Analysis of Wind Turbine Grounding Systems In Terms of Touch and Step Voltages

Power generation from renewable resources is increasingly growing. The numbers of wind turbines and wind farms are increasing as well. Wind turbines and wind farms require grounding systems in order to protect the living creatures and turbine components from fault current and lightning current. This study uses grounding systems consisting of conductors and electrodes with different and asymmetric depths of embedment as well as a non-homogenous two-layer soil model. By employing this model, it examines the effect of the reinforcement of the grounding system of a wind turbine on the step and touch voltages. Then, it examines the grounding system of a wind farm consisting of several wind turbines.

Keywords:

Touch voltage, step voltage, wind turbine grounding,

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IEEE Guide for Safety in AC Substation Grounding, IEEE Std. 80-2000.
CYMGRD User Guide and Reference Manual, Canada, 2000.
M. Lorentzou, N. Hatziargyriou and B. Papadias, “Analysis of Wind Turbine Grounding Systems”, 10th Mediterranean Electrotechnical May.Vol. 3, pp. 936-939, 2000. Athens, Greece, 29-31
I. Cotton, “Windfarm Earthing”, Proc. International Symposium on High Voltage Engineering, Vol. 2, pp. 288- 291, London, UK, 1999.
N. Hatziargyrious, M. Lorentzou, I. Cotton, and N. Jenkins, “Transferred Overvoltages by Windfarm Grounding Systems,” Proceedings of ICHQP conference, Athens, Greece, 1998.
S. D. Jacimovic, “Maximum Permissible Values of Step and Touch Voltages with Special Consideration to Electrified Railroads,” IEEE Transactions on Industry Applications, Vol. Ia-20, No. 4, July-August 1984.
C. H. Lee, A. P. S. Meliopoulos, “Comparison of touch and step voltages between IEEE Std. 80 and IEC 479-1”, IEE Proceedings of Generation. Transmission and Distribution, Vol. 146, No. 5, pp. 593–601, 1999.
C. F. Dalziel, and W. R. Lee, “Reevaluation of Lethal Electric Currents,” IEEE Transactions on Industry AndGeneral Applications, Vol. Iga-4, No. 5, September- October 1968.
A. Esmaeilian, A. A. S. Akmaland M. S.Naderi, “Wind Farm Grounding Systems Design Regarding the Maximum Permissible Touch & Step Voltage”, Environment and Electrical Engineering International Conference, Tehran, Iran, 18-25 May 2012.
Çağrı Köksal was born in 1987 in