Approximation of the skin effect to improve cable-fault location by tdr

Abstract

A m The development of an dgorirhm for lhe pulse propngntion lime 10 lhefaulr on cnble nnd back lo rhe en@, faces hvo major problems which hove lo be solved: estimalion of representative poinls of Ihe reJ7ecled pulse with low sensilivily to noise and elim‘nnlion of lhe additionnl “measurement“ delay cnused by lhe skin effect. The pnper shows theprocedure of estimaling lhe slartpoint of the reflected pulse wilh the quadratic regression function. The start point hides also lhe delay caused by the skin effect, thus lhe correction, the curve of which is partly erponenlially shaped, should be subtracted from i t Non-linenrily decreases considernbly ifcompnred with the resulls wilhout correclion.