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A great proportion of the extended electricity distribution network (20/0.4 kV) failures in Greece can be considered as lightning related. This paper examines the overvoltage surges, affecting crucial elements of the distribution system of Patras, Greece. Two scenarios were discussed. The first suggests that, the medium and low-voltage networks share the same grounding system and the second that,...
Solid-State Transformers (SSTs) are a promising technology since they combine a high efficiency with the integration of new functionalities and services in the grid. A SST establishes the interface between a MV AC three-phase grid and a LV AC or DC grid. For this reason a SST is subject to electrical stresses due to faults occurring in the grid. The MV and LV grids are in return exposed to failures...
Data on unscheduled electric service interruptions in an extended distribution network (20/0.4 kV) were analyzed in order to examine the causes contributing to distribution substation failures. A distribution substation feeding a Global System for Mobile Communications base station experienced the highest service interruption rate due to transformer sustained failures, the vast majority of which were...
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