The Behaviour of an Enhanced Earthing System of Transmission Voltage

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