Transmission line vulnerability to lightning over areas of dense rainforests and large rivers in the Amazon region

Autor: Willamy M. Frota, Brígida Ramati Pereira da Rocha, Carlos Simoes Pereira, Arthur da Costa Almeida
Rok vydání: 2015
Předmět:
Zdroj: Electric Power Systems Research. 119:287-292
ISSN: 0378-7796
DOI: 10.1016/j.epsr.2014.10.001
Popis: The vulnerability under lightning conditions of stretches of the 1500 km long electrical transmission line Tucurui–Oriximina–Manaus over dense Amazon forest canopy and river crossings is evaluated using a leader progression model (LPM) called ModSalto . We find vulnerability windows (low protection or unsafe) in all crossing stretches that use high towers to comply with environmental restrictions. The values of lightning flashover rates (LFR) reach 0.8277 flashover/year or an equivalent period of 14.49 months for stretches of river crossings, and 0.3403 flashover/year or an equivalent period of 35.26 months for stretches of forest canopy crossing. These numbers are above the computed equivalent ANEEL bidding figure of 0.15 flashover/year for that TL. This methodology uses a map of yearly lightning frequency produced with data from STARNET and SIPAM LLS and the level of lightning protection was evaluated with the electro-geometric model (EGM).
Databáze: OpenAIRE
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