Implementation and evaluation of commonly used risk analysis methods applied to a regional power distribution system

This paper describes risk management at the power distribution system of Gotland, the largest island in the Baltic Sea. Concerns regarding that existing risk management not suit all specific conditions initiated this study. The paper shortly describes some existing risk analysis methods that could be relevant to use and summarize and evaluate performed risk analyses. The results indicated two problems with current risk management: one related to analysis methods of regional power lines (70/30 kV) and the other on analysis methods used on substations. Existing methods was hence adjusted and these modified methods where then evaluated with satisfactory results.