CN114152727B - Grounding grid soil risk assessment method considering water content - Google Patents
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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 W p (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 U D Direct current operating voltage ofThe over-current sensing device measures the DC working current I generated by a certain section of grounding network under the DC working voltage sQ Transmitting 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 E 1Q ：
In the above formula, E 1Q A first assessment factor for the soil risk of the group Q of the grounding nets, I sQ For the direct operating current of the Q-th group of earthing networks, I zQ The 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 W p Substituting the formula into the formula to obtain a second evaluation factor E for the soil hazard characteristics of the grounding grid 2 ：
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 S 1 Is a first reference weight factor, S 2 Is 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 following beneficial effects:
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 W p (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 U D The 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) sQ Transmitting 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 E 1Q ：
In the above formula, E 1Q A first assessment factor for the soil risk of the group Q of the grounding nets, I sQ For the direct operating current of the Q-th group of earthing networks, I zQ The 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 water content W p Substituting the formula into the following formula to obtain a second evaluation factor E of the soil hazard characteristics of the grounding grid 2 ：
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 S 1 Is a first reference weight factor, S 2 Is 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 direct current generating device grounding module (3) and the test box grounding module (33) 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 water content of the soil and the direct current response of the grounding grid of each section:
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 W p (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 U D The 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) sQ Transmitting 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 I sQ Substituting the formula (1) to obtain a grounding grid soil risk evaluation factor E 1Q ：
In the above formula, E 1Q A first assessment factor for the soil risk of the group Q of the grounding nets, I sQ For the direct operating current of the Q-th group of earthing networks, I zQ The standard value of the direct current working current of the Q-th group grounding grid is set, T is the running time of the grounding grid, and Q is the total number of groups to be tested;
the measured comprehensive soil moisture content W p Substituting the formula (2) into the formula (2) to obtain a second evaluation factor E of the soil hazard characteristics of the grounding grid 2 ：
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 S 1 Is a first reference weight factor, S 2 Is 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.
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