CN106093589A - A kind of pole tower ground resistance Accurate measurement and device - Google Patents
A kind of pole tower ground resistance Accurate measurement and device Download PDFInfo
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- CN106093589A CN106093589A CN201610647763.4A CN201610647763A CN106093589A CN 106093589 A CN106093589 A CN 106093589A CN 201610647763 A CN201610647763 A CN 201610647763A CN 106093589 A CN106093589 A CN 106093589A
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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
Abstract
The invention discloses a kind of pole tower ground resistance Accurate measurement and device, including using what magnetic field method judged grounding body to bury orientation underground；Four-electrode method is utilized to measure the soil resistivity of soil near grounding body；Select injection current frequency range according to soil resistivity, record one group of pole tower ground resistance measured value, revise measurement result, draw the measurement exact value of pole tower ground resistance.The present invention provides apparatus and method can not turn off ground lead and realizes the accurate measurement to pole tower ground resistance value, first passes through and grounding body is buried underground the judgement in orientation realizes vertical cloth pole, improves the accuracy measured；Secondly by soil resistivity near shaft tower being measured the power frequency selecting to inject, improve the measuring method adaptability to different shaft tower soil environments；Without disconnecting ground lead, improve the work efficiency of measurement of Grounding Resistance.For the calculating of pole tower ground resistance, use mean value method, make measurement error minimize, promote the accuracy of measurement result.
Description
Technical field
The present invention relates to pole tower ground resistance field of measuring technique, particularly to a kind of pole tower ground resistance accurately side of measurement
Method and device.
Background technology
Lightning conducter is as one of most basic lightning protection measures of transmission line of electricity, and both protection circuit is attacked directly from thunder and lightning, the most also
With the current by pass that support shaft tower, grounding device collectively form lightning current.Grounding device is by the grounding body being embedded in the earth and connects
Ground lead-in wire is constituted, and is the most important part of whole current by pass, and earth resistance is the major parameter weighing grounding device.Work as thunder
Electric current is when current by pass flows into the earth, and the pressure drop on grounding device will make lightning conducter obtain an above earth potential, if ground connection
Resistance is crossed senior general and is caused lightning conducter potential rise height generation back overrating voltage to make line tripping.
Therefore pole tower ground resistance value directly affects the tripping operation number of times of transmission line of electricity, and the operation to electrical network has vital
Effect.The earth resistance meeting regulatory requirements is the guarantee transmitted electric power safely and steadly.Measure bar the most accurately and efficiently
Tower grounding resistance has important engineering significance.And at present commonly used in engineering pole tower ground resistance measurement method is accurate
Property is the most not fully up to expectations, and the pole tower ground resistance measurement method commonly used in engineering now mainly has following several:
1) three electrode method
Three electrode method is to be used widest a kind of pole tower ground resistance measurement method in current engineering project.The method base
In voltage x current principle, the mode arranging electric current pole tension pole is used to measure, during measurement, injection current letter in grounding body
Number I, and measure the voltage U on voltage pole, finally obtain pole tower ground resistance value R=U/I, but the premise of the method is at soil
Uniform and grounding body is counted as under hemispheroidal equivalent condition, can obtain the voltage pole distance away from grounding body by Theoretical Calculation
It is 0.618 than the distance of upper electric current pole span grounding body, in theory voltage pole is positioned at zero-potential point, the most also the method is referred to as
0.618 method.
Three electrode method requires that during measuring the oriented perpendicular of burying underground along grounding body lays measurement electrode, but in engineering
In reality, due to the factor such as loss of construction drawing, earthing pole to bury orientation underground the most unknown, therefore vertical cloth pole is generally difficult to
Accomplished, the accuracy therefore measured also is difficult to be ensured completely.Additionally, due to inject the electric current of grounding body usually
Power current, therefore needs to disconnect ground lead during measuring, and in practice, the current by pass of lightning current contains ground connection
Lead-in wire, the measurement result disconnecting ground lead also cannot accurately reflect the true resistive value situation of grounding body.And owing to measuring process
In need to disconnect shaft tower ground lead, therefore considerably increase the workload of measurement, inefficient.
2) high frequency multiple process
Cloth pole mode is similar to the high frequency multiple process of three electrode method and achieves and do not turn off shaft tower grounding resistance under ground lead
Measuring, its principle utilized is to inject 10kHz high frequency electric to grounding body, owing to lightning conducter inductance value is much larger than grounding body inductance
Value, when injecting high-frequency signal, therefore most current can achieve a butt joint ground in ground lead flows into grounding body
The on-line measurement of bulk resistor.
Yet with different shaft towers, the impedance of grounding body and the induction reactance of shaft tower are not quite similar, different buried underground the soil of shaft tower
Soil resistivity the most different, high-frequency method inject stable 10kHz frequency current the adaptability of shaft tower local environment is also difficult to
It is guaranteed.Therefore, the accuracy of high-frequency method also has much room for improvement.
3) split-core type meter method
The appearance of nineteen nineties pincerlike meter achieves and not exclusively disconnects earthmeter pole tower ground resistance value, its
Without arranging electrode when maximum advantage is i.e. to measure, i.e. bury orientation underground, as long as being pressed from both sides by split-core type meter without know tower grounding body
On ground lead, just can measure.Compared with traditional three electrode method needing cloth pole, the method significantly reduces manpower thing
Power, improves measuring speed.
And split-core type meter method is owing to utilizing the principle of electromagnetic induction, it is highly prone to interference when measuring pole tower ground resistance, therefore
The accuracy measured is generally difficult to be guaranteed.Generally, split-core type meter method is only from transformer station's former base shaft towers out
Higher accuracy is had in measurement.
In sum, the major defect that current pole tower ground resistance is measured has:
1. to bury orientation underground indefinite for grounding body；
2. need disconnection ground lead, injection current frequency single；
3. the impact of soil resistivity is not considered.
Accordingly, it would be desirable to study a kind of energy accurately cloth pole and realize accurately measuring shaft tower in the case of not turning off ground lead
The method of earth resistance.
Summary of the invention
It is an object of the invention to study a kind of accurate measurement apparatus of pole tower ground resistance and method, it is achieved to tower grounding electricity
The accurate measurement of resistance.This method achieves the judgement that grounding body is buried underground orientation, thus realizes and earthing pole during measuring
The vertical cloth pole mode in direction；This method achieves and does not turns off ground lead measurement, thus contains grounding lead in measurement result
The resistance of line, has more accurate measurement result；This method is by the measurement to soil resistivity, it is achieved injection current frequency
Selection, different shaft towers is had higher adaptability.This method overcomes the ground resistance measurement method institute commonly used
The deficiency having, has higher accuracy, is proved to be that one is the most feasible, measure convenient method.
Below main contents of the present invention are carried out the analysis in principle:
1, pole tower ground resistance Accurate measurement
(1) pole tower ground resistance buries the detection in orientation underground
The measuring circuit of this method uses the cloth pole mode of three electrode method, and in order to avoid interference, makes measurement result more accurate
Really, three electrode method requires that during measuring measuring electrode arranges along Grounding Grids direction.Due to construction drawing in Practical Project
The reasons such as loss, it is the most unknown that grounding body buries orientation underground.By magnetic field, this method proposition is a kind of judges that grounding body buries orientation underground
Method.
Before measurement is carried out, injection current in tower grounding body, electric current grounded body diffusing in soil, due to grounding body
Resistance is much smaller than electric resistance of soil, and therefore the grounded body of electric current major part is buried direction underground and flowed, and electric current can shape at soil surface
Becoming magnetic field, according to electromagnetic field correlation theory, the magnetic induction burying orientation along grounding body underground is maximum.Use corresponding detection
Magnetic induction instrument detection soil surface magnetic field, just can learn that grounding body buries orientation underground.This method is through simulation analysis and scene
Experiment is proved to be a kind of and feasible judges the method that grounding body buries orientation underground.
(2) do not turn off ground lead to measure
It is inefficient compared to on-line measurement mode that off-line measurement mode disconnects ground lead, and the current by pass of lightning current
Containing ground lead, therefore, the accuracy of the metering system measurement result disconnecting ground lead is also difficult to be guaranteed, it is impossible to
The reaction the most real situation of grounding body.The present invention uses the method not turning off ground lead on-line measurement to carry out earth resistance survey
Amount.Inject the electric current of sufficiently large frequency to tower grounding body, now shaft tower and lightning conducter induction reactance are more much bigger than grounding body impedance, can
Think that shaft tower part is open, it is achieved that the on-line measurement to earth resistance.
(3) frequency-selecting type measuring method
Traditional high frequency multiple process uses 10kHz electric current to inject tower grounding body, and due to different high pressure shaft tower inductance value
Difference, the soil resistivity difference of different shaft tower local environments causes grounding body impedance the most different, is therefore only injected into 10kHz frequency
Electric current is not strong for the adaptability of different shaft tower environment, and therefore the accuracy of measurement result also cannot be guaranteed.
The present invention uses the method for frequency-selecting to carry out the selection of injection current frequency.First the soil of soil near shaft tower is measured
Resistivity, selects the frequency range of injection current frequency according to soil resistivity, injects one group of frequency in this frequency range to tower grounding body
Rate, calculates measurement resistance value, and utilizes averaging method to calculate measurement result, draw the measured value of pole tower ground resistance.Logical
Cross the experimental data with three electrode method and split-core type meter method to compare, this method can be obtained feasible, and measurement result is accurate.
2, the design of frequency-selecting type ground connection shaft tower earth resistance metering device
Frequency-selecting type pole tower ground resistance measurement apparatus is made up of, wherein field measurement apparatus and central processing module two parts
Field measurement apparatus includes: driving source module, signal acquisition circuit module, central processing module, LCD MODULE, power supply electricity
Road, field measurement apparatus mainly completes data signal acquisition, the calculating carrying out soil resistivity at on-the-spot shaft tower and earth resistance
The calculating of value and display, the selection of power frequency.
Device uses the cloth pole mode of three electrode method, by soil resistivity is measured the electric current frequency selecting to inject grounding body
The voltage gathered, current signal input central authorities after amplification, filtering, conversion process are processed by rate by signal acquisition module
Module (single-chip microcomputer) calculates tested pole tower ground resistance value, uses averaging method at this during calculating, so that overall calculation is by mistake
Difference minimum, accurately reflects grounding resistance.
Analyzing in view of above, the technical solution used in the present invention is: a kind of pole tower ground resistance Accurate measurement, including
Following steps:
1) pole tower ground resistance buries the detection in orientation underground, uses what magnetic field method judged grounding body to bury orientation underground, so that it is determined that
The cloth set direction of electrode.
2) four-electrode method is utilized to measure the soil resistivity of soil near grounding body.
3) use the cloth pole mode of three electrode method to measure the laying of electrode, select injection current frequency according to soil resistivity
Rate scope, injects one group of electric current in this frequency range to tower grounding body, calculates one group of resistance value to be measured, and profit respectively
With averaging method, described one group of resistance value to be measured is calculated, draw the measured value of pole tower ground resistance.
Specifically, in step 1) in, what described magnetic field method judged grounding body buries orientation underground particularly as follows: in tower grounding body
Injection current, reclaims through electrode after the grounded body of electric current and soil diffusing and forms magnetic field at soil surface；Magnetic field is utilized to visit
Surveying the distribution situation in instrument detection soil surface magnetic field, with Current injection points as the center of circle, distance decanting point a distance is radius measurement circle
Magnetic Induction Density Distribution on week, magnetic induction strength is tower grounding body and buries orientation underground, is designated as an E, in like manner in distance
Measure the distribution of magnetic induction on the circumference of decanting point b distance, show that tower grounding body buries orientation underground, be designated as a F, some E with
What the line direction of some F was tower grounding body buries orientation underground.
In technique scheme, step 3) described according to soil resistivity selection injection current frequency range, it is basis
Following relation carries out injection current frequency range selection:
Being defined below of the higher limit of above-mentioned injection current frequency range:
For making impedance ground value need the least close to grounding resistance, grounding body induction reactance part, 2 π fLx/Rx→ 0,
If injection current upper frequency limit value determines that function Δ (f) is: Δ (f)=2 π fLx/Rx, wherein LxFor tested tower grounding body electricity
Sense, RxTested tower grounding bulk resistor, f is injection current frequency, and Δ (f) is that higher limit determines function.
When i.e. condition is converted into Δ (f) → 0, can meet the requirement of accurately measurement, simulation calculation can obtain, the value of Δ (f)
It is gradually increased along with the increase of frequency, but the value of Δ (f) only levels off to and 0 just can reduce error, is guaranteeing measurement result
On the premise of accuracy, set the frequency values of Δ (f)=0.05 correspondence as upper frequency limit value, according under different soils resistivity
Earth resistance standard, calculates the higher limit of injection current frequency.
The present invention also provides for a kind of accurate measurement apparatus of pole tower ground resistance, including driving source module, signal acquisition module,
Signal pre-processing module, central processing module and display module, described driving source module, to tower grounding body injection current, is passed through
Tower grounding body, electric current pole form loop with driving source module；The outfan of driving source module is connected with centre module；Signal
The input of acquisition module is connected with voltage pole, the input phase of the outfan of signal acquisition module and signal pre-processing module
Even；The outfan of signal pre-processing module is connected with the input of central processing module；Display module is defeated with central processing module
Go out end to be connected.
The technical scheme that the present invention provides can not turn off ground lead and realizes the accurate measurement to pole tower ground resistance value,
First pass through and grounding body is buried underground the judgement in orientation realize vertical cloth pole, improve the accuracy measured；Secondly by attached to shaft tower
The power frequency measuring selection injection of nearly soil resistivity, improves the measuring method adaptability to different shaft tower soil environments；
Without disconnecting ground lead, improve the work efficiency of measurement of Grounding Resistance.For the calculating of pole tower ground resistance, use meansigma methods
Method, makes measurement error minimize, and promotes the accuracy of measurement result.
Accompanying drawing explanation
Fig. 1 is the measuring circuit figure of patent of the present invention；
Fig. 2 is the Distribution of Magnetic Field figure that shaft tower horizontal grounding objects produces at soil surface；
Fig. 3 is not turn off ground lead to measure pole tower ground resistance physical model；
Fig. 4 is that pole tower ground resistance accurately measures Simplified equivalent model；
Fig. 5 is the circuit diagram that soil resistivity is measured；
Fig. 6 is that δ (f) is with injection current frequency f change curve；
Fig. 7 is frequency-selecting type pole tower ground resistance measurement apparatus structure chart.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme is described further:
1, pole tower ground resistance Accurate measurement, its wiring diagram is with reference to Fig. 1, and core comprises the following steps:
1) use what magnetic field method judged grounding body to bury orientation underground, so that it is determined that the cloth set direction of electrode；
Before measurement work starts, injection current in tower grounding body, warp after the grounded body of electric current and soil diffusing
Another electrode reclaims and forms magnetic field at soil surface.Due to band steel that shaft tower horizontal grounding objects more options cross section is rectangle or
Circular round steel, when electric current flows through grounding body, can be equivalent to shaft tower horizontal grounding objects limit for length's straight current carrying conductor model and enter
Row calculates, and the model after equivalence is as shown in Figure 2.Calculate and understand, soil surface any point P (x, y, 0) place magnetic induction density B:
In formula, μ is the pcrmeability of soil, and I is for measuring current effective value, and h is the buried depth of grounding body, For P point and bar
Tower grounding body two ends line and the vertical line angle of grounding body, L is the length of grounding body.
Understanding, the maximum of magnetic induction is positioned at the surface of shaft tower horizontal grounding objects, along with the skew of position, magnetic strength
Intensity is answered to be gradually reduced.Utilize the distribution situation in detection of magnetic field instrument detection soil surface magnetic field, owing to electric current mainly connects along shaft tower
Terrain flows, and with Current injection points as the center of circle, distance decanting point a distance is divided for magnetic induction on radius measurement circumference
Cloth, magnetic induction strength is tower grounding body and buries orientation underground, is designated as an E.Same method is at the circle of distance decanting point b
Measure the distribution of magnetic induction on week, show that tower grounding body buries orientation underground, be designated as the line direction of a F, some E and some F i.e.
Orientation is buried underground for tower grounding body.
2) high frequency electric is injected as measuring electric current, it is to avoid disconnecting ground lead during measurement, measurement result comprises and connects
Ground lead resistance value, improves measurement result accuracy；
Measuring circuit is identical with three electrode method measuring circuit, and boost voltage pole P and auxiliary current pole C is arranged in and is perpendicular to shaft tower
Grounding body is buried underground on the direction in orientation, voltage pole is arranged in potential compensation point (be computed voltage pole P distance grounding body G away from
From 0.618 times of the distance for electric current pole C distance grounding body G, now the current potential at P is 0).
High-frequency ac current is injected, along with frequency and the raising of soil resistivity, the inductive effect of shaft tower in grounding body
More and more obvious, can obtain not turning off ground lead and measure pole tower ground resistance physical model as it is shown on figure 3, injection current isWhereinCurrent loop is defined by tower grounding body, soil and electric current pole, andBy shaft tower, lightning conducter
And shaft tower around forms current loop.If the lightning conducter induction reactance of shaft tower both sides to be asked, lightning conducter resistance, shaft tower resistance, bar
Tower induction reactance, earth resistance and grounding body equivalent inductive reactance summation are Zeq=j ω Leq+Req, wherein LeqFor lightning conducter equivalent inductance, Req
For lightning conducter equivalent resistance, after equivalence, circuit model is as shown in Figure 4.Being computed understanding, tower-footing impedance value changes with frequency f
Expression formula:
In formula: LxFor tower grounding body inductance, RxFor tower grounding bulk resistor.
Not turning off the condition that ground lead pole tower ground resistance accurately measures is:
| Z (f) | "=0 (3)
3) by the measurement to soil resistivity, determine the frequency range of injection current, record one group of pole tower ground resistance
Measured value, revises measurement result, draws the measurement exact value of pole tower ground resistance.
Utilizing four-electrode method to measure soil soil resistivity near grounding body, its measuring circuit is as it is shown in figure 5, use
Four electric current cloth poles, wherein two electrodes of A, B constitute current loop, and two electrodes of C, D are used for measuring the potential difference of soil surface,
Thus utilize the relation of voltage x current to calculate ρ value.
In figure, a1, a2For electric current pole A and potential pole C, the spacing of D, a3, a4For electric current pole B and potential pole C, the spacing of D,
Equally, four electrodes need to carry out cloth pole along same straight line, and the degree of depth of cloth pole is h, is a between each electrode, its cloth pole
Degree of depth h be less than 1/20 of spacing a equal to each electrode, i.e. h≤a/20, opposite two voltage poles in electric current pole produce
Current potential be:
V1=I ρ/2 π (1/a-1/2a)
V2=I ρ/2 π (1/2a-1/a)
So the potential difference between two voltage poles is:
V=V1-V2=I ρ/2 π a
Therefore deduce that soil resistivity is:
ρ=2 π aV/I=2 π aRg (4)
In formula, a is interelectrode distance, RgElectric resistance of soil for actual measurement.
From formula (4), when a is known, measures the voltage between C, D electrode and flow through the electric current of A, B electrode,
To calculate soil resistivity.
According to the soil resistivity recorded, high-frequency method measurement requirement grounding resistance is far longer than grounding body induction reactance value and remote
Much smaller than lightning conducter induction reactance value, it may be assumed that
By Rx=10 Ω, Lx=10 μ H, Leq=10mH substitutes in formula (4) and obtains:
159Hz<<f<<159kHz (6)
Above formula has obtained a wide in range injection current frequency range of comparison, in conjunction with practical measurement requirement, by frequency-selecting type bar
The injection current frequency range of tower earth resistance primarily determines that as 1kHz～15kHz, i.e. in the range of 1kHz～15kHz every
1kHz measures.Measure within the range and obtain many class frequencys value, and process according to the discrete data obtained by measuring,
Obtain optimum frequency point, solve grounding resistance.
Owing to, under different soil resistivity environment, the standard value of pole tower ground resistance is also not quite similar, if every base shaft tower
Value all use identical standard value, inject the electric current of same frequency, error also can increase therewith, it is therefore necessary to analyzes not
Injection current frequency range with soil resistivity section.
The most tentatively being deduced a preliminary injection current frequency range in formula (6) is 1～15kHz, then according to table 1
In earth resistance standard value, by building two mathematical functions, determine respectively the higher limit of injection current frequency range with
Lower limit.
Pole tower ground resistance standard value under table 1 different soils resistivity
A) determination of injection current lower-frequency limit value
If injection current lower-frequency limit function δ (f) is:
When δ (f) → 0 in formula (7), i.e. can meet the accurate measuring condition of formula, therefore, choose frequency-selecting type tower grounding electricity
The canonical parameter that resistance is measured brings this formula into, draws out the curve chart that δ (f) changes with frequency f, as shown in Figure 6.
According to this curve it can be seen that when earth resistance standard value changes to 30 Ω from 10 Ω, function δ (f) changes width
Degree is the most little, and when f value after 1kHz, the variable quantity of the value of δ (f) is the least, nearly close to zero.Determined before in conjunction with
The lower limit of preliminary frequency scope, in different soils electrical resistivity range, the lower limit of injection current frequency all can set
For 1kHz.
B) determination of injection current upper frequency limit value
For making impedance ground value need the least close to grounding resistance, grounding body induction reactance part, (5) are converted
For: 2 π fLx/Rx→ 0, if injection current upper frequency limit value determines that function Δ (f) is:
Δ (f)=2 π fLx/Rx (8)
When i.e. condition is converted into Δ (f) → 0, the requirement of accurately measurement can be met.Simulation calculation can obtain, the value of Δ (f)
It is gradually increased along with the increase of frequency, but the value of Δ (f) only levels off to and 0 just can reduce error, is guaranteeing measurement result
On the premise of accuracy, set the frequency values of Δ (f)=0.05 correspondence as upper frequency limit value, ensureing have enough frequency bands to enter
While row frequency-selecting processes, also can meet the condition of accurately measurement.Then can determine that under different soils resistivity, injection current frequency
The higher limit of rate.
By a), b) can determine that under different soils resistivity, the frequency range of injection current frequency-selecting, as shown in table 2.Determine note
After entering current frequency range, the tower grounding body of soil resistivity injects near known 10 groups of different frequencies of selected frequency range
Electric current (averagely selecting 10 class frequencys in selected frequency range), measurement of Grounding Resistance value, obtain the flat of 10 groups of measurement of Grounding Resistance values
Average, obtains the accurate measurements of pole tower ground resistance.
Current frequency range is injected under table 2 different soils resistivity
2, frequency-selecting type pole tower ground resistance measurement apparatus is with reference to Fig. 7, and its composition and module connection are as follows: this device bag
Include driving source module 1, signal acquisition module 2, signal pre-processing module 3, central processing module 4 and display module 5, described excitation
Source module 1 is to tower grounding body injection current, by tower grounding body, electric current pole C) form loop with driving source module 1；Excitation
The outfan of source module 1 is connected with centre module 4；The input of signal acquisition module 2 is connected with voltage pole P, signals collecting
The outfan of module 2 is connected with the input of signal pre-processing module 3；The outfan of signal pre-processing module 3 processes with central authorities
The input of module 4 is connected；Display module 5 is connected with central processing module 4 outfan.In this device, central processing module 4 is adopted
With the high-performance microprocessor STM32 of group of STMicw Electronics.
Apparatus of the present invention are a kind of accurate measurement apparatus of frequency-selecting type pole tower ground resistance, it is possible to do not turning off ground lead
In the case of accurately measure the grounding resistance of shaft tower, and use averaging method that measurement data being processed such that, error reaches
To minimum, it it is one measuring method accurately and efficiently.By soil resistivity being measured the electric current frequency selecting to inject grounding body
The voltage gathered, current signal input central authorities after amplification, filtering, conversion process are processed by rate by signal acquisition module
Module (single-chip microcomputer) calculates tested pole tower ground resistance value, 10 groups that during calculating at this, frequency-selecting is calculated by employing mean value method
Measurement of Grounding Resistance value result processes, so that overall calculation error is minimum, accurately reflects grounding resistance.
Claims (5)
1. a pole tower ground resistance Accurate measurement, it is characterised in that comprise the following steps:
1) pole tower ground resistance buries the detection in orientation underground, uses what magnetic field method judged grounding body to bury orientation underground, so that it is determined that electrode
Cloth set direction；
2) four-electrode method is utilized to measure the soil resistivity of soil near grounding body；
3) use the cloth pole mode of three electrode method to measure the laying of electrode, select injection current frequency model according to soil resistivity
Enclose, inject one group of electric current in this frequency range to tower grounding body, calculate one group of resistance value to be measured respectively, and utilize flat
Described one group of resistance value to be measured is calculated by all methods, draws the measured value of pole tower ground resistance.
A kind of pole tower ground resistance Accurate measurement, it is characterised in that: step 1) described magnetic field
Method judge grounding body bury orientation underground particularly as follows: in tower grounding body injection current, the grounded body of electric current and soil diffusing it
Reclaim by electrode and form magnetic field at soil surface；Utilize the distribution situation in detection of magnetic field instrument detection soil surface magnetic field, with
Current injection points is the center of circle, and distance decanting point a distance is Magnetic Induction Density Distribution on radius measurement circumference, and magnetic induction is the strongest
Place is tower grounding body and buries orientation underground, is designated as an E, in like manner measures magnetic induction on the circumference of distance decanting point b distance
Distribution, show that tower grounding body buries orientation underground, be designated as a F, some E and the line direction putting F are burying underground of tower grounding body
Orientation.
A kind of pole tower ground resistance Accurate measurement, it is characterised in that: step 3) described basis
Soil resistivity selects injection current frequency range, carries out injection current frequency range selection according to following relation:
A kind of pole tower ground resistance Accurate measurement, it is characterised in that: described injection current frequency
Being defined below of rate scope:
Wherein higher limit: for making impedance ground value need the least close to grounding resistance, grounding body induction reactance part, 2 π
fLx/Rx→ 0, if injection current upper frequency limit value determines that function Δ (f) is: Δ (f)=2 π fLx/Rx,
When i.e. condition is converted into Δ (f) → 0, can meet the requirement of accurately measurement, simulation calculation can obtain, the value of Δ (f) along with
The increase of frequency and be gradually increased, but the value of Δ (f) only levels off to and 0 just can reduce error, is guaranteeing that measurement result is accurate
On the premise of property, set the frequency values of Δ (f)=0.05 correspondence as upper frequency limit value, according to the ground connection under different soils resistivity
Resistance standard, calculates the higher limit of injection current frequency.
5. use the accurate measurement apparatus of pole tower ground resistance of pole tower ground resistance Accurate measurement described in claim 1, its
It is characterised by: described device includes that driving source module (1), signal acquisition module (2), signal pre-processing module (3), central authorities process
Module (4) and display module (5), described driving source module (1) is to tower grounding body injection current, by tower grounding body, electricity
Stream pole (C) forms loop with driving source module (1)；The outfan of driving source module (1) is connected with centre module (4)；Signal
The input of acquisition module (2) is connected with voltage pole (P), the outfan of signal acquisition module (2) and signal pre-processing module (3)
Input be connected；The outfan of signal pre-processing module (3) is connected with the input of central processing module (4)；Display module
(5) it is connected with central processing module (4) outfan.
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| CN106526423A (en) * | 2016-11-16 | 2017-03-22 | 中国电力科学研究院 | Method and system for informatization management for transmission line tower grounding resistance data |
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| CN108152597A (en) * | 2018-01-05 | 2018-06-12 | 重庆大学 | A kind of earthing pole etch state diagnostic device and method based on relative to ground resistance |
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| CN109188090A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | The nonlinear test method of different humidity electric resistance of soil in vertical demixing soil |
| CN109470928A (en) * | 2018-06-26 | 2019-03-15 | 国网浙江省电力有限公司衢州供电公司 | The method of cloth pole measurement pole tower ground resistance in column foot |
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| CN110879312A (en) * | 2018-09-06 | 2020-03-13 | 余振邦 | Method and device for measuring grounding impedance |
| CN111077350A (en) * | 2019-12-16 | 2020-04-28 | 云南电网有限责任公司西双版纳供电局 | Galvanized electrode system for pole tower grounding state test and detection method |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0864873B1 (en) * | 1997-03-12 | 2003-11-19 | Siemens Aktiengesellschaft | Procedure for determining the grounding resistance and house wiring adapted for same |
| CN103529304A (en) * | 2013-10-25 | 2014-01-22 | 国家电网公司 | Optimization method of on-site ground resistance testing technology of ground grid of electric power equipment |
| CN103954843A (en) * | 2014-05-21 | 2014-07-30 | 重庆大学 | Method for determining injection current frequency range in tower ground resistance measurement process without disconnecting ground lead |
| CN104155525A (en) * | 2014-05-14 | 2014-11-19 | 国家电网公司 | Multi-frequency scanning type tower grounding resistance measurement apparatus and method |
| CN204044250U (en) * | 2014-05-14 | 2014-12-24 | 国家电网公司 | A kind of multi-frequency scanning formula pole tower ground resistance measurement mechanism |
| CN104535844A (en) * | 2015-01-20 | 2015-04-22 | 国网辽宁省电力有限公司抚顺供电公司 | Method for testing grounding resistance of tower by using disassembly-free down conductor |
| CN105021897A (en) * | 2015-08-17 | 2015-11-04 | 国网辽宁省电力有限公司抚顺供电公司 | Tower grounding resistance measurement apparatus without dismounting of grounding down lead, and measurement method thereof |
| CN105182183A (en) * | 2015-09-24 | 2015-12-23 | 国网山西省电力公司临汾供电公司 | Method for remotely detecting corrosion state of horizontal voltage equalizing conductor of transformer substation grounding grid |
| CN105608269A (en) * | 2015-12-21 | 2016-05-25 | 云南电网有限责任公司电力科学研究院 | Estimation method of beam length of 500V power transmission line tower pole grounding body |
-
2016
- 2016-08-09 CN CN201610647763.4A patent/CN106093589B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0864873B1 (en) * | 1997-03-12 | 2003-11-19 | Siemens Aktiengesellschaft | Procedure for determining the grounding resistance and house wiring adapted for same |
| CN103529304A (en) * | 2013-10-25 | 2014-01-22 | 国家电网公司 | Optimization method of on-site ground resistance testing technology of ground grid of electric power equipment |
| CN104155525A (en) * | 2014-05-14 | 2014-11-19 | 国家电网公司 | Multi-frequency scanning type tower grounding resistance measurement apparatus and method |
| CN204044250U (en) * | 2014-05-14 | 2014-12-24 | 国家电网公司 | A kind of multi-frequency scanning formula pole tower ground resistance measurement mechanism |
| CN103954843A (en) * | 2014-05-21 | 2014-07-30 | 重庆大学 | Method for determining injection current frequency range in tower ground resistance measurement process without disconnecting ground lead |
| CN104535844A (en) * | 2015-01-20 | 2015-04-22 | 国网辽宁省电力有限公司抚顺供电公司 | Method for testing grounding resistance of tower by using disassembly-free down conductor |
| CN105021897A (en) * | 2015-08-17 | 2015-11-04 | 国网辽宁省电力有限公司抚顺供电公司 | Tower grounding resistance measurement apparatus without dismounting of grounding down lead, and measurement method thereof |
| CN105182183A (en) * | 2015-09-24 | 2015-12-23 | 国网山西省电力公司临汾供电公司 | Method for remotely detecting corrosion state of horizontal voltage equalizing conductor of transformer substation grounding grid |
| CN105608269A (en) * | 2015-12-21 | 2016-05-25 | 云南电网有限责任公司电力科学研究院 | Estimation method of beam length of 500V power transmission line tower pole grounding body |
Non-Patent Citations (1)
| Title |
|---|
| 许晓: "多频电流注入式杆塔接地电阻测量装置及应用研究", 《中国优秀硕士学位论文全文数据库 信息科技II辑》 * |
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108663573A (en) * | 2017-03-29 | 2018-10-16 | 南方电网科学研究院有限责任公司 | A kind of Tower Impulse Grounding Resistance measurement method |
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| CN108152597B (en) * | 2018-01-05 | 2020-07-31 | 重庆大学 | Grounding electrode corrosion state diagnosis device and method based on relative grounding resistance |
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| CN110879312B (en) * | 2018-09-06 | 2021-08-24 | 余振邦 | Method and device for measuring grounding impedance |
| CN109581065A (en) * | 2018-12-18 | 2019-04-05 | 国家电网公司 | Pole tower ground resistance measuring system based on multi-frequency scanning principle |
| CN109782071A (en) * | 2019-03-11 | 2019-05-21 | 重庆大学 | A kind of pole tower ground resistance measurement method based on Earth Surface voltage |
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| CN110850176A (en) * | 2019-12-06 | 2020-02-28 | 云南电网有限责任公司昆明供电局 | Graphite-based flexible grounding resistance measurement method |
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| CN111077350B (en) * | 2019-12-16 | 2021-09-28 | 云南电网有限责任公司西双版纳供电局 | Galvanized electrode system for pole tower grounding state test and detection method |
| CN111351988A (en) * | 2019-12-29 | 2020-06-30 | 武昌首义学院 | Intelligent tower grounding resistance measuring system and method based on mobile internet |
| CN112114199A (en) * | 2020-08-17 | 2020-12-22 | 国家电网有限公司 | Method for measuring grounding resistance of transmission tower |
| CN111948482A (en) * | 2020-08-24 | 2020-11-17 | 西南交通大学 | Grounding electrode frequency sensitivity characteristic test evaluation method considering temperature and soil type |
| CN111948482B (en) * | 2020-08-24 | 2021-06-29 | 西南交通大学 | Grounding electrode frequency sensitivity characteristic test evaluation method considering temperature and soil type |
| CN112924758A (en) * | 2021-01-19 | 2021-06-08 | 重庆大学 | Impulse grounding resistance measurement method based on pilot frequency impedance |
| CN112924758B (en) * | 2021-01-19 | 2023-08-11 | 重庆大学 | Different-frequency impedance-based impact grounding resistance measurement method |
| CN112946368A (en) * | 2021-02-02 | 2021-06-11 | 长春工程学院 | Tower grounding resistance synchronous detection method based on multi-source parameter fusion analysis |
| CN113009237A (en) * | 2021-03-03 | 2021-06-22 | 广东电网有限责任公司 | Tower grounding resistance measurement method and device based on frequency fitting algorithm |
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