Lightning strikes pose a major challenge to the safety of high voltage transmission and distribution lines. During a lightning strike a very high voltage is produced which can destroy the insulation and damage power systems. Not only are lightning strikes bad for power systems but also pose a serious threat to human life in the vicinity of electricity tower by increasing potential of the soil. Therefore, an effective lightening protections system is needed to cater those above mentioned problems. The effectiveness of a lightening protection system can be deduced by judging the earth connection of the system. Numerous and national standards are in place to help design a protection system that satisfy conditions necessary for the safety of both system and personnel. In this paper, the performance of a full scale 220kV & 500kV transmission tower base is investigated under DC, AC variable frequency and low and high impulse voltages and some of the values of Enhanced Earthling System are simulated through a MATLAB Program.
Electrical Engineering UET, Peshawar,
Electrical Engineering UET, Peshawar Haseeb Khan: Electrical Engineering UET, Peshawar,
Noor Hussain Amjad Khattak Haseeb Khan
- AIEE Committee Report:Lightning Performance of 110- to 165-Kv Transmission Lines,�AIEE Transactions, vol. 58, pp. 249-306, 1939.
- Dwarka Prasad, H.C.Sharma," Significance of Step and Touch Voltage "International Journal of Soft Computing and Engineering (IJSCE) Volume-1, Issue-5, November 2011, pp.193-197.
- Towne H. M. �Impulse characteristics of driven grounds � General Electric Review, vol. 31, No. 11, pp. 605-609, 1928.
- Bellaschi P. L., Armington R. E. and Snowden A. E.�Impulse and 60-cycle characteristics of driven grounds-II� AIEE Transactions, vol. 61, pp. 349-363, 1942.
- A. L. Vainer and V. N. Floru: �Experimental study and method of calculation of the impulse characteristics of deep earthings, Elecktrichestvo�, vol. 2, No. 5, pp. 18-22, 1971.
- Bewley L. V.: �Theory and tests of the counterpoise �AIEE Transactions, vol. 53, No. 8, pp. 1163-1172, 1934.
- Geri A. and Garbagnati E. �Non-linear behaviour of ground electrode under lightning currents: computer modelling and comparison with experimental results�, IEEE Transactions on Magnetics, vol. 28,pp. 1442-1445, March 1992.
- Experimental Investigation of Impulse Characteristics of Transmission Line Tower Footings N. Harid* , H. Griffiths, N. Ullah, M. Ahmeda and A. Haddad.
- Sonoda Toshio, HidemiTakesus and ShozoSekioka, �Measurement on surge characteristics of grounding resistance of counterpoise for impulse currents�International Conference on Lightning Protection (ICLP), September 2000.
- Vanlint V. A. J. and J. W. Erler, �Electric breakdown of earth in coaxial geometry � IEEE Transactions on Nuclear science, vol. NS-29, No. 6, pp. 1891-1896, 1982.
- Srisakot S., H. Griffiths and A. Haddad, �Soil ionisationmodelling under fast Impulse� Proceedings of the 36th Universities Power Engineering Conference (UPEC), UK, 2001.
- D. P. Snowden, G. C. Morries, Jr. and V.A.J. Van Lint: �Measurement of the dielectric constant of soil� IEEE Transmissions on Nuclear Science, vol. NS-32, No. 6, pp. 4312-4314, 1985.