Abstract
<span>This paper describes tests results on the CF<sub>3</sub>I-CO<sub>2</sub> gas mixtures as an alternative for SF<sub>6</sub> gas as to be used as insulating medium in high voltage applications. Pressurized CF<sub>3</sub>I-CO<sub>2</sub> gas mixtures are subject under standard lightning impulse voltages at both positive and negative polarities</span><span>. Under rod-plane configuration, the electrode gap length and gas pressure are varied accordingly. Upon completion of the laboratory tests, SEM and EDX analyses are carried out to assess the solid by-products. It was found that higher gas mixtures provide better insulation strength. In terms of weight, 50% of the solid by-product is found to be iodine.</span>
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