Answer / realas

The cable derating factor is the reduction from its present
capacity for a certain gradual amount due to intermittent
ambient temperature, insufficient space, unbalance flux,
higher voltage dropped, depreciation, etc.

To minimize the cause and effect conduct proper survey and
proper wiring to withstand on the cable loads and locations.

Answer / nid

derating factors are differ with the bunching of cables for
single layer it is .9
double layer .71
tripple layer .62
4 layer .56

Answer / viral

Due to partial discharges in cable it can't be utilized to
it's rated capacity.
As current flowing to charge cable capacitance is extra
burden on that which will make it to carry less current for
load.
To reduce this good insulation material should be use.

Answer / jagadisha.n bmsit

Loss of Dielectric strength of cable is the derating factor
of cable.... It can be minimized by selecting the proper
rating of cable with operating conditions and proper
maintenance of cables

Answer / chirag

Derating factor is very useful thing for selection of cable
when it is necessary to laying in air, duct or ground. wIt
depends on the ambient temperatre

Answer / viswanathan.

For obtaining a desired current at the utilisation end of a
cable irresponsible to the rated current carrying capacity
of a cable, many factors to be consider which tends to
reduces the current carrying capacity of a cable. viz
length of cable, connected equipment, inductive, capacitive
loads, etc. these factors will increases the actual current
and desired size of a cable.

Answer / yogesh zambre

Due to partial discharges in cable it can't be utilized to
it's rated capacity.
As current flowing to charge cable capacitance is extra
burden on that which will make it to carry less current for
load.
To reduce this good insulation material should be use.

Answer / mohamed abd elhamid elsaied

Due to partial discharges in cable it can't be utilized to
it's rated capacity.
As current flowing to charge cable capacitance is extra
burden on that which will make it to carry less current for
load.
To reduce this good insulation material should be use.
and this mean that if cable can its rated 100 Amp. it will
max amp 95 Amp.

Hi If connecting a temp generator 670KVA .415kv with step up Tx .415/11kv. I am given Generator impedances Z1 Z2 Z0 to 100MVA base. Do I need to work out the generator fault current by using these impedances i.e gen rating / impedance. Then use this as my source impedance for the calculations that follow.

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