Beware of high stresses in ``A`` frame supported two-level bus structures
- Gilbert Commonwealth Inc., Reading, PA (United States)
Rigid-bus structures in many low profile, high voltage transmission substations consist of two-level bus assemblies of tubular conductors with one bus assembly supporting the other bus assembly with rigid tubular ``A`` frames at the crossover points. The lower-level bus is normally supported by a single porcelain post insulator under the ``A`` frame. Rigid ``A`` frames not only support the upper-level bus assembly, but also make the electrical connections between the two buses. This paper addresses the stress problem in the lower-level bus of the two-level bus structure. It presents the results of the structural analysis of a sample two-level bus structure using a simple structural method based on the Three Moment Theorem and equilibrium equations. A spreadsheet template is used to perform the mathematical calculations. The spreadsheet first calculates the maximum allowable bus span length in accordance with the IEEE Standard 605 and then determines the internal stress on the upper and lower-level bus conductors in the two-level rigid bus structures.
- OSTI ID:
- 103670
- Report Number(s):
- CONF-950414-; TRN: IM9541%%109
- Resource Relation:
- Conference: 57. annual American power conference, Chicago, IL (United States), 18-20 Apr 1995; Other Information: PBD: 1995; Related Information: Is Part Of American Power Conference: Proceedings. Volume 57-II; PB: 914 p.
- Country of Publication:
- United States
- Language:
- English
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