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TCLEE Electrical Power and Communications Lifelines Committee

 
Electrical Power and Communications Lifelines 

PURPOSE: to use the performance of power and communication systems to earthquakes to develop equipment design guidelines, promulgate good facility design practices, and develop emergency operation procedures for power and communication systems to improve their earthquake performance through the reduction of damage and other activities that results in improved post-earthquake response. 

For additional information contact the chairperson: Anshel Schiff at - schiff@stanford.edu

CURRENT ACTIVITIES:

Guide for the Selection, Installation, and Use of Raised Computer Floors

The committee is developing a seismic guide for raised computer floors. The guide will include a description of various design features of raised floor systems, review shake-table test results of raised floors, review earthquake performance of raised floor systems, and identify features that appear to contribute to good seismic performance. Guidance will be provided for selecting raised floors, anchorage and restraint of equipment on raised floors, and retrofitting of raised floors.
You can participate by serving as a reviewer, providing information about past earthquake performance of raised floors, or contribute to the writing of the document.


Seismic Guide for Energy Control and Emergency Response Centers
The document will provide guidance for the design and installation of control rooms and emergency response centers. Issues to be addressed are emergency power, equipment anchorage, non-structural details that would effect operations, such as suspended ceiling, and alternate centers. This information could also be applied to the telecommunications industry and similar facilities used by other lifeline organizations and financial institutions.
You can participate by serving as a reviewer or contribute to the writing of the document.


Topics of Interest to Power System Personnel

1 Earthquake records from the recent Baja, Mexico, and Maipu, Chile, earthquakes indicated that long duration records generate response spectra that are relatively high compared to the peak acceleration. This suggests that when determining the seismic exposure at a site, if the site can be exposed to long duration ground motions, the effective peak acceleration of the site should be increased slightly. This would only affect sites ranked as having moderate exposure if the peak acceleration was close to the 0.5g level.

2 A series of shake-table tests of high-voltage transformer bushings using stiff and flexible support structures have been used to help formulate a new procedure to qualify transformers and their bushings using IEEE 693.

3 Finite element analysis of transformer using construction drawings have been developed by a commercial modeler and then analyzed further by a university to help in the development of the new IEEE 693 qualification procedure for transformers and their bushings.

4 Recent large earthquakes in Baja, Mexico, and Maipu, Chile have resulted in only slight power system damage in which power was restored quickly. Both earthquakes did cause a disproportionate number of transformer bushing failures. Abstracts of these earthquake investigations should appear soon on the web page of the TCLEE Earthquake investigations committee.