Longitudinal load and cascading failure risk assessment (CASE): Tennessee Valley Authority`s 161-kV Lowndes-West Point transmission line. Final report
- J.A. Jones Power Delivery, Inc., 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 Tennessee Valley Authority`s (TVA) 161-kV, single circuit, Lowndes-West Point transmission line and to identify the cascading potential of the line under five different loading conditions. More specifically, TVA wanted to evaluate the cascading potential of the Type HS-1G and BHS-1G tangent structures which comprise the majority 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 161-kV Lowndes-West Point 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; to assess the cascading potential of the Lowndes-West Point transmission line by considering the energy dissipation at successive spans and supports. The results of the CASE method indicate that the lack of longitudinal strength of the Type HS-1G and BHS-1G steel pole H-frame coupled with the dynamic characteristics of the Lowndes-West Point line was likely to result in a cascading failure for the more severe initiating event and load case combinations.
- Research Organization:
- Electric Power Research Inst. (EPRI), Palo Alto, CA (United States); J.A. Jones Power Delivery, Inc., Haslet, TX (United States)
- Sponsoring Organization:
- Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 354855
- Report Number(s):
- EPRI-TR-108479; TRN: AHC29924%%59
- Resource Relation:
- Other Information: PBD: Mar 1998
- Country of Publication:
- United States
- Language:
- English
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