Adaptive finite-element ballooning analysis of bipolar ionized fields

Al-Hamouz, Z.M.

doi:10.1109/ias.1995.530468

Cited by 1 publication

(2 citation statements)

References 22 publications

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“…Previous investigators [2,6,7,9,10] used different values from the range of values as follows: for positive ion mobility, the values vary from 1.2 × 10 −4 to 1.5 × 10 −4 m 2 /(V·s) and for negative ion mobility, the values vary from 1.6 × 10 −4 to 1.9 × 10 −4 m 2 /(V·s). In this paper, the positive and negative values are both regarded as constant and taken at 1.3 × 10 −4 and 1.7 × 10 −4 m 2 /(V·s), respectively, which are same as previous literatures [2,6].…”

Section: Ftm For Analysing the Ionised Fieldmentioning

confidence: 99%

“…Abdel-Salam and Al-Hamouz [9] used the finite-element technique to solve the Poisson's equation with the assumption of equal positive and negative corona-onset voltage values. Al-Hamouz [10] developed the finite-element ballooning technique to improve the efficiency of calculation. The accuracy was further improved by the streamline upwind Petrov-Galerkin FEM [11].…”

Section: Introductionmentioning

confidence: 99%

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Calculation of the ionised field and the corona losses of high‐voltage direct current transmission lines using a finite‐difference‐based flux tracing method

Qiao

Zou

2015

IET Generation, Transmission & Distribution

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The electric field and ion current distribution on the ground level and corona losses are the important factors for designing high-voltage direct current (HVDC) transmission lines. This study presents a new finite-difference-based flux tracing (FDFT) method for analysing the ionised field. The differential equations are discretised using the finite-difference method and the non-linear algebraic equations are constructed. For the bipolar field, a systematic technique to set up the initial values is well established by estimating the average values of space charge density. The issues of the finite-difference scheme, the normalisation and the selection of mesh points are elaborately discussed to have a better convergence. The boundary conditions of the ionised field equations can be enforced directly, whose benefit is that the iterative process to satisfy the boundary conditions can be completely avoided. The numerical examples show that the results obtained in this study agree well with the ones published in other literatures. The FDFT could be applied for more complicated line configuration with unequal corona-onset electric fields and ion mobilities of opposite polarities.

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