CN111829943A - Test device for simulating soil corrosion of grounding grid and working method thereof - Google Patents
Test device for simulating soil corrosion of grounding grid and working method thereof Download PDFInfo
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Abstract
The invention relates to a test device for simulating the soil corrosion of a grounding grid and a working method thereof, which can effectively measure the corrosion rate of a grounding grid material under different soil environments by combining the service working conditions of the grounding grid. The test device comprises a test box body, a temperature and humidity control and regulation system, a soil parameter monitoring system, a power supply and a grounding simulation device. The power supply and the grounding simulation device are connected with the sample, so that the electrified state of the sample under the service condition can be simulated, the accurate simulation of the grounding grid environment is realized, the accuracy and the reliability of the soil corrosion test result of the grounding grid material are improved, and effective data support is provided for the evaluation and the screening of the corrosion resistance of the sample.
Description
Technical Field
The invention relates to the field of power systems, in particular to a test device for simulating soil corrosion of a grounding grid and a working method thereof.
Background
The grounding grid is an indispensable important device for work grounding, lightning protection grounding and protection grounding in a power system and ensuring the safety of people, equipment and systems. The grounding through the grounding grid can effectively prevent human body from electric shock, can also ensure the safe operation of a power system, and provides effective protection for the insulation of circuits and electrical equipment.
In the maintenance of the grounding grid, the corrosion resistance of the grounding grid plays an important role in the stable operation of the transformer substation. The service life of the grounding grid is prolonged, and the stable operation of the transformer substation is guaranteed, so that the important guarantee for the safe production and operation of power transmission and transformation of the power system is provided.
The electric power industry in China still keeps rapid growth within 15-20 years in the future, and a large number of ultra/extra-high voltage power transmission and transformation systems are required to be built for realizing national networking strategies of west-east power transmission and south-north mutual supply. With the increase of the voltage level, the transmission capacity is also increased, so that the short-circuit current of the transformer substation is also increased correspondingly, and the short-circuit current is increased to dozens of kA from the past several kA; the current frequency flowing through the grounding grid is very rich, and not only power frequency fault current but also high-frequency transient current of lightning stroke, operation and Very Fast Transient Overvoltage (VFTO) exist;
in the evaluation of the soil corrosion test of the grounding grid material, the experimental method of the soil corrosion resistance of the grounding grid material is mainly divided into outdoor on-site burying and indoor accelerated corrosion experiments. The outdoor site burying is to bury a large number of test pieces in typical soil, then excavate according to a certain burying period, and measure the weight loss rate and the corrosion rate of the test pieces. The method is simple and easy to implement, and the observed surface appearance of the sample and the measured data can reflect the corrosion resistance of the material more intuitively and truly, so the method is widely used in the early research of soil corrosion at home and abroad. However, because the experimental period is long, the information of the corrosion details and the corrosion kinetics of the material in the soil cannot be accurately and timely obtained, and thus the requirement of deep research on the corrosion of the material soil cannot be met.
The indoor accelerated corrosion experiment is an experiment method for artificially controlling experiment conditions and simulating accelerated corrosion, and aims to judge the tendency of a material to generate certain corrosion in various soils in a short time.
In the current technical scheme, a corrosion test and an acceleration test of a conventional metal material in a simulated soil environment can be effectively realized, and the acceleration mode comprises methods of increasing the soil temperature, passing current in the soil or introducing a galvanic couple and the like. However, for a special service environment of the grounding grid, the design device mentioned in the current technical scheme cannot meet the test of the soil corrosion environment of the grounding grid material. From the service condition of the grounding grid, the grounding grid material is influenced by soil environment parameters (water content, temperature, humidity, pH value, oxygen content and the like) in soil, and an important working condition parameter is the current passing through the grounding grid. In the service process of the grounding grid, currents with different sizes and frequencies can flow through the grounding grid material. This has a significant effect on the corrosion of the earth mat. Therefore, the important parameter needs to be introduced in the soil corrosion test of the simulated grounding grid.
Disclosure of Invention
In view of the above, the invention provides a test device for simulating the soil corrosion of a grounding grid and a working method thereof, aiming at the service working condition characteristics of the grounding grid, overcoming the defects existing in the existing soil corrosion simulation test device, and improving the accuracy and reliability of the soil corrosion test of the grounding grid material.
The invention is realized by adopting the following scheme: a test device for simulating the soil corrosion of a grounding grid comprises a test box body, a temperature and humidity control and regulation system, a soil parameter monitoring and regulation system, a power supply and a grounding simulation device; the temperature and humidity control and regulation system is used for regulating the humidity and the temperature of soil; the soil parameter monitoring system is used for monitoring soil parameters; a plurality of containers capable of loading test soil and samples are placed in the box body; a plurality of holes are formed in the peripheral side surface of the box body at positions higher than the container for loading the test soil and the sample, so that ventilation is realized; in each container loaded with soil and a sample in a box body, at least two graphite plates are placed around the container parallel to the sample, and the graphite plates are connected with a grounding point of a laboratory through a lead; a lead outlet is arranged on the side surface of the container, a lead A connected with the sample is led out and is connected with the anode of a power supply; meanwhile, the negative pole of the power supply is also connected with the grounding point of the laboratory.
Further, the working method of the test device for simulating the soil corrosion of the grounding grid comprises the following steps:
step S1: connecting any part of a sample with a lead A with an insulating sheath by welding or mechanical connection, and sealing the connection part by resin or glue;
step S2: when a sample is placed in the soil, a lead A is led out from an outlet on the side surface of the sample loading container and is connected with the anode of a power supply;
step S3: burying soil, and simultaneously placing graphite plates around the sample in parallel; simultaneously placing a temperature sensor, a humidity sensor, a soil parameter sensor and an electrochemical sensor;
step S4: after filling, connecting a lead connected with the graphite plate with a grounding point of a laboratory;
step S5: when a test is started, adjusting each control system to enable soil environment parameters and box body environment parameters to meet test requirements, and then adjusting a power supply to enable a grounding grid material to pass a certain amount of current to meet the requirement of simulating the working condition of the grounding grid;
step S6: in the test process, soil parameters and environmental parameters are monitored according to test requirements, and the current parameters passing through the sample are kept stable;
step S7: according to the test requirements, after the test is finished, cutting off the power supply, taking out the sample container, and analyzing and detecting the sample according to the soil sample detection related standard; if the test is a staged test, the power supply connected with the sample to be taken out is disconnected, and then the test to be measured is taken out for detection and analysis.
Further, the power supply adopts a direct current power supply or an alternating current power supply.
Further, the graphite plate has a size of 180mm × 50mm × 4 mm.
Further, a threaded hole is formed in the top end of the graphite plate, and the threaded hole is obtained by drilling and tapping the top end of the graphite plate.
Furthermore, the graphite plate is connected with the lead through a screw after the threaded hole is obtained, then the connection part of the screw and the lead is sealed by epoxy resin, and then the lead connected with the graphite plate is connected with a grounding point of a laboratory.
Further, the test sample is obtained from a grounding grid production line, and the grounding grid is made of 235 carbon steel or copper and galvanized steel.
Furthermore, the grounding grid is in a shape of a lath or a cylinder.
Further, the sampling size of the lath-shaped sample was 150mm × 40mm × 3mm, and the sampling size of the cylinder-shaped sample was Φ 20mm × 150 mm.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention not only meets the requirement of a conventional soil environment parameter control system, but also designs a grounding grid current control system aiming at the service working condition characteristics of the grounding grid. The device can effectively simulate the service working condition of the grounding grid material, realizes the accurate simulation of the service environment of the grounding grid, and greatly improves the reliability of the test result.
(2) The device can effectively measure the corrosion rate of the grounding grid material under different soil environments according to the relevant soil corrosion standard by combining the service working condition of the grounding grid.
(3) According to the invention, the power supply and the grounding device are introduced, the service working condition of the grounding net material in the soil environment can be effectively simulated through regulation and control, and the accuracy and reliability of the soil corrosion test of the grounding net material are improved;
(4) the direct-current power supply and the alternating-current power supply are arranged in the grounding grid, so that the service working conditions of the grounding grid under different power transmission service environments can be simulated, and a test can be performed in a targeted manner.
Drawings
FIG. 1 is a diagram showing the structure of an apparatus according to an embodiment of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiment provides a test device for simulating the soil corrosion of a grounding grid, which comprises a test box body, a temperature and humidity control and regulation system, a soil parameter monitoring and regulation system, a power supply and a grounding simulation device, wherein the temperature and humidity control and regulation system is connected with the power supply; the temperature and humidity control and regulation system is used for regulating the humidity and the temperature of soil; the soil parameter monitoring system is used for monitoring soil parameters; a plurality of containers capable of loading test soil and samples are placed in the box body; a plurality of holes are formed in the peripheral side surface of the box body at positions higher than the container for loading the test soil and the sample, so that ventilation is realized; in each container loaded with soil and a sample in a box body, at least two graphite plates are placed around the container parallel to the sample, and the graphite plates are connected with a grounding point of a laboratory through a lead; a lead outlet is arranged on the side surface of the container, a lead A connected with the sample is led out and is connected with the anode of a power supply; meanwhile, the negative pole of the power supply is also connected with the grounding point of the laboratory.
In this embodiment, an operating method for a test device for simulating ground net soil corrosion includes the following steps:
step S1: connecting any part of a sample with a lead A with an insulating sheath by welding or mechanical connection, and sealing the connection part by resin or glue;
step S2: when a sample is placed in the soil, a lead A is led out from an outlet on the side surface of the sample loading container and is connected with the anode of a power supply;
step S3: burying soil, and simultaneously placing graphite plates around the sample in parallel; simultaneously placing a temperature sensor, a humidity sensor, a soil parameter sensor and an electrochemical sensor;
step S4: after filling, connecting a lead connected with the graphite plate with a grounding point of a laboratory;
step S5: when a test is started, adjusting each control system to enable soil environment parameters and box body environment parameters to meet test requirements, and then adjusting a power supply to enable a grounding grid material to pass a certain amount of current to meet the requirement of simulating the working condition of the grounding grid;
step S6: in the test process, soil parameters and environmental parameters are monitored according to test requirements, and the current parameters passing through the sample are kept stable;
step S7: according to the test requirements, after the test is finished, cutting off the power supply, taking out the sample container, and analyzing and detecting the sample according to the soil sample detection related standard; if the test is a staged test, the power supply connected with the sample to be taken out is disconnected, and then the test to be measured is taken out for detection and analysis.
In this embodiment, the power supply is a dc power supply or an ac power supply.
In this example, the graphite plate has a size of 180mm × 50mm × 4 mm.
In this embodiment, a threaded hole is formed in the top end of the graphite plate, and the threaded hole is obtained by drilling and tapping the top end of the graphite plate.
In this embodiment, the graphite plate is connected to the wire by screws after obtaining the threaded holes, and then the screw and wire connection portions are sealed by epoxy resin, and then the wire connected to the graphite plate is connected to the grounding point of the laboratory.
In the embodiment, the test sample is obtained from a grounding grid production line, and the material of the grounding grid comprises 235 carbon steel or copper and galvanized steel.
In this embodiment, the grounding grid has a shape of a strip or a cylinder.
In this example, the sample size of the lath specimen was 150mm × 40mm × 3mm, and the sample size of the cylinder specimen was Φ 20mm × 150 mm.
Preferably, in this embodiment, a simulated grounding net material soil corrosion test device and method are designed according to the requirements of a grounding net material soil corrosion test and the current situation of the current soil corrosion test device and method, and by combining the service condition of the grounding net. On the basis of the conventional soil corrosion test device at present, a simulation device for simulating grounding in the service working condition of the grounding network is additionally arranged, and the simulation device comprises a power supply and a grounding device, so that the service working condition of the grounding network can be effectively simulated in the test. The device can truly reflect the corrosion characteristics of the grounding grid in the service working condition environment.
Preferably, in this embodiment, the test sample is subjected to test analysis according to soil corrosion-related standards. Relevant criteria include, but are not limited to, the following:
(1) ASTM G162-1999(2004) Standard protocols for conducting and evaluating laboratory soil Corrosion tests.
(2) T/CSTM _ 00045.1-2018 soil environment corrosion test-part 1-general rule.
(3) DL/T1554-2016 guide for evaluating soil corrosivity of grounding grid.
(4) General principles of corrosion testing for GB/T19291-.
(5) Removal of corrosion products from corrosion coupons of GB/T16545-1996 metals and alloys.
(6) Preparing, cleaning and evaluating a JB/T6074-92 corrosion sample.
Preferably, in this embodiment, the power supply includes two types, one type is an ac power supply, and the frequency of the ac power supply is adjustable, so as to meet the frequency characteristic requirements of the current passing through the grounding grid, including the power frequency and other frequencies. The alternating current power supply current and voltage are adjustable so as to meet the voltage and current requirements required by grounding grid working condition simulation. The other is a direct current power supply to meet the parameter requirement of the passing current of the analog grounding grid in the direct current power transmission and transformation environment.
Preferably, in this embodiment, in the preparation of the sample under test, the sample can be selected to have a suitable size and shape according to actual needs. In the present invention, it is required to connect a wire a with an insulating sheath to a certain portion of a sample by welding or mechanical connection and to seal the connection portion by resin or glue to prevent galvanic corrosion. The surface treatment of the sample is performed according to the relevant standards or requirements. When a sample is placed in the soil, the lead A is firstly led out from the outlet on the side surface of the container and is connected with the anode of the power supply. Then, soil is filled, graphite plates are arranged around the sample in parallel, and sensors such as related temperature, humidity and soil parameters, electrochemical sensors and the like are arranged according to needs. And ensures that the space used by the container is filled with test soil. After filling, the lead connected with the graphite plate is connected with the grounding point of the laboratory.
Preferably, the specific examples of the present embodiment are as follows:
the grounding grid material selected in the test of the embodiment is 235 carbon steel, and the grounding grid is sampled from a grounding grid production line and is in a shape of a lath or a cylinder. The sampling size of the lath sample is 150mm multiplied by 40mm multiplied by 3mm, and the sampling size of the cylinder sample is phi 20mm multiplied by 150 mm. The sample obtains the screw hole through punching, tapping to be connected wire and sample through the screw, then seal screw and wire junction through epoxy, avoid taking place galvanic corrosion. And then, carrying out oil removal and cleaning treatment on the sample for later use.
The soil is selected from typical acid red soil in southeast region of China, and the soil is dried, crushed and screened according to the soil corrosion test requirements to obtain the soil for the test.
The size of the graphite plate used in the test is 180mm multiplied by 50mm multiplied by 4mm, a threaded hole is obtained at the top end of the graphite plate through drilling and tapping, the lead is connected with the graphite plate through a screw, and then the connection part of the screw and the lead is sealed by epoxy resin. Avoid the corrosion of the screw and the lead. And then, degreasing, cleaning and drying the graphite plate. And (5) standby.
A container in a test box is taken, a certain amount of soil is firstly paved at the bottom, and then the sample and the graphite plate are discharged, so that the sample and the graphite plate are vertically placed and keep a certain distance. The cylindrical sample graphite plate and the sample are axially parallel to each other, 5 graphite plates are arranged, the lath-shaped sample is parallel to the working surfaces on the two sides of the sample, and the distance between the graphite plates and the sample is not less than 50 mm. The sample and the lead wire of the graphite plate were led out through the lead hole in the side of the container. Meanwhile, a temperature sensor, a humidity sensor, a soil moisture content sensor and the like are placed at appropriate positions, and all spaces of the container are filled with soil.
The graphite plate lead is connected with a grounding point of a laboratory, the sample lead is respectively connected with the positive pole of an alternating current power supply, and the negative pole of the power supply is connected with the grounding point of the laboratory.
The input ends of a temperature sensor, a humidity sensor, a soil moisture content sensor and the like are respectively connected with a temperature and humidity and soil moisture content measuring system.
The method comprises the steps of starting a temperature sensor, a humidity sensor, soil moisture content and other links to control an adjusting system, enabling the soil environment to meet test requirements, then starting a power supply, adjusting output current and voltage, enabling a sample to pass through appropriate current and voltage, and meeting the requirements of simulating the working condition of a grounding grid. The test was started. The period of the test is set as required. The current and the power supply output by the power supply can be used for monitoring and adjusting during the test.
The working condition parameters of the grounding current and grounding voltage characteristics in the service working condition of the grounding grid are fully considered. The test result which is closer to the actual working condition of the grounding grid can be obtained through the device of the embodiment. Has higher accuracy and reliability.
TABLE 1 comparison of conventional simulation test and test result of the device
| Test method | General soil simulation test | The device is tested |
| Corrosion rate, mm/a | 0.936 | 1.425 |
The test conditions are as follows:
the soil is Fujian acid red soil, and the test temperature is as follows: 30 ℃, sample: 235 carbon steel, soil moisture content: 15%, soil pH: 5.8, natural air environment, test time: for 90 days. The current density of the sample passing through the device is 15mA/cm2. Conventional soil simulation tests do not pass alternating current. The sample removal method after the test was carried out according to removal of corrosion products on corrosion test specimens of GB/T16545-1996 metals and alloys, and the corrosion rate was obtained by weight loss measurement.
The test result shows that the corrosion speed of the sample is higher after the alternating current is introduced through the device and is close to the corrosion speed under the actual working condition. The device can better simulate the service state of the grounding grid.
Preferably, the power supply and the grounding simulation device are connected with the test sample, so that the power-on state of the test sample under the service condition can be simulated, the accurate simulation of the grounding grid environment is realized, the accuracy and the reliability of the soil corrosion test result of the grounding grid material are improved, the above description is only the preferred embodiment of the invention, and all the equivalent changes and modifications made according to the patent scope of the invention belong to the coverage of the invention.
Claims (9)
1. The utility model provides a be used for simulation ground net soil corrosion test device which characterized in that: the device comprises a test box body, a temperature and humidity control and regulation system, a soil parameter monitoring and regulation system, a power supply and a grounding simulation device; the temperature and humidity control and regulation system is used for regulating the humidity and the temperature of soil; the soil parameter monitoring system is used for monitoring soil parameters; a plurality of containers capable of loading test soil and samples are placed in the box body; a plurality of holes are formed in the peripheral side surface of the box body at positions higher than the container for loading the test soil and the sample, so that ventilation is realized; in each container loaded with soil and a sample in a box body, at least two graphite plates are placed around the container parallel to the sample, and the graphite plates are connected with a grounding point of a laboratory through a lead; a lead outlet is arranged on the side surface of the container, a lead A connected with the sample is led out and is connected with the anode of a power supply; meanwhile, the negative pole of the power supply is also connected with the grounding point of the laboratory.
2. The working method of the test device for simulating the soil corrosion of the grounding grid based on the claim 1 is characterized in that: the method comprises the following steps:
step S1: connecting any part of a sample with a lead A with an insulating sheath by welding or mechanical connection, and sealing the connection part by resin or glue;
step S2: when a sample is placed in the soil, a lead A is led out from an outlet on the side surface of the sample loading container and is connected with the anode of a power supply;
step S3: burying soil, and simultaneously placing graphite plates around the sample in parallel; simultaneously placing a temperature sensor, a humidity sensor, a soil parameter sensor and an electrochemical sensor;
step S4: after filling, connecting a lead connected with the graphite plate with a grounding point of a laboratory;
step S5: when a test is started, adjusting each control system to enable soil environment parameters and box body environment parameters to meet test requirements, and then adjusting a power supply to enable a grounding grid material to pass a certain amount of current to meet the requirement of simulating the working condition of the grounding grid;
step S6: in the test process, soil parameters and environmental parameters are monitored according to test requirements, and the current parameters passing through the sample are kept stable;
step S7: according to the test requirements, after the test is finished, cutting off the power supply, taking out the sample container, and analyzing and detecting the sample according to the soil sample detection related standard; if the test is a staged test, the power supply connected with the sample to be taken out is disconnected, and then the test to be measured is taken out for detection and analysis.
3. The working method of the test device for simulating the soil corrosion of the grounding grid according to claim 2, characterized in that: the power supply adopts a direct current power supply or an alternating current power supply.
4. The working method of the test device for simulating the soil corrosion of the grounding grid according to claim 2, characterized in that: the graphite plates have the size of 180mm × 50mm × 4 mm.
5. The working method of the test device for simulating the soil corrosion of the grounding grid according to claim 2, characterized in that: the graphite plate is characterized in that a threaded hole is formed in the top end of the graphite plate, and the threaded hole is obtained by drilling and tapping the top end of the graphite plate.
6. The working method of the test device for simulating the soil corrosion of the grounding grid according to claim 5, characterized in that: and after the threaded hole is obtained, the graphite plate is connected with the lead through a screw, then the connection part of the screw and the lead is sealed by epoxy resin, and then the lead connected with the graphite plate is connected with a grounding point of a laboratory.
7. The working method of the test device for simulating the soil corrosion of the grounding grid according to claim 2, characterized in that: the test sample is obtained from a grounding grid production line, and the grounding grid is made of 235 carbon steel or copper and galvanized steel.
8. The working method of the test device for simulating the soil corrosion of the grounding grid according to claim 7, characterized in that: the grounding grid is in a shape of a lath or a cylinder.
9. The working method of the test device for simulating the soil corrosion of the grounding grid according to claim 8, characterized in that: the sampling size of the lath-shaped sample is 150mm multiplied by 40mm multiplied by 3mm, and the sampling size of the cylinder-shaped sample is phi 20mm multiplied by 150 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010701578.5A CN111829943B (en) | 2020-07-20 | 2020-07-20 | Working method for simulating soil corrosion test device of grounding grid |
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| CN114184766A (en) * | 2021-11-15 | 2022-03-15 | 西南交通大学 | Grounding grid soil hazard characteristic evaluation platform and method based on corrosive ions |
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