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In a three phase transformer(delta/star connected)when i
touch one end of the bulb in any one phase and other end to
earth..will the bulb glow or not..if not why?..i'm touching
the bulb in star connected side...
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Answer Posted / arockia doss
Bulb will glow.
Since, The req. voltage for the bulb will be coming from
the phase.
The neutral will be coming from the Earth.
Becuase, In the star connected trf. the neutral will be
earthed & So that, the bulb will glow.
Thanks ...
A.Arockia Doss
| Is This Answer Correct ? | 11 Yes | 1 No |
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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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