1. Frankfurt (Germany), 6-9 June 2011 1 Currents in power line wood poles Mats Wahlberg, Sarah Rönnberg Luleå University of Technology, Sweden Wahlberg – SE – S2 – 0347

2. Frankfurt (Germany), 6-9 June 2011 2 Fault must exist: conductor has fall off or broken insulator Wahlberg – SE – S2 – 0347

3. Frankfurt (Germany), 6-9 June 2011 3 Accident in 2008 aug Wahlberg – SE – S2 – 0347

4. Frankfurt (Germany), 6-9 June 2011 4 Model U line I tot I resistor R1R1 R2R2 R= 3kΩ R3R3 I pole R foot R hand R 3 = 0 Ω Wahlberg – SE – S2 – 0347

5. Frankfurt (Germany), 6-9 June 2011 5 Wahlberg – SE – S2 – 0347

6. Frankfurt (Germany), 6-9 June 2011 6 Model HAND FOOT 3kΩ Wahlberg – SE – S2 – 0347

7. Frankfurt (Germany), 6-9 June 2011 7 Voltage over a 3kΩ resistor when moved along a wooden pole Wahlberg – SE – S2 – 0347

8. Frankfurt (Germany), 6-9 June 2011 8 Wahlberg – SE – S2 – 0347 Current over a 3kΩ resistor when moved along a wooden pole

9. Frankfurt (Germany), 6-9 June 2011 9 Exampel of power line Wahlberg – SE – S2 – 0347

10. Frankfurt (Germany), 6-9 June 2011 10 Lack of knowledge Wahlberg – SE – S2 – 0347  Existing values in wood poles Resistance  Different behaviour depending on weather and kind of treatment Impregnation Much more  Weather dependence Wind Rain Sun Temperature

11. Frankfurt (Germany), 6-9 June 2011 11 Future Wahlberg – SE – S2 – 0347  Existing standard SS-EN 14229:2010  Electrical parameters for power line poles  Changes of chemicals

12. Frankfurt (Germany), 6-9 June 2011 12 Thank you