Method for improving the potential distribution of insulators in transmission lines in dirty and humid environment
A technology for wet environment and transmission lines, applied in the installation of cables, electrical components, overhead installation, etc., can solve problems such as hidden dangers in the operation of transmission lines, and achieve the effects of high power supply reliability, good economic benefits, and good safety.
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Embodiment 1
[0037] According to an embodiment of the present invention, a method for improving the potential distribution of insulators in a transmission line in a dirty and humid environment is provided, which is characterized in that it includes:
[0038] a. Based on the historical data of overhead transmission lines, select the flashover frequent section of overhead transmission lines, and select the most frequently used section from the flashover frequent section: towers, wires, and organic composite insulators and tempered glass insulator strings;
[0039] b. In a clean and dry ideal environment, use the three-dimensional model as the finite element model, and incorporate the towers and wires selected in step a into the three-dimensional model, and set artificial boundaries through zero-order asymptotic boundary conditions to truncate the wireless large-scale area to a limited area. area, where: the size of the artificial boundary is based on the fact that the electric field around th...
Embodiment 2
[0046] The difference from the above-mentioned embodiment is that in this embodiment, the finite element models in steps b and c of the above-mentioned embodiment 1 all adopt the following subdivision method: first, the longitudinal interface between the organic composite insulator and the tempered glass insulator string is Surface subdivision, and then take the center line of the organic composite insulator and tempered glass insulator as the axis to surround the entire organic composite insulator and tempered glass insulator string for volume subdivision. The inventors found that using the general method to subdivide an insulator not only takes a long time to subdivide, but also requires a large amount of calculation, and the error between the subdivided finite element model and the original geometric model is relatively large, but this embodiment can effectively reduce the The calculation amount of the simulation.
Embodiment 3
[0048] Different from the above-mentioned embodiment, in this embodiment, the parameter setting of the tower in the model of the above-mentioned embodiment 1 is based on the parameters in the actual line, and the value of the wire length in the model is to reduce the electric field around the insulator at both ends of the wire. influence prevails. For those skilled in the art, the parameter setting principles of the components in the simulation are inclined to the actual parameters in reality, or to ideal modeling, and there is another tendency, which intends to combine the advantages of the first two tendencies. The above parameter setting principles all aim to balance the parameters in practice and the parameters in ideal modeling, but as far as this embodiment is concerned, this embodiment is only intended to limit a specific parameter about the tower and wire in the model As for the setting principle, those skilled in the art can of course also base on the tendency of the ...
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