CN102854390A - Soil resistivity measuring method - Google Patents
Soil resistivity measuring method Download PDFInfo
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- CN102854390A CN102854390A CN2012103866929A CN201210386692A CN102854390A CN 102854390 A CN102854390 A CN 102854390A CN 2012103866929 A CN2012103866929 A CN 2012103866929A CN 201210386692 A CN201210386692 A CN 201210386692A CN 102854390 A CN102854390 A CN 102854390A
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Abstract
The embodiment of the invention discloses a soil resistivity measuring method comprising the following steps of: distributing a first ground pile, a second ground pile, a third ground pile and a fourth ground pile on the same line and driving the ground piles into the ground, wherein the distance between the first ground pile and the second ground pile is set to be equal to the distance between the third ground pile and the fourth ground pile; setting the depths of the first ground pile, the second ground pile, the third ground pile and the fourth ground pile driven into the ground to be same and 1/20 smaller than the distance between the first ground pile and the second ground pile; connecting the anode of a power supply with the first ground pile, and the cathode with the fourth ground pile, wherein the power supply has a set frequency difference with the power frequency; acquiring a resistance value between the third ground pile and the fourth ground pile; and calculating the resistivity of the soil by taking the distance and the resistance value between the first ground pile and the second ground pile as well as the distance and the resistance value between the third ground pile and the fourth ground pile according to a preset formula. According to the embodiment of the invention, the size of the measured power supply is reduced effectively, and the work intensity of a tester is relieved.
Description
Technical field
The present invention relates to power domain, more particularly, relate to a kind of soil resistivity measuring method.
Background technology
In the last few years; domestic many places transformer station forms the expansion accident because of thunderbolt; most defective relevant with ground network ground resistance; grounded screen plays a part working earthing and protective ground; when stake resistance is excessive when then earth fault occuring; neutral point voltage skew is increased, may make mutually sound and neutral point voltage too high, above the level of insulating requirements and cause damage of equipment.
Soil resistivity is the key factor that determines stake resistance, for the appropriate design earthing device, must survey soil resistivity, in order to make the calculating parameter of stake resistance of actual measurement resistivity.
In the prior art, the general resistivity that adopts the power frequency heavy-current method to measure soil, owing in the earth, see the probably larger zero-sequence current of existence, especially be in transformer station in service and that outlet is more, not only can flow into the measurement current return at zero-sequence current, affect the reading of electric current, but also can form step-down at voltage circuit, affect the reading of voltage.
So in the prior art, rules require when measuring, test current must not be less than 50A with the impact of reduce disturbance on measurement result, thus, and the problems such as it is heavy testing equipment just to have occurred, and process of the test is complicated, and the testing crew working strength is large.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of soil resistivity measuring method.
The embodiment of the invention is achieved in that
A kind of soil resistivity measuring method comprises:
With the first pile, the second pile, the 3rd pile and the 4th pile in same lineal layout setting and be driven underground, the distance between described the first pile and the second pile be made as with the 3rd pile and the 4th pile between distance equate;
The degree of depth that described the first pile, the second pile, the 3rd pile and the 4th pile are driven underground is made as identical, and the described degree of depth is less than 1/20 of the distance between described the first pile and the second pile;
To be connected described the first pile with the positive source that power frequency differs setpoint frequency, negative pole connects described the 4th pile;
Obtain the resistance value of electric resistance of soil between the 3rd pile and the 4th pile;
Take the distance between the distance between described the first pile and the second pile, described the second pile and the 3rd pile and described resistance value as parameter, calculate the resistivity of soil according to default formula.
Preferably, in embodiments of the present invention, resistance value between described the 3rd pile and the 4th pile is being located at the measured magnitude of voltage of voltage table between described the 3rd pile and the 4th pile, and the measured current value of reometer of being located between the first pile and the second pile is that calculation of parameter obtains.
Preferably, in embodiments of the present invention, the distance between described the first pile and the second pile be made as with the second pile and the 3rd pile between distance equate.
Preferably, in embodiments of the present invention, the distance between described the first pile and the second pile is made as 5m, 10m, 20m, 30m or 40m.
Preferably, in embodiments of the present invention, described default formula comprises:
ρ=2 π aR(a+b)/b; Wherein, ρ is resistivity; A is the distance between described the first pile and the second pile; B is the distance between described the 3rd pile and the 4th pile; R is the resistance value of electric resistance of soil between described the 3rd pile and the 4th pile.
Preferably, in embodiments of the present invention, described default formula comprises:
ρ=2 π aR; Wherein, ρ is resistivity; A is the distance between described the first pile and the second pile; R is the resistance value of electric resistance of soil between described the 3rd pile and the 4th pile.
Preferably, in embodiments of the present invention, described setpoint frequency is 5 hertz.
Preferably, in embodiments of the present invention, the supply current of described power supply is set to 1 to 5 ampere.
Can find out from above-mentioned technical scheme, in embodiments of the present invention, by with the first pile, the second pile, the 3rd pile and the 4th pile in same lineal layout setting and be driven underground, and adopt the electric current of non-power frequency to come to the first pile and the 4th pile input current.By measuring current value, and the resistance value between the second pile, the 3rd pile, thereby can draw by the resistivity formula resistance value of soil; Because in embodiments of the present invention, adopt the electric current of non-power frequency to measure, so avoided power frequency to measuring the interference of electric current, so also just needn't adopt measuring of large electric current, because the volume of low current power supply is little, easy and simple to handle, so the embodiment of the invention has reduced to measure the volume of power supply effectively, alleviated the working strength of testing crew.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic flow sheet of soil resistivity measuring method described in the embodiment of the invention;
Fig. 2 is that the installation of used each equipment of soil resistivity measuring method described in the embodiment of the invention consists of synoptic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
In the prior art, adopt the power frequency heavy-current method to come grounding apparatus is carried out the measurement of soil resistivity, in this mode, rules require test current less than 50A, thus, the testing equipment heaviness just to have occurred, the problems such as process of the test is complicated, and the testing crew working strength is large.
For this reason, as depicted in figs. 1 and 2, in embodiments of the present invention, provide a kind of soil resistivity measuring method, having comprised:
S11, with the first pile 1, the second pile 2, the 3rd pile 3 and the 4th pile 4 in same lineal layout setting and be driven underground, the distance between described the first pile 1 and the second pile 2 be made as with the 3rd pile 3 and the 4th pile 4 between distance equate;
S12, the degree of depth that described the first pile 1, the second pile 2, the 3rd pile 3 and the 4th pile 4 are driven underground are made as identical, and the degree of depth is less than 1/20 of the distance between described the first pile 1 and the second pile 2;
S13, will differ with power frequency that the power supply 5 of setpoint frequency is anodal to be connected described the first pile 1, negative pole connects described the 4th pile 4;
S14, obtain the resistance value between the 3rd pile 3 and the 4th pile 4;
Distance between S15, the distance take between described the first pile 1 and the second pile 2, described the second pile 2 and the 3rd pile 3 and resistance value are calculated the resistivity of soil as parameter according to default formula.
In the prior art, when measuring soil resistivity, use power current to measure and to cause interference, just can obtain comparatively accurate result more than 50 amperes so the measurement electric current need to be enlarged to; Because the electric current more than 50 amperes need to be provided, institute is so that measurement device body is long-pending very large, and process of the test is complicated, and then so that experimenter's working strength is larger.
In the embodiment of the invention, adopt the electric current different from work frequency as measuring electric current, thereby greatly avoided the interference of power current, because it is less to be subject to the interference of power current, so just can obtain more accurate measurement result by less measurement electric current.In the practical application, during soil resistivity method in implementing the embodiment of the invention, at first on tested ground, four piles be straight line hammer into underground; Wherein the distance between the first pile and the second pile be made as with the 3rd pile and the 4th pile between distance equate that is to say, the pile at two ends equates with the distance of adjacent pile.In addition, the degree of depth that also needs each pile to be hammered into ground is made as unanimously.At this moment, can connect the first pile and loop of the 4th pile formation by stabilized voltage supply, concrete, in embodiments of the present invention, can be that positive source is connected described the first pile, negative pole connects described the 4th pile; Need to prove that in embodiments of the present invention, the frequency of power supply is different from power frequency, but differ the frequency of setting with power frequency, such as, can be 45 hertz or 55 hertz.Because measurement power frequency and power current frequency phase-difference in the embodiment of the invention are little, so the error of the result who records and actual result is very little, thereby so that net result is comparatively accurate.
Need larger current value different from the electric current of power supply in the prior art with adopting power current, in embodiments of the present invention, what the electric current of power supply can be arranged is much smaller, concrete, can be any current value in 1 ampere to 5 amperes.
In embodiments of the present invention, by being located at the measured magnitude of voltage of voltage table between the 3rd pile and the 4th pile, and the measured current value of reometer of being located between the first pile and the second pile is parameter, after calculating the resistance value of winning the third place between pile and the 4th pile, can take the distance between distance, the second pile and the 3rd pile between the first pile and the second pile and resistance value as parameter, calculate the resistivity of soil according to default formula.
Concrete default formula can be ρ=2 π aR(a+b)/b; Wherein, ρ is resistivity; A is the distance between described the first pile and the second pile; B is the distance between described the 3rd pile and the 4th pile; R is the resistance value of electric resistance of soil between described the 3rd pile and the 4th pile.
Preferably, in embodiments of the present invention, the distance between the first pile and the second pile can also be made as with the second pile and the 3rd pile between distance equate i.e. a=b; At this moment, concrete default formula can be ρ=2 π aR; Wherein, ρ is resistivity; A is the distance between described the first pile and the second pile; R is the resistance value of electric resistance of soil between described the 3rd pile and the 4th pile.
In sum, in embodiments of the present invention, by with the first pile, the second pile, the 3rd pile and the 4th pile in same lineal layout setting and be driven underground, and adopt the electric current of non-power frequency to come to the first pile and the 4th pile input current.By measuring current value, and the resistance value between the second pile, the 3rd pile, thereby can draw by the resistivity formula resistance value of soil; Because in embodiments of the present invention, adopt the electric current of non-power frequency to measure, so avoided power frequency to measuring the interference of electric current, so also just needn't adopt measuring of large electric current, because the volume of low current power supply is little, easy and simple to handle, so the embodiment of the invention has reduced to measure the volume of power supply effectively, alleviated the working strength of testing crew.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation that does not break away from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a soil resistivity measuring method is characterized in that, comprising:
With the first pile, the second pile, the 3rd pile and the 4th pile in same lineal layout setting and be driven underground, the distance between described the first pile and the second pile be made as with the 3rd pile and the 4th pile between distance equate;
The degree of depth that described the first pile, the second pile, the 3rd pile and the 4th pile are driven underground is made as identical, and the described degree of depth is less than 1/20 of the distance between described the first pile and the second pile;
To be connected described the first pile with the positive source that power frequency differs setpoint frequency, negative pole connects described the 4th pile;
Obtain the resistance value between described the 3rd pile and the 4th pile;
Take the distance between the distance between described the first pile and the second pile, described the second pile and the 3rd pile and described resistance value as parameter, calculate the resistivity of soil according to default formula.
2. described soil resistivity measuring method according to claim 1, it is characterized in that, resistance value between described the 3rd pile and the 4th pile is being located at the measured magnitude of voltage of voltage table between described the 3rd pile and the 4th pile, and the measured current value of reometer of being located between the first pile and the second pile is that calculation of parameter obtains.
3. described soil resistivity measuring method according to claim 2 is characterized in that, the distance between described the first pile and the second pile be made as with the second pile and the 3rd pile between distance equate.
4. described soil resistivity measuring method according to claim 3 is characterized in that the distance between described the first pile and the second pile is made as 5m, 10m, 20m, 30m or 40m.
5. described soil resistivity measuring method according to claim 1 is characterized in that described default formula comprises:
ρ=2 π aR(a+b)/b; Wherein, ρ is resistivity; A is the distance between described the first pile and the second pile; B is the distance between described the 3rd pile and the 4th pile; R is the resistance value of electric resistance of soil between described the 3rd pile and the 4th pile.
6. described soil resistivity measuring method according to claim 2 is characterized in that described default formula comprises:
ρ=2 π aR; Wherein, ρ is resistivity; A is the distance between described the first pile and the second pile; R is the resistance value of electric resistance of soil between described the 3rd pile and the 4th pile.
7. described soil resistivity measuring method according to claim 6 is characterized in that described setpoint frequency is 5 hertz.
8. described soil resistivity measuring method according to claim 7 is characterized in that the supply current of described power supply is set to 1 to 5 ampere.
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| CN2012103866929A CN102854390A (en) | 2012-10-12 | 2012-10-12 | Soil resistivity measuring method |
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| CN2012103866929A CN102854390A (en) | 2012-10-12 | 2012-10-12 | Soil resistivity measuring method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941095A (en) * | 2014-05-13 | 2014-07-23 | 尚兵 | Method for testing electrical resistivity of earth around underground metallic conduit |
| CN104090169A (en) * | 2014-06-25 | 2014-10-08 | 河海大学 | Method for measuring ground resistance of ground screen in layered slope soil structure |
| CN110297071A (en) * | 2019-07-05 | 2019-10-01 | 上海交通大学 | Soil Parameters measurement method |
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| JP2007098300A (en) * | 2005-10-05 | 2007-04-19 | Teijin Fibers Ltd | Evaluation method of purification efficacy of contaminated soil |
| CN201081764Y (en) * | 2007-12-28 | 2008-07-02 | 重庆市防雷中心 | Remote soil resistivity monitor |
| CN101609058A (en) * | 2009-07-23 | 2009-12-23 | 中国农业大学 | A kind of measuring device of soil conductivity and method |
| US20110121845A1 (en) * | 2009-11-24 | 2011-05-26 | Klaus Laepple | Earth ground tester with remote control |
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| JP2007098300A (en) * | 2005-10-05 | 2007-04-19 | Teijin Fibers Ltd | Evaluation method of purification efficacy of contaminated soil |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941095A (en) * | 2014-05-13 | 2014-07-23 | 尚兵 | Method for testing electrical resistivity of earth around underground metallic conduit |
| CN103941095B (en) * | 2014-05-13 | 2016-05-04 | 尹春峰 | A kind of method that the resistivity of underground metallic conduit surrounding soil is tested |
| CN104090169A (en) * | 2014-06-25 | 2014-10-08 | 河海大学 | Method for measuring ground resistance of ground screen in layered slope soil structure |
| CN104090169B (en) * | 2014-06-25 | 2016-08-17 | 河海大学 | A kind of measure the method for ground network ground resistance in domatic stratified soil structure |
| CN110297071A (en) * | 2019-07-05 | 2019-10-01 | 上海交通大学 | Soil Parameters measurement method |
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Application publication date: 20130102 |