Corrosive Sulfur Induced Failures in Oil-Filled Electrical Power Transformers and Shunt Reactors
Corrosive Sulfur Induced Failures in Oil-Filled Electrical Power Transformers and Shunt Reactors
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DOI：
10.1109/tpwrd.2008.2005369
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发表时间：
2009-06
影响因子：
4.4
通讯作者：
F. Scatiggio;V. Tumiatti;R. Maina;M. Tumiatti;Massimo Pompili;R. Bartnikas
中科院分区：
文献类型：
--
作者：
F. Scatiggio;V. Tumiatti;R. Maina;M. Tumiatti;Massimo Pompili;R. Bartnikas
分析了油浸式变压器和并联电抗器中硫腐蚀性故障的性质和原因。矿物油中的腐蚀性硫与铜导体反应时形成的硫化铜很可能扩散到绝缘导体的纸带中。由于硫化铜是部分导电的，因此受污染的油浸纸带的介电损耗显著增加;发现即使在室温下，靠近铜导体的纸带的tan δ值也大于1.0。在工作温度下，这些位置极有可能出现热不稳定性，导致损耗电流增加，最终导致匝间短路。这一系列事件得到了现场证据的证实，现场证据表明，沿线圈沿着存在大面积的热退化绝缘和烧焦击穿区域，其程度在较高的工作温度下变得更加明显（朝向绕组顶部）。
The nature and causes of corrosive sulfur induced failures are examined in oil-filled transformers and shunt reactors. Copper sulfide, which is formed when the corrosive sulfur in a mineral oil reacts with the copper conductors, is likely to diffuse into the paper tapes insulating the conductors. Since copper sulfide is partially conducting, the dielectric losses of the contaminated oil-impregnated-paper tapes are markedly increased; paper tapes in close proximity to the copper conductors are found to attain tan delta values > 1.0 even at room temperature. It is highly likely that thermal instabilities develop at those sites at operating temperatures, leading to increased loss currents and, ultimately, short circuits between the turns. This sequence of events is substantiated by evidence from the field, which indicates large areas of thermally degraded insulations and charred breakdown regions along the coils, the extent of which becomes more pronounced at higher operating temperatures (toward the top of the windings).