IEEE 1366-2003 pdf download IEEE Guide for Electric Power Distribution Reliability Indices
Definitions are given here to aid the user in understanding the factors that affect index calculation. Many ofthese definitions were taken directly from The Authoritative Dictionary of EEE Standards Terms, 7thEdition (B913. lf there is a conflict between the definitions in this document and the dictionary, thedefinitions in this document take precedence. Others are given because they have a new interpretation withinthis document or have not been previously defined.
3.1 connected load: Connected transformer kVA, peak load, or metered demand (to be clearly specifiedwhen reporting) on the circuit or portion of circuit that is interrupted. When reporting, the report should statewhether it is based on an annual peak or on a reporting period peak.
3.2 customer : A metered electrical service point for which an active bill account is established at a specificocation (e.g, premise).
3.3 customer count: The number of customers either served or interrupted depending on usage
3.4 distribution system: That portion of an electric system that delivers electric energy from transformationpoi nts on the transmission system to the customer
NOTE–The distribution system is generally considered to be anything from the distribution substation fence to thecustomer meter. Often the initial overcurrent protection and voltage regulators are within the substation fence and areconsidered to be part of the distri bution systerm.
3.5 forced outa ge: The state of a component when it is not avalable to perform its intended functi on due toan unplanned event directly associated with that component.
3.6 interrupting device: An interrupting device is adevice whose purposeis to interrupt the flow of powerusually in response to a fault. Restoration of service or disconnection of loads can be accomplished bymanual, automatic,or motor-perated methods. Examples include transmission circuit breakers, feedercircuit breakers, line red osers, line fuses, sectionalizers, motor-operated switches or others.
37 interruption: The loss of service to one or more customers connected to the distribution portion of thesystem. It is the result of one or more component outages, depending on system configuration. See also:outage
3.8 inter ruption dur ation: The time period from theinitiation of an interruption to a customer until servicehas been restored to that customer. The process of restoration may require restoring service to small sectionsof the system (see 5.3.2) until service has been restored to all customers. Each of these individual stepsshould be tracked collecting the start time, end time and number of customers interrupted for each step.
3.9 interruptions caused by events outside of the distribution system: Outages that occur on generation.transmission, substations, or customer facilities that result in the interruption of service to one or morecustomers. While generally a small portion of the number of interruption events, these interruptions canaffect alarge number of customers and last for an exceedingly long duration.
3.10 lock out: Refers to the final operation of a recloser or circuit breaker in an attempt to isolate apersistentfault,or to the state where all automatic reclosing has stopped. The current-carrying contacts of theovercurrent protecting device are locked open under these conditions.
3.11 loss of ser vice: A complete oss of voltage on at least one normally energized conductor to one or morecustomers. This does not include any of the power quality issues such as: sags, swells, impulses,orharmonics.
IEEE 1366-2003 pdf download
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