IEEE 859-2018 pdf free download – IEEE Standard Terms for Reporting and Analyzing Outage Occurrences and Outage States of Electrical Transmission Facilities.
In ecoera lacomponent-bacsxl vstcm ot out alw data collection icr a syski will be ba.cd on an inventory ot components (the population’] which i’. intended to be exhaustive: every relevant portion of the systeni is a part of oneand only one component. A comprehensive inventory dsuhcomponcoksnot usually dn’dod aithough … inventory ofa particular -. of suhcomponents may be S’s-eloped to support a particular study l’crtormance indices such as systematically cakulatixi for all components in the rein-ant population but are tardy calculated for .iubcompunents. Examples include line sisznirnts. towers and buses niiyht be subeompunents of a line salion: bushing. tank. and wmdzng might be subcornponcnh of a wan slormer
3.21 Line segment A portion ola line section that has a particular tvyl2of construction or isesposed to a particular type of failure and therefore which may be regarded as a single entity for the purpose of reporting and analyzing failure and esposurt data. NOTE —A line segment is a subwmponent of a line section.
3.3 Unit A group of components 1h4,,ivhwh are functionally related and are regarded as an entity for purposes of recording and analyzing data on outage occurrences. NOTF 1—A unit can be defined in a number of ways. For example, it may bc’ (1) A group of components that wlsielt constitute an operating entity bounded by automatic fault interrupting devices which isolate it from other such entities for faults on any component within the groupc (2) A group of components protected by and within the sensing zone of a particular system of protective relays. Examples include a transformer or an overhead line and associated terminal facilities switched with it; (3) Agroup olcumponents including a transrrcssion line. oncor nswi’transIormeni supplied by the line, and a subtransmisslon or distribution network radially supplied from the transformer These components are so conñgu red that the sub transmission network is in the outage state during outage occurrences of the transmission line.
NOTE 2—A unit may be single-terminal, two-terminator multi-terminal A multi-terminal unit is connected to three or more terminaLs.
NOTE 3—li is recognized that certain components (for example. nraiit breakers) may be part of mute than one unit.
NOTE 4—L)iffrrmt tpes of units include transmission unit (overhrad or cable). transformer unit, bus unit, and special units that consist of any equipment protected by sqarate brakes. such as shunt capacitors.
3.4 Terminal
A kinctional facility (substation. generating station, or load center) which includes components such as bus sections circuit breakers, and protection systems where transmssicsn units terminate.
4. Component and unit states and events
Except as noted, the terms in this sectbn açly to ether “componcnt” or “unit” performance reporting. However, it is a,,’ninwd that pp any particofar contt one viewpoint or the other is adopted, as in some instances a term may apply in one vinvpoint hut not another.
4.1 State
Component or unit state is a particular condition or status of a component or a unit, which is important for outage reporting purposea
4.1.1 In-service state
The component or unit as energized and fully connected to the system.IEEE 859 pdf download.