Question

6. Two identical 15 kV generators are to be connected in parallel. Both are running at rated speed and voltage. There is an open three pole 6-terminal single-throw fused switch between them, connected to the generator terminals (a1, b1.c1) and (a2,b2,c2) on each side, respectively. a1 b1 c1 = a2 b2 c2 Before we close the switch, we check the voltage across phase a with an ac voltmeter and find that Va1 Va2 = 0. With an oscilloscope, we display the voltage "Vai(t) - Vaz(t)" and get a flat line, indicating that the two voltages are in phase. We now close the switch and at least two fusses blow. Why?

Answer 1

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