High-voltage equipment representing a tall and slender system is quite common. Capacitor racks and valve towers are common examples of such equipment. A representative example of such equipment is analyzed in this paper. Due to electrical isolation purposes, this type of equipment is usually comprised of brittle porcelain insulators or polymer insulators with low damping. The insulators are used as columns, main load carrying elements. The system is relatively tall and slender. Because of the large masses installed at various elevations of the system and the narrow footprint in one of the horizontal directions, the system has a relatively low resonant frequency. Seismic protection of such systems with a potentially large overturning moment and low resonant frequency is quite challenging. For example, a regular seismic isolation has limited use. To improve the seismic performance of the system, friction dampers are introduced into the system. The friction dampers are studied extensively in full-scale component tests, as it is required by the current draft of the IEEE693 document. The results of component tests are used in the development of a numerical finite element model, which is subjected to an IEEE693-spectrum compatible strong motion to evaluate the seismic performance of the seismically protected system.
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