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Cross bonding boxes are employed at the two intermediate joint locations, where by the cross connections are created within the link boxes. These link boxes incorporate SVL’s to guard against excessive transient voltages in the course of system faults.
The most basic type of Specific earth bonding involves creating preparations with the cable sheaths of the three large-voltage cables to get linked and bonded at a single stage along the length from the circuit.
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Zero volt with regard to your earth grid voltage within the earthed end, standing voltage for the unearthed finish.
Fig. twelve: Lightning impulse withstand of sheath interrupts and cable jacket. Switching surge impulse withstand from the sheath interrupt and jacket are assumed to be just like other insulator forms and so are 83% from the lightning impulse withstand rating (BIL). When there is a switching surge occasion within the phase conductor of the cable, The present by means of it is going to induce a voltage to the sheath in exactly the same way it does at constant condition or in the course of fault situations, even though the wave shape is drastically distinct.
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Standing voltage around the cable display is proportional on the size from the cable plus the magnitude of recent while in the core.
Against this, the SVL design proven in Figure six has sheds just like an arrester as it is intended for outdoor software.
A procedure is solitary point bonded if the preparations are this sort of which the cable sheaths supply no route for your move of circulating currents or exterior fault currents.
This can be the simplest form of Exclusive bonding. The sheaths of your 3 cable sections are related and grounded at a person position only along their length
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Grounding link boxes are utilised at Each and every conclusion of each tri-segment to bond the three cable sheaths to one another and to provide a very low resistance floor connection. Link Boxes with / Without Svl