Surge arrester with a spark gap has been installed for protecting electric power apparatus from lightning surge in Japanese distribution system. A high - stable discharge characteristic is desirable by shorting the discharge time lag for the spark gap. The top and the bottom face of a ceramic spacer for sustaining the spark gap in a surge arrester contact with electrodes, of which the electric field becomes high. In this study, we performed V-t tests by applying the impulse voltage of 20-42 kV with 1.2/50 µs and measured the number of electrons per unit time against some spark gaps which differed in relative dielectric constant of a ceramic spacer. The higher relative dielectric constant contributed on raising electric field and forming corona discharge at the bottom face of the ceramic spacer, which increased the number of electrons and shortened the discharge time lag.
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