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Table 2 Electrical grids disruptions’ causes in southern Poland distribution network in 2010

From: Does time series analysis confirms the relationship between space weather effects and the failures of electrical grids in South Poland?

No. Specified reasons disruptions’ causes in 2010 Cluster Description of the cluster Number of failures % of failures
1 trees + plants A meteorological effects 1205 4.7
2 ice + rime + snow + frost 853 3.3
3 wind 134 0.5
4 atmospheric discharges 1461 5.7
    Total A 3653 14.26
5 planned breaks B operational shutdowns 3742 14.6
6 trial quick 4125 16.1
7 quick changeover 1977 7.7
8 repair > 3 min. 464 1.8
9 damage by the recipient on the MV 7 0.0
10 damage by an adjacent oper. 769 3.0
11 switch > 3 min. 5530 21.6
    Total B 16,614 64.86
12 digging C vandalism 620 2.4
13 animals 204 0.8
    Total C 824 3.22
14 aging, factory defects D aging 1917 7.5
15 power system protection automation errors E electronics devices 32 0.1
16 unidentified F unidentified 2576 10.1
    TOTAL 25,616 100.0