Improved algorithm of fault location on overhead power lineand high voltage cable hybrid line
CHEN Mingjun，CHEN Yiping，LIAN Xinkai
（College of Information Engineering , Zhejiang University of Technology, Hangzhou 310023, China）
Abstract: In order to improve the accuracy of fault location on overhead power line and high voltage cable hybrid, and solve the problem of pseudo roots,  an improved algorithm of fault location on hybrid line by twoterminal asynchronous information was proposed. Based on distributed parameter hybrid line model,  the cause of pseudo roots in the fault location was analyzed, binary search to avoid pseudo roots was improved ,  the improved algorithm  was used to locate fault, and  the results and autoreclosing technology were cooperated. Accordingly,  the safety and reliability of the power system were improved. Matlab simulation results show that the fault location algorithm does not be affected of pseudo roots, transition resistance, fault type, fault position and asynchronous angle, and it shows that the fault location algorithm is fast and accurate.
Key words: fault location; hybrid line; pseudo roots; reclosing