氧化鋅變阻器突波吸收能力研究

A Study on the Capability of Surge Absorption for Zinc Oxide Varistors

林澤義(T.Y. Lin) ； 馮政寧(C.N. Feng) ； 邱寬城(K.C. Chiu) ； 邱文卿(W.C. Chiu)

《中原學報》 26卷3期 (1998/08) Pp. 9-15

https://doi.org/10.6358/JCYU.199808.0009

摘要

本文在探討氧化鋅變阻器經突波侵襲後所產生之劣化現象。實驗結果顯示，氧化鋅變阻器受突波侵襲後，會產生崩潰電壓降低，非歐姆指數值減小，以及漏電流增加等劣化現象。如果所受的突波為單一極性，則受突波侵襲後之樣品的I-V曲線呈現不對稱性，亦即正向劣化程度低於反向劣化程度。因此應用在交流電路之劣化情況會較直流電路嚴重。本文對此提出對策。再者，因為反向漏電流的增加率變化較大，所以是表達劣化過程比較適合的參數。由此發現過度加長燒結時間有加速劣化的趨勢。此外，受突波侵襲而劣化的樣品，在500℃經4小時，或在950℃經1小時熱處理後，多能恢復原來特性。

關鍵字

氧化鋅變阻器 ； 突波 ； 劣化 ； 反向漏電流

並列摘要

The degradation of zinc oxide varistors after stressed by surges is studied. It is found that after stressed by surges the varistors show a decrease in both break-down voltage and nonlinear exponent, and an increase in leakage current. If the pulses are of the same polarity, the I-V curve of varistor will become asymmetric, i.e., the positive degradation is less than the negative degradation. Hence, the degradation will be more serious in ac circuit application. To solve this problem a solution is proposed by this paper. Furthermore, it shows that the fractional increament of reverse leakage current, due to its large variation, is a preferable parameter to represent the degree of degradation. Accordingly, the degree of degradation is observed to enhance if the period of the sintering process is too long. In addition, most of the degradated varistors after stressed by surges can be recovered to their original characteristics after annealed at 500°C for 4 hours or at 950°C for 1 hour.

並列關鍵字

zinc oxide varistor ； surge ； degradation ； reverse leakage current.