CN104569896A - Digital signal configuration method of acquisition unit of electronic current transformer - Google Patents
Digital signal configuration method of acquisition unit of electronic current transformer Download PDFInfo
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- CN104569896A CN104569896A CN201410757955.1A CN201410757955A CN104569896A CN 104569896 A CN104569896 A CN 104569896A CN 201410757955 A CN201410757955 A CN 201410757955A CN 104569896 A CN104569896 A CN 104569896A
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- collecting unit
- digital signal
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- acquisition unit
- current transformer
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Abstract
The invention discloses a digital signal configuration method of an acquisition unit of an electronic current transformer. The method comprises the steps of measuring standard values IX of rated primary current in different positions with the to-be-configured acquisition unit of the current transformer to obtain digital values f(I)X having a functional relationship with the standard values IX, allowing the acquisition unit to output a digital signal rated value E according to a formula f(I)X*K0*KX=E, and configuring corresponding K0 and KX into the transformer as fixed parameters according to an application occasion of the current transformer, wherein K0 is a first stage configuration coefficient, KX is secondary configuration coefficients corresponding to the rated primary current in different positions, and X represents the different positions. Double configuration method can ensure high measurement precision of the rated primary current in the different positions, an electronic circuit of the acquisition unit can be replaced more conveniently on the premise of meeting the precision requirement when a problem appears, only the precision configuration coefficient K0 is required to be adjusted to be adaptive to the replaced acquisition unit, the position coefficients KX of the different positions are not required to be measured and calculated, and self-adapting calibration is achieved.
Description
Technical field
The invention belongs to intelligent substation field, relate to a kind of electronic current mutual inductor collecting unit digital signal collocation method.
Background technology
Along with the development of intelligent grid, electronic current mutual inductor is as the key equipment in intelligent substation, obtain and apply more and more widely, its stability and reliability are related to the health of intelligent grid, quick, sane development, receive in power industry and pay close attention to more and more widely.
The progress of disease of electronic current mutual inductor many employings novel sensor makes primary current signal, as Luo-coil, LPCT, magneto-optic glass, polarization maintaining optical fibre etc.At present, electronic current mutual inductor accuracy verification be in the conventional way based on, namely using the traditional standard current transformer containing iron core as standard source, adopt the measurement mode of iron core tapping lead-in wire being met to different gear rated primary current, by the analog-to-digital conversion module of electronic transducer calibration instrument inside, the simulating signal dress exported is changed to digital signal, then compares with the digital signal of tested electronic mutual inductor, draws error and phase difference data.There is the loaded down with trivial details and second open circuit problems such as Keep Clear-High Voltage of ferroresonance and ferromagnetic saturated defect, increase-volume difficulty, secondary connection in the verification mode of this employing iron core type standard current transformer.
Along with the continuous progress of industrial technology, adopt advanced process and multilayer screen technology, Luo-coil progress of disease precision under small-range condition can reach 0.02 grade, because of it, also to have measurement range wide, the advantages such as frequency response is wide, make the electronic current mutual inductor based on Luo-coil obtain in New Generation of Intelligent transformer station and apply more and more widely.And be ensure that Luo-coil precision can't harm, not easily adopt the tap mode of connection to realize Luo-coil to different rated primary current and measure, so just need, by the inside configuration of adjustment collecting unit, to realize the measurement of Luo-coil to different rated primary current.
Summary of the invention
The object of this invention is to provide a kind of electronic current mutual inductor collecting unit digital signal collocation method, precision when different rated primary current being measured with satisfied employing standard Luo-coil and the requirement of stability.
In order to realize above object, the technical solution adopted in the present invention is: a kind of electronic current mutual inductor collecting unit digital signal collocation method, comprises the steps:
(1) current transformer collecting unit to be configured is utilized to measure the standard value I of different gear rated primary current
x, obtain the digital quantity f (I) had functional relation with it
x, then according to formula f (I)
xk
0k
x=E makes this collecting unit output digit signals ratings E, wherein, and K
0for first order configuration coefficients, K
xfor the second level configuration coefficients corresponding from different gear rated primary current, X represents different gears;
(2) according to the occasion that this current transformer is applied, by the K of correspondence
0and K
xbe configured in this mutual inductor as preset parameter.
First order configuration coefficients K
0drawn by accuracy calibrating method.
Will according to formula f (I) K
0k
xthe second level configuration coefficients K that each gear that=E obtains is corresponding
xbeing stored in industrial computer, when measuring the rated primary current of different gear, being cured in corresponding collecting unit by photoelectric conversion unit by industrial computer.
When adopting Luo-coil standard current transformer to replace electromagnetic type standard current transformer to carry out the verification of electronic mutual inductor, due to the inner iron-core-free of Luo-coil, do not affect by ferroresonance and magnetic saturation effect, dynamically wide, measurement range is wide, and high, the anti-external magnetic field interference performance of progress of disease precision is strong.But the method for traditional tapped iron core standard mutual inductor before the demarcation of this Luo-coil standard current transformer is still adopted, the configuration coefficients of timing signal only has one, but the electronic loop of collecting unit includes multiple parts such as filtering, difference, integration, A/D sampling, easily break down, break down once electronic loop and just must change, just need after changing to re-start demarcation to this standard current transformer, configuration coefficients is adjusted.If do not re-start demarcation, the precision of this standard current transformer will be affected.
Our this problem of deep study and analysis, finds that reason goes out in configuration coefficients, and in fact the measuring accuracy of electronic circuit is by the restriction of two aspect factors, and one is precision configuration coefficients, and another is actual-gear coefficient.Based on this, the present invention proposes the duplex configuration mode to collecting unit, by configuration coefficients K
0and K
xmake output digit signals ratings be a ratings, first order configuration can adjust collecting unit precision, makes himself accuracy reach 0.02 grade, and under the second level is configured for the different rated primary current gear condition of adjustment, collecting unit matches with it.Duplex configuration can ensure the high precision that standard current transformer is measured at different gear rated primary current, simultaneously can ensure the electronic loop changing collecting unit under accuracy requirement more easily when going wrong, only need adjust with change after the precision configuration coefficients K that adapts of collecting unit
0, the gear COEFFICIENT K calculating different gear need not be repeated
x, realize adaptive calibration, use more for convenience.
A relative configuration coefficients, the advantage of duplex configuration is: (1) exists error, one-level configuration coefficients K due to self device of different electronic loops
0can ensureing that different electronic loops can draw a constant digital signal when processing identical simulating signal, namely ensureing the consistance of different electronic loop, being applicable to batch production, and change when fault after electronic loop without the need to changing two-level distribution COEFFICIENT K
n, adaptive calibration; (2) two-level distribution COEFFICIENT K
xthe wide region achieving different primary current is measured, and ensures different gear high-precision requirement; (3) two configuration coefficients is more flexible compared to a configuration coefficients, operability is also stronger, can meet the high-precision requirement as standard current transformer.
Accompanying drawing explanation
Fig. 1 is duplex configuration systematic schematic diagram;
Fig. 2 is duplex configuration adjustable collecting unit digital signal processing process flow diagram;
Fig. 3 is man-machine program interface schematic diagram.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described further.
Electric mutual inductor collecting unit collocation method of the present invention is generally applied in the electronic type transformer checking system based on Luo-coil standard current transformer, this check system comprises the Primary Conductor through current lifting device, Primary Conductor is equipped with the Luo-coil standard current transformer for its electric current of acquisition testing and tested electronic current mutual inductor, Luo-coil standard current transformer is connected with mould/several pairs of standard signal access type electric mutual inductor testers by metering merge cells with the signal output part of tested electronic current mutual inductor, this internal system signal transmission is all numerical information, accuracy can reach 0.05 grade, meet relevant measurement standard to standard mutual inductor accuracy requirement.
Luo-coil standard current transformer of the present invention is made up of standard Luo-coil and the adjustable collecting unit of duplex configuration, and adopt standard Luo-coil as standard source, progress of disease precision reaches 0.02 grade.According to faraday electromagnetic induction principle, standard Luo-coil produces the analog voltage signal proportional with specified primary measured current.By improving coil-winding technological level and multilayer screen technology, standard Luo-coil provides high-precision analog voltage signal input source for subsequent acquisition unit, and rated current scope can by several amperes to the training of several Wan An not etc.
Principle of work and the process of this check system are as follows: Luo-coil standard current transformer realizes the function that rated primary current is converted to standardized digital signal; Digital signal to metering merge cells, is converted to the metering digital signal meeting IEC61850-9-2-LE communication protocol through Optical Fiber Transmission; Metering digital signal is input to mould/several pairs of standard signal access type electric mutual inductor testers, standard Luo-coil current transformer digital signal and tested Electrical Instrument Transducers with Digital signal are compared, can realize tested electronic current mutual inductor ratio, difference accuracy verification.
Be illustrated in figure 1 electronic current mutual inductor collecting unit digital signal duplex configuration systematic schematic diagram of the present invention, adopt this system to carry out duplex configuration to the digital signal simulating signal of standard current transformer changed by collecting unit, its layoutprocedure comprises the steps:
(1) current transformer collecting unit to be configured is utilized to measure the standard value I of different gear rated primary current
x, obtain the digital quantity f (I) had functional relation with it
x, then according to formula f (I)
xk
0k
x=E makes this collecting unit output digit signals ratings E, wherein, and K
0for first order configuration coefficients, K
xfor the second level configuration coefficients corresponding from different gear rated primary current, X represents different gears, and value is 1 ~ n.The first order of collecting unit is configured for the precision improving collecting unit, makes collecting unit self accuracy reach 0.02 grade; The second level is configured to the input of Parameter adjustable type, and for completing the adjustment of collecting unit digital quantity ratio, meet the accuracy calibration under different rated primary current condition, under making different rated primary current gear condition, collecting unit matches with it.
As shown in Figure 2, the hardware components of duplex configuration is adjustable collecting unit is primarily of filter circuit, differential loop, integrating network, double A/D sampling circuit composition, after the simulating signal that standard Luo-coil exports is converted into digital signal, export the digital quantity f (I) had functional relation with rated primary current I, adjustment is cured, outputting standard digital signal again by the two-stage coefficient of configuration software to collecting unit.
The ratio minimal adjustment step-length of the present embodiment is 0.01%, and difference minimal adjustment step-length is 1 point.Wherein, first order configuration coefficients K
0be certain value for each collecting unit, drawn by accuracy calibrating method, and before dispatching from the factory, solidify the inside in corresponding collecting unit.
Second level configuration coefficients K
xbe and the unique matching parameter corresponding to a specified measuring current of different gear, its computation process is as follows: getting digital signal ratings E is here 11585, according to formula f (I)
xk
0k
x=11585, can obtain:
(2) according to the occasion that this current transformer is applied, by the K of correspondence
0and K
xbe configured in this mutual inductor as preset parameter.
Generally by according to formula f (I) K
0k
xthe second level configuration coefficients K that each gear that=E obtains is corresponding
xbe stored in industrial computer.When measuring the rated primary current of different gear, by selecting man-machine program interface testing current gear on industrial computer, call the configuration parameter stored in industrial computer, it is cured in mutual inductor collecting unit to be configured by photoelectric conversion unit, switches fast for a key of different rated primary current gear in test process.
As shown in Figure 3, the man-machine program interface of industrial computer adopts to be write based on the graphical software program of LABVIEW, configurablely trains different primary current test gear options button and function menu key from ampere to a little Wan An, and " debugging pressure plate " realizes software initialization; " solidification configuration " realizes coefficient and solidifies in collecting unit; " open communication port " and realize port match; " exit " as terminating this test.The direct user oriented of this operation interface, simple to operation.Photoelectric conversion unit is formed primarily of photoelectric signal transformation loop, by photoelectric signal transformation and be transmitted the adjustable collecting unit of duplex configuration and industrial computer data communication, realizes the allotment to coefficient in collecting unit.
Above embodiment only understands core concept of the present invention for helping; the present invention can not be limited with this; for those skilled in the art; every according to thought of the present invention; the present invention is modified or equivalent replacement; any change done in specific embodiments and applications, all should be included within protection scope of the present invention.
Claims (3)
1. an electronic current mutual inductor collecting unit digital signal collocation method, is characterized in that, comprise the steps:
(1) current transformer collecting unit to be configured is utilized to measure the standard value I of different gear rated primary current
x, obtain the digital quantity f (I) had functional relation with it
x, then according to formula f (I)
xk
0k
x=E makes this collecting unit output digit signals ratings E, wherein, and K
0for first order configuration coefficients, K
xfor the second level configuration coefficients corresponding from different gear rated primary current, X represents different gears;
(2) according to the occasion that this current transformer is applied, by the K of correspondence
0and K
xbe configured in this mutual inductor as preset parameter.
2. electronic current mutual inductor collecting unit digital signal collocation method according to claim 1, is characterized in that: first order configuration coefficients K
0drawn by accuracy calibrating method.
3. electronic current mutual inductor collecting unit digital signal collocation method according to claim 1 and 2, is characterized in that: will according to formula f (I) K
0k
xthe second level configuration coefficients K that each gear that=E obtains is corresponding
xbeing stored in industrial computer, when measuring the rated primary current of different gear, being cured in corresponding collecting unit by photoelectric conversion unit by industrial computer.
Priority Applications (1)
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|---|---|---|---|
| CN201410757955.1A CN104569896B (en) | 2014-12-11 | 2014-12-11 | A kind of electronic current mutual inductor collecting unit digital signal configuration method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410757955.1A CN104569896B (en) | 2014-12-11 | 2014-12-11 | A kind of electronic current mutual inductor collecting unit digital signal configuration method |
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| Publication Number | Publication Date |
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| CN104569896A true CN104569896A (en) | 2015-04-29 |
| CN104569896B CN104569896B (en) | 2018-06-15 |
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Cited By (2)
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| CN106526518A (en) * | 2016-10-27 | 2017-03-22 | 中国西电电气股份有限公司 | Calibration method for calibrating accuracy and linearity of Rogowski coil proportionality coefficient |
| CN112782575A (en) * | 2020-12-27 | 2021-05-11 | 常熟开关制造有限公司(原常熟开关厂） | Current measuring device for circuit breaker, maintenance and correction method of current measuring device and intelligent circuit breaker |
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| CN112782575A (en) * | 2020-12-27 | 2021-05-11 | 常熟开关制造有限公司(原常熟开关厂） | Current measuring device for circuit breaker, maintenance and correction method of current measuring device and intelligent circuit breaker |
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| CN104569896B (en) | 2018-06-15 |
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