Distribution line flashover rate acquisition method based on electrical geometric model
An electrical geometric model, a technology for distribution lines, applied in the direction of measuring electricity, measuring electrical variables, testing dielectric strength, etc., can solve problems such as low calculation accuracy
Pending Publication Date: 2021-03-12
国网新疆电力有限公司建设分公司 +2
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Problems solved by technology
[0003] The present invention provides a distribution line flashover rate acquisition method based on an electrical geometric model, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem existing in the calculation of the distribution line flashover rate. Straight down, but in fact the direction and angle of lightning strikes are random, which causes the problem of low calculation accuracy
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Embodiment 1
[0024] Embodiment 1: as attached figure 1 , 2 As shown, the distribution line flashover rate acquisition method based on the electrical geometric model includes the following steps:
[0025] Step 1: Collect various data, including the instantaneous value Uph of the operating voltage of the conductor, the average height of the catenary conductor hc, av, and the lightning current I;
[0026] Step 2: Select the strike distance calculation formula to calculate the strike distance rs of the lightning to the reinforcing wire, the strike distance rc of the lightning to the conductor and the rg of the strike distance of the lightning to the ground;
[0027] r s =10I 0.65
[0028] r c =1.63(5.015I 0.578 -0.001U ph )
[0029]
[0030] The above rs is the strike distance of lightning to the reinforcing wire; rc is the strike distance of lightning to the wire; rg is the strike distance of lightning to the earth; I is the lightning strike current in kA; rs is the strike distance...
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The invention relates to the technical field of electrical engineering, in particular to a distribution line flashover rate acquisition method based on an electrical geometric model. The method comprises the following steps: 1, collecting various data, 2, selecting a strike distance calculation formula, 3, calculating an accumulated incident angle probability g (psi) through a probability densitydistribution function; 4, establishing an electrical geometric model; and 5, according to the electrical geometric model drawn in the step 4, calculating the exposure area of the lightning pilot whenthe lightning is incident at an angle psi, and further calculating the projection area along the horizontal direction, calculating the cumulative incident angle probability through a probability density distribution function, and meanwhile, calculating the exposure area according to the electrical geometric model, further deducing the shielding failure flashover rate of the traction network when the lightning pilot incident at the angle psi strikes the traction network. The incident angle of lightning is considered into a calculation formula, so that the calculated structure is more accurate.
Description
technical field [0001] The invention relates to the technical field of electrical engineering, and relates to a method for obtaining the flashover rate of a distribution line based on an electrical geometric model. Background technique [0002] Distribution lines bear the heavy responsibility of directly distributing power to low-voltage loads. As the last link to connect users and control power quality, the safety and reliability of distribution network operation is the basis for ensuring power quality. As a characteristic parameter of distribution line risk assessment, the flashover rate comprehensively considers the influence of the lightning resistance level of the line, the lightning activity in the area where the line passes, the equivalent lightning width of the line, and the probability distribution of lightning current. The causes of faults such as lightning strike and disconnection can evaluate the risk of faults such as lightning tripping and lightning strike disc...
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IPC IPC(8): G01R31/12G06F17/18
CPCG01R31/1272G06F17/18
Inventor 齐军闵令民杨书英郭俊俊张寰宇赵文馨熊灿郭金龙
Owner 国网新疆电力有限公司建设分公司