CN102298093A - Method for measuring ground resistance of ground net - Google Patents
Method for measuring ground resistance of ground net Download PDFInfo
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- CN102298093A CN102298093A CN2011101341599A CN201110134159A CN102298093A CN 102298093 A CN102298093 A CN 102298093A CN 2011101341599 A CN2011101341599 A CN 2011101341599A CN 201110134159 A CN201110134159 A CN 201110134159A CN 102298093 A CN102298093 A CN 102298093A
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Abstract
The invention, which belongs to the measuring method of ground resistance of ground nets of a power plant and a transformer station, discloses a method for measuring ground resistance of a ground net. The method comprises the following steps that: an actual design grounding net is manufactured into a ground net scale model according to scales like a simulate scale; a model conducting medium is prepared according to a soil resistivity or a water conductivity by geological exploration of an installation site of a ground net; on the basis of an electric field geometric simulation theory of a Laplace equation, a length of the ground net of a power plant or a power distribution station can be amplified or reduced in an equal proportion at the beginning of the design on the program of the power plant or the power distribution station. According to the invention, improvement measures are provided for a design on a ground network and foreseeability can be provided for ground resistance after the installation of the ground network; moreover, the design can be optimized on the condition that the performance of the ground resistance is ensured, so that a risk on project cost is further reduced; and explanation on measurement cost enables economy of a ground resistance technology for ground net measurement to be realize. The method provided in the invention can be directly applied to various electric power places and has a wide application range.
Description
Technical field
The present invention relates to the measuring method of Resistance of Grounding Grids, a kind of method of measuring the stake resistance of grounded screen of saying so more specifically.
Background technology
What the Resistance of Grounding Grids measuring method of generating plant of the prior art or transformer station generally adopted is after the on-the-spot installation of grounded screen is finished, measure again, this measuring method does not have foresight for the grounding resistance of grounded screen, and also there is blindness at the improvement of follow-up grounded screen, as the application for a patent for invention publication No. is CN101900764A, denomination of invention is for using the method for short distance measuring method Grounding Resistance Measurement, in its background technology, set forth, most power departments adopt ground resistance measurement methods and require electric current utmost point wire length be transformer station's length 4-5 doubly, as being the large hydropower station grounded screen of nearly 10km for length, after measuring, rectify and improve, and a large amount of uses of ground lead have increased the whole cost of project as undesirable needs.On the other hand; when designing in earlier stage, grounded screen also can adopt some grounded screen simulation softwares to carry out numerical Analysis; this class software carries out analytical calculation based on the theory to electromagnetic field; the conductance of calculation condition setting earthing material, contact resistance, soil resistivity, water etc. is virtual theory state; because the common environment more complicated of grounded screen of generating plant, transformer station; contingency is more; software emulation can only carry out simple Utopian layering; and can not accurately react the stake resistance reality of grounded screen, result of calculation can only be as theoretical reference.
Summary of the invention
The objective of the invention is to solve above-mentioned deficiency, a kind of method that is primarily aimed at the stake resistance of big power station, distribution substation measurement grounded screen is provided.
For solving above-mentioned technical matters, the present invention by the following technical solutions:
A kind of method of measuring the stake resistance of grounded screen provided by the present invention, operate according to following steps:
Step 1, actual design grounded screen is made the grounded screen scale model according to simulation than equal proportion;
Step 2, according to the grounded screen erecting stage survey soil resistivity or water conductivity preparation model conducting medium;
Step 3, according to the grounded screen erecting stage the actual conditions surveyed, fill the conducting medium of corresponding with it different conductances in the relevant position of scale model;
Step 4, scale model is connected the stake resistance of concrete measurement scale model with measuring equipment.
Further technical scheme is: the simulation in the middle of the described step 1 is than selecting to determine according to the actual conditions of surveying on-the-spotly.
Further technical scheme is: the simulation ratio in the middle of the described step 1 is 1: 200～1000.
Further technical scheme is: described step 2 also needs scale model is put into the simulation pond after having disposed the model conducting medium, and then carries out the operation of step 3.
Further technical scheme is: the measuring equipment that adopts in the middle of the described step 4 is power supply, reometer and voltage table, will draw its electric current and voltage after the scale model energising, and then draws the stake resistance of scale model.
Further technical scheme is: the method for making of scale model is in the middle of the described step 1: it is a grounded screen system that the single piece of metal electrode of grounded screen ingredient is welded to connect by soldering, the grounded screen system is for dwindling according to the simulation ratio of actual measurement grounded screen, and the purpose that adopts the soldering welding is reliability and the high conductivity that guarantees the metal electrode tie point.
Further technical scheme is: in the middle of the described step 2 with acetylene carbon black as conducting medium.
Further technical scheme is: in the described step 3 at the relevant position of scale model filled conductive medium, be in scale model, fill with the grounded screen erecting stage the corresponding position of the actual conditions filled conductive medium surveyed, the resistance value of scale model is equaled or near the grounded screen erecting stage the resistance value the surveyed value of dwindling according to special ratios.
Compared with prior art, the invention has the beneficial effects as follows: according to the electric field geometric modelling theory of Laplace's equation, but at the beginning of the design of generating plant or distribution substation project just with the amplification of the length equal proportion of its grounded screen or dwindle, for the design of grounded screen provides innovative approach, stake resistance after the grounded screen installation had foresight, and can be optimized design in the situation that satisfies the stake resistance performance, further reduce the project cost risk, and it is lower to measure cost, realized measuring the economy of the stake resistance technology of grounded screen, and the present invention can directly apply to various electric power place, applied range.
Description of drawings
Fig. 1 is the scale model electric test loop diagram in the specific embodiment of the invention.
Embodiment
The present invention is further elaborated below in conjunction with accompanying drawing.
A kind of method of measuring the stake resistance of grounded screen provided by the present invention, operate according to following steps:
Step 1, actual design grounded screen is made the grounded screen scale model according to simulation than equal proportion, wherein simulation is than selecting to determine according to actual conditions of surveying and data on-the-spotly, the proportioning that adopts in the present embodiment is 1: 200, wherein the method for making of scale model is: it is a grounded screen system that the single piece of metal electrode of grounded screen ingredient is welded to connect by soldering, the grounded screen system is for dwindling according to the simulation ratio of actual measurement grounded screen, and the purpose that adopts the soldering welding is reliability and the high conductivity that guarantees the metal electrode tie point;
Step 2, according to the grounded screen erecting stage survey soil resistivity or water conductivity preparation model conducting medium, conducting medium preferably adopts acetylene carbon black;
Step 3, scale model is put into the simulation pond, the simulation pond be according to the model area of the concrete condition of measure field making, is used for carrying and placing the scale model that step 1 is made;
Step 4, according to the grounded screen erecting stage the actual conditions surveyed, fill the conducting medium of corresponding with it different conductances in the relevant position of scale model, its purpose be make the resistance of scale model be the grounded screen erecting stage the actual conditions resistance geometric ratio surveyed dwindle, and at the relevant position of scale model filled conductive medium, be in scale model, fill with the grounded screen erecting stage the corresponding position of the actual conditions filled conductive medium surveyed, the resistance value of scale model is equaled or near the grounded screen erecting stage the resistance value the surveyed value of dwindling according to special ratios, the preferential acetylene carbon black that adopts in the selection of conducting medium, acetylene carbon black is that manufacture gas decomposes the refining acetylene of purity more than 99% that obtains, the carbon black that obtains behind continuous pyrolysis during by calcium carbide route or naphtha (raw gasoline) pyrolysis.With reacting furnace inside be warming up to acetylene decompose initial temperature more than 800 ℃ after, import acetylene and begin to carry out thermal decomposition.Because of being themopositive reaction, reaction can be carried out automatically.In order to obtain stabilized quality, temperature of reaction should remain on about 1800 ℃.Temperature can be controlled by reacting furnace urceolus water-cooling jacket in the stove.Acetylene carbon black uses with manganese dioxide and electrolytic solution as the anode material of manganese dry cell.It compares its crystallization and secondary structure with furnace black more flourishing, so electric conductivity and absorbency are also better.Because impurity such as heavy metal are few, so the loss that self discharge causes is little, shelf characteric is also better;
Step 5, scale model is connected with measuring equipment, the stake resistance of concrete measurement scale model, measuring equipment preferably adopts power supply, reometer and voltage table, will draw its electric current and voltage after the scale model energising, and then draw the stake resistance of scale model.
As shown in Figure 1, a kind of method of measuring the stake resistance of grounded screen of the present invention, after scale model is made, scale model in the simulation pond is inserted power supply, series current table on the link circuit of power supply and scale model, the voltage table scale model that inserts in parallel by measuring the enforcement electric current and the resistance of scale model, calculates resistance by the R=U/I formula.
Theoretical foundation of the present invention is the geometric model of electric field, is about to original electric field and is proportionally amplified on how much and dwindle.The theoretical foundation of electric field geometric modelling is a Laplace's equation, because Laplace's equation is satisfied in the distribution of current field, its computing formula is:
X ', the y ', the z ' that set analog coordinate have following relationship with x, y, the z of actual coordinate:
x＝ax′、y＝ay′、z＝az′
And the earth mat current potential V of the earth mat current potential of model and reality has following relationship:
V＝BV′
According to above formula, can get:
Abbreviation can get:
By above formula simulate electric field and actual electric field will be identical, so when carrying out simulation test, can actual ground-electrode is scaled.
Claims (8)
1. method of measuring the stake resistance of grounded screen, it is characterized in that: described method can be operated according to following steps:
Step 1, actual design grounded screen is made the grounded screen scale model according to simulation than equal proportion;
Step 2, according to the grounded screen erecting stage survey soil resistivity or water conductivity preparation model conducting medium;
Step 3, according to the grounded screen erecting stage the actual conditions surveyed, fill the conducting medium of corresponding with it different conductances in the relevant position of scale model;
Step 4, scale model is connected the stake resistance of concrete measurement scale model with measuring equipment.
2. the method for the stake resistance of measurement grounded screen according to claim 1 is characterized in that: the simulation in the middle of the described step 1 is than selecting to determine according to the actual conditions of surveying on-the-spotly.
3. the method for the stake resistance of measurement grounded screen according to claim 1 is characterized in that: the simulation ratio in the middle of the described step 1 is 1: 200～1000.
4. the method for the stake resistance of measurement grounded screen according to claim 1 is characterized in that: described step 2 also needs scale model is put into the simulation pond after having disposed the model conducting medium, and then carries out the operation of step 3.
5. the method for the stake resistance of measurement grounded screen according to claim 1, it is characterized in that: the measuring equipment that adopts in the middle of the described step 4 is power supply, reometer and voltage table, to draw its electric current and voltage after the scale model energising, and then draw the stake resistance of scale model.
6. the method for the stake resistance of measurement grounded screen according to claim 1, it is characterized in that: the method for making of scale model is in the middle of the described step 1: it is a grounded screen system that the single piece of metal electrode of grounded screen ingredient is welded to connect by soldering, the grounded screen system is for dwindling according to the simulation ratio of actual measurement grounded screen, and the purpose that adopts the soldering welding is reliability and the high conductivity that guarantees the metal electrode tie point.
7. the method for the stake resistance of measurement grounded screen according to claim 1 is characterized in that: in the middle of the described step 2 with acetylene carbon black as conducting medium.
8. according to the method for the stake resistance of claim 1 or 7 described measurement grounded screens, it is characterized in that: in the described step 3 at the relevant position of scale model filled conductive medium, be in scale model, fill with the grounded screen erecting stage the corresponding position of the actual conditions filled conductive medium surveyed, the resistance value of scale model is equaled or near the grounded screen erecting stage the resistance value the surveyed value of dwindling according to special ratios.
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| CN2011101341599A CN102298093A (en) | 2011-05-24 | 2011-05-24 | Method for measuring ground resistance of ground net |
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| CN2011101341599A CN102298093A (en) | 2011-05-24 | 2011-05-24 | Method for measuring ground resistance of ground net |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104181399A (en) * | 2014-09-17 | 2014-12-03 | 重庆市防雷中心 | Ground resistance testing device and method for structures or buildings in water |
| CN104198820A (en) * | 2014-08-19 | 2014-12-10 | 河海大学 | Ground resistance calculation method of double-layer soil containing massive medium |
| CN111025024A (en) * | 2019-12-20 | 2020-04-17 | 三峡大学 | Method and device for measuring grounding impedance of transformer substation grounding grid based on actual measurement and simulation |
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2011
- 2011-05-24 CN CN2011101341599A patent/CN102298093A/en active Pending
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| KR100918516B1 (en) * | 2009-01-13 | 2009-09-24 | 조승기 | Method for measuring earth resistance of a ground in a manhole |
| CN101900765A (en) * | 2009-05-26 | 2010-12-01 | 上海市电力公司 | Method for building equivalent grounding network computation model |
| CN101900764A (en) * | 2009-05-26 | 2010-12-01 | 上海市电力公司 | Method for measuring grounded resistance of grounded screen by short range measuring method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104181399A (en) * | 2014-09-17 | 2014-12-03 | 重庆市防雷中心 | Ground resistance testing device and method for structures or buildings in water |
| CN104181399B (en) * | 2014-09-17 | 2016-10-05 | 重庆市防雷中心 | Structures or building earth resistance device and method in water |
| CN111025024A (en) * | 2019-12-20 | 2020-04-17 | 三峡大学 | Method and device for measuring grounding impedance of transformer substation grounding grid based on actual measurement and simulation |
| CN111025024B (en) * | 2019-12-20 | 2021-09-28 | 三峡大学 | Method and device for measuring grounding impedance of transformer substation grounding grid based on actual measurement and simulation |
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Application publication date: 20111228 |