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Anonymous Poster

Diesel Generator Selection

09/29/2010 2:49 AM

Please explain the main consideration for a selection of a generator for below requirment.

I want to run a 100kW, 415V , 92% efficiency motor with DOL starter on a disel generator set, kindly advise how to select the generator kVA for 100kw , in general what are the factors that need to be considered in selection a generation KVA( the generator loading is with only one motor of above said rating)
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TonyS
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United Kingdom - Member - New Member

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
Good Answers: 181
#1

Re: Disel generator selection

09/29/2010 3:13 AM

You really should look at a soft start unit rather than DOL otherwise your going to be spending a lot of money for a generator with enough punch to get the drive going.

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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
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#2

Re: Disel generator selection

09/29/2010 4:14 AM

Why not cut out all the electrical confetti and simply drive whatever device this is right off the engine? (There may be good reasons, but....)

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nadim7862
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Engineering Fields - Instrumentation Engineering - New Member

Join Date: Aug 2010
Location: New Delhi
Posts: 5
#3

Re: Disel generator selection

09/29/2010 4:53 AM

Load of Motor is =100 KW

KVA Calculated of Motor= 100/0.85 = 117.65 KVA

Starting KVA Load = 6x 117.65 = 709 KVA

Combined Impedence & Voltage Drop is , 4% DG impedance and a voltage drop of 15%, then the DG rating for Load would be = (Impedence/Voltage Drop) x Calculated Load KVA * Design Margin

Design Margin is = 1.15

DG rating for Load =(4/15)*709*1.15 = 218 KVA

DG rating selected = calc KVA * Diversity factor =218*1.5=327 KVA
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electricalexpert65
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Join Date: Oct 2009
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#4
In reply to #3

Re: Disel generator selection

09/29/2010 9:38 AM

Excellent! GA to you!
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electricalexpert65 (1); nadim7862 (1); TonyS (1); Tornado (1)

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