Fault locating means for electric power transmission lines, having means for recording, reproducing and displaying transmitted and reflected signals

Claim 1

AN ELECTRICAL APPARATUS FOR ACCURATELY DETERMINING THE DISTANCE AT WHICH A FAULT IN A POWER TRANSMISSION LINE OCCURS SUBSTANTIALLY IMMEDIATELY AFTER THE OCCURRENCE OF A FAULT AS INDICATED BY A FAULT-OCCURRENCE SINAL WHICH APPEARS ACROSS A CIRCUIT BREAKER CONNECTED TO SAID LINE, COMPRISNG MEANS PRODUCING A FIRST SET OF SIGNAL COMPRISING A PLURALITY OF DISCRETE EQUALLY SPACED APART BURSTS OF OSCILLATIONS FOR A PREDETERMINED TIME IN RESPONSE TO THE RECEIPT OF SAID FAULT-OCCURRENCE SIGNAL, CONNECTING MEANS COUPLED TO SAID CIRCUIT BREAKER APPLYING SAID FIRST SET OF SIGNAL TO SAID POWER TRANSMISSION LINE, SAID CONNECTING MEANS BEING RESPONSIVE TO A CHANGED CONDITION OF SAID CIRCUIT BREAKER TO PROVIDE A CONTROL CONDITION OF SAID CIRCUIT BREAKER TO PROVIDE A CONTROL SIGNAL, BIASED GATING MEANS FOR ELECTRICALLY DECOUPLING SAID FIRST PRODUCING MEANS FROM SAID TRANSMISSION LINE IN THE ABSENCE OF SAID CONTROL SIGNAL, MEANS FOR RECEIVING A REFLECTED SET OF SIGNALS FROM SAID TRANSMISSION LINE, MEANS FOR RECORDING SAID FIRST SET OF SIGNALS AND THE REFLECTED SET OF SIGNAL ON A RECORDING MEDIUM, MEANS FOR REPRODUCING SAID SIGNAL FROM SAID RECORDING MEDIUM AT A FIRST RATE TO PRODUCE OUTPUT SIGNALS REPRESENTING THE RECORDED FIRST SET OF SIGNALS AND THE RECORDED REFLECTED SET OF SIGNALS, MEANS FOR DISPLAYING SAID OUTPUT SIGNALS ON A SCANNING DISPLAY DEVICE AT A PREDETERMINED SCAN RATE, SAID SCAN RATE AND SAID FIRST RATE BEING CORRELATED SO THAT A PREDETERMINED NUMBER OF SAID BURSTS OF SAID FIRST SET OF REPRODUCED AS PAIRED STATIONARY IMAGES.