Geophysical and geological pre-investigations for HVDC-electrodes

Thunehed, Hans; Astrom, U.; Westman, Bo

doi:10.1109/pesafr.2007.4498123

Cited by 8 publications

(4 citation statements)

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“…Since current between ground electrodes passes through the Ground/Sea Return with Electrode Systems for HVDC Transmission M. Marzinotto*, G. Mazzanti** and M. Nervi*** soil, an accurate knowledge of the following electrical and thermal properties of the soil is needed for a proper design. 1) Resistivity: the earth core consists of low resistivity hot molten magma, but most ground current flows in the earth crust, whose resistivity is the most important factor to consider when locating and designing a ground electrode [8].…”

Section: A Properties Of the Soilmentioning

confidence: 99%

Ground/sea return with electrode systems for HVDC transmission

Marzinotto

Mazzanti

Nervi³

2018

International Journal of Electrical Power & Energy Systems

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Section: A Properties Of the Soilmentioning

confidence: 99%

Ground/sea return with electrode systems for HVDC transmission

Marzinotto

Mazzanti

Nervi³

2018

International Journal of Electrical Power & Energy Systems

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“…The site selection surveys shall be carried out within a radius of some tens of kilometers around the converter substations at the two ends of the HVDC line. The best site at each end is the one with the geoelectric structure that presents the lowest resistivities from the soil surface down to at least mid-crust [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Electrode resistance is an essential performance parameter that is successively calculated during the design process, as more geophysical data are acquired, but is only well-defined after the processing of the commissioning data [5][6][7][8]. The main objective of the paper is the presentation of the methodology for the evaluation of the electrode resistance.…”

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confidence: 99%

Rio Madeira HVDC System: Commissioning of the Ground Electrode for Bipole 2 at Porto Velho

Freire¹,

Kalife

Oliveira

2022

Applied Sciences

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The original ground electrode of the Madeira River HVDC transmission system, bipole 2, was discarded due to the risk of saturation of the transformers in the Converter Substation of Porto Velho, located 15 km away, during the monopolar operation with ground return. After an extensive geophysical survey, a new site was selected, 40 km from the converter substation. For the confirmation of the new site, it was built in the central area of the site, a single-well 47 m deep test electrode, interconnected to the original 15 km electrode line by an additional 40 km long temporary line. A new electrode was then designed. This paper summarizes the test electrode procedure and the activities developed for the new electrode commissioning after its construction, which can be divided into two phases–pre-commissioning and commissioning. The electrode pre-commissioning was performed before its energization for the evaluation of the integrity of its components. The commissioning tests started with electrode energization, employing the electrode line, and an unbalanced bipole operation, which allowed the evaluation of its electrical performance. However, the main objective of the paper is the evaluation of the electrode resistance, which is an essential HVDC electrode parameter.

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“…For a proper design, the site selected for the ground electrode should allow current penetration relatively deep into the earth. Therefore, it is important to obtain information about the resistivity structure of the subsurface close to the electrode and also on a regional scale [1,2].…”

Section: Introductionmentioning

confidence: 99%

Application of Geo-electrical Method in Preliminary Study for Earth Electrode Site Selection

Sumintadireja

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Electrical power transmission is usually done as high voltage transmission for efficiency. For that purpose, effective grounding is necessary especially at the location of the power transmission control center. To obtain a good connection to the ground, very conductive or low resistivity soil should be present up to an appropriate depth at the earth electrode site. In this paper we present the results of the geoelectrical survey performed in a candidate site in the southern part of South Sumatra province, Indonesia. The objective of this preliminary study is to delineate the most appropriate location for the grounding electrodes. Data acquisition for 2D resistivity tomography was done along several lines crossing the survey area. Low resistivity layer of 10 Ohm.m or less up to 50 m depth was found at the north-western sector of the area.

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Geophysical and geological pre-investigations for HVDC-electrodes

Cited by 8 publications

References 0 publications

Ground/sea return with electrode systems for HVDC transmission

Ground/sea return with electrode systems for HVDC transmission

Rio Madeira HVDC System: Commissioning of the Ground Electrode for Bipole 2 at Porto Velho

Application of Geo-electrical Method in Preliminary Study for Earth Electrode Site Selection

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