Abstract
In this work, an effective calculation method of the ion flow field that considers the impact of wind flow and water drops is presented. To be explicit, the nominal electric field is solved by the charge simulation method (CSM) whilst the space charge density is calculated adopting a second order upwind finite volume method. In addition, a method that determines the roughness factor of a conductor surface is used to enhance calculation accuracy. The influence of various properties of the water drops exerting on an ion flow field is analyzed. Eventually, a practical experiment is conducted to verify the calculated result, and the effectiveness and reliability of this method are then proved via comparing calculated and measured results.
Highlights
IntroductionThe electromagnetic environment near a high voltage DC (HVDC) transmission line is a primary concern in the electric power system, especially in certain meteorological conditions of fog and rain
The electromagnetic environment near a high voltage DC (HVDC) transmission line is a primary concern in the electric power system, especially in certain meteorological conditions of fog and rain.In such conditions, the water drops that impinge on the conductor decrease the surface roughness factor and subsequently reduce the onset voltage of corona discharge
The other water drops suspending around the conductor will be charged, and the ion flow field is affected to a certain degree
Summary
The electromagnetic environment near a high voltage DC (HVDC) transmission line is a primary concern in the electric power system, especially in certain meteorological conditions of fog and rain. In such conditions, the water drops that impinge on the conductor decrease the surface roughness factor and subsequently reduce the onset voltage of corona discharge. The other water drops suspending around the conductor will be charged, and the ion flow field is affected to a certain degree. Accurate calculation of an ion flow field has the benefit of safe operation and provides a design basis of a transmission line when it goes across areas with greater precipitation and lower temperature Since the corona discharge and the concomitant ion flow field may lead to issues of radiation interference, noise interference and corona loss, investigation of the ion flow field under foggy and rainy weathers, in where the ion flow field is distorted in a more intensive manner, becomes inevitable.
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