TY - JOUR N2 - The paper presents investigations of microstructure of varistors of damaged surge arrester counters. A similar ZnO varistor, not subjected before to operation, was a point of reference in this research. The results of investigations of the ZnO varistors show an untypical phase composition of their material, which was characterized by unsatisfying homogeneity and cohesion. The degradation processes of varistor material in the subsequent stages were recognized and described. A harmful impact of humidity inside the untight surge arrester counter on its operation and its ZnO varistors was proved. Some conclusions being the result of the operation checking of surge arrester counters were presented too. L1 - http://journals.pan.pl/Content/110150/PDF/AMM-2019-1-28-Rachanowski.pdf L2 - http://journals.pan.pl/Content/110150 PY - 2019 IS - No 1 EP - 196 DO - 10.24425/amm.2019.126237 KW - surge arrester counter KW - ZnO varistors KW - microstructure of ceramics KW - ceramic material degradation A1 - Papliński, P. A1 - Wańkowicz, J. A1 - Ranachowski, P. A1 - Ranachowski, Z. PB - Institute of Metallurgy and Materials Science of Polish Academy of Sciences PB - Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences VL - vol. 64 DA - 2019.03.14 T1 - Investigation of microstructure of ZnO varistors taken from surge arrester counters SP - 191 UR - http://journals.pan.pl/dlibra/publication/edition/110150 T2 - Archives of Metallurgy and Materials ER -