CN104569896B - A kind of electronic current mutual inductor collecting unit digital signal configuration method - Google Patents
A kind of electronic current mutual inductor collecting unit digital signal configuration method Download PDFInfo
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Abstract
The invention discloses a kind of electronic current mutual inductor collecting unit digital signal configuration methods, and the standard value I of different stalls rated primary current is measured using current transformer collecting unit to be configuredX, obtain the digital quantity f (I) having functional relation with itX, further according to formula f (I)X·K0·KX=E makes the collecting unit output digit signals rated value E, K0For first order configuration coefficients, KXFor with the corresponding second level configuration coefficients of different stalls rated primary current, X represents different gear；According to the occasion that the current transformer is applied, by corresponding K0And KXIt is configured in the mutual inductor as preset parameter.The duplex configuration method of the present invention can ensure the high-precision that standard current transformer is measured in different stalls rated primary current, the precision configuration coefficients K being adapted simultaneously in the electronic loop that can more easily replace collecting unit in the case where ensureing required precision when something goes wrong, the collecting unit after only need to adjusting and replace0, it is not necessary to it repeats to calculate the gear COEFFICIENT K of different stallsX, realize adaptive calibration.
Description
Technical field
The invention belongs to intelligent substation fields, are related to a kind of electronic current mutual inductor collecting unit digital signal configuration
Method.
Background technology
With the development of intelligent grid, electronic current mutual inductor is obtained as the key equipment in intelligent substation
It is more and more widely used, stability and reliability are related to the healthy, quick of intelligent grid, sane development, receive electricity
Lixing more and more extensive concern in the industry.
Electronic current mutual inductor mostly makees primary current signal using the novel sensor progress of disease, such as Rogowski coil, LPCT, magnetic
Light glass, polarization maintaining optical fibre etc..At present, based on the accuracy verification of electronic current mutual inductor is in the conventional way, i.e., to contain
The traditional standard current transformer of iron core meets different stalls volume as standard source by the way of to iron core tapping lead
Determine the measurement of primary current, by the analog-to-digital conversion module inside electronic transducer calibration instrument, the analog signal output it
Dress is changed to digital signal, then be compared with the digital signal of tested electronic mutual inductor, obtains error and phase difference data.It is this
Using the verification mode of iron core type standard current transformer there are ferromagnetic resonance and ferromagnetic saturation defect, increase-volume is difficult, secondary connects
Line is cumbersome and second open circuit the problems such as Keep Clear-High Voltage.
With the continuous progress of industrial technology, using advanced process and multilayer screen technology, Rogowski coil is small
Progress of disease precision can reach 0.02 grade under the conditions of range, because of the advantages such as it also has wide range of measurement, and frequency response is wide, make to be based on
The electronic current mutual inductor of Rogowski coil is more and more widely used in New Generation of Intelligent substation.And it is to ensure sieve
Family name's coil precision is lossless, is not easy to realize that Rogowski coil measures different rated primary currents using the tap mode of connection, then
It just needs to be configured by adjusting collecting unit inside, realizes measurement of the Rogowski coil to different rated primary currents.
Invention content
The object of the present invention is to provide a kind of electronic current mutual inductor collecting unit digital signal configuration method, to meet
The requirement of precision and stability when being measured using standard Rogowski coil to different rated primary currents.
In order to achieve the goal above, the technical solution adopted in the present invention is：A kind of electronic current mutual inductor acquisition is single
First digital signal configuration method, includes the following steps：
(1) the standard value I of different stalls rated primary current is measured using current transformer collecting unit to be configuredX,
Obtain the digital quantity f (I) having functional relation with itX, further according to formula f (I)X·K0·KX=E makes collecting unit output number
Signal rated value E, wherein, K0For first order configuration coefficients, KXTo match with the corresponding second level of different stalls rated primary current
Coefficient is put, X represents different gears；
(2) occasion applied according to the current transformer, by corresponding K0And KXThe mutual inductance is configured to as preset parameter
In device.
First order configuration coefficients K0It is obtained by accuracy calibrating method.
It will be according to formula f (I) K0·KXThe corresponding second level configuration coefficients K of each gear that=E is obtainedXIt is stored in industry control
In machine, when the rated primary current to different stalls measures, correspondence is cured to by photoelectric conversion unit by industrial personal computer
In collecting unit.
Electromagnetic type standard current transformer is replaced to carry out electronic mutual inductor using Rogowski coil standard current transformer
During verification, due to iron-core-free inside Rogowski coil, not influenced by ferromagnetic resonance and magnetic saturation effect, dynamic is wide, wide range of measurement,
And progress of disease precision is high, anti-external magnetic field interference performance is strong.But it is still used to the calibration of the Rogowski coil standard current transformer
The method of the preceding tapped iron core standard mutual inductor of tradition, configuration coefficients during calibration only there are one, but the electronics of collecting unit
Circuit includes the multiple portions such as filtering, difference, integration, A/D samplings, easily breaks down, once electronic loop breaks down
It must just replace, just need to re-start calibration to the standard current transformer after replacement, configuration coefficients are adjusted.If
Calibration is not re-started, will influence the precision of the standard current transformer.
This problem of our deep study and analysis finds that reason goes out in configuration coefficients, the actually measurement of electronic circuit
Precision is restricted by two aspect factors, and one is precision configuration coefficients, the other is actual-gear coefficient.It is of the invention based on this
It proposes the duplex configuration mode to collecting unit, passes through configuration coefficients K0And KXMake output digit signals rated value for a rated value,
First order configuration can adjust collecting unit precision, its own accuracy be made to reach 0.02 grade, the second level is configured to adjustment not
It is matched with collecting unit under the conditions of rated primary current gear.Duplex configuration can ensure standard current transformer in difference
The high-precision that gear rated primary current measures, while can more easily replaced in the case where ensureing required precision when something goes wrong
The electronic loop of collecting unit, the precision configuration coefficients K that the collecting unit after only need to adjusting and replace is adapted0, it is not necessary to
Repeat the gear COEFFICIENT K of measuring and calculating different stallsX, realize adaptive calibration, use is more convenient.
For with respect to one configuration coefficients, the advantages of duplex configuration, is：(1) due to itself device of different electronic loops
There are error, level-one configuration coefficients K0It can ensure that different electronic loops can be derived that one when handling identical analog signal
Constant digital signal ensures the consistency of different electronic loops, electronics is replaced suitable for batch production and in failure
Two-level distribution COEFFICIENT K need not be changed behind circuitn, adaptive calibration；(2) two-level distribution COEFFICIENT KXRealize different primary currents
Wide scope measures, and ensures different stalls high-precision requirement；Compared to one configuration coefficients of (3) two configuration coefficients are more flexible, behaviour
The property made is also stronger, can meet the high-precision requirement as standard current transformer.
Description of the drawings
Fig. 1 is duplex configuration systematic schematic diagram；
Fig. 2 is the adjustable collecting unit Digital Signal Processing flow chart of duplex configuration；
Fig. 3 is man-machine program interface schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawings and the present invention is described further in specific embodiment.
The electric mutual inductor collecting unit configuration method of the present invention is generally used for based on Rogowski coil normalized current mutual inductance
In the electronic type transformer checking system of device, which includes the Primary Conductor across current lifting device, is worn in Primary Conductor
It is useful for the Rogowski coil standard current transformer of acquisition testing its electric current and tested electronic current mutual inductor, Rogowski coil mark
The signal output end of quasi- current transformer and tested electronic current mutual inductor passes through metering combining unit and the double standards of analog/digital
Signal access type electric mutual inductor tester connects, and the internal system transmission all digital information of signal, accuracy can reach
0.05 grade, meet related measurement criteria to standard mutual inductor accuracy requirement.
The Rogowski coil standard current transformer of the present invention is by standard Rogowski coil and the adjustable groups of acquisition units of duplex configuration
Into using standard Rogowski coil as standard source, progress of disease precision reaches 0.02 grade.According to faraday electromagnetic induction principle, standard
Rogowski coil generates the analog voltage signal proportional to specified primary measured current.By improve coil-winding technological level and
Multilayer screen technology, standard Rogowski coil provide high-precision analog voltage signal input source, specified electricity for subsequent acquisition unit
Flowing range can be by several ampere to tens of thousands of amperes etc..
The operation principle and process of the check system are as follows：Rogowski coil standard current transformer realizes rated primary current
Be converted to the function of standardized digital signal；Digital signal is transmitted through the optical fiber to metering combining unit, is converted to and meets
The metering digital signal of IEC61850-9-2-LE communication protocols；Metering digital signal is input to the double standard signal access type of analog/digital
Electric mutual inductor tester, by standard Rogowski coil current transformer digital signal and tested Electrical Instrument Transducers with Digital signal into
Row is compared, it can be achieved that tested electronic current mutual inductor than poor, difference accuracy verification.
Electronic current mutual inductor collecting unit digital signal duplex configuration system principle for the present invention as shown in Figure 1
Figure carries out dual match using the system to the digital signal for converting the analog signal of standard current transformer by collecting unit
It puts, configuration process includes the following steps：
(1) the standard value I of different stalls rated primary current is measured using current transformer collecting unit to be configuredX,
Obtain the digital quantity f (I) having functional relation with itX, further according to formula f (I)X·K0·KX=E makes collecting unit output number
Signal rated value E, wherein, K0For first order configuration coefficients, KXTo match with the corresponding second level of different stalls rated primary current
Coefficient is put, X represents different gears, and value is 1~n.The first order of collecting unit is configured to improve the precision of collecting unit,
Collecting unit itself accuracy is made to reach 0.02 grade；The second level is configured to the input of Parameter adjustable type, for completing collecting unit number
Word amount ratio adjusts, and meets the accuracy calibration under the conditions of different rated primary currents, makes different rated primary current gear items
Collecting unit is matched under part.
As shown in Fig. 2, the hardware components of the adjustable collecting unit of duplex configuration are mainly by filter circuit, differential loop, integration
Circuit, double A/D sampling circuit composition, after the analog signal that standard Rogowski coil exports is converted into digital signal, output and volume
Determine the digital quantity f (I) that primary current I has functional relation, then the two-stage coefficient of collecting unit is cured by configuration software
Adjustment, outputting standard digital signal.
The ratio difference minimal adjustment step-length of the present embodiment is 0.01%, and difference minimal adjustment step-length is 1 point.Wherein, the first order
Configuration coefficients K0It is certain value for each collecting unit, is obtained by accuracy calibrating method, and cures before manufacture in correspondence
The inside of collecting unit.
Second level configuration coefficients KXIt is unique match parameter corresponding to the specified primary test electric current of different stalls,
Its calculating process is as follows：Here it is 11585 to take digital signal rated value E, according to formula f (I)X·K0·KX=11585, it can obtain：
(2) occasion applied according to the current transformer, by corresponding K0And KXThe mutual inductance is configured to as preset parameter
In device.
It usually will be according to formula f (I) K0·KXThe corresponding second level configuration coefficients K of each gear that=E is obtainedXStorage
In industrial personal computer.When the rated primary current to different stalls measures, by selecting man-machine program interface on industrial personal computer
Testing current gear calls the configuration parameter that stores in industrial personal computer, it is cured to by photoelectric conversion unit to be configured mutual
In sensor collecting unit, it is switched fast during the test for a key of different rated primary current gears.
As shown in figure 3, the man-machine program interface of industrial personal computer is write using the graphical software program based on LABVIEW, it can
Configuration realizes software from ampere to tens of thousands of amperes of different primary current test gear selection keies and function menu key, " debugging pressure plate "
Initialization；" curing configuration " realizes that coefficient cures in collecting unit；" opening communication port " realizes port match；" exiting " is knot
Shu Benci is tested.The operation interface is directly facing user, simple to operation.Photoelectric conversion unit is mainly returned by photoelectric signal transformation
Road is formed, and by photoelectric signal transformation and is transmitted the adjustable collecting unit of duplex configuration and industrial computer data communication, realization pair
The allotment of coefficient in collecting unit.
Above example is only used for the core concept for helping to understand the present invention, it is impossible to the present invention is limited with this, for ability
The technical staff in domain, every thought according to the present invention modify or equivalently replace the present invention, in specific embodiment
And any change done in application range, it should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of electronic current mutual inductor collecting unit digital signal configuration method, which is characterized in that include the following steps：
(1) the standard value I of different stalls rated primary current is measured using current transformer collecting unit to be configuredX, obtain with
Its digital quantity f (I) having functional relationX, further according to formula f (I)X·K0·KX=E makes the collecting unit output digit signals volume
Definite value E, wherein, K0For first order configuration coefficients, KXIt is configured for the second level corresponding with different stalls rated primary current and is
Number, X represent different gears；
(2) occasion applied according to the current transformer, by corresponding K0And KXThe mutual inductor is configured to as preset parameter
In；
First order configuration coefficients are used to improve the precision of collecting unit；Second level configuration coefficients are inputted for Parameter adjustable type, are used for
The adjustment of collecting unit digital quantity ratio is completed, meets the accuracy calibration under the conditions of different rated primary currents, is made different specified
Collecting unit matches with the second level configuration coefficients under the conditions of primary current gear.
2. electronic current mutual inductor collecting unit digital signal configuration method according to claim 1, which is characterized in that
First order configuration coefficients K0It is obtained by accuracy calibrating method.
3. electronic current mutual inductor collecting unit digital signal configuration method according to claim 1 or 2, feature exist
In will be according to formula f (I) K0·KXThe corresponding second level configuration coefficients K of each gear that=E is obtainedXIt is stored in industrial personal computer,
When the rated primary current to different stalls measures, corresponding acquisition list is cured to by photoelectric conversion unit by industrial personal computer
In member.
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| CN106526518B (en) * | 2016-10-27 | 2019-01-25 | 中国西电电气股份有限公司 | A kind of accuracy of Rogowski coil proportionality coefficient and the calibration method of the linearity |
| CN112782575B (en) * | 2020-12-27 | 2021-12-14 | 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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