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CAIDI
The Customer Average Interruption Duration Index (CAIDI) is a reliability index commonly used by electric power utilities. It is related to SAIDI and SAIFI The System Average Interruption Frequency Index (SAIFI) is commonly used as a reliability index by electric power utilities. This index measures the average number of times that a system customer experiences an outage during the year or during a g ..., and is calculated as \mbox = \frac where \lambda_i is the failure rate, N_i is the number of customers, and U_i is the annual outage time for location i. In other words, \mbox = \frac = \frac CAIDI gives the average outage duration that any given customer would experience. CAIDI can also be viewed as the average restoration time. CAIDI is measured in units of time, often minutes or hours. It is usually measured over the course of a year, and according to IEEE Standard 1366-1998 the median value for North American utilities is approximately 1.36 hours. References {{DEFAULTS ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reliability Index
Reliability index is an attempt to quantitatively assess the reliability of a system using a single numerical value. The set of reliability indices varies depending on the field of engineering, multiple different indices may be used to characterize a single system. In the simple case of an object that cannot be used or repaired once it fails, a useful index is the mean time to failure representing an expectation of the object's service lifetime. Another cross-disciplinary index is forced outage rate (FOR), a probability that a particular type of a device is out of order. Reliability indices are extensively used in the modern electricity regulation. Power distribution networks For power distribution networks there exists a "bewildering range of reliability indices" that quantify either the duration or the frequency of the power interruptions, some trying to combine both in a single number, a "nearly impossible task". All indices are computed over a defined period, usually a year ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Power
Electric power is the rate of transfer of electrical energy within a electric circuit, circuit. Its SI unit is the watt, the general unit of power (physics), power, defined as one joule per second. Standard prefixes apply to watts as with other SI units: thousands, millions and billions of watts are called kilowatts, megawatts and gigawatts respectively. In common parlance, electric power is the production and delivery of electrical energy, an essential public utility in much of the world. Electric power is usually produced by electric generators, but can also be supplied by sources such as Electric battery, electric batteries. It is usually supplied to businesses and homes (as domestic mains electricity) by the electric power industry through an electrical grid. Electric power can be delivered over long distances by electric power transmission, transmission lines and used for applications such as Electric motor, motion, Electric light, light or Electric heat, heat with high ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Utilities
A public utility company (usually just utility) is an organization that maintains the infrastructure for a public service (often also providing a service using that infrastructure). Public utilities are subject to forms of public control and regulation ranging from local community-based groups to statewide government monopolies. Public utilities are meant to supply goods and services that are considered essential; water, gas, electricity, telephone, waste disposal, and other communication systems represent much of the public utility market. The transmission lines used in the transportation of electricity, or natural gas pipelines, have natural monopoly characteristics. A monopoly can occur when it finds the best way to minimize its costs through economies of scale to the point where other companies cannot compete with it. For example, if many companies are already offering electricity, the additional installation of a power plant will only disadvantage the consumer as price ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iowa State University
Iowa State University of Science and Technology (Iowa State University, Iowa State, or ISU) is a Public university, public land-grant university, land-grant research university in Ames, Iowa, United States. Founded in 1858 as the Iowa Agricultural College and Model Farm, Iowa State became one of the nation's first designated land-grant institutions when the Iowa Legislature accepted the provisions of the 1862 Morrill Land-Grant Colleges Act, Morrill Act on September 11, 1862. On July 4, 1959, the college was officially renamed Iowa State University of Science and Technology. Iowa State is the second largest university in Iowa by total enrollment. The university's academic offerings are administered through eight colleges, including the Iowa State University College of Agriculture and Life Sciences, College of Agriculture and Life Sciences, the Iowa State University College of Veterinary Medicine, College of Veterinary Medicine, the Iowa State University College of Engineering, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SAIDI
A Ṣa‘īdī (, Coptic language, Coptic: ⲣⲉⲙⲣⲏⲥ ''Remris'') is a person from Upper Egypt (, Coptic language, Coptic: ⲙⲁⲣⲏⲥ ''Maris''). Etymology The word literally means "from Ṣa‘īd" (i.e. Upper Egypt), and can also refer to a Music of Egypt#Saidi (Upper Egyptian), form of music originating there, or to Sa'idi Arabic, the dialect spoken by Sa‘idis. The Arabic word ''Ṣa‘īd'', as a geographical term, means "highland, upland, plateau". The suffix ''-i'' forms an adjective. The word ''Ṣa‘īdi'' is pronounced in the dialect itself as or and the plural is or , while pronounced in Egyptian Arabic (Northern Egyptian) as and the plural is . In the Sahidic (Upper Egyptian) dialect of Coptic, the name for a person from Upper Egypt is (pronounced rem/rīs) meaning "person of the South" or (pronounced rem/pma/rīs or rem/ma/rīs) "person of (the) place of the south (i.e. Upper Egypt)". Socioeconomic status Approximately 40% of Egyptians liv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SAIFI
The System Average Interruption Frequency Index (SAIFI) is commonly used as a reliability index by electric power utilities. This index measures the average number of times that a system customer experiences an outage during the year or during a given time period. SAIFI is normally calculated on either yearly or monthly basis. SAIFI is calculated as: \mbox = \frac where \lambda_i is the failure rate and N_i is the number of customers for location i. In other words, \mbox = \frac Many factors cause power interruptions, including weather, vegetation patterns, and utility practices. Utilities can report interruption duration values with major events (such as snowstorms or hurricanes), without major events, or both. SAIFI is measured in units of interruptions per customer. According to IEEE Standard 1366-1998 the median value for North American utilities is approximately 1.10 interruptions per customer. References Sources * {{DEFAULTSORT:Saifi Electric power Reliabili ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Power
Electric power is the rate of transfer of electrical energy within a electric circuit, circuit. Its SI unit is the watt, the general unit of power (physics), power, defined as one joule per second. Standard prefixes apply to watts as with other SI units: thousands, millions and billions of watts are called kilowatts, megawatts and gigawatts respectively. In common parlance, electric power is the production and delivery of electrical energy, an essential public utility in much of the world. Electric power is usually produced by electric generators, but can also be supplied by sources such as Electric battery, electric batteries. It is usually supplied to businesses and homes (as domestic mains electricity) by the electric power industry through an electrical grid. Electric power can be delivered over long distances by electric power transmission, transmission lines and used for applications such as Electric motor, motion, Electric light, light or Electric heat, heat with high ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
