CN111487184A - Experimental platform for simulating stray current leakage and corrosion of subway train - Google Patents
Experimental platform for simulating stray current leakage and corrosion of subway train Download PDFInfo
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- G—PHYSICS
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- 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
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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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
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G06F2113/00—Details relating to the application field
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Abstract
The invention discloses an experimental platform for simulating stray current leakage and corrosion of a subway train, which consists of a bearing with a seat, a plastic rod, a sliding block, a screw rod, a stepping motor, a first lead wire, a P L C controller, a motor driver, a programmable direct-current power supply, a second lead wire, a first graphite electrode, a second graphite electrode, a steel pipe test piece, a glass container and a simulated soil solution.
Description
Technical Field
The invention relates to the field of stray current leakage and corrosion of trains, in particular to an experimental platform for simulating stray current leakage and corrosion of subway trains.
Background
With the continuous development of large and medium-sized cities, the construction of urban rail transit mainly based on subways becomes an effective means for relieving urban traffic pressure, improving the level of public transport service, improving urban image and promoting economic development. At present, the subway in China mainly adopts a DC750V or DC1500V direct current traction power supply system, a traction substation provides traction current for a subway train, and the traction current passes through the train and finally returns to the traction substation along a track (namely a running track). Since the track cannot be completely insulated from ground, current inevitably leaks from the running rails to the ground, resulting in stray currents. The long-term stray current leakage can cause serious electrochemical corrosion to buried metals along the subway line, so that huge economic loss is caused, and huge hidden dangers are brought to safe trip of passengers.
The change rule of the traction current under the actual operation condition of the subway has great influence on the leakage of the stray current. The traction current of the subway train is continuously changed along with the train operation conditions (acceleration, uniform speed and braking) in the operation process, the traction current of the train is up to 3000A in the acceleration and braking stages, the traction current is only dozens of amperes in the uniform speed stage, and the size of the traction current has a direct relation with the leakage of stray current, so that the stray current model fully considers the distribution influence of the actual traction operation conditions of the train on the stray current. In addition, the corrosion of stray current to buried metals is electrochemical in nature. The speed of the metal electrochemical corrosion is determined by the size of the current flowing through the metal, the anode reaction can occur when the current flows out of the buried metal, and the corrosion quality of the metal can be calculated through the electron number conversion of the anode reaction metal loss. Due to the complexity of the practical subway interval, no experimental method and model for uniformly and reliably simulating stray current leakage and corrosion evaluation calculation under the subway operation condition exist at home and abroad at present. At present, patents such as CN103088344B, CN101358827A, CN209368357U and the like can not solve the problem. Therefore, the experimental platform for the quantitative calculation of the stray current leakage and the corrosion under the condition of completely simulating the train operation working condition is designed, the experimental platform has very important practical significance, on one hand, an experimental method can be provided for scientific research, in addition, theoretical support and technical guidance can be provided for subway stray current prevention and treatment, and the quantitative calculation and the health assessment of metal corrosion can be realized through a finite element method.
Disclosure of Invention
In order to solve the problems, the invention aims to provide an experimental platform for simulating stray current leakage and corrosion of a subway train, which is established to simulate a quantitative calculation experimental platform for stray current leakage and corrosion under the condition of train operation conditions, analyze the corrosion condition of buried metal under the action of subway dynamic stray current through finite element software simulation, and calculate and predict the corrosion of the buried metal by adopting a finite element numerical method.
In order to achieve the purpose, the experimental platform for simulating the stray current leakage and corrosion of the subway train is realized as follows:
a test platform for simulating stray current leakage and corrosion of a subway train comprises a ground bearing with a seat, a plastic rod, a sliding block, a lead screw, a stepping motor, a first lead, a P L C controller, a motor driver, a programmable direct current power supply, a second lead, a first graphite electrode, a second graphite electrode, a steel pipe test piece, a glass container and a simulated soil solution, wherein the ground bearing, the plastic rod, the sliding block, the lead screw, the stepping motor, a first lead, a P L C controller and the motor driver form a simulated train motion unit, the lead screw is connected between the ground bearing with the seat and the stepping motor, the sliding block is installed on the lead screw, the plastic rod is fixed below the sliding block, the first lead respectively connects the motor driver with the stepping motor and the P L C controller, the P L C controller controls the motor driver to work, the stepping motor drives the lead screw to rotate, the stepping motor drives the sliding block to drive the sliding block to move on the lead screw, the sliding block to move along with the sliding block, the sliding block is driven to move in a subway transmission mode, the sliding block is simulated train to simulate running, the running of the subway train, the ground, the simulated by the power supply, the graphite simulation of the graphite rod, the graphite unit, the graphite rod is simulated by the graphite rod, the graphite rod simulation test platform, the graphite rod is simulated by a graphite rod, the graphite rod is simulated track, the graphite rod is simulated by a simulated system, the graphite rod is simulated by a simulated system simulated track, the graphite rod is simulated by a simulated track, the graphite rod simulated system simulated by a simulated system simulated track, the graphite rod simulated system simulated track, the graphite rod simulated track, the simulated by a simulated track, the graphite rod simulated by a simulated track, the simulated system simulated by.
The stray current loop unit simulates a typical subway bilateral return circuit, wherein the second graphite electrode simulates leakage points of the stray current of a subway train, the two same first graphite electrodes simulate two return points of the stray current of the subway train, a group of leakage current data which change along with time is arranged in the programmable direct current power supply and then is applied to the second graphite electrode, and the subway train stray current loop can be simulated.
The P L C controller sends a pulse signal to the motor driver, the motor driver converts the pulse signal into an angular displacement signal and transmits the angular displacement signal to the stepping motor, so that the rotating speed of the stepping motor is controlled, and the P L C controller also controls the steering of the stepping motor, so that the sliding block moves back and forth on the screw rod, and the effect of simulating the dynamic running of the subway train is achieved.
The steel pipe test piece is horizontally fixed in the glass container, and in the process that the leakage current of the simulated subway train, which is applied to the second graphite electrode by the programmable direct current power supply, flows into the simulated soil solution and then flows into the first graphite electrode, part of the current flows through the steel pipe test piece to generate electrolytic corrosion on the steel pipe test piece, so that the corrosion of the leakage current of the subway train on the buried pipeline is simulated.
The invention adds corresponding boundary conditions on finite element analysis software, which comprises a power supply input terminal, two same grounding terminals, an insulation boundary, a soil environment and a reaction electrode, wherein the current set on the power supply input terminal is the same as the current applied to a second graphite electrode by a programmable direct current power supply, the grounding terminal reflects a first graphite electrode, the insulation boundary is equivalent to a glass container, the performance parameters of the reaction electrode phase and a steel pipe test piece are consistent, and the parameters of the soil environment are additives in a simulated soil solution.
The potential V between two identical ground terminals of the invention is 0, and the current on the power input terminal is I0It is shown that n.J is 0 in the insulation boundary parameter setting, wherein n represents a unit normal vector, J represents a current density of the soil environment, conductivity of the soil environment is represented by a letter sigma, a potential field appears in the soil environment due to continuous current flowing into the soil environment from the power input terminal, and potential distribution is represented by Laplace's equation
Controlling the distribution of the electric field intensity E in the soil environment by a formula
It follows that the current density in the soil environment complies with the ohm's law equation J ═ σ E, consisting of
The current density and the potential distribution of each place in the simulated soil environment can be obtained by three formulas of J to sigma E.
The reaction electrode of the invention is divided into a cathode and an anode correspondingly due to the inflow and outflow of current, the metal electrolysis reaction in the anode area loses electrons and is corroded, the reaction electrode is in a balanced state when no current flows on the reaction electrode, and the balanced potential is represented by a letter EeqIndicating that the potential of the reaction electrode deviates from flat when the current passes through the reaction electrodeThe phenomenon of equilibrium is called polarization, and the electrode overpotential is represented by formula (1):
η＝φs-φl-Eeq(1)
wherein phi issRepresents the electrode potential and phi l represents the solution potential;
according to the linear electrode kinetics equation:
the local current density J of the reaction electrode can be obtainedloc,Fe，J0,FeIndicating the exchange current density of the reaction electrode αaAnd αcRespectively representing the anode charge transfer coefficient and the anode charge transfer coefficient of the reaction electrode; r represents a general gas constant, and F is a Faraday constant.
The corrosion rate of the anode metal of the pipeline test piece can be obtained through Faraday's law:
MFerepresents the average molar mass of iron, and n represents the number of electrons lost by the reaction of iron;
according to the constraint equation and the boundary condition formed by the formulas (1), (2) and (3), the corrosion of the buried pipeline test piece can be quantitatively calculated through a three-dimensional finite element model.
The invention sets a three-dimensional finite element model in finite element analysis software to calculate and predict the corrosion of the buried metal, wherein the mesh division method selects a free tetrahedral mesh.
Because the invention builds the leakage corrosion test platform for simulating the dynamic stray current of the subway and adopts the structure of carrying out simulation calculation by the finite element simulation model, the following beneficial effects can be obtained:
1. the method can realize corrosion positioning and quantitative calculation under the action of the stray current of the buried pipeline, further realize the corrosion degree prediction and safety evaluation of the buried pipeline, and provide theoretical technical support for the stray current prevention and control work of enterprises such as subways, oil and gas companies, tap water companies and the like.
2. The invention adopts a seat bearing, a plastic rod, a sliding block, a screw rod, a stepping motor, a first lead, a P L C controller and a motor driver to form a simulated train moving unit to simulate the running condition of a subway train, and realizes the simulation of stray current leakage and corrosion under the dynamic condition of the subway train.
Drawings
FIG. 1 is a schematic overall structure diagram of an experimental platform for simulating stray current leakage and corrosion of a subway train according to the present invention;
FIG. 2 is a schematic diagram of a three-dimensional finite element modeling of an experimental platform for simulating stray current leakage and corrosion of a subway train according to the present invention;
FIG. 3 is a schematic diagram of finite element meshing of an experimental platform for simulating stray current leakage and corrosion of a subway train according to the present invention;
fig. 4 is a current density distribution diagram in a simulated soil environment at a certain time of the experimental platform for simulating stray current leakage and corrosion of the subway train.
The main elements are indicated by symbols.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings.
Fig. 1 to 4 show an experimental platform for simulating stray current leakage and corrosion of a subway train according to the present invention, which includes a pedestal bearing 1, a plastic rod 2, a slider 3, a lead screw 4, a stepping motor 5, a first lead 6, a P L C controller 7, a motor driver 8, a programmable dc power supply 9, a second lead 10, a first graphite electrode 11, a second graphite electrode 12, a steel pipe test piece 13, a glass container 14, and a simulated soil solution 15.
As shown in figure 1, a seat bearing, a plastic rod 2, a sliding block 3, a screw rod 4, a stepping motor 5, a first lead 6, a P L C controller 7 and a motor driver 8 form a simulated train motion unit, the screw rod 4 is connected between the seat bearing 1 and the stepping motor 5, the sliding block 3 is installed on the screw rod 4, the plastic rod 2 is fixed below the sliding block 3, the first lead 6 connects the motor driver 8 with the stepping motor 5 and the P L C controller 7 respectively, the P L C controller 7 controls the motor driver 8 to work, the stepping motor 5 is controlled to rotate by the motor driver 8, the stepping motor 5 drives the screw rod 4 to rotate, the plastic rod 2 moves on the screw rod 4, the sliding block 3 is driven to move in a transmission mode of the screw rod 4, a subway train running simulation test piece is achieved, the programmable direct current power supply 9, a second lead 10, a first graphite electrode 11 and a second graphite electrode 12 form a test piece, the test piece 9, the second lead 10, the first graphite electrode 11 and the second graphite electrode 12 form a test piece 12, the simulated ground corrosion simulation test piece for simulating a ground corrosion unit, the ground corrosion of a ground corrosion simulation system, the ground corrosion of a ground metal corrosion system, the ground corrosion system is realized by a ground corrosion system, the ground corrosion system is realized by the ground corrosion system, the ground corrosion system is realized by a ground corrosion system, the ground corrosion system is realized by the ground corrosion system, the ground corrosion.
The programmable DC power supply 9 adopts a constant HCP-1022 programmable DC power supply.
The stepping motor 5 is a 57-type stepping motor 5.
The stray current loop unit simulates a typical subway bilateral return circuit, wherein the second graphite electrode 12 simulates a leakage point of the stray current of a subway train, the two same first graphite electrodes 11 simulate two return points of the stray current of the subway train, a group of leakage current data which change along with time is set in the programmable direct current power supply 9 and then applied to the second graphite electrode 12, and the subway train stray current loop can be simulated.
The first graphite electrode 11 and the second graphite electrode 12 both use graphite electrodes with a diameter of 10 mm and a length of 100 mm.
The P L C controller 7 sends a pulse signal to the motor driver 8, the motor driver 8 converts the pulse signal into an angular displacement signal, and transmits the angular displacement signal to the stepping motor 5, so that the rotating speed of the stepping motor 5 is controlled, and the P L C controller 7 also controls the steering of the stepping motor 5, so that the sliding block 3 moves back and forth on the screw rod 4, and the effect of simulating the dynamic running of the subway train is achieved.
The steel pipe test piece 13 is horizontally fixed in the glass container 14, and in the process that the leakage current of the simulated subway train, which is applied to the second graphite electrode 12 by the programmable direct current power supply 9, flows into the simulated soil solution 15 and then flows into the first graphite electrode 11, part of the current flows through the steel pipe test piece 13 to generate electrolytic corrosion on the steel pipe test piece 13, so that the corrosion of the leakage current of the subway train on the buried pipeline is simulated.
The steel pipe test piece 13 is a Q235 steel pipe test piece 13 with the length of 500 mm, the outer diameter of 20 mm and the wall thickness of 2 mm.
The glass container 14 is 1000 mm long, 400 mm wide and 500 mm high.
The simulated soil solution 15 adopts clear water and Na2SO4NaCl and NaHCO3And the like, and water.
As shown in fig. 2, the boundary conditions added to the finite element analysis software include a power input terminal 16, two identical ground terminals 17, an insulating boundary 18, a soil environment 19, and a reaction electrode 20, wherein the current set on the power input terminal 16 is the same as the current applied to the second graphite electrode 12 by the programmable dc power supply 9, the ground terminal 17 reflects the first graphite electrode 11, the insulating boundary 18 corresponds to the glass container 14, the reaction electrode 20 is consistent with the performance parameters of the steel pipe test piece 13, and the parameters of the soil environment 19 are additives in the simulated soil solution 15.
The finite element analysis software is COMSO L software.
The potential V between two identical ground terminals 17 of the invention is 0, the current at the power input terminal 16 is represented by I0, the insulation boundary 18 parameter set at n · J ═ 0, where n represents the unit normal vector, J represents the current density of the soil environment 19, the conductivity of the soil environment 19 is represented by the letter σ, and as a result of the continuous current flow from the power input terminal 16 to the soil environment 19, a potential field occurs in the soil environment 19, the potential distribution being represented by the laplace equation
Controlling the distribution of the electric field intensity E in the soil environment 19 according to a formula
It follows that the current density in the soil environment 19 complies with the ohm's law equation J ═ σ E
The current density and potential distribution at various locations in simulated soil environment 19 can be determined by three formulas, J ═ σ E.
The reaction electrode 20 of the present invention is divided into corresponding parts by the inflow and outflow of currentCathode and anode, the metal in the anode area is corroded by losing electrons in electrolytic reaction, and is in a balanced state when no current flows on the reaction electrode 20, and the balanced potential is represented by letter EeqIt is shown that when a current is passed through the reaction electrode 20, the phenomenon that the potential of the reaction electrode 20 deviates from the equilibrium potential is called polarization, and the electrode overpotential is represented by the formula (1):
η＝φs-φl-Eeq(1)
wherein phi issRepresents the electrode potential, [ phi ]lRepresents the solution potential;
according to the linear electrode kinetics equation:
the local current density J of the reaction electrode 20 can be obtainedloc,Fe，J0,FeIndicating the exchange current density of the reaction electrode 20, αaAnd αcRespectively represent the anode charge transfer coefficient and the anode charge transfer coefficient of the reaction electrode 20; r represents a general gas constant, and F is a Faraday constant.
The corrosion rate of the anode metal of the pipeline test piece can be obtained through Faraday's law:
MFerepresents the average molar mass of iron, and n represents the number of electrons lost by the reaction of iron;
according to the constraint equation and the boundary condition formed by the formulas (1), (2) and (3), the corrosion of the buried pipeline test piece can be quantitatively calculated through a three-dimensional finite element model.
As shown in FIG. 3, the present invention calculates and predicts buried metal corrosion by placing a three-dimensional finite element model in the finite element analysis software, wherein the meshing method selects a free tetrahedral mesh.
As shown in fig. 4, in the current density distribution diagram in the simulated soil environment 19 at a certain time when the finite element analysis software calculates the corrosion of the buried metal by using the finite element numerical method, the current flowing from the power input terminal 16 enters the soil environment 19, anode regions are formed at both ends of the reaction electrode 20, a cathode region is formed in the middle of the reaction electrode 20, and the metal in the anode region is corroded due to electron loss through the electrolytic reaction.
The working principle and the working process of the invention are as follows:
the P L C controller 7 controls the motor driver 8 to work, the motor driver 8 controls the stepper motor 5 to rotate, the stepper motor 5 drives the screw rod 4 to rotate, the slide block 3 is further driven to move on the screw rod 4, the plastic rod 2 moves along with the slide block 3, namely, the slide block 3 is driven to move in a transmission mode of the screw rod 4, the subway train is simulated to run on the track, the second graphite electrode 12 moves along with the plastic rod 2, a loop is formed between the first graphite electrode 11 and the second graphite electrode 12, the simulated subway train leakage current applied to the second graphite electrode 12 by the programmable direct current power supply 9 flows into the simulated soil solution 15 and then flows into the first graphite electrode 11, part of the current flows through the steel pipe test piece 13, electrolytic corrosion is generated on the steel pipe test piece 13, namely, the experiment of leakage and corrosion of the subway train is completed, boundary conditions corresponding to the experiment are added to finite element analysis software, and the finite element analysis software adopts a numerical method to calculate and predict the corrosion of the buried metal.
Claims (5)
1. A test platform for simulating stray current leakage and corrosion of a subway train is characterized by comprising a pedestal bearing, a plastic rod, a sliding block, a screw rod, a stepping motor, a first lead, a P L C controller, a motor driver, a programmable direct current power supply, a second lead, a first graphite electrode, a second graphite electrode, a steel pipe test piece, a glass container and a simulated soil solution, wherein the pedestal bearing, the plastic rod, the sliding block, the screw rod, the stepping motor, a first lead, a P L C controller and the motor driver form a simulated train motion unit, the screw rod is connected between the pedestal bearing and the stepping motor, the sliding block is installed on the screw rod, the plastic rod is fixed below the sliding block, the first lead connects the motor driver with the stepping motor and the P L C controller respectively, the P L C controller controls the motor driver to work, the stepping motor driver is controlled by the motor driver to rotate, the stepping motor drives the screw rod to rotate, the test piece drives the sliding block to move on the screw rod, the sliding block to move along with the sliding block, the sliding block is driven to move in a transmission mode, the sliding block is simulated by the sliding block, the subway train, the simulation power supply, the running of the simulated, the simulated subway train is simulated by a finite element, the second graphite power supply, the simulated by a simulated graphite leakage simulation system, the graphite electrode, the graphite leakage simulation test platform, the graphite solution, the graphite electrode is simulated by a simulated ground, the graphite electrode is simulated train simulated by a simulated system, the graphite electrode simulation test piece is simulated system simulated track, the graphite electrode simulation test piece is simulated by a simulated system simulated train simulated system simulated by a simulated system simulated ground, the graphite electrode simulated system simulated by a simulated system simulated ground, the simulated system simulated by a simulated system simulated ground.
2. The experimental platform for simulating stray current leakage and corrosion of the subway train as claimed in claim 1, wherein: the stray current loop unit simulates a typical subway bilateral return circuit, wherein the second graphite electrode simulates a leakage point of the stray current of a subway train, the two same first graphite electrodes simulate two return points of the stray current of the subway train, and a group of leakage current data which change along with time is set in the programmable direct current power supply and then applied to the second graphite electrode, so that the subway train stray current loop can be simulated.
3. The experimental platform for simulating stray current leakage and corrosion of the subway train as claimed in claim 1, wherein: the steel pipe test piece is horizontally fixed in the glass container, and in the process that the programmable direct current power supply is applied to the second graphite electrode and simulates subway train leakage current to flow into a simulated soil solution and then flow into the first graphite electrode, part of current flows through the steel pipe test piece to generate electrolytic corrosion on the steel pipe test piece, so that the corrosion of the subway train leakage current on a buried pipeline is simulated.
4. The experimental platform for simulating stray current leakage and corrosion of the subway train as claimed in claim 1, wherein: the method is characterized in that corresponding boundary conditions are added to finite element analysis software and comprise a power supply input terminal, two identical ground terminals, an insulating boundary, a soil environment and a reaction electrode, wherein the current set on the power supply input terminal is identical to the current applied to a second graphite electrode by a programmable direct current power supply, the ground terminal reflects the first graphite electrode, the insulating boundary is equivalent to a glass container, the performance parameters of the reaction electrode phase and a steel pipe test piece are consistent, and the parameters of the soil environment are additives in a simulated soil solution.
5. The experimental platform for simulating stray current leakage and corrosion of the subway train as claimed in claim 4, wherein: the potential V between the two identical ground terminals is 0, the current on the power input terminal is represented by I0, n.J =0 in the insulation boundary parameter setting, wherein n represents a unit normal vector, J represents the current density of the soil environment, the conductivity of the soil environment is represented by the letter sigma, and a potential field appears in the soil environment due to the continuous current flow from the power input terminal to the soil environmentPotential distribution is represented by the Laplace equation
Controlling the distribution of the electric field intensity E in the soil environment by a formula
Results in which the current density in the soil environment obeys the ohm's law equation
From
、
、
The reaction electrode of the present invention is divided into cathode and anode due to the current flowing in and out, the metal in the anode area is corroded by losing electrons in the electrolytic reaction, and is in a balanced state when no current flows on the reaction electrode, and the balanced potential is in a letter
It is shown that, when a current is passed through the reaction electrode, the phenomenon in which the potential of the reaction electrode deviates from the equilibrium potential is called polarization, and the electrode overpotential is represented by formula (1):
wherein the content of the first and second substances,
which represents the potential of the electrodes and,
represents the solution potential;
according to the linear electrode kinetics equation:
can obtain the local current density of the reaction electrode
，
Represents the exchange current density of the reaction electrode;
and
respectively representing the anode charge transfer coefficient and the anode charge transfer coefficient of the reaction electrode; and R represents a common gas constant, F is a Faraday constant, and the corrosion rate of the anode metal of the pipeline test piece can be obtained through the Faraday law:
according to the constraint equation and the boundary condition formed by the formulas (1), (2) and (3), the corrosion of the buried pipeline test piece can be quantitatively calculated through a three-dimensional finite element model.
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| CN113378436A (en) * | 2021-06-10 | 2021-09-10 | 贵州电网有限责任公司 | Subway stray current leakage and distribution characteristic simulation method based on ANSYS |
| CN114624532A (en) * | 2022-03-14 | 2022-06-14 | 华东交通大学 | Stray current corrosion resistant power grid detection device |
| CN115308118A (en) * | 2022-07-13 | 2022-11-08 | 北京市燃气集团有限责任公司 | Method and device for evaluating metal corrosion inhibition efficiency of interface double-electric-layer capacitor |
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| CN112287589B (en) * | 2020-11-10 | 2022-08-16 | 厦门华润燃气有限公司 | Finite element positioning method for buried steel pipeline anticorrosive coating damage point |
| CN113378436A (en) * | 2021-06-10 | 2021-09-10 | 贵州电网有限责任公司 | Subway stray current leakage and distribution characteristic simulation method based on ANSYS |
| CN113378436B (en) * | 2021-06-10 | 2023-05-05 | 贵州电网有限责任公司 | Metro stray current leakage and distribution characteristic simulation method based on ANSYS |
| CN114624532A (en) * | 2022-03-14 | 2022-06-14 | 华东交通大学 | Stray current corrosion resistant power grid detection device |
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