Standby Diesel Generator - Switching Loads Question
Standby Diesel Generator - Switching Loads Question
(OP)
All,
I have a 3 phase, 415V, 1100kVA diesel generator as an emergency standby,the diesel engine is 1000KW. Currently I have 7 distibution boards that are supplied by 2 incoming feeders from the 6.6kV board. 1 feeder is supplying 2 boards that are conected together by the busbar tie and it is showing 102A 415V load, the other feeder is supplying the remaining 5 boards connected together by the busbar ties and that is showing 383A 415V. We have a board ouage planned on the 6.6kV and I plan to run up the emergency standby diesel and then switch boards across onto it in order to prevent loss of supplies. What is the maximum I can switch onto a generator of that size in one switch? Is their a calculation to show the maximum DOL load at any given time?
Many Thanks.
I have a 3 phase, 415V, 1100kVA diesel generator as an emergency standby,the diesel engine is 1000KW. Currently I have 7 distibution boards that are supplied by 2 incoming feeders from the 6.6kV board. 1 feeder is supplying 2 boards that are conected together by the busbar tie and it is showing 102A 415V load, the other feeder is supplying the remaining 5 boards connected together by the busbar ties and that is showing 383A 415V. We have a board ouage planned on the 6.6kV and I plan to run up the emergency standby diesel and then switch boards across onto it in order to prevent loss of supplies. What is the maximum I can switch onto a generator of that size in one switch? Is their a calculation to show the maximum DOL load at any given time?
Many Thanks.





RE: Standby Diesel Generator - Switching Loads Question
RE: Standby Diesel Generator - Switching Loads Question
RE: Standby Diesel Generator - Switching Loads Question
RE: Standby Diesel Generator - Switching Loads Question
http://www.csemag.com/single-article/comparing-gen...
This is a good article that compares the features of some of the software's available the what you need to look for in sizing a generator to a system.
Virtually all of the USA genset manufacturers offer sizing software's for free (all you have to do is register), such as CAT, Cummins, Kohler and Generac.
There are a lot of things that come into to play in sizing a standby for multiple loads, including types of loads, load sizes, and what your system tolerance is for voltage and frequency deviations during transient events.
MikeL.
RE: Standby Diesel Generator - Switching Loads Question
RE: Standby Diesel Generator - Switching Loads Question
That should have no trouble in accepting a 102 Amp load and a 383 Amp load.
If you are able to sync the standby generator to the grid, then, with the governor in droop mode, you can advance the speed setting until the generator has picked up all the load (or 95% of the load to avoid the chance of getting into power export issues).
Once the load is picked up by the generator, drop out the grid connection. (Or the 6.6 kV feeder.)
The transfer will be easy and seamless.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Standby Diesel Generator - Switching Loads Question
CR
"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]
RE: Standby Diesel Generator - Switching Loads Question
I saw one commissioning of generator: Maximum load is a composite calculation on each motor started at a time,as;
sQRT3 x V x starting current x PF at starting, Starting current depends starting methods (DOL, Y/D, Auto-trans, etc.)
"..the more, the merrier" Genghis Khan