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power2020
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Joined: 20-May 07
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Last Seen: 2nd October 2008 - 07:26 AM
Local Time: Mar 15 2010, 06:10 AM
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8 Sep 2008
Hi
I am working for a Brown field project, where we are adding two 75kw motors (pumps) on the existing 415V LV siwtch board. This switchboard (bus rating 600A) is fed by 300KVA Generator and 300KVA Transformer. Generator is for emergency operation. We have exixting (base) load of 140kw. and we need start one of these new motors. When I do calculations for motor starting voltage drop with DOL mode, the voltage dip is around 10% at motor terminals when transformer is in operation But 37% with generator operation. So it is not safe to start 75kw motor in Direct mode during generator operation. hence, i am planning to propose a soft starter. Please advice me, 1) does this a right option? 2) Whether a soft starter can work all right during Geneartor in operation? 3) If yes what parametaers, i need to specify for soft starter. I dont have complete details of load inertia, etc at this stage, as we are in still design stage. Motor - 415V, 3phase, 50Hz, 75Kw, Applicatiopn - Cent Pump. Generator is 300KVA, 415V, 50Hz, 1500rpm diesel generator set and i didnt get details of generator XD", Inertia etc, since it is 15 years old one. (some how data got missed). Please advice me what are the typical values of inertia for 300Kva Generator and 75 Kw motor. Thanks in advance VSR
20 May 2007
Dear Folks,
Please advice me what is the vacuum contactor feeder rating required for 315KW, 3.3 KV motor? Motor current is 110A, (3.3kv). Is 400A vacuum contactor feeder is sufficient for this motor? or should we need to go for 630A? Pl suggest Fuse rating (also) required for this motor. Thanks in advance. |
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Lo-Fi Version | Time is now: 15th March 2010 - 06:10 AM |
