Geomagnetically induced pipe-to-soil voltages in the Czech oil pipelines during October-November 2003

Hejda, Pavel; Bochníček, Josef

doi:10.5194/angeo-23-3089-2005

Cited by 43 publications

(41 citation statements)

References 12 publications

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“…Note that at lower latitudes where the source field is more uniform, the "vicinity" can cover larger distances (e.g. Koen, 2002;Hejda and Bochnicek, 2005). One then sets a baseline for the response of the system to a given geoelectric field, i.e.…”

Section: Discussionmentioning

confidence: 99%

Determination of ground conductivity and system parameters for optimal modeling of geomagnetically induced current flow in technological systems

2007

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In this work, methods to determine technological system parameters and the ground conductivity structure from different sets of geomagnetically induced current (GIC), magnetic field and geoelectric field observations are explored. The goal of the work is to enable optimal modeling of induced currents in any technological system experiencing GIC. As an additional product, the introduced methods can also be applied to utilize GIC observations in the imaging of the subsurface geological structures. Here a robust processing scheme and Occam's inversion technique familiar from magnetotelluric (MT) studies are applied to the determination of the ground conductivity structure. The application of the methods to GIC data from the Finnish pipeline for a storm period of October 24-November 1, 2003 demonstrate that optimal system parameters and ground conductivity structure can be obtained using time series comprising only 8 days worth of data. Importantly, the obtained ground model is in agreement with models obtained in earlier MT studies. Furthermore, it is shown that although in an ideal case the magnetic field data used should be obtained from the immediate vicinity of the GIC observation site, some spatial separation (200-300 km) between the sites can be tolerated.

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Section: Discussionmentioning

confidence: 99%

Determination of ground conductivity and system parameters for optimal modeling of geomagnetically induced current flow in technological systems

2007

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“…Kappenman [2005] argued that the source of sustained GICs at low and middle latitudes are linked with high rates of variation associated with impulsive increases in the solar wind dynamic pressure or ring current intensifications. These facts have encouraged several research groups and agencies to initiate vulnerability assessment studies on power grids or pipelines located at regions previously considered to have low GIC-risk other than South Africa, such as China [Liu et al, 2009], Japan [Watari et al, 2009], Czech Republic [Hejda and Bochníček, 2005], Kazakhstan [Vodyannikov et al, 2006], Australia [Marshall et al, 2011] or Brasil [Trivedi et al, 2007]. We were similarly motivated to perform such an analysis in a power grid of northeastern Spain, where we are settled.…”

Section: Introductionmentioning

confidence: 99%

Geomagnetically induced currents in a power grid of northeastern Spain

et al. 2012

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[1] Using the geomagnetic records of Ebro geomagnetic observatory and taking the plane wave assumption for the external current source and a homogeneous Earth conductivity, a prediction of the effects of the geomagnetic activity on the Catalonian (northeastern Spain) power transmission system has been developed. Although the area is located at midlatitudes, determination of the geoelectric field on the occasion of the largest geomagnetic storms during the last solar cycles indicates amplitudes that are higher than those recorded in southern Africa, where some transformer failures on large transmission systems have been reported. A DC network model of the grid has been constructed, and the geomagnetically induced current (GIC) flows in the power network have been calculated for such extreme events using the electric field at Ebro as a regional proxy. In addition, GICs have been measured at one transformer neutral earthing of the power grid, so that there the accuracy of the model has been assessed. Although the agreement is quite satisfactory, results indicate that better knowledge of the ground conductivity structure is needed. This represents the first attempt to study and measure GICs in southern European power grids, a region considered to have low GIC-risk up to the present.

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“…[19] Determination of the geoelectric field from the geomagnetic field data have been performed in both the time domain [Pirjola, 2002;Hejda and Bochnicek, 2005] and the frequency domain [Pirjola, 1982[Pirjola, , 2002Trichtchenko and Boteler, 2002]. In the frequency domain, the simplest model assumes the Earth is a uniformly conducting half-space and the magnetic source field can be represented by a vertically downward propagating plane wave.…”

Section: Discussion and Modelingmentioning

confidence: 99%

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2010

Space Weather Quarterly

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Geomagnetically induced pipe-to-soil voltages in the Czech oil pipelines during October-November 2003

Cited by 43 publications

References 12 publications

Determination of ground conductivity and system parameters for optimal modeling of geomagnetically induced current flow in technological systems

Determination of ground conductivity and system parameters for optimal modeling of geomagnetically induced current flow in technological systems

Geomagnetically induced currents in a power grid of northeastern Spain

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