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| Titel |
Wet snow hazard for power lines: a forecast and alert system applied in Italy |
| VerfasserIn |
P. Bonelli, M. Lacavalla, P. Marcacci, G. Mariani, G. Stella |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 11, no. 9 ; Nr. 11, no. 9 (2011-09-09), S.2419-2431 |
| Datensatznummer |
250009667
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| Publikation (Nr.) |
 copernicus.org/nhess-11-2419-2011.pdf |
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| Zusammenfassung |
Wet snow icing accretion on power lines is a real problem in Italy, causing
failures on high and medium voltage power supplies during the cold season. The
phenomenon is a process in which many large and local scale variables
contribute in a complex way and not completely understood. A numerical weather
forecast can be used to select areas where wet snow accretion has an high
probability of occurring, but a specific accretion model must also be used to
estimate the load of an ice sleeve and its hazard. All the information must be
carefully selected and shown to the electric grid operator in order to warn
him promptly.
The authors describe a prototype of forecast and alert system, WOLF (Wet snow Overload aLert and Forecast), developed and
applied in Italy. The prototype elaborates the output of a numerical weather
prediction model, as temperature, precipitation, wind intensity and
direction, to determine the areas of potential risk for the power lines.
Then an accretion model computes the ice sleeves' load for different
conductor diameters. The highest values are selected and displayed on a
WEB-GIS application principally devoted to the electric operator, but also
to more expert users. Some experimental field campaigns have been conducted
to better parameterize the accretion model. Comparisons between real
accidents and forecasted icing conditions are presented and discussed. |
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