CN201909814U - Short-range measuring measurement structure for grounded resistor of grounded network - Google Patents
Short-range measuring measurement structure for grounded resistor of grounded network Download PDFInfo
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- CN201909814U CN201909814U CN2010202067412U CN201020206741U CN201909814U CN 201909814 U CN201909814 U CN 201909814U CN 2010202067412 U CN2010202067412 U CN 2010202067412U CN 201020206741 U CN201020206741 U CN 201020206741U CN 201909814 U CN201909814 U CN 201909814U
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Abstract
The utility model discloses a short-range measuring measurement structure for a grounded resistor of a grounded network. The measurement structure comprises a tested grounded network (1), a current electrode (2) is arranged within a range of 1 to 50m from the tested grounded network (1), an auxiliary current electrode (3) is arranged within a range of 15 to 50m from the current electrode (2), two ends of a mobile test power supply are connected with two ends of the tested grounded network (1) and the current electrode (2), as well as two ends of the current electrode (2) and the auxiliary current electrode (3); an ammeter and the mobile test power supply are connected in series with test current flowing through a loop in the test; and the voltage of a test node of a voltmeter and the current electrode (2) are opposite to the voltage of the zero potential point of the ground. By adopting the measurement structure, not only the problems of long line laying distance, large workload, easy generation of interference, etc. of a long line measurement method are solved, but also the technical difficult problem that the accuracy of the conventional short-range measurement method can not meet the practical needs is solved.
Description
Technical field
The utility model relates to a kind of measurement structure of short distance Grounding Resistance Measurement, belongs to the indirect short distance field of measuring technique of stake resistance.
Background technology
In the method for existing Grounding Resistance Measurement, then can be divided into length apart from method and short distance method by electric current utmost point unwrapping wire apart from dividing, its fundamental measurement theory is summarized as follows:
Be illustrated in fig. 2 shown below, when behind call through test power supply between the tested earth mat and the electric current utmost point, then in grounded screen, the electric current utmost point, constitute a closed-loop path between the earth and the lead, thereby will there be current i to flow through in the earth, this electric current will produce voltage and distribute on the face of land, earth potential distribution curve from figure as can be seen, because the existence of the electric current utmost point, make the zero potential surface of infinite distant place be moved to certain position between the earth mat and the electric current utmost point, its accurate location and concrete soil geologic structure and earth mat structural parameters are closely bound up, and therefore how accurately finding this zero-potential point A promptly is the key that can various measuring methods successful.
Long minimum 4～5 times of reaching the earth mat diagonal-size of distance that require the electric current utmost point and tested ground network edge apart from method, and theoretically this distance the longer the better, because the electric current utmost point is far away more, then its earth potential smooth section of falling in the middle of the curve is obvious more, finds earth potential zero point by trial method also just easily more.Existing short distance rule is to be based upon on the basis that computer numerical calculates, and by entities such as grounded screen and soil media are set up numerical value or equivalent model, finds the solution soil distribution of current equation with the position of zero potential point definitely with computer software then.
Long respectively have relative merits apart from method and short distance method, length has realized grounding resistance is measured comparatively accurately apart from method, but because its unwrapping wire is apart from too far away, workload is big, particularly in the area, mountain area, operate extremely difficult, and long measuring lead wire also can increase mushing error, though the influence that measuring methods such as 30 ° of angle-off sets of being derived by it or reverse method can suppress to disturb by technological means to a certain extent, but its heavy operating process is still the problem that the field engineering technician has to face, even if yet there are many drawbacks in length apart from method, because present existing short distance measuring method is ripe not enough technically, therefore up-to-date earth mat detects rules and still recommends to use length apart from method stake resistance to be measured.
The theoretical foundation of existing short distance measuring method all is on the accurate foundation that is based upon earth mat and soil texture model, therefore also has many difficulties technically, mainly contains following 2 points:
1, the short distance method requires over the ground the web frame parameter to carry out accurate modeling.This is very difficult beyond doubt in practice, because be subjected to many factor affecting, web frame mostly has very big difference with construction drawing practically, particularly for some operations earth mat of the remote past, owing to reasons such as corrosion, web frame can great changes will take place on ground, and these all can bring very mistake to the foundation of giving the ground pessimistic concurrency control.
2, the short distance method is taked the equivalent model processing mode to actual soil texture when calculating the surface potential distribution, and promptly bilayer or the multilayer soil texture with equivalence replaces actual soil.This processing mode itself is exactly not rigorous, because so-called " equivalence " is actually at by the entity beyond the equivalent, be illustrated in fig. 3 shown below, after the equivalence of the soil texture of regional A is double-decker, order for the P beyond the regional A, its surface potential can not change, but it is then different for the Q point that is positioned at regional A inside, its surface potential must be inequality before and after equivalence, and all short distance measuring methods have all carried out the soil between the earth mat and the electric current utmost point equivalent process at present, therefore the zero-potential point that is calculated must be positioned at the inside of equivalent soil model, thereby will inevitably cause the error of calculation.
Summary of the invention
The technical problems to be solved in the utility model is: provide that a kind of measuring operation is simple, quick, cost is low, the measured value measurement structure of short distance Grounding Resistance Measurement accurately, can overcome the deficiencies in the prior art.
The measurement structure of short distance Grounding Resistance Measurement, it comprises tested grounded screen, in the 0-50m of tested grounded screen scope, the electric current utmost point is set, in the 15-50m of electric current utmost point scope, the auxiliary current utmost point is set, and the mobile test power supply connects the two ends of the tested grounded screen and the electric current utmost point and the two ends of the electric current utmost point and the auxiliary current utmost point respectively, the test current in loop is flow through in reometer and the test of mobile test power series, and the voltage table test node voltage and the electric current utmost point are with respect to the voltage of the earth zero-potential point.
The catercorner length of the electric current utmost point is smaller or equal to 5m.
The short distance Grounding Resistance Measurement is finished by following step:
A, near tested grounded screen, select smooth landform to arrange the electric current utmost point that is used to measure its stake resistance;
B, artificially regard this electric current utmost point as tested grounded screen, and longly routinely the electric current utmost point is carried out grounding resistance measurement, measure the stake resistance R of the electric current utmost point apart from mensuration
The utmost point
C, between the tested grounded screen and the electric current utmost point, apply trial voltage, measure by the test current between the tested grounded screen and the electric current utmost point, utilize Ohm law to calculate the stake resistance sum R of the tested grounded screen and the electric current utmost point with reometer
Always
D, with R
AlwaysDeduct the stake resistance R of the electric current utmost point
The utmost pointCan obtain the resistance value R of tested grounded screen
Net
Electric current utmost point physical dimension generally is no more than 5m.
The electric current utmost point is arranged on the zone of being convenient to implement measuring operation in the tested grounded screen 50m scope.
When the electric current utmost point that is provided with was carried out grounding resistance measurement, because the extremely physical dimension of this electric current own is arranged in the 5m, its maximum unwrapping wire distance was smaller or equal to 50m.
Compared with the prior art, the utility model with the electric current utmost point as tested small connect ground net, and apart from the requirement of mensuration the electric current utmost point is carried out grounding resistance measurement by long, because of tested electric current utmost point physical dimension generally is set in the 5m, even if so it is carried out grounding resistance measurement by long distance, required maximum unwrapping wire distance also need not surpass 50m can satisfy the measuring accuracy requirement, make and under environment with a varied topography, that unwrapping wire is difficult, be convenient to measuring operation, so just can accurately measure the stake resistance R of the electric current utmost point
The utmost pointSimultaneously for tested grounded screen, between itself and the electric current utmost point, apply under the situation of certain measuring voltage, can accurately measure the test current on the loop, utilize Ohm law just can calculate the stake resistance sum R of the tested earth mat and the electric current utmost point
Always, use R at last
AlwaysDeduct R
The utmost pointJust can draw the grounding resistance R of tested grounded screen
NetAdopt the method not only can avoid tradition length big, easily produce problems such as interference, and can avoid existing short distance measuring method to measure not accurate enough technical matters apart from mensuration unwrapping wire distance, workload.Whole test process does not need extras simultaneously, and is simple to operate, has excellent popularization and applied value.
Technological means of the present utility model is compared with existing mensuration and is also had following characteristics simultaneously
The correctness of final testing result is not subjected to electric current to have the influence of body position.Therefore the electric current utmost point can be arranged near the tested earth mat even in earth mat inside, as long as it does not contact with tested grounded screen.
In measure R
The utmost pointThe time, can adopt conventional length to measure to guarantee result's correctness apart from method.And because the size very little with respect to tested earth mat (being no more than 5m usually) of the electric current utmost point, even therefore the unwrapping wire distance is amplified to 10 times of electric current utmost point diagonal-size, its unwrapping wire distance also only needs about 50m.
Because the particular location of the electric current utmost point does not influence the correctness of measurement result, therefore can according to field condition with its be arranged on that physical features is smooth, geology zone uniformly, be convenient for measuring operation.
Whole test process does not need extras, and is simple to operate.
It is long apart from method of testing to compare tradition, because R
AlwaysWith R
The utmost pointMeasuring process do not need longly apart from unwrapping wire, so this method has realized that indirectly the short distance of stake resistance measures.
Description of drawings
Fig. 1 is a test philosophy synoptic diagram of the present utility model;
The schematic diagram that Fig. 2 measures for Resistance of Grounding Grids;
Fig. 3 produces schematic diagram for the main error of existing short distance measuring method.
Embodiment
As shown in Figure 1, at first principle of the present utility model is made an explanation, when after energized between the tested grounded screen 1 and the electric current utmost point 2, because the existence of the electric current utmost point 2, make the zero potential surface of infinite distant place be moved to certain position between the tested grounded screen 1 and the electric current utmost point 2.This conclusion is undoubtedly strict establishment, and is irrelevant with the distance of the electric current utmost point 2 present positions, as long as the electric current utmost point 2 does not have directly with tested grounded screen 1 and contacts.Measuring current i is flowing to via the earth in the process of the electric current utmost point by grounded screen, and all electric current lines are inevitable all can to pass this zero potential surface.By the definition of stake resistance as can be known, when measuring current i flow to zero potential surface by tested grounded screen, the resistance that it ran into is the stake resistance of tested grounded screen 1, and in like manner when i flow to the electric current utmost point 2 by zero potential surface, the resistance that is run into was the stake resistance of the electric current utmost point 2.Therefore the R that obtains divided by test current with trial voltage
AlwaysBe the stake resistance sum of the tested earth mat and the electric current utmost point, i.e. R
Always=R
Net+ R
The utmost point, this conclusion also is strict the establishment undoubtedly, and is irrelevant with the distance of the electric current utmost point 2.
Under the prerequisite of clear and definite above-mentioned theory, we are earlier to R
AlwaysMeasure, the concrete measurement adopted following steps
A, location arrangements is used for the electric current utmost point 2 of Grounding Resistance Measurement near tested grounded screen 1; The electric current utmost point 2 generally is arranged in the zone that near tested earthing electric network (in the 50m scope) is convenient to implement measuring operation, and the catercorner length of the electric current utmost point 2 is smaller or equal to 5m
B, with the electric current utmost point 2 as tested small connect ground net, and apart from mensuration the auxiliary current utmost point 3 is set, and apart from the requirement of method the electric current utmost point 2 is carried out grounding resistance measurement by long by tradition length, obtain its stake resistance R
The utmost pointLess because of the physical dimension of the electric current utmost point 2, even if measure apart from method by tradition is long, its maximum unwrapping wire distance also need not surpass 50m.When measuring, the mobile test power supply connects tested grounded screen 1 and the two ends of the electric current utmost point 2 and the two ends of the electric current utmost point 2 and the auxiliary current utmost point 3 respectively, reometer and mobile test power series, be used for testing the test current that flows through the loop, voltage table is used for test node voltage and the electric current utmost point 2 voltage with respect to the earth zero-potential point.
C, between the tested grounded screen 1 and the electric current utmost point 2, apply trial voltage, measure test current between the tested grounded screen 1 and the electric current utmost point 2, utilize Ohm law to calculate the stake resistance and the R of tested grounded screen 1 and the electric current utmost point 2 with reometer
Always
D, utilize the stake resistance sum R of tested grounded screen 1 and the electric current utmost point 2
AlwaysDeduct the stake resistance R of the electric current utmost point 2
The utmost pointCan obtain the grounding resistance R of tested grounded screen
Net
Claims (2)
1. the measurement structure of a short distance Grounding Resistance Measurement, it comprises tested grounded screen (1), it is characterized in that: the electric current utmost point (2) is set in the 0-50m scope of tested grounded screen (1), the auxiliary current utmost point (3) is set in the 15-50m scope of the electric current utmost point (2), and the mobile test power supply connects tested grounded screen (1) and the two ends of the electric current utmost point (2) and the two ends of the electric current utmost point (2) and the auxiliary current utmost point (3) respectively, the test current in loop is flow through in reometer and the test of mobile test power series, and the voltage table test node voltage and the electric current utmost point (2) are with respect to the voltage of the earth zero-potential point.
2. the measurement structure of short distance Grounding Resistance Measurement according to claim 1 is characterized in that: the catercorner length of the electric current utmost point (2) is smaller or equal to 5m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010202067412U CN201909814U (en) | 2010-05-28 | 2010-05-28 | Short-range measuring measurement structure for grounded resistor of grounded network |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202067412U CN201909814U (en) | 2010-05-28 | 2010-05-28 | Short-range measuring measurement structure for grounded resistor of grounded network |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825662A (en) * | 2010-05-28 | 2010-09-08 | 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 |
| CN104198820A (en) * | 2014-08-19 | 2014-12-10 | 河海大学 | Ground resistance calculation method of double-layer soil containing massive medium |
| CN104777367A (en) * | 2015-03-23 | 2015-07-15 | 河南师范大学 | Ohmmeter-based grounding resistance measurement method |
| CN107843784A (en) * | 2017-10-27 | 2018-03-27 | 国网陕西省电力公司电力科学研究院 | A kind of large-scale grounding network high frequency characteristics method of testing to be flowed back using earth mat |
-
2010
- 2010-05-28 CN CN2010202067412U patent/CN201909814U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825662A (en) * | 2010-05-28 | 2010-09-08 | 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 |
| 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 |
| CN104198820A (en) * | 2014-08-19 | 2014-12-10 | 河海大学 | Ground resistance calculation method of double-layer soil containing massive medium |
| CN104198820B (en) * | 2014-08-19 | 2017-04-19 | 河海大学 | Ground resistance calculation method of double-layer soil containing massive medium |
| CN104777367A (en) * | 2015-03-23 | 2015-07-15 | 河南师范大学 | Ohmmeter-based grounding resistance measurement method |
| CN104777367B (en) * | 2015-03-23 | 2017-08-25 | 河南师范大学 | A kind of method based on ohmmeter measurement of Grounding Resistance |
| CN107843784A (en) * | 2017-10-27 | 2018-03-27 | 国网陕西省电力公司电力科学研究院 | A kind of large-scale grounding network high frequency characteristics method of testing to be flowed back using earth mat |
| CN107843784B (en) * | 2017-10-27 | 2019-10-11 | 国网陕西省电力公司电力科学研究院 | A method for testing high-frequency characteristics of large-scale grounding grids using grounding grid backflow |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUIZHOU NANYUAN ELECTRIC POWER TECHNOLOGY DEV CO., Free format text: FORMER NAME: GUIZHOU NANYUAN POWER TECHNOLOGY DEVELOPMENT CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 550008 Guizhou city of Guiyang province Jinyang national high tech Industrial Development Zone Science and Technology Industrial Park standard plant 2. Patentee after: GUIZHOU NANYUAN ELECTRIC POWER TECHNOLOGY CO., LTD. Patentee after: Anshun Power Supply Bureau Address before: 550008 No. 2, standard factory building, Jinyang hi tech Industrial Park, Guiyang hi tech Zone, Guizhou Patentee before: Guizhou Nanyuan Power Technology Development Co., Ltd. Patentee before: Anshun Power Supply Bureau |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110727 |
|
| CX01 | Expiry of patent term |