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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