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Three-phase induction motors are being supplied by an OPEN Y-DELTA transformer bank, i.e., there are only two primary phases. If one of the primary phases opens, what is the effect on the motors ?

I am supplying loads with THD = 120%. Do I need to derate the ckt bkrs ?

re alternators: What does AVR mean ?

Thanks ScottyUK Max starting voltage dip 35% Max freq dip 6 Hz Altitude 3000 ft Max ambient 95F Duty = standby Diesel All motors 208V, 3 ph, rated in hp Step 1 7.5 5 5 3 2 Step 2 7.5 5 2 Step 3 3 3 1.5

Standby genset needed to supply motors (1.5 hp to 7.5 hp). Mfr A says his 40 kW set will supply the load; Mfr B says he must use a 100 kW. Why the huge difference ?

EGC (equipment grounding conductor)originating at service switchboard is bonded to 480V, Y-connected generator's equip bonding terminal. Ground ring at genset is bonded to genset neutral and to EGC. Genset is approx 400 ft from switchboard. There are no 277 loads so there is no NEUTRAL...

480, 3ph, 3 wire system supplied by generator. Should generator neutral be solid grounded or resistance grounded ? If resistance, how is resistor rating determined ?

If a Feeder ckt supplies only 3-ph and 208 1-ph loads, will adding the neutral conductor minimize voltage imbalance ? Or does neutral accomplish nothing ?