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necmettinsengun
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Join Date: Apr 2007
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Mv Motor Cable Size

05/27/2011 11:16 AM

my friends

how can i calculate cable size of 5.5kv, 250kw motor for 200 meter.

please help

take care, have a nice life

necmettin sengun
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Pathfinder Tags: mv motor cable size
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redfred
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#2

Re: Mv Motor Cable Size

05/27/2011 11:33 AM

You don't calculate this cable size. You look up the required cable size by your wiring standards for your location.

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PWSlack
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#3

Re: Mv Motor Cable Size

05/27/2011 11:34 AM

British Standard 7671.

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harry potter
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#4

Re: mv motor cable size

05/27/2011 11:37 AM

Dear,

MV Cable is selected on

1. Short circuit current capacity - Calculate the system fault levels , say 3.5 KA

Then, Minimum 25 sq mm cable required.

2. Current Rating - Mfr. data sheet - Ir(25Amp)*derating factors ( App. 0.65) >38Amp

Then, Minimum 6 sq mm Aluminium cable required

3. Volt Drops permitted , say 3% of 5.5 KV - 165 Volts

Volt Drop DV = 1.732*IL * (R*L / 1000)

_________________ =

power factor

= 1.732*25*1.54*200/1000

____________________ = 14.8 V

0.9

Whichever size is higher shall be selected. So, select 25 sq mm minimum for 250 KW motor. @ 5.5 KV

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redfred
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#6
In reply to #4

Re: mv motor cable size

05/27/2011 1:38 PM

Do you really think that the only criteria for a power distribution cable is the voltage drop at full load? Sigh.

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TonyS
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#5

Re: Mv Motor Cable Size

05/27/2011 1:09 PM

We could calculate the required cable size, but then you run in to a problem. Finding a cable manufacturer that produces a 10mm cable rated at 6.6KV.

Look at things practically, look at cable specifications. You have to choose the nearest that suits the situation.

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hien.nguyenquoc
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#7

Re: Mv Motor Cable Size

05/27/2011 9:49 PM

Look at the book, look at the calculation method they teach. Don't be too stingy.

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