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what are the advantages and disadvantages of oil filled cables
over XLPE cables
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Answer Posted / anil
now most of the HT and EHV cables are with XLPE insulation.
earlier, in mid 70's HT cable are insulated with PILC(paper
insulated and lead covered. OIL is filled to reduce moisture
in paper. disd of PILC cables is very heavy almost double
the weight of XLPE cable but adv is the chance of voids are
very less in PILC cable. Lead is not ECO-friendly,it is
almost banned in europe, US and few countries in ASIA. Cost
is very High as compare to XLPE cable. whereas XLPE cable
are lighter in weight.Long life,easy to handle. jointing is
less costly.
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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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