Journal article

Models of wind-turbine main-shaft bearings for the development of specific lightning protection systems

One of the main causes of damages for wind-turbine power plants is lightning. Direct and indirect events, indeed, can produce damages and malfunctions of electrical and mechanical components. Concerning mechanical components, blades and bearings are the most involved parts. In particular, lightning damages to main-shaft bearings can result in high costs of maintenance, due to the inherent burden in the replacement of these components. The paper focuses on the modeling of wind-turbine main-shaft bearings. Two models are presented and experimentally validated: one numerical and one analytical, both conceived in a way to make the calculation of the bearing electrical impedance possible. The paper shows how these models are helpful for the design of wind-turbines lightning protection systems (LPSs). In this respect, it illustrates the criteria for the design of such an LPS and assesses the validity of design solutions by means of experimental tests. © 2010 IEEE.

    Keywords: Bearings ; lightning ; lightning protection systems (LPSs) ; wind turbine ; Design solutions ; Electrical impedance ; Experimental test ; High costs ; Lightning protection systems ; Main-shaft ; Mechanical components ; Turbine power plants ; Bearings (structural) ; Design ; Lightning protection ; Wind power ; Wind turbines ; Bearings (machine parts)


    Department of Electrical Engineering, University of Bologna, Bologna 40136, Italy Department of Electrical Engineering, University of Rome, Rome 00185, Italy TERNA, Rome 00198, Italy

    Cited By (since 1996): 1

    Export Date: 25 April 2012

    Source: Scopus

    Art. No.: 5617264


    doi: 10.1109/TEMC.2010.2052462

    Language of Original Document: English

    Correspondence Address: Napolitano, F.; Department of Electrical Engineering, University of Bologna, Bologna 40136, Italy; email:

    References: Cotton, I., Jenkins, N., Pandiaraj, K., Lightning production of wind turbines blades and bearings (2001) Wind Energy, 4, pp. 1-5. , Nov; Sorensen, T., Jensen, F.V., Raben, N., Lykkegaard, J., Saxov, J., Lightning protection for offshore wind turbines (2001) Proc. CIRED 16th Int. Conf. Exhib. Electricity Distrib. (IEE Conf. Publ. No. 482), 4, pp. 1-5. , Jun. 18-21; Kern, A., Krichel, F., Considerations about the lightning protection system of mains independent renewable energy hybrid-systems-practical experiences (2004) Journal of Electrostatics, 60 (2-4), pp. 257-263. , DOI 10.1016/j.elstat.2004.01.003, PII S0304388604000178; Celi, O., Pigini, A., Evaluation of damage caused by lightning current flowing through bearing (1994) Proc. of the IEA: Lightning Protection of Wind Turbine Generator Systems and EMC Problems in the Associated Control System, pp. 85-94. , Cologno Monzese, Milan, Italy, Mar. 8-9; Fajdigaa, G., Glodežb, S., Kramara, J., Pitting formation due to surface and subsurface initiated fatigue crack growth in contacting mechanical elements (2007) Wear, 262, pp. 1217-1224; (2002) Wind Turbine Generator Systems-Part 24: Lightning Protection, , IEC TR 61400-24; Sorensen, T.S., Plumer, J.A., Montanìa, J., Krogh, T.H., Hermoso, B., Birki, J., Gehlhaar, T., Politis, Z., The update of IEC 61400-24 lightning protection of wind turbines (2008) 29th Int. Conf. Lightning Prot., , ICLP, Uppsala, Sweden, Jun. 23-26; (1990) Protection of Structure Against Lightning-Part 1: General Principles, , IEC 61024-1; (1993) Protection of Structure Against Lightning-Part 1: General Principles- Section 1:Guide A: Selection of Protection Levels for Lightning Protection Systems, , IEC 61024-1-1; (1998) Protection of Structures Against Lightning-Part 1: General Principles- Section 2: Guide B: Design, Installation, Maintenance and Inspection of Lightning Protection Systems, , IEC 61024-1-2; (1995) Protection Against Lightning Electromagnetic Impulse-Part 1: General Principles, , IEC 61312-1; (1999) Protection Against Lightning Electromagnetic Impulse (LEMP)-Part 2: Shielding of Structures, Bonding Inside Structures and Earthing, , IEC 61312-2; (2000) Protection Against Lightning Electromagnetic Impulse (LEMP)-Part 3: Requirements of Surge Protective Devices (SPDs), , IEC 61312-3; (1998) Protection Against Lightning Electromagnetic Impulse-Part 4: Protection of Equipment in Existing Structures, , IEC 61312-4; (1995) Assessment of the Risk of Damage Due to Lightning, , IEC TR 61662; (2006) Protection Against Lightning-Part 1: General Principles, , IEC 62305-1; (2006) Protection Against Lightning-Part 2: Risk Management, , IEC 62305-2; (2006) Protection Against Lightning-Part 3: Physical Damages to Structures and Life Hazard, , IEC 62305-3; (2006) Protection Against Lightning-Part 4: Electrical and Electronic Systems Within Structures, , IEC 62305-4; (1995) Insulating Liquids-Determination of the Breakdown Voltage at Power Frequency-Test Method, , IEC 60156; Dowson, D., Higginson, G.R., (1977) Elasto-Hydrodinamic Lubrification, , London, U.K.: Pergamon; (1994) Modeling Guide, , FEMLAB, Sweden: Comsol AB


    Record created on 2012-05-01, modified on 2016-08-09


Related material