Method of measuring the distance of a fault on a line taking account of distributed capacitances

摘要

The invention concerns a method of direct measurement of a parameter characterizing a fault on an electricity line 1, such as the distance x or the resistance Rd of the fault, the method being based on Ohm's Law including the line inductance L and the resistances R, Rd. The signals respectively associated with the variation of current i(t) and of voltage v(t) at the measuring point M are operated upon by transfer functions the ratio of which is equal to: (2/ tau ) tan omega tau /2, tau corresponding to the propagation time of a wave over double the distance between the measuring point M and a zone boundary P. The method thus takes into account the distributed capacitances C of the line.