Abstract
One of the most important insulating gases in high-voltage technique, the air, is varying with climatic conditions. The most important parameters are the pressure, temperature and the absolute humidity. The influence of humidity on the discharges is investigated in this report. First, the physical processes on the discharge development are discussed in respect to the influence of water vapour in air. Experimental results of the breakdown voltage with variable absolute humidity are explained with these processes. The experimental investigation was done with a rod-plane gap of 20 cm to 100 cm distance and with different voltage wave shapes. The different influence of water vapour on different predischarge phenomena can be seen in different dependency of the breakdown voltage on the absolute humidity, for each type of predischarge dominating before breakdown.
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