| 摘要 |
In a protective relay system according to an aspect of the present invention, a direction of a fault is correctly determined during system oscillation using one of a negative-phase-sequence relay (13) and a zero-phase-sequence relay (40). A circuit breaker is tripped only when an internal fault is determined at both terminals to be protected using a carrier signal (15-S, 16-R). Thus, even though a fault occurs during system oscillation, the circuit breaker (CB) can be tripped against the internal fault.
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