CN105487034A - 0.05-level electronic transformer verification method and system - Google Patents

Abstract

The invention provides a 0.05-level electronic transformer verification method and system. The method comprises the steps of: synchronously obtaining sampling data of an electronic transformer to be detected and an analog-digital system; adopting an improved digital filtering algorithm to carry out digital filtering processing on the sampling data; adopting a zero-crossing detection method to extract fundamental frequency components of the sampling data respectively; according to a phase difference method, respectively obtaining the frequencies, phases, and amplitudes of the sampling data; and according to the frequencies, the phases and the amplitudes to calculate a phase error, a current error, a voltage error, and A kind uncertainty of the electronic transformer to be detected. According to the invention, an absolute measuring method is adopted to respectively obtain the digital output signals of the analog-digital system and the electronic transformer to be detected at the same time, and frequency, amplitude and phase comparison is directly carried out on the digital output signals, the accuracy of the verification is high, no time delay phenomenon exists, and the technical problems of poor verification effect and low accuracy in the prior art can be solved.

Description

A kind of 0.05 grade of method for checking electronic transducer and system

Technical field

The present invention relates to a kind of electrotechnical instrument and meter power calibration field, be specifically related to a kind of 0.05 grade of method for checking electronic transducer and system.

Background technology

Electronic mutual inductor is made up of the one or more voltage or current sensor being connected to transmission system and two times transfer device, is proportional to measured amount in order to transmission, supply surveying instrument, instrument and relay protection or control device.Electronic mutual inductor is mainly used in the electric parameter metering of electric system and all kinds of detection experiment and the efficiency evaluation and test inputing or outputing the electric equipment of frequency conversion electricity, is one of digitizing in intelligent grid, intelligentized key equipment.At present because the reliability and stability of electronic mutual inductor need perfect, cause electronic mutual inductor run time fault rate higher, become the bottleneck that it applies in electric system.Regulation in standard GB/T/T20840.7-2007 " electronic type voltage transformer " and GB/T20840.8-2007 " electronic current mutual inductor ", the electronic mutual inductor of digital transformer substation application is a kind of non-traditional mutual inductor of analog input digital output.But identical with traditional mutual inductor, electronic mutual inductor is also responsible for the accurate measurement of electrical network, and the substantial responsibility such as malfunction monitoring, therefore to the verification of electronic mutual inductor, accurately its error range of calibrating, tool is of great significance.

At present, the accuracy verification of electronic mutual inductor main in the conventional way based on, namely using the traditional standard mutual inductor containing iron core as standard source, the measurement to different size rated primary voltage electric current is realized by the mode gone between to iron core tapping, and pass through the analog-to-digital conversion module of electronic transducer calibration instrument inside, simulating signal is converted to digital signal, again the digital signal that itself and tested electronic mutual inductor export is contrasted, finally, differential technique analysis is adopted to draw error and phase difference data.

More than there is ferroresonance and ferromagnetic saturated defect in the verification mode of employing iron core type standard mutual inductor, increase-volume is difficult, secondary connection is loaded down with trivial details and the second open circuit problems such as Keep Clear-High Voltage, causes its weak effect to checking electronic type transformers, accuracy low.Meanwhile, traditional method of calibration mainly based on differential technique principle, by standard mutual inductor with done difference by the modulating output of school electronic mutual inductor, then process carried out to difference signal obtain ratio and angular difference.Compared with standard mutual inductor modulating output, it is discrete series that the numeral of electronic mutual inductor exports, therefore, if digital signal is converted to simulating signal to meet accuracy requirement with differential technique by being difficult to again, in addition, export the secondary device of electronic mutual inductor due to numeral and primary side exists time delay phenomenon, therefore, directly 2 road signals are directly done missionary society causes relatively large deviation, reduce further the accuracy of verification.

Summary of the invention

The invention provides a kind of 0.05 grade of method for checking electronic transducer and system, to solve the weak effect verified in prior art, the technical matters that accuracy is low.

The invention provides a kind of 0.05 grade of method for checking electronic transducer, described 0.05 grade of method for checking electronic transducer comprises: synchronous acquisition electronic mutual inductor to be measured and analog quantity turn the sampled data of digital quantity system; Adopt improvement digital filtering algorithm to carry out digital filtering process to described sampled data, and export described digital filtering process data; Zero crossing detection is adopted to extract the fundamental component of described sampled data respectively; The frequency of described sampled data, phase place and amplitude is obtained respectively according to phase difference method; The phase error of electronic mutual inductor to be measured, current error, voltage error and category-A uncertainty is calculated according to described frequency, described phase place and described amplitude.

Preferably, described improvement digital filtering algorithm comprises: set up the queue that is held N number of data; Described sampled data is inputted described queue, and judges that whether described queue is full; If described queue less than, then described sampled data is exported, and repeats the step that judges that whether described queue full; If described queue is full, then remove the maximal value in described queue and minimum value, and ask for the arithmetic mean of residue N-2 data, described arithmetic mean is exported, and repeat the step that judges that whether described queue is full.

Preferably, described improvement digital filtering algorithm also comprises: sort according to bubble sort method to described sampled data; Store maximal value and minimum value in described queue.

Preferably, 0.05 grade of method for checking electronic transducer also comprises: structure Blackman-Harris window function; Digital filtering process data according to the process of Blackman-Harris window function, obtain and revise data.

Preferably, 0.05 grade of method for checking electronic transducer also comprises: arrange sampled point quantity according to Shannon's theorems.

The present invention also provides a kind of 0.05 grade of electronic type transformer checking system, described 0.05 grade of electronic type transformer checking system comprises: sampled data acquisition module, and described sampled data acquisition module is used for synchronously acquisition electronic mutual inductor to be measured and analog quantity and turns the sampled data of digital quantity system; Digital filtering processing module, described digital filtering processing module carries out digital filtering process for adopting improvement digital filtering algorithm to described sampled data; Fundamental component extraction module, the fundamental component of described fundamental component extraction module for adopting zero crossing detection to extract described sampled data respectively; Frequency, phase place and amplitude acquisition module, described frequency, phase place and amplitude acquisition module are used for obtaining the frequency of described sampled data, phase place and amplitude respectively according to phase difference method; Phase error, current error, voltage error and category-A uncertainty calculation module, described phase error, current error, voltage error and category-A uncertainty calculation module are used for calculating the phase error of electronic mutual inductor to be measured, current error, voltage error and category-A uncertainty according to described frequency, described phase place and described amplitude.

Preferably, described digital filtering processing module comprises: sub-submodule is set up in queue, and described queue sets up submodule for setting up the queue that is held N number of data; Queue input submodule, described queue input submodule is used for described sampled data to input described queue, and judges that whether described queue is full; Sampled data output sub-module, described sampled data output sub-module be used for when described queue less than time, described sampled data is exported, and repeats the step that judges that whether described queue full; Arithmetic mean output sub-module, described arithmetic mean output sub-module is used for when described queue is expired, remove the maximal value in described queue and minimum value, and ask for the arithmetic mean of residue N-2 data, described arithmetic mean is exported, and repeats the step that judges that whether described queue is full.

Preferably, described digital filtering processing module also comprises: sampled data sorting sub-module, and described sampled data order module is used for sorting according to bubble sort method to described sampled data; Sub module stored, described sub module stored is for storing maximal value and minimum value in described queue.

Preferably, described 0.05 grade of electronic type transformer checking system also comprises: Blackman-Harris window function constructing module, and described Blackman-Harris window function constructing module is for constructing Blackman-Harris window function; Revise data acquisition module, described correction data acquisition module is used for digital filtering process data according to the process of Blackman-Harris window function, obtains and revises data.

Preferably, described 0.05 grade of electronic type transformer checking system also comprises: sampled point quantity arranges module, and described sampled point quantity arranges module for arranging sampled point quantity according to Shannon's theorems.

The present invention also provides another kind of 0.05 grade of electronic type transformer checking system, described 0.05 grade of electronic type transformer checking system comprises: verification standard source, analog quantity turns digital quantity system, electronic mutual inductor to be measured, electronic transducer calibration instrument, wherein, one end of described electronic mutual inductor to be measured is electrically connected described verification standard source, and the other end of described electronic mutual inductor to be measured is electrically connected described electronic transducer calibration instrument; One end that described analog quantity turns digital quantity system is electrically connected described verification standard source, and the other end that described analog quantity turns digital quantity system is electrically connected described electronic transducer calibration instrument; Described electronic transducer calibration instrument also comprises: Error processing system, and described Error processing system is electrically connected described analog quantity respectively and turns digital quantity system and described electronic mutual inductor to be measured.

The technical scheme that embodiments of the invention provide can comprise following beneficial effect:

The invention provides a kind of 0.05 grade of method for checking electronic transducer, described 0.05 grade of method for checking electronic transducer comprises: synchronous acquisition electronic mutual inductor to be measured and analog quantity turn the sampled data of digital quantity system; Improvement digital filtering algorithm is adopted to carry out digital filtering process to described sampled data; Zero crossing detection is adopted to extract the fundamental component of described sampled data respectively; The frequency of described sampled data, phase place and amplitude is obtained respectively according to phase difference method; The phase error of electronic mutual inductor to be measured, current error, voltage error and category-A uncertainty is calculated according to described frequency, described phase place and described amplitude.The present invention is based on the absolute method of measurement, first synchronous acquisition electronic mutual inductor to be measured and analog quantity turn the sampled data of digital quantity system, namely at synchronization, obtain analog quantity respectively and turn digital quantity system and the electricity to be measured digital output signal of formula mutual inductor, and described digital output signal is directly carried out to the comparison of frequency, amplitude and phase place.Be different from differential technique, this method directly carries out digitized sampling to simulating signal, and compare without the need to converting digital signal to simulating signal, the accuracy of verification is high, real-time again, there is not time delay phenomenon.Therefore, the present invention can solve the weak effect verified in prior art, the technical matters that accuracy is low.

Should be understood that, it is only exemplary and explanatory that above general description and details hereinafter describe, and can not limit the present invention.

Accompanying drawing explanation

Fig. 1 is the process flow diagram of a kind of 0.05 grade of method for checking electronic transducer provided in the embodiment of the present invention;

Fig. 2 is the process flow diagram of the step S02 provided in the embodiment of the present invention;

Fig. 3 is the process flow diagram of the step S204 provided in the embodiment of the present invention;

Fig. 4 is the process flow diagram of the another kind 0.05 grade of method for checking electronic transducer provided in the embodiment of the present invention;

Fig. 5 is the structural representation of a kind of 0.05 grade of electronic type transformer checking system provided in the embodiment of the present invention;

Fig. 6 is the structural representation of the digital filtering processing module provided in the embodiment of the present invention;

Fig. 7 is the structural representation of the arithmetic mean output sub-module provided in the embodiment of the present invention;

Fig. 8 is the structural representation of the another kind 0.05 grade of electronic type transformer checking system provided in the embodiment of the present invention;

Fig. 9 is the structural representation of the third the 0.05 grade of electronic type transformer checking system provided in the embodiment of the present invention.

Embodiment

Here will be described exemplary embodiment in detail, its sample table shows in the accompanying drawings.When description below relates to accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawing represents same or analogous key element.Embodiment described in following exemplary embodiment does not represent all embodiments consistent with the present invention.On the contrary, they only with as in appended claims describe in detail, the example of device that aspects more of the present invention are consistent.

Each embodiment in this instructions all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiment.

Please refer to Fig. 1, the process flow diagram of a kind of 0.05 grade of method for checking electronic transducer provided in the embodiment of the present invention is provided.

As shown in Figure 1, a kind of 0.05 grade of method for checking electronic transducer, described 0.05 grade of method for checking electronic transducer comprises: synchronous acquisition electronic mutual inductor to be measured and analog quantity turn the sampled data of digital quantity system; Adopt improvement digital filtering algorithm to carry out digital filtering process to described sampled data, and export described digital filtering process data; Zero crossing detection is adopted to extract the fundamental component of described sampled data respectively; The frequency of described sampled data, phase place and amplitude is obtained respectively according to phase difference method; The phase error of electronic mutual inductor to be measured, current error, voltage error and category-A uncertainty is calculated according to described frequency, described phase place and described amplitude.

Usually, the input signal of verification standard source, except containing except fundametal compoment, also contains higher harmonic components and white noise etc.Generally there are two aspects in the source of interference volume, and one is the higher hamonic wave of electric system, and one is electromagnetic interference (EMI) and the noise of environment.Check system design interference protection measure mainly comprises the interference protection measures such as portion link shielding, system earth, acquisition circuit design low-pass filter.Therefore, carry out to sampled data the steps necessary that digital filtering process is checking electronic type transformers, digital filtering process is conducive to improving checking precision.The improvement digital filtering algorithm provided in the present embodiment improves on the basis of sliding average filtering algorithm, arithmetic mean filter method and anti-impulse disturbances average filter method, is more applicable for specific temperature data collecting system.

The present embodiment adopts the zero crossing detection of similar triangle theory to extract the fundamental component of described sampled data, the method requires that waveform has to pass through digital filtering process, the interference of filtering direct current and harmonic wave accurately could differentiate zero crossing, and 10 computation of Period frequencies of then adopting international standards to specify make Estimation of Mean.

What provide in the present embodiment utilizes phase difference method to obtain the frequency of described sampled data, phase place and amplitude to be respectively specially:

Utilize interpolated FFT algorithm to analyze the parameter of each harmonic respectively, concrete formula is as follows:

$|X_H\left(e^{j\mathrm{\ω}}\right){|}_{\mathrm{\ω}=k_m\frac{2\mathrm{\π}}{N}}=|W_H(k_m-(k_m+{\mathrm{\δ}}_m\left)\right)\frac{2\mathrm{\π}}{N}|\≈\frac{A_{m}sin\left({\mathrm{\π\δ}}_m\right)}{\[2{\mathrm{\π\δ}}_m(1-{\mathrm{\δ}}_m^2)\]}$

$|X_H\left(e^{j\mathrm{\ω}}\right){|}_{\mathrm{\ω}=(k_m+1)\frac{2\mathrm{\π}}{N}}=|W_H(k_m+1-(k_m+{\mathrm{\δ}}_m\left)\right)\frac{2\mathrm{\π}}{N}|\≈\frac{A_{m}sin\left({\mathrm{\π\δ}}_m\right)}{\[2{\mathrm{\π\δ}}_m(1-{\mathrm{\δ}}_m^2)(2-{\mathrm{\δ}}_m)\]}$

The value that can be derived from the amplitude of signal, phase place and frequency is respectively:

$A_m=|X_H\left(e^{j\mathrm{\ω}}\right){|}_{\mathrm{\ω}=k_m\frac{2\mathrm{\π}}{N}}=\frac{\[2{\mathrm{\π\δ}}_m(1-{\mathrm{\δ}}_m^2)\]}{\sin \left({\mathrm{\π\δ}}_m\right)}$

f _m＝m·(k ₁+δ ₁)f _s/N

In formula, m is overtone order, f _sfor sample frequency, k _mfor the discrete frequency that harmonic signal sample sequence is corresponding, δ _mfor frequency spectrum departs from estimated value, and 0≤δ _m<1, X _hfor sampled point, W _hfor rectangular window.

In the present embodiment, calculate the phase error of electronic mutual inductor to be measured, current error, voltage error and category-A uncertainty according to described frequency, described phase place and described amplitude and be specially:

Phase error

In formula, for phase differential, the nominal phase produced because of technology for electronic mutual inductor is poor, and f is frequency, t _drthe ratings of data processing and transmission required time.

Current error ε _i:

${\mathrm{\&epsiv;}}_i=\frac{K_r\&CenterDot;I_s-I_p}{I_p}\&times;100\%$

In formula: K _rspecified change, I _psignal source electric current, I _sfor under measuring condition, actual secondary current during applying.

Voltage error ε _u:

${\mathrm{\&epsiv;}}_u=\frac{K_r{U}_s-U_p}{U_p}\&times;100\%$

In formula, K _rfor rated voltage ratio, U _pfor signal source voltage, U _sfor under measuring condition, actual secondary voltage during applying.

Category-A uncertainty:

$u_a=S\left(x_k\right)=\sqrt{\frac{1}{n-1}\underset{k=1}{\overset{n}{\&Sigma;}}{(x_k-\stackrel{\&OverBar;}{x})}^2}$

In formula, x is the voltage/current value measured, and n-1 is degree of freedom.

The present invention is based on the absolute method of measurement, first synchronous acquisition electronic mutual inductor to be measured and analog quantity turn the sampled data of digital quantity system, namely at synchronization, obtain analog quantity respectively and turn digital quantity system and the electricity to be measured digital output signal of formula mutual inductor, and described digital output signal is directly carried out to the comparison of frequency, amplitude and phase place.Be different from differential technique, this method directly carries out digitized sampling to simulating signal, and compare without the need to converting digital signal to simulating signal, the accuracy of verification is high, real-time again, there is not time delay phenomenon.Therefore, the present invention can solve the weak effect verified in prior art, the technical matters that accuracy is low.

Please refer to Fig. 2, the process flow diagram of the step S02 provided in the embodiment of the present invention is provided.

As shown in Figure 2, described improvement digital filtering algorithm comprises: set up the queue that is held N number of data; Described sampled data is inputted described queue, and judges that whether described queue is full; If described queue less than, then described sampled data is exported, and repeats the step that judges that whether described queue full; If described queue is full, then remove the maximal value in described queue and minimum value, and ask for the arithmetic mean of residue N-2 data, described arithmetic mean is exported, and repeat the step that judges that whether described queue is full.

Please refer to Fig. 3, the process flow diagram of the step S204 provided in the embodiment of the present invention is provided.

As shown in Figure 3, described improvement digital filtering algorithm also comprises: sort according to bubble sort method to described sampled data; Store maximal value and minimum value in described queue.

The present invention adopts improvement digital filtering algorithm to carry out digital filtering process to sampled data, digital filtering algorithm after improvement to the effect that first set up a queue, real-time output can be realized, that is data of often coming in will export data at once, can ensure real-time and the rapidity of data like this, that avoids occurring in the middle of pure method of arithmetical average will gather repeatedly data and filtering could export the situation of data.When after queue full, hot target temperature constantly rises, come in also can abandon while a new data data of " always " at every turn, make the length that whole queue remains fixing, after data of often coming in, judge whether these data are maximal value or minimum value, first remove maximal value and minimum value when carrying out filtering algorithm.We give tacit consent to these two values for interference value, then remaining data acquisition arithmetic mean method and median filtering algorithm compound filter, by just can export after calculating one after filtering after data.

Please refer to Fig. 4, the process flow diagram of the another kind 0.05 grade of method for checking electronic transducer provided in the embodiment of the present invention is provided.

As shown in Figure 4, described 0.05 grade of method for checking electronic transducer also comprises: structure Blackman-Harris window function; Digital filtering process data according to the process of Blackman-Harris window function, obtain and revise data.

Blackman-Harris window is in fact a kind of Cosine Window of four term coefficient, and its time-domain expression is as follows:

$w_{Bh}\left(n\right)=0.35875-0.48829cos\left(\frac{2\mathrm{\&pi;}}{N}n\right)+0.14128cos\left(\frac{4\mathrm{\&pi;}}{N}n\right)-0.01168cos\left(\frac{6\mathrm{\&pi;}}{N}n\right)$

N=0 in formula, 1 ... N-1.

Frequency correction formula is:

f ₀＝k ₀Δf＝(α+k1+0.5)Δf

Amplitude correction formula is:

A ₀＝(y ₁+y ₂)×(3.06539676+0.965559979α ²+0.163556α ⁴+0.1985α ⁶)/N

Phase only pupil filter formula is:

${\mathrm{\&phi;}}_0=\arg \&lsqb;\stackrel{\&OverBar;}{x}\left(k_i\mathrm{\&Delta;}f\right)\&rsqb;+\frac{\mathrm{\&pi;}}{2}-\mathrm{\&pi;}\&lsqb;\mathrm{\&alpha;}-0.5{(-1)}^i\&rsqb;$

Wherein, α=k ₀-k ₁-0.5 (α [∈-0.5,0.5])

K ₀for peak value frequency, at peak value frequency k ₀the neighbouring amplitude maximum obtained of sampling is respectively k with time maximum spectrum ₁and k ₂.

Y ₁=X (k ₁Δ f) and y ₂=X (k ₂Δ f), 0≤k ₀-k ₁≤ 1

With window function w (n), signal x (n) is processed, the expression formula of the discrete Fourier transformation of corrected signal after windowing can be obtained:

$\stackrel{\&OverBar;}{X}\left(k\mathrm{\&Delta;}f\right)=\frac{A_0}{2j}{e}^{{\mathrm{j\&phi;}}_0}w\&lsqb;\frac{2\mathrm{\&pi;}(k\mathrm{\&Delta;}f-f_0)}{f_s}\&rsqb;$

In formula, w (f) is w _bhthe continuous frequency spectrum of (n).

X (n) is with sample frequency f _suniform sampling discrete-time signal:

$x\left(n\right)=A_{0}sin(2\mathrm{\&pi;}\frac{f_0}{f_s}n+{\mathrm{\&phi;}}_0)$

Further, described 0.05 grade of method for checking electronic transducer also comprises: arrange sampled point quantity according to Shannon's theorems.

Sampled point refers to the instantaneous voltage or momentary current that are sampled, and sampling number refers to signal sampling number per second.Sample frequency will meet Shannon's theorems in theory, and engineering will be that fast change or slow change are determined according to signal, and electric current, voltage are all fast changed signals, and therefore sample frequency wants high, is generally about 4k.

Please refer to Fig. 5, the structural representation of a kind of 0.05 grade of electronic type transformer checking system provided in the embodiment of the present invention is provided.

As shown in Figure 5, described 0.05 grade of electronic type transformer checking system comprises:

Sampled data acquisition module, described sampled data acquisition module is used for synchronously acquisition electronic mutual inductor to be measured and analog quantity and turns the sampled data of digital quantity system;

Digital filtering processing module, described digital filtering processing module carries out digital filtering process for adopting improvement digital filtering algorithm to described sampled data;

Fundamental component extraction module, the fundamental component of described fundamental component extraction module for adopting zero crossing detection to extract described sampled data respectively;

Frequency, phase place and amplitude acquisition module, described frequency, phase place and amplitude acquisition module are used for obtaining the frequency of described sampled data, phase place and amplitude respectively according to phase difference method;

Phase error, current error, voltage error and category-A uncertainty calculation module, described phase error, current error, voltage error and category-A uncertainty calculation module are used for calculating the phase error of electronic mutual inductor to be measured, current error, voltage error and category-A uncertainty according to described frequency, described phase place and described amplitude.

Please refer to Fig. 6, the structural representation of the digital filtering processing module provided in the embodiment of the present invention is provided.

As shown in Figure 6, described digital filtering processing module comprises:

Sub-submodule is set up in queue, and described queue sets up submodule for setting up the queue that is held N number of data;

Queue input submodule, described queue input submodule is used for described sampled data to input described queue, and judges that whether described queue is full;

Sampled data output sub-module, described sampled data output sub-module be used for when described queue less than time, described sampled data is exported, and repeats the step that judges that whether described queue full;

Arithmetic mean output sub-module, described arithmetic mean output sub-module is used for when described queue is expired, remove the maximal value in described queue and minimum value, and ask for the arithmetic mean of residue N-2 data, described arithmetic mean is exported, and repeats the step that judges that whether described queue is full.

Please refer to Fig. 7, the structural representation of the arithmetic mean output sub-module provided in the embodiment of the present invention is provided.

As shown in Figure 7, sampled data sorting sub-module, described sampled data order module is used for sorting according to bubble sort method to described sampled data;

Sub module stored, described sub module stored is for storing maximal value and minimum value in described queue.

Please refer to Fig. 8, the structural representation of the another kind 0.05 grade of electronic type transformer checking system provided in the embodiment of the present invention is provided.

As shown in Figure 8, described 0.05 grade of electronic type transformer checking system also comprises:

Blackman-Harris window function constructing module, described Blackman-Harris window function constructing module is for constructing Blackman-Harris window function;

Revise data acquisition module, described correction data acquisition module is used for digital filtering process data according to the process of Blackman-Harris window function, obtains and revises data.

Further, described 0.05 grade of electronic type transformer checking system also comprises: sampled point quantity arranges module, and described sampled point quantity arranges module for arranging sampled point quantity according to Shannon's theorems.

Please refer to Fig. 9, the structural representation of the third the 0.05 grade of electronic type transformer checking system provided in the embodiment of the present invention is provided.

As shown in Figure 9, described 0.05 grade of electronic type transformer checking system comprises: verification standard source 101, and analog quantity turns digital quantity system 102, electronic mutual inductor to be measured 103, electronic transducer calibration instrument 104, wherein,

One end of described electronic mutual inductor to be measured 103 is electrically connected described verification standard source 101, and the other end of described electronic mutual inductor 103 to be measured is electrically connected described electronic transducer calibration instrument 104;

One end that described analog quantity turns digital quantity system 102 is electrically connected described verification standard source 101, and the other end that described analog quantity turns digital quantity system 102 is electrically connected described electronic transducer calibration instrument 104;

Described electronic transducer calibration instrument 104 also comprises: Error processing system 105, and described Error processing system 105 is electrically connected described analog quantity respectively and turns digital quantity system 102 and described electronic mutual inductor to be measured 103.

The present embodiment lieutenant colonel tests the standard source that standard source 101 is Luo-coil; Analog quantity turns digital quantity system 102 by Ethernet and electronic transducer calibration instrument 104 transmission of digital signals; Error processing system 105 is for utilizing 0.05 grade of method for checking electronic transducer process sampled data provided by the invention.

Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any amendment done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Each embodiment in this instructions all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiment.

For convenience of description, various unit is divided into describe respectively with function when describing above device.Certainly, the function of each unit can be realized in same or multiple software and/or hardware when implementing of the present invention.

Each embodiment in this instructions all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for device or system embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.Apparatus and system embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.

Be understandable that, the present invention can be used in numerous general or special purpose computing system environment or configuration.Such as: personal computer, server computer, handheld device or portable set, laptop device, multicomputer system, system, set top box, programmable consumer-elcetronics devices, network PC, small-size computer, mainframe computer, the distributed computing environment comprising above any system or equipment etc. based on microprocessor.

The present invention can describe in the general context of computer executable instructions, such as program module.Usually, program module comprises the routine, program, object, assembly, data structure etc. that perform particular task or realize particular abstract data type.Also can put into practice the present invention in a distributed computing environment, in these distributed computing environment, be executed the task by the remote processing devices be connected by communication network.In a distributed computing environment, program module can be arranged in the local and remote computer-readable storage medium comprising memory device.

Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any amendment done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

The above is only the specific embodiment of the present invention, those skilled in the art is understood or realizes the present invention.To be apparent to one skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (11)

1. 0.05 grade of method for checking electronic transducer, is characterized in that, described 0.05 grade of method for checking electronic transducer comprises:

Synchronous acquisition electronic mutual inductor to be measured and analog quantity turn the sampled data of digital quantity system;

Adopt improvement digital filtering algorithm to carry out digital filtering process to described sampled data, and export described digital filtering process data;

Zero crossing detection is adopted to extract the fundamental component of described sampled data respectively;

The frequency of described sampled data, phase place and amplitude is obtained respectively according to phase difference method;

The phase error of electronic mutual inductor to be measured, current error, voltage error and category-A uncertainty is calculated according to described frequency, described phase place and described amplitude.

2. 0.05 grade of method for checking electronic transducer according to claim 1, is characterized in that, described improvement digital filtering algorithm comprises:

Set up the queue that is held N number of data;

Described sampled data is inputted described queue, and judges that whether described queue is full;

If described queue less than, then described sampled data is exported, and repeats the step that judges that whether described queue full;

If described queue is full, then remove the maximal value in described queue and minimum value, and ask for the arithmetic mean of residue N-2 data, described arithmetic mean is exported, and repeat the step that judges that whether described queue is full.

3. 0.05 grade of method for checking electronic transducer according to claim 2, is characterized in that, described improvement digital filtering algorithm also comprises:

Described sampled data is sorted according to bubble sort method;

Store maximal value and minimum value in described queue.

4. 0.05 grade of method for checking electronic transducer according to claim 1, is characterized in that, described 0.05 grade of method for checking electronic transducer also comprises:

Structure Blackman-Harris window function;

Digital filtering process data according to the process of Blackman-Harris window function, obtain and revise data.

5. 0.05 grade of method for checking electronic transducer according to claim 4, is characterized in that, described 0.05 grade of method for checking electronic transducer also comprises: arrange sampled point quantity according to Shannon's theorems.

6. 0.05 grade of electronic type transformer checking system, is characterized in that, described 0.05 grade of electronic type transformer checking system comprises:

Sampled data acquisition module, described sampled data acquisition module is used for synchronously acquisition electronic mutual inductor to be measured and analog quantity and turns the sampled data of digital quantity system;

Digital filtering processing module, described digital filtering processing module carries out digital filtering process for adopting improvement digital filtering algorithm to described sampled data;

Fundamental component extraction module, the fundamental component of described fundamental component extraction module for adopting zero crossing detection to extract described sampled data respectively;

Frequency, phase place and amplitude acquisition module, described frequency, phase place and amplitude acquisition module are used for obtaining the frequency of described sampled data, phase place and amplitude respectively according to phase difference method;

Phase error, current error, voltage error and category-A uncertainty calculation module, described phase error, current error, voltage error and category-A uncertainty calculation module are used for calculating the phase error of electronic mutual inductor to be measured, current error, voltage error and category-A uncertainty according to described frequency, described phase place and described amplitude.

7. 0.05 grade of electronic type transformer checking system according to claim 6, is characterized in that, described digital filtering processing module comprises:

Sub-submodule is set up in queue, and described queue sets up submodule for setting up the queue that is held N number of data;

Queue input submodule, described queue input submodule is used for described sampled data to input described queue, and judges that whether described queue is full;

Sampled data output sub-module, described sampled data output sub-module be used for when described queue less than time, described sampled data is exported, and repeats the step that judges that whether described queue full;

Arithmetic mean output sub-module, described arithmetic mean output sub-module is used for when described queue is expired, remove the maximal value in described queue and minimum value, and ask for the arithmetic mean of residue N-2 data, described arithmetic mean is exported, and repeats the step that judges that whether described queue is full.

8. 0.05 grade of electronic type transformer checking system according to claim 7, is characterized in that, described arithmetic mean output sub-module also comprises:

Sampled data sorting sub-module, described sampled data order module is used for sorting according to bubble sort method to described sampled data;

Sub module stored, described sub module stored is for storing maximal value and minimum value in described queue.

9. 0.05 grade of electronic type transformer checking system according to claim 6, is characterized in that, described 0.05 grade of electronic type transformer checking system also comprises:

Blackman-Harris window function constructing module, described Blackman-Harris window function constructing module is for constructing Blackman-Harris window function;

Revise data acquisition module, described correction data acquisition module is used for digital filtering process data according to the process of Blackman-Harris window function, obtains and revises data.

10. 0.05 grade of electronic type transformer checking system according to claim 8, it is characterized in that, described 0.05 grade of electronic type transformer checking system also comprises: sampled point quantity arranges module, and described sampled point quantity arranges module for arranging sampled point quantity according to Shannon's theorems.

11. 1 kinds of 0.05 grade of electronic type transformer checking systems, it is characterized in that, described 0.05 grade of electronic type transformer checking system comprises: verification standard source (101), analog quantity turns digital quantity system (102), electronic mutual inductor to be measured (103), electronic transducer calibration instrument (104), wherein

One end of described electronic mutual inductor to be measured (103) is electrically connected described verification standard source (101), and the other end of described electronic mutual inductor to be measured (103) is electrically connected described electronic transducer calibration instrument (104);

One end that described analog quantity turns digital quantity system (102) is electrically connected described verification standard source (101), and the other end that described analog quantity turns digital quantity system (102) is electrically connected described electronic transducer calibration instrument (104);

Described electronic transducer calibration instrument (104) also comprises: Error processing system (105), and described Error processing system (105) is electrically connected described analog quantity respectively and turns digital quantity system (102) and described electronic mutual inductor to be measured (103).