| 摘要 |
A method for the protection of double circuit electrical power lines (IL-1, IL-2) protected by local and remote circuit breakers (BS1, BS2, RR1, RR2, BR3, BR4, BR5). The method is performed by a local protection apparatus (RS1/RS2 or RS12) and comprises sensing electrical quantities measured at the local end of both circuits of the double circuit lines, monitoring the sensed electrical quantities to detect occurrence of a fault (Fl or F2 or F3), delaying operation of the local circuit breakers (BS1, BS2) on both c
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