CN102323559B - Optimal path based alternating current power measuring value transfer method and system - Google Patents
Optimal path based alternating current power measuring value transfer method and system Download PDFInfo
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Abstract
The invention discloses an optimal path based alternating current power measuring value transfer method and a system. The method comprises the following steps of: performing discrete measuring value transfer on a component corresponding to each parameter in a laboratory reference transfer device by using a discrete transition reference and checking a laboratory reference, wherein the discrete transition reference is used for correspondingly performing measuring value transfer and calibration according to the highest standard of the national institute of metrology and the highest standard of the national institute of high voltage metrology respectively; performing respective corresponding measuring value transfer on a next stage of laboratory working standard by using the laboratory reference after respective discrete measuring value transfer; and acquiring a high-confidence verification result through a respective discrete verification path.
Description
Technical field
The present invention relates to a kind of interchange electricity metered amount value transmission method, be specifically related to a kind of AC power magnitude transferring method based on optimal path; The invention still further relates to the system that realizes this method.
Background technology
The transmission of quantity value of existing industrial frequency AC electric current, voltage, power and electric energy is to be all based upon high-precision combined single-phase AC power standard scale (or to claim Multi-functional standard electric energy meter or power meter, hereinafter to be referred as standard scale) basis on carry out, being that standard scale is as the transfer calibrator in transmission of quantity value process, is laboratory benchmark transfer device.High-precision standard scale generally adopts integrated design, in standard scale, comprise four core standard apparatuses: alternating voltage ratio benchmark (U/U transducer), alternating current ratio benchmark (I/U transducer), DC voltage benchmark, combined-voltage comparer, these four standard apparatuses are positioned at a complete measuring equipment of the inner formation of instrument chassis, this standard scale is placed in provincial standard laboratory, for next stage normal component is transmitted; In the time need to examining and determine above-mentioned standard scale, because above-mentioned four standard apparatuses do not have external interface, can only examine and determine the overall power parameter of standard scale, the distribution parameter of each standard apparatus self, the alternating-current parameter of device and temperature characterisitic cannot be examined separately, test and trace to the source in the calibration interval.As shown in Figure 1, be prior art AC power transmission of quantity value system and magnitude transferring method; In actual metered work, to the transmission of quantity value of standard scale, need to arrive national standard institute, with the similar standard of high two grades of precision, complete machine be carried out to integral body calibrating, thereby in standard scale, the uncertainty of measurement of each standard apparatus cannot be learnt, also caused the larger uncertainty of measurement of standard scale, make to a certain extent to exchange credible reduction of accuracy of parameter transmission of quantity value, limited standard scale to exchanging the application of parameter comprehensive metering technology; And complete machine need to be transported to national standard institute and go calibrating, calibrating is brought to a lot of inconvenience.
Summary of the invention
The object of the invention is to overcome the above-mentioned shortcoming of existing integrated standard scale, a kind of AC power magnitude transferring method based on optimal path is provided, by discrete separately calibrating path, each parameter corresponding component in the benchmark transfer device of laboratory and next stage laboratory work standard are carried out to discrete transmission of quantity value, thereby obtain the verification result of high confidence level.
Another object of the present invention is to provide the system that realizes above-mentioned a kind of AC power magnitude transferring method based on optimal path.
Object of the present invention can be achieved through the following technical solutions:
An AC power magnitude transferring method based on optimal path, first adopts discrete transition baseline to carry out discrete transmission of quantity value to each parameter corresponding component in the benchmark transfer device of laboratory, calibrating laboratory benchmark; Discrete transition baseline by the highest standard of the highest standard of China National Measuring Science Research Inst. and national high-voltage metering research institute respectively correspondence carry out transmission of quantity value and demarcation; Use again the laboratory benchmark after discrete separately transmission of quantity value to carry out each self-corresponding transmission of quantity value to next stage laboratory work standard; By above-mentioned discrete calibrating path separately, obtain the verification result of high confidence level.
Transition baseline of the present invention is provided with the ratio standard of DC voltage secondary standard, AC resistance standard, alternating current comparison and/or the ratio standard of induction dividing potential drop, and transition baseline transmittance process comprises with the next item down or two:
(a1) by DC voltage benchmark and the AC resistance standard of China National Measuring Science Research Inst.'s highest standard, respectively DC voltage secondary standard, AC resistance standard are carried out to transmission of quantity value and demarcation;
(a2) with the interchange ratio standard of national high-voltage metering research institute highest standard, respectively the ratio standard of the ratio standard of alternating current comparison, induction dividing potential drop is carried out to transmission of quantity value and demarcation.
Laboratory of the present invention benchmark separately discrete transmittance process comprises at least with the next item down:
(b1) by transition DC voltage secondary standard, by eight half word tables, DC voltage primary standard in the benchmark transfer device of laboratory is carried out to transmission of quantity value;
(b2) by the DC voltage primary standard after step b1 transmission, by eight half word tables, the first combined-voltage benchmark in the benchmark transfer device of laboratory is carried out to transmission of quantity value;
(b3) with the ratio standard of transition induction dividing potential drop, by mutual-inductor tester, alternating voltage ratio benchmark in the benchmark transfer device of laboratory is carried out to transmission of quantity value;
(b4) with the ratio standard of transition alternating current comparison, by mutual-inductor tester, alternating current ratio benchmark in the benchmark transfer device of laboratory is carried out to transmission of quantity value.
Laboratory work standard transmittance process of the present invention comprises at least with the next item down:
(c1) by the DC voltage primary standard after transmitting, by eight half word tables, the second DC voltage benchmark in three-phase standard scale is carried out to transmission of quantity value;
(c2) by the DC voltage primary standard after transmitting, by eight half word tables, the 3rd DC voltage benchmark in single-phase multifunctional prover is carried out to transmission of quantity value;
(c3) with the alternating current ratio benchmark after transmitting, the input current ratio benchmark in single-phase multifunctional prover is carried out to transmission of quantity value;
(c4) with the alternating voltage ratio benchmark after transmitting, the input voltage ratio benchmark in single-phase multifunctional prover is carried out to transmission of quantity value;
(c5) by the first combined-voltage benchmark after transmitting, the second combined-voltage benchmark in single-phase multifunctional prover is carried out to transmission of quantity value;
(c6) standard scale forming with the first combined-voltage benchmark after transmitting, alternating current ratio benchmark, alternating voltage ratio benchmark carries out transmission of quantity value mutually to each of three-phase standard scale respectively.
The little current gear that is less than 1A in alternating current ratio benchmark of the present invention carries out transmission of quantity value by transition AC resistance standard.
Another object of the present invention can be achieved through the following technical solutions:
A kind of system transition baseline transfer device of the AC power magnitude transferring method based on optimal path, comprise DC voltage secondary standard, AC resistance standard, AC current comparator, inductive voltage divider, by the highest standard of China National Measuring Science Research Inst. and national high-voltage metering research institute, transition baseline transfer device is carried out to transmission of quantity value and demarcation;
Laboratory benchmark transfer device, comprises alternating voltage ratio benchmark, alternating current ratio benchmark, the first friendship ac/dc comparator, by each transition baseline transfer device, respectively the ingredient of each laboratory benchmark transfer device of correspondence is carried out to transmission of quantity value;
Laboratory work standard is transmitted part, comprises three-phase working stamndard and single-phase working stamndard, respectively each laboratory work standard of correspondence is transmitted to part carry out transmission of quantity value by each laboratory benchmark transfer device ingredient;
By the ingredient of each laboratory benchmark transfer device of the corresponding calibrating of each transition baseline transfer device ingredient difference, and by corresponding each laboratory work standard of calibrating of ingredient difference of each laboratory benchmark transfer device, transmit part again, to improve the degree of confidence of verification result.
Laboratory of the present invention benchmark transfer device also comprises DC voltage primary standard, by described DC voltage secondary standard, by eight half word tables, DC voltage primary standard is carried out to transmission of quantity value.
DC voltage primary standard of the present invention comprises the DC voltage standard of at least two parallel runnings.
The first combined-voltage comparer of the present invention has independent voltage input channel and the electric current input channel arranging, each input channel is equipped with at least two A/D converters and carries out parallel sampling, and being provided with the first DC voltage benchmark in each input channel, the measured value that sampling obtains can directly trace the first DC voltage benchmark; By described DC voltage primary standard, by eight half word tables, the first DC voltage benchmark is carried out to transmission of quantity value.
Three-phase working stamndard of the present invention has at least two three-phase standard scales arranged side by side; Described single-phase working stamndard has at least two single-phase multifunctional provers arranged side by side.
Compared with prior art, tool of the present invention has the following advantages:
(1) distribution parameter of each laboratory benchmark transfer device self, alternating-current parameter and the temperature characterisitic of device can be examined separately, test and trace to the source in the calibration interval;
(2) can obtain the uncertainty of each laboratory benchmark transfer device, adopt the method for calibrating respectively, can, by approximately two accuracy ratings of the transmission of quantity value precision improvement of the transmission of quantity value instrument (uncertainty is about 100ppm) of existing industrial frequency AC electric current, voltage and power, bring up to and be about 20ppm.
(3) can make the error of each laboratory benchmark transfer device and the error of standard scale complete machine have one clearly to compare clearly, thereby make the daily monitoring of standard scale in the calibration interval and examine more conveniently, be applicablely applied to exchange parameter comprehensive metering technology.
(4) adopt discrete calibrating path, light discrete transition baseline is sent to national standard institute, by national standard institute, discrete transition baseline is carried out to transmission of quantity value, with discrete transition baseline, laboratory benchmark transfer device is carried out to transmission of quantity value again, save the inconvenience that carrying laboratory benchmark transfer device brings, and avoided the transmission of quantity value precision adverse effect of transportation to laboratory benchmark transfer device.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of prior art AC power transmission of quantity value device and transmission method;
Fig. 2 is the schematic diagram of the specific embodiment of the invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 2, be a kind of AC power magnitude transferring method and system based on optimal path of the present invention, its transmission of quantity value system comprises: transition baseline transfer device, laboratory benchmark transfer device, laboratory work standard are transmitted part; Wherein:
Transition baseline transfer device, comprises DC voltage secondary standard, AC resistance standard, AC current comparator, inductive voltage divider;
The transmission of quantity value process of transition baseline is: by DC voltage benchmark and the AC resistance standard of China National Measuring Science Research Inst.'s highest standard, respectively DC voltage secondary standard, AC resistance standard are carried out to transmission of quantity value and demarcation; With the interchange ratio standard of national high-voltage metering research institute highest standard, respectively the ratio standard of AC current comparator, induction dividing potential drop is carried out to transmission of quantity value and demarcation; The transmission that is discrete path to the transition baseline transmission of quantity value process of DC voltage secondary standard, AC resistance standard, AC current comparator, inductive voltage divider above, can transmit independently of one another.Can select as required the ingredient in wherein one or more transition baseline transfer devices to carry out discrete transmission of quantity value.
Laboratory benchmark transfer device, comprises alternating voltage ratio benchmark, alternating current ratio benchmark, the first combined-voltage comparer, DC voltage primary standard, has the first DC voltage benchmark in the first combined-voltage comparer;
Laboratory benchmark separately discrete transmission of quantity value process is: by transition DC voltage secondary standard, by eight half word tables, DC voltage primary standard in the benchmark transfer device of laboratory is carried out to transmission of quantity value; By the DC voltage primary standard after transition DC voltage secondary standard is transmitted, by eight half word tables, the first combined-voltage comparer in the benchmark transfer device of laboratory is carried out to transmission of quantity value; Ratio standard by transition induction dividing potential drop, by mutual-inductor tester, carries out transmission of quantity value to alternating voltage ratio benchmark in the benchmark transfer device of laboratory; Use transition AC current comparator, by mutual-inductor tester, alternating current ratio benchmark in the benchmark transfer device of laboratory is carried out to transmission of quantity value, and the little current gear that is less than 1A in alternating current ratio benchmark carries out transmission of quantity value by transition AC resistance standard; The transmission that is discrete path to the laboratory benchmark value transmittance process of voltage ratio benchmark, alternating current ratio benchmark, the first combined-voltage comparer, DC voltage primary standard above, can transmit independently of one another.While needing, also can select the ingredient in wherein one or more laboratory benchmark transfer devices to carry out discrete transmission of quantity value.
Laboratory work standard is transmitted part, comprise three-phase working stamndard and single-phase working stamndard, in three-phase working stamndard, comprise three-phase standard scale, in three-phase standard scale, there is the second DC voltage benchmark, single-phase working stamndard comprises single-phase multifunctional prover, in single-phase multifunctional prover, there is input current ratio benchmark, input voltage ratio benchmark, the second combined-voltage comparer, in the second combined-voltage comparer, there is the 3rd DC voltage benchmark;
The transmission of quantity value process that laboratory work standard is transmitted part is: by the laboratory DC voltage primary standard after transmitting, by eight half word tables, the second DC voltage benchmark in three-phase standard scale is carried out to transmission of quantity value; By the DC voltage primary standard after transmitting, by eight half word tables, the 3rd DC voltage benchmark in single-phase multifunctional prover is carried out to transmission of quantity value; With the laboratory alternating current ratio benchmark after transmitting, the input current ratio benchmark in single-phase multifunctional prover is carried out to transmission of quantity value; With the laboratory alternating voltage ratio benchmark after transmitting, the input voltage ratio benchmark in single-phase multifunctional prover is carried out to transmission of quantity value; By the first combined-voltage benchmark after transmitting, the second combined-voltage benchmark in single-phase multifunctional prover is carried out to transmission of quantity value; The standard scale forming with the first combined-voltage benchmark after transmitting, alternating current ratio benchmark, alternating voltage ratio benchmark carries out transmission of quantity value mutually to each of three-phase standard scale respectively; The transmission that is discrete path to the laboratory benchmark value transmittance process of three-phase standard scale, the second DC voltage benchmark, single-phase multifunctional prover, the second combined-voltage comparer, input current ratio benchmark, input voltage ratio benchmark, the 3rd DC voltage benchmark above, can transmit independently of one another.While needing, also can select that wherein one or more laboratory work standards are transmitted to part ingredient and carry out discrete transmission of quantity value.
Method of the present invention, can be summarized as and first adopt discrete transition baseline to carry out discrete transmission of quantity value to each parameter corresponding component in the benchmark transfer device of laboratory, calibrating laboratory benchmark; Discrete transition baseline by the highest standard of the highest standard of China National Measuring Science Research Inst. and national high-voltage metering research institute respectively correspondence carry out transmission of quantity value and demarcation; Use again the laboratory benchmark after discrete separately transmission of quantity value to carry out each self-corresponding transmission of quantity value to next stage laboratory work standard; By above-mentioned discrete calibrating path separately, obtain the verification result of high confidence level.
Particularly, transition baseline transfer device is sent to China National Measuring Science Research Inst. and national high-voltage metering research institute examines and determine, then the transition baseline transfer device of having examined and determine with each is examined and determine respectively the ingredient that is arranged on each laboratory benchmark transfer device in testing laboratory, and by each laboratory benchmark transfer device, examines and determine respectively each laboratory work standard and transmit part.Laboratory benchmark transfer device is using the benchmark as laboratory work standard transfer device, only for carrying out transmission of quantity value regularly to laboratory work standard; And laboratory work standard is transmitted part for the downward transmission of quantity value of daily calibrating.
The model that is used for the DC voltage secondary standard of transition baseline transmission is 732B, and the 732B that U.S. FLUKE company produces is solid-state voltage reference, and within its year, degree of stability reaches 2ppm.DC voltage secondary standard is after the highest standard transmission of China National Measuring Science Research Inst., the DC voltage value obtaining is shifted to the precision such as eight Semi-digital voltage tables (model is Agilent 3458A) that precision reaches 0.1ppm by employing and is transferred on 10 YCSD-10 standards of DC voltage primary standard, this etc. precision jump operation should in the time short as far as possible after higher level's reference calibration, complete.
For the alternating current impression voltage divider model of transition baseline transmission, being FG2, is that eight dishes can self calibration inductive voltage divider, accuracy≤lppm.Alternating current impression voltage divider is after the highest standard of national high-voltage metering research institute transmits, then ratio error and the phase angle error of by mutual-inductor tester, calibrating each voltage gear of alternating voltage ratio benchmark.
AC current comparator model for transition baseline transmission is BL0441, its accuracy≤1ppm.AC current comparator is after the highest standard of national high-voltage metering research institute transmits, then ratio error and the phase angle error of by mutual-inductor tester, calibrating each current gear of alternating current ratio benchmark.
The model that is used for the AC resistance standard of transition baseline transmission is YCSR-5, is four terminal precision resistors, and its standard resistance is 20 ohm.The high-accuracy resistance that adopts U.S. VISHY company to produce, resistance model specification is VCS232ZT-80R00-0.02%, by 4 high-accuracy resistance parallel connections, forms 20 ohm, and is assembled into coaxial form to reduce distribution parameter impact.Temperature coefficient≤the 0.05ppm/ ℃ of AC resistance standard, time constant≤1 * 10
-9s, uncertainty≤5ppm.AC resistance standard is after the highest standard transmission of China National Measuring Science Research Inst., for calibrating ratio error and the phase angle error of the following little current gear of 1A of alternating current ratio benchmark.
It for the DC voltage primary standard of laboratory benchmark transmission, is the High Level DC Voltage benchmark of Measurement Laboratory.DC voltage primary standard adopts 10 DC voltage standard paired runnings that model is YCSD-10, forms the DC voltage primary standard in AC power transmission of quantity value system of the present invention.It is core that YCSD-10 standard be take output 7V DC voltage fiducial chip LTZ1000ACH, adds upper outside constant temperature system and forms.Voltage reference chip itself has constant temperature system in sheet, and little power consumption is and stable fast, and its typical year changing value is only 0.83ppm, and temperature coefficient is only 0.03ppm/ ℃, the low 1.2uVp-p that reaches of noise.These 10 YCSD-10 DC voltage standard paired runnings, its primary standard DC voltage is after statistical computation output again, makes output dc voltage uncertainty only be equivalent to use a stage fiducial device error criterion
can guarantee the year variation≤1ppm of DC voltage primary standard.The DC voltage value of DC voltage primary standard shifts by employing eight Semi-digital voltage tables that precision reaches 0.1ppm and carries out transmission of quantity value to the high stability dc voltage reference of laboratory standard apparatus the first combined-voltage comparer inside and the high stability dc voltage reference of working stamndard device inside.
Mutual-inductor tester model for laboratory benchmark transmission is HEG6, and the current return of mutual-inductor tester has 0.1A shelves, and voltage circuit has 5V shelves, and the minimum resolution of homophase phase-splitting and quadrature component is 1 * 10
-7.By mutual-inductor tester, using transmitting the inductive voltage divider of demarcation and AC current comparator through higher level as Transfer Standards, calibrate respectively ratio error and the phase angle error of alternating current ratio benchmark and alternating voltage ratio benchmark.
Laboratory benchmark transfer device comprises the first combined-voltage comparer, alternating current ratio benchmark, alternating voltage ratio benchmark, the first DC voltage benchmark is equipped with in the first combined-voltage comparer inside, totally four standard apparatuses, are about to the separately independent setting of four standard apparatuses of combined single-phase AC power standard scale.The model of alternating current ratio benchmark is wherein YCHL-4, the I/U transducer of two-stage current transformer and 80mA/4V, consists of.The current ratio gear of alternating current ratio benchmark is 0.2A/80mA, 0.5A/80mA, 1A/80mA, 2A/80mA, 5A/80mA, 10A/80mA, 20A/80mA, 50A/80mA, 100A/80mA, design accuracy≤2ppm.And the I/U transducer of 80mA/4V is for converting the normalized current 80mA of two-stage current transformer secondary to 4V alternating voltage by calibration with current signal, then is input to the first combined-voltage comparer and measures.The I/U converter using of this 80mA/4V the vector voltage synthetic technology of active impedance eliminate the measuring error of mutual inductor.The expansion downwards of the range of alternating current ratio benchmark input, such as be low to moderate below the expansion of 2mA from 0.2A, also realizes by I/U transducer.The model of alternating voltage ratio benchmark is wherein YCHY-4, adopts double-stage voltage transformer to carry out voltage transformation, and voltage ratio gear is 50V/4V, 100V/4V, 200V/4V, 400V/4V, design accuracy≤2ppm.Elementary and the secondary voltage ratio of the double-stage voltage transformer of employing passive techniques design is only decided by the turn ratio of its elementary and secondary ratio winding, and process control technology is ripe, so alternating voltage ratio benchmark has high accuracy and long-time stability.The model of the first combined-voltage comparer is wherein YCXX-01B, the first combined-voltage comparer has voltage input channel and electric current input channel, and two passages in comparer inside are all equipped with independently the first DC voltage benchmark of high stability, measured value can directly trace these two the first DC voltage benchmark of comparer inside.
In the first combined-voltage comparer, the sample circuit of two passages adopts the A/D converter of 16 bit serial outputs, each passage all configures five A/D converters, this A/D converter employing successively approaches relative method and realizes analog/digital conversion, its switching network is capacitor array, and electric capacity is pressed binary weight and distributed.In sheet, also there is sampling/maintenance and automatic calibration circuit, the error effect that the error that automatic calibration circuit recoverable capacitor array is introduced and the imbalance of sample/hold circuit bring to conversion, so A/D converter chip does not need to install any adjustment element outward, can obtain very high conversion performance, switching rate is 100kSPS (being equivalent to switching time is 10 μ s), the linearity of can obtain within the scope of gamut ± 1LSB.In order to improve the impact of performance and many other uncertain factors of minimizing of the first ac/dc comparator, guarantee its uncertainty≤5ppm, mainly taked following 4 technical measures:
1. adopt the DC voltage benchmark of high stability:
Voltage channel in the first combined-voltage comparer machine and current channel all adopt independently 7V DC voltage fiducial chip LTZ1000ACH directly to trace to the source, and are provided with separately the first DC voltage benchmark independent and that mutually isolate in voltage channel and current channel.
2. adopt multi-channel A/D parallel sampling:
Voltage channel in the first combined-voltage comparer machine and current channel all adopt 5 A/D converter parallel sampling modes, the measured value that sampling obtains directly trace the first DC voltage benchmark, by statistical method, export afterwards as calculated mean value, the overall uncertainty of A/D converter output can be reduced to while using single A/D converter
3. full isolation and complete symmetry design:
The A/D sample circuit of two input channels of voltage and current of the first combined-voltage comparer adopts the mode of isolation completely, can reduce the high frequency noise impact of ground line current cross influence between voltage channel and current channel and digital circuit, improve the frequency response to harmonic signal.
4. self calibration and the calibration of absolute 0 ° of degree calibrating mode:
This A/D converter inside has automatic calibration program, can improve the conversion accuracy of A/D converter in measurement.The long-time stability of 0 ° of degree phase measurement of the first combined-voltage comparer are decided by the time reference carrying in machine, it is that the crystal oscillator that 1ppm, variation of daily rate are 0.1ppm produces time clock that this time reference has adopted year variation, the first combined-voltage comparer requires operating frequency phase precision to reach 0.00002 degree when short-term is used, and above-mentioned crystal oscillator cannot meet the demands.Technical Solving of the present invention is to adopt absolute 0 ° of degree calibrating mode to calibrate two passages of voltage and current, absolute 0 ° of degree calibration steps is a high stability 4V signal to be added simultaneously to two passages of the first combined-voltage comparer, then start the self-calibration function of the first combined-voltage comparer, the gain consistance calibration of two passages and the absolute calibration (phase measurement is actual is the measurement of pulse duty factor) of interchannel phase shift have just been obtained, obtained the result higher than crystal oscillator clock accuracy, survey two communication channel delay disparity errors and be less than 1 * 10
-9second.
For the laboratory work standard of daily calibrating going down, transmit part and comprise three-phase working stamndard and single-phase working stamndard.
The three-phase standard scale that three-phase working stamndard is SZ-03A-K33E by two models forms, three-phase standard scale composition error is less than 0.005%, two three-phase standard scale paired runnings, by the method for statistics, determine and obtain the result of measuring three phase electric power parameter, its uncertainty can be reduced to while using separate unit standard scale
guarantee the uncertainty≤30ppm of AC power measurement.These two three-phase standard scales are through special technique design, its three-phase sample circuit is completely independent mutually, being equivalent to the single-phase standard scale of Jiang Santai is contained in a cabinet, there is the second DC voltage benchmark of three high stabilities three-phase standard scale inside, every phase has an independently second DC voltage benchmark, for in the machine of measured value, directly trace to the source, the second DC voltage benchmark also has independently IO interface and is drawn out on the panel of three-phase standard scale, by DC voltage primary standard, the second DC voltage benchmark is carried out to transmission of quantity value, with the first combined-voltage comparer, alternating current ratio benchmark, the standard scale that alternating voltage ratio benchmark forms carries out transmission of quantity value mutually to each of three-phase standard scale respectively.Utilize this characteristic can expand easily use, such as two three-phase standard scales being used as 6 single-phase standard scales, if also adopt the method for statistics to measure single-phase electricity power parameter, its uncertainty of measurement can be reduced to while using separate unit (single-phase)
greatly improve the reliability of measuring.
Single-phase working stamndard for daily calibrating going down is that the single-phase multifunctional prover that three models are YC-01B forms, three single-phase multifunctional provers adopt the mode of paired running, adopt the method for statistics to obtain the result of measuring single-phase electricity power parameter, its uncertainty of measurement can be reduced to while using separate unit
guarantee to measure the uncertainty≤30ppm of AC power.Single-phase multifunctional prover is a kind of combined multifunctional calibrator of integrated design, mainly by input voltage ratio benchmark, input current ratio benchmark and three funtion parts of the second combined-voltage comparer, formed, three funtion parts all have on the panel that independent input output interface is drawn out to single-phase multifunctional prover, by the first combined-voltage comparer, alternating current ratio benchmark, alternating voltage ratio benchmark, respectively the second combined-voltage comparer, input current ratio benchmark, input voltage ratio benchmark are carried out to transmission of quantity value successively.Design accuracy≤the 5ppm of input voltage ratio benchmark, the design accuracy≤10ppm of input current ratio benchmark, the design accuracy≤5ppm of the second combined-voltage comparer, composition error is less than 0.005%.There is the 3rd DC voltage benchmark (chip used identical with three-phase working stamndard and the first ac/dc comparator) of high stability its second combined-voltage comparer inside, for in the machine of measured value, directly trace to the source, and the 3rd DC voltage benchmark output in machine is directly drawn out on the panel of single-phase multifunctional prover, by DC voltage primary standard, the 3rd DC voltage benchmark is carried out to transmission of quantity value, in the calibration interval, can easily the second combined-voltage comparer be detected, be examined and trace to the source.
Embodiments of the present invention are not limited to this; according to foregoing of the present invention; utilize ordinary skill knowledge and the customary means of this area; do not departing under the above-mentioned basic fundamental thought of the present invention prerequisite; the present invention can also make modification, replacement or the change of other various ways; as other can realize the interchange value delivery applications form that portions is examined and determine, within all dropping on rights protection scope of the present invention.
Claims (7)
1. the AC power magnitude transferring method based on optimal path, is characterized in that:
First adopt discrete transition baseline to carry out discrete transmission of quantity value to each parameter corresponding component in the benchmark transfer device of laboratory, calibrating laboratory benchmark; Discrete transition baseline by the highest standard of the highest standard of China National Measuring Science Research Inst. and national high-voltage metering research institute respectively correspondence carry out transmission of quantity value and demarcation;
Use again the laboratory benchmark after discrete separately transmission of quantity value to carry out each self-corresponding transmission of quantity value to next stage laboratory work standard;
By above-mentioned discrete calibrating path separately, obtain the verification result of high confidence level;
Wherein, described transition baseline is provided with the ratio standard of DC voltage secondary standard, AC resistance standard, alternating current comparison and the ratio standard of induction dividing potential drop, and described transition baseline transmittance process comprises:
(a1) by DC voltage benchmark and the AC resistance standard of China National Measuring Science Research Inst.'s highest standard, respectively DC voltage secondary standard, AC resistance standard are carried out to transmission of quantity value and demarcation;
(a2) with the interchange ratio standard of national high-voltage metering research institute highest standard, respectively the ratio standard of the ratio standard of alternating current comparison, induction dividing potential drop is carried out to transmission of quantity value and demarcation;
Described laboratory benchmark separately discrete transmittance process comprises:
(b1) by transition DC voltage secondary standard, by eight half word tables, DC voltage primary standard in the benchmark transfer device of laboratory is carried out to transmission of quantity value;
(b2) by the DC voltage primary standard after step b1 transmission, by eight half word tables, the first combined-voltage benchmark in the benchmark transfer device of laboratory is carried out to transmission of quantity value;
(b3) with the ratio standard of transition induction dividing potential drop, by mutual-inductor tester, alternating voltage ratio benchmark in the benchmark transfer device of laboratory is carried out to transmission of quantity value;
(b4) with the ratio standard of transition alternating current comparison, by mutual-inductor tester, alternating current ratio benchmark in the benchmark transfer device of laboratory is carried out to transmission of quantity value;
Described laboratory work standard transmittance process comprises:
(c1) by the DC voltage primary standard after transmitting, by eight half word tables, the second DC voltage benchmark in three-phase standard scale is carried out to transmission of quantity value;
(c2) by the DC voltage primary standard after transmitting, by eight half word tables, the 3rd DC voltage benchmark in single-phase multifunctional prover is carried out to transmission of quantity value;
(c3) with the alternating current ratio benchmark after transmitting, the input current ratio benchmark in single-phase multifunctional prover is carried out to transmission of quantity value;
(c4) with the alternating voltage ratio benchmark after transmitting, the input voltage ratio benchmark in single-phase multifunctional prover is carried out to transmission of quantity value;
(c5) by the first combined-voltage benchmark after transmitting, the second combined-voltage benchmark in single-phase multifunctional prover is carried out to transmission of quantity value;
(c6) standard scale forming with the first combined-voltage benchmark after transmitting, alternating current ratio benchmark, alternating voltage ratio benchmark carries out transmission of quantity value mutually to each of three-phase standard scale respectively.
2. the AC power magnitude transferring method based on optimal path according to claim 1, is characterized in that: the little current gear that is less than 1A in described alternating current ratio benchmark carries out transmission of quantity value by transition AC resistance standard.
3. a system that realizes the AC power magnitude transferring method based on optimal path described in claim 1, is characterized in that comprising:
Transition baseline transfer device, comprise DC voltage secondary standard, AC resistance standard, AC current comparator, inductive voltage divider, by the highest standard of China National Measuring Science Research Inst. and national high-voltage metering research institute, transition baseline transfer device is carried out to transmission of quantity value and demarcation;
Laboratory benchmark transfer device, comprise alternating voltage ratio benchmark, alternating current ratio benchmark, the first combined-voltage comparer, by the ingredient of each transition baseline transfer device, respectively the ingredient of each laboratory benchmark transfer device of correspondence is carried out to transmission of quantity value;
Laboratory work standard is transmitted part, comprises three-phase working stamndard and single-phase working stamndard, respectively each laboratory work standard of correspondence is transmitted to part carry out transmission of quantity value by each laboratory benchmark transfer device ingredient;
By the ingredient of each laboratory benchmark transfer device of the corresponding calibrating of each transition baseline transfer device ingredient difference, and by corresponding each laboratory work standard of calibrating of ingredient difference of each laboratory benchmark transfer device, transmit part again, to improve the degree of confidence of verification result respectively.
4. system according to claim 3, is characterized in that: described laboratory benchmark transfer device also comprises DC voltage primary standard, by described DC voltage secondary standard, by eight half word tables, DC voltage primary standard is carried out to transmission of quantity value.
5. system according to claim 4, is characterized in that: described DC voltage primary standard comprises the DC voltage standard of at least two parallel runnings.
6. system according to claim 4, it is characterized in that: described the first combined-voltage comparer has independent voltage input channel and the electric current input channel arranging, each input channel is equipped with at least two A/D converters and carries out parallel sampling, and being provided with the first DC voltage benchmark in each input channel, the measured value that sampling obtains directly trace the first DC voltage benchmark; By described DC voltage primary standard, by eight half word tables, the first DC voltage benchmark is carried out to transmission of quantity value.
7. system according to claim 3, is characterized in that: described three-phase working stamndard has at least two three-phase standard scales arranged side by side; Described single-phase working stamndard has at least two single-phase multifunctional provers arranged side by side.
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