CN104931782A - Remote asynchronous power frequency signal phase difference measurement method and system - Google Patents
Remote asynchronous power frequency signal phase difference measurement method and system Download PDFInfo
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- CN104931782A CN104931782A CN201510335334.9A CN201510335334A CN104931782A CN 104931782 A CN104931782 A CN 104931782A CN 201510335334 A CN201510335334 A CN 201510335334A CN 104931782 A CN104931782 A CN 104931782A
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Abstract
The invention relates to a remote asynchronous power frequency signal phase difference measurement method and system. The power frequency signal phase difference measurement method comprises the steps that first phase difference between a first measured power frequency signal and a city power reference signal and second phase difference between a second measured power frequency signal and the city power reference signal are acquired, and phase difference between first and second measured power frequency signals is acquired through first and second phase difference. According to the invention, remote asynchronous phase difference measurement is realized; the problem of inconvenient tow wire construction, which is caused by long distance between two measured signals in engineering application, is solved; defects of long distance signal transmission distortion are avoided; the construction difficulty of the measurement system based on a phase difference technology in the fields of power device state monitoring, signal acquisition and analysis, communication, automatic control and the like is reduced; and the quality of the relevant measurement system and the effectiveness of state determination are improved.
Description
Technical field
The present invention relates to a kind of method for measuring phase difference, particularly relate to a kind of long-range asynchronous power frequency component method for measuring phase difference and system.
Background technology
So-called power frequency component refers to the voltage/current periodic signal that frequency is 50Hz or 60Hz.The initial phase angle of so-called power frequency component, refer to for periodic signal f (t)=f (t+kT), wherein: k ∈ Z is integer, T is the cycle; Initial phase angle
in formula: t
0for from the nearest zero crossing of initial point; So-called power frequency component phase differential refers to the difference of two power frequency component initial phase angles.
The phase difference measurement of power frequency component is widely used in many fields such as signal analysis, parametric test circuit, electrotechnics, electric system.Conventional method for measuring phase difference can be divided into analogy aerotriangulation and digital photogrammetry two kinds, analogy aerotriangulation is directly carried out measurement to measured signal waveform or conversion waveform and is obtained phase information, and then the Serial No. that digital photogrammetry adopts digital sampling techniques to obtain measured signal carries out corresponding signal transacting and extract phase information.
During engineer applied, often there is distant situation in two tested power frequency components, as measure the Dielectric loss angle of capacitive apparatus, Zinc-Oxide Arrester current in resistance property time need to measure the voltage signal of bus-bar potential transformer PT and the current signal of equipment under test, at this moment conventional method is adopted to measure, drag line length, the easy loss of signal and disturbed, and engineering construction is comparatively complicated.
Summary of the invention
The object of this invention is to provide a kind of long-range asynchronous power frequency component method for measuring phase difference and system.
In order to solve the problems of the technologies described above, the invention provides a kind of long-range asynchronous power frequency component method for measuring phase difference, comprise: the first-phase potential difference obtaining the first tested power frequency component and civil power reference signal, and the second second-phase potential difference of tested power frequency component and civil power reference signal, and obtained the phase differential of first, second tested power frequency component by first, second phase differential.
Further, the acquisition methods of first, second phase differential described is identical, namely N number of sampled data of the first tested power frequency component, civil power reference signal is obtained by the mode of synchronized sampling at equal intervals, then corresponding N number of sampled data is obtained respectively to the humorous phase angle of first-harmonic of the first tested power frequency component, civil power reference signal respectively by harmonic analysis method, and the difference of the humorous phase angle of two first-harmonics is first-phase potential difference.
Further, the mode of described synchronized sampling at equal intervals, namely carries out synchronized sampling to measured signal, city's electric signal respectively in one-period, obtains described N number of sampled data, and sample frequency is fs=Nf, wherein N >=64.
Another aspect, in order to solve same technical matters, present invention also offers a kind of long-range asynchronous power frequency component phase Difference Measuring System.
This power frequency component phase Difference Measuring System, comprise: circuit structure and identical first, second two pass bands unit of function, first, second two pass bands unit described be suitable for obtaining respectively first, second tested power frequency component respectively with first, second phase differential of civil power reference signal, and first, second phase differential is sent to main processor modules, to obtain the phase differential of first, second tested power frequency component.
Further, described first two pass bands unit comprises: the channel C H1 signal conditioning circuit be suitable for the channel C H1 sample circuit of the tested power frequency component of connection first, being connected with described passage sample circuit, and be suitable for connecting civil power reference signal channel C H3 sampler, be connected with Measurement channel CH3 signal conditioning circuit with this channel C H3 sampler, and described channel C H1 signal conditioning circuit is connected with processor module respectively by synchronous ADC with channel C H3 signal conditioning circuit; Described processor module is suitable for the N number of sampled data being obtained the first tested power frequency component, civil power reference signal by the mode of synchronized sampling at equal intervals, then described N number of sampled data is obtained respectively to the humorous phase angle of first-harmonic of the first tested power frequency component and civil power reference signal by harmonic analysis method, and the difference of the humorous phase angle of two first-harmonics is first-phase potential difference.
The invention has the beneficial effects as follows, the measuring method of power frequency component phase differential of the present invention can realize long-range asynchronous phase difference measurement, solve two distant difficult problems of dragging line construction inconvenience of measured signal in engineer applied, avoid the drawback that long distance signal transmission distorts, thus reduce based on the difficulty of construction of the field measuring system such as the power equipment state monitoring of phase differential technology, signal collection and analysis, communication, automatically controls, the raising quality of related measuring system and the validity of condition adjudgement.The present invention contributes to the digital more accurate power frequency component phase information of acquisition in the field such as power equipment state monitoring, signal collection and analysis, communication, automatically control.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the process flow diagram of power frequency component method for measuring phase difference of the present invention;
Fig. 2 is the theory diagram of power frequency component phase Difference Measuring System of the present invention.
Embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present invention are described in a schematic way, and therefore it only shows the formation relevant with the present invention.
Nominal definition: so-called long-range the method that refers to does not need to drag line or wireless method just can the phase differential of measuring distance two power frequency components far away; So-called asynchronous referring to does not need the time above strictly to measure two power frequency components simultaneously.The method can obtain high-precision phase difference measurements, thus improves the quality of the field instrument and equipment such as power equipment state monitoring, signal collection and analysis, communication, automatically control based on phase differential technology.
Embodiment 1
As shown in Figure 1, the long-range asynchronous power frequency component method for measuring phase difference of one of the present invention, comprising:
Step S1, obtains first, second phase differential, namely obtains the first-phase potential difference of the first tested power frequency component and civil power reference signal
and the second second-phase potential difference of tested power frequency component and civil power reference signal
Step S2, obtains the phase differential of first, second tested power frequency component by first, second phase differential
namely
Concrete, the acquisition methods of first, second phase differential described is identical, namely obtained N number of sampled data of the first tested power frequency component, civil power reference signal by the mode of synchronized sampling at equal intervals, then to corresponding N number of sampled data respectively by harmonic analysis method obtain respectively the first tested power frequency component, civil power reference signal the humorous phase angle of first-harmonic namely
and the difference of the humorous phase angle of two first-harmonics is first-phase potential difference
namely
Further, the mode of described synchronized sampling at equal intervals, namely according to power frequency component frequency, in one-period, carries out synchronized sampling respectively to measured signal, city's electric signal, obtain described N number of sampled data, and sample frequency is fs=Nf, wherein N >=64.
Embodiment 2
On embodiment 1 basis, as shown in Figure 2, present invention also offers a kind of long-range asynchronous power frequency component phase Difference Measuring System, comprise: circuit structure and identical first, second two pass bands unit of function, first, second two pass bands unit described be suitable for obtaining respectively first, second tested power frequency component respectively with first, second phase differential of civil power reference signal, and first, second phase differential is sent to main processor modules, to obtain the phase differential of first, second tested power frequency component.
Concrete, described first two pass bands unit comprises: the channel C H1 signal conditioning circuit be suitable for the channel C H1 sample circuit of the tested power frequency component of connection first, being connected with described passage sample circuit, and be suitable for connecting civil power reference signal channel C H3 sampler, be connected with Measurement channel CH3 signal conditioning circuit with this channel C H3 sampler, and described channel C H1 signal conditioning circuit is connected with processor module respectively by synchronous ADC with channel C H3 signal conditioning circuit; Described processor module is suitable for the N number of sampled data being obtained the first tested power frequency component, civil power reference signal by the mode of synchronized sampling at equal intervals, then described N number of sampled data is obtained respectively to the humorous phase angle of first-harmonic of the first tested power frequency component and civil power reference signal by harmonic analysis method, and the difference of the humorous phase angle of two first-harmonics is first-phase potential difference.
Described second two pass bands unit adopts the structure same with the first two pass bands unit, and obtains second-phase potential difference by the processor module in this second two pass bands unit.
Embodiment 3
In embodiment 1 and embodiment 2 basis, expansion explanation is carried out to long-range asynchronous power frequency component method for measuring phase difference of the present invention and system.
The channel C H1 sample circuit of the first two pass bands unit connects the first tested power frequency component f
1t (), the channel C H2 sample circuit of the second two pass bands unit connects the second tested power frequency component f
2t (), the Measurement channel CH3 of first, second two pass bands unit all connects 220v civil power reference signal f
3(t);
First two pass bands unit is the tested power frequency component f of synchronized sampling first at equal intervals
1with civil power reference signal f
3n number of sampled data, then adopt harmonic analysis method to obtain the first tested power frequency component f to above-mentioned N number of sampled data
1(t) and civil power reference signal f
3the humorous phase angle of first-harmonic of (t)
with
basis again
calculate first-phase potential difference
Second two pass bands unit is adopted and is used the same method, i.e. the tested power frequency component f of synchronized sampling second at equal intervals
2(t) and civil power reference signal f
3t N number of sampled data of (), then adopts harmonic analysis method to obtain the second tested power frequency component f to above-mentioned N number of sampled data
2(t) and civil power reference signal f
3the humorous phase angle of first-harmonic of (t)
with
basis again
calculate phase differential
According to
calculate the first measured signal f
1(t) and the second measured signal f
2(t) phase differential
Further, described synchronized sampling is at equal intervals according to power frequency component (i.e. the first tested power frequency component f
1(t), the second tested power frequency component f
2(t), civil power reference signal f
3(t), and three is same frequency, only under same frequency, just can get phase differential) frequency f=50Hz or 60Hz, to the first tested power frequency component f
1(t), civil power reference signal f
3(t) at one-period inter-sync sampling N point, and in one-period, to the second tested power frequency component f
2(t), civil power reference signal f
3(t) synchronized sampling N point, namely sample frequency is fs=Nf, and N>=64; The present invention is without the need to carrying out synchronized sampling to three signals.Only need the first two pass bands unit, or carry out synchronized sampling in the second two pass bands unit and can obtain respective phase difference data.
With above-mentioned according to desirable embodiment of the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on instructions, must determine its technical scope according to right.
Claims (5)
1. a long-range asynchronous power frequency component method for measuring phase difference, is characterized in that, comprising:
Obtain the first-phase potential difference of the first tested power frequency component and civil power reference signal, and the second-phase potential difference of the second tested power frequency component and civil power reference signal, and the phase differential of first, second tested power frequency component is obtained by first, second phase differential.
2. power frequency component method for measuring phase difference according to claim 1, is characterized in that, the acquisition methods of first, second phase differential described is identical, namely
N number of sampled data of the first tested power frequency component, civil power reference signal is obtained by the mode of synchronized sampling at equal intervals, then corresponding N number of sampled data is obtained respectively to the humorous phase angle of first-harmonic of the first tested power frequency component, civil power reference signal respectively by harmonic analysis method, and the difference of the humorous phase angle of two first-harmonics is first-phase potential difference.
3. power frequency component method for measuring phase difference according to claim 2, it is characterized in that, the mode of described synchronized sampling at equal intervals, namely according to power frequency component frequency f, in one-period, respectively synchronized sampling is carried out to measured signal, city's electric signal, to obtain described N number of sampled data, and sample frequency is fs=Nf, wherein N >=64.
4. a long-range asynchronous power frequency component phase Difference Measuring System, is characterized in that, comprising: circuit structure and identical first, second two pass bands unit of function,
First, second two pass bands unit described is suitable for first, second phase differential obtaining first, second tested power frequency component and civil power reference signal respectively, and first, second phase differential is sent to main processor modules, to obtain the phase differential of first, second tested power frequency component.
5. power frequency component phase Difference Measuring System according to claim 4, is characterized in that,
Described first two pass bands unit comprises: the channel C H1 signal conditioning circuit be suitable for the channel C H1 sample circuit of the tested power frequency component of connection first, being connected with described passage sample circuit, and be suitable for connecting civil power reference signal channel C H3 sampler, be connected with channel C H3 signal conditioning circuit with this channel C H3 sampler, and described channel C H1 signal conditioning circuit is connected with processor module respectively by synchronous ADC with channel C H3 signal conditioning circuit;
Described processor module is suitable for the N number of sampled data being obtained the first tested power frequency component, civil power reference signal by the mode of synchronized sampling at equal intervals, then described N number of sampled data is obtained respectively to the humorous phase angle of first-harmonic of the first tested power frequency component and civil power reference signal by harmonic analysis method, and the difference of the humorous phase angle of two first-harmonics is first-phase potential difference.
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| CN115902400A (en) * | 2023-02-15 | 2023-04-04 | 保定正恒电力科技有限公司 | Measuring device and method for remote asynchronous angular difference based on metering chip |
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Application publication date: 20150923 |