T&D World Magazine
Structures supplement WRK Engineers Inc

An SAP2000 computer model of Imperial Valley substation was used to seismically strengthen the substation’s bays.

Seismically Sound Substation Structures

A major earthquake revealed the need for a 500-kV substation’s bus work to be flexible to minimize seismic damage.

On April 4, 2010, an earthquake with a magnitude of 7.2 occurred in northern Mexico and was felt as far away as Los Angeles, California, U.S. The earthquake caused significant damage to the 500-kV yard of the San Diego Gas & Electric Co. (SDG&E) Imperial Valley substation. Damage to substations can have significant economic impacts on a utility and its customers. Recognizing these impacts, SDG&E developed a post-earthquake mitigation plan involving a detailed study of the flex

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