Western Electricity Coordinating Council experience in the collection of transmission common-mode and dependent outages

This paper discusses the Western Electricity Coordinating Council's (WECC) experience in the collection of transmission outage data with an emphasis on common-mode and dependent outage events, and is a result of ongoing research carried out by the WECC Reliability Performance Evaluation Working Group (RPEWG). The outage data statistics of WECC 230-, 345-, and 500-kV transmission lines constructed on the same tower as well as those constructed in the same-right-of-way have been analyzed in detail.