- Merkebu Zenebe Degefa
- WP2 Lead
- SINTEF Energi AS
Single line to ground-fault locations method developed and tested in simulation
Challenge and objective
- Unlike short circuit faults, there has not been a well-established method for detecting and locating single line to ground (earth) faults in isolated systems.
- Development and test of earth fault location method for ungrounded distribution networks. The method shall be cost effective, simple to implement and its accuracy shall not be affected by variation in measurement inaccuracy, load situation, fault resistance etc.
- Two novel current based methods for locating earth faults in isolated closed ring operating MV networks were developed.
- The methods are based on utilising zero and negative sequence current during fault on ring connected feeders.
- The performance of the methods were investigated by conducting multiple simulation tests considering variation in measurement inaccuracies, load, fault resistance, and other parameters.
- During the simulation tests, both methods showed good accuracy. The maximum distance error were in the range of few hundred meters.
- The impact of measurement inaccuracy, load asymmetry and fault resistance were minimal.
Impact for distribution system innovation
- The simulation results were promising and strengthens the prospect of further testing of the methods in real networks and adoption of the methods for a real-world implementation.
Reference in CINELDI
- T.A. Zerihun, T. Treider, H. Taxt, L.B. Nordevall, T.S. Haugan: "Two novel current-based methods for locating earth faults in unearthed ring operating MV networks", submitted to ELSEVIER/EPSR 2021, and under review.