CN211375031U - High-precision calibration test system and equipment for Rogowski coil measured by pulse large current source - Google Patents
High-precision calibration test system and equipment for Rogowski coil measured by pulse large current source Download PDFInfo
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Abstract
The utility model discloses a big electric current source measuring luo shi coil high accuracy calibration test system of pulse, include: the system comprises a current loop consisting of a tested Rogowski coil, a hundred-A-level precision current testing source, a functional digital multimeter, a high-precision data acquisition card, an upper computer and an acquisition and analysis software module, and also discloses a Rogowski coil high-precision calibration device for measuring a pulse high-current source comprising a calibration and test system, wherein the precision low-current source is adopted to replace a traditional high-power pulse current source as a calibration source, so that the requirements of the test device, the test difficulty and the test safety can be effectively reduced; meanwhile, a fine calibration method combining Rogowski coil scale factor current amplitude calibration and frequency calibration is adopted, the influence of amplitude and frequency change on measurement precision in pulse measurement is effectively reduced, and the Rogowski coil calibration precision can be obviously improved compared with the traditional calibration.
Description
Technical Field
The utility model relates to a technical field is measured to the big electric current source of pulse, specifically is the measuring luo shi coil high accuracy calibration test system of the big electric current source of pulse and equipment.
Background
The high-power pulse electric energy source is a key component of electromagnetic emission equipment and has the characteristics of high voltage (more than thousands of volts), large current (more than thousands of amperes), fast pulse (micro nanosecond), high power (megawatt level) and the like. Parameters such as amplitude characteristics, phase characteristics, frequency characteristics and the like of Pulse Forming Network (PFN) current of the high-power pulse electric energy source are indexes for measuring the performance of the high-power pulse electric energy source, and the simulation verification, the optimization design and the accurate performance evaluation of a discharge loop of the whole high-power pulse electric energy source can be carried out by measuring the characteristics. How to measure the ultimate electrical performance of a high-power pulse electrical energy source is one of the problems to be solved urgently at present.
Further, for the measurement of the MW-grade PFN discharge circuit, the most common measurement means at present is to use the rogowski coil as a front-end current sensor, collect current signals by setting an integral mode and using a high-precision collection device, and obtain the current of the discharge circuit by back-solving with a scale factor given before the rogowski coil leaves the factory. Although the amplitude range and the measurement frequency of the rogowski coil meet the measurement of the PFN discharge circuit, the measurement error generated by the current solving mode based on the fixed scale factor is usually over 1 percent, the actual test requirement cannot be met, and how to reduce the measurement error of the rogowski coil is one of the key technologies for PFN discharge circuit measurement.
Furthermore, the traditional method for improving the measurement accuracy of the rogowski coil is to calibrate the calibration factor of the rogowski coil, and the calibration method usually selects a coaxial shunt to be connected in series in a PFN discharge circuit, measures the voltage at two ends of the coaxial shunt, and outputs the actual calibration factor by comparing with the rogowski coil measurement. The calibrated scale factor is more suitable for the measurement field condition, so the method can improve the Rogowski coil measurement accuracy to a certain extent, but the existing calibration means has the following defects:
(1) the accuracy of the calibration is low. The requirement of a high-power pulse power source on the measurement precision of the Rogowski coil is within 5 per thousand, and the calibration precision of the calibration method cannot meet the requirement;
(2) the scale factor is less applicable under the condition of single frequency. In actual measurement, due to the self characteristics of the rogowski coil and the comprehensive influence of the conditioning circuit, the rogowski coil has large scale factor difference under different frequency conditions, and the calibration method of the scale factor under the fixed frequency condition has a good effect on a 50Hz power frequency large current test occasion, but cannot meet the high-precision measurement requirement of a PFN discharge loop which is a measurement object with wide frequency spectrum component distribution. Therefore, how to reduce the influence of the frequency on the scale factor is another problem of solving the measurement of the PFN discharge loop.
Aiming at the problems that the MW-level power pulse electric energy for calibration is less, the installation difficulty of a measurement method adopting coaxial shunts connected in series is higher, adverse factors are easily generated on testers and test equipment, and how to improve the safety of the testers and the test equipment is one of the key points of Rogowski coil calibration.
SUMMERY OF THE UTILITY MODEL
An embodiment aim at provides pulse heavy current source measuring luo shi coil high accuracy calibration test system and equipment to solve above-mentioned problem.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a rogowski coil high accuracy calibration test system that pulse heavy current source measured which characterized in that includes: the system comprises a Rogowski coil to be tested, a hundred-A-level precision current testing source, a functional digital multimeter, a high-precision data acquisition card, an upper computer and an acquisition and analysis software module, wherein the hundred-A-level precision current testing source comprises a current loop formed by a signal generator, a precision power amplifier and a load resistor, an output channel of the signal generator is connected to a signal input interface of the precision power amplifier, an output terminal of the precision power amplifier is connected with a load resistor array in parallel, a multi-turn coil is wound on the current loop of the hundred-A-level precision current testing source and penetrates through the Rogowski coil, probes of the functional digital multimeter are respectively placed at two ends of the load resistor, and the high-precision data acquisition card, the upper computer and the acquisition and analysis software module form.
The utility model provides a rogowski coil high accuracy calibration equipment that pulse heavy current source measured, includes the rogowski coil high accuracy calibration test system that foretell pulse heavy current source measured, still includes:
the processor is used for executing the program stored in the memory and is connected with a Rogowski coil high-precision calibration test system for measuring the pulse large current source;
a memory for storing a program for execution by the processor to perform the steps of:
s1, establishing an adjustable hundred-A-level precision current test source:
the high-power precise current generating source is formed by a signal generator and a precise power amplifier, meanwhile, a low-temperature drift precise resistor is used as a load resistor, a precise current testing source is built, the type, amplitude characteristic and frequency characteristic of a signal flowing through the load current are changed by adjusting the signal type and amplitude of the signal generator and the proportional magnitude of the precise power amplifier, and a testing source is provided for the linearity calibration and frequency calibration of the Rogowski coil; a multi-turn coil is wound on a current loop and penetrates through a Rogowski coil, the maximum primary current flowing through the interior of the Rogowski coil is increased to 500A, and the Rogowski coil induces the following currents:
wherein, IGeneral assemblyIs the total primary current flowing through the Rogowski coil; n is the number of turns of the coil; v is the voltage at two ends of the load resistor; r is a load resistor;
the output amplitude can be obtained according to the factory scale factor K:
V＝KIgeneral assembly；
S2, establishing a Rogowski coil scale factor calibration test system:
calibration testThe testing system comprises a tested Rogowski coil, a hundred-A-level precision current testing source, a functional digital multimeter, a high-precision data acquisition card, an upper computer and an acquisition and analysis software module; the functional digital multimeter probes are respectively arranged at two ends of the load resistor and used for measuring voltage and resistance at two ends of the load resistor of the current test source to obtain current flowing through the load resistor; calculating the actual current flowing through the Rogowski coil according to the number of turns of the coil; the high-precision data acquisition card, the upper computer and the acquisition and analysis software module form a Rogowski coil output voltage testing unit, and the output voltage amplitude is acquired in real time; according to a scale factor calculation formula: k is ═ Iin/VoutA scale factor value can be calculated, wherein IinIs primary side current, VoutOutputting voltage for the Rogowski coil;
s3, calibrating current amplitude of Rogowski coil scale factor:
setting an input waveform and an input frequency of a signal generator, changing a proportional coefficient of a power amplifier to adjust the size of a primary side input current, measuring a plurality of groups of load voltages, load resistors and output voltages of the Rogowski coil by using a calibration test system under the condition of different proportional coefficients, and averaging; wherein the average value of the load voltage is
Mean value of load resistance of
Output voltage mean value of Rogowski coil is
According to the primary side current calculation formula
The actual primary side current mean value under different magnification conditions can be obtained:
according to K ═ Iin/VoutThe mean scale factor values under different current conditions can be calculated:
to the measured
And
and performing linear fitting to obtain a relation between the scale factor and the current amplitude change:
the linearity of the fitted straight line is worked out, and within 3 per thousand, the influence of the current amplitude change on the scale factor is small, and the method for extrapolating the scale factor under the high-current condition by adopting the low-current generating source has feasibility;
s4, calibrating the Rogowski coil scale factor frequency:
the sine wave is used as signal input, the multiple of the amplifier is set to be fixed, the sine wave input frequency is changed at equal intervals, and the mean value of scale factors under different frequency conditions is measured according to a similar method in S3; at the same time, according to
And corresponding f ═ f1，f2,f3,…fn]And (3) performing curve fitting to obtain the relation between the scale factor and the current frequency change:
s5, verifying after calibration of Rogowski coil scale factors:
by randomly varying the sine wave input frequency and measuring the actual current value I flowing through the Rogowski coilTotal of iAnd the voltage value output by the Rogowski coil
Solving theoretical scale factor K by using frequency of input signal to carry in frequency fitting curvei＝F(fi) The measured current value is
And calculating the relative error γ:
after calibration, the measurement error of the Rogowski coil with the nominal 1% precision under different frequency conditions is better than 5 per mill, and then the calibration requirement is met.
In one alternative: in step S1, in order to ensure that the current and voltage flowing through the load resistor are within the rated range, the low temperature drift precision resistor is connected in parallel by 25 60 Ω aluminum shell resistors, the total resistance value is controlled to be 3 Ω, and the maximum allowable current is 15A; the aluminum shell resistor has a heat dissipation effect, and meanwhile, the parallel aluminum shell resistor is placed on a large-scale heat dissipation copper sheet, so that the overhigh temperature of the resistor is avoided.
In one alternative: in step S2, the functional digital multimeter is an eight-bit half-high precision digital multimeter; the high-precision data acquisition card is a 16-bit data acquisition card and is used for reducing the error of a measuring instrument and ensuring the accuracy of measuring the mean voltage of the sine wave and the load resistance.
In one alternative: in step S2, the upper computer measurement software has functions of waveform display, waveform spectrum analysis, amplitude measurement, and rise time measurement, and during sine wave measurement, the measured voltage peak is converted into a voltage effective value for scale factor calculation.
In one alternative: in step S3, the current amplitude variation range is 50A-500A, and the signal source input signal frequency is 100 Hz; if the function linearity between the measured amplitude and the scale factor is better than 3 per thousand, averaging the scale factors of the current amplitude change under each frequency condition, and using the average as a fixed scale factor; if the linearity is poor, the effect of the amplitude change on the scale factor is fitted to a curve and the frequency calibration curve of S4 is error corrected.
In one alternative: in step S4, according to the measurement characteristics of the Rogowski coil, the frequency variation range in the frequency calibration process is 100 Hz-10 KHz, and the equidistant interval is 50 Hz; to improve the calibration accuracy, the measured calibration data were averaged into 50 sets.
In one alternative: in steps S3 and S4, the influence of the current amplitude variation on the scale factor can be used as a fixed error correction factor to correct the frequency model, and the correction method is as follows:
(1) setting the amplitude correction factor to Kv, fixing the amplitude IfUnder the condition of a function of
Corresponding error correction function is
(2) Kv is calculated as follows:
① if
Degree of linearity of<3‰，Kv＝1；
② if
Degree of linearity of>3‰，
In one alternative: the specific calibration working process comprises the following steps:
firstly, a Rogowski coil scale factor calibration test system is set up, and an oscilloscope is adopted to test whether an output signal has distortion;
setting the frequency of a signal source and the amplification factor of a precision amplifier;
the test system works stably for 30min to ensure the resistance value of the load resistor to change stably;
fourthly, the load voltage is measured for multiple times by using the multifunctional digital multimeter, and the output voltage of the Rogowski coil is acquired for multiple times by using a labview software program;
after the single test is finished, the load resistance value is measured in a power-off mode;
sixthly, facilitating all amplitude values and frequency values according to the same measuring steps;
seventhly, fitting an amplitude change curve and a frequency curve, and verifying the calibrated precision;
and (8) after the calibration, if the precision meets the requirement, the calibration test is finished.
Compared with the prior art, the embodiment of the utility model has the following beneficial effects:
the requirement of test equipment, test difficulty and test safety can be effectively reduced by adopting a precise small current source to replace a traditional high-power pulse current source as a calibration source; meanwhile, a fine calibration method combining Rogowski coil scale factor current amplitude calibration and frequency calibration is adopted, the influence of amplitude and frequency change on measurement precision in pulse measurement is effectively reduced, and the Rogowski coil calibration precision can be obviously improved compared with the traditional calibration.
Drawings
FIG. 1 is a block diagram of a Rogowski coil high-precision calibration test system for pulsed high-current source measurement according to a first embodiment of the present invention;
FIG. 2 is a flowchart of the steps executed by a Rogowski coil high-precision calibration device for pulsed high-current source measurement according to a second embodiment of the present invention;
FIG. 3 is a flow chart of a calibration process.
In the figure, 101-a signal generator, 102-a precision power amplifier, 103-a load resistor, 104-a coil, 201-a Rogowski coil to be tested, 202-a functional digital multimeter, 203-a high-precision data acquisition card, 204-an upper computer and 205-an acquisition and analysis software module.
Detailed Description
The present invention will be described in detail with reference to the following embodiments, wherein like or similar elements are designated by the same reference numerals. The embodiments of the present invention are provided only for illustration, and not for limiting the scope of the present invention. Any obvious and obvious modifications or alterations to the present invention can be made without departing from the spirit and scope of the present invention.
Example 1
Referring to fig. 1, in an embodiment of the present invention, a rogowski coil high-precision calibration and test system for measuring a pulse large current source includes: the system comprises a Rogowski coil to be tested, a hundred-A-level precision current testing source, a functional digital multimeter, a high-precision data acquisition card, an upper computer and an acquisition and analysis software module, wherein the hundred-A-level precision current testing source comprises a current loop formed by a signal generator, a precision power amplifier and a load resistor, an output channel of the signal generator is connected to a signal input interface of the precision power amplifier, an output terminal of the precision power amplifier is connected with a load resistor array in parallel, a multi-turn coil is wound on the current loop of the hundred-A-level precision current testing source and penetrates through the Rogowski coil, probes of the functional digital multimeter are respectively placed at two ends of the load resistor, and the high-precision data acquisition card, the upper computer and the acquisition and analysis software module form.
Example 2
Referring to fig. 2 to 3, in an embodiment of the present invention, a rogowski coil high-precision calibration device for measuring a pulse large current source includes the rogowski coil high-precision calibration test system for measuring a pulse large current source described in embodiment 1, and further includes:
the processor is used for executing the program stored in the memory and is connected with a Rogowski coil high-precision calibration test system for measuring the pulse large current source;
a memory for storing a program for execution by the processor to perform the steps of:
s1, establishing an adjustable hundred-A-level precision current test source:
the high-power precise current generating source is formed by a signal generator and a precise power amplifier, meanwhile, a low-temperature drift precise resistor is used as a load resistor, a precise current testing source is built, the type, amplitude characteristic and frequency characteristic of a signal flowing through the load current are changed by adjusting the signal type and amplitude of the signal generator and the proportional magnitude of the precise power amplifier, and a testing source is provided for the linearity calibration and frequency calibration of the Rogowski coil; a multi-turn coil is wound on a current loop and penetrates through a Rogowski coil, the maximum primary current flowing through the interior of the Rogowski coil is increased to 500A, and the Rogowski coil induces the following currents:
wherein, IGeneral assemblyIs the total primary current flowing through the Rogowski coil; n is the number of turns of the coil; v is the voltage at two ends of the load resistor; r is a load resistor;
the output amplitude can be obtained according to the factory scale factor K:
V＝KIgeneral assembly；
S2, establishing a Rogowski coil scale factor calibration test system:
the calibration test system comprises a tested Rogowski coil, a hundred-A-level precision current test source, a functional digital multimeter, a high-precision data acquisition card, an upper computer and an acquisition analysis software module; the functional digital multimeter probes are respectively arranged at two ends of the load resistor and used for measuring voltage and resistance at two ends of the load resistor of the current test source to obtain current flowing through the load resistor; calculating the actual current flowing through the Rogowski coil according to the number of turns of the coil; the high-precision data acquisition card, the upper computer and the acquisition and analysis software module form a Rogowski coil output voltage testing unit, and the output voltage amplitude is acquired in real time; according to a scale factor calculation formula: k is ═ Iin/VoutA scale factor value can be calculated, wherein IinIs primary side current, VoutOutputting voltage for the Rogowski coil;
s3, calibrating current amplitude of Rogowski coil scale factor:
setting input waveform and input frequency of signal generator, changing proportional coefficient of power amplifier to regulate input current at different ratiosMeasuring a plurality of groups of load voltages, load resistances and output voltages of the Rogowski coil by using a calibration test system under the condition of example coefficients, and averaging; wherein the average value of the load voltage is
Mean value of load resistance of
Output voltage mean value of Rogowski coil is
According to the primary side current calculation formula
The actual primary side current mean value under different magnification conditions can be obtained:
according to K ═ Iin/VoutThe mean scale factor values under different current conditions can be calculated:
to the measured
And
and performing linear fitting to obtain a relation between the scale factor and the current amplitude change:
and calculating the linearity of the fitted straight line, wherein within 3 per thousand, the influence of the current amplitude change on the scale factor is small, and the scale factor under the condition of large current is extrapolated by adopting a small current generating sourceThe method has feasibility;
s4, calibrating the Rogowski coil scale factor frequency:
the sine wave is used as signal input, the multiple of the amplifier is set to be fixed, the sine wave input frequency is changed at equal intervals, and the mean value of scale factors under different frequency conditions is measured according to a similar method in S3; at the same time, according to
And corresponding f ═ f1，f2,f3,…fn]And (3) performing curve fitting to obtain the relation between the scale factor and the current frequency change:
s5, verifying after calibration of Rogowski coil scale factors:
by randomly varying the sine wave input frequency and measuring the actual current value I flowing through the Rogowski coilTotal of iAnd the voltage value output by the Rogowski coil
Solving theoretical scale factor K by using frequency of input signal to carry in frequency fitting curvei＝F(fi) The measured current value is
And calculating the relative error γ:
after calibration, the measurement error of the Rogowski coil with the nominal 1% precision under different frequency conditions is better than 5 per mill, and then the calibration requirement is met.
In step S1, in order to ensure that the current and voltage flowing through the load resistor are within the rated range, the low-temperature-drift precision resistor is connected in parallel by 25 60 Ω aluminum shell resistors, the total resistance value is controlled to be 3 Ω, and the maximum allowable current is 15A; the aluminum shell resistor has a heat dissipation effect, and meanwhile, the parallel aluminum shell resistor is placed on a large-scale heat dissipation copper sheet, so that the overhigh temperature of the resistor is avoided.
In step S2, the functional digital multimeter is an eight-bit half-high precision digital multimeter; the high-precision data acquisition card is a 16-bit data acquisition card and is used for reducing the error of a measuring instrument and ensuring the accuracy of measuring the mean voltage of the sine wave and the load resistance.
In step S2, the upper computer measurement software has functions of waveform display, waveform spectrum analysis, amplitude measurement, and rise time measurement, and during sine wave measurement, the measured voltage peak is converted into a voltage effective value for scale factor calculation.
In step S3, the current amplitude variation range is 50A-500A, and the signal source input signal frequency is 100 Hz; if the function linearity between the measured amplitude and the scale factor is better than 3 per thousand, averaging the scale factors of the current amplitude change under each frequency condition, and using the average as a fixed scale factor; if the linearity is poor, the effect of the amplitude change on the scale factor is fitted to a curve and the frequency calibration curve of S4 is error corrected.
In step S4, according to the measurement characteristics of the Rogowski coil, the frequency variation range in the frequency calibration process is 100 Hz-10 KHz, and the equidistant interval is 50 Hz; to improve the calibration accuracy, the measured calibration data were averaged into 50 sets.
In steps S3 and S4, the influence of the current amplitude variation on the scale factor can be used as a fixed error correction factor to correct the frequency model, and the correction method is as follows:
(3) setting the amplitude correction factor to Kv, fixing the amplitude IfUnder the condition of a function of
Corresponding error correction function is
(4) Kv is calculated as follows:
① if
Degree of linearity of<3‰，Kv＝1；
② if
Degree of linearity of>3‰，
The specific calibration working process comprises the following steps:
firstly, a Rogowski coil scale factor calibration test system is set up, and an oscilloscope is adopted to test whether an output signal has distortion;
setting the frequency of a signal source and the amplification factor of a precision amplifier;
the test system works stably for 30min to ensure the resistance value of the load resistor to change stably;
fourthly, the load voltage is measured for multiple times by using the multifunctional digital multimeter, and the output voltage of the Rogowski coil is acquired for multiple times by using a labview software program;
after the single test is finished, the load resistance value is measured in a power-off mode;
sixthly, facilitating all amplitude values and frequency values according to the same measuring steps;
seventhly, fitting an amplitude change curve and a frequency curve, and verifying the calibrated precision;
and (8) after the calibration, if the precision meets the requirement, the calibration test is finished.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (6)
1. The utility model provides a rogowski coil high accuracy calibration test system that pulse heavy current source measured which characterized in that includes: the system comprises a Rogowski coil to be tested, a hundred-A-level precision current testing source, a functional digital multimeter, a high-precision data acquisition card, an upper computer and an acquisition and analysis software module, wherein the hundred-A-level precision current testing source comprises a current loop formed by a signal generator, a precision power amplifier and a load resistor, an output channel of the signal generator is connected to a signal input interface of the precision power amplifier, an output terminal of the precision power amplifier is connected with a load resistor array in parallel, a multi-turn coil is wound on the current loop of the hundred-A-level precision current testing source and penetrates through the Rogowski coil, probes of the functional digital multimeter are respectively placed at two ends of the load resistor, and the high-precision data acquisition card, the upper computer and the acquisition and analysis software module form.
2. The high-precision calibration test system for the Rogowski coil measured by the pulse large current source as claimed in claim 1, wherein the load resistor is a low-temperature drift precision resistor.
3. The high-precision calibration and test system for the Rogowski coil measured by the pulse large current source as claimed in claim 2, wherein the low-temperature-drift precision resistor is formed by connecting 25 60 Ω aluminum shell resistors in parallel.
4. The pulsed high current source measured rogowski coil high accuracy calibration test system of claim 1, in which the functional digital multimeter is an eight-bit and half high accuracy digital multimeter.
5. The high-precision calibration test system for the rogowski coil of pulse high current source measurement according to claim 1, wherein the high-precision data acquisition card is a 16-bit data acquisition card.
6. A rogowski coil high-precision calibration device for pulsed high-current source measurement, comprising a rogowski coil high-precision calibration test system for pulsed high-current source measurement according to any one of claims 1 to 5, characterized by further comprising:
a memory for storing a program;
and the processor is used for executing the program stored in the memory and is connected with the Rogowski coil high-precision calibration test system for measuring the pulse large current source.
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