CN104316889A - Virtual load method-based generator rotor alternating current impedance tester calibration device - Google Patents
Virtual load method-based generator rotor alternating current impedance tester calibration device Download PDFInfo
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Abstract
The invention discloses a virtual load method-based generator rotor alternating current impedance tester calibration device. The virtual load method-based generator rotor alternating current impedance tester calibration device includes a first high-accuracy meter, a high-stability precise program-control source, a second high-accuracy meter, a digital display and man-machine interface module, a current output terminal which is connected with the first high-accuracy meter and the high-stability precise program-control source respectively, as well as a voltage output terminal which is connected with the high-stability precise program-control source and the second high-accuracy meter respectively. With the virtual load method-based generator rotor alternating current impedance tester calibration device of the invention adopted, defects of large manual workload, high misoperation rate and high calibration difficulty in the prior art can be eliminated. The virtual load method-based generator rotor alternating current impedance tester calibration device has the advantages of small manual workload, low misoperation rate and low calibration difficulty.
Description
Technical field
The present invention relates to the detection technique field of power electronic equipment, particularly, relate to the AC impedance of generator rotator calibration equipment based on dummy load method.
Background technology
AC impedance of generator rotator, being the composite measurement instrument for measuring with analysis generator and phase modifier rotor windings AC impedance, can being realized the AC impedance having rotor windings, power, the isoparametric automatic measurement of frequency by custom-designed metering circuit.Ac impedance measurement instrument calibration, calibrating and testing in, be most important test item to the detection of transient process (comprising transition resistance and transit time) measurement function.In recent years along with the development of science and technology, the AC impedance of generator rotator of the integration that market occurs, provides a kind of light, quick, simple testing tool to vast electrical test personnel, and is used widely.But for these integrated power generation machine rotor ac impedance measurement instrument, market does not also have the special verification pick-up unit for them, in their use procedure, they self accuracy can not get effective guarantee.Therefore, while carrying out ac impedance measurement on a large scale, the verification of ac impedance measurement instrument and Normalization rule also seem and become more and more important.
Domestic have minority unit to carry out calibration operation for AC impedance of generator rotator.Owing to lacking calibrating standard targetedly, therefore the measurement scheme taked has many deficiencies, is mainly effectively to carry out perfect detection and calibration operation to the working condition in the whole range ability of testing tool.In addition, due to test use tester calibration system and true rotor winding working condition variant, cannot simulated machine rotor windings practical working situation really.Moreover the operation such as rewiring adds the probability that people is maloperation, what be unfavorable for precise and high efficiency completes verification, testing.
At present, the calibration operation of AC impedance of generator rotator also needs extensive popularization, also lack complete calibrating standard to retrain the calibration operation of AC impedance of generator rotator, this present situation has had a strong impact on the Normalization rule of accuracy and the instrument measured.Consider that the limits of error and the tested measurement range of existing detection method, accuracy and the convenience of AC impedance of generator rotator nominals a large amount of on market limit, be difficult to carry out convenient, efficient calibration, calibrating and testing to AC impedance of generator rotator.Meanwhile, the calibrating installation of AC impedance of generator rotator also not yet occurs at home, also has no product targetedly even abroad.The specification of generator amature ac impedance measurement instrument and verification, as an important ring of preventive trial, have become the bottleneck that need of work is broken through undoubtedly.Under this kind of background, under the prerequisite cannot using for reference domestic and international successful experience, the research carrying out AC impedance of generator rotator method of calibration and calibration equipment is extremely urgent.
Realizing in process of the present invention, inventor finds at least to exist in prior art the defects such as manual labor amount is large, misuse rate is high and verification difficulty is large.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose the AC impedance of generator rotator calibration equipment based on dummy load method, to realize the advantage that manual labor amount is little, misuse rate is low and verification difficulty is little.
For achieving the above object, the technical solution used in the present invention is: based on the AC impedance of generator rotator calibration equipment of dummy load method, comprise connect successively the first pin-point accuracy table, the program control source of high stability and precision, the second pin-point accuracy table and digital display and human-computer interface module, the current output terminal be connected with described first pin-point accuracy table and the program control source of high stability and precision respectively, and respectively with the output voltage terminals of the program control source of described high stability and precision and the second pin-point accuracy list catenation.
Further, described first pin-point accuracy table, comprises the current sensor, the first Signal-regulated kinase, the first analog-to-digital conversion module and the first measuring and calculating module that are connected in turn between described current output terminal and the program control source of high stability and precision.
Further, the program control source of described high stability and precision, comprise the master controller, signal generation module and the preposition conditioning module that are connected with described digital display and human-computer interface module successively, be connected to the current signal generation module between described preposition conditioning module and current output terminal, first phase/amplitude adjustment module and the first amplifier in turn, and be connected to voltage signal generation module, second phase/amplitude adjustment module and the second amplifier between described preposition conditioning module and output voltage terminals in turn.
Further, described and pin-point accuracy table, comprise the voltage sensor, secondary signal conditioning module, the second analog-to-digital conversion module and the second measuring and calculating module that are connected in turn between described output voltage terminals and master controller.
The AC impedance of generator rotator calibration equipment based on dummy load method of various embodiments of the present invention, due to comprise connect successively the first pin-point accuracy table, the program control source of high stability and precision, the second pin-point accuracy table and digital display and human-computer interface module, the current output terminal be connected with the first pin-point accuracy table and the program control source of high stability and precision respectively, and the output voltage terminals of program control source and the second pin-point accuracy list catenation with high stability and precision respectively; Thus the defect that in prior art, manual labor amount is large, misuse rate is high and verification difficulty is large can be overcome, to realize the advantage that manual labor amount is little, misuse rate is low and verification difficulty is little.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from instructions, or understand by implementing the present invention.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural representation of the AC impedance of generator rotator calibration equipment that the present invention is based on dummy load method;
Fig. 2 the present invention is based on the AC impedance of generator rotator calibration equipment of dummy load method and the connection diagram of AC impedance of generator rotator;
Fig. 3 is the principle of work schematic diagram of high-accuracy voltage sampling module in the present invention;
Fig. 4 is the principle of work schematic diagram of high-precision current sampling module in the present invention;
Fig. 5 is the principle of work schematic diagram of signal generation module in the present invention;
Fig. 6 is the principle of work schematic diagram of preposition conditioning module in the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
For the above-mentioned technical matters existed in prior art, according to the embodiment of the present invention, as depicted in figs. 1 and 2, provide the AC impedance of generator rotator calibration equipment based on dummy load method, particularly about the calibration technology of the AC impedance of generator rotator in power electronic equipment, be a kind of AC impedance of generator rotator calibration equipment concretely.Should based on the AC impedance of generator rotator calibration equipment of dummy load method, calibration can be carried out to ac impedance measurement instrument fast and accurately to detect, meet the needs that calibration detects, stable current source and voltage source is produced according to dummy load method, and preset resistance value by amplitude phase frequency regulated value, thus the synchro measure realized the multinomial measurement function of AC impedance of generator rotator, for the pin-point accuracy testing of AC impedance of generator rotator provides technical method and Practice Measures.
Technical scheme of the present invention, can be connected with tested AC impedance of generator rotator, comprises the program control source of high stability and precision, pin-point accuracy table, digital display and human-computer interface module, and connection between above-mentioned module and steering logic.The program control source of high stability and precision, obtains data feedback by the precision measurement of pin-point accuracy table, thus realizes the auto modification in program control source; Pin-point accuracy table, can the signal such as Real-time Collection electric current and voltage, and respectively by the data feedback that collects to the program control source of high stability and precision and digital display and human-computer interface module; The data that pin-point accuracy table collects are shown by digital display and human-computer interface module in real time, and complete operation personnel are to the setting parameter in the program control source of high stability and precision, achieve and measure and control AC impedance of generator rotator calibration equipment.
In the inventive solutions, dummy load method concrete form is: power source is become virtual form, contains current source module and voltage source module; Current source module, for generation of current signal, and samples to the current value of output terminal and feeds back, obtaining the current signal of standard; Voltage source module, for generation of voltage signal, and samples to the magnitude of voltage of output terminal and feeds back, obtaining the voltage signal of standard.Pin-point accuracy table specifically comprises: for the pin-point accuracy table of current measurement, contain the modules such as current sensor, signal condition, analog to digital conversion, survey calculation; For the pin-point accuracy table of voltage measurement, contain the modules such as current sensor, signal condition, analog to digital conversion, survey calculation.The program control source of high stability and precision specifically comprises: the modules such as the generation of master controller, signal, preposition conditioning, current signal process, voltage signal process, phase-amplitude adjustment, amplifier.
AC impedance of generator rotator calibration equipment adopts four-end method measuring principle verification AC impedance of generator rotator.The current/voltage terminal of AC impedance of generator rotator calibration equipment connects electric current and the voltage terminal of test specimen respectively, although test specimen is seen on the whole as two-port network, the electric current output loop of AC impedance of generator rotator and voltage measurement circuit devise the measurement terminal of mutual electrical isolation respectively.The four-end method measuring principle of AC impedance of generator rotator develops the prerequisite condition of AC impedance of generator rotator calibration equipment.
In the inventive solutions, pin-point accuracy table specifically comprises: voltage sample module, to voltage signal sampling, obtains voltage sampling signal; Current sample module, to current signal sampling, obtains current sampling signal; Signal-regulated kinase, amplifies the signal filtering collected, is connected with analog-to-digital conversion module; Analog-to-digital conversion module, with voltage sample module, current sample module be connected, carry out analog to digital conversion for right voltage sampling signal, current sampling signal; Measuring and calculating module, with analog to digital converter be connected, for carrying out fast fourier transform to the voltage sampling signal after analog to digital conversion, current sampling signal, obtaining measurement result, and feeding back to main control module.
In the inventive solutions, the program control source of high stability and precision specifically comprises: main control module, for receiving the parameters that operating personnel set calibration equipment, receiving every value of pin-point accuracy table feedback, and making corresponding control; Signal generation module, for generating initial voltage signal, current signal; Phase-amplitude adjustment module, with waveform generating module be connected, carry out the adjustment of amplitude and phase place for right voltage signal, current signal; Power amplifier module, with phase adjustment block be connected, for the voltage signal after phase adjusted, current signal are carried out power amplification; Current output terminal and output voltage terminals, with power amplifier module be connected, for pin-point accuracy table that the voltage signal after power amplification, current signal are sent to and tested AC impedance of generator rotator.
Generally speaking, technical scheme of the present invention, is that creationary applying in AC impedance of generator rotator calibration equipment is shown in this tight source comprising high stability accurate program controlled source and pin-point accuracy table formation, thus advances the technical progress in this field.Such as, in the inventive solutions:.
measuring and calculating module
Measuring and calculating module mainly comprises high-accuracy voltage measurement module and high-accuracy voltage measurement module.
1. high-accuracy voltage sampling module
High-accuracy voltage sampling module as shown in Figure 3, adopts anti-phase scale operation amplifying circuit to process.Voltage source output voltage
uai carries out ratio decay by R4, R25, R7/R10/R18, OP97, and gearshift function is selected R7/R10/R18 tri-resistance by control SW11, and these three resistance of R7/R10/R18 determine the feedback factor of this feedback network.Thus change the input/output relation of anti-phase scale operation amplifying circuit.OP97 is the technical grade precision amplifier of low-power consumption, and it is suitable for use in accurate integrator and sampling hold circuit very much, and the output voltage of OP97 is designated as
uao ', then have
The R11 of later stage, R12, AD706 carry out buffering conditioning to signal, and this is a homophase operational amplification circuit.AD706 is the binary channels bipolar operational amplifier of a kind of more low-power consumption more low noise, carries out internal compensation during this period, provides unity gain.R11 with R12 resistance is identical, and its operation relation is:
Its output signal
uao sends into A/D converter, fully to meet the incoming level requirement of A/D sampling.
2. high-precision current sampling module
High-accuracy voltage sampling module as shown in Figure 4, adopts anti-phase scale operation amplifying circuit to process.Big current signal is sampled by the current transformer of 100A:50mA, then carries out dividing potential drop through R3, R5, and current signal sends into the anti-phase scale amplifying of OP97 after becoming voltage signal.There is the gearshift of two places to arrange in this circuit, be respectively SW3 and SW4,4 kinds of gears can be had to select through different collocation.
signal generation module
Signal generation module major function generates the standard sine signal meeting designing requirement, this module is based on the DDS technical design of FPGA, and DDS (Direct Digital Synthesis) is that a kind of Direct Digital of applying is to produce the method for signal waveform.DDS technology is based upon on the basis of sampling thheorem, and first it sample, quantize the signal waveform needed, then stored in the data query table of storer as signal to be generated.When signal output waveform, from tables of data successively sense data, produce digital signal.
The frequency relation of input clock frequency and output waveform signals as shown in the figure.T in the drawings
orepresent the cycle of output waveform, T
cfor the sampling period, 2
nfor ROM question blank addressing range, K is frequency control word.T as shown in Figure 5
o=T
c* 2
n/ K, being converted to frequency can be expressed as
f o=
f c* K/2
n,
f cfor the frequency of clock signal clk.N=16 in the design, namely 2
n=65536, the therefore output frequency of signal
f o=
f c* K/65536.
preposition conditioning module
Preposition conditioning module, is also current-to-voltage converter, is connected with the digital to analog converter of front end signal generation module, for described current signal is transformed to voltage signal.Current/voltage-converted and I/V conversion are the voltage signals current signal of input being converted to satisfied certain relation, and suitable one of the voltage after conversion exports adjustable constant pressure source, and its output voltage should be able to keep stable and can not change with the change of load.As Fig. 6.
current signal generation module
Current signal generation module major function is, carries out phase-amplitude adjustment, and amplify the current signal that preposition conditioning module exports.
voltage signal generation module
Voltage signal generation module major function is, carries out phase-amplitude adjustment, and amplify the voltage signal that preposition conditioning module exports.
phase-amplitude condition module
In phase-amplitude adjustment module, amplitude amplification is completed by amplifier and miniature precision mutual inductor.Phase adjusted we have employed digital phase shift pattern, its function both can use hardware implementing, also can use software simulating.In digital drift-phase technology, signal is after carrying out sampling and AD conversion, send into FPGA and FFT conversion is carried out to input (feedback) signal, thus obtain range value and phase place, then to phase compare, and adopt digital proportional integral differential to control (digital PID), go to approach preset value by numerical evaluation.
Technical scheme of the present invention is by mature technology, is integrated in a blank field, makes this calibration equipment realize intelligent and high precision, avoids traditional approach to need the complicated circuit repeating to build.
In the inventive solutions, digital display and human-computer interface module specifically comprise: display screen, for showing option of operation and measurement data; Keyboard, for setting parameters.
Beneficial effect of the present invention is: the AC impedance of generator rotator calibration equipment of integrated use virtual impedance method design, the standard signal produced is by pin-point accuracy table Real-time Collection, and analogue transformation is become digital quantity, and feed back to the program control source of high stability and precision and revise in real time; The method approaches preset value as far as possible, thus meets AC impedance of generator rotator calibration equipment indices; Solve the problem that when verifying AC impedance of generator rotator in prior art, shortage special measurement utensil verifies it, can carry out the synchronous detection of pin-point accuracy to multinomial measurement functions such as the AC impedance of AC impedance of generator rotator, power, frequencies, the pin-point accuracy testing for AC impedance of generator rotator provides reliable method of testing and test foundation.
When the present invention detects AC impedance of generator rotator in prior art for solving, lack the problem that special verification utensil verifies it, from the principle of AC impedance of generator rotator, have developed the AC impedance of generator rotator calibration equipment based on high stability and precision, and this device should meet the needs that calibration detects completely, can verify current most domestic AC impedance of generator rotator.
Such as, the structural representation of a kind of AC impedance of generator rotator calibration equipment that Fig. 1 provides for the embodiment of the present invention, as shown in Figure 1, AC impedance of generator rotator calibration equipment specifically comprises: the program control source of pin-point accuracy table, high stability and precision, digital display and control module, inner each intermodule adopts serial mode communication, by the unified work controlling each module of the master control set in the program control source of high stability and precision, improve the global reliability of each module of AC impedance of generator rotator calibration equipment.
AC impedance of generator rotator calibration equipment principle of work based on dummy load method is: first set preset value by digital display and human-computer interface module, under the control of main control module, the program control source of high stability and precision provides initial value respectively to current output terminal and output voltage terminals, then pin-point accuracy table is had to measure in real time and feed back, real-time value is returned to the program control source of high stability and precision, take this as a foundation and approach step by step is carried out to the output quantity of calibration equipment, thus reach the object to output quantity correction.
The connection diagram of a kind of AC impedance of generator rotator calibration equipment that Fig. 2 provides for the embodiment of the present invention and AC impedance of generator rotator, the basic detection connection principle of AC impedance of generator rotator calibration equipment as shown in Figure 1.The current output terminal of AC impedance of generator rotator calibration equipment is connected to by the current output terminal of test examination instrument AC impedance of generator rotator, the voltage output end of ac impedance measurement instrument calibration equipment is connected to by the voltage input end of test examination instrument ac impedance measurement instrument, is adopted big current line to be connected with calibration equipment output terminal by between the pressure regulator input end of test examination instrument ac impedance measurement instrument.
What this calibration equipment adopted is dummy load method, and trial voltage, the test current of calibration equipment independently export, and the phase differential between them is adjustable, to simulate various load state.What ac impedance measurement instrument calibration equipment adopted is dummy load method, and trial voltage, the test current of calibration equipment independently export, and the phase differential between them is adjustable, to simulate various load state.
In sum, the invention provides a kind of AC impedance of generator rotator calibration equipment based on virtual impedance method, solve when AC impedance of generator rotator being detected in prior art, lack the problem that special calibration utensil verifies it, the synchro measure of pin-point accuracy can be carried out, for the pin-point accuracy testing of AC impedance of generator rotator provides technical conditions and practical basis to the AC impedance etc. of ac impedance measurement instrument.
Use ac impedance measurement instrument calibration equipment of the present invention effectively can screen out the quality of each producer each model ac impedance measurement instrument, reference frame can be provided for choosing of ac impedance measurement instrument and equipment from now on, also qualified and underproof criterion can be used for the detection of instrument and equipment as product.
Ac impedance measurement instrument calibration equipment of the present invention is also very useful for ac impedance measurement instrument manufacturer, can be used for the research in product development as test specimen; Also may be used for the comparison calibration in production run, as the testing tool of product export inspection, also can also will develop New function from now on, and be applied to field widely.
The blank detecting ac impedance measurement instrument filled up by ac impedance measurement instrument calibration equipment of the present invention, can promote carrying out of ac impedance measurement instrument testing.
Key problem in technology point of the present invention is: the program control source of high stability and precision that can obtain Real-time Feedback, and has the ability of data correction; Carry out at whole the last grade of calibration equipment voltage, the reometer meter that pin-point accuracy measures in real time, and become digital quantity after the analog signal processing that can collect and feed back to master control set.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. based on the AC impedance of generator rotator calibration equipment of dummy load method, it is characterized in that, comprise connect successively the first pin-point accuracy table, the program control source of high stability and precision, the second pin-point accuracy table and digital display and human-computer interface module, the current output terminal be connected with described first pin-point accuracy table and the program control source of high stability and precision respectively, and respectively with the output voltage terminals of the program control source of described high stability and precision and the second pin-point accuracy list catenation.
2. the AC impedance of generator rotator calibration equipment based on dummy load method according to claim 1, it is characterized in that, described first pin-point accuracy table, comprises the current sensor, the first Signal-regulated kinase, the first analog-to-digital conversion module and the first measuring and calculating module that are connected in turn between described current output terminal and the program control source of high stability and precision.
3. the AC impedance of generator rotator calibration equipment based on dummy load method according to claim 2, it is characterized in that, the program control source of described high stability and precision, comprise the master controller be connected with described digital display and human-computer interface module successively, signal generation module and preposition conditioning module, be connected to the current signal generation module between described preposition conditioning module and current output terminal in turn, first phase/amplitude adjustment module and the first amplifier, and the voltage signal generation module be connected in turn between described preposition conditioning module and output voltage terminals, second phase/amplitude adjustment module and the second amplifier.
4. the AC impedance of generator rotator calibration equipment based on dummy load method according to claim 3, it is characterized in that, described and pin-point accuracy table, comprise the voltage sensor, secondary signal conditioning module, the second analog-to-digital conversion module and the second measuring and calculating module that are connected in turn between described output voltage terminals and master controller.
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| CN201410509749.9A CN104316889A (en) | 2014-09-26 | 2014-09-26 | Virtual load method-based generator rotor alternating current impedance tester calibration device |
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| CN108732522A (en) * | 2017-04-21 | 2018-11-02 | 南京南瑞继保电气有限公司 | The test device and method of generator rotor interturn short-circuit fault monitoring device |
| CN111289929A (en) * | 2020-03-13 | 2020-06-16 | 深圳天溯计量检测股份有限公司 | Calibration method of alternating current resistance tester |
| CN111983323A (en) * | 2020-07-03 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for measuring resistance value of generator sealing tile by induction voltage method |
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Inventor after: Song Wei Inventor after: Zhou Wei Inventor after: Li Mei Inventor after: Song Wei, Zhou Wei, Limetajl Slavli, Huang Yousheng, Lei Min, Liu Zhiqiang, Luo Xuefang, Zhang Jun Inventor after: Huang Yousheng Inventor after: Lei Min Inventor after: Liu Zhiqiang Inventor after: Luo Xuefang Inventor after: Zhang Jun Inventor before: Song Wei Inventor before: Zhou Wei Inventor before: Li Mei Inventor before: Song Wei, Zhou Wei, Limetajl Slavli, Lei Min, Zhang Jun, Liu Zhiqiang, Luo Xuefang Inventor before: Lei Min Inventor before: Zhang Jun Inventor before: Liu Zhiqiang Inventor before: Luo Xuefang |
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