Electrical Transmission and Substation Structures 2009: by Marlon W. Vogt, P.E., editor

By Marlon W. Vogt, P.E., editor

This court cases comprises forty five papers provided on the 2009 electric Transmisson and Stubstations buildings convention, held in citadel worthy, Texas, on November 8-12, 2009. the aim of the convention used to be to supply additional figuring out of the electrical application via technical papers, workshops, plant excursions, and networking between software execs.

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Extra resources for Electrical Transmission and Substation Structures 2009: Technology for the Next Generation

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Based on a sensitivity study, twenty cable elements were selected for each span. 27 Electrical Transmission and Substation Structures Conference 2009 © ASCE Intact System (Broken Conductor, No Tower Failure) The model developed in the previous section is used to study the effects of the loss of a phase conductor or their combinations on the intact towers (Figure 6a). The ADINA model predicted that the longitudinal force on each tower decreases as the towers are located farther from the failure location.

In theory, this would be an iterative process as the line would need to be redesigned with the actual Ruling Span calculated after the initial spotting, which would end up with a different 40 Electrical Transmission and Substation Structures Conference 2009 © ASCE spotting and another different ruling span, and this would occur differently for each Ruling Span section of a line. In the days before templates could easily be made with software and a local print shop, many engineers would simply say “close enough” within some certain range of the actual Ruling Span and the one used for spotting.

This translates into a much more constrained range to just under 4% allowance for error in our 1000 foot Actual Ruling Span, or 960 feet to 1040 feet Design Ruling Span. 5 -2 Design Ruling Span Error to Actual Ruling Span 500 600 700 800 900 1100 1200 1300 1400 1500 1000 Figure 3. Dimensional Ruling Span Error Relationship. Shorter spans have a greater percentage of error allowed to maintain the same absolute clearance, but the spans are shorter, and conversely, longer spans have a lesser percentage of error allowed to maintain the same absolute clearance.

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