Research on Potential Distributions of Soil Surface Caused by Ground Electrode of HVDC System in Heterogeneous Soil Structure

Author

Liu, Qu ; Li, LiCheng ; Zheng, Jianchao ; Guan, Zhicheng

Author_Institution

Tsinghua Univ., Beijing

fYear

2007

fDate

24-28 June 2007

Firstpage

1

Lastpage

4

Abstract

The soil model represents a fundamental role concerning the design of the ground electrode. It is important to analyze the influence on transformers caused during HVDC mono-polar operation. The surface potential affects the distribution of DC currents flowing through the neutrals of transformers. Sea is larger in area and less in resistivity than land. By mean of deriving the Green´s function in horizontal-layer and vertical-layer soil structures, the formula of in complex soil layer for calculating potential is derived using the concept of image. Simulation results show the surface potential closed to sea will drop to zero influenced by sea. The lower potential of substation makes more DC current of power grid flow through transformer neutrals.

Keywords

Green´s function methods; HVDC power convertors; earth electrodes; power grids; transformers; Green´s function; HVDC monopolar operation; HVDC system; complex soil layer; ground electrode; heterogeneous soil structure; power grid flow; soil surface; substation; transformer neutrals; Conductivity; Electrodes; Green´s function methods; HVDC transmission; Ocean temperature; Power generation; Sea surface; Soil; Substations; Transformers; Earthing; Electrode; Grounding; HVDC Systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Engineering Society General Meeting, 2007. IEEE

Conference_Location

Tampa, FL

ISSN

1932-5517

Print_ISBN

1-4244-1296-X

Electronic_ISBN

1932-5517

Type

conf

DOI

10.1109/PES.2007.385516

Filename

4275398