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This paper presents the results of a condition based maintenance system using a new fault location technique based on voltage dip measurements. Hydro-Québec (HQ) named this system MILES for Maintenance and Investigation of LIneS. The technique used was presented in previous CIRED publications in 2007 and 2011 as the Voltage Drop-based Fault Location (VDFL) technique. So far, the MILES system has shown a very good potential for permanent and temporary-fault location on overhead radial distribution system and has been deployed on 40 feeders located mainly at HQ and also at two other Canadian utilities.

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