To provide a method and an apparatus, for the control of the parallel- off of a generator, in which the sound-side generator shaft of a generator main circuit can be protected from a generator-current zero-point transition phenomenon.
When the possibility of generation of the generator-current zero-point transition phenomenon can be estimated, individual electrical accident elements which cause the phenomenon, or the signal of the output of a generator lockout relay which integrates the elements in terms of a circuit, are used. A time delay by a timer is caused deliverately. Synchronization of an event is prevented. Alternatively, when the event can be estimated through calculation, the output of the reactive power of the generator is increased. As a result, a generator-excitation current control operation, in which the generator is paralleled off in such a way that the AC current amplitude of a sound-shaft generator is increased and that a current zero pint is eliminated is constituted, so as to be built in a control mechanism.
| JPH08214444 | DIGITAL RELAY AND DIGITAL ARITHMETIC PROCESSING UNIT |
| JPH09261840 | PROTECTION RELAY |
UDA KENGO
FUKAI MASAYUKI
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