Broken conductor sensing device

Claim 1

A RELAYING SYSTEM FOR AN ELECTRICAL NETWORK COMPRISING A PAIR OF TERMINALS ADAPTED TO BE ENERGIZED AS A FUNCTION OF THE FREQUENCY COMPONENTS OF THE CURRENT IN SAID NETWORK, A FIRST TIMING NETWORK HAVING AN INPUT CIRCUIT AND AN OUTPUT CIRCUIT AND MEANS FOR ACTUATING ITS SAID OUTPUT CIRCUIT SOLELY AFTER ITS SAID INPUT CIRCUIT HAS BEEN ACTUATED FOR A PREDETERMINED TIME INTERVAL, A FILTER NETWORK INTERCONNECTING SAID TERMINALS AND SAID INPUT CIRCUIT, SAID FILTER NETWORK BEING EFFECTIVE TO PASS SOLELY CURRENT OF A NARROW FREQUENCY BAND, DISABLING MEANS FOR RENDERING SAID TIMING NETWORK INEFFECTIVE TO TIME OUT ITS SAID TIME INTERVAL, A SECOND TIMING NETWORK CONNECTED TO SAID DISABLING MEANS AND BEING EFFECTIVE TO DISABLE SAID FIRST TIMING NETWORK TO PREVENT THE TIMING OUT OF SAID FIRST TIMING NETWORK AS A CONSEQUENCE OF THE ENERGIZATION OF SAID TERMINALS WITH A CURRENT IN SAID FREQUENCY BAND UNTIL THE TIMING OUT OF SAID SECOND TIMING NETWORK.