Journal of Power and Energy Engineering, 2015, 3, 332-341
Published Online April 2015 in SciRes. http://www.scirp.org/journal/jpee
http://dx.doi.org/10.4236/jpee.2015.34045
How to cite this paper: Gong, Y., et al. (2015) Advanced Analysis of HVDC Electrodes Interference on Neighboring Pipelines.
Journal of Power and Energy Engineering, 3, 332-341. http://dx.doi.org/10.4236/jpee.2015.34045
Advanced Analysis of HVDC Electrodes
Interference on Neighboring Pipelines
Yu Gong1, Chunlin Xue2, Zhilei Yuan2, Yexu Li3, Farid Paul Dawalibi3
1China Southern Power Grid, Guangzhou, China
2Huadong Power Design Institute, Shanghai, China
3Safe Engineering Services & Technologies ltd., Laval, Quebec, Canada
Email: yexu.li@sestech.com, info@seschina.cn
Received February 2015
Abstract
This paper focuses on adv anc ed analysis techniques and design considerations of DC interference
generated by HVDC electr odes during normal bipolar and temporary monopolar operations on
neighboring metallic utilities, with a special emphasis on bur ied gas and oil pipelines. This study
examines the level of pipeline corr osi on, th e safety status in the vicinity of exposed appurtenances
and the impact of DC interference on the integrity of insulating flanges and impressed current ca-
thodic protection (ICCP) systems. Computation results obtained for different soil models show
that different soils can lead to completely different DC interference effects. The results and con-
clusions presented here can be used as a reference to analyze the severity of DC interference on
pipelines due to proximate HVDC electrodes .
Keywords
HVDC Electrode, DC Interference, P ipe-to-Soil Potential, Polarization Potential, Insulating Joint
(Flanges), Rectifier, Touch Voltage, Corrosion, Safety, Impressed Current Cathodic Protection
1. Introduction
HVDC networks have been widely implemented in China in recent years. HVDC has proved to be well suited to
specific applications, including long-distance power transmission, relatively long cable interconnections, inter-
connections between large isolated HVAC systems, and asynchronous tie-lines between HVAC systems. During
normal bipolar operations and particularly during temporary monopolar operations of the HVDC lines, DC cur-
rents injected into the soil result in an electric field that can introduc e excessive currents and voltages in nearby
metallic utilities, such as pipelines. Consequently, such current can cause or accelerate DC corrosion, damage
rectifiers and insulating flanges or joints and can threaten the safety of per s onne l working at valve and test sta-
tions as well as along the pipe. Due to the significant increase of HVDC systems, the con cerns on their possible
adverse impact on the environment have accelerated the need for accurate approaches to analyze HVDC adverse
effects on neighb ori ng buried metallic utilities and development of appropriate effective and economical mitiga-
tion measures.
This paper discusses recent advances and new developments achieved in the analysis of electromagnetic in-