Longitudinal load and cascading failure risk assessment (CASE): Bonneville Power Administration`s 230/500-kV Longview-Olympia transmission line. Final report
- Energy Delivery and Utilization Center, Haslet, TX (United States)
The Electric Power Research Institute`s (EPRI) Cascading Failure Risk Assessment (CASE) methodology was used to determine extreme event, unbalanced loads on Bonneville Power Administration`s (BPA) 230/500-kV, single circuit, Longview-Olympia transmission line and to identify the cascading potential of the line under five different loading conditions. More specifically, BPA wanted to evaluate the cascading potential of the Type 2L, Type 2A1, and Type 238M tangent structures which comprise a significant portion of the line. While other cascading assessment methods primarily focus on the magnitude of the unbalanced loads acting on the first structure from the initiating event, EPRI`s CASE method incorporates the dynamic response and damping characteristics of the transmission line to determine the unbalanced longitudinal loads at any structure away from the initiating failure event. The CASE application constituted an investigation into the nature of the extreme loads that are expected to occur on the 230/500-kV Longview-Olympia transmission line during a cascading failure and the corresponding dynamic response. The goals of the investigation were: to quantify unbalanced longitudinal loads acting on structures adjacent to the broken insulator, shield wire, or conductor failure as well as down-line structures; and to assess the cascading potential of the Longview-Olympia transmission line by considering the energy dissipation at successive spans and supports. The results of the CASE method showed that BPA`s longitudinal loading criteria for the Type 2L, 2A1, and 238 M lattice towers satisfy BPA`s containment failure design philosophy with the addition of fiber optic cable. BPA`s longitudinal loading criteria applied simultaneously with extreme ice or wind does not provide adequate strength to prevent a cascade of less than ten towers.
- Research Organization:
- Electric Power Research Inst. (EPRI), Palo Alto, CA (United States); Energy Delivery and Utilization Center, Haslet, TX (United States)
- Sponsoring Organization:
- Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 355069
- Report Number(s):
- EPRI-TR-111660; TRN: AHC29924%%275
- Resource Relation:
- Other Information: PBD: Dec 1998
- Country of Publication:
- United States
- Language:
- English
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