Anyway thanks all of you for the great ideas and further resources. I guess it's a letdown just to be relay settings. That old saw about hoofbeats seems applicable...
Well, anyone curious as to how it turned out. All incorrect relay settings. First the undervoltage trip occured because the relay timer on that fct was 100 ms. Fixed that. Then we had overvoltage trips. Two things: relay set at 105% instead of 110%, as reported, and we increased function...
We're unable to start a 1500hp, 4000 volt motor operating a centrifugal pump under generator power. Pump starts against closed valve that slowly opens in 3 minutes. But we don't get there. Gen manuf.-set CB trips on undervoltage. Generator manufacturer assures us that the gen-set is sized...
When pulling a new 600 volt feeder, consisting of (4) 500 kcmil and (1) 4/0 grd; I am confused about what diameter cable to use in the weight correction factor calculation. Or, if I can even use that formula for weight correction factor. Cablec's old manual just says that if all cables are not...
We're specifying a portable (moved around as we renovate 10 stations over the next 8 years) hydropneumatic pump station with 2 duty 1 standby centrifugal pumps with VFD drives. The pumping rate is proposed to be tied to the flow rate out of station. If the first pump can't keep up, we start...
