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Answer Posted / jaswant rajawat
Bus earthing truck is use to earth bus bars of switchboard
at the time of maintenance of bus bars. For this we have to
remove incomer breaker panel and insert bus earthing truck
so that bus bars will remain earthed during maintenance.
Cable earthing truck is use to earth incoming cable or
outgoing feeder cable in switchboard during maintenance at
transformer end or motor terminal box.
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3 shows a 415 V, 3-phase generator supplying a 3-phase 415/110 V transformer. Draw the individual and combined impedance diagrams to a base of 10 kVA. Determine the system fault kVA and the fault currents at the 415 V and 110 V busbars for short circuit faults on the transformer input or output terminals. Work in p.u. values of impedances.
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