Birch, Stewart, Kolasch & Birch, LLP
Method and apparatus for detecting fault in a mixed configuration power transmission line
A method and an apparatus for fault detection in a mixed configuration power transmission line including a plurality of sections arranged between one end of the transmission line and the other end of the transmission line and including at least one overhead line section and at least one cable section are disclosed. Based on a comparison travelling wave voltage or current time derivatives at the one end and the other end of the power transmission line with selected threshold values, it is determined if there is a fault occurring in at least one cable section of the power transmission line. Embodiments utilize amplification of travelling wave voltages and/or currents which may occur at junctions between a cable section and an adjacent overhead line section in determining if the fault occurs in a cable section of the power transmission line.
ABB SCHWEIZ AG
G G H H H H H
G01R G01R H02H H02H H02H H02H H02H
inventional inventional inventional inventional inventional inventional inventional
YouYi Arkadiusz Reynaldo Jianping Jiuping
Li Burek Nuqui Wang Pan