| 摘要 |
A generator system which is self-excited even during a fault condition includes a main generator having armature windings and a main field winding which is excited by a rotary transformer. The rotary transformer includes a stationary primary winding and a rotating secondary winding, with the primary winding receiving a controlled portion of the main generator armature output. The current through the primary winding of the transformer is controlled by silicon controlled rectifiers which are gated by a voltage regulator circuit. The voltage regulator circuit in turn receives signals from the voltage delivered to the load, the highest phase current delivered to the load and the voltage at the main generator armature output. The voltage regulator controls the current through the primary winding of the transformer in accordance with the voltage delivered to the load if that voltage is greater than a predetermined value. If the voltage delivered to the load is less than the predetermined value, such as when a fault condition arises, the current through the primary winding of the transformer is controlled in accordance with the voltage at the main generator armature output. A current limiter is also provided to limit the output current from the main generator armature during a fault condition to maintain the voltage of the generator armature at acceptable levels for self-excitation.
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