CN105116230B  A kind of method of use multifrequency measurement in a closed series earthing or grounding means impulse earthed resistance  Google Patents
A kind of method of use multifrequency measurement in a closed series earthing or grounding means impulse earthed resistance Download PDFInfo
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 CN105116230B CN105116230B CN201510512995.4A CN201510512995A CN105116230B CN 105116230 B CN105116230 B CN 105116230B CN 201510512995 A CN201510512995 A CN 201510512995A CN 105116230 B CN105116230 B CN 105116230B
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 238000005259 measurement Methods 0.000 claims abstract description 16
 230000005540 biological transmission Effects 0.000 claims description 5
 230000000875 corresponding Effects 0.000 claims description 5
 230000005611 electricity Effects 0.000 claims description 5
 230000035939 shock Effects 0.000 claims description 5
 238000001228 spectrum Methods 0.000 claims description 5
 230000001131 transforming Effects 0.000 claims description 4
 230000001186 cumulative Effects 0.000 claims description 3
 230000005284 excitation Effects 0.000 abstract description 3
 230000001052 transient Effects 0.000 abstract description 3
 210000001503 Joints Anatomy 0.000 abstract description 2
 238000000354 decomposition reaction Methods 0.000 abstract description 2
 238000004364 calculation method Methods 0.000 description 3
 238000011156 evaluation Methods 0.000 description 3
 238000004088 simulation Methods 0.000 description 2
 239000002689 soil Substances 0.000 description 2
 206010042255 Struck by lightning Diseases 0.000 description 1
 238000006243 chemical reaction Methods 0.000 description 1
 238000010183 spectrum analysis Methods 0.000 description 1
 238000010998 test method Methods 0.000 description 1
Abstract
The invention discloses a kind of method of use multifrequency measurement in a closed series earthing or grounding means impulse earthed resistance, the present invention is by testing measurement and numerical computations, it was found that being used as excitation by carrying out the sinusoidal waveform after Fourier decomposition to lightning current waveform, the lightning impulse response of transient state can be converted into the response of stable state by being carried on earthing or grounding means, the result easily studied under voltage, the currentresponsive rule of earthing or grounding means, the result and lightning impulse that will be obtained after obtained response inversefouriertransform is basically identical.Measuring method proposed by the present invention can achieve a butt joint ground device impulse earthed resistance accurate assessment, and guide carry out grounding reconstruction, it is ensured that the safety of personnel and equipment.
Description
Technical field
The present invention relates to a kind of method of use multifrequency measurement in a closed series earthing or grounding means impulse earthed resistance, this method is applicable
In the measurement of the earthing or grounding means such as transformer station, electric power line pole tower, belong to HyperVoltage of Power Systems field.
Background technology
Lightning surge is to cause the one of the main reasons of transmission line of electricity tripping fault, transformer station and transmission line of electricity bar at present
Tower earthing or grounding means is to protect power system security reliability service, protect the important measures of personal security nearby.Accurate evaluation is grounded
The impulse earthed resistance of device is for rationally design transformer station and overhead line structures grounding body pattern and reduction impulse earthed resistance
With important directive significance.Existing research is concentrated mainly on simulated experiment and the impact by simulation study earthing or grounding means
The size of grounding resistance.Due to the finite capacity of current surgepower generator, it is impossible to accomplish the experimental condition of true type experiment, and
What soil resistivity took substantially when being calculated with simulation software is uniform soil, and result of calculation there will certainly be with actual conditions
Error.Existing experiment and simulation calculation are difficult the accurate impulse earthed resistance for calculating earthing or grounding means.
The present invention is had found by being carried out to lightning current waveform after Fourier decomposition just by testing measurement and numerical computations
String waveform is as excitation, and the lightning impulse response of transient state can be converted into the response of stable state by being carried on earthing or grounding means, more be held
Voltage, the currentresponsive rule of earthing or grounding means are easily studied, by the result and thunder and lightning that are obtained after obtained response inversefouriertransform
Result under impact is basically identical.
Measuring method proposed by the present invention can achieve a butt joint the accurate assessment of ground device impulse earthed resistance, and refer to
Lead carry out grounding reconstruction, it is ensured that the safety of personnel and equipment.
The content of the invention
It is an object of the invention to provide the test method of the impulse earthed resistance of accurate evaluation thunderbolt earthing or grounding means, use
This method can be used for the impulse earthed resistance of accurate evaluation earthing or grounding means, and guide carry out grounding reconstruction, it is ensured that personnel are with setting
Standby safety.
The technical solution adopted for the present invention to solve the technical problems comprises the following steps：
The first step, carries out Fourier transformation to lightning current waveform expression formula, obtains the spectrum expression formula of lightning current waveform；This
The lightning current waveform expression formula used is invented for doubleexponential function：
I (t)=I_{m}(e^{αt}e^{βt})
Wherein I_{m}For the amplitude of lightning current, its value is to take 10kA in any positive integer, the present invention.Due to domestic many documents
(with reference to article《By the transient state Potential distribution of transmission tower when being struck by lightning and its earthing or grounding means》With《Consider the shaft tower of spark discharge
Impulse grounding characteristic computing method》) standard lightning current waveform is calculated using 2.6/50 μ s, therefore the present invention also uses standard
The μ s of lightning current waveform 2.6/50 are calculated.When using 2.6/50 μ s of lightning current reference waveform, α=14790.2, β in formula=
1877833 (computational methods reference articles《The spectrum analysis and its application of standard thunder and lightning waveform》).The function is subjected to Fourier
After conversion, its spectrum expression formula is:
Second step, determines measuring fundamental frequency f：
And its integer multiple frequency harmonic wave f_{i}=i*f；Wherein T is the wavelength of lightning current, i=0,1 ..., n；Work as lightning current wave
When shape uses 2.6/50 μ s, T=50 μ s, n=120.
3rd step, the frequency that lightning current is provided by second step is decomposed, and obtains the corresponding time domain of each frequency current
Function expression is：
Wherein
ω_{i}=2 π f_{i}
4th step, to earthing or grounding means to be measured, measurement is surveyed using the three electrode method wire laying mode advised in DL4751992 codes
Power supply variable frequency alternating current power source is measured, its frequency is adjusted to the frequency that second step is provided one by one, measurement is obtained in f_{0}To f_{120}Each
The current amplitude A ' of power supply output under frequency_{i}, and corresponding Stable State of Sine response voltage magnitude B_{i}, voltage and input current phase
Potential difference ψ_{i}, obtaining time domain response voltage expression under the frequency is：
5th step, the response voltage expression that the 4th step is obtained into each frequency carries out cumulative summation, obtains earthing or grounding means
Lightning impulse response voltage approximate expression be：
6th step, draws the oscillogram that the 5th step lightning impulse responds voltage expression, and shock response electricity is read from figure
Pressure amplitude value u_{max}, and earthing or grounding means impulse earthed resistance R is obtained by following formula calculating_{ch}：
In abovementioned steps, measured wiring method uses the angleoff set advised in DL4751992 codes in the 4th step.
In abovementioned steps, realized when the 6th step is drawn using EXCEL or the MATHEMATICK software for possessing drawing function.
Brief description of the drawings
The present invention is further illustrated with reference to the accompanying drawings and examples.
Accompanying drawing 1 is 2.6/50 μ s standard lightning current waveforms.
It is sinusoidal excitation, d at u that accompanying drawing 2, which is measured for three electrode method in the test philosophy figure of grounding body voltage responsive, figure,_{12}Away from
From should be d_{13}0.618 times.
Accompanying drawing 3 is to calculate obtained shock response voltage waveform according to the 6th step formula using MATLAB.
Embodiment
Below by case study on implementation, with reference to accompanying drawing 1, accompanying drawing 2, accompanying drawing 3 introduces embodiment in scene.
The first step, to the μ s of lightning current reference waveform 2.6/50, is shown in accompanying drawing 1, carries out Fourier transformation, obtain lightning current waveform
Spectrum expression formula；
I_{m}Take α=14790.2, β=1877833 in 10kA, formula.
Second step, determines measuring fundamental frequency f：
And its integer multiple frequency harmonic wave f_{i}=i*f；
Wherein T=50 μ s, f_{1}=20000Hz, f_{i}=i*20000Hz, i=0,1 ..., n；N=120.
3rd step, the frequency that lightning current is provided by second step is decomposed, and obtains the corresponding time domain of each frequency current
Function expression is：
Wherein
ω_{i}=2 π f_{i} f_{1}=20000Hz, f_{i}=i*20000Hz, i=0,1 ..., n；N=120.
4th step, is measured to electric power line pole tower to be measured, and measurement is using three poles advised in DL4751992 codes
Method wire laying mode, is shown in accompanying drawing 2, measures power supply variable frequency alternating current power source, its frequency is adjusted into the frequency that second step is provided one by one,
The current amplitude of power supply output is 10A, and measurement is obtained in f_{0}To f_{120}Corresponding Stable State of Sine response voltage magnitude under each frequency
B_{i}, voltage and input current phase difference ψ_{i}, obtaining time domain response voltage expression under the frequency is：
I=0 in formula, 1 ... ..., 120；
5th step, the response voltage expression that the 4th step is obtained into each frequency carries out cumulative summation, obtains transmission line of electricity
The lightning impulse of tower grounding body responds voltage approximate expression：
6th step, draws the oscillogram that the 5th step lightning impulse responds voltage expression using MATLAB softwares, sees accompanying drawing
3, shock response voltage magnitude u is read from figure_{max}, the lightning current shock response voltage amplitude in the case of this kind is obtained by calculating
It is worth for 342.44kV；
And the impulse earthed resistance R for obtaining electric power line pole tower grounding body is calculated by following formula_{ch}：
Then the impulse earthed resistance of grounding body is in the case of this kind：
Claims (4)
1. a kind of method of use multifrequency measurement in a closed series earthing or grounding means impulse earthed resistance, it is characterised in that including following step
Suddenly：
The first step carries out Fourier transformation to lightning current waveform expression formula, obtains the spectrum expression formula of lightning current waveform；Use
Lightning current waveform expression formula is doubleexponential function：
I (t)=I_{m}(e^{αt}e^{βt})
Wherein I_{m}For the amplitude of lightning current, its value is any positive integer；When lightning current waveform uses 2.6/50 μ s, α is ripple in formula
Preceding attenuation coefficient, α=14790.2, β is wave rear attenuation coefficient, β=1877833；The function is carried out after Fourier transformation, its
Spectrum expression formula is:
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And its integer multiple frequency harmonic wave f_{i}=i*f；Wherein cycle T takes the wavelength of lightning current, i=0,1 ..., n；Work as lightning current waveform
During using 2.6/50 μ s, T=50 μ s, n=120；
3rd step, the frequency that lightning current is provided by second step is decomposed, and obtains the corresponding timedomain function of each frequency current
Expression formula is：
Wherein
ω_{i}=2 π f_{i}
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4th step, to earthing or grounding means to be measured, measurement is using the three electrode method wire laying mode advised in DL4751992 codes, measurement electricity
Source variable frequency alternating current power source, the frequency that second step is provided is adjusted to by its frequency one by one, records what power supply under each frequency was exported
Current amplitude A '_{i}, and corresponding Stable State of Sine response voltage magnitude B_{i}And voltage and input current phase difference ψ_{i}, obtain the frequency
Lower time domain response voltage expression is：
5th step, the response voltage expression that the 4th step is obtained into each frequency carries out cumulative summation, obtains the thunder of earthing or grounding means
Surge responds voltage approximate expression：
6th step, draws the oscillogram that the 5th step lightning impulse responds voltage expression, shock response voltage amplitude is read from figure
Value u_{max}, and the impulse earthed resistance R for obtaining earthing or grounding means is calculated by following formula_{ch}：
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2. a kind of method of use multifrequency measurement in a closed series earthing or grounding means impulse earthed resistance according to claim 1, its
It is characterised by, measured wiring method uses the angleoff set advised in DL4751992 codes in the 4th step.
3. a kind of method of use multifrequency measurement in a closed series earthing or grounding means impulse earthed resistance according to claim 1, its
It is characterised by, the software that can be possessed drawing function using EXCEL or MATHEMATICK when the 6th step is drawn is realized.
4. a kind of method of use multifrequency measurement in a closed series earthing or grounding means impulse earthed resistance according to claim 1, its
It is characterised by, the earthing or grounding means of earthing or grounding means of the earthing or grounding means comprising electric power line pole tower and transmission transformer station.
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CN105823931A (en) *  20160314  20160803  江西华强金源电气有限公司  Novel effective method for measuring resistance value of grounding device 
CN105842542A (en) *  20160413  20160810  云南电网有限责任公司电力科学研究院  Grounding device impacted grounding resistance measuring method and system 
CN107102208B (en) *  20170425  20190802  南方电网科学研究院有限责任公司  A kind of measurement method and device of impulse earthed resistance 
CN110007180A (en) *  20180105  20190712  深圳康普盾科技股份有限公司  A kind of ground line connection reliability test method and device 
CN109613340A (en) *  20190124  20190412  贵州电网有限责任公司  A kind of impulse earthed resistance calculation method with spark thorn 
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