CN111487468A - Ground network uncertainty measuring method based on resistivity - Google Patents
Ground network uncertainty measuring method based on resistivity Download PDFInfo
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- CN111487468A CN111487468A CN202010345607.9A CN202010345607A CN111487468A CN 111487468 A CN111487468 A CN 111487468A CN 202010345607 A CN202010345607 A CN 202010345607A CN 111487468 A CN111487468 A CN 111487468A
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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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Abstract
The invention discloses a method for measuring uncertainty of a ground network based on resistivity, which is used for measuring the reverse short distance of ground network ground resistance and comprises the following steps: s1 obtaining the resistivity rho of each average 4 points on five circles on the earth' S surface circle with the current as the center and the radius of 3m, 5m, 10m, 15m and 20m1，ρ2，…ρ20(ii) a S2 calculates the resistivity ρ on the surface circle at radii of 3m, 5m, 10m, 15m and 20m1，ρ2，…ρ20Average value of (d); s3 calculates the resistivity ρ on the surface circle at radii of 3m, 5m, 10m, 15m and 20m1，ρ2，…ρ20An average of the sum of the absolute values of the differences from the average; s4 from resistivity ρ1，ρ2，…ρ20And the evaluation of uncertainty of the measurement result caused by current pole addressing in reverse short-distance measurement of the grounding resistance of the ground network is realized by the average condition of the sum of the absolute values of the difference from the average value. The invention can realize the measurement junction caused by current pole address selection in the reverse short-distance measurement of the grounding resistance of the ground networkAnd (4) evaluating uncertain results.
Description
Technical Field
The invention relates to the technical field of power transmission and transformation, in particular to a ground grid uncertainty measuring method based on resistivity.
Background
The measurement of the grounding resistance of the grounding grid of the transformer substation in operation causes larger errors of test results due to the interference of the current flowing into the grounding grid by the system and the interference between test lead wires. Particularly, the test result of the grounding resistance of the large grounding grid is greatly influenced. The method for testing the grounding resistance of the grounding network is multiple, mainly two methods, namely a power frequency heavy current method and a pilot frequency power supply method, in order to improve the measurement accuracy, the former method adopts a method of increasing the test current to increase the signal to noise ratio to reduce the interference influence, but the increase of the test current makes the equipment heavy, and the interference problem cannot be completely solved; the latter mainly changes the frequency of the test current (generally about 120 Hz) so as to avoid 50Hz power frequency interference, but the method can not eliminate the interference between the test lead wires, and particularly when the overhead wires are used as the test lead wires, the error is quite large.
The arrangement workload of a current line and a resistivity line when the grounding resistance of a ground grid is measured by methods such as an included angle method and a straight line method recommended by the current industry standard D L/T475-2017 'grounding device characteristic parameter measurement guide' accounts for about 90% of the total workload of the whole ground grid resistance measurement, and the reverse short-distance measurement method of the grounding resistance of the ground grid can reduce the arrangement workload of the current line and the resistivity line by more than 50%.
Disclosure of Invention
The invention aims to provide a method for measuring uncertainty of a ground network based on resistivity, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for measuring uncertainty of a ground network based on resistivity is used for reverse short-distance measurement of ground network ground resistance and comprises the following steps:
s1, acquiring the resistivity rho of 4 points on each of five circles on the earth' S surface circle with the current as the center and the radiuses of 3m, 5m, 10m, 15m and 20m as the centers1，ρ2，…ρ20Total 20 points of resistivity data;
s2, calculating resistivity rho on the surface circle at the radius of 3m, 5m, 10m, 15m and 20m1，ρ2，…ρ20Average value of (d);
s3, calculating resistivity rho on the surface circle at the radius of 3m, 5m, 10m, 15m and 20m1，ρ2，…ρ20The absolute value of the difference from the mean valueThe average of the sums;
s4 dependence on resistivity ρ1，ρ2，…ρ20And the evaluation of uncertainty of the measurement result caused by current pole addressing in reverse short-distance measurement of the grounding resistance of the ground network is realized by the average condition of the sum of the absolute values of the difference from the average value.
Preferably, the resistivity ρ is calculated from the resistivities on the earth's surface circles centered on the current pole with radii of 3m, 5m, 10m, 15m and 20m1，ρ2，…ρ20Average value of (d):
ρaverage＝(ρ1+ρ2+…+ρ20)/20。
Preferably, the resistivity ρ on the surface circle at radii of 3m, 5m, 10m, 15m and 20m is calculated from the resistivity ρ on the surface circle at radii of 3m, 5m, 10m, 15m and 20m on the surface circle with the current pole as the center of the circle1，ρ2，…ρ20Average of the sum of absolute values of the differences from the average:
Δρtotal mean of＝(|ρ1-ρAverage|+|ρ2-ρAverage|+…+|ρ20-ρAverage|)/20。
Preferably, the uncertainty in the inverse short-range measurement of the earth-grid ground resistance caused by the soil structure near the current pole is approximately α,
compared with the prior art, the invention has the beneficial effects that: the method can realize the uncertain evaluation of the measurement result caused by current pole addressing in the reverse short-distance measurement of the grounding resistance of the grounding network.
Drawings
FIG. 1 is a flow chart illustrating a resistivity-based method of geonet uncertainty measurement according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a surface circle with current as a center and radii of 3m, 5m, 10m, 15m and 20 m.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-2, the present invention provides a technical solution: the invention provides the following technical scheme: a method for measuring uncertainty of a ground network based on resistivity is used for reverse short-distance measurement of ground network ground resistance and comprises the following steps:
s1, acquiring the resistivity rho of 4 points on each of five circles on the earth' S surface circle with the current as the center and the radiuses of 3m, 5m, 10m, 15m and 20m as the centers1，ρ2，…ρ20Total 20 points of resistivity data;
s2, calculating resistivity rho on the surface circle at the radius of 3m, 5m, 10m, 15m and 20m1，ρ2，…ρ20Average value of (d);
s3, calculating resistivity rho on the surface circle at the radius of 3m, 5m, 10m, 15m and 20m1，ρ2，…ρ20An average of the sum of the absolute values of the differences from the average;
s4 dependence on resistivity ρ1，ρ2，…ρ20And the evaluation of uncertainty of the measurement result caused by current pole addressing in reverse short-distance measurement of the grounding resistance of the ground network is realized by the average condition of the sum of the absolute values of the difference from the average value.
In the invention, the resistivity rho is calculated on the ground surface circles taking the current as the center of a circle and taking 3m, 5m, 10m, 15m and 20m as the radius1，ρ2，…ρ20Average value of (d):
ρaverage＝(ρ1+ρ2+…+ρ20)/20。
In the present invention, the resistivities ρ on a surface circle having radii of 3m, 5m, 10m, 15m and 20m are calculated from the resistivities ρ on the surface circle having radii of 3m, 5m, 10m, 15m and 20m on the basis of the current pole as the center of the circle1，ρ2，…ρ20Average of the sum of absolute values of the differences from the average:
Δρtotal mean of＝(|ρ1-ρAverage|+|ρ2-ρAverage|+…+|ρ20-ρAverage|)/20。
In the present invention, the uncertainty of the reverse short-range measurement of the earth-network ground resistance caused by the soil structure near the current pole is approximately α,
in conclusion, the method and the device can realize the estimation of uncertain measurement results caused by current pole addressing in the reverse short-distance measurement of the grounding resistance of the grounding network.
The invention is not described in detail, but is well known to those skilled in the art.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (4)
1. A method for measuring uncertainty of a ground network based on resistivity is used for reverse short-distance measurement of ground network ground resistance, and is characterized in that: the method comprises the following steps:
s1, acquiring the resistivity rho of 4 points on each of five circles on the earth' S surface circle with the current as the center and the radiuses of 3m, 5m, 10m, 15m and 20m as the centers1，ρ2，…ρ20Total 20 points of resistivity data;
s2, calculating resistivity rho on the surface circle at the radius of 3m, 5m, 10m, 15m and 20m1，ρ2，…ρ20Average value of (d);
s3, calculating resistivity rho on the surface circle at the radius of 3m, 5m, 10m, 15m and 20m1，ρ2，…ρ20An average of the sum of the absolute values of the differences from the average;
s4 dependence on resistivity ρ1，ρ2，…ρ20And the evaluation of uncertainty of the measurement result caused by current pole addressing in reverse short-distance measurement of the grounding resistance of the ground network is realized by the average condition of the sum of the absolute values of the difference from the average value.
2. The resistivity-based method of measuring uncertainty in a geonet according to claim 1, wherein: according to the principle that the current is extremely roundCalculating the resistivity rho on the ground surface circles with the centers at the radiuses of 3m, 5m, 10m, 15m and 20m1，ρ2，…ρ20Average value of (d):
ρaverage＝(ρ1+ρ2+…+ρ20)/20。
3. The resistivity-based method of measuring uncertainty in a geonet according to claim 1, wherein: calculating resistivities rho on the surface circle with the radius of 3m, 5m, 10m, 15m and 20m according to the surface circle with the current pole as the center of the circle and the radius of 3m, 5m, 10m, 15m and 20m1，ρ2，…ρ20Average of the sum of absolute values of the differences from the average:
Δρtotal mean of＝(|ρ1-ρAverage|+|ρ2-ρAverage|+…+|ρ20-ρAverage|)/20。
4. The method of claim 1, wherein the uncertainty of the inverse short-range measurement of the earth's resistance due to the soil structure near the current pole is approximately α,
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| CN202010345607.9A CN111487468A (en) | 2020-04-27 | 2020-04-27 | Ground network uncertainty measuring method based on resistivity |
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| CN202010345607.9A CN111487468A (en) | 2020-04-27 | 2020-04-27 | Ground network uncertainty measuring method based on resistivity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285456A (en) * | 2020-09-16 | 2021-01-29 | 云南电网有限责任公司昆明供电局 | Potential-based ground grid uncertainty measuring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285456A (en) * | 2020-09-16 | 2021-01-29 | 云南电网有限责任公司昆明供电局 | Potential-based ground grid uncertainty measuring method |
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