A voltage-dependent non-linear resistor for a lightning arrester with spark gap, and a method for its production

摘要

PURPOSE:To obtain a voltage nonlinear resistor which can reduce the length of the current limiting element section of a surge arrester and is excellent in dynamic current cutting-off property, lightning surge discharge withstand current, etc., by making the resistor to contain a total of 11 kinds of metal oxides including bismuth oxide, cobalt oxide, manganese oxide, etc., and specifying various discharge voltage characteristics of the resistor. CONSTITUTION:This voltage nonlinear resistor for capped surge arrester contains 0.5-1.2 mole % (Bi2O3 equivalent) of bismuth oxide, 0.3-1.5 mole % (Co2O3 equivalent) of cobalt oxide, 0.1-0.8 mole % (MnO2 equivalent) of manganese oxide, etc., and has such various characteristics that the discharge voltage at a current density of 0.1A/cm2 is 250-350V/mm unit thickness of a sintered body, discharge voltage ratio V0.1A/V0.1mA at current densities of 0.1A/cm2 and 0.1mA/cm2 is 1.2-1.7, and the discharge voltage dropping ratio at a current density of 0.1A/cm2 before and after a lightning surge current (4/10mus waveform) of 5kA/cm2 is impressed twice is =3%.