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Table 3 Electrical grids disruptions’ causes in southern Poland distribution network in January–July 2014

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 2014 Cluster Description of the cluster Number of failures % of failures
1 storm A meteorological effects 5195 17.2
2 ice + snow + rime 124 0.4
3 rime 197 0.7
4 rime + tree + branch 271 0.9
5 snow 154 0.5
6 snow + tree + branch 30 0.1
7 wind 1272 4.2
8 wind + tree + branch 1761 5.8
    Total A 9004 29.8
9 protection devices B operational shutdowns 1065 3.5
10 switching 3800 12.6
11 planned breaks 3924 13.0
12 another operator 337 1.1
13 works of own brigades 38 0.1
14 open object 193 0.6
15 closed object 160 0.5
16 at the recipient 69 0.2
17 in order to save people 1 0.0
18 switching activities 6 0.0
19 assembly defects 110 0.4
    Total B 9703 32.0
20 charges, theft, disassembly C vandalism 410 1.4
21 cutting down trees/other parties 132 0.4
22 fire 105 0.3
23 digging 145 0.5
    Total C 792 2.6
24 aging D aging 3135 10.4
25 local impairment of insulation 3074 10.2
    Total D 6209 20.6
26 fuse E electronics devices 1 0.0
27 power system protection automation and telemechanics 1178 3.9
28 secondary circuits and power 2 0.0
    Total E 1181 3.91
29 unidentified F unidentified 3266 10.8
    TOTAL 30,155 100.0