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A Calculation Method for Transient Electromagnetic Response of Grounding Grid
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A technology of transient electromagnetic and calculation method, applied in the direction of fault location, etc., can solve the problem that the theoretical calculation of the transient electromagnetic response of the grounding grid has no relevant literature, etc.
Active Publication Date: 2019-10-11
JILIN UNIV
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At present, the breakpoint detection methods of the grounding grid mainly include the electric network method and the electromagnetic field method, but both methods need to rely on the grounding lead; in recent years, some scholars have used the transient electromagnetic method to detect the breakpoint of the grounding grid. Dependence on the grounding lead, but the theoretical calculation of the transient electromagnetic response of the grounding grid has no relevant literature
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[0037] see figure 1 combine figure 2 As shown, a calculation method for the transient electromagnetic response of the grounding grid, including:
[0038] 1). If figure 2 As shown, the ground grid is regarded as a planar grid, and the coil plane is regarded as a planar loop;
[0039] 2). For such as image 3 As shown in the schematic diagram of the ground grid model, the ground grid plane S 2 Divided into a large square plane S′ 2_1 and 4 small square planes S′ 2_j The combination of (j=2,3,4,5), namely Determine each square plane S' 2_j (j=1,2,3,4,5) center coordinates and size parameters. Ground grid plane S 2 The center coordinates of the grid are (0m, 0m, 0m), the side length of the small grid is 5m, and the conductor width of the ground grid is 0.04m.
[0040] 3). If image 3 As shown, the size of the transmitting coil is the same as that of the receiving coil, and the coil plane S 1 As a circle, the coil plane S 1 Divided into a large plane S′ 1_1 and a s...
Embodiment 2
[0054] The difference with embodiment 1 is: in step 4, when the coil plane is square, for the plane S 1 , the size is 2c×2d, and the center coordinates are (Tx 1 , Ty 1 , Tz 1 ), the current is K 1 , with the ground grid plane S 2 , the size is 2a×2b, and the center coordinates are (Tx 2 , Ty 2 , Tz 2 ) between the mutual inductance is M fm_fm as follows
[0055]
[0056] in,
[0057]
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Abstract
The invention relates to a method for calculating a transient electromagnetic response of a grounding grid. The invention firstly derives the mutual inductance calculation formula between the circularplane or the square plane and the square plane, and then calculates the mutual inductance between the grounding grid plane and the circular or square coil plane by using the mutual inductance calculation principle between the combined plane and the combined plane. The calculation mainly comprises: firstly, regarding the grounding grid as a planar grid, dividing the grounding grid plane S2 into aplurality of facets S'2_j (j=1, 2, 3...m), and obtaining the central coordinates and size parameters of each plane S'2_j; calculate the mutual inductance(IMG) between each plane S'2_j and each plane S'1_i, and calculating the mutual inductance(IMG) between the grounding grid plane S2 and the coil plane S1 by using the mutual inductance calculation principle between the combined plane and the combined plane; and inducing the calculated mutual inductance MTL between the grounding grid and the transmitting coil and the mutual inductance MRL between the grounding grid and the receiving coil into the induced voltage calculation formula to calculate the induced voltage VL of the grounding grid.
Description
technical field [0001] The invention relates to a method for calculating the transient electromagnetic response of a grounding grid, which is suitable for the research of detecting the topological structure and breakpoints of the grounding grid using a transient electromagnetic detection method, and can theoretically calculate the transient electromagnetic response of the grounding grid. Background technique [0002] The grounding grid is an important guarantee for the safe and stable operation of the substation. It is a grid-shaped metal conductor that is buried underground all year round. It will be corroded or even broken, resulting in a decrease in its grounding performance, which cannot guarantee the safe and stable operation of the substation. Therefore, it is necessary to detect the breakpoint of the grounding grid and repair it in time. At present, the breakpoint detection methods of the grounding grid mainly include the electric network method and the electromagneti...
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