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Analyzing the nonuniformity of electrical parameters of ZnO varistors is useful to select and coordinate the ZnO varistors in parallel operation to increase the protection capability of ZnO varistors. The nonuniformity of 1[mA] DC voltage and impulse residual voltage in ZnO varistors for commercial low- and high-voltage were estimated by a statistic analysis in this paper. The relative standard deviations of 1[mA] DC voltages ZnO varistors for low-voltage and rugh-voltage were 1.98[%] and 4.10[%], respectively. The respective relative standard deviations of impulse residual voltages were 2.24[%] and 3.14[%], respectively. For the distribution of 1[mA] DC voltage and impulse residual voltage, results in ZnO varistors for low- and high-voltage agreed well with the Minimum Gobble Distribution according to the Kolmogorov-Smirnov test. A close relation between the impulse residual voltage and 1[mA] DC voltage was verified by both the t-test and another test method, and the impulse residual voltage could be estimated by a voltage ratio and 1[mA] DC voltage. The current overload of ZnO varistor with reduced residual voltage was not serious at the tested deviation range by simulation analysis, therefore, there was no problem for these varistors operating in parallel.

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Abstract

Ⅰ. Introduction

Ⅱ. Experiments

Ⅲ. Nonuniformity of 1mA DC Voltages

Ⅳ. Nonuniformity of Impulse Residual Voltages

Ⅴ. Relation of 1mA DC Voltage and Impulse Residual Voltage

Ⅵ. Nonuniformity of Voltage Ratio

Ⅶ. Effect of Nonuniformity to Currents Through ZnO Varistors in Parallel

Ⅷ. Conclusions

References

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UCI(KEPA) : I410-ECN-0101-2009-569-017766451