CN109781798B - Pole tower grounding grid corrosion detection method and system - Google Patents
Pole tower grounding grid corrosion detection method and system Download PDFInfo
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Abstract
The invention discloses a method for detecting corrosion of a grounding grid of an electric pole tower, which comprises the following steps: step 1) injecting step current into a grounding grid by adopting an excitation current source; step 2) forming an electrode ring and three electrode points on the grounding network by the four-electrode system; step 3) calculating the simulated equivalent resistance between the three electrode points and the electrode ring by using a finite element analysis method; and 4) generating grounding grid soil corrosion detection data according to the simulated equivalent resistance, and performing filtering processing and parameter analysis to generate a grounding grid corrosion detection result. The method provided by the invention does not need to obtain specific corrosion data, and the obtained change trend of the plurality of grounding grids is obtained according to the difference change of the resistivity, so that the corrosion condition of the grounding grids can be visually judged, and the applicability is strong. In addition, the invention also provides a corrosion detection system for the grounding grid of the pole tower.
Description
Technical Field
The invention relates to the technical field of grounding grid corrosion detection, in particular to a method for detecting the corrosion of a grounding grid of an electric pole tower. It also relates to a detection system.
Background
The transmission line iron tower comprises a ground part and an underground part. The degree of corrosion of the iron tower on the ground can be qualitatively evaluated by visual inspection due to exposure to the atmospheric environment. The underground part is buried underground, so that the underground part cannot be seen and is not provided with a monitoring device, so that the corrosion problem can be exposed after the iron tower of the power transmission line runs for a period of time, and particularly the corrosion problem of the iron tower in coastal areas is particularly prominent. At present, the linear polarization technology is mostly adopted for corrosion detection of the iron tower of the power transmission line, and the detection technology is easily influenced by interference signals, so that the measurement result is influenced.
The chinese patent CN101315403 discloses a method and a system for detecting corrosion of a grounding grid, which discloses a technical scheme for detecting corrosion of the grounding grid of a power plant and a transformer substation under the condition of no excavation. However, the grounding grid corrosion detection scheme mainly for power plants and substations cannot be well applied to the grounding grid detection of power transmission line towers, because the power transmission line towers are often arranged in the field, the grounding grid detection is performed by using the grounding grid detection equipment suitable for the power plants and substations to the field power transmission line towers, which is inconvenient to carry and has signal interference, so that the detection data is inaccurate.
The grounding grid is an important facility for ensuring the safe and stable operation of power equipment and protecting personal safety, and the grounding grid is easily corroded after being buried in soil for a long time. For the corrosion degree of the grounding grid, the corrosion degree can be indirectly judged only by measuring the electrical parameters of the grounding grid, accurate positioning cannot be realized, large-area excavation and inspection must be carried out on a transformer substation, and time and labor are wasted. How to rapidly and accurately diagnose the corrosion state of the grounding grid is a problem which needs to be solved urgently at present.
The existing grounding grid detection needs to detect complex data, is troublesome through a complex calculation process and a complex conversion process, and cannot intuitively reflect the corrosion condition of the grounding grid.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the purposes of the invention is to provide a method for detecting corrosion of an electric pole tower grounding grid, which does not need to obtain specific corrosion data, obtains the change trends of a plurality of grounding grids according to the difference change of resistivity to visually judge the corrosion conditions, has strong applicability and can effectively solve the problems provided by the background technology. The second purpose of the invention is to provide a corrosion detection device for the grounding grid of the pole tower.
One of the purposes of the invention is realized by the following technical scheme:
a corrosion detection method for a pole tower grounding grid comprises the following steps:
step 1: injecting step current to the grounding grid by adopting an excitation current source;
step 2: forming an electrode ring and three electrode points on the grounding net through a four-electrode system;
and step 3: calculating the simulated equivalent resistance between the three electrode points and the electrode ring by using a finite element analysis method;
and 4, step 4: and generating grounding grid soil corrosion detection data according to the simulated equivalent resistance, and performing filtering processing and parameter analysis to generate a grounding grid corrosion detection result.
Particularly, the four-electrode system comprises an electrode ring electrode, a reference electrode and two auxiliary electrodes, wherein the electrode ring electrode is arranged on a steel plate of the grounding grid in a clinging mode, the reference electrode is connected to the electrode ring electrode to form the center of an electrode ring on the steel plate, and the two auxiliary electrodes are also connected and arranged in the electrode ring.
In particular, the four-electrode system is provided with a current restraint circuit in a connection mode, so that the polarization current on the grounding grid is completely restrained in the electrode circular ring.
Particularly, the current constraint circuit comprises a current polarization circuit and a current compensation limiting circuit, wherein the current polarization circuit applies negative polarization current to the electrode circular ring electrode, applies positive polarization current to the reference electrode and the two auxiliary electrodes to enable the steel plate to be in a polarization state, generates polarization potential difference on the steel plate in the electrode circular ring and forms response current, and obtains the simulated equivalent resistance by detecting corresponding current on the steel plate; the current compensation limiting circuit is used for suppressing current leakage of the electrode circular ring.
In particular, the current polarization circuit consists of an operational amplifier U1, an operational amplifier U2 and an operational amplifier U3, the operational amplifier U2 outputs negative polarization current to the electrode ring electrode, and the operational amplifier U3 outputs positive polarization current to the reference electrode and the two auxiliary electrodes; the current compensation limiting circuit is composed of an operational amplifier U2 and an operational amplifier U4, a voltage signal at the output end of the operational amplifier U2 is loaded to the inverting end of the operational amplifier U4, so that the voltage signals output by the operational amplifier U2 and the operational amplifier U4 have the same phase and amplitude, an equipotential output is formed, the current output by the operational amplifier U4 flows to a steel plate on the outer side of the electrode ring, and the leakage current of the electrode ring is suppressed.
In particular, the operational amplifier U1 is an impedance transformer, the operational amplifier U2 and operational amplifier U3 are adders or power amplifiers, and the operational amplifier U4 is a unity gain voltage follower.
Particularly, the device also comprises a data acquisition unit which is used for acquiring the polarization potential difference between the reference electrode, the two auxiliary electrodes and the electrode ring electrode, and taking a plurality of detection points on the electrode ring electrode at equal intervals, thereby acquiring polarization potential difference curves from the reference electrode and the two auxiliary electrodes to the detection points respectively and generating the curves of the simulated polarization resistance values from the reference electrode and the two auxiliary electrodes to the detection points respectively.
Particularly, the excitation current source is controlled by the central computing processing module, and in addition, an external data input module, a data communication storage module, a state output module, a measurement operation module, a voltage measurement module and an analog-to-digital conversion module are further arranged;
the excitation current source is connected with the input end of the current output module, and the output end of the current output module applies step current to the grounding grid through the multi-loop wiring device;
the external data input module and the state output module are connected with the data communication storage module; the communication port of the data communication storage module is connected with the central computing processing module for communication; the input end of the voltage measuring module is connected with the multi-loop wiring device, and the output end of the voltage measuring module is connected with the data input end of the central computing processing module through the analog-to-digital conversion module; and the measurement operation module is connected with the central computing processing module to realize the measurement operation function.
Particularly, the external data input module is formed by connecting an external data input interface and a topological structure conversion module, and the output end of the topological structure conversion module is connected with the data communication storage module; the state output module is formed by connecting a data image conversion module and a corrosion state display interface, and the input end of the data image conversion module is connected with the data communication storage module.
The second purpose of the invention is realized by the following technical scheme:
the corrosion detection system for the grounding grid of the pole tower comprises a central computing processing module, an external data input module, a data communication storage module, a state output module, a central computing processing module, a measuring operation module, a voltage measuring module and an analog-to-digital conversion module;
the external data input module and the state output module are connected with the data communication storage module; the communication port of the data communication storage module is connected with the central computing processing module for communication; the input end of the voltage measuring module is connected with the multi-loop wiring device, and the output end of the voltage measuring module is connected with the data input end of the central computing processing module through the analog-to-digital conversion module; the measurement operation module is connected with the central computing processing module to realize a measurement operation function;
the excitation current source is controlled by the central computing processing module and is connected with the input end of the current output module, and the output end of the current output module applies step current to the grounding grid through the multi-loop wiring device.
The invention has the beneficial effects that: the invention mainly designs a ring electrode, an electrode ring is formed on a steel plate of a grounding grid to be detected, a reference electrode at the central position is arranged in the electrode ring and is used as a comparison group, two auxiliary electrodes at different positions are used as experiment groups, the resistance condition from the reference electrode to a plurality of (countless) electrode points on the electrode ring is calculated by utilizing a finite element analysis method, so that the resistance value of the steel plate in the whole electrode ring is calculated and obtained, the auxiliary electrodes are the same calculation method, after the grounding grid is corroded, the two auxiliary electrodes and one reference electrode have different calculation results, and the corrosion condition of the grounding grid is judged by calculating the difference between the two auxiliary electrodes and the reference electrode; specific corrosion data does not need to be acquired, the acquired change trend of a plurality of grounding grids is acquired according to the difference change of the resistivity, the corrosion condition of the grounding grids is visually judged, and the applicability is strong;
the invention measures the corrosion state of the grounding grid by connecting the excitation power module, the current output module, the multi-loop wiring device, the voltage measuring module and the analog-to-digital conversion module with the central computing processing module, adopts the grounding grid branch impedance two-dimensional imaging technology, quickly and effectively diagnoses the corrosion state of the grounding grid under the condition of no excavation of a transformer substation, and displays the corrosion state in a two-dimensional imaging mode, has quick, accurate and convenient detection, and solves the problem that the corrosion state of the grounding grid is difficult to quickly and accurately diagnose.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof.
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In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of the current-limiting circuit of the present invention;
FIG. 3 is a block diagram of the data detection and processing of the present invention.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
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.
As shown in fig. 1, the invention provides a method for detecting corrosion of a grounding grid of an electric pole tower, which comprises the following steps:
step 1: injecting step current into a grounding grid by adopting a four-electrode system, wherein the four-electrode system comprises an electrode ring electrode, a reference electrode and two auxiliary electrodes, the electrode ring electrode is tightly attached to a steel plate of the grounding grid, the reference electrode is connected to the electrode ring electrode to form the center of an electrode ring on the steel plate, and the two auxiliary electrodes are also connected into the electrode ring;
step 2: the four-electrode system forms an electrode ring and three electrode points on the grounding network;
and step 3: calculating the simulated equivalent resistance between the three electrode points and the electrode ring by using a finite element analysis method;
and 4, step 4: and generating grounding grid soil corrosion detection data according to the simulated equivalent resistance, and performing filtering processing and parameter analysis to generate a grounding grid corrosion detection result.
In this embodiment, an electrode ring is formed on a steel plate of a grounding grid to be tested by designing a ring electrode, a reference electrode at a central position is arranged in the electrode ring and used as a reference group, two auxiliary electrodes at different positions are used as experimental groups, and resistance conditions from the reference electrode to a plurality of electrode points on the electrode ring are calculated by using a finite element analysis method, so that a resistance value of the steel plate in the whole electrode ring is calculated and obtained.
The finite element analysis method has the following specific principle:
1) selecting proper discrete units to carry out unit segmentation on the solution area;
2) numbering the units and the nodes according to a certain sequence respectively;
3) calculating functional on each unit;
4) overlapping the functional on the unit to obtain the functional of the whole area;
5) forming an integral equation set;
6) solving the whole equation set to obtain function values on all nodes;
7) and calculating the function value of any point in the unit according to the function value on the node by using the interpolation formula on the unit.
As shown in fig. 2, the four-electrode system applies a step current to the grounding grid through the current constraint circuit, so as to completely constrain the polarization current in the electrode circular ring; the current restraint circuit comprises a current polarization circuit and a current compensation limiting circuit, the current polarization circuit applies negative polarization current to the electrode circular ring electrode, applies positive polarization current to the reference electrode and the two auxiliary electrodes to enable the steel plate to be in a polarization state, polarization potential difference is generated on the steel plate in the electrode circular ring and response current is formed, and analog equivalent resistance is obtained by detecting corresponding current on the steel plate; the current compensation limiting circuit is used for suppressing current leakage of the electrode circular ring.
The current polarization circuit comprises an operational amplifier U1, an operational amplifier U2 and an operational amplifier U3, wherein the operational amplifier U2 outputs negative polarization current to the electrode ring electrode, and the operational amplifier U3 outputs positive polarization current to the reference electrode and the two auxiliary electrodes; the current compensation limiting circuit is composed of an operational amplifier U2 and an operational amplifier U4, a voltage signal at the output end of the operational amplifier U2 is loaded to the inverting end of the operational amplifier U4, so that the voltage signals output by the operational amplifier U2 and the operational amplifier U4 have the same phase and amplitude, namely, an equipotential output is formed, the current output by the operational amplifier U4 flows to a steel plate on the outer side of the electrode ring, and the leakage current of the electrode ring is suppressed.
The operational amplifier U1 is an impedance transformer, the operational amplifier U2 and the operational amplifier U3 are adders or power amplifiers, and the operational amplifier U4 is a unity gain voltage follower.
The device also comprises a data acquisition unit which is used for acquiring the polarization potential difference between the reference electrode, the two auxiliary electrodes and the electrode ring electrode, and a plurality of detection points are taken at equal intervals on the electrode ring electrode, so that the polarization potential difference curves from the reference electrode and the two auxiliary electrodes to the detection points respectively are acquired, and the curves of the simulated polarization resistance values from the reference electrode and the two auxiliary electrodes to the detection points respectively are generated.
And finally, comparing the difference value of the resistivity reference values measured by the two auxiliary electrodes by taking the reference electrode as a reference to obtain the corrosion data of the grounding grid. Because the resistivity reference values of finite element analysis of each point at the beginning of the grounding grid are approximately the same, the corrosion condition of the grounding grid can be judged more effectively and directly by the method.
The reference electrode is made of saturated copper sulfate, the auxiliary electrode is made of stainless steel, and the electrode ring electrode is made of carbon steel.
According to the method, specific corrosion data do not need to be acquired, the acquired change trend of the grounding grids is acquired according to the difference change of the resistivity, the corrosion condition of the grounding grids is visually judged, and the method is high in applicability.
As shown in fig. 3, the corrosion detection system for the grounding grid of the pole tower of the present invention includes a central computing processing module, an external data input module, a data communication storage module, a status output module, a central computing processing module, a measurement operation module, a voltage measurement module, and an analog-to-digital conversion module;
the external data input module and the state output module are connected with the data communication storage module; the communication port of the data communication storage module is connected with the central computing processing module for communication; the input end of the voltage measuring module is connected with the multi-loop wiring device, and the output end of the voltage measuring module is connected with the data input end of the central computing processing module through the analog-to-digital conversion module; the measurement operation module is connected with the central computing processing module to realize a measurement operation function;
the excitation current source is controlled by the central computing processing module and is connected with the input end of the current output module, and the output end of the current output module applies step current to the grounding grid through the multi-loop wiring device.
The external data input module is formed by connecting an external data input interface and a topological structure conversion module, and the output end of the topological structure conversion module is connected with the data communication storage module; the state output module is formed by connecting a data image conversion module and a corrosion state display interface, and the input end of the data image conversion module is connected with the data communication storage module.
And the topological structure of the grounding grid of the transformer substation to be tested is input in a specified format by using an external input interface, is converted into a data matrix required by calculation by using a topological structure conversion module, and is stored in a data communication storage module.
And testing personnel select a corresponding number of test wires according to the scale of the transformer substation, and respectively connect one end of each test wire to the multi-loop wiring device and connect the other end of each test wire to the grounding downlead of different power grid equipment.
After all the wiring is finished, the tester sets test options through the test operation module and starts the device. In the device, an excitation current source generates excitation current, the excitation current is output through a current output module, a measurement signal is extracted by a voltage measurement module after the excitation current flows through a grounding grid measurement loop, and finally, measurement data is generated through a digital-to-analog conversion module and is transmitted to a central computing processing module.
The central computing processing module carries out computing processing on the measured data by calling the topological structure data matrix and feeds back the computing structure to the data communication storage module. And finally, generating a two-dimensional image through a data image conversion module, and displaying a two-dimensional image result on a corrosion state display interface.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (2)
1. A corrosion detection method for a pole tower grounding grid is characterized by comprising the following steps: the method comprises the following steps:
step 1: injecting step current to the grounding grid by adopting an excitation current source;
step 2: forming an electrode ring and three electrode points on the grounding net through a four-electrode system; the four-electrode system comprises an electrode ring electrode, a reference electrode and two auxiliary electrodes, wherein the electrode ring electrode is arranged on a steel plate of a grounding grid in a clinging mode, the reference electrode is connected to the electrode ring electrode to form the center of an electrode ring on the steel plate, and the two auxiliary electrodes are also connected and arranged in the electrode ring; the four-electrode system is connected with a current restraint circuit, so that the polarization current on the grounding grid is completely restrained in the electrode circular ring; the current restraint circuit comprises a current polarization circuit and a current compensation limiting circuit, wherein the current polarization circuit applies negative polarization current to the electrode circular ring electrode, applies positive polarization current to the reference electrode and the two auxiliary electrodes to enable the steel plate to be in a polarization state, generates polarization potential difference on the steel plate in the electrode circular ring and forms response current, and obtains simulated equivalent resistance by detecting the response current on the steel plate; the current compensation limiting circuit is used for suppressing current leakage of the electrode circular ring;
the device also comprises a data acquisition unit, a data acquisition unit and a data processing unit, wherein the data acquisition unit is used for acquiring the polarization potential difference between the reference electrode, the two auxiliary electrodes and the electrode ring electrode, and a plurality of detection points are acquired at equal intervals on the electrode ring electrode, so that polarization potential difference curves from the reference electrode and the two auxiliary electrodes to the detection points respectively are acquired, and curves of simulated polarization resistance values from the reference electrode and the two auxiliary electrodes to the detection points respectively are generated;
and step 3: calculating the simulated equivalent resistance between the three electrode points and the electrode ring by using a finite element analysis method;
and 4, step 4: generating grounding grid soil corrosion detection data according to the simulated equivalent resistance, and performing filtering processing and parameter analysis to generate a grounding grid corrosion detection result;
the excitation current source is controlled by the central computing processing module, and in addition, an external data input module, a data communication storage module, a state output module, a measurement operation module, a voltage measurement module and an analog-to-digital conversion module are also arranged;
the excitation current source is connected with the input end of the current output module, and the output end of the current output module applies step current to the grounding grid through the multi-loop wiring device;
the external data input module and the state output module are connected with the data communication storage module; the communication port of the data communication storage module is connected with the central computing processing module for communication; the input end of the voltage measuring module is connected with the multi-loop wiring device, and the output end of the voltage measuring module is connected with the data input end of the central computing processing module through the analog-to-digital conversion module; the measurement operation module is connected with the central computing processing module to realize a measurement operation function;
the external data input module is formed by connecting an external data input interface and a topological structure conversion module, and the output end of the topological structure conversion module is connected with the data communication storage module; the state output module is formed by connecting a data image conversion module and a corrosion state display interface, and the input end of the data image conversion module is connected with the data communication storage module;
the current polarization circuit consists of an operational amplifier U1, an operational amplifier U2 and an operational amplifier U3, wherein the operational amplifier U2 outputs negative polarization current to the electrode ring electrode, and the operational amplifier U3 outputs positive polarization current to the reference electrode and the two auxiliary electrodes; the current compensation limiting circuit is composed of an operational amplifier U2 and an operational amplifier U4, a voltage signal at the output end of the operational amplifier U2 is loaded to the inverting end of the operational amplifier U4, so that the voltage signals output by the operational amplifier U2 and the operational amplifier U4 have the same phase and amplitude, an equipotential output is formed, the current output by the operational amplifier U4 flows to a steel plate on the outer side of the electrode ring, and the leakage current of the electrode ring is suppressed.
2. The method for detecting corrosion of the grounding grid of the electric pole tower as recited in claim 1, wherein: the operational amplifier U1 is an impedance transformer, the operational amplifier U2 and the operational amplifier U3 are adders or power amplifiers, and the operational amplifier U4 is a unity gain voltage follower.
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| CN115656027B (en) * | 2022-11-01 | 2023-06-13 | 哈尔滨工业大学 | Multifunctional wireless node for electrochemical monitoring of corrosion of steel-concrete structure |
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