New enhancements for cable fault location in complex medium voltage distribution networks

Even with ever improving cable technology and broadly adopted diagnostics tools, classic cable fault location applications remain a daily challenge for distribution grid operators. A benchmark study shows that operators face about 8 MV-faults per 1000 km line length every year. But cable fault location is by no means a basic routine job. “Every fault is unique!.” The adequate practical tools in terms of test technologies are available. Nine field proven methodologies for different fault types and network arrangements are described. A majority of faults can be found with a fairly standard procedure; however operators and testing professionals also need to cope with the extremes. The biggest challenge is not missing testing technology. New enhancements therefore focus on supporting users and organisations of powerful test equipment better. This means support not only for the specific measuring task but support a long the complete job from assignment to repair and final report. A practical case from winter cable fault location in the swiss alps illustrates the practical challenges.