Distance relay actuated phase comparison relaying device

Claim 1

IN A RELAY DEVICE FOR USE IN PROTECTING A TRANSMISSION LINE SECTION, A TRANSMITTER ADAPTED TO SUPPLY FIRST AND SECOND OUTPUT SIGNALS AS A CONSEQUENCE OF THE APPLICATION THERETO OF FIRST AND SECOND INPUT SIGNALS RESPECTIVELY A SWITCH ACTUATABLE FROM A FIRST TO A SECOND OPERATING CONDITION AS A CONSEQUENCE OF THE APPLICATION OF A CONTROL SIGNAL THERETO, DESENSITIZING MEANS CONNECTED TO SAID SWITCH AND NORMALLY MAINTAINING SAID SWITCH INEFFECTIVE TO BE ACTUATED BY SAID CONTROL SIGNAL, CURRENT ACTUATED MEANS INCLUDING A CURRENT NETWORK OPERABLY CONNECTED TO SAID TRANSMITTER, SAID CURRENT ACTUATED MEANS BEING OPERABLE AS A CONSEQUENCE OF CURRENT FLOW THROUGH SAID CURRENT NETWORK IN FIRST AND SECOND DIRECTIONS TO SUPPLY SAID FIRST AND SAID SECOND INPUT SIGNALS TO SAID TRANSMITTER, A CONTROL NETWORK HAVING FIRST AND SECOND INPUT CONNECTIONS AND AN OUTPUT CONNECTION, MEANS CONNECTING SAID OUTPUT CONNECTION TO SAID SWITCH TO RENDER SAID SWITCH ACTUTABLE BY SAID CONTROL NETWORK, SAID CONTROL NETWORK BEING EFFECTIVE TO ACTUATE SAID SWITCH FROM ITS SAID FIRST TO ITS SAID SECOND CONDITION SOLELY WHEN FIRST AND SECOND INPUT QUANTITIES ARE APPLIED TO SAID FIRST AND SECOND INPUT CONNECTIONS, CIRCUIT MEANS CONNECTING SAID CURRENT NETWORK TO SAID FIRST INPUT CONNECTION WHEREBY SAID CONTROL NETWORK, SAID CURRENT NETWORK BEING EFFECTIVE TO SUPPLY SAID FIRST INPUT QUANTITY TO SAID INPUT CONNECTION AS A CONSEQUENCE OF CURRENT FLOW THROUGH SAID CURRENT NETWORK, A SIGNAL RECEIVER OPERATIVELY CONNECTED TO SAID SECOND INPUT CONNECTION, SAID RECEIVER BEING EFFECTIVE TO SUPPLY SAID SECOND INPUT QUANTITY SOLELY WHEN ACTUATED IN A PREDETERMINED MANNER WITH RESPECT TO THE DIRECTION OF CURRENT FLOW SUPPLIED TO SAID CURRENT NETWORK, FIRST AND SECOND DISTANCE RELAYS, EACH SAID RELAY INCLUDING A CONTROL DEVICE ACTUATED AS A FUNCTION OF THE COMBINED MAGNITUDE OF VOLTAGE AND CURRENT QUANTITIES SUPPLIED THERETO, CIRCUIT MEANS INTERCONNECTING SAID CONTROL DEVICES OF SAID FIRST AND SAID SECOND DISTANCE RELAYS TO SAID TRANSMITTER, WHEREBY SAID TRANSMITTER IS ACTUATED TO SUPPLY ONE OF ITS SAID OUTPUT SIGNALS AS DETERMINED BY THE DIRECTION OF CURRENT FLOW THROUGH SAID CURRENT NETWORK, AND CIRCUIT MEANS CONNECTING SOLELY ONE OF SAID FIRST AND SAID SECOND DISTANCE RELAYS TO SAID DESENSITIZING MEANS, SAID ONE DISTANCE RELAY BEING EFFECTIVE IN RESPONSE TO A PREDETERMINED RELATIONSHIP OF THE SAID VOLTAGE AND CURRENT QUANTITIES SUPPLIED THERETO TO RENDER SAID SWITCH EFFECTIVE TO BE ACTUATED BY SAID CONTROL NETWORK.