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WHAT IS THE DIFFRENCE BETWEEN EARTHED AND UNEARTHED CABLE
(XLPE)?
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Answer Posted / kalyan chekuri
I have a system which had 400kV 100 MVA/11 kV 50 MVA/11kV 50
MVA transformer whose secondary is earthed with NGR of 300
Amps. I have bought 18000 Km of 11 kV earthed cable to lay
on 11 kV side of it. If the phase to earth voltage is 6.4kV
and root 3 times is the voltage expected to go up i.e 11kV,
why cant it be used if the power frequency withstood for
17kV for 5 minutes
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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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