A Humidity-Control Method for Preventing Insulation Failure in Surge Protectors. - Etsuko Toyoda; Morihiko Matsumoto; Tomoyuki Fujita; Kenichi Shioi; Kazuaki Yano; Masamitsu Watanabe; Toshihiro Ichino; Yoshimori Miyata; Nobuo Kuwaki (IEICE Trans. Commun., 2006)