CN111289429A - Test platform and test method for researching electrochemical corrosion influence in medium - Google Patents
Test platform and test method for researching electrochemical corrosion influence in medium Download PDFInfo
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- CN111289429A CN111289429A CN202010152975.1A CN202010152975A CN111289429A CN 111289429 A CN111289429 A CN 111289429A CN 202010152975 A CN202010152975 A CN 202010152975A CN 111289429 A CN111289429 A CN 111289429A
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- 238000012360 testing method Methods 0.000 title claims abstract description 105
- 238000006056 electrooxidation reaction Methods 0.000 title claims abstract description 33
- 238000010998 test method Methods 0.000 title claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000005507 spraying Methods 0.000 claims abstract description 11
- 239000002689 soil Substances 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims 1
- 229920000647 polyepoxide Polymers 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 9
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—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
Abstract
The application relates to a test platform and a test method for researching electrochemical corrosion influence in media, wherein the test platform comprises a power supply assembly, a circuit control assembly and a test assembly, the test assembly comprises a plurality of containers for containing test articles and a medium sprayer for spraying conductive liquid, the medium sprayer is arranged at the top of the container, the circuit control assembly comprises a plurality of current-adjustable circuits in one-to-one correspondence with the containers, the power supply assembly comprises a power supply and any current-adjustable circuit, and two ends of the current-adjustable circuits respectively communicate with the power supply and the corresponding test articles in the containers. The test platform for researching the influence of electrochemical corrosion in the medium can set the conductive media with different water contents and conductivities, the alternating currents with different sizes and frequencies and the direct currents with different sizes and polarities according to the test requirements, and can reduce various real environments of the test to the maximum extent. The test platform is intuitive and effective in data acquisition, and the test efficiency is greatly improved.
Description
Technical Field
The application belongs to the technical field of high-voltage tests of industrial equipment, and particularly relates to a test platform and a test method for researching electrochemical corrosion influence in a medium.
Background
Because projects in energy industries such as electric power industry and petroleum industry are often crossed, buried oil and gas pipelines and power transmission lines often share a corridor, the influence of power transmission and transformation projects on the buried oil and gas pipelines is inevitably caused, and the influence of long-term electrochemical corrosion of the buried oil and gas pipelines by the ground current in the power transmission and transformation projects is one of the most main influences. In order to know how short-term or long-term influence on buried oil and gas pipelines is caused by the ground current of power transmission and transformation projects in different media such as soil, water and the like, the electrochemical corrosion simulation test in the media needs to be carried out on hidden project facility slices such as the buried oil and gas pipelines and the like. At present, electrochemical corrosion simulation test equipment in most laboratories has a simple structure, only different soil resistivity soils are considered in tests, other factors are not subjected to test analysis or are not comprehensively analyzed, electrochemical corrosion characteristics of different currents in different media cannot be reduced as much as possible, and therefore test results are often inaccurate and comprehensive.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the test platform and the test method for researching the electrochemical corrosion influence in the medium in various real environments of the test are reduced to the maximum extent so as to overcome the defects that most of laboratories in the prior art have simple structures of electrochemical corrosion simulation test equipment, only different soil resistivity soils are considered in the test, and other factors are not subjected to test analysis.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a test platform for researching electrochemical corrosion influence in media comprises a power supply assembly, a circuit control assembly and a test assembly, wherein the test assembly comprises a plurality of containers for containing test articles and a medium sprayer for spraying conductive liquid, the medium sprayer is arranged at the top of each container, the circuit control assembly comprises a plurality of adjustable current circuits in one-to-one correspondence with the containers, the power supply assembly comprises a power supply, and two ends of each adjustable current circuit are respectively electrically communicated with the power supply and the corresponding test articles in the containers.
In one embodiment, the container is a cuboid with a pair of metal plates on the side faces and insulation material on the other side face, one side of the metal plate is grounded, and the other side of the metal plate is connected with the adjustable current circuit.
In one embodiment, the insulating material is an epoxy.
In one embodiment, each container is provided with a medium sprayer, a plurality of medium sprayers are used for introducing the conductive liquid through a plurality of corresponding guide pipes, a plurality of guide pipes are used for introducing the conductive liquid through a total water pipe, and only one of the guide pipes is provided with an air hole.
In one embodiment, the adjustable current-saving circuit comprises a switch, an adjustable resistor and a current detector which are connected in series with each other.
In one embodiment, the adjustable current-saving circuit further comprises a rectifying device circuit connected in series in the circuit, and a positive-polarity rectifying branch, a negative-polarity rectifying branch and a short-circuit branch which are connected in parallel with each other are arranged in the rectifying device circuit.
In one embodiment, the power supply assembly includes a power switch, the switch, and the current detector being remotely controlled.
In one embodiment, the power supply assembly is formed by connecting a frequency doubling power supply and a power frequency power supply in parallel.
In one embodiment, when there are at least two containers, different containers contain soils with different soil resistivity and/or are sprayed with conductive liquids with different water content and conductivity.
A test platform test method for researching electrochemical corrosion influence in media comprises a power supply assembly, a circuit control assembly and a test assembly, wherein the test assembly comprises a plurality of containers for containing test articles and a medium sprayer for spraying conductive liquid, the medium sprayer is arranged at the top of each container, the circuit control assembly comprises a plurality of adjustable current circuits in one-to-one correspondence with the containers, the power supply assembly comprises a power supply, and two ends of any adjustable current circuit are respectively and electrically communicated with the power supply and the corresponding test articles in the containers, and the test method comprises the following steps:
step 20, spraying conductive liquid through the medium sprayer to adjust the water content and the conductivity of the medium;
step 30, adjusting the current passing through the test sample by adjusting the current of the adjustable current-saving circuit;
and step 40, performing a test under different test conditions of the medium and current combination.
The invention has the beneficial effects that: the test platform and the test method for researching the influence of electrochemical corrosion in the medium can conveniently fix a test article on the platform, and simultaneously, the platform can be provided with conductive media with different water contents and conductivities, alternating currents with different sizes and frequencies and direct currents with different sizes and polarities according to the test requirements, so that various real environments of the test can be reduced to the maximum extent. The test platform is simple to operate, convenient and reliable, data acquisition is visual and effective, the efficiency of the test is greatly improved, and the test platform is high in popularization.
Drawings
The technical solution of the present application is further explained below with reference to the drawings and the embodiments.
FIG. 1 is a schematic structural diagram of an experimental platform for investigating the effect of electrochemical corrosion in a medium according to an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the scope of the present application. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 1, a test platform for investigating the electrochemical corrosion effect in a medium includes a power module, a circuit control module and a test module, wherein the three modules may be sequentially disposed on a platform or separated from each other and then connected through a circuit. The test component, the circuit control component and the power supply component can be respectively positioned in a human-set sample area, a circuit control area and a power supply area. The testing assembly comprises a plurality of containers 1 for accommodating the test articles and a medium sprayer 2 for spraying conductive liquid, wherein the medium sprayer 2 is arranged on the top of the containers 1. The circuit control assembly comprises a plurality of adjustable current circuits which are in one-to-one correspondence with the containers 1 and are used as control branches. The power supply assembly comprises a power supply 3, and two ends of any adjustable current circuit are respectively and electrically communicated with the power supply 3 and a corresponding test article in the container 1.
The invention principle is as follows: the invention relates to a test platform for researching electrochemical corrosion influence in a medium, which utilizes an insulating container to simulate a medium environment, then applies alternating currents with different sizes and frequencies and direct currents with different sizes and polarities in the medium environment, and carries out test simulation of electrochemical corrosion on various types of currents passing through buried metal pipeline slices in a real medium environment.
In one embodiment, the container 1 is an insulating container in which a pair of side surfaces are metal plates 4, and the remaining surfaces are rectangular parallelepipeds (or cubes) of an insulating material as a main body. One side metal plate 4 of the container 1 is grounded, and the other side metal plate 4 is connected with an adjustable current circuit. The metal plates on both sides of each container 1 are present as circuit electrodes.
In one embodiment, the insulating material is an epoxy.
In one embodiment, one medium sprayer 2 is arranged on each container 1, the medium sprayers 2 being arranged uniformly with respect to each other. The medium sprayers 2 are introduced into the conductive liquid through corresponding conduits, and the conduits are introduced into the conductive liquid through a main water pipe 5, and the main water pipe 5 can be supplied with the conductive liquid with certain conductivity configured in advance. In order to ensure the uniform spraying state of the medium in each container 1, the medium sprayer 2 is provided with a guide pipe opening suspended above the container 1, and the rest guide pipes only guide the flow and are not provided with the opening, namely, only one guide pipe in the existing plurality of guide pipes is provided with an air hole.
In one embodiment, the adjustable current circuit comprises a switch, an adjustable resistor 6 and a current detector 7 connected in series with each other. By adjusting the size of the adjustable resistor 6, the total current of each adjustable current circuit can be controlled. The adjustment here is very flexible, such as: each container 1 in the fake equipment test area uses the same medium, and if test currents of large, medium and small three levels are desired to be distinguished, only the adjustable resistor 6 needs to be adjusted; in the false equipment test sample area, media with different conductivities are used for each container 1, and if the influence of the conductivity of the media on the electrochemical corrosion is expected to be researched by using test currents with the same magnitude, only the adjustable resistor 6 needs to be adjusted. The current monitor 7 is used for monitoring the current of the adjustable current circuit corresponding to each container 1 in the sample preparation area in real time.
In one embodiment, the adjustable current circuit further comprises a rectifier circuit 8 connected in series in the circuit, i.e. the rectifier circuit 8 is connected in series with the switch, the adjustable resistor 6 and the current detector 7. Three branches are arranged in the rectifying device circuit 8 and comprise a positive polarity rectifying branch, a negative polarity rectifying branch and a short circuit branch which are connected in parallel. The alternating current can be subjected to positive polarity current, negative polarity current or non-rectification as required, and is used for researching the influence of direct current under different current polarities on electrochemical corrosion in a medium.
In one embodiment, the power supply assembly comprises a power switch, the switch and the current detector 7 are controlled by a remote end, and a protection cut-off function is provided in a secondary loop, so that a tester cannot operate nearby, and the electric shock hazard is avoided.
In one embodiment, the power supply assembly is composed of a frequency doubling power supply and a power frequency power supply which are connected in parallel. The frequency doubling power supply and the power frequency power supply are used for providing alternating current test currents with different frequencies and researching the influence of the test currents with different frequencies on electrochemical corrosion in a medium. Due to the series connection of the rectifier circuit, the test current with different rectification waveforms (sawtooth waves, rectangular waves and the like) can be rectified according to requirements.
The number of containers 1 of the test assembly depends on the laboratory specifications, and in one embodiment the test assembly comprises 3 or 5 containers 1 arranged side by side (or in parallel). After each sample (e.g. buried pipeline) is placed inside the insulated container, 3 or 5 conducting media with different water content and conductivity, such as: the soil with 3 or 5 different soil resistivities or the conductive liquid with 3 or 5 different conductivities can be placed, the water content and the conductivity of each medium can be controlled by selecting the type of the medium, and the water content and the conductivity can also be manually adjusted by a medium sprayer. Due to the multiple control means of the power supply area, the test sample area and the circuit control area, the combination of multiple test working conditions of the electrochemical corrosion influence test in the medium can be met, and according to calculation, if the test sample area is provided with 3 containers 1, the test platform can simulate the research of up to 18 different test working conditions.
In one embodiment, when there are at least two containers 1, different containers 1 contain soils of different soil resistivity and/or are sprayed with conductive liquids of different water content and conductivity.
The invention also discloses a test platform test method for researching the electrochemical corrosion influence in the medium, the test platform comprises a power supply assembly, a circuit control assembly and a test assembly, the test assembly comprises a plurality of containers 1 for containing the test articles and a medium sprayer 2 for spraying conductive liquid, the medium sprayer 2 is arranged at the top of the container 1, the circuit control assembly comprises a plurality of adjustable current circuits which are in one-to-one correspondence with the containers 1, the power supply assembly comprises a power supply 3, two ends of any adjustable current circuit are respectively and electrically communicated with the power supply 3 and the test articles in the corresponding container 1, and the test method comprises the following steps:
step 20, spraying conductive liquid through the medium sprayer 2 to adjust the water content and the conductivity of the medium;
step 30, adjusting the current passing through the sample by adjusting the current of the adjustable current-saving circuit;
and step 40, performing the test under the test working conditions of different medium and current combinations. Such as: if the same medium is used in each container 1, if the test currents of large, medium and small three levels are desired to be distinguished, only the adjustable current circuit needs to be adjusted; assuming that different conductivity media are used for each vessel 1, if it is desired to study the effect of the conductivity of the media on the electrochemical corrosion using the same magnitude of test current, it is still only necessary to adjust the adjustable current circuit.
The invention has the beneficial effects that: the test platform for researching the influence of electrochemical corrosion in the medium can conveniently fix a test article on the platform, and meanwhile, the platform can be provided with conductive media with different water contents and conductivities, alternating currents with different sizes and frequencies and direct currents with different sizes and polarities according to the test requirements, so that various real environments of the test can be reduced to the maximum extent. The test platform is simple to operate, convenient and reliable, data acquisition is visual and effective, the efficiency of the test is greatly improved, and the test platform is high in popularization.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. The test platform for researching the influence of electrochemical corrosion in the medium is characterized by comprising a power supply assembly, a circuit control assembly and a test assembly, wherein the test assembly comprises a plurality of containers for containing the prepared samples and a medium sprayer for spraying conductive liquid, the medium sprayer is arranged at the top of the containers, the circuit control assembly comprises a plurality of adjustable current circuits in one-to-one correspondence with the containers, the power supply assembly comprises a power supply, and two ends of any adjustable current circuit are respectively electrically communicated with the power supply and the corresponding prepared samples in the containers.
2. The test platform for researching electrochemical corrosion influence in media according to claim 1, wherein the container is a cuboid with a pair of side surfaces being metal plates and the remaining surfaces being insulating materials, one side of the metal plate is grounded, and the other side of the metal plate is connected with the adjustable current circuit.
3. The test platform for studying the effect of electrochemical corrosion in a medium as claimed in claim 2, wherein said insulating material is an epoxy resin.
4. The test platform for researching on electrochemical corrosion influence in media according to claim 1, wherein each container is provided with a medium sprayer, a plurality of medium sprayers are used for introducing conductive liquid through a plurality of corresponding conduits, a plurality of conduits are used for introducing conductive liquid through a total water pipe, and only one conduit in the plurality of conduits is provided with air holes.
5. The test platform of claim 1, wherein the adjustable current-saving circuit comprises a switch, an adjustable resistor, and a current detector connected in series with each other.
6. The test platform for studying electrochemical corrosion effects in media of claim 5, wherein the adjustable current limiting circuit further comprises a rectifier circuit connected in series in the circuit, and a positive polarity rectifying branch, a negative polarity rectifying branch and a short circuit branch are arranged in the rectifier circuit and are connected in parallel with each other.
7. The test platform for investigating the effect of electrochemical corrosion in a medium of claim 5, wherein the power supply assembly comprises a power switch, the switch and the current detector being remotely controlled.
8. The test platform for studying the influence of electrochemical corrosion in media of claim 1, wherein the power supply module is composed of a frequency doubling power supply and a power frequency power supply in parallel.
9. The test platform of claim 1, wherein when there are at least two of said containers, different ones of said containers contain soil with different soil resistivity and/or are sprayed with conductive liquid with different water content and conductivity.
10. A test platform test method for researching electrochemical corrosion influence in media is characterized in that the test platform comprises a power supply assembly, a circuit control assembly and a test assembly, the test assembly comprises a plurality of containers for containing test articles and a medium sprayer for spraying conductive liquid, the medium sprayer is arranged at the top of each container, the circuit control assembly comprises a plurality of adjustable current circuits in one-to-one correspondence with the containers, the power supply assembly comprises a power supply, two ends of any adjustable current circuit are respectively electrically communicated with the power supply and the corresponding test articles in the containers, and the test method comprises the following steps:
step 10, placing a sample and a medium in the container;
step 20, spraying conductive liquid through the medium sprayer to adjust the water content and the conductivity of the medium;
step 30, adjusting the current passing through the test sample by adjusting the current of the adjustable current-saving circuit;
and step 40, performing a test under different test conditions of the medium and current combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010152975.1A CN111289429A (en) | 2020-03-06 | 2020-03-06 | Test platform and test method for researching electrochemical corrosion influence in medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010152975.1A CN111289429A (en) | 2020-03-06 | 2020-03-06 | Test platform and test method for researching electrochemical corrosion influence in medium |
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| CN111289429A true CN111289429A (en) | 2020-06-16 |
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| CN202010152975.1A Pending CN111289429A (en) | 2020-03-06 | 2020-03-06 | Test platform and test method for researching electrochemical corrosion influence in medium |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030169058A1 (en) * | 2000-05-04 | 2003-09-11 | Christian Pierre | System to measure the state of corrosion of buried metallic structures continuously in time and in length |
| CN102980823A (en) * | 2012-12-25 | 2013-03-20 | 北京科技大学 | Loop test device for imitating gas phase erosion corrosion of natural gas |
| CN104634721A (en) * | 2014-12-05 | 2015-05-20 | 国家电网公司 | Grounding grid accelerated corrosion testing device |
| CN107941686A (en) * | 2017-11-15 | 2018-04-20 | 清华大学 | Study the test simulation platform of iron pipe electrochemical corrosion and ductwork water quality change |
-
2020
- 2020-03-06 CN CN202010152975.1A patent/CN111289429A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030169058A1 (en) * | 2000-05-04 | 2003-09-11 | Christian Pierre | System to measure the state of corrosion of buried metallic structures continuously in time and in length |
| CN102980823A (en) * | 2012-12-25 | 2013-03-20 | 北京科技大学 | Loop test device for imitating gas phase erosion corrosion of natural gas |
| CN104634721A (en) * | 2014-12-05 | 2015-05-20 | 国家电网公司 | Grounding grid accelerated corrosion testing device |
| CN107941686A (en) * | 2017-11-15 | 2018-04-20 | 清华大学 | Study the test simulation platform of iron pipe electrochemical corrosion and ductwork water quality change |
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Effective date of registration: 20210707 Address after: No.85, Songshan South Road, Erqi District, Zhengzhou City, Henan Province Applicant after: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Applicant after: WUHAN University Applicant after: STATE GRID CORPORATION OF CHINA Address before: No.85, Songshan South Road, Erqi District, Zhengzhou City, Henan Province Applicant before: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Applicant before: STATE GRID CORPORATION OF CHINA |
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