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Customer Total Average Interruption Duration Index
The Customer Total Average Interruption Duration Index (CTAIDI) is a reliability index associated with electric power distribution. CTAIDI is the average total duration of interruption ''for customers who had at least one interruption during the period of analysis'', and is calculated as: \mbox = \frac where N_i is the number of customers and U_i is the annual outage time for location i, and N_ is the number of customers at location i that were interrupted. In other words, \mbox = \frac CTAIDI is measured in units of time, such as minutes or hours. It is similar to CAIDI, but CAIDI divides the total duration of interruptions by the number of interruptions whereas CTAIDI divides by the number of interrupted customers. When CTAIDI is much greater than CAIDI, the service outages are more concentrated among certain customers. CTAIDI also has the same numerator as SAIDI A Ṣa‘īdī (, Coptic: ⲣⲉⲙⲣⲏⲥ ''Remris'') is a person from Upper Egypt (, Coptic: ⲙⲁ ... [...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". Popular indices are typically customer-oriented, some come in p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Power Distribution
Electric power distribution is the final stage in the delivery of electric power; it carries electricity from the transmission system to individual consumers. Distribution substations connect to the transmission system and lower the transmission voltage to medium voltage ranging between and with the use of transformers. ''Primary'' distribution lines carry this medium voltage power to distribution transformers located near the customer's premises. Distribution transformers again lower the voltage to the utilization voltage used by lighting, industrial equipment and household appliances. Often several customers are supplied from one transformer through ''secondary'' distribution lines. Commercial and residential customers are connected to the secondary distribution lines through service drops. Customers demanding a much larger amount of power may be connected directly to the primary distribution level or the subtransmission level. The transition from transmission to distribu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 Muslim Saifi, or sometimes pronounced Barhai are Muslim community, found in North India. They are also known as Saifi which denotes the Muslim sub-caste of blacksmiths and carpenters. A small number are also found in the Terai region of Nepa ..., 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 {{DEFAULTSO ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SAIDI
A Ṣa‘īdī (, Coptic: ⲣⲉⲙⲣⲏⲥ ''Remris'') is a person from Upper Egypt (, Coptic: ⲙⲁⲣⲏⲥ ''Maris''). Etymology The word literally means "from Ṣa‘īd" (i.e. Upper Egypt), and can also refer to a form of music originating there, or to the dialect spoken by Sa‘idis. The Arabic word ''Ṣa‘īd'', as a geographical term, means "highland, upland, plateau". The suffix "-i" denotes the 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)". Stereotypes and jokes Ṣa‘īdis and their dialect are the subject of numerous Egyptian stereotypes and ethnic jokes, mainly from the uppe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Power
Electric power is the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, 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. A common misconception is that electric power is bought and sold, but actually electrical energy is bought and sold. For example, electricity is sold to consumers in kilowatt-hours (kilowatts multiplied by hours), because energy is power multiplied by time. Electric power is usually produced by electric generators, but can also be supplied by sources such as 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 transmission lines and used for applications such as motion, light or heat with high efficiency. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
