Electric Field and Ion Current Environment of HVdc Transmission Lines: Comparison of Calculations and Measurements

Abstract

The electric field and ion current environment under HVdc transmission lines is an important design consideration. The flux tracing method (FTM) for calculating the ground-level electric field and ion current density distributions is reviewed and the possible errors caused by the use of Deutsch's assumption in the FTM are estimated. Experimental data obtained under one dc test line and three operating dc transmission lines are compared with calculations made with the FTM. The results show that the most important factor influencing the electric field and ion current distributions is the corona onset gradient of the conductors, or indirectly, the conductor surface roughness factor. The results also show that for practical dc transmission-line configurations, any errors caused by Deutsch's assumption are quite small compared with the observed variations in experimental data.

Improved Coupled Ion-Flow Field Calculation Method for AC/DC Hybrid Overhead Power Lines

“…The proposed method, called the iterative method of characteristics (IMoC), follows the same philosophy as the flux tracing method presented by Maruvada [9], [12], [22]. The key advantage of the proposed procedure is that the Deutsch assumption is not necessary.…”

“…The Deutsch assumption that states that the direction of the electric field is not influenced by the ions is one of the oldest methods [8], [9]. Even though the Deutsch assumption has been criticized [10], [11], it is still frequently used for solving the ion-flow problem [12], [13]. Other methods that have been used are based on the charge simulation method (CSM) [14].…”

Surface aging effects of long-term energized conductors on spectrum characteristics of audible noise

“…11 The corona characteristics are largely depended on the conductor surface condition, which is a function of the surrounding atmospheric environment including temperature, humidity, relative air density, aerosol, atmospheric pollution etc. 12,13 Recent years, scanning electron microscopy (SEM) and three-dimensional phase shift MicroXam have been employed to measure the surface morphology of the aged conductors which had been energized for about 12, 15 and 20 years in 500 kV and 220 kV alternating current (AC) power grid. 14,15 The aging degree of the longterm operating conductors of power transmission lines are different from that of the new ones, a Author to whom correspondence should be addressed, e-mail: yiyongshanxi@126.con; wanglm@sz.tsinghua.edu.cn 2158-3226/2017/7(9)/095020/6 7, 095020-1 © Author(s) 2017 095020-2…”

Calculation on the Ion Flow Field under HVDC Transmission Lines Considering Wind Effects

“…The calculation on the electric field has received wide attentions [2][3][4][5][6][7][8][9][10][11][12][13][14][15] involving the methods based on Deutsch assumption [2][3][4][5][6][7] and the mesh-based methods [8][9][10][11][12][13][14]. Deutsch assumption supposes that space charges affect only the magnitude of the electric field without changing its direction.…”