Electrical Transmission and Substation Structures 2022
Strain Bus Short Circuit Force Background, Accuracy, and Design Impacts
Publication: Electrical Transmission and Substation Structures 2022: Innovating for Critical Global Infrastructure
ABSTRACT
Electrical faults can generate significant electromagnetic forces on substation strain bus conductors resulting in large forces on supporting structures. Simplified calculations from the relevant IEEE standard are typically used to determine these forces; however, the forces are often so large that they are thought to be unrealistic. This paper/presentation summarizes research into standards and papers on electromagnetic fault forces, load application to strain bus, and resulting loads on structures. Errors in the relevant standard are identified and some differences are highlighted between standards used in the United States and used internationally. Design examples are prepared to illustrate the effects of these errors and differences. Comparisons between simplified methods and historical test data are discussed. Comparisons to testing show that simplified methods are accurate assuming the actual fault parameters match the design parameters. Cost impacts of considering short circuit forces on strain bus are presented as well as cost differences between methods in domestic and international standards. Recommendations are given regarding design for short circuit forces on strain bus. This research can have immediate impacts on design considerations.
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Published In
Electrical Transmission and Substation Structures 2022: Innovating for Critical Global Infrastructure
Pages: 548 - 566
Editor: Tim Cashman
ISBN (Online): 978-0-7844-8446-3
Copyright
© 2022 American Society of Civil Engineers.
History
Published online: Sep 20, 2022
Published in print: Sep 20, 2022
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