CN114152727A - Grounding grid soil risk assessment method considering water content - Google Patents
Grounding grid soil risk assessment method considering water content Download PDFInfo
- Publication number
- CN114152727A CN114152727A CN202111336634.0A CN202111336634A CN114152727A CN 114152727 A CN114152727 A CN 114152727A CN 202111336634 A CN202111336634 A CN 202111336634A CN 114152727 A CN114152727 A CN 114152727A
- Authority
- CN
- China
- Prior art keywords
- grounding
- direct current
- grounding grid
- soil
- generating device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Remote Sensing (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a grounding grid soil risk assessment method considering moisture content, wherein a test platform in the grounding grid soil risk assessment method considering moisture content mainly comprises a direct current generating device, a direct current generating device controller, a direct current generating device grounding module, a current sensing device, a grounding grid external leading-out port, a numerical value acquisition module, a moisture sensor, a soil test box, a core control device and the like, and a grounding grid soil risk comprehensive assessment factor is obtained by measuring the moisture content of soil and direct current response of each section of the grounding grid.
Description
Technical Field
The invention belongs to the technical field of grounding of power systems, and particularly relates to a grounding grid soil risk assessment method considering water content.
Background
The grounding technology of the power system is an important effective measure for guaranteeing the electrical equipment and personal safety of a large power grid, a fault current or lightning dissipation channel is provided and is mainly realized through a grounding device or a grounding system, and the research of the grounding technology of the power system plays an irreplaceable role in the construction and operation of a novel power system in the future. The performance research aiming at the grounding grid body is the focus of attention of scholars at home and abroad at present, the research on the risk influence of the grounding grid soil with different water contents is lacked, and meanwhile, the related risk evaluation technology is also lacked. In nature, various geological environments exist, the water content of soil influences the normal drainage of a grounding grid, and further, the potential of the grounding grid is abnormally increased, so that serious hazards such as secondary equipment insulation damage are caused. In order to better improve grounding stability and ensure good insulation of secondary equipment, a grounding grid soil risk assessment method considering water content needs to be researched urgently, and important reference can be provided for ensuring stable operation of a power system and mastering a better grounding grid operation state.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a ground net soil risk assessment method considering the water content.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
firstly, a grounding grid soil risk testing platform is built, and the platform comprises a direct current generating device, a direct current generating device controller, a direct current generating device grounding module, a first high-voltage cable, a current sensing device, a grounding grid external connection leading-out port, a numerical value acquisition module, a first moisture sensor, a second moisture sensor, a soil test box, a grounding grid, a core control device and a test box grounding module;
the grounding module of the direct current generating device and the grounding module of the test box are both reliably grounded;
the upper end of the direct current generating device is electrically connected with the left end of the first high-voltage cable, the right end of the first high-voltage cable is electrically connected with the left end of the current sensing device, the right end of the current sensing device is electrically connected with an external leading-out port of a grounding grid, the external leading-out port of the grounding grid is electrically connected with the grounding grid, the lower end of the direct current generating device is electrically connected with the upper end of a direct current generating device controller, and the lower end of the direct current generating device controller is electrically connected with the core control device;
the soil test box comprises a first moisture sensor, a second moisture sensor and a grounding grid, wherein the first moisture sensor and the second moisture sensor are respectively and electrically connected with a numerical value acquisition module, and the numerical value acquisition module is electrically connected with a core control device;
step two, measuring the soil moisture content and the direct current response of each section of the grounding grid:
measuring specific water content in the soil through the first water sensor and the second water sensor to obtain comprehensive soil water content Wp(ii) a Then, the grounding grid is segmented according to the external leading-out port of the grounding grid, and direct current working current testing is carried out on each segment of the grounding grid, and the method specifically comprises the following steps: the core control device controls the controller of the direct current generating device and sets the output amplitude of the direct current generating device to be UDThe direct current working voltage is obtained by measuring the direct current working current I generated by a certain section of grounding grid under the direct current working voltage through a current sensing devicesQTransmitting the data to a core control device through a numerical value acquisition module, connecting a current output port and a backflow port of the direct current generation device with external outgoing line ports of other sections of grounding networks, and repeating the test steps to obtain q groups of direct current working current sampling data;
thirdly, obtaining a grounding grid soil risk evaluation factor E1Q：
In the above formula, E1QA first assessment factor for the soil risk of the group Q of the grounding nets, IsQFor the direct operating current of the Q-th group of earthing networks, IzQThe standard value of the direct current working current of the Q-th group of grounding grids is set, T is the running time of the grounding grids, and Q is the total number of groups to be tested;
the measured comprehensive soil moisture content WpSubstituting the formula to obtain a second evaluation factor E of the soil hazard characteristics of the grounding grid2：
And fourthly, obtaining a comprehensive evaluation factor E of the soil risk of the grounding grid based on the water content based on the steps:
wherein S1Is a first reference weight factor, S2Is a second baseline weight factor;
when E belongs to (0, 0.14), the soil risk of the grounding grid is obvious and the grounding system needs to be replaced or overhauled immediately, and when E belongs to (0.14, infinity), the soil risk of the grounding grid is general and the grounding grid can be maintained properly and regularly.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention provides an evaluation method capable of obtaining a segmented sampling and weight factor;
2) the evaluation method can obtain the comprehensive evaluation factor of the grounding grid soil risk based on the water content, and carry out the grounding soil risk evaluation.
Drawings
FIG. 1 is a schematic diagram of the general structure of a grounding grid soil risk testing platform in use according to the present invention;
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
Fig. 1 shows that the experimental platform and method provided by the present invention include the following steps:
the method comprises the steps that firstly, a grounding grid soil risk testing platform is set up, and the platform comprises a direct current generating device (1), a direct current generating device controller (2), a direct current generating device grounding module (3), a first high-voltage cable (4), a current sensing device (5), a grounding grid external connection leading-out port (7), a numerical value collecting module (8), a first moisture sensor (9), a second moisture sensor (10), a soil test box (11), a grounding grid (12), a core control device (13) and a test box grounding module (33);
the grounding module (3) of the direct current generating device and the grounding module (33) of the test box are both reliably grounded;
the upper end of the direct current generating device (1) is electrically connected with the left end of a first high-voltage cable (4), the right end of the first high-voltage cable (4) is electrically connected with the left end of a current sensing device (5), the right end of the current sensing device (5) is electrically connected with an external grounding grid leading-out port (7), the external grounding grid leading-out port (7) is electrically connected with a grounding grid (12), the lower end of the direct current generating device (1) is electrically connected with the upper end of a direct current generating device controller (2), and the lower end of the direct current generating device controller (2) is electrically connected with a core control device (13);
the soil test box (11) comprises a first moisture sensor (9), a second moisture sensor (10) and a grounding grid (12), the first moisture sensor (9) and the second moisture sensor (10) are respectively and electrically connected with the numerical value acquisition module (8), and the numerical value acquisition module (8) is electrically connected with the core control device (13);
step two, measuring the soil moisture content and the direct current response of each section of the grounding grid:
measuring specific water content in the soil through a first water sensor (9) and a second water sensor (10) to obtain comprehensive soil water content Wp(ii) a Then, the grounding grid (12) is segmented according to a leading-out port (7) externally connected with the grounding grid, and direct current working current testing is carried out on each segment of the grounding grid (12), and the method specifically comprises the following steps: the core control device (13) controls the DC generator controller (2) and sets the output amplitude of the DC generator (1) to be UDThe direct current working voltage is measured by a current sensing device (5) to generate direct current working current I under the direct current working voltage of a certain section of grounding grid (12)sQTransmitting the data to a core control device (13) through a numerical value acquisition module (8), connecting a current output port and a backflow port of the direct current generating device (1) with external outgoing line ports of other sections of grounding networks, and repeating the test steps to obtain q groups of direct current working current sampling data;
thirdly, obtaining a grounding grid soil risk evaluation factor E1Q：
In the above formula, E1QA first assessment factor for the soil risk of the group Q of the grounding nets, IsQFor the direct operating current of the Q-th group of earthing networks, IzQThe standard value of the direct current working current of the Q-th group of grounding grids is set, T is the running time of the grounding grids, and Q is the total number of groups to be tested;
the measured comprehensive soil moisture content WpSubstituting the formula into the following formula to obtain a second evaluation factor E of the soil hazard characteristics of the grounding grid2：
And fourthly, obtaining a comprehensive evaluation factor E of the soil risk of the grounding grid based on the water content based on the steps:
wherein S1Is a first reference weight factor, S2Is a second baseline weight factor;
when E belongs to (0, 0.14), the soil risk of the grounding grid is obvious and the grounding system needs to be replaced or overhauled immediately, and when E belongs to (0.14, infinity), the soil risk of the grounding grid is general and the grounding grid can be maintained properly and regularly.
Claims (1)
1. A grounding grid soil risk assessment method considering water content is characterized by comprising the following steps:
the method comprises the steps that firstly, a grounding grid soil risk testing platform is set up, and the platform comprises a direct current generating device (1), a direct current generating device controller (2), a direct current generating device grounding module (3), a first high-voltage cable (4), a current sensing device (5), a grounding grid external connection leading-out port (7), a numerical value collecting module (8), a first moisture sensor (9), a second moisture sensor (10), a soil test box (11), a grounding grid (12), a core control device (13) and a test box grounding module (33);
the grounding module (3) of the direct current generating device and the grounding module (33) of the test box are both reliably grounded;
the upper end of the direct current generating device (1) is electrically connected with the left end of a first high-voltage cable (4), the right end of the first high-voltage cable (4) is electrically connected with the left end of a current sensing device (5), the right end of the current sensing device (5) is electrically connected with an external grounding grid leading-out port (7), the external grounding grid leading-out port (7) is electrically connected with a grounding grid (12), the lower end of the direct current generating device (1) is electrically connected with the upper end of a direct current generating device controller (2), and the lower end of the direct current generating device controller (2) is electrically connected with a core control device (13);
the soil test box (11) comprises a first moisture sensor (9), a second moisture sensor (10) and a grounding grid (12), the first moisture sensor (9) and the second moisture sensor (10) are respectively and electrically connected with the numerical value acquisition module (8), and the numerical value acquisition module (8) is electrically connected with the core control device (13);
step two, measuring the soil moisture content and the direct current response of each section of the grounding grid:
measuring specific water content in the soil through a first water sensor (9) and a second water sensor (10) to obtain comprehensive soil water content Wp(ii) a Then, the grounding grid (12) is segmented according to a leading-out port (7) externally connected with the grounding grid, and direct current working current testing is carried out on each segment of the grounding grid (12), and the method specifically comprises the following steps: the core control device (13) controls the DC generator controller (2) and sets the output amplitude of the DC generator (1) to be UDThe direct current working voltage is measured by a current sensing device (5) to generate direct current working current I under the direct current working voltage of a certain section of grounding grid (12)sQTransmitting the data to a core control device (13) through a numerical value acquisition module (8), connecting a current output port and a backflow port of the direct current generating device (1) with external outgoing line ports of other sections of grounding networks, and repeating the test steps to obtain q groups of direct current working current sampling data;
thirdly, obtaining the direct current working current IWSubstituting the formula (1) to obtain the soil risk of the grounding gridEvaluation factor E1Q：
In the above formula, E1QA first assessment factor for the soil risk of the group Q of the grounding nets, IsQFor the direct operating current of the Q-th group of earthing networks, IzQThe standard value of the direct current working current of the Q-th group of grounding grids is set, T is the running time of the grounding grids, and Q is the total number of groups to be tested;
the measured comprehensive soil moisture content WpSubstituting the formula (2) into the formula (2) to obtain a second evaluation factor E of the soil hazard characteristics of the grounding grid2：
And fourthly, obtaining a comprehensive evaluation factor E of the soil risk of the grounding grid based on the water content based on the steps:
wherein S1Is a first reference weight factor, S2Is a second baseline weight factor;
when E belongs to (0, 0.14), the soil risk of the grounding grid is obvious and the grounding system needs to be replaced or overhauled immediately, and when E belongs to (0.14, infinity), the soil risk of the grounding grid is general and the grounding grid can be maintained properly and regularly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111336634.0A CN114152727B (en) | 2021-11-12 | 2021-11-12 | Grounding grid soil risk assessment method considering water content |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111336634.0A CN114152727B (en) | 2021-11-12 | 2021-11-12 | Grounding grid soil risk assessment method considering water content |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114152727A true CN114152727A (en) | 2022-03-08 |
| CN114152727B CN114152727B (en) | 2022-08-05 |
Family
ID=80459686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111336634.0A Active CN114152727B (en) | 2021-11-12 | 2021-11-12 | Grounding grid soil risk assessment method considering water content |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114152727B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101504404A (en) * | 2009-03-03 | 2009-08-12 | 广东电网公司佛山供电局 | Soil corrosivity evaluation method for substation grounding network in Guangdong area |
| CN103499680A (en) * | 2013-09-27 | 2014-01-08 | 国家电网公司 | Soil corrosiveness evaluation method for grounding grid of transformer substation |
| CN108008197A (en) * | 2017-12-01 | 2018-05-08 | 广东电网有限责任公司佛山供电局 | A kind of Tower Impulse Grounding Resistance measuring method for considering soil space moisture distribution |
| CN109188901A (en) * | 2018-07-27 | 2019-01-11 | 西北工业大学 | A kind of earth-moon system mixing sail periodic orbit keeping method based on interference observer |
| CN109188090A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | The nonlinear test method of different humidity electric resistance of soil in vertical demixing soil |
| CN110361579A (en) * | 2019-08-04 | 2019-10-22 | 西南交通大学 | Transmission line of electricity two phase ground safety of surrounding environment evaluation system and method under stratified soil |
| CN112595661A (en) * | 2020-12-23 | 2021-04-02 | 国网辽宁省电力有限公司电力科学研究院 | Multidimensional coupling evaluation test system for grounding grid conductor material |
| US20210223226A1 (en) * | 2018-05-11 | 2021-07-22 | Stenon Gmbh | Devices and methods for in situ soil analysis |
-
2021
- 2021-11-12 CN CN202111336634.0A patent/CN114152727B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101504404A (en) * | 2009-03-03 | 2009-08-12 | 广东电网公司佛山供电局 | Soil corrosivity evaluation method for substation grounding network in Guangdong area |
| CN103499680A (en) * | 2013-09-27 | 2014-01-08 | 国家电网公司 | Soil corrosiveness evaluation method for grounding grid of transformer substation |
| CN108008197A (en) * | 2017-12-01 | 2018-05-08 | 广东电网有限责任公司佛山供电局 | A kind of Tower Impulse Grounding Resistance measuring method for considering soil space moisture distribution |
| US20210223226A1 (en) * | 2018-05-11 | 2021-07-22 | Stenon Gmbh | Devices and methods for in situ soil analysis |
| CN109188901A (en) * | 2018-07-27 | 2019-01-11 | 西北工业大学 | A kind of earth-moon system mixing sail periodic orbit keeping method based on interference observer |
| CN109188090A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | The nonlinear test method of different humidity electric resistance of soil in vertical demixing soil |
| CN110361579A (en) * | 2019-08-04 | 2019-10-22 | 西南交通大学 | Transmission line of electricity two phase ground safety of surrounding environment evaluation system and method under stratified soil |
| CN112595661A (en) * | 2020-12-23 | 2021-04-02 | 国网辽宁省电力有限公司电力科学研究院 | Multidimensional coupling evaluation test system for grounding grid conductor material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114152727B (en) | 2022-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2014173314A1 (en) | System for testing property of thunder and lightning traveling wave of power transmission line | |
| CN203759497U (en) | Intelligent electrical equipment condition monitoring and fault diagnosis system | |
| CN105137158A (en) | Power system temporary overvoltage monitoring system | |
| CN103712551A (en) | Power distribution network transformer low-voltage winding deformation on-line monitoring device and method | |
| CN106597147A (en) | State monitoring system and method of lightning arrester with series gap based on residual voltage monitoring | |
| CN202141752U (en) | Online monitoring device for metal zinc oxide lightning arrester | |
| CN106707030A (en) | Method and device for measuring grounding impedance and power loss of distribution transformer | |
| CN115542073A (en) | High tension transmission line abnormity alarm system | |
| CN207882393U (en) | A kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus | |
| CN104111381A (en) | Dielectric loss on-line monitoring device for 35kV high voltage parallel connection power capacitor group | |
| CN114152727B (en) | Grounding grid soil risk assessment method considering water content | |
| CN204575773U (en) | The impedance of grounding net of transformer substation frequency sweep and the automatic test diagnosis equipment of amplitude-frequency response | |
| CN207964994U (en) | Grounding net of transformer substation health status detection device | |
| CN201378176Y (en) | High-precision anti-interference excitation power supply for ground screen flaw comprehensively-diagnosing system in transformer substation | |
| CN116338377A (en) | Method and system for acquiring data on line in real time and realizing ground network fault monitoring | |
| CN203396822U (en) | On-line monitoring device for grounding currents flowing through sheaths of high-voltage single-core cables | |
| CN206193104U (en) | Measurement device for distribution transformer earth impedance , power consumption | |
| CN115166420A (en) | Fault positioning method and system based on single-phase earth fault negative sequence current phase | |
| CN109631987A (en) | A kind of multi-parameter integrated monitoring and warning system of cable | |
| CN205449765U (en) | Electric power system ground net corrosion monitoring system | |
| CN203848796U (en) | On-line monitoring device of power distribution network transformer low-voltage winding deformation | |
| CN206696351U (en) | A kind of pilot system of wind power collection system of offshore wind power plant high frequency transient characteristic research | |
| Jin et al. | Analysis and calculation of ground potential rise of electric vehicle charging station struck by lightning | |
| CN112198369A (en) | Method for measuring impedance of grounding grid under strong harmonic wave | |
| CN108152569A (en) | Cable overvoltage signal detection method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |