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TitleAC interference on pipelines in southern Sweden
AuthorBoteler, D H; Malmborn, K; Edwall, H -E
SourceProceedings of CEOCOR Conference; 2013-17, 2013 p. 1-12
Alt SeriesEarth Sciences Sector, Contribution Series 20130387
MeetingProceedings of Ceocor Conference; Florence; IT; June 4-7, 2013
Mediaon-line; digital
File formatpdf
Subjectsgeophysics; engineering geology; pipelines; pipeline feasibility studies; currents; electrical properties
Illustrationslocation maps; photographs; profiles
ProgramTargeted Hazard Assessments in Northern Canada, Public Safety Geoscience
AbstractAC Interference on a section of pipeline in southern Sweden was measured in February 2011 and October 2012. The measurements were made with fast sample dataloggers with GPS timing that allowed the waveform and time of pipe-to-soil potential variations to be captured. These show that the AC interference were out of phase at opposite ends of the pipeline section. The recorded waveforms were not simple sinusoids but had considerable distortion. Spectral analysis showed, as well as the AC fundamental (50 Hz), there were significant components at the 3rd (150 Hz) and 7th (350 Hz) harmonics, as well as the 4th (200 Hz) and 8th (400 Hz) harmonics. Odd harmonics frequently occur on a power system. However, even harmonics do not usually occur but are produced by the AC/DC converter on a nearby DC cable. AC ground beds are used to reduce 50 Hz and will normally also reduce higher frequencies.
Summary(Plain Language Summary, not published)
Space weather refers to the dynamic conditions on the Sun and in the space environment, in particular, in the near-Earth environment, that can affect critical infrastructure. NRCan operates the Canadian Space Weather Forecast Centre and conducts research into space weather effects on power systems, pipelines, radio communications and GNSS positioning to help Canadian industry understand and mitigate the effects of space weather. This paper examines the process of electromagnetic induction in pipelines. This can be used to understand how geomagnetic disturbances produce voltages in pipelines so that the appropriate mitigation measures can be applied.