scale accuracy of also i.e. current/voltage conversion has been traceable to alternating voltage ratio benchmark and voltage-type calibration resistor.
On the basis of the above, the present invention can do following improvement:
In step of the present invention (3), first normalized current input current/power pack is carried out current ratio conversion, normalized current is transformed to the input current meeting current/voltage converter input requirements described in rear class; Wherein, with current comparator assay calibration electric current/power pack, obtain the proportional error Eii2 of electric current/power pack.
In step of the present invention (4), two passages comparing instrument with binary channels alternating voltage access the voltage after described normal voltage and described conversion respectively, obtain the relative error E2 of two passages, then obtain the mapping fault Eiu=E2+Eu+Eru-Eii2 of current/voltage converter, thus the calibration realized current/voltage converter, also namely realize tracing to the source to current/voltage conversion accuracy.
The source tracing method of current/voltage conversion of the present invention also comprises:
(4-1) alternating current constant-current source is inputted the electric current/power pack of other ampere-turn, through suitable current/voltage converter output transform voltage, this voltage of transformation is corresponding with the calibration voltage that calibrated current/voltage converter exports;
(4-2), after being connected in series with the overlapping gear of calibrated electric current/power pack by the electric current/power pack of other ampere-turn, calibration voltage is exported through calibrated current/voltage converter;
(4-3) voltage of transformation and calibration voltage are compared acquisition error, then calibrate the electric current/power pack of other ampere-turn and suitable current/voltage converter thereof with calibrated electric current/power pack and calibrated current/voltage converter, also namely carry out tracing to the source of the transformation of scale accuracy of extend current/voltage changer.
In step of the present invention (4-3), adopt binary channels alternating voltage to compare instrument and acquisition error is compared to voltage of transformation and calibration voltage.
Further, the source tracing method of current/voltage conversion of the present invention also comprises:
(6-1), after exporting with alternating current constant-current source input current/power pack in addition, export through current/voltage converter;
(6-2) export after the current mode calibration resistor of alternating current constant-current source input known phase error simultaneously;
(6-3) output of the output of current/voltage converter and current mode calibration resistor is compared acquisition phase error, then calibrated the phase place of current/voltage converter with current mode calibration resistor, the phase accuracy of also i.e. current/voltage conversion has been traceable to current mode calibration resistor.
The present invention adopts binary channels alternating voltage to compare the output of instrument to the output of current/voltage converter and current mode calibration resistor and compares acquisition phase error.
Compared with prior art, the present invention has following beneficial effect:
(1) the present invention's accuracy can calibrate the amplitude of (tracing to the source) alternating current/voltage transformation with the alternating voltage ratio benchmark and voltage-type calibration resistor reaching ppm magnitude, and alternating voltage ratio benchmark can the absolute method of inspection principle of inductive voltage divider determined of national JJG244-2003 " inductive voltage divider vertification regulation " be examined and determine it, and voltage-type calibration resistor also directly can be delivered to corresponding national measurement calibration authority and traces to the source, and obtain corresponding error amount, it organizes uncertainty less, also the warm drift problem of heating arrival can not be produced, thus finally ensure that the accuracy of tracing to the source of source tracing method of the present invention,
(2) the present invention recycles the little feature of its angular difference uncertainty of current mode calibration resistor, the phase place of independent calibration current/voltage changer, make the accuracy of tracing to the source of its angular difference can reach in 1 μ rad, improve the accuracy of tracing to the source of current/voltage of the present invention conversion further.
(3) the present invention is also by the identical gear serial connection of electric current/current transformer, namely hand drags the mode of hand (back toback), electric current/the current transformer of other ampere-turn and the current/voltage mutual inductor suitable with it is calibrated with calibrated electric current/current transformer, current/voltage mutual inductor, with the conversion ratio of extend current/voltage, adapt to wider ac current measurement scope;
(4) voltage that each exports of the present invention adopts binary channels alternating voltage to compare instrument to compare acquisition error, can balance out the systematic error that binary channels alternating voltage compares the binary channels self of instrument, improve the accuracy that the present invention traces to the source further.
Accompanying drawing explanation
Fig. 1 is the wiring diagram that the present invention calibrates 20 ampere-turn 20mA/4V transducers;
Fig. 2 is the wiring diagram that the present invention calibrates 200 ampere-turn 0.2A/4V transducers;
Fig. 3 is the wiring diagram that the present invention calibrates 2 ampere-turn 0.02A/4V transducers;
Fig. 4 is the wiring diagram of current/voltage of the present invention conversion phase place source tracing correction;
Fig. 5 is the wiring diagram of existing standard electric-resistivity method;
Fig. 6 be existing power measurement trace to the source send out wiring diagram.
Embodiment
The source tracing method of a kind of conversion of the current/voltage for accurate ac current measurement as shown in Figure 1, comprising:
(1) the alternating voltage ratio benchmark of alternating current source of stable pressure input known proportion error E u is carried out voltage/voltage ratio conversion, obtain normal voltage;
Wherein, alternating voltage/voltage ratio benchmark is made up of segmentation equivalent potential screen inductive voltage divider and double-stage voltage transformer 50-100-200-400V/4V.Inductive voltage divider transmits ratio error and is made up of magnetic error and capacitive error, the disclosed synthesis of the vector voltage by active impedance of Chinese invention patent ZL200810218417.X is adopted to eliminate the method for measurement error of transformer, the method is independently detected and convert voltage to by the electric current of the main circuit current of mutual inductor Secondary Winding and detection winding, after amplifying two-way voltage of transformation again, be input to adder operational amplifier summation, the vector voltage synthesis completing active impedance exports, the method effectively can eliminate the measuring error of mutual inductor, improve accuracy of measurement.Wherein magnetic error solves by adopting assembling iron core and the coiling of multistage wire stranding, the way of its capacitive error concealment obtains each section of voltage from field copper, and this voltage correspondence is connected to the shield winding of each section of ratio winding, capacitive error is reduced greatly.The absolute method of inspection principle of inductive voltage divider determined according to national JJG244-2003 " inductive voltage divider vertification regulation ", extends to the voltage ratio benchmark that range is 50-100-200-400V/4V.Alternating voltage/voltage ratio benchmark uncertainty is 2ppm and 2 μ rad.The no-load voltage ratio that the mode of major and minor inductive voltage divider cascade can be adopted to obtain needs obtains proportional error with corrected AC voltage/voltage ratio benchmark.
(2) this alternating current source of stable pressure is accessed the voltage-type calibration resistor of known resistance error Eru, obtain normalized current, wherein, the combined electrical die mould calibration resistor that voltage-type calibration resistor adopts Gening Electric Co., Ltd., Guangzhou City to produce, its model is the 742A type calibration resistor that YCSR-5-10k(also can adopt u s company FLUKE), nominal resistance is 10K ohm, be that the measuring resistance connection in series-parallel of 8 same process structures of 20K ohm forms by resistance, this measuring resistance adopts oil immersion sealing technology, under regulation service condition, its resistance has high stability, index reaches 2ppm/10, because be the reason of combined type calibration resistor, its long-time stability improve about 3 times than single measuring resistance.The uncertainty ratio difference of combined electrical die mould calibration resistor is within 2ppm, and phase differential is 1urad.But due to process structure, the phase accuracy error of this voltage-type calibration resistor is about 3 ~ 5 μ rad, but this phase error does not participate in the present invention traces to the source process.This combined electrical die mould calibration resistor directly can be delivered to corresponding national measurement calibration authority and trace to the source, and obtains corresponding error amount.
(3) first normalized current input current/power pack is carried out current ratio conversion, normalized current is transformed to the input current meeting rear class current/voltage converter input requirements, take current comparator as standard, according to " JJG313-Verification of Measuring Current Transformer vertification regulation ", by mutual-inductor tester, electric current/power pack is transmitted, assay calibration, and draw the proportional error Eii2 of electric current/power pack.After electric current/power pack conversion, export the normalized current current/voltage transducer of gained, the present embodiment refers to 8mA/4V transducer, according to the size of normal voltage, carries out the transformation of scale of corresponding current/voltage, obtains the voltage after converting; Wherein, the electric current/power pack of the present embodiment refers to 20AT(ampere-turn) two-stage current transformer.
(4) voltage after conversion and normal voltage are compared acquisition error, then calibrated current/voltage converter with alternating voltage ratio benchmark and voltage-type calibration resistor, the transformation of scale accuracy of also i.e. current/voltage conversion has been traceable to alternating voltage ratio benchmark and voltage-type calibration resistor; Wherein, two passages comparing instrument with binary channels alternating voltage access the voltage after described normal voltage and described conversion respectively, obtain the relative error E2 of two passages, then obtain the mapping fault Eiu=E2+Eu+Eru-Eii2 of current/voltage converter, thus the calibration realized current/voltage converter, also namely realize tracing to the source to current/voltage conversion accuracy.
Wherein, binary channels alternating voltage compares instrument (abbreviation comparator) and adopts a kind of high precision combined multifunctional calibrator disclosed in Chinese utility model patent ZL201120055472.9, can carry out AC value and the phase calculation of the analog/digital conversion of precision, high-speed data treatment technology and precision.Comparator is graded by input buffer, analog/digital conversion, DC voltage reference data, isolation power supply and digital processes and forms.Two completely isolated designs of passage, capacitive is leaked minimum.Under continuous sampling pattern, power frequency is measured amplitude error and is not more than 0.2ppm, and phase error is not more than 0.2 μ rad, and can carry out passage consistency calibration and zero phase absolute calibration at any time.
As shown in Figure 1, to calibrate the concrete steps of 20 ampere-turn two-stage current transformers and 8mA/4V transducer as follows for the present embodiment:
1. stablize alternating-current voltage source and apply 200V alternating voltage in the top and bottom of 10K combined electrical die mould measuring resistance.
2. the lower end of 10K measuring resistance connects the upper end of two-stage current transformer and the negative input end of operational amplifier (active compensator) simultaneously.
3. the positive input terminal earth terminal of operational amplifier.
4. the output terminal of two-stage current transformer lower end concatenation operation amplifier, and by pull-up resistor to hold.
The impedance of 5. stablizing alternating-current voltage source, operational amplifier, amplifier working power (not shown in FIG.), 10K measuring resistance and transformer primary winding forms active compensation circuit (or claiming constant-current source circuit I=U/R) jointly.
6. two-stage current transformer primary current is 20mA, and secondary current 8mA forms 20mA/4V transducer jointly with 8mA/4V transducer, and export the channel B input end that 4V best friend DC voltage compares instrument, its ratio exports the reference edge with reference to termination comparator channel B.
7. stablize the double-stage voltage transformer of 200V voltage by 200V/4V of alternating-current voltage source, secondary exports the A channel input end that 4V voltage receives comparator, and its ratio exports the reference edge with reference to termination A channel.
8. automatically read the magnitude of voltage of binary channels voltage comparator A, channel B with computer, 200 numbers of getting the same time period are average, and obtain the relative error E2 of two passages with mean value.
9. the mapping fault of combined-voltage comparator A channel is Eu+Ea, the mapping fault of channel B is-Eru+Ei2+Eb, the relative error of two passages is E2=-Eru+Ei2+Eb-Eu-Ea=-Eru+Ei2-Eu+Eba, i.e. Ei2=E2+Eru+Eu-Eba, due to known Eru and Eu, and Eba can self calibration or eliminate in the measurements, then can try to achieve the mapping fault of 20mA/4V, and the mapping fault Eiu2=Ei2-Eii2 of 8mA/4V, Eii2 are known, thus realize the calibration to the transducer of 8mA/4V.
The symbol implication adopted in computing formula is:
Ea---comparator A channel measures amplitude error;
Eb---comparator channel B measures amplitude error;
Eba---comparator binary channels 4V conformity error Eb-Ea;
The proportional error of Eu---50 ~ 400V/4V, embodiment discussion be 200V/4V, the error of the voltage after namely tracing to the source/voltage ratio benchmark 200V/4V;
The proportional error of Eii1---0.2A ~ 100A/80mA, namely through error that current comparator transmits out;
The proportional error of Eii2---0.02A ~ 10A/8mA, namely through error that current comparator transmits out;
The mapping fault of Eiu1---80mA/4V;
The mapping fault of Eiu2---8mA/4V;
The proportional error of Ei1---Eii1+Eiu1;
The proportional error of Ei2---Eii2+Eiu2;
Eru---the resistance error of voltage-type measuring resistance, i.e. the national measurement mechanism error transmitting out.
For the conversion ratio of extend current/voltage, adapt to wider ac current measurement scope, the present embodiment also comprises:
(4-1) alternating current constant-current source is inputted the electric current/power pack (as 200 ampere-turns of the present embodiment, the two-stage current transformer of 2 ampere-turns) of other ampere-turn, through suitable current/voltage converter (80mA/4V transducer and 0.8mA/4V transducer as the present embodiment) output transform voltage, this voltage of transformation is corresponding with the calibration voltage that calibrated current/voltage converter exports;
(4-2), the electric current/power pack of other ampere-turn is connected in series (object be flow through the electric current of two transducers identical) with the overlapping gear of calibrated electric current/power pack after, calibration voltage is exported through calibrated current/voltage converter;
(4-3) voltage of transformation and calibration voltage are compared acquisition error, then calibrate the electric current/power pack of other ampere-turn and suitable current/voltage converter thereof with calibrated electric current/power pack and calibrated current/voltage converter, also namely carry out tracing to the source of the transformation of scale accuracy of extend current/voltage changer.
In step of the present invention (4-3), adopt binary channels alternating voltage to compare instrument and acquisition error is compared to voltage of transformation and calibration voltage.
A) as shown in Figure 2, because 20 ampere-turn two-stage current transformers and 8mA/4V transducer (i.e. 0.2A/4V transducer) are calibrated, 20 ampere-turns can be utilized to be connected in series with the overlapping gear (as 0.2A) of 200 ampere-turns, and namely hand drags hand mode.As in Figure 2-4, the primary current gear parameter designing of the two-stage current transformer of three different ampere-turns is the present embodiment:
100 50 20 10 521 0.5 0.2 (200 ampere-turns)
10 521 0.5 0.2 0.1 0.05 0.02 (20 ampere-turns)
1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 (2 ampere-turns)
The unit of each gear is ampere (A), and above permutation table understands the implication of " hand drags hand ":
A) each mutual inductor all has overlapping identical amount limit (gear).
B) each mutual inductor has different amount limits.
C) identical amount limits the use of in comparison, and different amount limit is as Linear Recurrence foundation.
The rated secondary current of three two-stage current transformers is respectively 80mA, 8mA, 0.8mA, three different current/voltage converters are transformed to the rated secondary current of three two-stage current transformers the 4V voltage of nominal respectively, such as, 0.2A electric current is passed into the situation of three identical gears of different ampere-turn current transformers.
The concrete steps that the present embodiment calibrates 200 ampere-turn 0.2A/4V transducer amplitudes are as follows:
1. precision voltage source applies 0.2A alternating current, stable ac current source exports the high-end of high-end connection 200 ampere-turn two-stage current transformer, the low side of 200 ampere-turn two-stage current transformers is connected in series the low side (the capacitive electric leakage that hand drags hand mode can reduce to measure) of 20 ampere-turn two-stage current transformers, the low side of the high termination current source output of 20 ampere-turn two-stage current transformers.
2. the 4V that 20 ampere-turn two-stage current transformers export accesses comparator A channel, and 200 ampere-turn two-stage current transformers export 4V and access comparator channel B.
3. automatically read the magnitude of voltage of binary channels voltage comparator A, channel B with computer, 200 numbers of getting the same time period are average, and obtain the relative error E1 of two passages with mean value.
4. comparator A channel error of indication E2=Ei2+Ea, channel B error of indication E1=Ei1+Eb,
Comparator relative error E1=Ei1+Eb-Ei2-Ea=Ei1-Ei2+Eba, Ei1=E1+Ei2-Eba,
Ei2=E2+Eru+Eu-Eba in above the 9. item is substituted in Ei1=E1+Ei2-Eba,
Namely the error expression of 200 ampere-turn mutual inductor 0.2A/4V is obtained:
Ei1=E1+E2+Eru+Eu-2*Eba
E2 is herein placed on different measuring positions from the E2 reality in above the 9. item at identical device, be fixing due to Eba again and can eliminate, so error source is the same, also be, in 9. item, E2 is become a given value, and A)-4. in item, this value is regarded as the Ei1 that a standard calibration comes in E1.
Wherein, E2 and E1 is the relative error of twice comparator test, and Eru is 10K measuring resistance error, and Eu is the proportional error of 200V/4V, and Eba is comparator passage disparity error.
4. experimental data citing: E2=-14.3ppm, E1=9.3ppm, Eru=3ppm,
Eu=1.2ppm，Eba=0.2ppm，
Then, Ei1 (0.2A/4V)=E1+E2+Eru+Eu-2*Eba=9.3-14.3+3+1.2-2*0.2=-1.2ppm.In formula, the implication of each symbol is identical with above-mentioned definition.
B) as shown in Figure 3, with being same as the same method of calibration 200 ampere-turn 0.2A/4V transducer, 2 ampere-turn 0.02A/4V transducer amplitudes are calibrated.
The phase place that the present embodiment also comprises alternating current/voltage transformation is traced to the source, as shown in Figure 4:
(6-1), after exporting with alternating current constant-current source input current/power pack in addition, export through current/voltage converter;
(6-2) export after the current mode calibration resistor of alternating current constant-current source input known phase error simultaneously;
(6-3) output of the output of current/voltage converter and current mode calibration resistor is compared acquisition phase error, then calibrated the phase place of current/voltage converter with current mode calibration resistor, the phase accuracy of also i.e. current/voltage conversion has been traceable to current mode calibration resistor.
The present invention adopts binary channels alternating voltage to compare the output of instrument to the output of current/voltage converter and current mode calibration resistor and compares acquisition phase error.
The concrete steps that the present embodiment 0.2A/4V transducer, current mode standard and comparator carry out phase correction are as follows:
As shown in Figure 4, YCSR-5-20 Europe combined electrical flow pattern calibration resistor (like product has the A40B etc. of FLUKE company of the U.S.) Gening Electric Co., Ltd., Guangzhou City produced oppositely is connected in series with the assembly of 200AT two-stage current transformer and 80mA/4V transducer, and its current direction is: constant current source high-end → two-stage current transformer is high-end → Europe, the low side → 20 current mode calibration resistor of Europe, two-stage current transformer low side → 20 current mode calibration resistor high-end → get back to constant current source low side.The low side that the reference termination 20 Europe current mode calibration resistor 4V of the A channel of comparator exports, it is high-end that the input termination 20 Europe current mode calibration resistor 4V of comparator A channel exports.The low side that the reference termination 80mA/4V transducer 4V of the channel B of comparator exports, it is high-end that the input termination 80mA/4V transducer 4V of channel B exports.
Automatic reading is carried out with computer after current source stable output, read the phase value of comparator, every 2 seconds read a number, record 200 seconds altogether, every 20 readings do a mean value calculation, draw 5 mean value readings, final mean value φ and standard deviation is calculated according to these 5 average-reading meters, because the discreteness of error value, usually type A evaluation is adopted in precision measurement, namely use " standard deviation " as the reliable estimated value of standard uncertainty, its foundation is from JJF1059-1999 " evaluation of uncertainty in measurement and expression ", the then phase measurement error E of current/voltage converter
φ 1for:
E
φ1=φ-180
Current transformation phase place composition error is:
E
φ=E
φ1+E
φ2+E
φ3
In formula:
E
φ---the phase place composition error of I/U conversion;
E
φ 1---the phase measurement error of I/U transducer;
E
φ 2---the phase error of binary channels combined-voltage comparator;
E
φ 3---the phase error of 20 Europe current mode calibration resistors.
Embodiments of the present invention are not limited thereto; according to foregoing of the present invention; utilize ordinary technical knowledge and the customary means of this area; do not departing under the present invention's above-mentioned basic fundamental thought prerequisite; the present invention can also make the amendment of other various ways, replacement or change, all drops within rights protection scope of the present invention.
Claims (5)
1., for the source tracing method that the current/voltage of accurate ac current measurement converts, it is characterized in that comprising:
(1) the alternating voltage ratio benchmark of alternating current source of stable pressure input known proportion error E u is carried out voltage/voltage ratio conversion, obtain normal voltage;
(2) this alternating current source of stable pressure is accessed the voltage-type calibration resistor of known resistance error Eru, obtain normalized current;
(3) by the normalized current current/voltage transducer of gained, according to the size of normal voltage, carry out the transformation of scale of corresponding current/voltage, obtain the voltage after converting;
(4) voltage after conversion and normal voltage are compared acquisition error, then calibrated current/voltage converter with alternating voltage ratio benchmark and voltage-type calibration resistor, the transformation of scale accuracy of also i.e. current/voltage conversion has been traceable to alternating voltage ratio benchmark and voltage-type calibration resistor;
Described alternating voltage ratio benchmark is made up of segmentation equivalent potential screen inductive voltage divider and double-stage voltage transformer 50-100-200-400V/4V;
In described step (3), first normalized current input current/power pack is carried out current ratio conversion, normalized current is transformed to the input current meeting current/voltage converter input requirements described in rear class; Wherein, with current comparator assay calibration electric current/power pack, obtain the proportional error Eii2 of electric current/power pack;
In described step (4), two passages comparing instrument with binary channels alternating voltage access the voltage after described normal voltage and described conversion respectively, obtain the relative error E2 of two passages, then obtain the mapping fault Eiu=E2+Eu+Eru-Eii2 of current/voltage converter, thus the calibration realized current/voltage converter, also namely realize tracing to the source to current/voltage conversion accuracy.
2. the source tracing method of current/voltage conversion according to claim 1, is characterized in that: the source tracing method of described current/voltage conversion also comprises:
(4-1) alternating current constant-current source is inputted the electric current/power pack of other ampere-turn, the voltage after suitable current/voltage converter output transform, the voltage after this conversion is corresponding with the normal voltage that calibrated current/voltage converter exports;
(4-2) after the electric current/power pack of other ampere-turn being connected in series with the identical gear of electric current of calibrated electric current/power pack, through calibrated current/voltage converter outputting standard voltage;
(4-3) voltage after conversion and normal voltage are compared acquisition error, then calibrate the electric current/power pack of other ampere-turn and suitable current/voltage converter thereof with calibrated electric current/power pack and calibrated current/voltage converter, also namely carry out tracing to the source of the transformation of scale accuracy of extend current/voltage changer.
3. the source tracing method of current/voltage conversion according to claim 2, is characterized in that: in described step (4-3), adopts binary channels alternating voltage to compare instrument and compares acquisition error to the voltage after conversion and normal voltage.
4. the source tracing method of the current/voltage conversion according to any one of claim 1-3, is characterized in that: the source tracing method of described current/voltage conversion also comprises:
(6-1) with alternating current constant-current source input current/power pack after export in addition, then export through current/voltage converter;
(6-2) export after the current mode calibration resistor of alternating current constant-current source input known phase error simultaneously;
(6-3) output of the output of current/voltage converter and current mode calibration resistor is compared acquisition phase error, then calibrated the phase place of current/voltage converter with current mode calibration resistor, the phase accuracy of also i.e. current/voltage conversion has been traceable to current mode calibration resistor.
5. the source tracing method of current/voltage conversion according to claim 4, is characterized in that: adopt binary channels alternating voltage to compare the output of instrument to the output of current/voltage converter and current mode calibration resistor and compare acquisition phase error.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210506270.0A CN103018703B (en) | 2012-11-30 | 2012-11-30 | Current/voltage conversion traceability method for precision alternating current measurement |
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| CN103336263B (en) * | 2013-05-30 | 2015-08-05 | 广东电网公司电力科学研究院 | A kind of 500kV voltage transformer (VT) power-frequency voltage ratio standard calibration method |
| CN106443561B (en) * | 2016-09-23 | 2023-06-16 | 国网江西省电力公司电力科学研究院 | Integral inspection method and device for electric energy metering device with voltage of 35kV or below |
| CN106557104B (en) * | 2017-01-06 | 2018-01-30 | 云南电网有限责任公司电力科学研究院 | A kind of high precision broad frequency wide-range Current Voltage conversion equipment |
| CN109696649B (en) * | 2017-10-24 | 2020-12-25 | 中国电力科学研究院有限公司 | Direct-current voltage proportional quantity value traceability measurement system and method |
| CN109031176A (en) * | 2018-07-05 | 2018-12-18 | 中国人民解放军91388部队 | A kind of Multifunction electricity source measurement standard method |
| CN109541513B (en) * | 2018-12-25 | 2022-02-08 | 北京东方计量测试研究所 | Alternating current micro-current tracing device and method |
| CN109613465B (en) * | 2018-12-27 | 2022-02-01 | 中国电力科学研究院有限公司 | Metering supervision method for automatic verification assembly line of low-voltage current transformer |
| CN111766431B (en) * | 2020-06-11 | 2023-03-21 | 积成电子股份有限公司 | Alternating current voltage and current multiplexing acquisition method and system free of secondary calibration |
| CN112083210B (en) * | 2020-06-15 | 2023-12-05 | 上海市计量测试技术研究院 | Analog standard current divider for measuring broadband current and measuring method thereof |
| CN111736104A (en) * | 2020-08-03 | 2020-10-02 | 苏州华兴源创科技股份有限公司 | Current detection calibration method and device and display device |
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| CN101408598B (en) * | 2008-06-30 | 2011-03-30 | 广州市格宁电气有限公司 | AC trace source DC correcting method |
| CN102445608B (en) * | 2010-10-13 | 2014-02-19 | 领步科技集团有限公司 | Monitoring device and calibration method for electric energy quality |
| CN202033468U (en) * | 2011-03-04 | 2011-11-09 | 广州市格宁电气有限公司 | High precision combined multifunctional calibrator |
| CN102323559B (en) * | 2011-09-02 | 2014-09-17 | 广州市格宁电气有限公司 | Optimal path based alternating current power measuring value transfer method and system |
| CN102495389B (en) * | 2011-12-23 | 2014-09-24 | 安徽节源节能科技有限公司 | Electrical measurement instrument model calibrating method and system |
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