SKYDDANDE RELEANDE BRYTARUTLOSNINGSSYSTEM FOR EN FLERFASIG KRAFTOVERFORINGSLEDNING

摘要

A reliable segregated phase comparison relaying apparatus for protecting a polyphase transmission line in which the phase conductors subjected to a ground or a residual fault may be easily detected and the fault current interrupted without a reduction in the security of the non-faulted phase conductors and in which the phase comparison function can be immediately interrupted as, for example, due to a complete or partial loss of signal while still maintaining a secure unblock tripping in the event of the occurrence of a fault during this interruption.