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English: Solar eruptive events affect the close neighbourhood of the Earth.They also affect human infrastructure, power grids mainly, due to the inductionof electrical currents. Only recently the attention was drawn not only to largeflares, but also to estimate the long-term effects of increased solar activityby statistical methods. We analyse the failure rates in the main Czech powertransmission system operated by the Czech national operator \v{C}EPS. We showthat the effects of solar activity on failure rate in the main Czech power gridcannot be excluded even for central-european country. This is a preliminarystudy.  Czech: Eruptivn\'i projevy slune\v{c}n\'i aktivity ovliv\v{n}uj\'ibezprost\v{r}edn\'i kosmick\'e okol\'i na\v{s}\'i Zem\v{e} a postihuj\'iprost\v{r}ednictv\'im indukce elektrick\'ych proud\r{u} i pozemskouinfrastrukturu, zejm\'ena rozvodn\'e s\'it\v{e} silov\'e elekt\v{r}iny. Teprvev posledn\'ich letech byla v\v{e}nov\'ana pozornost nejen hodnocen\'ibezprost\v{r}edn\'ich dopad\r{u} siln\'ych eruptivn\'ich ud\'alost\'i naza\v{r}\'izen\'i rozvodn\'e s\'it\v{e}, ale tak\'e statistick\'emu zhodnocen\'ivlivu zv\'y\v{s}en\'e slune\v{c}n\'i aktivity. Ve spolupr\'aci s \v{C}EPS,a.s., jsme statisticky vyhodnotili \v{c}etnost z\'avad na za\v{r}\'izen\'ichp\'ate\v{r}n\'i rozvodn\'e s\'it\v{e} \v{C}R v z\'avislosti na \'urovnislune\v{c}n\'i aktivity a ukazujeme, \v{z}e vliv n\'ahl\'ych eruptivn\'ichud\'alost\'i na z\'avadovost za\v{r}\'izen\'i \v{c}esk\'e rozvodn\'e s\'it\v{e}nelze vylou\v{c}it.

Effects of solar activity on disturbances in Czech power grid: A preliminary assessment (in Czech only)