Electrical Engineering - What is the voltage drop for 100kw motor if the length of the cable is 200m and what is the cable si

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What is the voltage drop for 100kw motor if the length of the cable is 200m and what is the cable size.

Total Answers and Comments: 4

Last Update: October 21, 2009 Asked by: srinivas

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Submitted by: soumendasbiswas

Full load current for 100Kw is near about 175A.
Let derating factor 0.65 then current is 270 Amp.
We can use 3.5core 150 sq mm XLPE Cable.
Now, Voltage drop for 200meter or 0.2Km for 150sq mm is (0.48X0.2X270)=25.92v/km/amps, which is more than 10% so in this case we have to take 185sq mm XLPE Cable.
We have to maintain voltage drop in between 5%, so the cable size will be 3.5CX185 Sq mm XLPE Cable.

Above answer was rated as good by the following members:
pawansingh

January 17, 2007 17:49:02

CHARLIE MCCANN

RE: What is the CORRECT CABLE SIZE

Q.WHAT SIZE CABLE DO I REQUIRE FOR A 63 AMP SIGLE PHASE CIRCUT WITH A RUN OF 290 MTS UNDERGROUND MANY THANKS

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July 06, 2009 04:21:22

soumendasbiswas

Member Since: July 2009 Contribution: 2

RE: What is the voltage drop for 100kw motor if the length of the cable is 200m and what is the cable size.

Full load current for 100Kw is near about 175A.

Let derating factor 0.65 then current is 270 Amp.

We can use 3.5core 150 sq mm XLPE Cable.

Now Voltage drop for 200meter or 0.2Km for 150sq mm is (0.48X0.2X270) 25.92v/km/amps which is more than 10 so in this case we have to take 185sq mm XLPE Cable.

We have to maintain voltage drop in between 5 so the cable size will be 3.5CX185 Sq mm XLPE Cable.

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Overall Rating: +1

October 20, 2009 08:21:36

mustafa_musvi

Member Since: October 2009 Contribution: 1

RE: What is the voltage drop for 100kw motor if the length of the cable is 200m and what is the cable size.

Mr Biswas please specify
Below is the case you mentioned regarding cable losses
I have 2 questions request for your answer

1 The (0.48) is it resistivity of conductor ? or any other value

2
You have mentioned XLPE cable which is 11KV rated ? where as we have 100KW 3Phase Induction motor LT in this case the equation will be same or changed ?

Full load current for 100Kw is near about 175A. Let derating factor 0.65 then current is 270 Amp. We can use 3.5core 150 sq mm XLPE Cable. Now Voltage drop for 200meter or 0.2Km for 150sq mm is (0.48X0.2X270) 25.92v/km/amps which is more than 10 so in this case we have to take 185sq mm XLPE Cable. We have to maintain voltage drop in between 5 so the cable size will be 3.5CX185 Sq mm XLPE Cable.

Mustafa Ali

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October 21, 2009 03:16:40

soumendasbiswas

Member Since: July 2009 Contribution: 2

RE: What is the voltage drop for 100kw motor if the length of the cable is 200m and what is the cable size.

1.The (0.48) is it resistivity of conductor ? or any other value

Well here 0.48 is the estimated voltage drop in XLPE cable.(You can get this value from any cable manufacture catalogue)

2.You have mentioned XLPE cable which is 11KV rated ? where as we have 100KW 3Phase Induction motor LT in this case the equation will be same or changed ?

Here XLPE cable is 1.1kV rated.

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