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AC-DC-AC-DC AC-DC-AC DC-AC-AC-DC AC-AC-DC
slightly less than the oncoming generator frequency the same as the bus frequency slightly greater than the bus frequency the same as the bus voltage
voltage regulator reverse power relay reverse current relay governor control switch
voltage regulators field rheostats reverse power relays prime mover governors
To cut out generators when they are no longer required To cut in additional generators automatically as required To divide the KW load equally between generators operating in parallel To divide reactive current between generators operating in parallel
connected load prime mover speed field excitation generators rated voltage
brushes on a commutator brushes on slip rings slip rings on a commutator direct connections from the stator
DC-DC-AC AC-DC-AC DC-AC-AC AC-AC-DC
Circulating currents are kept to a minimum Field excitation losses are kept to a minimum Generator rotors will have a lesser tendency to hunt Because a power factor increase will decrease kilowatt output
running at the same speed grounded of the same polarity in phase
slightly less than the line frequency the same as the line frequency slightly greater than the line frequency All of the above
frequency number of phases phase rotation All of the above
higher than the bus frequency lower than the bus frequency the same as the bus frequency but out of phase with it the same as the bus frequency and the circuit breaker may be closed at any pointerposition
DC—AC—DC AC—AC—DC DC—DC—AC AC—DC—AC
DC/AC和DC/AC AC/DC和AC/DC DC/AC和AC/DC AC/DC和DC/AC
connected load prime mover speed field excitation generators rated voltage
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