CN105785134B - Unpolarizable electrode ground resistance measurement method - Google Patents
Unpolarizable electrode ground resistance measurement method Download PDFInfo
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- CN105785134B CN105785134B CN201610150815.7A CN201610150815A CN105785134B CN 105785134 B CN105785134 B CN 105785134B CN 201610150815 A CN201610150815 A CN 201610150815A CN 105785134 B CN105785134 B CN 105785134B
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- unpolarizable
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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
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
Abstract
The present invention for it is a kind of not to unpolarizable electrode Injection Current, do not destroy the electrode ground resistance measurement method of unpolarizable electrode stability.It comprises the following steps：Two unpolarizable electrodes are embedded in big ground；First, second two impedance branch are connected in parallel between two unpolarizable electrodes；It connects the first impedance branch and disconnects the second impedance branch, measure the output voltage VO 2 between two unpolarizable electrodes at this time；It connects the second impedance branch and disconnects the first impedance branch, measure the output voltage VO 3 between two unpolarizable electrodes at this time；Two formula of simultaneous VO2 and VO3 solves the natural potential Vi of the earth and ground resistance Ri between two unpolarizable electrodes.This method can also simultaneously between measuring electrode while unpolarizable electrode ground resistance is measured natural potential.
Description
Technical field
The present invention relates to unpolarizable electrode ground resistance measurement method, for measuring the ground resistance of unpolarizable electrode and electricity
The natural potential of interpolar is used particularly suitable for carrying out the detection of geophysics electrical method in the field environment.
Background technology
At present, common electrode ground resistance measurement method is all to a certain size electric current of electrode injection, passes through measurement
Interelectrode voltage value measures the ground resistance of electrode indirectly.This kind of method, cannot due to needing to electrode injection electric current
It is measured for the ground resistance of unpolarizable electrode, because the electric current of injection can destroy the stabilization of electrode so that surveyed by the method
After measuring ground resistance, unpolarizable electrode is needed by that could work normally for quite a long time.
The content of the invention
In view of above-mentioned, be not required to the object of the present invention is to provide one kind to electrode injection electric current and measuring electrode ground resistance and
The measuring method of natural potential, to meet the needs of unpolarizable electrode ground resistance measurement.
For this purpose, the present invention uses following technical scheme：
A kind of unpolarizable electrode ground resistance measurement method, comprises the following steps：
1) measuring circuit step is constructed
Two unpolarizable electrodes are embedded in big ground, to pick up the natural electricity of the earth between two unpolarizable electrodes
Position；
The first impedance branch, the second impedance branch are connected in parallel between two unpolarizable electrodes, wherein：First impedance branch
Routing switch K2 and resistance R1 are composed in series, and the second impedance branch is composed in series by switching K3 and resistance R2；
2) the step of measuring unpolarizable electrode output
It connects the first impedance branch and disconnects the second impedance branch, measure the output electricity between two unpolarizable electrodes at this time
VO2, the VO2 is pressed to should be partial pressures of the Vi in R1 and Ri series arms on R1, i.e. VO2=Vi*R1/ (R1+Ri)；
It connects the second impedance branch and disconnects the first impedance branch, measure the output electricity between two unpolarizable electrodes at this time
VO3, the VO3 is pressed to should be partial pressures of the Vi in R2 and Ri series arms on R2, i.e. VO3=Vi*R2/ (R2+Ri)；
In two formula of above-mentioned VO2 and VO3, Vi is the natural potential of the earth between two unpolarizable electrodes, Ri for two not
The ground resistance of the earth between polarizing electrode；
3) natural potential and ground resistance step are calculated
Simultaneous two formula of above-mentioned VO2 and VO3 solves the natural potential Vi of the earth and ground connection electricity between two unpolarizable electrodes
Hinder Ri.
Further：
In the construction measuring circuit step, two input terminals of an amplifier are respectively connected to two electricity that do not polarize
The other end of pole；
In the step of measurement unpolarizable electrode output, measure, measure from the output terminal of the amplifier
VO2=G*Vi*R1/ (R1+Ri), VO3=G*Vi*R2/ (R2+Ri), G herein are the gain of the amplifier.
Further：
It is described construction measuring circuit step in, be connected in parallel between two unpolarizable electrodes one be made of K1 it is short
Road branch；
In the step of measurement unpolarizable electrode output：
Short circuit branch is connected first and disconnect the first impedance branch and the second impedance branch, the measurement amplifier at this time
Offset exports VO1；
Then the first impedance branch is connected again and disconnects short circuit branch and the second impedance branch, measures two unpolarizable electrodes
Between output voltage VO 2, VO2=G*Vi*R1/ (the R1+Ri)-VO1 at this time；
Finally connect the second impedance branch and disconnect short circuit branch and the first impedance branch, measure two unpolarizable electrodes it
Between output voltage VO 3, VO3=G*Vi*R2/ (the R2+Ri)-VO1 at this time.
The method of the present invention not only well solved common electrode ground resistance measurement method there are the problem of, simultaneously also
Interelectrode natural potential information can be obtained, is conducive to improve field work efficiency.
Description of the drawings
Fig. 1 is the measuring principle figure of the present invention；
Fig. 2 is the ground resistance of the present invention and self-potential survey circuit.
Specific embodiment
The present invention relates to a kind of unpolarizable electrode ground resistance measurement methods.
As shown in Figure 1.By two unpolarizable electrodes 1 be embedded in the earth 4 on, for pick up two unpolarizable electrodes 1 it
Between the earth natural potential.The other end of two unpolarizable electrodes 1 is connected to impedance switching and voltage amplifying part 2.
Impedance switching is made of with voltage amplifying part 2 switch, precision resistance and amplifier, it is produced for detecting the part
The natural potential that raw potential shift and the unpolarizable electrode of amplification pickup export under different input resistance.Pass through internal switch control
System, which, which realizes to the input short of impedance switching and voltage amplifying part and under different input resistance, picks up nature
The function of current potential.
Voltage measuring section 3 is made of voltmeter or other equipment that can accurately measure voltage, for measuring impedance switching
The voltage value exported with voltage amplifying part 2.Voltage measuring section 3 measures respectively comes from impedance switching and voltage amplifying part
Voltage signal V when 2 when input short, input impedance is R1 and input impedance is R201、V02、V03。
Finally by calculating, it is possible to obtain the ground resistance Ri of unpolarizable electrode and natural potential Vi.
It is considered that (be less than 1 second) in relatively short time in measurement process, the ground resistance of unpolarizable electrode and
Natural potential between two electrodes can keep stable.If natural potential is Vi, ground resistance Ri, the gain of amplifier is G,
Measuring circuit is as shown in Figure 2.
With reference to Fig. 2, the present invention will be described in detail.
Embodiment 1
The method of the present invention comprises the following steps：
1) measuring circuit step is constructed
Two unpolarizable electrodes are embedded in big ground, to pick up the natural electricity of the earth between two unpolarizable electrodes
Position；
First, second two impedance branch are connected in parallel between two unpolarizable electrodes, wherein：First impedance branch by
Switch K2 and resistance R1 is composed in series, and the second impedance branch is composed in series by switching K3 and resistance R2；
2) the step of measuring unpolarizable electrode output
It connects the first impedance branch and disconnects the second impedance branch, measure the output electricity between two unpolarizable electrodes at this time
VO2, the VO2 is pressed to should be partial pressures of the Vi in R1 and Ri series arms on R1, i.e. VO2=Vi*R1/ (R1+Ri)；
It connects the second impedance branch and disconnects the first impedance branch, measure the output electricity between two unpolarizable electrodes at this time
VO3, the VO3 is pressed to should be partial pressures of the Vi in R2 and Ri series arms on R2, i.e. VO3=Vi*R2/ (R2+Ri)；
In two formula of above-mentioned VO2 and VO3, Vi is the natural potential of the earth between two unpolarizable electrodes, Ri for two not
The ground resistance of the earth between polarizing electrode；
3) natural potential and ground resistance step are calculated
Simultaneous two formula of above-mentioned VO2 and VO3 solves the natural potential Vi of the earth and ground connection electricity between two unpolarizable electrodes
Hinder Ri.
Embodiment 2
It may be fainter in view of the natural potential signal of the earth between two unpolarizable electrodes.At this point, implementing
On the basis of example 1, increase an amplifier G, and two input terminals of amplifier G are respectively connected to the another of two unpolarizable electrodes
One end.
In the step of above-mentioned measurement unpolarizable electrode exports, measured from the output terminal of amplifier G, the VO2 measured
=G*Vi*R1/ (R1+Ri), VO3=G*Vi*R2/ (R2+Ri), G herein are the gain of the amplifier.
Embodiment 3：
In view of amplifier G, there may be offset voltages.In order to eliminate influence of the offset voltage to measurement result, it is necessary to
It measures the offset voltage and is eliminated.At this point, on the basis of embodiment 2, it is in parallel again between two unpolarizable electrodes to connect
Connect a short circuit branch being made of K1.
In the step of above-mentioned measurement unpolarizable electrode exports：
Short circuit branch is connected first and disconnects the first impedance branch and the second impedance branch, that is, is closed K1, is disconnected K2 and K3,
Measure the offset output VO1 of amplifier at this time；
Then connect the first impedance branch again and disconnect short circuit branch and the second impedance branch, that is, be closed K2, disconnect K1 and
K3 measures the output voltage VO 2 between two unpolarizable electrodes at this time；
Finally, connect and the second impedance branch and disconnect short circuit branch and the first impedance branch, that is, be closed K3, disconnect K1 and
K2 measures the output voltage VO 3 between two unpolarizable electrodes at this time.
Thus we can obtain following relational expression：
In above-mentioned linear equation in two unknowns group, two unknown numbers of only natural potential Vi and ground resistance Ri solve above-mentioned equation
Group solves：
It, can measuring electrode simultaneously it follows that the measuring method is under conditions of unpolarizable electrode Injection Current
Ground resistance and interelectrode natural potential.
Short-circuit switch of input K1 is introduced in the present invention, measuring amplifier offset voltage can be overcome well due to amplification
Device deviates the influence to measurement result.
The above embodiments do not form any type of limitation, power of the invention to protection domain of the presently claimed invention
Sharp claim covers all modifications and changes, therefore, makes various modifications for above-described embodiment and variation belongs to this
In the protection domain of invention.
Claims (3)
1. a kind of unpolarizable electrode ground resistance measurement method, it is characterised in that comprise the following steps：
1) measuring circuit step is constructed
Two unpolarizable electrodes are embedded in big ground, to pick up the natural potential of the earth between two unpolarizable electrodes；
The first impedance branch, the second impedance branch are connected in parallel between two unpolarizable electrodes, wherein：First impedance branch by
Switch K2 and resistance R1 is composed in series, and the second impedance branch is composed in series by switching K3 and resistance R2；
2) the step of measuring unpolarizable electrode output
It connects the first impedance branch and disconnects the second impedance branch, measure the output voltage between two unpolarizable electrodes at this time
VO2, the VO2 should be partial pressures of the Vi in R1 and Ri series arms on R1, i.e. VO2=Vi*R1/ (R1+Ri)；
It connects the second impedance branch and disconnects the first impedance branch, measure the output voltage between two unpolarizable electrodes at this time
VO3, the VO3 should be partial pressures of the Vi in R2 and Ri series arms on R2, i.e. VO3=Vi*R2/ (R2+Ri)；
In two formula of above-mentioned VO2 and VO3, Vi is the natural potential of the earth between two unpolarizable electrodes, and Ri does not polarize for two
The ground resistance of the earth between electrode；
3) natural potential and ground resistance step are calculated
Simultaneous two formula of above-mentioned VO2 and VO3 solves the natural potential Vi and ground resistance of the earth between two unpolarizable electrodes
Ri。
2. a kind of unpolarizable electrode ground resistance measurement method, it is characterised in that comprise the following steps：
Construct measuring circuit step
One end of two unpolarizable electrodes is embedded in big ground, to pick up the nature of the earth between two unpolarizable electrodes
Current potential；
Two input terminals of one amplifier are respectively connected to the other end of two unpolarizable electrodes；
The first impedance branch, the second impedance branch are connected in parallel between two unpolarizable electrodes, wherein：First impedance branch by
Switch K2 and resistance R1 is composed in series, and the second impedance branch is composed in series by switching K3 and resistance R2；
The step of measuring unpolarizable electrode output
It connects the first impedance branch and disconnects the second impedance branch, measure, measured at this time from the output terminal of the amplifier
Output voltage VO 2=G*Vi*R1/ (R1+Ri) between two unpolarizable electrodes；
It connects the second impedance branch and disconnects the first impedance branch, measure, measured at this time from the output terminal of the amplifier
Output voltage VO 3=G*Vi*R2/ (R2+Ri) between two unpolarizable electrodes；
In two formula of above-mentioned VO2 and VO3, Vi is the natural potential of the earth between two unpolarizable electrodes, and Ri does not polarize for two
The ground resistance of the earth between electrode, G are the gain of the amplifier；
Calculate natural potential and ground resistance step
Simultaneous two formula of above-mentioned VO2 and VO3 solves the natural potential Vi and ground resistance of the earth between two unpolarizable electrodes
Ri。
3. a kind of unpolarizable electrode ground resistance measurement method, it is characterised in that comprise the following steps：
Construct measuring circuit step
One end of two unpolarizable electrodes is embedded in big ground, to pick up the nature of the earth between two unpolarizable electrodes
Current potential；
Two input terminals of one amplifier are respectively connected to the other end of two unpolarizable electrodes；
The first impedance branch is connected in parallel between two unpolarizable electrodes, the second impedance branch and one are formed by switching K1
Short circuit branch, wherein：First impedance branch is composed in series by switching K2 and resistance R1, and the second impedance branch is by switching K3 and resistance
R2 is composed in series；
The step of measuring unpolarizable electrode output
Short circuit branch is connected first and disconnects the first impedance branch and the second impedance branch, measures the offset of the amplifier at this time
Amount output VO1；
Then connect the first impedance branch again and disconnect short circuit branch and the second impedance branch, from the output terminal of the amplifier into
Row measurement, measures the output voltage VO 2 between two unpolarizable electrodes, at this time VO2=G*Vi*R1/ (the R1+Ri)-VO1；
It finally connects the second impedance branch and disconnects short circuit branch and the first impedance branch, carried out from the output terminal of the amplifier
Measurement, measures the output voltage VO 3 between two unpolarizable electrodes, at this time VO3=G*Vi*R2/ (the R2+Ri)-VO1；
In two formula of above-mentioned VO2 and VO3, Vi is the natural potential of the earth between two unpolarizable electrodes, and Ri does not polarize for two
The ground resistance of the earth between electrode, G are the gain of the amplifier；
Calculate natural potential and ground resistance step
Simultaneous two formula of above-mentioned VO2 and VO3 solves the natural potential Vi and ground resistance of the earth between two unpolarizable electrodes
Ri。
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| CN106443196B (en) * | 2016-08-25 | 2017-12-19 | 中国科学院地质与地球物理研究所 | A kind of measuring system and method for electrode grounding resistance |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1584610A (en) * | 2003-08-19 | 2005-02-23 | 福建省电力勘测设计院 | Grounded resistance measuring apparatus |
| CN101825662B (en) * | 2010-05-28 | 2012-10-17 | 贵州南源电力科技开发有限公司 | Short-distance measurement method and structure of grounding resistance of grounding network |
| CN104777367A (en) * | 2015-03-23 | 2015-07-15 | 河南师范大学 | Ohmmeter-based grounding resistance measurement method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008298756A (en) * | 2007-06-04 | 2008-12-11 | Nippon Telegr & Teleph Corp <Ntt> | Ground resistance measuring device and ground resistance measurement method |
| JP5985420B2 (en) * | 2013-03-08 | 2016-09-06 | 日置電機株式会社 | Ground resistance meter and method for measuring ground resistance |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1584610A (en) * | 2003-08-19 | 2005-02-23 | 福建省电力勘测设计院 | Grounded resistance measuring apparatus |
| CN101825662B (en) * | 2010-05-28 | 2012-10-17 | 贵州南源电力科技开发有限公司 | Short-distance measurement method and structure of grounding resistance of grounding network |
| CN104777367A (en) * | 2015-03-23 | 2015-07-15 | 河南师范大学 | Ohmmeter-based grounding resistance measurement method |
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