Answer Posted / sai bhargava
An inverter converts Direct Current (DC) to Alternating Current (AC) or vice versa. A UPS consists of a battery charger, batteries (thus saving DC power), and an inverter (to convert to AC) all in one unit.
When the power goes off the supply of electricity to the battery charger part of the UPS is no longer fed, but the batteries still supply the inverter part (and ultimately whatever is running off of the UPS) with power until they run out.
The inverter alone is useless with out DC power supply (battery).
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Is potential difference materials property ..? if yes tnen how.. explain brifly.
We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?
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