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Engelen J.,Uppenkamp und Partner GmbH | Fischer K.,TECUM GmbH | Hettig C.,Kurz und Fischer GmbH Beratende Ingenieure | Krapf K.-G.,Wolfel Beratende Ingenieure GmbH I Co KG | And 7 more authors.

Audible noise by electrical discharges on extra-high-voltage (EHV) overhead lines, so-called corona noise, occurs due to wet or humid weather conditions. The highest values are achieved during precipitation. It is a challenging task to determine the relevant noise levels in individual cases and to assess them according to the German noise regulation "TA Lärm" and its accompanying set of rules, due to the enormous variation of the potential noise levels, while also considering the rather rare conditions for the occurrence. Since of the recent turnaround in German energy policy, which necessitates an accelerated expansion of the EHV grid, authorities are required to make decisions both quickly and in a well-justified way. However there are hardly any practical guidelines for the line-noise issue. This article describes the phenomenon of audible noise generation on EHV overhead line conductors based on recent scientific evidence. The procedures for measurements are explained in the context of various long-term investigations on site, and their results are presented. An appropriate evaluation of line noise immissions, according to the given regulatory framework, will also be suggested. Source

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