Experimental investigations were carried out to study the effect of humidity on the breakdown of rod-plane gaps subjected to both unidirectional and bi-directional oscillatory switching impulse voltages. The humidity ranged from $14.1 - 36 gm/m^3$ at a constant temperature of 40' C. The gap subjected to uni-directional 6.3, 10, lQ kHz and bi-directional 4.2, 10,20 kHz oscillatory switching impulse voltages. The gap distance was varied from 8 to 30 cm. The experiments were carried out in a controlled atmospheric room. The results indicate an increase in breakdownstrength with increase in humidity. The results are of great relevance at atmospheric conditions existing in Tropical countries.
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