at the local bank we just installed a 3phase generator (delta system)w/ auto transfer switch to keep the data processing part up and running during an outage. when the service tech fired up the generator, it runs great voltage holds steady. put it under load the needle starts bouncing all over the place, the flourescent lights start flickering, ups systems start getting unstable, and it fries boards in the large 3 phase sorter. you take and adjust the regulator so the needle holds steady everything is fixed except the ups systems still are unstable. the tech guy replaced the regulator twice to no avail. he feels its the ups systems causing harmonics. this generator just feeds the data processing part of the bank (PC's, Flourescent lights, small portable A/C, 2 servers, the sorter and a few other small odd things in the room. what can the tech do to correct this problem? is it harmonics?
Loads across the phases:
A- 28
B- 2 (only 3 phase equipment was sorter)
C- 26
the tech started throwing out ideas the banks "could do" to help reduce the "harmonics". but it shouldn't be upto the bank, they just spent $20k+ on the generator they should make it right. we gave the company all the loads (A,V,W,VA, # of phases per load, etc...) and then the company sized the generator according.
thanks for the time!
