ABSTRACT
Transmission line reliability is a greater concern than for distribution lines, since transmission substations typically serve as the source for delivering power to the subtransmission and/or distribution system from a variety of resources. As the demand for, and societal dependence upon, electricity has grown, so too have the complexities of maintaining ever-growing transmission and distribution systems. Transmission reliability concerns have been integral to power system planning since the inception of the lines themselves. Factors such as design, weather performance, common mode outages, and outage performance of lines are key facets of the overall design and specification of electrical systems. WECC transmission totals, momentary outage summary, sustained outage summary, outages per month, sustained transformer outage rate, transformer age summary, outage rate per bank by transformer age, outage rate of common corridor and common tower, outage rate per each physical attribute, voltage level outage cause code.
