CN118091321A - Method and device for detecting corrosion of grounding grid of power transmission line - Google Patents
Method and device for detecting corrosion of grounding grid of power transmission line Download PDFInfo
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- 238000005260 corrosion Methods 0.000 title claims abstract description 43
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- 238000009826 distribution Methods 0.000 claims abstract description 20
- 239000002689 soil Substances 0.000 claims abstract description 19
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- 238000003860 storage Methods 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 description 6
- 238000007689 inspection Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 229910000746 Structural steel Inorganic materials 0.000 description 4
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- 201000004569 Blindness Diseases 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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Abstract
The application discloses a method and a device for detecting corrosion of a grounding network of a power transmission line, which are characterized in that the resistance value of each node is calculated through the effective values of alternating excitation voltage and current of each node of the grounding network, and a digital twin technology is adopted for display; dividing nodes with different resistance values of the grounding network into different subsets according to a graph theory algorithm, and optimizing the strong communication nodes and the sets of double communication nodes, cutting points and bridges to obtain an undirected distribution diagram of the grounding network; the method comprises the steps of (1) giving different weight values to different subset objects in an undirected distribution diagram of a grounding grid by adopting a analytic hierarchy process, quantitatively analyzing, comprehensively considering soil moisture and soil corrosive ion concentration, and decomposing a total target resistance value and resistance values of all nodes into different hierarchical structures; and finally, recursively integrating different hierarchical structures through weighted calculation and a recursion algorithm to obtain the positioning of the severely corroded nodes of the grounding network, so that the change condition of the resistances of all the branches in the grounding network can be accurately known, and the positions of the severely corroded nodes can be obtained.
Description
Technical Field
The application relates to the technical field of corrosion detection of a grounding grid, in particular to a method and a device for detecting corrosion of the grounding grid of a power transmission line.
Background
The integrity and reliability of the grounding grid are important guarantees for the safe operation of the transmission line. The earth network conductors in the country are mostly made of galvanized steel, and are easy to corrode due to soil corrosion and electric force. Meanwhile, hidden troubles such as cold joint, missing welding, material steal and material reduction in domestic ground screen construction can easily cause poor electrical connection between the equalizing conductors of the ground screen, and the performance of the ground screen is affected. At present, the state evaluation method of the grounding grid of the power transmission line mainly comprises a grounding conduction test and excavation inspection. The grounding conduction test result can only reflect the partial overall condition of the grounding network, the change condition of each branch resistance of the grounding network can not be accurately known, and the single-port conduction result can be measured each time, so that the measurement efficiency is low. The excavation inspection is blind, and has the difficulties of large construction work amount, difficult problem discovery, low efficiency, high cost and the like.
Disclosure of Invention
Therefore, the application provides a method and a device for detecting corrosion of a grounding grid of a power transmission line, which are used for solving the problems that the state method of the grounding grid of the power transmission line in the prior art cannot accurately know the change condition of the resistances of all branches of the grounding grid, and has low efficiency and high cost.
In order to achieve the above object, the present application provides the following technical solutions:
in a first aspect, a method for detecting corrosion of a power transmission line grounding grid includes:
step 1: acquiring effective alternating current excitation voltage and current values of all nodes of a grounding network;
step 2: calculating the resistance value of each node of the grounding network according to the alternating current excitation voltage and the current effective value;
Step 3: displaying the resistance value change trend of each node of the grounding network by adopting a digital twin technology;
Step 4: analyzing the resistance value change trend of each node of the grounding network, dividing the nodes with different resistance values of the grounding network into different subsets according to a graph theory algorithm, and optimizing the collection of strong communication nodes and double communication nodes, cutting points and bridges to obtain a grounding network undirected distribution diagram;
Step 5: the method comprises the steps of (1) giving different weight values to different subset objects in the undirected distribution diagram of the grounding grid by adopting a analytic hierarchy process, carrying out quantitative analysis, comprehensively considering soil moisture and soil corrosive ion concentration, and decomposing a total target resistance value and resistance values of all nodes into different hierarchical structures;
step 6: and recursively integrating different hierarchical structures through weighted calculation and a recursion algorithm to obtain the positioning of the severely corroded nodes of the grounding network.
Preferably, in the step 1, the ac excitation voltage of each node of the ground network is obtained through a matrix switch and an ac excitation voltage source.
Preferably, in the step 1, the obtaining the effective current value of each node of the ground network specifically includes: under the high-frequency on-off working condition of the matrix change-over switch, signals are transmitted through the current transformer coils, so that different current signals are coupled on the connecting wires of all nodes of the grounding network, and then the current effective values of all the nodes are measured respectively.
Preferably, in the step 5, the hierarchical structure is a tree structure.
In a second aspect, a corrosion detection device for a ground network of a power transmission line includes:
the voltage and current acquisition module is used for acquiring alternating current excitation voltage and current effective values of all nodes of the grounding network;
the calculation module is used for calculating the resistance value of each node of the grounding network according to the alternating current excitation voltage and the current effective value;
The display module is used for displaying the resistance value change trend of each node of the grounding network by adopting a digital twin technology;
The grounding grid undirected distribution diagram generation module is used for analyzing the resistance value change trend of each node of the grounding grid, dividing the nodes with different resistance values of the grounding grid into different subsets according to a graph theory algorithm, and optimizing the collection of strong communication nodes, double communication nodes, cutting points and bridges to obtain the grounding grid undirected distribution diagram;
the analytic hierarchy process module is used for giving different weight values to different subset objects in the undirected distribution diagram of the grounding grid by adopting the analytic hierarchy process, carrying out quantitative analysis, comprehensively considering soil moisture and soil corrosive ion concentration, and decomposing the total target resistance value and the resistance value of each node into different hierarchical structures;
and the corrosion node positioning module is used for recursively integrating different hierarchical structures through weighted calculation and a recursion algorithm to obtain the positioning of the severe corrosion nodes of the grounding network.
Preferably, the ac excitation voltage of each node of the ground network is obtained through a matrix switch and an ac excitation voltage source.
Preferably, the obtaining the current effective value of each node of the grounding network specifically includes: under the high-frequency on-off working condition of the matrix change-over switch, signals are transmitted through the current transformer coils, so that different current signals are coupled on the connecting wires of all nodes of the grounding network, and then the current effective values of all the nodes are measured respectively.
Preferably, the hierarchical structure is a tree structure.
In a third aspect, a computer device includes a memory and a processor, the memory storing a computer program, the processor implementing steps of a method for detecting corrosion of a power transmission line ground network when executing the computer program.
In a fourth aspect, a computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of a method for corrosion detection of a transmission line ground network.
Compared with the prior art, the application has at least the following beneficial effects:
The application provides a method and a device for detecting corrosion of a grounding grid of a power transmission line, which are characterized in that the resistance value of each node of the grounding grid is calculated through the obtained alternating current excitation voltage and current effective value of each node of the grounding grid, the resistance value variation trend of each node of the grounding grid is displayed through a digital twin technology, the nodes with different resistance values of the grounding grid are divided into different subsets according to a graph theory algorithm, the sets of strong communication nodes, double communication nodes, cutting points and bridges are optimized to obtain a grounding grid undirected distribution diagram, different subset objects in the grounding grid undirected distribution diagram are endowed with different weight values through a hierarchical analysis method, quantitative analysis is carried out, the soil moisture and the soil corrosive ion concentration are comprehensively considered, the total target resistance value and the resistance value of each node are decomposed into different hierarchical structures, and finally the different hierarchical structures are recursively integrated through weighted calculation and a recursion algorithm to obtain the positioning of the serious corrosion nodes of the grounding grid. The method and the device can accurately acquire the change condition of the resistances of all the branches in the grounding network, obtain the position of the severely corroded node, provide an accurate position for excavation and inspection, avoid blindness of excavation and inspection, improve the working efficiency and save the overhaul cost.
Drawings
In order to more intuitively illustrate the prior art and the application, exemplary drawings are presented below. It should be understood that the specific shape and configuration shown in the drawings are not generally considered limiting conditions in carrying out the application; for example, those skilled in the art will be able to make routine adjustments or further optimizations for the addition/subtraction/attribution division, specific shapes, positional relationships, connection modes, dimensional proportion relationships, and the like of certain units (components) based on the technical concepts and the exemplary drawings disclosed in the present application.
Fig. 1 is a flowchart of a method for detecting corrosion of a power transmission line grounding network according to a first embodiment of the present application;
FIG. 2 is a schematic diagram of a current effective value measurement structure according to a first embodiment of the present application;
FIG. 3 is an equivalent circuit diagram of the first embodiment of the present application for measuring the effective value of current;
Fig. 4 is a schematic diagram of a first structure for detecting corrosion of a grounding grid of an angle iron tower according to an embodiment of the present application;
fig. 5 is a schematic diagram of a second structure for detecting corrosion of a grounding grid of an angle iron tower according to a first embodiment of the present application;
Fig. 6 is a schematic diagram of an equivalent multiport pure resistance network for corrosion detection of an angle iron tower grounding network according to an embodiment of the present application.
Detailed Description
The application will be further described in detail by means of specific embodiments with reference to the accompanying drawings.
In the description of the present application: unless otherwise indicated, the meaning of "a plurality" is two or more. The terms "first," "second," "third," and the like in this disclosure are intended to distinguish between the referenced objects without a special meaning in terms of technical connotation (e.g., should not be construed as emphasis on the degree of importance or order, etc.). The expressions "comprising", "including", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).
The terms such as "upper", "lower", "left", "right", "middle", and the like, as used herein, are generally used for the purpose of facilitating an intuitive understanding with reference to the drawings and are not intended to be an absolute limitation of the positional relationship in actual products.
Example 1
Referring to fig. 1, the embodiment provides a method for detecting corrosion of a power transmission line grounding grid, which includes:
s1: acquiring effective alternating current excitation voltage and current values of all nodes of a grounding network;
Specifically, when the full-automatic matrix change-over switch and the ac excitation voltage source are adopted to obtain ac excitation voltages of all nodes of the grounding network (the common grounding network has 16 nodes), the method specifically comprises the following steps: a matrix switch (typically a multi-channel switch, which switches different channels by a control signal) is connected to each node of the ground network, and then connected to an ac excitation voltage source, which injects an ac voltage signal into the ground network, at a suitable frequency and amplitude. The channels of the switches are sequentially switched through the signals of the control matrix switches, the output of the alternating current excitation voltage source is sequentially connected to each node of the grounding network, and after each channel is switched, the alternating current voltage of the corresponding node is measured by using a proper measuring device (such as a voltmeter or a data collector), so that the alternating current excitation voltage of each node can be obtained.
Referring to fig. 2 and 3, the current effective values of the nodes of the grounding network are specifically obtained in this step: under the high-frequency on-off working condition of the matrix change-over switch, signals are transmitted through the current transformer coils, so that different current signals are coupled to 16 node connecting lines on the grounding network, and then the current effective values on all nodes are measured respectively.
The measurement method of the pilot frequency constant current alternating current on-resistance can effectively avoid electromagnetic interference of a power transmission line site, and the switching among 16 measurement channels is performed in a soft switching mode, so that simultaneous measurement of 120 ports is realized, and the detection efficiency is improved by tens of times compared with a single-port measurement mode of a traditional on-resistance tester.
S2: calculating the resistance value of each node of the grounding network according to the effective values of the alternating current excitation voltage and the current;
Specifically, the resistance values of 16 nodes are accurately calculated according to the effective values of the alternating excitation voltage and the current.
S3: displaying the resistance value change trend of each node of the grounding network by adopting a digital twin technology;
specifically, in this step, a mathematical model (the mathematical model may be a regression model or a time sequence analysis model, etc.) is established by using the resistance values of each node, so as to describe the resistance value variation trend of each node of the grounding network; then, the established mathematical model is applied to a digital twin platform, a virtual copy of the grounding grid is created, and in the digital twin platform, the virtual copy can be simulated and monitored in real time; and finally, displaying the resistance value change trend of each node of the grounding network by utilizing the visualization tool provided by the digital twin platform. The change of the node resistance value with time can be shown by a line graph, a graph or the like. The virtual copy of the grounding network is monitored and analyzed in real time through the digital twin platform, whether the node resistance value exceeds a preset range or not can be detected, future trends of the resistance value are predicted, and the like.
S4: analyzing the resistance value change trend of each node of the grounding network, dividing the nodes with different resistance values of the grounding network into different subsets according to a graph theory algorithm, and optimizing the collection of strong communication nodes and double communication nodes, cutting points and bridges to obtain a grounding network undirected distribution diagram;
S5: the method comprises the steps of (1) giving different weight values to different subset objects in an undirected distribution diagram of a grounding grid by adopting a analytic hierarchy process, quantitatively analyzing, comprehensively considering soil moisture and soil corrosive ion concentration, and decomposing a total target resistance value and resistance values of all nodes into different hierarchical structures;
Specifically, the hierarchical structure may be preferably a tree structure, or may be other hierarchical structures.
S6: and recursively integrating different hierarchical structures through weighted calculation and a recursion algorithm to obtain the positioning of the severely corroded nodes of the grounding network.
Specifically, in the step, according to the node weight and the hierarchical structure calculated in the previous step, each node is weighted, and the comprehensive weight of the node is combined with the hierarchical structure where the node is located to obtain the comprehensive weight of the node in the whole system; then starting from the soil moisture and the soil corrosive ion concentration of the bottommost layer by using a recursion algorithm, gradually integrating the nodes rising to a higher layer according to the weights of the nodes and the weights of the nodes at the upper layer until the comprehensive weights of the target resistance values of the topmost layer are obtained; by integrating the comprehensive weights, nodes with serious corrosion problems in the grounding grid can be determined. In general, nodes with higher overall weights may have more serious corrosion problems, so these nodes can be located as potentially severely corroded nodes; and finally marking the positioned severely corroded nodes on a distribution diagram of the grounding grid so as to facilitate actual overhaul and maintenance of engineering personnel.
According to the method for detecting corrosion of the grounding grid of the power transmission line, the grounding grid is equivalent to a multiport pure resistance network according to the drawing of the grounding grid of the power transmission line and the grounding lead of the field actual operation equipment, then the grounding grid main framework, the grounding drainage unit and the mathematical model of the ground framework are built based on the VBA and GDI technologies, the actual grounding grid is converted into circuit parameters such as nodes recognized by a computer, branch resistances and the like, and therefore the change condition of each branch resistance in the grounding grid and the serious corrosion result can be accurately obtained, and the position of the serious corrosion node is obtained. The fixed-point excavation can be carried out according to the position of the severely corroded node during excavation inspection, so that the working efficiency is improved, and the overhaul cost is saved.
Referring to fig. 4, 5 and 6, taking an angle iron tower grounding grid as an example, the same grounding grid is provided with A, B, C, D tower legs, the modeling of a transmission line grounding grid drawing is realized based on the GDI technology, a multiport pure resistance network is equivalently formed, the calculated serious corrosion result is corresponding to the grounding grid drawing, and then different colors are utilized for displaying; for example: the qualified detection is green, and the unqualified detection is red.
Example two
The embodiment provides a transmission line grounding grid corrosion detection device, which comprises:
the voltage and current acquisition module is used for acquiring alternating current excitation voltage and current effective values of all nodes of the grounding network;
the calculation module is used for calculating the resistance value of each node of the grounding network according to the alternating current excitation voltage and the current effective value;
The display module is used for displaying the resistance value change trend of each node of the grounding network by adopting a digital twin technology;
The grounding grid undirected distribution diagram generation module is used for analyzing the resistance value change trend of each node of the grounding grid, dividing the nodes with different resistance values of the grounding grid into different subsets according to a graph theory algorithm, and optimizing the collection of strong communication nodes, double communication nodes, cutting points and bridges to obtain the grounding grid undirected distribution diagram;
the analytic hierarchy process module is used for giving different weight values to different subset objects in the undirected distribution diagram of the grounding grid by adopting the analytic hierarchy process, carrying out quantitative analysis, comprehensively considering soil moisture and soil corrosive ion concentration, and decomposing the total target resistance value and the resistance value of each node into different hierarchical structures;
and the corrosion node positioning module is used for recursively integrating different hierarchical structures through weighted calculation and a recursion algorithm to obtain the positioning of the severe corrosion nodes of the grounding network.
The specific implementation content of each module in the corrosion detection of the power transmission line grounding network can be referred to as the limitation of the corrosion detection method of the power transmission line grounding network, and the description is omitted here.
Example III
The embodiment provides a computer device, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of a method for detecting corrosion of a grounding grid of a power transmission line when executing the computer program.
Example IV
The present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of a transmission line ground grid corrosion detection method.
Any combination of the technical features of the above embodiments may be performed (as long as there is no contradiction between the combination of the technical features), and for brevity of description, all of the possible combinations of the technical features of the above embodiments are not described; these examples, which are not explicitly written, should also be considered as being within the scope of the present description.
Claims (10)
1. The method for detecting the corrosion of the grounding grid of the power transmission line is characterized by comprising the following steps of:
step 1: acquiring effective alternating current excitation voltage and current values of all nodes of a grounding network;
step 2: calculating the resistance value of each node of the grounding network according to the alternating current excitation voltage and the current effective value;
Step 3: displaying the resistance value change trend of each node of the grounding network by adopting a digital twin technology;
Step 4: analyzing the resistance value change trend of each node of the grounding network, dividing the nodes with different resistance values of the grounding network into different subsets according to a graph theory algorithm, and optimizing the collection of strong communication nodes and double communication nodes, cutting points and bridges to obtain a grounding network undirected distribution diagram;
Step 5: the method comprises the steps of (1) giving different weight values to different subset objects in the undirected distribution diagram of the grounding grid by adopting a analytic hierarchy process, carrying out quantitative analysis, comprehensively considering soil moisture and soil corrosive ion concentration, and decomposing a total target resistance value and resistance values of all nodes into different hierarchical structures;
step 6: and recursively integrating different hierarchical structures through weighted calculation and a recursion algorithm to obtain the positioning of the severely corroded nodes of the grounding network.
2. The method for detecting corrosion of a ground network of a power transmission line according to claim 1, wherein the ac excitation voltage of each node of the ground network in step 1 is obtained by a matrix switch and an ac excitation voltage source.
3. The method for detecting corrosion of a power transmission line grounding network according to claim 1, wherein the step 1 is specifically performed when obtaining the effective current value of each node of the grounding network: under the high-frequency on-off working condition of the matrix change-over switch, signals are transmitted through the current transformer coils, so that different current signals are coupled on the connecting wires of all nodes of the grounding network, and then the current effective values of all the nodes are measured respectively.
4. The method for detecting corrosion of a ground network of a power transmission line according to claim 1, wherein in the step 5, the hierarchical structure is a tree structure.
5. The utility model provides a transmission line earth screen corrosion detection device which characterized in that includes:
the voltage and current acquisition module is used for acquiring alternating current excitation voltage and current effective values of all nodes of the grounding network;
the calculation module is used for calculating the resistance value of each node of the grounding network according to the alternating current excitation voltage and the current effective value;
The display module is used for displaying the resistance value change trend of each node of the grounding network by adopting a digital twin technology;
The grounding grid undirected distribution diagram generation module is used for analyzing the resistance value change trend of each node of the grounding grid, dividing the nodes with different resistance values of the grounding grid into different subsets according to a graph theory algorithm, and optimizing the collection of strong communication nodes, double communication nodes, cutting points and bridges to obtain the grounding grid undirected distribution diagram;
the analytic hierarchy process module is used for giving different weight values to different subset objects in the undirected distribution diagram of the grounding grid by adopting the analytic hierarchy process, carrying out quantitative analysis, comprehensively considering soil moisture and soil corrosive ion concentration, and decomposing the total target resistance value and the resistance value of each node into different hierarchical structures;
and the corrosion node positioning module is used for recursively integrating different hierarchical structures through weighted calculation and a recursion algorithm to obtain the positioning of the severe corrosion nodes of the grounding network.
6. The apparatus for detecting corrosion of a power transmission line ground network according to claim 5, wherein the ac excitation voltage of each node of the ground network is obtained by a matrix switch and an ac excitation voltage source.
7. The apparatus for detecting corrosion of a power transmission line grounding grid according to claim 5, wherein the step of obtaining the effective current value of each node of the grounding grid is specifically: under the high-frequency on-off working condition of the matrix change-over switch, signals are transmitted through the current transformer coils, so that different current signals are coupled on the connecting wires of all nodes of the grounding network, and then the current effective values of all the nodes are measured respectively.
8. The transmission line ground network corrosion detection device of claim 5, wherein the hierarchy is a tree structure.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 5 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 5.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118376883A (en) * | 2024-06-21 | 2024-07-23 | 国网江西省电力有限公司电力科学研究院 | Stray current corrosion analysis method and system for transformer substation grounding grid |
| CN118376883B (en) * | 2024-06-21 | 2024-10-18 | 国网江西省电力有限公司电力科学研究院 | Stray current corrosion analysis method and system for transformer substation grounding grid |
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