@article{KernKrichel2004,
  author    = {Kern, Alexander and Krichel, Frank},
  title     = {Considerations about the lightning protection system of mains independent renewable energy hybrid-systems - practical experiences},
  series = {Journal of electrostatics. 60 (2004), H. 2-4},
  journal   = {Journal of electrostatics. 60 (2004), H. 2-4},
  isbn      = {0304-3886},
  pages     = {257 -- 263},
  year      = {2004},
  language  = {en}
}
@article{KernKrichelNeskakisetal.2001,
  author    = {Kern, Alexander and Krichel, Frank and Neskakis, Apostolos and M{\"u}ller, Klaus-Peter (u.a.)},
  title     = {Lightning protection design of a renewable energy hybrid-system without power mains connection},
  year      = {2001},
  language  = {en}
}
@inproceedings{KernKrichelMueller2001,
  author    = {Kern, Alexander and Krichel, Frank and M{\"u}ller, Klaus-Peter},
  title     = {Lightning protection design of a renewable energy hybrid-system without power mains connection},
  year      = {2001},
  abstract  = {In the year 2000 a direct lightning strike to the hybridsystem without power mains connection VATALI on the Greek island Crete results in the destruction and damage of some mechanical and electrical components. The hybrid-system VATALI was not lightning protected at that time. The hardware damage costs are approx. 60,000 €. The exposed site of the hybrid-system on top of a mountain was and still is the reason for a high risk of lightning strikes. Also in the future further lightning strikes have to be taken into consideration. In the paper a fundamental lightning protection design concept for renewable energy hybrid-systems without power mains connection and protection measures against direct strikes and overvoltages are shown in detail. The design concept was realized exemplarily for the hybrid-system VATALI. The hardware costs for the protection measures were about 15,000 €. About 50\% of the costs are due to protection measures against direct strikes, 50\% are due to overvoltage protection. Future extensions, new installations, or modifications have to be included into the lightning protection design concept of the hybrid-system.},
  language  = {en}
}
@inproceedings{KernKrichel2002,
  author    = {Kern, Alexander and Krichel, Frank},
  title     = {Considerations about the lightning protection system of mains independent renewable energy hybrid-systems - practical experiences},
  year      = {2002},
  abstract  = {In the paper a lightning protection design concept for renewable energy hybrid-systems without power mains connection is described. Based on a risk analysis protection measures against direct strikes and overvoltages are shown in an overview. The design concept is realized exemplarily for the hybrid-system VATALI on the Greek island Crete. VATALI, not lightning protected at that time, was a victim of a lightning strike in the year 2000 causing destructions and damages of some mechanical and electrical components with costs of approx. 60.000 €. The hardware costs for the protection measures were about 15.000 €: about 50\% of the costs are due to protection measures against direct strikes, 50\% are due to overvoltage protection.},
  language  = {en}
}