Apparatus for detecting the location of an electric line fault including means for comparing the voltage and current of the line

Claim 1

APPARATUS FOR DETECTING THE LOCATION OF A FAULT ALONG AN A.C. TRANSMISION LINE COMPRISING A FIRST MEANS FOR PRODUCING A D.C. VOLTAGE CORRESPONDING TO THE RECTIFIED CURRENT OF THE LINE, A SECOND MEANS FOR PRODUCING A D.C. SIGNAL CORRESPONDING TO THE RECTIFIED VOLTAGE OF THE LINE, A FIRST STORAGE MEANS SUPPLIED FROM SAID FIRST MEANS FOR STORING SAID D.C. VOLTAGE, A SCOND STORAGE MEANS SUPPLIED FROM SAID SECOND MEANS FOR STORING SAID D.C. SIGNAL, AN INTEGRATOR SUPPLIED FROM SAID FIRST STORAGE MEANS, A SWITCH FOR STARTING SAID INTEGRATOR, A DETECTOR SENSING THE VOLTAGE LEVEL TO WHICH SAID FIRST STORAGE MEANS IS CHARGED, SAID SWITCH BEING RESPONSIVE TO SAID LEVEL DETECTOR TO SAID SAID INTEGRATOR WHEN SAID VOLTAGE LEVEL ATTAINS A PREDETERMINED VALUE, A SECOND SWITCH BETWEEN THE AFOREMENTIONED SECOND MEANS AND SECOND STORAGE MEANS, SAID SECOND SWITCH BEING CONTROLLED BY SAID VOLTAGE LEVEL SENSING DETECTOR TO INTERRUPT SAID D.C. SIGNAL SUPPLIED TO THE SECOND STORAGE MEANS WHEN SAID VOLTAGE LEVEL OF PREDETERMINED VALUE OCCURS, A COMPARATOR FOR COMPARING SIGNALS RECEIVED FROM SAID INTEGRATOR AND SECOND STORAGE MEANS, A LOCAL GENERATOR, GATE MEANS CONNECTED BETWEEN THE LOCAL GENERATOR AND A MEASURING DEVICE, THE OPENING OF SAID GATE MEANS FOR CONDUCTION OF THE OUTPUT SIGNAL FROM SAID LOCAL GENERATOR BEING CONTROLLED BY THE SAID FIRST SWITCH AND ITS CLOSING FOR INTERRUPTION OF SAID LOCAL GENERATOR OUTPUT SIGNAL BEING CONTROLLED BY SAID COMPARATOR.