Both stages were accomplished in the High Voltage
laboratory of Universiti Teknologi Malaysia (UTM) by
applying negative standard lightning impulse voltage (1.2/50
µs) from a 2MV, 20 stage Marx Generator. Negative voltages
were applied in all experiments to simulate a possible near to
real actual lightning discharge due to the descent of the
downward leader. This is due to the fact that most
thunderstorms accumulate an excess of negative charges in
their lower regions Thus, the polarity of the induced charges
on lightning rods, air terminals and other objects exposed to
the resulting electric fields at the Earth’s surface is usually
positive [2]