Automatic fault location for underground low voltage distributionnetworks

摘要

This paper describes an automatic fault location technique fornpermanent faults in underground LV distribution networks (ULVDNs). Itnuses signals from an existing time domain reflectometry (TDR)ninstrument. It pre-processes TDR signals to eliminate reflections due tonsingle-phase tee-offs, and to locate 3-phase open or short circuitnfaults and also uses adaptive filtering to compare the TDR signals tonlocate faults. In essence, the procedure minimizes the interpretationnskill required from a user of a typical TDR based fault locationninstrument. The relative performance of the system is demonstrated usingnreal field data