Method for predicting corona inception field intensity of EHV/UHV divided conductor by considering altitude correction

A technology of halo initiation field strength and split wires, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as limiting the use of Peek formulas, and achieve the effect of improving safety and economy

Active Publication Date: 2018-08-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

With the increase of the voltage level of the transmission line, in order to effectively control the level of the corona effect, the design of the transmission l

Method used

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  • Method for predicting corona inception field intensity of EHV/UHV divided conductor by considering altitude correction
  • Method for predicting corona inception field intensity of EHV/UHV divided conductor by considering altitude correction
  • Method for predicting corona inception field intensity of EHV/UHV divided conductor by considering altitude correction

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Embodiment 1

[0026] A method for predicting the halo intensity of split conductors considering altitude correction, comprising the following steps:

[0027] Step 1: Build a predictive model:

[0028]

[0029] Among them, n is the split number, r 0 is the radius of the sub-conductor, a 4 , b 4 , c are the first to third parameters of the model respectively; δ' is the relative air density parameter, and the calculation method is:

[0030]

[0031] In the formula: H is the altitude above sea level in kilometers; k 1 is the fourth model parameter;

[0032] Step 2: Measure the altitude H and the radius r of the sub-conductor 0 , split number n;

[0033] Step 3: Calculate the halo field strength value.

[0034] The first to fourth parameters are: 35.75, 0.74, -1.34, 10.7 sub-wire radius 1.34cm≤r 0 ≤1.995cm, split number 4≤n≤12, altitude 19m≤H≤4000m.

[0035] This embodiment can accurately predict the halo initiation field strength of the sub-conductor with a radius of 1.34cm-1.995...

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Abstract

The invention discloses a method for predicting the corona inception field intensity of an EHV/UHV divided conductor by considering altitude correction, which comprises the steps of building a prediction model, measuring parameter values and calculating the predicted field intensity. The preferable field intensity prediction model is defined in the description. According to the invention, an actual corona inception field intensity value of the divided conductor at the altitude point can be obtained under the premise of substituting the known altitude, the sub-conductor radius and the number ofdivisions into a corona inception field intensity calculation formula, and the calculation result is obviously better than that of a Peek formula. The corona inception field intensity values of divided conductors of EHV/UHV alternating current transmission lines at different altitudes can be accurately calculated, thereby providing a reference for the design of conductor selection of EHV/UHV overhead lines in a high-altitude area, and achieving a purpose of improving the operation safety and economy of the transmission lines.

Description

technical field [0001] The invention relates to a method for predicting the halo initiation field strength of an ultra-ultra-high voltage split conductor, in particular to a method for predicting the halo initiation field strength of a split conductor considering altitude correction, and belongs to the technical field of external insulation of power system transmission lines. Background technique [0002] As an important parameter in the design of transmission lines, the haloing field strength of conductors is related to the electromagnetic environment of the line. If the design margin of the surface field strength of the wire is too small, it will generate high corona loss, audible noise, and radio interference levels, resulting in the deterioration of the electromagnetic environment; if the margin is too large, it is necessary to use a larger cross-section and more The number of split wires and the corresponding increase in the mechanical strength of the tower lead to econ...

Claims

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Application Information

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IPC IPC(8): G01R31/12G06F17/50
CPCG01R31/1272G06F30/367
Inventor 黄世龙刘云鹏陈少帅刘达然陈思佳黄志成
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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