PHASE COMPARISON RELAY DEVICE

摘要

PURPOSE:To detect occurrence of phase displacement by the fact that at least one output of two superimposed logic products of transmission signals may become rectangular wave signal. CONSTITUTION:Assuming that the angular phase displacement of a filter FIL 2 is alpha, the angle alpha becomes coincident to the duration that transmission signals S1 and S2 are superimposed. Accordingly, the output of an AND gate 11 for detecting the superimposition of the transmission signals S1 and S2 being ''1'' may represent the angle alpha. Time limit operating circuit TED 12 compares the angle alpha with predetermined angle beta as a circuit for obtaining the output when alpha > beta. The output from the TED 11 is continued in a TDD 12 of the next stage to thereby obtain a phase inspecting output.