Abstract
The nonlinear electrical properties and aging characteristics against surge stress of ZPCCL-based varistors were investigated for different sintering temperatures of the range <TEX>$1240-1300^{\circ}C$</TEX>. As the sintering temperature increased, the varistor voltage decreased from 732.2 to 53.8 V/mm, the nonlinear exponent decreased from 58.5 to 4.1, and the leakage current increased from <TEX>$0.38{\mu}A$</TEX> to <TEX>$46.5{\mu}A$</TEX>. The varistors sintered at <TEX>$1250^{\circ}C$</TEX> and <TEX>$1260^{\circ}C$</TEX> exhibited the high stability against multiple surge, <TEX>$150A/cm^2(8{\times}20{\mu}s)$</TEX>. On the whole, the variation rate of electrical characteristics against impulse current stress was gradually increased in order of varistor voltage<TEX>$\rightarrow$</TEX>nonlinear exponent<TEX>$\rightarrow$</TEX>dissipation facto<TEX>$\rightarrow$</TEX>leakage current.
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