CN109580463B - Method for measuring corrosion degree of grounding grid - Google Patents
Method for measuring corrosion degree of grounding grid Download PDFInfo
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- CN109580463B CN109580463B CN201811397171.7A CN201811397171A CN109580463B CN 109580463 B CN109580463 B CN 109580463B CN 201811397171 A CN201811397171 A CN 201811397171A CN 109580463 B CN109580463 B CN 109580463B
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- 230000007797 corrosion Effects 0.000 title claims abstract description 32
- 238000005260 corrosion Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009614 chemical analysis method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
Abstract
The invention relates to a method for measuring the corrosion degree of a grounding grid, which comprises the following steps: determining each node of a grounding grid; secondly, a node is selected randomly, and the equivalent resistance between the node and any one of other nodes except the node is measured; selecting a next node, and measuring the equivalent resistance between the node and any one of other nodes except the node and the selected node; fourthly, repeating the step three until the equivalent resistance between the node which is the last but one and the node which is the last is measured; fifthly, measuring the equivalent resistance, storing all the equivalent resistances obtained through measurement, and calculating the resistance value between two adjacent nodes according to the composition of the equivalent resistances; sixthly, forming a corresponding relation between the obtained resistance value and the actually detected corrosion degree and establishing a curve. According to the invention, the corrosion degree of the grounding grid can be monitored on line through certain calculation, so that a large amount of manpower and material resources can be saved.
Description
Technical Field
The invention belongs to the technical field of detection of corrosion degree of a grounding grid, and particularly relates to a method for measuring corrosion degree of the grounding grid.
Background
The grounding grid is used as an important component for discharging fault current and lightning current, plays a very critical role in the safe operation of a power system, and the size of the resistance of the grounding grid determines the capacity of the grounding system for discharging the fault current. When the resistance of the grounding grid is increased due to corrosion, the insulation of the equipment can be broken down, the monitoring or control equipment is mistakenly operated or refused to operate if the resistance is increased, and the equipment is damaged if the resistance is increased, so that the accident is enlarged. In addition, flat steel or galvanized steel is generally adopted as a grounding grid material of a transformer substation in China at the present stage, and is buried underground all the year round, so that corrosion is more likely to occur due to a plurality of reasons such as chemical corrosion, electrochemical corrosion and microbial corrosion, and the like, and the safe operation of a power grid is potentially threatened, so that the judgment and monitoring of the corrosion degree of the grounding grid are particularly important. Considering that the grounding net is buried in a soil layer with a few meters underground, if the grounding net is completely taken out and observed by naked eyes or analyzed by other chemical analysis methods for analyzing the corrosion degree, the labor is large, and the corrosion is accelerated to some extent when the grounding net is exposed to air.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for measuring the corrosion degree of a grounding grid, which is used for monitoring and qualitatively analyzing the corrosion degree of the grounding grid on the premise of maintaining the normal operation of the power grid and not excavating a soil layer.
The invention adopts the following specific technical scheme:
a method for measuring the corrosion degree of a grounding grid is characterized by comprising the following steps: the method comprises the following steps:
determining each node of a grounding grid;
secondly, a node is selected randomly, and the equivalent resistance between the node and any one of other nodes except the node is measured;
selecting a next node, and measuring the equivalent resistance between the node and any one of other nodes except the node and the selected node;
fourthly, repeating the step three until the equivalent resistance between the node which is the last but one and the node which is the last is measured;
fifthly, measuring the equivalent resistance, storing all the equivalent resistances obtained through measurement, and calculating the resistance value between two adjacent nodes according to the composition of the equivalent resistances;
sixthly, forming a corresponding relation between the obtained resistance value and the actually detected corrosion degree and establishing a curve.
The invention has the advantages and beneficial effects that:
in the invention, a node is selected, the equivalent resistance between the node and other nodes is measured, after the measured nodes are discharged, the nearest next node is sequentially selected, the equivalent resistance between the node and the rest other nodes is continuously measured, finally, the resistance value between two adjacent nodes is calculated according to all the equivalent resistances, and then the resistance value and the actually detected corrosion degree form a corresponding relation and a curve. The invention can monitor and analyze the corrosion degree of the grounding grid on the premise of maintaining the normal operation of the power grid and not excavating the soil layer, and judges the corrosion degree of the grounding grid on line so as to formulate a corresponding correction and modification scheme. In the process, only the resistance among different nodes needs to be measured, the corrosion degree of the grounding grid can be monitored on line through certain calculation, and a large amount of manpower and material resources can be saved.
Drawings
FIG. 1 is a mesh of nodes of the present invention;
fig. 2 is an equivalent circuit diagram of fig. 1 when a is taken as the first node measurement.
Detailed Description
The present invention is further described in the following examples, but the technical content described in the examples is illustrative and not restrictive, and the scope of the present invention should not be limited thereby.
The invention discloses a method for measuring the corrosion degree of a grounding grid, which is characterized in that as shown in figures 1 and 2: the method comprises the following steps:
determining each node of a grounding grid;
secondly, a node is selected randomly, and the equivalent resistance between the node and any one of other nodes except the node is measured;
selecting a next node, and measuring the equivalent resistance between the node and any one of other nodes except the node and the selected node;
fourthly, repeating the step three until the equivalent resistance between the node which is the last but one and the node which is the last is measured;
fifthly, measuring the equivalent resistance, storing all the equivalent resistances obtained through measurement, and calculating the resistance value between two adjacent nodes according to the composition of the equivalent resistances;
sixthly, forming a corresponding relation between the obtained resistance value and the actually detected corrosion degree and establishing a curve.
Examples
The ground grid is shown in fig. 1, and has nodes A, B, C, D, E, F, which are connected to ground equipment and exposed above ground.
Firstly, selecting AB to measure, and then the equivalent circuit diagram is shown in FIG. 2, and similarly, continuing to measure the equivalent resistances of AC, AD, AE, AF, BC, BD, BE, BF, CD, CE, CF, DE, DF and EF, and obtaining another 14 equivalent circuit diagrams. The equivalent resistances of the 15 equivalent circuit diagrams are all composed of 7 resistances from R1 to R7, and the 7 resistance values can be calculated according to the equation of the 15 equivalent resistances. And detecting the degree of corrosion degree between every two nodes on the spot, forming a corresponding relation with the resistance value to fit a curve, and subsequently judging the degree of corrosion degree of each line of the grounding grid according to the obtained resistance value.
In the invention, a node is selected, the equivalent resistance between the node and other nodes is measured, after the measured nodes are discharged, the nearest next node is sequentially selected, the equivalent resistance between the node and the rest other nodes is continuously measured, finally, the resistance value between two adjacent nodes is calculated according to all the equivalent resistances, and then the resistance value and the actually detected corrosion degree form a corresponding relation and a curve. The invention can monitor and analyze the corrosion degree of the grounding grid on the premise of maintaining the normal operation of the power grid and not excavating the soil layer, and judges the corrosion degree of the grounding grid on line so as to formulate a corresponding correction and modification scheme. In the process, only the resistance among different nodes needs to be measured, the corrosion degree of the grounding grid can be monitored on line through certain calculation, and a large amount of manpower and material resources can be saved.
Claims (1)
1. A method for measuring the corrosion degree of a grounding grid is characterized by comprising the following steps: the method comprises the following steps:
determining each node of a grounding grid;
secondly, a node is selected randomly, and the equivalent resistance between the node and any one of other nodes except the node is measured;
selecting a next node, and measuring the equivalent resistance between the node and any one of other nodes except the node and the selected node;
fourthly, repeating the step three until the equivalent resistance between the node which is the last but one and the node which is the last is measured;
fifthly, measuring the equivalent resistance, storing all the equivalent resistances obtained through measurement, and calculating the resistance value between two adjacent nodes according to the composition of the equivalent resistances;
sixthly, forming a corresponding relation between the obtained resistance value and the actually detected corrosion degree and establishing a curve.
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| CN201811397171.7A CN109580463B (en) | 2018-11-22 | 2018-11-22 | Method for measuring corrosion degree of grounding grid |
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| CN201811397171.7A CN109580463B (en) | 2018-11-22 | 2018-11-22 | Method for measuring corrosion degree of grounding grid |
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| CN109580463B true CN109580463B (en) | 2021-08-20 |
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| CN110333393B (en) * | 2019-07-05 | 2021-07-23 | 中铁第四勘察设计院集团有限公司 | Traction substation grounding grid data monitoring system and method |
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