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首页> 外文期刊>Electricity Today >INVESTIGATING COPPER SULFIDE CONTAMINATION IN A FAILED LARGE GSU TRANSFORMER
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INVESTIGATING COPPER SULFIDE CONTAMINATION IN A FAILED LARGE GSU TRANSFORMER

机译：研究大型GSU变压器中的硫化铜污染

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摘要

Let's examine the details of the teardown and laboratory investigation of a failed GSU transformer. The failure involved sulfide contamination of the copper conductor and copper sulfide in the associated paper insulation in the upper third portion of the failed winding. The theory is put forth that a combination of time and temperature and corrosive sulfur in the oil created conditions to exist in the transformer that caused this problem despite the oil having passed the standard test criteria for corrosive sulfur. Although the mechanism is still unclear, copper ions migrate to the insulating paper adjacent to the conductor, react with corrosive sulfur compounds, and cause a reduction in dielectric strength. At some point, the voltage being carried by the conductor exceeds the insulating capacity of the paper insulation and BIL rating of the transformer. The result is arcing between two or more disks and a subsequent burn through (failure).
机译：让我们检查一下故障GSU变压器的拆卸细节和实验室调查。该故障涉及故障绕组上部第三部分相关的纸绝缘层中铜导体和硫化铜的硫化物污染。提出了一种理论，即时间和温度的组合以及机油中的腐蚀性硫磺会导致变压器中存在条件，尽管该机油已经通过了针对腐蚀性硫磺的标准测试标准，但仍导致了该问题。尽管机理尚不清楚，但铜离子会迁移到与导体相邻的绝缘纸上，并与腐蚀性的硫化合物发生反应，并导致介电强度降低。在某些时候，导体承载的电压超过了纸绝缘的绝缘能力和变压器的BIL额定值。结果是在两个或多个磁盘之间产生电弧，并随后烧穿（故障）。

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