Critical grid event under investigation

摘要

A critical situation occurred in the Swiss transmission grid May 20 as significant overloading or threats of overloading occurred, Swissgrid said May 24. Event analysis showed that during a period of high domestic production (around 12 GW), a total of around 4.5 GW was exported, a large part to Germany, the TSO said. A full investigation would take several weeks it said. Load flows typically go in the other direction, from Germany to Switzerland. This atypical export and production situation led to “violations of grid security” (n and n-1), it said.