CN107102208B - A kind of measurement method and device of impulse earthed resistance - Google Patents
A kind of measurement method and device of impulse earthed resistance Download PDFInfo
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- CN107102208B CN107102208B CN201710279073.2A CN201710279073A CN107102208B CN 107102208 B CN107102208 B CN 107102208B CN 201710279073 A CN201710279073 A CN 201710279073A CN 107102208 B CN107102208 B CN 107102208B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
Abstract
The embodiment of the present invention provides the measurement method and device of a kind of impulse earthed resistance, be related to Lightning Prevention Technique field, solve the problems, such as to occur in the prior art entire current loop impedance difference can cause output current waveform it is different caused by the resistance value of the impulse earthed resistance measured do not have the property of can refer to.This method comprises: the continuous current input signal of fundamental frequency frequency sweep to grounding body injected frequency from lightning current to highest frequency；The voltage responsive sequence and output current-responsive sequence of grounding body are measured at different frequencies；The current-responsive sequence of output is modified to obtain the first current-responsive sequence of constant amplitude, and the voltage responsive sequence of measurement is modified according to the first current-responsive sequence of the current-responsive sequence of output and constant amplitude, obtain first voltage response sequence；The impulse earthed resistance that sequence determines grounding body is unfolded according to the first current-responsive sequence and first voltage response sequence and lightning current waveform frequency spectrum of constant amplitude.
Description
Technical field
The present invention relates to Lightning Prevention Technique field more particularly to the measurement methods and device of a kind of impulse earthed resistance.
Background technique
Impulse earthed resistance is when flowing through earthing or grounding means to the electric current of certain specific waveforms, on the earthing or grounding means produced by
Voltage condition a kind of description.Due to there is parasitic structure inductance in earthing or grounding means, so that the ground connection dress measured
The waveform of the output voltage and electric current set is not necessarily identical, thus define impulse earthed resistance be voltage waveform peak value with it is specific
The ratio of current waveform peak value.
In the prior art, it when measuring impulse earthed resistance, is carried out usually using low-frequency singalling current as access signal
Measure impulse earthed resistance.Understand however, being measured using the low-frequency singalling current because not accounting for the influence of parasitic inductance,
So that measurement result is seriously less than normal, especially when multipoint earthing, it is weak that the effect of the on line inductance between each point is measured condition
Change, so that measurement result is more inaccurate.It thus needs just to meet Practical Project as access signal using high frequency signal current
In to impulse earthed resistance measurement demand.
Thus, provide a kind of heavy impulse current device in the prior art, the device use heavy impulse current waveform as
Access signal injection earthing or grounding means measures impulse earthed resistance.Impulse earthed resistance is surveyed although this measurement method meets
The demand of amount, but the heavy impulse current device heavy impulse current device be by the energy storage of high pressure bulky capacitor, control igniting gap breakdown,
The voltage stored up on capacitor is applied on the entire discharge loop including being tested grounding body, so that it is than cumbersome, nothing
Method takes live use to, usually only uses in laboratory, and entire current loop impedance difference can cause the heavy impulse current
The current waveform of device output is different, needs experienced engineer to adjust waveform and to export same current wave under different impedances
Shape, since the device is in the whole process all in time domain scale, so that the current waveform is not easy to be adjusted at the scene, this
Sample makes the waveform of output be unsatisfactory for the requirement of rated current waveform, so as to cause calculated according to above-mentioned current waveform institute
The resistance value of impulse earthed resistance is inaccurate, not the property of can refer to (farther out compared to actual resistance value).
Summary of the invention
The embodiment of the present invention provides the measurement method and device of impulse earthed resistance, solves and occurs in the prior art
Since entire current loop impedance difference can cause the impulse earthed resistance measured caused by the current waveform difference of output
Resistance value do not have the problem of property of can refer to.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that
The embodiment of the present invention in a first aspect, providing a kind of measurement method of impulse earthed resistance, which comprises
Continuous current input signal is injected to grounding body, and the frequency of the continuous current input signal is contained by the lightning current
Highest frequency contained by fundamental frequency frequency sweep to lightning current；
The voltage responsive sequence and output current-responsive sequence of grounding body are measured at different frequencies；
The current-responsive sequence of output is modified to obtain the first current-responsive sequence of constant amplitude, and according to output
Current-responsive sequence and the first current-responsive sequence of the constant amplitude voltage responsive sequence of measurement is modified, obtain
To first voltage response sequence；
According to the first current-responsive sequence of the constant amplitude and the first voltage response sequence and lightning current wave
Shape frequency spectrum expansion sequence determines the impulse earthed resistance of the grounding body.
The second aspect of the embodiment of the present invention, provides a kind of measuring device of impulse earthed resistance, and described device includes:
Signal generator, for injecting continuous current input signal, the frequency of the continuous current input signal to grounding body
Rate is from highest frequency contained by fundamental frequency frequency sweep to lightning current contained by lightning current；
Processor, for supporting the voltage responsive sequence and output current-responsive sequence of measurement grounding body at different frequencies
Column；
The processor, the first electric current for being also used to be modified to obtain to the current-responsive sequence of output constant amplitude are rung
Sequence is answered, and is rung according to voltage of the first current-responsive sequence of the current-responsive sequence of output and the constant amplitude to measurement
It answers sequence to be modified, obtains first voltage response sequence；
The processor is also used to be responded according to the first current-responsive sequence of the constant amplitude and the first voltage
Sequence and lightning current waveform frequency spectrum expansion sequence determine the impulse earthed resistance of the grounding body.
The measurement method and device of the impulse earthed resistance provided in the embodiment of the present invention, by injecting constant amplitude to grounding body
Current input signal, the frequency of the continuous current input signal is from contained by fundamental frequency frequency sweep to lightning current contained by lightning current
Highest frequency；The voltage responsive sequence and output current-responsive sequence of grounding body are measured at different frequencies；To the electric current of output
Response sequence is modified to obtain the first current-responsive sequence of constant amplitude, and according to the current-responsive sequence of output and described
First current-responsive sequence of constant amplitude is modified to obtain first voltage response sequence to the voltage responsive sequence of measurement；Root
It is determined according to the first current-responsive sequence and first voltage response sequence and lightning current waveform frequency spectrum the expansion sequence of constant amplitude
The impulse earthed resistance of grounding body.
Compared with the prior art, this programme is by injecting continuous current input signal, continuous current input to grounding body
The frequency of signal is from highest frequency contained by fundamental frequency frequency sweep to lightning current contained by lightning current, so that the process of measurement is in
Under frequency domain coordinates, then the current-responsive sequence of the voltage responsive sequence of measurement and output is modified in frequency domain coordinates,
The the first current-responsive sequence and first voltage response sequence of constant amplitude are obtained, is then rung with the first electric current of the constant amplitude
Answer sequence and first voltage response sequence to determine the impulse earthed resistance of grounding body, due in this programme to the voltage responsive of measurement
Sequence and current-responsive sequence are corrected according to the principle of constant current scheme, so that the first electric current of revised constant amplitude
Response sequence can satisfy the requirement of rated current waveform so that the resistance value for the impulse earthed resistance finally determined compared with
For accurately and with the property of can refer to.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is a kind of flow chart of the measurement method of impulse earthed resistance provided in an embodiment of the present invention；
Fig. 2 is the time domain waveform and frequency domain amplitude-frequency characteristic figure of lightning current provided in an embodiment of the present invention；
Fig. 3 is a kind of frequency spectrum graphics of continuous current output signal provided in an embodiment of the present invention and the voltage responsive of measurement
The spectrogram of sequence；
Fig. 4 is a kind of schematic diagram of measuring circuit provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of the measuring device of impulse earthed resistance provided in an embodiment of the present invention；
Fig. 6 is the peripheral hardware circuit diagram that the embodiment of the present invention is provided based on Fig. 5.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The core concept of this programme is to be carried out by measuring in frequency domain in conjunction with the time domain that is defined on of impulse earthed resistance
Calculation processing carries out impact by means of the two spaces and connects since time-domain and frequency-domain is 2 mathematical spaces that can mutually convert
The measurement of ground resistance, so that measured result has validity and realizability.
The embodiment of the present invention provides a kind of measurement method of impulse earthed resistance, as shown in Figure 1, this method comprises:
101, continuous current input signal is injected to grounding body.
Wherein, the frequency of above-mentioned continuous current input signal is from fundamental frequency frequency sweep contained by lightning current to lightning current institute
The highest frequency contained.
Preferably, the executing subject of above-mentioned step 101 is signal generator.
Illustratively, mathematically, the waveform of above-mentioned lightning current is double-exponential function i (t), referring to following formula one.
I (t)=B* (e-t/τ1-e-t/τ2), (formula one)
Wherein, the B in formula one is the amplitude of electric current, and τ 1 is the time constant of waveform attenuating, and τ 2 is the wave head rise time
Constant；T is time variable.Shown in (a) in the corresponding waveform diagram of formula one such as Fig. 2.
Above-mentioned formula one is carried out to make periodic function after continuation in time domain appropriate, does frequency spectrum contained by i (t) point
Amount parsing, is transformed into frequency-domain analysis, and such as following formula two can be obtained.The corresponding waveform diagram of formula two such as (b) institute in Fig. 2
The amplitude-frequency characteristic shown.
Bn (k)=∫ ∫ [i (t) * (cos (k*w*t)+j*sin (k*w*t))] dt, (formula two)
Wherein, above-mentioned k is overtone order, and w is fundamental wave frequency, and w=2 π f, t are time variable, and ∫ [] dt is integral
Operation mark.
Illustratively, above-mentioned amplitude-frequency characteristic Bn (k) can be prestored in the memory space of device or instrument.Signal hair
Raw device carries out frequency spectrum solution to current waveform according in above-mentioned formula two under the operation control of the processor in device or instrument
Fundamental frequency and harmonic frequency when analysis change the measurement working frequency of output, frequency sweep by Frequency point since fundamental frequency f1
To highest frequency fn contained by lightning current signals.One group of continuous current signal, frequency spectrum are issued to tested grounding body in a frequency domain
For An (k) ', see shown in (a) in Fig. 3.If An (k) ' be etc. amplitudes, be equivalent in the time domain sending one unitary current
Impulse function δ (t).
102, the voltage responsive sequence and output current-responsive sequence of grounding body are measured at different frequencies.
Illustratively, since there are high-frequency resistances in practical grounding body, the grounding body measured at different frequencies
Voltage and instrument or device output current value be it is different, signal generator output current amplitude will be because of working frequency not
With and changes, be not able to satisfy the requirement of output unit current impulse function δ (t), thus must actual measurement with record exported
Current amplitude An (k).
Illustratively, the schematic diagram of measuring circuit as shown in Figure 4 can measure to obtain in different frequencies by the Fig. 4
The voltage responsive sequence of grounding body and output current-responsive sequence under rate.Voltage is measured on tested impulse earthed resistance Z (ω)
With output electric current, actual measurement obtains the current-responsive sequence that the voltage responsive spectrum sequence Cn (k) in frequency domain is exported with instrument or device
It arranges An (k), the spectrogram of the voltage responsive sequence C n (k) of corresponding measurement is as shown in (b) in Fig. 3.Wherein: constant pressure in Fig. 4
Signal source S (being made of signal generator and power amplifier) is if keep constant voltage output amplitude, quilt under different frequencies
Impedance Z (ω) difference is surveyed, the amplitude of electric current I (ω) is just different.R in Fig. 4 is the internal resistance of constant voltage signal source S, shown in machine
It is the recycling reference point of constant voltage signal source S output electric current interiorly, is greatly the relative potentials reference point of tested grounding body.
Illustratively, above-mentioned different frequency corresponds to fundamental frequency and harmonic frequency in formula two.From fundamental frequency f1
To highest frequency fn.
103, it is modified to obtain the first current-responsive sequence of constant amplitude to the current-responsive sequence of output, and according to
The current-responsive sequence of output and the first current-responsive sequence of constant amplitude are modified the voltage responsive sequence of measurement, obtain
To first voltage response sequence.
Illustratively, if the current-responsive sequence An (k) of output is same value, Cn (k) is exactly tested grounding body
Frequency domain voltage responsive sequence.But due to the presence of the high-frequency resistance in grounding body, so that the current-responsive of final above-mentioned output
Sequence An (k) is not with always, it is therefore desirable to be handled to obtain to the An (k) using hardware negative-feedback or mathematical processing methods
The current-responsive sequence of constant amplitude.The mode of hardware negative-feedback may be because of caused by load in very wide frequency range
Time-lag action generates self-excitation, can be unstable.So here using the current-responsive sequence by mathematical method amendment output.With reference to
Fig. 4, using the voltage and signal source S on Z (ω) be linear proportional relation, calculate when with fundamental frequency under current amplitude be
Basis, the voltage under other frequencies are scaled up with respect to it, and the voltage output amplitude for being equivalent to dummy source S improves, real
Border is scaled up the response amplitude of voltage, and current amplitude is made to be considered as same value, so that the first electric current for obtaining constant amplitude is rung
Answer sequence and first voltage response sequence.
Illustratively, above-mentioned step 103 specifically includes the following contents:
103a1, the voltage responsive sequence of measurement is brought into first voltage correction formula, obtains first voltage response sequence
Column.
103b1, the current-responsive sequence of output is brought into the first electric current correction formula, obtains the first electricity of constant amplitude
Flow response sequence；
Illustratively, above-mentioned first voltage correction formula are as follows:
Cn (k)=U (k) * I (1)/I (k), (formula three)
Illustratively, the first above-mentioned electric current correction formula are as follows:
An (k)=I (1), (formula four)
Wherein: k=1~n in above-mentioned formula three and four, above-mentioned U (k) are the in the voltage responsive sequence of measurement
K rd harmonic signal data, above-mentioned I (k) are the kth rd harmonic signal data in the current-responsive sequence of output, above-mentioned I
It (1) is the current first harmonics data in the current-responsive sequence of output, above-mentioned Cn (k) is first voltage response sequence, above-mentioned
An (k) is the first current-responsive sequence of constant amplitude.
Influence for the defect of lowering apparatus or device itself to experimental result needs the voltage responsive sequence to measurement
The whole degree amendment of difference between diversity channels is carried out with current-responsive sequence.Optionally, before above-mentioned step 103, this method further include with
Lower content:
103a2, it is modified according to voltage responsive sequence of the voltage channel correction factor to measurement, and according to current channel
Correction factor is modified the current-responsive sequence of measurement, obtains revised second voltage response sequence and the second electric current is rung
Answer sequence.
Illustratively, above-mentioned step 103a2 specifically includes the following contents:
A1, voltage channel correction factor is brought into second voltage correction formula, obtains second voltage response sequence, and will
Current channel correction factor is brought into the second electric current correction formula, and the second current-responsive sequence is obtained.
Illustratively, above-mentioned second voltage correction formula are as follows:
U (k) '=Kx_u (k) * U (k), (formula five)
Wherein, above-mentioned U (k) ' is second voltage response sequence, and above-mentioned Kx_u (k) is voltage channel correction factor, on
The U (k) stated is the voltage responsive sequence of measurement.
Illustratively, the second above-mentioned electric current correction formula are as follows:
I (k) '=Kx_i (k) * I (k), (formula six)
Wherein, above-mentioned I (k) ' is the second current-responsive sequence, and above-mentioned Kx_i (k) is current channel correction factor, on
The I (k) stated is the current-responsive sequence of output.
Illustratively, above-mentioned current channel correction factor: Kx_i (k)=I (1)/I (k), above-mentioned voltage channel amendment
Coefficient are as follows: Kx_u (k)=U (1)/U (k), in which: the fundamental wave data of k=1~n, U (1) and I (1) corresponding measurement and output, U
(k) and I (k) corresponds to the kth subharmonic data for measuring and exporting.Above-mentioned current channel correction factor and voltage channel amendment system
Number is under processor (such as: single-chip microcontroller) control, and control relay suits, and it is defeated that investment correction unit replaces external measured signal
End loop is inputted out, response amplitude is corrected, and the frequency in the voltage input channel and current measurement channel of correcting instrument is rung
Answer irregularity degree；Correct current channel adjusted coefficient K x_i (k), the voltage channel adjusted coefficient K x_u (k) of respective frequencies.It should
Kx_i (k), Kx_u (k) are saved in the nonvolatile storage of processor, are called during test processes.
Illustratively, based on above-mentioned step 103a2, above-mentioned step 103 specifically includes the following contents:
103a3, second voltage response sequence is brought into first voltage correction formula, obtains first voltage response sequence.
103b3, the second current-responsive sequence is brought into the first electric current correction formula, obtains the first electric current of constant amplitude
Response sequence.
Wherein, above-mentioned first voltage correction formula remains as above-mentioned formula three, the first above-mentioned electric current correction formula
It remains on as above-mentioned formula four, only the U (k) in above-mentioned formula three is the kth subharmonic in second voltage response sequence
Signal data, the I (k) in above-mentioned formula three are the kth rd harmonic signal data in the second current-responsive sequence, above-mentioned I
(1) it is the current first harmonics data in the second current-responsive sequence, and first voltage response sequence is remained as Cn (k), it is above-mentioned
An (k) remain as the first current-responsive sequence of constant amplitude.
104, according to the first current-responsive sequence and first voltage response sequence and lightning current waveform of constant amplitude frequency
Spectral expansion sequence determines the impulse earthed resistance of grounding body.
Illustratively, based on the perseverance in above-mentioned step 103a1 and 103a2 or above-mentioned step 103a3 and 103b3
The first current-responsive sequence and first voltage response sequence and lightning current waveform frequency spectrum the expansion sequence of tentering value determine ground connection
The impulse earthed resistance of body.
In order to enable the resistance value of the impulse earthed resistance of the grounding body finally determined is more accurate, preferably using above-mentioned
Step 103a3 and 103b3 in constant amplitude the first current-responsive sequence and first voltage response sequence and lightning current
Waveform frequency spectrum expansion sequence determines the impulse earthed resistance of grounding body.
Illustratively, above-mentioned step 104 specifically includes the following contents:
104a, to be Fourier to the first current-responsive sequence and lightning current waveform frequency spectrum of constant amplitude expansion sequence anti-
Transformation calculations obtain temporal current waveform, and are in Fu to first voltage response sequence and lightning current waveform frequency spectrum expansion sequence
Time domain voltage waveforms are calculated in leaf inverse transformation.
Illustratively, step 104a can be realized by formula seven below and formula eight.Specific formula seven and public affairs
Formula eight is as follows respectively:
Wherein, the An [k] in above-mentioned formula seven is the first current-responsive sequence of constant amplitude, and i (t) is temporal current wave
Shape；Cn [k] in above-mentioned formula eight is first voltage response sequence, and u (t) is time domain voltage waveforms；In formula seven and formula eight
Bn [k] is that sequence, e is unfolded in lightning current waveform frequency spectrumjkφFor the Fourier transformation factor, in which: ω is fundamental wave frequency when lightning current waveform does frequency domain parsing.
104b, maximum voltage value in maximum current value and time domain voltage waveforms in temporal current waveform is determined.
Illustratively, the data that time domain voltage waveforms u (t) and current waveform i (t) is mathematically only arranged in order
Point can find the maximum value u in u (t) and i (t) waveform by the method for point-by-point comparisonmaxAnd imax。
104c, the impulse earthed resistance that grounding body is determined according to maximum voltage value and maximum current value.
Illustratively, according to the definition of impulse earthed resistance, pass through r=umax/imaxObtain impulse earthed resistance value.The knot
Fruit with dash current measurement method equivalent, and is not analyzed current waveform because of frequency shift by impedance loop mathematically
It influences.
Compared with the prior art, this programme is by injecting continuous current input signal, continuous current input to grounding body
The frequency of signal is from highest frequency contained by fundamental frequency frequency sweep to lightning current contained by lightning current, so that the process of measurement is in
Under frequency domain coordinates, then the current-responsive sequence of the voltage responsive sequence of measurement and output is modified in frequency domain coordinates,
The the first current-responsive sequence and first voltage response sequence of constant amplitude are obtained, is then rung with the first electric current of the constant amplitude
Answer sequence and first voltage response sequence to determine the impulse earthed resistance of grounding body, due in this programme to the voltage responsive of measurement
Sequence and current-responsive sequence are corrected according to the principle of constant current scheme, so that the first electric current of revised constant amplitude
Response sequence can satisfy the requirement of rated current waveform so that the resistance value for the impulse earthed resistance finally determined compared with
For accurately and with the property of can refer to.
Below by the associated description in the embodiment of the measurement method based on the corresponding impulse earthed resistance of Fig. 1 to the present invention
A kind of measuring device for impulse earthed resistance that embodiment provides is introduced.It is relevant to above-described embodiment in following embodiment
The explanation of technical term, concept etc. is referred to the above embodiments, and which is not described herein again.
The embodiment of the present invention provides a kind of measuring device of impulse earthed resistance, as shown in figure 5, the device includes: signal
Generator 21 and processor 22, in which:
Signal generator 21, for injecting continuous current input signal, the frequency of the continuous current input signal to grounding body
Rate is from highest frequency contained by fundamental frequency frequency sweep to lightning current contained by lightning current.
Processor 22, for supporting the voltage responsive sequence and output current-responsive sequence of measurement grounding body at different frequencies
Column.
Processor 22 is also used to be modified the current-responsive sequence of output to obtain the first current-responsive of constant amplitude
Sequence, and according to the first current-responsive sequence of the current-responsive sequence of output and constant amplitude to the voltage responsive sequence of measurement
It carries out, amendment obtains first voltage response sequence.
Processor is also used to the first current-responsive sequence and first voltage response sequence and thunder and lightning according to constant amplitude
Stream waveform frequency spectrum expansion sequence determines the impulse earthed resistance of grounding body.
Illustratively, above-mentioned processor includes but is not limited to single-chip microcontroller.
Illustratively, above-mentioned processor 22 is being modified the current-responsive sequence of output to obtain the of constant amplitude
One current-responsive sequence, and according to the first current-responsive sequence of the current-responsive sequence of output and constant amplitude to the electricity of measurement
Pressure response sequence is modified, and when obtaining first voltage response sequence, is specifically used for:
The voltage responsive sequence of measurement is brought into first voltage correction formula, first voltage response sequence is obtained.
The current-responsive sequence of output is brought into the first electric current correction formula, the first current-responsive of constant amplitude is obtained
Sequence.
Illustratively, above-mentioned first voltage correction formula are as follows:
Cn (k)=U (k) * I (1)/I (k), (formula three)
Illustratively, the first above-mentioned electric current correction formula are as follows:
An (k)=I (1), (formula four)
Wherein: k=1~n in above-mentioned formula three and four, above-mentioned U (k) are the in the voltage responsive sequence of measurement
K rd harmonic signal data, above-mentioned I (k) are the kth rd harmonic signal data in the current-responsive sequence of output, above-mentioned I
It (1) is the current first harmonics data in the current-responsive sequence of output, above-mentioned Cn (k) is first voltage response sequence, above-mentioned
An (k) is the first current-responsive sequence of constant amplitude.
Optionally, above-mentioned processor 22 is also used to:
It is modified according to voltage responsive sequence of the voltage channel correction factor to measurement, and is corrected according to current channel and be
The current-responsive sequence of several pairs of outputs is modified, and obtains revised second voltage response sequence and the second current-responsive sequence
Column.
Illustratively, above-mentioned processor 22 is carried out according to voltage responsive sequence of the voltage channel correction factor to measurement
Second-order correction, and be modified according to current-responsive sequence of the current channel correction factor to output, obtain revised second
When voltage responsive sequence and the second current-responsive sequence, it is specifically used for:
Voltage channel correction factor is brought into second voltage correction formula, obtains second voltage response sequence, and will be electric
Circulation road correction factor is brought into the second electric current correction formula, and the second current-responsive sequence is obtained.
Illustratively, above-mentioned second voltage correction formula are as follows:
U (k) '=Kx_u (k) * U (k), (formula five),
Wherein, above-mentioned U (k) ' is second voltage response sequence, and above-mentioned Kx_u (k) is voltage channel correction factor, on
The U (k) stated is the voltage responsive sequence of measurement.
Illustratively, the second above-mentioned electric current correction formula are as follows:
I (k) '=Kx_i (k) * I (k), (formula six)
Wherein, above-mentioned I (k) ' is the second current-responsive sequence, and above-mentioned Kx_i (k) is current channel correction factor, on
The I (k) stated is the current-responsive sequence of output.
Illustratively, above-mentioned current channel correction factor: Kx_i (k)=I (1)/I (k), above-mentioned voltage channel amendment
Coefficient are as follows: Kx_u (k)=U (1)/U (k), in which: the fundamental wave data of k=1~n, U (1) and I (1) corresponding measurement and output, U
(k) and I (k) corresponds to the kth subharmonic data for measuring and exporting.Above-mentioned current channel correction factor and voltage channel amendment system
Number is under processor (such as: single-chip microcontroller) control, and control relay suits, and it is defeated that investment correction unit replaces external measured signal
End loop is inputted out, response amplitude is corrected, and the frequency in the voltage input channel and current measurement channel of correcting instrument is rung
Answer irregularity degree；Correct current channel adjusted coefficient K x_i (k), voltage channel amendment Kx_u (k) of respective frequencies.The Kx_i
(k), Kx_u (k) is saved in the nonvolatile storage of processor, is called during test processes.
Illustratively, above-mentioned processor 22 is responded according to the first current-responsive sequence and first voltage of constant amplitude
When sequence and lightning current waveform frequency spectrum expansion sequence determine the impulse earthed resistance of grounding body, it is specifically used for:
Fourier inversion is done to the first current-responsive sequence and lightning current waveform frequency spectrum the expansion sequence of constant amplitude
Temporal current waveform is calculated, and it is anti-to be Fourier to first voltage response sequence and lightning current waveform frequency spectrum expansion sequence
Transformation calculations obtain time domain voltage waveforms.
Illustratively, time domain voltage can be calculated by formula seven below and formula eight in above-mentioned processor 22
Waveform and temporal current waveform.Specific formula seven and formula eight are as follows respectively:
Wherein, the An [k] in above-mentioned formula seven is the first current-responsive sequence of constant amplitude, and i (t) is time domain
Current waveform；Cn [k] in above-mentioned formula eight is first voltage response sequence, and u (t) is time domain voltage waveforms；It is public
Bn [k] in formula seven and formula eight is that sequence, e is unfolded in lightning current waveform frequency spectrumjkφFor the Fourier transformation factor, in which: ω is fundamental wave frequency when lightning current waveform does frequency domain parsing.
Determine the maximum voltage value in the maximum current value and the time domain voltage waveforms in temporal current waveform.
Illustratively, the data that time domain voltage waveforms u (t) and current waveform i (t) is mathematically only arranged in order
Point can find the maximum value u in u (t) and i (t) waveform by the method for point-by-point comparisonmaxAnd imax。
The impulse earthed resistance of grounding body is determined according to maximum voltage value and the maximum current value.
Illustratively, according to the definition of impulse earthed resistance, pass through r=umax/imaxObtain impulse earthed resistance value.The knot
Fruit with dash current measurement method equivalent, and is not analyzed current waveform because of frequency shift by impedance loop mathematically
It influences.
Compared with the prior art, this programme is by injecting continuous current input signal, continuous current input to grounding body
The frequency of signal is from highest frequency contained by fundamental frequency frequency sweep to lightning current contained by lightning current, so that the process of measurement is in
Under frequency domain coordinates, then the current-responsive sequence of the voltage responsive sequence of measurement and output is modified in frequency domain coordinates,
The the first current-responsive sequence and first voltage response sequence of constant amplitude are obtained, is then rung with the first electric current of the constant amplitude
Answer sequence and first voltage response sequence to determine the impulse earthed resistance of grounding body, due in this programme to the voltage responsive of measurement
Sequence and current-responsive sequence are corrected according to the principle of constant current scheme, so that the first electric current of revised constant amplitude
Response sequence can satisfy the requirement of rated current waveform so that the resistance value for the impulse earthed resistance finally determined compared with
For accurately and with the property of can refer to.
The embodiment of the hardware circuit of the embodiment of the present invention is presented below, processor here is carried out by taking single-chip microcontroller as an example
Explanation.
As shown in fig. 6, can learn: it is signified to issue measurement procedure under the control of single-chip microcontroller 302 for signal generator 301
The sinusoidal signal for determining frequency sequence is in the entire measurement process of instrument or device in frequency domain coordinates, by 302 basis of single-chip microcontroller
The measured value size of electric current and voltage channel adjusts the amplification factor of high-frequency signal output power amplifier 303, control high frequency letter
The output voltage amplitude of number power amplifier 303.
Illustratively, above-mentioned single-chip microcontroller can select ATM32 chip, in addition to enough programs are empty in the ATM32 chip
Between it is outer, additionally provide interim storage that certain random access memory space is calculated for sampled data and the storage of correction factor be empty
Between.Above-mentioned signal generator can be using digital frequency synthesis technology (referred to as: DDS) device；Model X9313 can be used
Digital regulation resistance control power amplifier output voltage amplitude.
Relay 304 is controlled according to the input order single-chip microcontroller 302 of operator, by self-correcting standard block 305 or outside
Measured signal output input 306 connect the measurement circuit into instrument or device, so that instrument or device is in self-correcting or normal
Measuring state.
Illustratively, above-mentioned relay can be connected to using the relay for the 5V voltage power supply that 4 knives 2 are thrown, normally-closed contact
External measured signal output input, normally opened contact are connected to self-correcting standard block.According to the range of measurand, it is above-mentioned from
School standard block selects 100 Europe measuring resistances of 0.2% precision.
Output voltage signal in the measuring device of impulse earthed resistance in the embodiment of the present invention is in opposite sets machine
Ground, it is unrelated where the actual potential of external world's the earth opposite with the device, it specifically can be with reference to content shown in Fig. 3.
Current measurement circuit 307 will connect from all electric current collections for flowing through measured signal output input 306 to one
In machine on the sample resistance on ground, the voltage on the sample resistance is proportional to the electric current of output, and modulus is sent into after suitably amplifying and is turned
Parallel operation 308.Voltage measurement circuit uses the voltage input circuit 309 of anti-common-mode signal, and input port connects from the tested external world
It is sampled in ground resistance.Voltage signal passes through 50HZ filter circuit 310, does 10 times to live power frequency interference signals that may be present
Inhibition, finally be sent into analog-digital converter 308, measured simultaneously with current signal.
Illustratively, the high speed with sampling holder that above-mentioned analog-digital converter 308 selects binary channels that can measure simultaneously
Spend high-precision adc, it is desirable that for its signal by frequency up to 2MHz, sample rate is greater than the chip of 100kHz.Using mixed
Folded effect principle, is acquired frequency 300khz repetitive waveform below.
Preferably, the model AD7656 that above-mentioned analog-digital converter can use, precision 16bits, sample frequency is most
A height of 250KHz, has sampling holder, and signal is 2MHz by frequency；Input channel is connected to electric current, voltage and battery respectively
Measurement channel.Under the support of single-chip microcontroller, the aliasing sampled measurements of 2MHz within signal can be done.
Above-mentioned device is also circumscribed with liquid crystal display 311, the liquid crystal display 311 other than display waveform and data,
The touch function of institute's band will support simple human-computer dialogue operation selection.
Above-mentioned device is after measurement process, will be related with measurement by power supply management circuit 312 when being calculated
The excision of working power required for partial circuit, reduces battery consumption.Display power supply is kept within the set time, at one section
Between when not operating, the power supply of whole device will be closed by automatic shutdown circuitry 313, and protect battery.
Optionally, above-mentioned device further includes working power and special charging circuit 314, which is using 2 sections
The lithium battery of 3.7V, operating mode are respective charge independence, discharged in series.Each battery is equipped with exclusive Charge Management electricity
Road guarantees that charging is reliable.
Optionally, above-mentioned device is additionally provided with battery voltage measurement circuit 315, and electricity is checked in booting and measurement process
Cell voltage shuts down after providing prompt when voltage is lower than lower limit value as defined in battery.
Through the above description of the embodiments, it is apparent to those skilled in the art that, for description
It is convenienct and succinct, only the example of the division of the above functional modules, in practical application, can according to need and will be upper
It states function distribution to be completed by different functional modules, i.e., the internal structure of device is divided into different functional modules, to complete
All or part of function described above.The specific work process of the system, apparatus, and unit of foregoing description, before can referring to
The corresponding process in embodiment of the method is stated, details are not described herein.
In several embodiments provided herein, it should be understood that disclosed device can be by others side
Formula is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the module or unit, only
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be tied
Another system is closed or is desirably integrated into, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or logical of device or unit
Letter connection can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
It is each that equipment (can be personal computer, server or the network equipment etc.) or processor (processor) execute the present invention
The all or part of the steps of embodiment the method.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory
(ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic or disk
Etc. the various media that can store program code.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of measurement method of impulse earthed resistance, which is characterized in that the described method includes:
Continuous current input signal is injected to grounding body, the frequency of the continuous current input signal fundamental wave contained by the lightning current
Highest frequency contained by frequency-swept to lightning current；
The voltage responsive sequence and output current-responsive sequence of grounding body are measured at different frequencies；
The current-responsive sequence of output is modified to obtain the first current-responsive sequence of constant amplitude, and according to the electricity of output
Stream response sequence and the first current-responsive sequence of the constant amplitude are modified the voltage responsive sequence of measurement, obtain the
One voltage responsive sequence；
According to the first current-responsive sequence of the constant amplitude and the first voltage response sequence and lightning current waveform frequency
Spectral expansion sequence determines the impulse earthed resistance of the grounding body.
2. the method according to claim 1, wherein the current-responsive sequence of described pair of output is modified to obtain
First current-responsive sequence of constant amplitude, and rung according to the first electric current of the current-responsive sequence of output and the constant amplitude
It answers sequence to be modified the voltage responsive sequence of measurement, obtains first voltage response sequence, specifically include:
The voltage responsive sequence of measurement is brought into first voltage correction formula, first voltage response sequence is obtained；
The current-responsive sequence of output is brought into the first electric current correction formula, the first current-responsive sequence of constant amplitude is obtained
Column；
Wherein, first voltage correction formula are as follows: Cn (k)=U (k) * I (1)/I (k), the first electric current correction formula are as follows: An
(k)=I (1), in which: k=1~n, the U (k) is the kth rd harmonic signal data in the voltage responsive sequence of measurement, described
I (k) is the kth rd harmonic signal data in the current-responsive sequence of output, and the I (1) is in the current-responsive sequence of output
Current first harmonics data, the Cn (k) be first voltage response sequence, the An (k) be constant amplitude the first current-responsive
Sequence.
3. the method according to claim 1, wherein the current-responsive sequence of described pair of output is modified to obtain
Before first current-responsive sequence of constant amplitude, further includes:
It is modified according to voltage responsive sequence of the voltage channel correction factor to measurement, and according to current channel correction factor pair
The current-responsive sequence of output is modified, and obtains revised second voltage response sequence and the second current-responsive sequence.
4. according to the method described in claim 3, it is characterized in that, it is described according to voltage channel correction factor to the voltage of measurement
Response sequence is modified, and is modified according to current-responsive sequence of the current channel correction factor to output, is corrected
Second voltage response sequence and the second current-responsive sequence afterwards, specifically include:
Voltage channel correction factor is brought into second voltage correction formula, obtains second voltage response sequence, and electric current is led to
Road correction factor is brought into the second electric current correction formula, and the second current-responsive sequence is obtained；
Wherein, second voltage correction formula are as follows: U (k) '=Kx_u (k) * U (k), the U (k) ' it is second voltage response sequence,
The Kx_u (k) is voltage channel correction factor, and the U (k) is the voltage responsive sequence of measurement；Second electric current correction formula
Are as follows: I (k) '=Kx_i (k) * I (k), the I (k) ' it is the second current-responsive sequence, the Kx_i (k) is current channel amendment
Coefficient, the I (k) are the current-responsive sequence of output.
5. the method according to claim 1, wherein the first current-responsive sequence according to the constant amplitude
Column and the first voltage response sequence and lightning current waveform frequency spectrum expansion sequence determine the impulse grounding electricity of the grounding body
Resistance, specifically includes:
Fourier inversion is done to the first current-responsive sequence and lightning current waveform frequency spectrum the expansion sequence of the constant amplitude
Temporal current waveform is calculated, and the first voltage response sequence and lightning current waveform frequency spectrum expansion sequence are in Fu
Time domain voltage waveforms are calculated in leaf inverse transformation；
Determine the maximum voltage value in the maximum current value and the time domain voltage waveforms in the temporal current waveform；
The impulse earthed resistance of the grounding body is determined according to the maximum voltage value and the maximum current value.
6. a kind of measuring device of impulse earthed resistance, which is characterized in that described device includes:
Signal generator, for injecting continuous current input signal to grounding body, the frequency of the continuous current input signal from
Highest frequency contained by fundamental frequency frequency sweep to lightning current contained by lightning current；
Processor, for supporting the voltage responsive sequence and output current-responsive sequence of measurement grounding body at different frequencies；
The processor is also used to be modified the current-responsive sequence of output to obtain the first current-responsive sequence of constant amplitude
Column, and according to the first current-responsive sequence of the current-responsive sequence of output and the constant amplitude to the voltage responsive sequence of measurement
Column are modified, and obtain first voltage response sequence；
The processor is also used to the first current-responsive sequence and the first voltage response sequence according to the constant amplitude
And lightning current waveform frequency spectrum expansion sequence determines the impulse earthed resistance of the grounding body.
7. device according to claim 6, which is characterized in that the processor repairs the current-responsive sequence of output
Just obtaining the first current-responsive sequence of constant amplitude, and according to the first of the current-responsive sequence of output and the constant amplitude
Current-responsive sequence is modified the voltage responsive sequence of measurement, when obtaining first voltage response sequence, is specifically used for:
The voltage responsive sequence of measurement is brought into first voltage correction formula, first voltage response sequence is obtained；
The current-responsive sequence of output is brought into the first electric current correction formula, the first current-responsive sequence of constant amplitude is obtained
Column；
Wherein, first voltage correction formula are as follows: Cn (k)=U (k) * I (1)/I (k), the first electric current correction formula are as follows: An
(k)=I (1), in which: k=1~n, the U (k) is the kth rd harmonic signal data in the voltage responsive sequence of measurement, described
I (k) is the kth rd harmonic signal data in the current-responsive sequence of output, and the I (1) is in the current-responsive sequence of output
Current first harmonics data, the Cn (k) be first voltage response sequence, the An (k) be constant amplitude the first current-responsive
Sequence.
8. device according to claim 6, which is characterized in that the processor is also used to:
It is modified according to voltage responsive sequence of the voltage channel correction factor to measurement, and according to current channel correction factor pair
The current-responsive sequence of output is modified, and obtains revised second voltage response sequence and the second current-responsive sequence.
9. device according to claim 8, which is characterized in that the processor according to voltage channel correction factor to survey
The voltage responsive sequence of amount is modified, and is modified according to current-responsive sequence of the current channel correction factor to output,
When obtaining revised second voltage response sequence and the second current-responsive sequence, it is specifically used for:
Voltage channel correction factor is brought into second voltage correction formula, obtains second voltage response sequence, and electric current is led to
Road correction factor is brought into the second electric current correction formula, and the second current-responsive sequence is obtained；
Wherein, second voltage correction formula are as follows: U (k) '=Kx_u (k) * U (k), the U (k) ' it is second voltage response sequence,
The Kx_u (k) is voltage channel correction factor, and the U (k) is the voltage responsive sequence of measurement；Second electric current correction formula
Are as follows: I (k) '=Kx_i (k) * I (k), the I (k) ' it is the second current-responsive sequence, the Kx_i (k) is current channel amendment
Coefficient, the I (k) are the current-responsive sequence of measurement.
10. device according to claim 6, which is characterized in that the processor is according to the first of the constant amplitude
Current-responsive sequence and the first voltage response sequence and lightning current waveform frequency spectrum expansion sequence determine the grounding body
When impulse earthed resistance, it is specifically used for:
Fourier inversion is done to the first current-responsive sequence and lightning current waveform frequency spectrum the expansion sequence of the constant amplitude
Temporal current waveform is calculated, and the first voltage response sequence and lightning current waveform frequency spectrum expansion sequence are in Fu
Time domain voltage waveforms are calculated in leaf inverse transformation；
Determine the maximum voltage value in the maximum current value and the time domain voltage waveforms in the temporal current waveform；
The impulse earthed resistance of the grounding body is determined according to the maximum voltage value and the maximum current value.
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| CN109188096B (en) * | 2018-11-12 | 2020-07-28 | 广东电网有限责任公司 | Contact resistance measuring method and device |
| CN112083214B (en) * | 2020-08-28 | 2023-05-16 | 广东电网有限责任公司广州供电局 | Current measuring device for pilot discharge process |
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Effective date of registration: 20210806 Address after: 510700 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China Southern Power Grid Research Institute Co.,Ltd. Patentee after: WUHAN WUGAO ELECTRICAL TECHNOLOGY Co.,Ltd. Address before: 510080 West Tower 13-20 Floor, Shui Jungang 6 and 8 Dongfeng East Road, Yuexiu District, Guangzhou City, Guangdong Province Patentee before: China Southern Power Grid Research Institute Co.,Ltd. Patentee before: CSG POWER GRID TECHNOLOGY RESEARCH CENTER Patentee before: WUHAN WUGAO ELECTRICAL TECHNOLOGY Co.,Ltd. |