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Definition of "Reliability" |
Electric system reliability has two components - adequacy and security. Adequacy is the ability of the electric system to supply the aggregate electric demand and energy requirements of the consumers at all times, taking into account scheduled and unscheduled outages of system facilities. Security is the ability of the electric system to withstand sudden disturbances such as electric short circuits or unanticipated loss of system facilities. / The ability of an item to perform a required function under stated conditions for a specified period of time. The probability that a functional unit will perform its required function for a specified interval under stated conditions.The probability of a part performing its specified purpose for the period intended under the operating conditions encountered, expressed as failure rate. Also refer to MTBF. / The guarantee of system performance at all times and under all reasonable conditions to assure constancy, quality, adequacy and economy of electricity. It is also the assurance of a continuous supply of electricity for customers at the proper voltage and frequency. / Reliability is an attribute of any computer-related component (software, or hardware, or a network, for example) that consistently performs according to its specifications. It has long been considered one of three related attributes that must be considered when making, buying, or using a computer product or component. Reliability, availability, and serviceability RAS) for short - are considered to be important aspects to design into any system. In theory, a reliable product is totally free of technical errors, in practice, however, vendors frequently express a product's reliability quotient as a percentage. Evolutionary products (those that have evolved through numerous versions over a significant period of time) are usually considered to become increasingly reliable, since it is assumed that bug s have been eliminated in earlier releases. For example, IBM's z/OS (an operating system for their S/390 server series), has a reputation for reliability because it evolved from a long line of earlier MVS and OS/390 operating system versions. / the probability that a component or system will function without failure over a specified time period, under stated conditions. |
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