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Fig. 12: Lightning impulse withstand of sheath interrupts and cable jacket. Switching surge impulse withstand of the sheath interrupt and jacket are assumed being just like other insulator varieties and are eighty three% from the lightning impulse withstand ranking (BIL). When You will find a switching surge occasion to the section conductor of the cable, The existing by means of it can induce a voltage within the sheath in precisely the same way it does at steady condition or throughout fault gatherings, While the wave shape is noticeably different.
Fig. fifteen: Voltage and latest on stage conductor of 345 kV cable with one hundred kA surge to stage numerous spans from transition pole. Calculating margin of safety (MP1) for lightning is very similar to what is finished in the situation of switching surges. Listed here, ten kA is used for the coordinating present and the total BIL is utilized for withstand of the jacket and interrupt insulation.
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In order to be successful, the circuit size has to be divided into teams that allow the sheaths of every in the section cables to get joined to one another in a very regular sample. These groups are referred to as tri-sections and ideally they contain an equal size of every of the period cable sheaths. The arrangement requires Each and every tri-area to get Particular joints containing sectionalizing insulators that interrupt the cable sheath continuity.
SVL may be the protective unit to Restrict induce voltages showing to the bonded cable system as a result of limited circuit.t is essential to suit SVL’s concerning the metallic display screen and ground Within the link box.
The sheath currents in solitary-Main cables are induced by “transformer” influence; i.e.by the magnetic discipline of alternating present-day flowing in cable conductor which induces voltages in cable sheath or other parallel conductors.
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Summing up induced voltage in sectionalized display from Each and every section causing neutralization of induced voltages in a few consecutive minimal sections.
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