what do you mean by machine floating on bus bars?
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Explanation:
floating” refers to a component that doesn’t have a full time connection to one of the system reference voltages, typically named “ground”.
That lack of connection makes it impossible to have a definite voltage value between the floating part and any part of the rest of the system.
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But at this point of time generator 2 is not taking any load as its induced e.m.f. is equal to bus-bar voltage. The present condition is called floating, that means ready for supply but not supplying current to the load. ... To maintain bus-bar voltage, the field of generator 1 is weakened so that value remains constant.
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