000011575 001__ 11575
000011575 005__ 20141205155924.0
000011575 04107 $$aeng
000011575 046__ $$k2008-10-12
000011575 100__ $$aSchiff, Anshel J.
000011575 24500 $$aOrientation of Power Equipment in Seismic Qualification Testing

000011575 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000011575 260__ $$b
000011575 506__ $$arestricted
000011575 520__ $$2eng$$aIEEE 693, “IEEE Recommended Practice for Seismic Design of Substations,” is used to seismically qualify electrical power equipment in the United States. It requires equipment operating at or above 161 kV to be seismically qualified by shake-table testing. Input test motions are specified by the Required Response Spectrum (RRS). The response spectra of theoretical shake-table input records are typically within 5% of their target values. The Test Response Spectra (TRS), which are derived from table-mounted accelerometers, are typically within 25% of the RRS. Some power equipment is structurally simple and modes of vibration can be estimated, however, small variations in the method of installation can cause a large change in the mode shape orientation. When equipment is tested it is generally assumed that the modes of vibration are aligned in the directions that the table motions have been optimized. If the actual mode shapes are aligned along different axes, the equipment can be over or under test by as much as 60% when using theoretical analysis and deviations in actual table motions may be larger. Thus, minor changes in the method of installing the equipment on the shake table can cause large variations in the degree of over or under testing. For complex systems the modes of vibration can have different orientation for each mode so that it is not possible to orient the equipment to conform to the directions for which the TRS has been optimized. This demonstrates that even when testing is done correctly qualification results may not meet qualification objectives.

000011575 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000011575 653__ $$atesting, qualification, equipment, orientation 

000011575 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000011575 720__ $$aSchiff, Anshel J.
000011575 8560_ $$ffischerc@itam.cas.cz
000011575 8564_ $$s836292$$uhttps://invenio.itam.cas.cz/record/11575/files/S30-001.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: S30-001.
000011575 962__ $$r9324
000011575 980__ $$aPAPER