The invention discloses a
wavelet transform and time search strategy based double-end traveling wave fault location method for
hybrid power transmission line. The method comprises the following stepsof 1) determining an electrical topological structure of the
hybrid power transmission line MN; 2) acquiring the motion time of traveling
waves on a section line according to the length and motion
wave speed of each section line; 3) according to fault traveling wave information acquired by traveling wave distance measuring devices at the two ends of the line, adopting
wavelet transform to detect and identify the moment when the fault traveling wave moves to each
bus measuring end for the first time so as to obtain a
time difference when the traveling wave arrives at the two ends of the
bus, and calculating t1 an t2 according to formulas by combining movement time of the fault traveling wave on the whole
power transmission line; and 4) starts comparing from the end M of the
bus, judging that the fault position is behind the xj1 section when t1>deltat1, and judging that the fault position is on the xd1 section when deltat1<t1<deltat1+deltat2, thus calculating the fault position. The method can be used to identify the initial traveling wave of a fault more accurately, and effectively solve the problem in fault
distance measurement of the cable and
overhead line hybrid power
transmission line of the power
system.