CN203551762U - Electronic instrument transformer and merging unit verification system - Google Patents
Electronic instrument transformer and merging unit verification system Download PDFInfo
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- CN203551762U CN203551762U CN201320703396.7U CN201320703396U CN203551762U CN 203551762 U CN203551762 U CN 203551762U CN 201320703396 U CN201320703396 U CN 201320703396U CN 203551762 U CN203551762 U CN 203551762U
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Abstract
The utility model relates to an electronic instrument transformer and merging unit verification system. The verification system comprises an electronic instrument transformer, a merging unit and a measurement and control apparatus. The electronic instrument transformer is connected with the measurement and control apparatus through the merging unit. Two ends of the electronic instrument transformer and the merging unit are connected with an electronic instrument transformer verification apparatus. Two ends of the merging unit are connected with a merging unit verification apparatus. The verification system achieves independent test and calibration of the error component of the electronic instrument transformer and the merging unit, is benefit for standardization and generalization of verification means as well as reducing the coupling degree between an electronic instrument transformer and a merging unit of various manufacturers.
Description
Technical field
The utility model relates to electric power check system, particularly relates to electronic mutual inductor and merge cells check system.
Background technology
Along with the construction of China's extra-high voltage grid and deepening constantly of power system reform, intelligent grid will become a new important directions of China's power network development.As the important component part of digital power system, digital transformer substation needs the mutual inductor of numeral output, needs the mutual inductor of Optical Fiber Transmission mode.Sensing accuracy, transmission light fibrillation and export the fast development that digitized mutual inductor main flow trend must cause electronic mutual inductor EIT (Electronic Instrument Transformer), it will become the important component part of image data in intelligent grid from now on.
The secondary output of electronic mutual inductor is different from traditional electromagnetic transformer, two kinds of EIT output patterns in GB/T20840.7-2007 and GB/T20840.8-2007, have clearly been stipulated: the analog quantity of small voltage signal and meet IEC 61850-9 form or the digital quantity of FT3 form, the output of this and traditional mutual inductor has difference in essence, and in electronic mutual inductor scheme, has also introduced brand-new merge cells (Merging Unit) equipment.Therefore, traditional transducer check mode and calibration equipment can not meet the verification of electronic mutual inductor and merge cells.
At present, etection theory and means for electronic mutual inductor and merge cells are still in the exploratory stage, enforceable national standard not yet forms, complete metering value transport system is set up not yet completely, also lack to the electronic mutual inductor of various types and merge cells all can be comprehensively, the general check system that effectively detects.Suggestive electronic mutual inductor measuring method has been proposed in GB/T20840.8-2007 appendix, but the method is a kind of whole measuring method, mutual inductor part and merge cells part are measured as a whole, can only measure the combined error of mutual inductor and merge cells, and cannot define respectively the performance error of mutual inductor and merge cells each several part, two parts cannot independently effectively be traced to the source, application limitation is very large, and the method, against the interchangeability principle of device, is measured conclusion and cannot be provided data foundation accurately for calibration and the replacing of device.We must seek a kind of verification mode that is suitable for electronic mutual inductor, easy to meet, quick, effectively, the verification accurately electronic mutual inductor and merge cells carried out.
And the electronic mutual inductor of the Ji great main flow producer of domestic use unrealized interconnecting property requirement, electronic mutual inductor, merge cells and mutual-inductor tester need support the use, and can not independent assortment.Cause the reason of this present situation to have a lot, mainly comprise: data rule is understood difference, be embodied in that parameter in data message is not put, the difference of field length; Transformer station demand is different, and different substation can arrange different port numbers to mutual inductor merge cells according to configuration file is different, causes data message length to differ, and impact is investigated the evidence of a case unpacking with data of instrument and extracted; Hardware configuration is different, and mutual inductor merge cells needs direct current supply or Alternating Current Power Supply, not yet unified, and optical fiber output adopts ST terminal or LC terminal, also variant.Based on above reason, the debugging of the electronic mutual inductor of each producer needs its supporting tester.
Summary of the invention
For above the deficiencies in the prior art, the utility model provides a kind of electronic mutual inductor and merge cells check system.
The purpose of this utility model is achieved through the following technical solutions:
Electronic mutual inductor and merge cells check system, this check system comprises electronic mutual inductor, merge cells and measure and control device, described electronic mutual inductor is connected with described measure and control device by merge cells, described electronic mutual inductor and the two ends of merge cells are connected with electronic transformer calibrator, and described merge cells two ends are connected with merge cells calibration equipment.
Described electronic transformer calibrator comprises programmable amplifying circuit, subtraction circuit, high speed frequency division sample circuit and high-speed a/d metering circuit, described programmable amplifying circuit is connected with described subtraction circuit, and described subtraction circuit is connected to control system by high speed frequency division sample circuit and high-speed a/d metering circuit.
Described electronic transformer calibrator also comprises mutual inductor merge cells, digital signal input device, and photoelectric signal transforming module, described mutual inductor merge cells is connected to control system by digital signal input device, photoelectric signal transforming module.
Described merge cells calibration equipment comprises interconnective monitoring means, benchmark MU emulator and EIT emulator
The utility model has the advantage of:
The test step by step method of this device, independent test and the calibration of electronic mutual inductor and merge cells error component have been realized, this will help lend some impetus to its verification means standardization, universalization, contribute to reduce the degree of coupling between each manufacturer's electronic mutual inductor and merge cells, break at present that equipment between each producer establishes one's own system, incompatible technology barriers, promote the sound and perfect of digital metering transmission of quantity value system.
Accompanying drawing explanation
Fig. 1: electronic mutual inductor and merge cells calibration equipment hardware system block diagram;
Fig. 2: electronic transformer calibrator hardware system block diagram;
Fig. 3: merge cells calibration equipment hardware system block diagram;
Fig. 4: ac small signal standard source theory diagram in merge cells calibration equipment;
Fig. 5: the synthetic reference signal source theory diagram of pin-point accuracy numeral;
Fig. 6: the power amplifier theory diagram of compound FEEDBACK CONTROL.
Embodiment
Be illustrated in figure 1 electronic mutual inductor and merge cells calibration equipment hardware system block diagram, this electronic mutual inductor and merge cells check system comprise electronic mutual inductor, merge cells and measure and control device, described electronic mutual inductor is connected with described measure and control device by merge cells, described electronic mutual inductor and the two ends of merge cells are connected with electronic transformer calibrator, and described merge cells two ends are connected with merge cells calibration equipment.
Be illustrated in figure 2 electronic transformer calibrator hardware system block diagram.For the electronic mutual inductor of simulation small-signal output, check system adopts potential differentiation to measure.When being measured as electronic current mutual inductor, adopt standard current transformer and measuring resistance; when being measured as electronic type voltage transformer, adopt standard potential transformer and inductive voltage divider; produce the specified secondary output voltage (there is identical no-load voltage ratio) identical with tested electronic mutual inductor; but its output accuracy than high two grades of tested electronic mutual inductor and more than; then by the output of standard mutual inductor and tested mutual inductor all connecting system carry out error of measurement calculating, obtain by the error of school mutual inductor.Checking electronic type transformers module You Si road analog AC signal input part, can directly input for the low-voltage simulation small-signal (as 150mV, 2V, 4V) of standard and tested mutual inductor; For the secondary current (1A or 5A) of standard current transformer or the secondary voltage of standard potential transformer (100V or
) also can directly input; When detecting traditional mutual inductor, for the rated secondary current (1A or 5A) of conventional current mutual inductor, need convert input validation instrument after normal voltage to by standard sample resistance.For the rated secondary voltage of conventional voltage mutual inductor (100V or
) need by voltage conversion apparatus (as inductive voltage divider) by rate conversion be required simulation small-signal (as
) etc. rear input.After all simulating signal input validation instrument, enter programmable amplifying circuit, programmable amplifying circuit is set its gain multiple according to the size of input signal, input signal is amplified to meet subsequent sampling treatment circuit and use.The checking electronic type transformers module of this Project design adds a self-correction circuit at analog signal channel, ratio and the angular difference of a standard of self-correction circuit output, monitor at any time the work on the spot state of tester, in order to guarantee accuracy and the reliability of tester measurement result.Standard and tested simulating signal enter subtraction circuit after programmable amplifying circuit, obtain the phasor difference of voltage/current.And sample for high-speed a/d metering circuit.Synchronizing signal is constant duration pulse signal, so high-speed a/d metering circuit can equidistantly sample the simulating signal of input, and converts in the industrial computer of digital signal input validation instrument.
Electronic mutual inductor for digital signal output; check system carries out A/D conversion by the secondary output of standard current transformer or voltage transformer (VT); receive tested mutual inductor through the digital output signal of merge cells simultaneously, by comparing and calculating, obtain by the error of school mutual inductor.
Checking electronic type transformers module supports that by merge cells, reading mutual inductor data also supports the digital signal of direct read electric formula mutual inductor to export.When reading by merge cells, correction verification module output synchronizing signal is extremely by school merging unit of electronic transformer, make tested mutual inductor in the digital signal of synchronization once sampling current/voltage value, by merge cells output port, send into the digital signal input end of tester.The digital signal of input is generally light signal, by tester inner exchanging machine, photosignal is converted to electric signal, then by network interface, inputs in the industrial computer of tester.Finally, industrial computer completes the functions such as data extraction, error calculating and result output.
Be illustrated in figure 3 merge cells calibration equipment hardware system block diagram.Whole test macro carries out scheduling controlling by the testing software that is installed on PC, according to testing requirement and scheme, 1, testing software controls merge cells verifying attachment and exports various numerals or simulation signal generator to tested MU, the various standard signals such as reference clock, 2, tested MU exports some digital quantities through inter-process after receiving various standard signals, 3, merge cells verifying attachment is synchronizeed with tested MU communication by port and is obtained the output voltage of tested MU, the digital quantities such as electric current are analyzed, 4, in the actual set output with merge cells verifying attachment, compare in PC computational analysis, finally obtain the time of tested MU, precision, the accurate transmitting accuracy of the indexs such as performance.
For merge cells, according to the pattern of its input quantity, check system can provide respectively the standard signals such as FT3 digital signal, millivolt level ac small signal and conventional volt-ampere level AC signal of standard, gather the digital signal output of the 61850-9 of tested merge cells simultaneously, by the comparison with standard signal and calculating, obtain by the error of school merge cells.
Ac small signal standard source part in merge cells calibration equipment, we have adopted usings the interchange reference signal of nine cross streams standard signal sources as complete machine.Sampling to output signal not only adopts amplitude get off, and also its phase place will be adopted, and we are referred to as perfect information sampling or the vector sampling of AC signal.Output signal compares (amplitude with the reference signal that exchanges in machine after vector sampling, phase bit comparison), by difference, control, the amplitude of output signal and the reference data that exchanges in the equal real-time follow-up machine of phase place like this, guaranteed the amplitude of output signal and phase place accurately.Its theory diagram is illustrated in fig. 4 shown below.
From above theory diagram 4, can find out, this standard source is mainly comprised of three parts: the synthetic nine phase reference signal source He San roads of pin-point accuracy numeral export, adopt compound FEEDBACK CONTROL with voltage, current power amplifier, the vector of sample circuit, to sample without phase voltage simultaneously.
(1) the synthetic nine phase reference signal source He San roads of pin-point accuracy numeral without phase voltage output principle block diagram as shown in Figure 5.Reference signal voltage U=E * sin (2 π f+φ) that the synthetic nine phase reference signal sources of pin-point accuracy numeral produce is that U traces DC reference voltage E by DC reference.The frequency f in nine phase signals sources directly trace internal frequency benchmark, by the oscillation frequency of constant temperature quartz oscillator, to frequency synthesizer, synthesizes needed frequency.When directlying trace, the phase place in nine phase signals sources cuts apart phase-shift circuit.We know that the accuracy of E can be better than 0.002%.The accuracy of f is better than 0.002Hz.The nine phase reference signal sources that formed thus can reach following technical indicator: Ua, Ub, and Uc, Ia, Ib, Ic, Ipa, Ipb, the range accuracy of Ipc can be better than 0.01% of range; Ua, Ub, Uc, Ia, Ib, Ic, Ipa, Ipb, be better than ± 0.002 degree of the phase place between Ipc.Above index is all indexs steady in a long-term, and we have just completed the foundation of nine phase datum quantities of a long time stability like this.
(2) voltage of compound FEEDBACK CONTROL band sampling, current power amplifier.Nine cross streams datum quantities must be amplified by power amplifier, just can make the voltage of output, and electric current has certain carrying load ability.Therefore it is very important designing a kind of power amplifier that does not add any error (mainly referring to range error and frequency error) in the amplification process of signal.In standard source, we have adopted the voltage of compound FEEDBACK CONTROL band sampling, and current power amplifier, is approximately desirable power amplifier.The voltage of compound FEEDBACK CONTROL band sample circuit, the following Fig. 6 of current power amplifier functional-block diagram.
Close FEEDBACK CONTROL amplifier principle of work: the interchange reference signal of being synthesized by high precision waveform generator is delivered to power amplifier through signal transmssion line by reference signal.In the process in transmission, high-precision AC reference signal can be responded to the high frequency electrical signal that a part is useless, so the prime at compound FEEDBACK CONTROL amplifier has been established one-level active low-pass filter circuit, (the medium-high frequency undesired signal filtering higher than more than 3KHz).Then filtered interchange reference signal is delivered to amplitude control circuit, amplitude control circuit mainly consists of 16 high accuracy number potentiometers, (the adjusting fineness of output electric weight thus circuit completes).Ac voltage signal after amplitude adjusted is delivered to the export ratio signal that comparer and agc circuit fetch by output terminal and is compared (agc circuit is mainly got the amplitude proportion signal of output quantity, phase signal and part high frequency electrical signal composition).Show that an error signal delivers to power amplifier front stage circuits and amplify and to remove driving power amplifying circuit.(power amplification circuit mainly completes and boosts or up-flow and power amplification).AC signal after power amplification circuit amplifies is connected to output terminal output, also delivers to after sampling module samples simultaneously and feeds back to vector sampling module.
The vector sampling of electric current and voltage: find from side circuit, the accuracy of reference signal Ui is not only depended in the accuracy of the final output valve Uo of standard source, and relevant with the scale-up factor of vector sampling.Because we are as reference signal with AC signal, it certainly leads to amplitude error and phase displacement error in amplification process, therefore require sampled signal must comprise this two errors, and the additive error that sampled signal brings must be very little, the voltage that just can make output, electric current and phase value are strictly followed the tracks of interchange benchmark.In voltage vector sampling, adopt the precision resistance of high stability, its temperature coefficient is 2ppm, ratio and angular difference can reach 0.002%.In current phasor sampling, adopt active compensation formula current transformer, can greatly reduce excitatory error like this.By precision resistance and high precision operating amplifier, form current/voltage conversion, make current transformer secondary work in approximate short-circuit condition, the voltage signal after I/V conversion has just reflected amplitude and the phase place of electric current, and ratio and angular difference that it is additional are better than 0.005%.
The verification of above-mentioned electronic mutual inductor and merge cells, adopts verification respectively, and all adopts very high standard to carry out the equipment of the low precision of verification, has determined very accurately by the measuring error of calibration device.And the method can realize by the metering of calibration equipment and transmitting.
Should be appreciated that the above detailed description of the technical solution of the utility model being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art modifies reading the technical scheme that can record each embodiment on the basis of the utility model instructions, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (4)
1. electronic mutual inductor and merge cells check system, it is characterized in that, this check system comprises electronic mutual inductor, merge cells and measure and control device, described electronic mutual inductor is connected with described measure and control device by merge cells, described electronic mutual inductor and the two ends of merge cells are connected with electronic transformer calibrator, and described merge cells two ends are connected with merge cells calibration equipment.
2. electronic mutual inductor according to claim 1 and merge cells check system, it is characterized in that, described electronic transformer calibrator comprises programmable amplifying circuit, subtraction circuit, high speed frequency division sample circuit and high-speed a/d metering circuit, described programmable amplifying circuit is connected with described subtraction circuit, and described subtraction circuit is connected to control system by high speed frequency division sample circuit and high-speed a/d metering circuit.
3. electronic mutual inductor according to claim 2 and merge cells check system, it is characterized in that, described electronic transformer calibrator also comprises mutual inductor merge cells, digital signal input device, photoelectric signal transforming module, described mutual inductor merge cells is connected to control system by digital signal input device, photoelectric signal transforming module.
4. electronic mutual inductor according to claim 1 and merge cells check system, is characterized in that, described merge cells calibration equipment comprises interconnective monitoring means, benchmark MU emulator and EIT emulator.
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| CN201320703396.7U CN203551762U (en) | 2013-11-08 | 2013-11-08 | Electronic instrument transformer and merging unit verification system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558571A (en) * | 2013-11-08 | 2014-02-05 | 国家电网公司 | Calibration system of electronic transformer and merging unit |
| CN103995198A (en) * | 2014-05-22 | 2014-08-20 | 国家电网公司 | Analog input merging unit metering performance detection device and detection method thereof |
| CN104391264A (en) * | 2014-12-05 | 2015-03-04 | 上海市计量测试技术研究院 | System and method for checking multifunctional electronic transformer |
-
2013
- 2013-11-08 CN CN201320703396.7U patent/CN203551762U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558571A (en) * | 2013-11-08 | 2014-02-05 | 国家电网公司 | Calibration system of electronic transformer and merging unit |
| CN103995198A (en) * | 2014-05-22 | 2014-08-20 | 国家电网公司 | Analog input merging unit metering performance detection device and detection method thereof |
| CN104391264A (en) * | 2014-12-05 | 2015-03-04 | 上海市计量测试技术研究院 | System and method for checking multifunctional electronic transformer |
| CN104391264B (en) * | 2014-12-05 | 2018-08-14 | 上海市计量测试技术研究院 | Multi-function electronic transformer checking system and method for calibration |
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