IEEE 1234-2019 pdf free.IEEE Guide for Fault-Locating Techniques on Shielded Power Cable Systems.
3. Definitions, acronyms, and abbreviations
3.1 Definitions
For the purposes ofthis document, the following terms and definitions apply. The IEEE Standards 1)ic-sionarv Online should be consultcd for tcnns not dcfincd in this clause.
aerial installation type: An assembly of insulated conductors installed on a pole or similar overhead structure:
at may be self-supporting or installed on a supporting messenger cable.
bolted fault: A short-circuit cable fault having a resistance value of less than 5 ii.
branch circuits: A cable system in which independent cables branch out radially from a common source of supply. Se’also: radial feed.
breukdossn: A disruptive discharge through insulation.
I)urncr or burn set: The test equipment used to convert a high-resistance or intermittent cable fault to a low- resistance fault.
burning: The process of conditioning a faulted cable by reducing the fault resistance.
cable tray installation type: Cables routed through cable tray systems consisting of ladders, troughs. channels, solid bottom, and other similar structures.
characteristic impedance: The driving impedance ofthe forward-traveling transverse electromagnetic wave of the cable.
conduit installation type: Conduit may be designated as metallic or nonmetallic, such as galvanized steci or iron pipe conduit, tile conduit, polyvinyl chloride (PVC) or polyethylene (PE) conduit, fiberglass conduit, etc.
direct-buried installation type: Cable that is laid in a trench and covered with sand, specially prepared backfill material. andior excavated material. Cables can be plowed directly into carth or installed using guided boring techniques. Precast troughs can be installed just below the surface and cables can he installed within the trough either by laying or pulling. The troughs are later covered with either solid or ventilated covers.
duct hank installation type: A group of conduits held in a fixed regular configuration. The backfill may contain reinforcing to protect against damage by outside physical loads.
estruded dielectrics: Cables with polymeric insulation, such as polyethylene (PE), cross-linked polyethylene (XLPE), tree-retardant cross-linked polyethylene (TRXLPE). ethylene propylene rubber (EPR), etc.
fIashoer: A disruptivc discharge through airaround or ovcr the surface of a solid or liquid insulation, between parts of ditierent potential or polarity, produced by the application of voltage wherein the breakdown path becomes sufficiently ionized to maintain an electric arc.
hipot: An abbreviation for high potential in the context of test equipment.
intermittent fault: An infrequent, non-constant fault that often appears voltage dependent.
laminated dielectrics: Insulating tapes consisting of paper or a combination of paper and a polymer, such as polypropylene, impregnated with an insulating saturant.
loop feed: A number of tie feeders in series, forming a closed circuit.
neti ork feeder: A primary feeder that supplies energy to a secondary network. nehork ssstem: Ste: network feeder.
non-network system: A primary feeder or cable rhich supplies energy directly to a consumer. pinpoint: Locating the exact fault location for excavation and repair.
pre-locate: Locating the general area of a fault as a distance from cable start, end, splice, transformer, change in cable type. etc. Identifying a faulted section of cable between two transformers, junction boxes, manholes.
propagation selocity: The velocity at which an electromagnetic signal travels through a cable. Propagation velocity is usually expressed in feet. yards, or meters per microsecond or as a percentage of the speed of light. The value of the propagation velocity for any particular cable depends on the (relative) dielectric constant of the insulation material used; it is assumed to be constant for practical purposes.
radial feed: Acable system in which independent feeders branch out radially from a common source of supply. reflection coefficient: A measure of how much of an incident wave is reflected back to the source.
shield (metallic type): A nonmagnetie metallic layer applied over the outer nonmetal lie scmiconducting layer ofan insulated cable. S,t: shcalth (metallic tpc).
shielded cable: A cable in which each insulated conductor or conductors is/are enclosed in a conducting envelope(s).
shield interrupt: An insulated break installed in a cable metallic shield so as to interrupt the flow of induced current in the metallic shield. They are typically made at splice locations and used when special bonding(i.e.. cross-bonding or single-point bonding) is applied to the circuit. S,vn: shield break.IEEE 1234 pdf download.