公开(公告)号：US3612989A

公开(公告)日：1971-10-12

申请号：US3612989D

申请日：1969-02-20

Applicant: COMPTEURS COMP D

Inventor： SOUILLARD MICHEL HENRY PIERRE ,  FONTENY MICHEL LOUIS

IPC: G01R27/16 ,  G01R31/08 ,  H02H3/40

CPC classification number: G01R31/085 ,  G01R27/16 ,  G01R31/08 ,  H02H3/40 ,  H02H3/402

Abstract: A process for measuring the distance of a fault between phases and the earth of an electric power transport line where one effects, at the moment when the faulty current takes a zero value, the ratio between the voltage of the faulty loop at the measuring point and a reference voltage representing the voltage drop equivalent to a faulty current in a given length of the loop in question. A device for measuring the distance of a fault between phases or the earth comprising means for elaborating a reference voltage representing a voltage drop equivalent to a faulty current in a given length of the faulty loop at the measuring point means for detecting the moment when the faulty current passes by a zero value, means for remembering the value at this moment of the voltage of said loop and the reference voltage, and means for effecting the ratio of these two voltages.