CN101706563A - Digital calibration system of partial discharge test equipment - Google Patents
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Abstract
The invention discloses a digital calibration system of partial discharge test equipment. The digital calibration system is characterized in that the system comprises a device to be tested, and a digital calibrator and a measurement and control computer of the partial discharge test equipment which is connected with the device to be tested, wherein the output end of the digital calibrator of the partial discharge test equipment is connected with the measurement and control computer; the measurement and control computer compares the collected waveform and data measured value with the standard value output by the digital calibrator to perform analysis and calculation and obtain the error of the measured value and the standard value, outputs the error value, and measured value and standard value to a data outputting machine so as to realize the calibration of the partial discharge test equipment. In the system of the invention, the wide measuring range which is 1-10000pc, the high accuracy standard pulse calibrator and a high speed data acquisition card with 12 bits of precision are adopted to ensure the calibration accuracy to reach +/-2%.
Description
Technical field
The invention discloses a kind of digital calibration system that is used for the calibration system of verification partial discharge test equipment and is used for on-the-spot partial discharge test equipment.
Background technology
Continuous development along with power electronic system and high voltage electric appliance, the renewal again that the revision of " measurement of partial discharge " is about to carry out along with the IEC standard, then the metering and the calibration of the test macro that local discharge test is used have proposed stricter, finer, new requirement, especially in the 1-10000PC scope, calibration accuracy is better than ± and 2% or the realization of higher digital modular system, demand urgently building up.
The method of calibration of using is at present, and calibration is opened by the cover plate of school partial discharge test system calibrating device, measures square-wave voltage value U
0, measure capacitance C again
0, calculate the Bureau of Standards that is exported by verification calibration pulse generator with formula and put the quantity of electric charge.Therefore, because of the influence of environment, lead-in wire, and change PC value in the time of might causing on-the-spot the use, cause the accuracy reduction.
Summary of the invention
The digital calibration system that the purpose of this invention is to provide a kind of partial discharge test equipment, this system with the simulated peak holding circuit measure partial discharge quantity, make accuracy be better than ± 2%, and generate the terminal document of measurement, calculating, conclusion automatically, be used for the digital calibration system of local discharge test test macro metering.
For reaching above-mentioned purpose, the technical scheme that the present invention implemented is: the digital calibration system of partial discharge test equipment, it is characterized in that, this system comprises: the digital calibrating device and the observing and controlling computing machine of device to be measured and the partial discharge test equipment that is connected with device to be measured respectively, and the output terminal of the digital calibrating device of partial discharge test equipment is electrically connected with the observing and controlling computing machine; After the standard value that the observing and controlling computing machine will be gathered the output of next waveform and DATA REASONING value and digital calibrating device compares, analyzes, calculates, obtain the error of measured value and standard value, and this error amount, measured value and standard value exported to data logger, thereby realize the calibration of partial discharge test equipment.
The digital calibrating device of described partial discharge test equipment comprises standard bands voltage signal generator, basic pulse generator, signal shaping amplifier, pulse PC holding circuit, single-chip microcomputer and the high-speed data acquisition card that is electrically connected mutually successively.
Described device to be measured is a pulse producer, and pulse producer output terminal one tunnel links to each other with signal shaping amplifier, pulse PC holding circuit, single-chip microcomputer successively, and wherein, another branch road of entering signal shaping amplifier is connected with single-chip microcomputer; Another road links to each other with high-speed data acquisition card; Single-chip microcomputer, high-speed data acquisition card are connected with the observing and controlling computing machine respectively.
Described device to be measured is an instrument for measuring partial discharge, instrument for measuring partial discharge one tunnel is electrically connected with frequency band voltage signal generator, basic pulse generator respectively, frequency band voltage signal generator, basic pulse generator are electrically connected with high-speed data acquisition card respectively, and high-speed data acquisition card links to each other with the observing and controlling computing machine again; Another road of instrument for measuring partial discharge is electrically connected with the observing and controlling computing machine; Different measured values and standard value are exported to computing machine.
Described signal shaping amplifier is taked the AD829 operational amplifier, is 2 grades of signal amplifiers.
Described pulse PC holding circuit is taked through AD829 operational amplifier and proportion resistor R
11After being connected in parallel again with proportion resistor R
8After being serially connected in the one-level amplifying circuit, the pulse voltage signal is converted to a d. c. voltage signal U who has linear relationship with the pulse signal amplitude, exports at output terminal B point by integrated holding circuit PKD01.
Described single-chip microcomputer takes C8051F021 type single-chip microcomputer to detect individual pulse conversion back voltage, and C8051F021 type single-chip microcomputer adopts CIP-51 microcontroller kernel.
Described high-speed data acquisition unit adopts the high-speed data acquisition card PCI-1712 with 12 precision.
The digital calibration steps of described partial discharge test equipment is characterized in that, this method comprises:
A, device pulse producer to be measured inputs to signal shaping amplifier with pulse signal, and one the tunnel is amplified to pulse PC holding circuit through signal shaping amplifier signal shaping, is converted to a direct current voltage signal and gives single-chip microcomputer after peak value keeps; Its another branch road directly gives single-chip microcomputer one look-at-me, and single-chip microcomputer is by the control of giving an order of observing and controlling computing machine; The pulse signal of giving the observing and controlling computing machine draws partial discharge quantity PC measured value after converting, this measured value again with the standard value of observing and controlling Computer Storage relatively, obtain error amount, and this error amount exported to data logger;
Another road of pulse producer directly exports pulse waveform to high-speed data acquisition card, high-speed data acquisition card compares rising, the negative edge limit value that pulse waveform rises, the negative edge measured value is exported to observing and controlling computing machine and its storage, the conclusion that obtains whether meeting the requirements, be error amount, and this error amount and rising, negative edge measured value are exported to data logger;
B, device to be measured is an instrument for measuring partial discharge, the frequency band voltage signal generator of the digital calibrating device of partial discharge test equipment and basic pulse generator are imported the standard signal of a frequency span, voltage magnitude and full sized pules to instrument for measuring partial discharge, and simultaneously this standard signal being inputed to high-speed data acquisition card, high-speed data acquisition card inputs to the observing and controlling computing machine with this standard value; The shelf depreciation tester is read the actual value of frequency span, voltage magnitude, pulse and directly defeated as going into to the observing and controlling computing machine on device to be measured simultaneously, compare in the standard value that itself and observing and controlling computing machine are write down, calculate error, this error amount is transported to data logger.
Beneficial effect of the present invention: 1) the present invention can realize the digitizing of partial discharge test system and computerize calibration by said system, has improved calibration efficiency.
Owing to adopted the output waveform that high speed data acquisition system can digital acquisition pulse, machine can directly be calibrated its shelf depreciation value after handling as calculated, existing collimation technique will be opened its shell and measure the method that its electric capacity and square-wave voltage value are carried out the calibration calculations error again, and efficient is improved.
2) owing to adopted the full sized pules calibrating device of wide-range scope 1-10000pc and pin-point accuracy and adopted high-speed data acquisition card with 12 precision, make calibration accuracy can reach ± 2%.
Description of drawings
Fig. 1 is the digital calibration system structured flowchart of this local discharge test device;
Fig. 2 is embodiment of the invention measuring impulse generator and instrument for measuring partial discharge's structured flowchart;
Fig. 3 is the signal shaping amplifier synoptic diagram;
Fig. 4 is a pulse PC holding circuit synoptic diagram.
Embodiment
The present invention will be further described below in conjunction with specific embodiment, and following embodiment only is used to illustrate the present invention, is not limited to practical range of the present invention.
As shown in Figure 1, it is one-piece construction block diagram of the present invention, this this system comprises: the digital calibrating device and the observing and controlling computing machine of device to be measured and the partial discharge test equipment that is connected with device to be measured respectively, and the output terminal of the digital calibrating device of partial discharge test equipment is electrically connected with the observing and controlling computing machine; After the standard value that the observing and controlling computing machine will be gathered the output of next waveform and DATA REASONING value and digital calibrating device compares, analyzes, calculates, obtain the error of measured value and standard value, and this error amount, measured value and standard value exported to data logger, thereby realize the calibration of partial discharge test equipment.
The present invention can carry out verification to the correction pulse generator that partial discharge test equipment and this equipment disposed, and all needs signal is gathered and handled in checking procedure.Signal input, front end isolation, shaping, conditioning, data acquisition, processing etc. are partially integrated in the anti-interference cabinet of a customization, and power supply has adopted measures such as isolation, filtering.
Integrated device is the digital calibrating device of partial discharge test equipment in the above-mentioned anti-interference cabinet, and the digital calibrating device of partial discharge test equipment comprises standard bands voltage signal generator, basic pulse generator, signal shaping amplifier, pulse PC holding circuit, single-chip microcomputer and the high-speed data acquisition card that is electrically connected mutually successively.
The concrete enforcement that Figure 2 shows that two devices to be measured of the present invention detects the calibration structure block diagram, and one of them device to be measured is a pulse producer, and the digital calibrating device of this pulse producer with the partial discharge test equipment of this system is connected.Device pulse producer to be measured inputs to signal shaping amplifier with pulse signal, and one the tunnel is amplified to pulse PC holding circuit through signal shaping amplifier signal shaping, is converted to a direct current voltage signal and gives single-chip microcomputer after peak value keeps; Its another branch road directly gives single-chip microcomputer one look-at-me, and single-chip microcomputer is by the control of giving an order of observing and controlling computing machine; The pulse signal of giving the observing and controlling computing machine draws partial discharge quantity PC measured value after converting, this measured value compares with observing and controlling Computer Storage standard value again, obtains error, and this error amount is exported to data logger;
Another road of pulse producer directly exports pulse waveform to high-speed data acquisition card, high-speed data acquisition card compares rising, the negative edge limit value that pulse waveform rises, the negative edge measured value is exported to observing and controlling computing machine and its storage, the conclusion that obtains whether meeting the requirements, be error amount, and this error amount and rising, negative edge measured value are exported to data logger;
Wherein another device to be measured is an instrument for measuring partial discharge, the frequency band voltage signal generator of the digital calibrating device of partial discharge test equipment and basic pulse generator are imported the standard signal of a frequency span, voltage magnitude and full sized pules to instrument for measuring partial discharge, and simultaneously this standard signal being inputed to high-speed data acquisition card, high-speed data acquisition card inputs to the observing and controlling computing machine with this standard value; The shelf depreciation tester is read the actual value of frequency span, voltage magnitude, pulse and directly defeated as going into to the observing and controlling computing machine on device to be measured simultaneously, compare in the standard value that itself and observing and controlling computing machine are write down, calculate error, this error amount is transported to data logger.
Frequency span and voltage magnitude generator use the dsp chip TMS320LF2407 (hereinafter to be referred as 2407) of TI company to produce PWM (Pulse Width Modulation) width modulation, this device has peripheral hardware integrated level height, the program storage capacity is big, A/D conversion accuracy height, the arithmetic speed height can reach the requirement of required frequency band and voltage signal.
The effect of buffer circuit is that the digital quantity that the PWM mouth is exported is cushioned, and voltage is drawn high 5V, uses for back level mimic channel filtering.
Level shifting circuit is converted to the 10V level signal with the 5V level signal.Low-pass filter circuit becomes to have the sinusoidal signal of 5V dc offset voltage with the pulsating volage conversion of signals of 10V.The main effect of subtraction circuit be the converting peak value to and be-5 of the sinusoidal signal that has the 5V dc offset voltage～+ sinusoidal ac signal of 5V, its voltage gain is 1.
Above-mentioned two devices to be measured do not detect simultaneously, and the digital calibrating device that connects partial discharge test equipment respectively detects, and its accuracy of detection can reach ± and 2%.
The effect of its accuracy standard of realization of the present invention is described below by this digital calibrating device physical circuit.
Figure 3 shows that the signal shaping amplifier synoptic diagram; As shown in Figure 3, signal is by U
InInput is through coupling capacitance C
i, C
4, proportion resistor R
11, R
4: R
5, R
7Form 2 grades of signal amplifiers with 2 AD829 operational amplifier A 1, the A2 of ADI company, its output signal is U
OutWherein, this operational amplifier is the AD829 amplifier of ADI company, and its bandwidth is that 120MHz, slewing rate are 230V/ μ S; And has low imbalance, characteristics such as low noise sound.
Figure 4 shows that pulse PC holding circuit synoptic diagram, as shown in Figure 4, behind the prime signal shaping amplifier, U
OutTo the input end A of peak holding circuit, through the AD829 of ADI company operational amplifier and proportion resistor R
11After being connected in parallel again with proportion resistor R
8After being serially connected in the one-level amplifying circuit, the PKD01 by integrated holding circuit ADI company is converted to a d. c. voltage signal U who has linear relationship with pulse signal to the pulse voltage signal again, and B just exports at output terminal.Can detect and keep the peak pulse signal quickly and accurately.
For the output that guarantees peak-holding circuit PKD01 is voltage after the conversion of current individual pulse, detect the voltage after the conversion of individual pulse with C8051F021 type single-chip microcomputer, C8051F021 type single-chip microcomputer uses CIP-51 microcontroller kernel, uses assembler and the compiler of standard 803x/805x to carry out software development.Utilize the A/D of the speed of C8051F021 and its 12bit to change to control integrator and the output of integrator is gathered, and give computing machine again the data that collect.
The signal after the shaping of being exaggerated by trial signal for the output signal of as shown in Figure 2 reference waveform generating means and tested device inputs to and grinds the high-speed data acquisition card PCI-1712 with 12 precision that magnificent company produces, the signal that collects is given computing machine again, after calculating data analysis, computing machine obtains the error of signal value and standard value, and signal value, standard value and error amount exported to data logger, thereby realize the calibration of partial discharge test equipment.
Claims (9)
1. the digital calibration system of partial discharge test equipment, it is characterized in that, this system comprises: the digital calibrating device and the observing and controlling computing machine of device to be measured and the partial discharge test equipment that is connected with device to be measured respectively, and the output terminal of the digital calibrating device of partial discharge test equipment is connected with the observing and controlling computing machine; After the standard value that the observing and controlling computing machine will be gathered the output of next waveform and DATA REASONING value and digital calibrating device compares, analyzes, calculates, obtain the error of measured value and standard value, and this error amount, measured value and standard value exported to data logger, thereby realize the calibration of partial discharge test equipment.
2. the digital calibration system of partial discharge test equipment as claimed in claim 1, it is characterized in that the digital calibrating device of described partial discharge test equipment comprises standard bands voltage signal generator, basic pulse generator, signal shaping amplifier, pulse PC holding circuit, single-chip microcomputer and the high-speed data acquisition card that is electrically connected mutually successively.
3. the digital calibration system of partial discharge test equipment as claimed in claim 1 or 2, it is characterized in that, described device to be measured is a pulse producer, pulse producer output terminal one tunnel links to each other with signal shaping amplifier, signal shaping amplifier, pulse PC holding circuit, single-chip microcomputer link to each other successively, wherein, another branch road of entering signal shaping amplifier output terminal is connected with single-chip microcomputer; Another road of pulse producer output terminal links to each other with high-speed data acquisition card; Single-chip microcomputer, high-speed data acquisition card are connected with the observing and controlling computing machine respectively.
4. the digital calibration system of partial discharge test equipment as claimed in claim 1, it is characterized in that, described device to be measured is an instrument for measuring partial discharge, instrument for measuring partial discharge one tunnel is electrically connected with frequency band voltage signal generator, basic pulse generator respectively, frequency band voltage signal generator, basic pulse generator are electrically connected with high-speed data acquisition card respectively, and high-speed data acquisition card links to each other with the observing and controlling computing machine again; Another road of instrument for measuring partial discharge is electrically connected with the observing and controlling computing machine; Then different measured values and standard value can be exported to computing machine.
5. the digital calibration system of a kind of partial discharge test equipment as claimed in claim 2 is characterized in that, described signal shaping amplifier is taked the AD829 operational amplifier, is 2 grades of signal amplifiers.
6. the digital calibration system of a kind of partial discharge test equipment as claimed in claim 2 is characterized in that, described pulse PC holding circuit is taked through AD829 operational amplifier and proportion resistor R
11After being connected in parallel again with proportion resistor R
8After being serially connected in the one-level amplifying circuit, the pulse voltage signal is converted to a d. c. voltage signal U who has linear relationship with the pulse signal amplitude, exports at output terminal B point by integrated holding circuit PKD01.
7. the digital calibration system of a kind of partial discharge test equipment as claimed in claim 2, it is characterized in that, described single-chip microcomputer takes C8051F021 type single-chip microcomputer to detect individual pulse conversion back voltage, and C8051F021 type single-chip microcomputer adopts CIP-51 microcontroller kernel.
8. the digital calibration system of a kind of partial discharge test equipment as claimed in claim 2 is characterized in that, described high-speed data acquisition unit adopts the high-speed data acquisition card PCI-1712 with 12 precision.
9. the digital calibration steps of a partial discharge test equipment is characterized in that, this method comprises:
A, device pulse producer to be measured inputs to signal shaping amplifier with pulse signal, and one the tunnel is amplified to pulse PC holding circuit through signal shaping amplifier signal shaping, is converted to a direct current voltage signal and gives single-chip microcomputer after peak value keeps; Its another road directly gives single-chip microcomputer one look-at-me, and single-chip microcomputer is by the control of giving an order of observing and controlling computing machine; The pulse signal of giving the observing and controlling computing machine draws partial discharge quantity PC measured value after converting, this measured value again with the standard value of observing and controlling Computer Storage relatively, obtain error amount, and this error amount exported to data logger;
Another road of pulse producer directly exports pulse waveform to high-speed data acquisition card, high-speed data acquisition card compares rising, the negative edge limit value that pulse waveform rises, the negative edge measured value is exported to observing and controlling computing machine and its storage, obtain fiducial value, and this fiducial value and rising, negative edge measured value are exported to data logger;
B, device to be measured is an instrument for measuring partial discharge, the frequency band voltage signal generator of the digital calibrating device of partial discharge test equipment and basic pulse generator are imported the standard signal of a frequency span, voltage magnitude and full sized pules to instrument for measuring partial discharge, and simultaneously this standard signal being inputed to high-speed data acquisition card, high-speed data acquisition card inputs to the observing and controlling computing machine with this standard value; Simultaneously the shelf depreciation tester is directly exported to the observing and controlling computing machine with the actual value of frequency span, voltage magnitude, pulse, and the standard value that itself and observing and controlling computing machine are write down compares again, calculates error, and this error amount is transported to data logger.
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| CN105548931A (en) * | 2015-12-04 | 2016-05-04 | 上海莫克电子技术有限公司 | Method for testing sensitivity of built-in sensor of gas insulation metal closed switch equipment |
| CN105510860A (en) * | 2016-01-28 | 2016-04-20 | 云南电网有限责任公司电力科学研究院 | Power frequency synchronization digital embedded partial discharge detector calibration system |
| CN105607023A (en) * | 2016-01-28 | 2016-05-25 | 云南电网有限责任公司电力科学研究院 | Pulse signal generation and measurement method for calibration of partial discharge detector |
| CN110927532A (en) * | 2019-10-29 | 2020-03-27 | 中国电力科学研究院有限公司 | Program-controlled integrated calibration method and system for ultrasonic partial discharge sensor |
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