Franklin rods - sharp or blunt?

• Autorzy: Chrzan K. L.
• Konferencja: II International Conference on Advances in Processing, Testing and Application of Dielectric Materials, September, 15-17, 2004, Wrocław
• Języki publikacji: EN

Abstrakty

EN

This paper gives the historical background of 250 year old question: should the Franklin rod tip be sharp or blunt ? The earlier works, the new field results from USA and own laboratory experiments are presented. The switching impulse tests were carried out with two different shapes of high voltage electrodes: rod or sphere and without additional dc bias voltage. In the arrangement with rod as high voltage electrode the smaller breakdown voltages were measured with sharp grounded electrode with negative impulse polarity. At the positive polarity the breakdown voltages do not depend on the shape of grounded electrode. The tests with spherical high voltage electrode showed, that breakdown voltages under negative polarity are practically the same for three different grounded electrodes. In spite of that, the remarkable differences in time to breakdown were noted.

Słowa kluczowe

EN

lightning rod; protection zone; breakdown voltage

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje
• Rocznik: 2004
• Tom: Vol. 40, nr 15
• Strony: 217--220
• Opis fizyczny: Biblogr. 10 poz., rys., tab.

Twórcy

autor

Chrzan K. L.

• Wrocław University of Technology, Poland

Bibliografia

• [1] CHRZAN K.L. History of lightning protection in Poland. Int. Conf. on Lightning Protection, Cracow 2002
• [2] GOLDE R.H. Lightning, Academic Press 1977, Vol. 1, chapter 1, Prinz H. Lightning in history, p. 44
• [3] SZPOR S. Zakończenie przeciwulotowe dla zwodu pionowego. Polish patent no. 63945, 15. Jan 1972
• [4] GOLDE R.H., The validity of lightning tests with scale models. The Journal of the Institution of Electrical Engineers. part II (Power Engineering) April 1941, pp. 67-68
• [5] CARRARA G., THIONE L., Switching surge strength of large air gaps: a physical approach. IEEE Trans. on Power Apparatus and Systems, March/April 1976, pp. 512-524
• [6] SZPOR S., WIŚNIEWSKI A., Series of impulse tests showing the efficacy of the surface terminals of lightning rods. Archiwum Elektrotechniki, no 4, 1970, pp. 749-755
• [7] AKYUZ M., COORAY V., The Franklin lightning conductor: conditions necessary for the initiation of a connecting leader. Journal of Electrostatics 51-52 (2001) pp. 319-325
• [8] MOORE C.B., Aulich G.D., Rison W., The case for using blunt-tipped lightning rods as strike receptors. Journal of Applied Meteorology, July 2003, pp. 984-993
• [9] JAKUBOWSKI J.L., Wpływ świetleń na strefę chronioną piorunochronów prętowych. Archiwum Elektrotechniki, no 1-2, 1953, s. 165-175
• [10] ALLEN N.L., EVANS J.C., New investigations of the early streamer emission principle. IEE Proc. on Science Measurement Technology, Sept. 2000, pp. 243-248