L.S.P. E

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3Computers and electronic instru-ments are essential for process-ing various kinds of information in a high speed manner. How-ever, they are often subject to the induced energy caused by lightning, because of their gener-ally low dielectric strength.Lightning is a phenomenon in which negative electric charges generated in a thunderstorm dis-charge to the ground as a result of dielectric breakdown in the air. A lightning surge, even an indirect one, causes a surge voltage on the cable lines, and transmits a momentary high volt-age impulse to the sensors / transmitters in the field, or to the inputs of computers and instru-ments in the control room.

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