Phase comparison relaying device

Claim 1

IN A RELAYING NETWORK FOR PROTECTING A LINE SECTION AGAINST INTERNAL FAULTS IN WHICH SENSING MEANS IS PROVIDED TO SENSE THE DIRECTION OF FLOW OF AN ELECTRICAL QUANTITY AT SPACED PORTIONS OF THE SECTION AND IN WHICH SAID SENSING MEANS HAS A PULSING OUTPUT, THE PHASE OF WHICH IS DEPENDENT UPON THE DIRECTION OF FLOW OF SAID QUANTITY , THE COMBINATION OF FIRST AND SECOND PHASE SENSING NETWORKS, FIRST AND SECOND DELAYING NETWORKS, SAID FIRST DELAYING NETWORK HAVING A SIGNAL OF PREDETERMINED MAGNITUDE AT THE TERMINATION OF ITS TIMING PERIOD, A WITCHING APPARATUS INCLUDING MAGNITUDE DETERMINING MEANS FOR DETERMINING THE MAGNITUDE OF A CONTROL SIGNAL WHICH IS REQUIRED TO ACTUATE SAID SWITCHING APPARATUS, MEANS CONNECTING SAID FIRST DELAY NETWORK TO SAID SWITCHING APPARATUS FOR ACTUATION OF SAID APPARATUS THEREBY, A SENSITIZING CIRCUIT CONNECTED TO SAID SWITCHING APPARATUS AND EFFECTIVE TO ACTUATE SAID MAGNITUDE DETERMINING MEANS, SAID SENSITIZING CIRCUIT HAVING A FIRST OPERATING CONDITION FOR ACTUATING SAID MAGNITUDE DETERMINING MEANS TO PROVIDE THAT SAID REQUIRED MAGNITUDE OF SAID CONTROL SIGNAL TO BE OF A FIRST SIGNAL MAGNITUDE AND A SECOND OPERATING CONDITION IN WHICH SAID REQUIRED MAGNITUDE OF SAID CONTROL SIGNAL IS SAID PREDETERMINED SIGNAL MAGNITUDE, FIRST MEANS FOR ENERGIZING SAID FIRST AND SECOND PHASE SENSING NETWORKS WITH A FIRST SIGNAL PULSING AT A PREDETERMINED RATE, SECOND MEANS FOR ENERGIZING SAID FIRST AND SECOND PHASE SENSING NETWORKS WITH A SECOND SIGNAL PULSING AT SAID PREDETERMINED RATE, SAID FIRST AND SECOND PHASE SENSING NETWORKS BEING CONNECTED INDIVIDUALLY TO SAID FIRST AND SECOND DELAYING NETWORKS RESPECTIVELY AND EFFECTIVE TO CAUSE THE RESPECTIVE SAID DELAYING NETWORK TO TIME OUT SOLELY WHEN THE RELATIVE PHASE OF SAID FIRST AND SECOND SIGNALS IS WITHIN A PREDETERMINED MAGNITUDE, THIRD MEANS CONNECTING SAID SECOND DELAY NETWORK TO SAID SENSITIZING CIRCUIT WHEREBY SAID SENSITIZING CIRCUIT IS ACTUATED FROM ONE OF ITS SAID CONDITIONS TO THE OTHER OF ITS SAID CONDITIONS AS A CONSEQUENCE OF THE TIMING OUT OF SAID SECOND DELAYING NETWORK.