Detailed Notes on End caps
Detailed Notes on End caps
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Link Boxes with Svl It is necessary to fit SVL’s among the metallic display and ground inside the link box. The screen separation of power cable joint (insulated joint) will likely be guarded towards feasible damages as a result of induced voltages brought on by brief circuit/break down.
Fig. 12: Lightning impulse withstand of sheath interrupts and cable jacket. Switching surge impulse withstand of the sheath interrupt and jacket are assumed to generally be just like other insulator types and are 83% of your lightning impulse withstand score (BIL). When You will find there's switching surge function over the stage conductor of the cable, The present as a result of it will eventually induce a voltage within the sheath in the same way it does at constant point out or for the duration of fault events, While the wave shape is drastically distinct.
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Various grounding, rather than just grounding at both finishes, is solely the grounding with the cable protect or sheath in the slightest degree obtain details, for instance manholes or pull boxes. This also boundaries attainable defend damage to only the faulted segment.
The parallel floor continuity conductor will likely be insulated to stay away from corrosion and transposed, In case the cables usually are not transposed, to stop circulating currents and losses during standard operating problems.
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Suitable for more time cable section when compared to single–position–bonding system and solidly bonded single-Main system.
For cross bonding, the cable length is split into 3 about equivalent sections. Every on the three alternating magnetic fields induces a voltage with a phase shift of a hundred and twenty° during the cable shields.
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Because the voltage and present on the conductor through a switching surge will not be sinusoidal or even a very simple impulse (see Fig. thirteen), it really is not possible to correctly predict the ensuing voltage and existing around the sheath.
The link box optimizes reduction management within the cable shield on cables grounded both sides. In HV Cable the bonding system is so developed that the cable sheaths are bonded and earthed or with SVL in this kind of way as to eliminate or reduce the circulating sheath currents. The link box is an element of bonding procedure, which is critical of improving upon present-day carrying potential and human defense. SHEATH VOLTAGE LIMITERS (SVL) (SURGE ARRESTORS)
There is absolutely no normal method prescribed by IEC or IEEE for choosing the optimum ranking for cable sheath/jacket protection.
For cross bonding, the cable length is divided into a few somewhere around equal sections. Transpose cable core to equilibrium the magnitude of induced voltages for being summed up. MECHANICAL Functions
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