Lightning Impulse Breakdown Characteristics of Pure Water with Nitrogen Ultrafine Bubbles Using Pore Type Generator

Abstract

In our previous studies, we confirmed that the breakdown voltage did not decrease significantly even if nitrogen (N 2 ) fine bubbles were added to pure water. In addition, we confirmed that the conductivity of pure water increased when we used a metallic fine bubble generator. In this study, we investigated an influence of N 2 ultrafine bubbles on conductivity and breakdown voltage by using ceramic pore type generator. As a result, it was confirmed that addition of N 2 ultrafine bubbles to pure water may suppress the increase in conductivity. In addition, it was also confirmed that pure water with N 2 ultrafine bubbles tends to exhibit the 50% breakdown voltage equal to or slightly higher than pure water without N 2 ultrafine bubbles.