Advise on Preparation Of Load Schedule

Can't read your spreadsheet too well, but if the kW figures are motor shaft output, you need efficiency in there somewhere.

there are two bore well motors and two mono block pumps. I made the SLD with a 4P MCCB with ELR and CBCT and i put the bus bar as four poles i.e R,Y,B,N and ground as 50%. the rest are all for labour accomodations, staff accomodations, kitchens...

I was only making a general comment. It isn't my field but I suspect the experts would need more detail to help you much.

thank you; your advise was still valuable..

No problem!

What is the object of your load schedule exercise, design the distribution, check the generator sizing? The load factors given to you, a simple percent could include, or may not include loads that are mutually exclusive, such as Pump 1 and Backup to Pump 1. Is there a connection to a separate utility, or is the entire installation run with the generator...

Load factors could be as mentioned earlier, pump & motor efficiency after calculation of hydraulic horsepower (fluid power?)

SLD, MCCB, ELR, CBCT are mysterious, at best, maybe Circuit Breaker in there somewhere. 4P breakers are not needed for 3 phase loads.

Without the calculations in the cells, and not being able to read the cells puts us all at a disadvantage to find even glaring errors or assumptions.

If you gave the starting loads KVA + kW (or at least shaft power & speed), start time & running loads of bore well and pumps, plus data on any other motors & the total of other loads (resistive?) one could give an opinion. Otherwise it is a piece of string.....

You either have a better way of viewing his spreadsheet or you have WAY better eyes than I do! I can only read two words; "Electrical Load" near the left bottom There is another word in the same label that I think starts with "Acc", but I can't distinguish the rest, even after enlarging it.

If possible i will send the spread sheet to your personel mail..

I can't read much of it, but I can just about make out some of the headings. One of them says (I think) fluid power, which as a non-expert seems an odd thing to put on a load schedule, as the wire power would depend on pump efficiency as well as motor characteristics.

<...they...> - at least there is someone there who can receive questions, then? No joy there?

They are only saying it is okay... but i am not sure at all....

If you don't have a copy of NFPA 70: National Electrical Code® you are doomed to fail. It is the the accepted standard almost everywhere.

You must follow all applicable code requirements for your location.

CR4 condenses images if they are too big - your picture is only 400 x 260 pixels & unreadable.

Starting kVA & kW,start times & inertias for each load are critical for "black start" of a system from a DG; as is the capacity of the DG to give high kW & kVA without underfrequency/undervolt problems. What the motors will tolerate, 80% generator volts with suitable cabling & considerable frequency drop 90%, could cause other loads to malfunction.

I cannot read enough to even start on the problem and cannot see your DG specification or length of cable to each load. I am not clear if you are at design stage or already have a scheme done by someone else.

It is usually essential to have a start sequence plan for operator/autosequence, it is usually best to do biggest motors first and get past the big frequency/volt drops before more sensitive loads. But I have no idea what constraints your plant has on sequence or which loads are essential. Folk tend to over-estimate loads and have an aversion to measuring what they really have - you have to push hard to get realistic figures, mech engineers may work out the biggest cold loads then pick motor ratings from catalog which are 40 celsius to standard.

67model

Correct! And if the spreadsheet happened to be created on a Mac, the same process can be used, viewing the .csv file in TextEdit or most any word processor.

Thanks for the tip. Please find the load schedule at the bottom. Your help will be much appreciated...

Thank you all Especially Dick Warner. I noticed it after i was pointed out that the AC KW ratings were really low, the mechanical engineer took the values from some company and assumed the values were so. I've corrected it and also made the main distribution panel into to two since the load is too high for one 500 KVA generator. This is actually for a site in which company workers and officials will be working in for a period of 1 year and 6 months. I just wasn't sure at all because I worked in a Panel Board manufacturing company and I have no experience in this field. Hopefully your advises will help till a senior electrical engineer is hired.

Glad to be of help.

A 250 kW load for 18 months will need about 1100 tonnes of fuel @ 24 h running/day - that's a 15 tonne tanker each week. You will also need lubricating oil, fuel & oil filters, other consumables.

Time to wake up the purchase dept and decide where you can buy, how to get it to site & into tanks.

Consult engine maker for advise on fuel & oil quality - cheap does not pay & you will be dependent on engines for 18 months.

Standard sumps on engines may only give days before top-up - have you got facilities for on-load topping? Or is power strictly during day? How often will maintenance be reqd, who will do it? Take care about under-loading engine as I noted.

What are fuel storage arrangements? Remote sites always had tank with good water space at bottom, below take -off and bottom drain tap at low end for water/crud, always two tanks. A fuel delivery can stir up all the water/rust etc in the tank and block filters - must be allowed to settle before tank used. One delivery of bad fuel with water in it could stop both engines without attention to that.

Like 67model, Glad I could help. Each of us has a different set of knowledge, and based on that knowledge, will tend to notice different problems. I have zero experience with Diesel Generator Sets, while 67model obviously has considerable.

Good luck on you project