The study of voltage-current characteristic of lightning impulse to the metal-oxide varistor

Abstract

This project studies the voltage-current (V-I) characteristic of lightning impulse to the metal-oxide varistor (MOV). MOV is widely used in the low voltage equipment for protection from lightning surge. This surge, produce an extra current which will propagates from transmission line along to the low voltage equipment. From this project, lightning impulse current is injected to the designed modelling of MOV to test its capability to withstand the surge current. In this project, MOV of manufacturer ‘Littlefuse’ is selected. In order to familiar with the project, study on behaviour of lightning impulse and V-I characteristic of MOV is vital. Powersim (PSIM) software has been used in modelling and testing. From the simulation, comparison of V-I characteristic is obtained.