IEEE 575:2014 pdf free download – IEEE Guide for Bonding Shields and Sheaths of Single-Conductor Power Cables Rated 5 kV through 500 kV
screening conductor: A conductor laid in parallel with a current-carrying loop and itself forming part of aclosed circuit in which induced currents can flow whose magnetic field will oppose the field of the current-carrying loop.
sectionalized cross bonding: The form of cross bonding in which three consecutive minor sections aretaken to form a single cross-bonded unit (see major section ). The three shields/ sheaths are solidly bondedat both ends of a major section and may be grounded at these points. At the two intermediate positions thecables are transposed and the shields/sheaths are interconnected in such a way so that each continuousshield/sheath circuit through the major section occupies the same geometrical position in the cableformation. For long cable routes thcre will usually be a number of rmajor sections.
sheath: Historically the term implied an extruded lead sheath that provided a moisture impervious barrierfor the inner cable core while simultaneously providing the requisite metallic shielding for the cable. Morerecently extruded aluminum sheathing and copper foil laminatcs have been employed in order to providemoisture tightness.
sheath interrupt: A break or interruption,incorporated into the metallic shield/sheath and semiconductingshield of a cable at a joint in order to provide electrical isolation between adjacent cable shield sections.
sheath sectionalizing insulator: An insulating member inserted into the joint and metallic joint casing (ifpresent) in order to electrically isolate the shields of adjacent cable lengths, of the same phase,from eachother;typically this insulating member is a ring made of epoxy or porcelain.
sheath sectionalizing joint: A joint in which the metallic screen and metallic casing， if present，areelectrically interrupted by means of a shield/sheath sectionalizing insulator.
sheath standing voltage: The voltage to ground appearing on the metallic shield/sheath of a speciallybonded cable when balanced full-load currents are flowing in the cable conductors; typically specified atthe point along the cable length at which it is a maximum (that is, at the ungrounded extremity of a minorsection in the case of single-point bonding and at a cross-bonding point in the case of cross bonding). Whenthe voltages differ for the three-phase cablcs, the highest value is typically specified.
sheath voltage limiter (SVL): A surge protective device connected between the metallic shield/sheath andground on specially bonded cables to limit shield/sheath overvoltages during system transients.
shield:A non-moisture impervious metallic outer conductor of single conductor power cables，such asconcentric wires and concentric copper tapes, that provide grounding and a fault current path for the cable.
shicld/sheath: See 3.1.
single-point bonding: The form of special bonding in which the three cable shields/sheaths of a minorsection are solidly bonded together and grounded at one point only. For long cable routes this may berepeated a number of times. See also: multiple single-point bonding.
solid bond: A metallic connection between shields/sheaths or between shields/sheaths and ground.
special bonding: Methods of bonding and grounding the metallic shields/sheaths of single-conductorcables so as to minimize the shield’sheath circulating currents resulting from induction of conductorcurrents.
transposition of power cables: The practice of laying single-conductor cables so that ceach phase cablesuccessively occupies, optimally over equal lengths of the routc, each of the three geometric lay positionsin the formation.