DG Set Selection Points

Ooooh. Loads more:

• Voltage
• Frequency
• Number of phases
• Fuel type
• Environmental conditions
• Size
• Weight
• Mounting location
• Access
• Fuel tank location
• Fuel pipe route
• Exhaust pipe route
• Local noise emission limits
• Etc., etc.

Pl check if the DG is for prime or standby power. If the selected size DG is capable to cater starting of highest load while other loads are running.

I have checked this. As i have written that capacity wise i have taken all considerations. I want to know other factors which effect the selection of DG set like

Engine type - if any specifeied

cooling - water / air

Speed - High/low

etc-etc

Have you checked if the DG require harmonic filter? in case DG loads are non linear type.

Please give me your e-mail iD i will send you generator aplication and installation document which will be handy to select your generator you check cummins web site they have welth of information on selection of Generators which can be downloded.

crm

Good day,

please send the dg selection guide to my email id :syedalik@rediffmail.com

regards,

syedalik

1. As mentioned elsewhere, fuel efficiency & fuel cost should be factored in. Ditto for maintenance requirements - zero kW is available when servicing. Also factor in the availability of spares & service personnel (try 02:00 am on Easter Friday & see who'll respond!)
2. Depending on your application, you could consider 2x500kVA in stead of 1x1000kVA.
• Some diesels are not so effective when running on less than 30% load - in such a case a 250kVA load will jump from 25% load to 50%.
• Also efficiency at full load is typically better than at partial load.
• Thirdly, depending on application, it is sometimes better to have 500kVA available in case of failure, as opposed to total loss of power (redundancy). As an example, my company seems to have standardised on 250kVA units. We can then have one spare that we can install within 12hrs in most places. We could not keep a 1000kVA spare, nor move it so easily.
• It is expandable.
  
3. Look at the startup requirements. In one of our applications, we let the various aircons come in sequentially, so that the start-up current of the compressors would not exceed the rating.
4. Keep it simple when you can. I prefer air cooling, but it is expensive and not suited to very dusty/dirty environments. Ensure your cooling system is rated for your worst case temperatures, and for you altitude as well. (Ensure your building does not just re-circulate the hot air!)
   

Talk to the manufacturers!

PetroPower:'s all suggestions are excellent except, I will suggest you to go by heatexchenger cooler. Its trouble free and gives a good cooling during high ambient.

Dear Mr.achawla77,

You have stated " WE WANT TO HAVE AN 1000 KVA ......."

From your statement, it conveys a message to this Forum, that you have arrived at the capacity of the DG Set.

It is not clear, from your message,

1. What is the Highest Load - Motor H.P to be started, whether it is to be started on Load or after starting the Motor the motor is loaded.

2. The type of Starter that is used.

3. What is the Percentage of coming on the Generator, If it is less than 60%, Fuel economy will be a problem.

DHAYANANDHAN.S