By H Lee Willis; Randall R Schrieber; Gregory V Welch
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This is called "N-l" planning, or use of the N-l criterion. Any one element of the power system, composed of N elements, can be removed, and the system will still perform its job, even under the most stressful (peak) conditions. Simply stated, one bought reliability with capacity N-l engineering is done by running N separate studies of a power system, one in which each of the N elements is removed (outaged) and the system switched as appropriate to have other equipment pick up the load it was serving.
Copyright © 2001 by Taylor & Francis Group, LLC 24 Chapter 1 Additional factors include switching zone and contingency backup policy, voltage regulation and 'reach" design, and conductor set selection and tapering policy. Any reasonable layout style, conductor size set, switching zone, and conductor sizing rule base, will result in a distribution system that does its basic job as interpreted from the traditional perspective: route power from substations to customers without violation of voltage, loading, or power factor standards.
Whether marketed by a local utility, load aggregator, or direct power retailer, this electric power must flow through a power delivery system on its way from power production to consumer. This transmission and distribution (T&D) system consists of thousands of transmission and distribution lines, substations, transformers, and other equipment scattered over a wide geographical area and interconnected so that all function in concert to deliver power as needed to the utility's consumers. This chapter is a quick tutorial review on T&D systems, their mission, characteristics, and design constraints.