Investigations of copper sulfide diffusion into paper insulation of transformers
Investigations of copper sulfide diffusion into paper insulation of transformers
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DOI：
10.1109/tdei.2016.7556521
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发表时间：
2016-09
影响因子：
3.1
通讯作者：
J. S. Rajan;S. Flora;C. Ranganathaiah
中科院分区：
文献类型：
--
作者：
J. S. Rajan;S. Flora;C. Ranganathaiah
硫化铜是由硫与变压器和电抗器中的铜导体发生反应而形成的。然而，很少有实验证据证明硫化铜扩散到大块纸中。对三种不同厚度的牛皮纸试样进行了扩散实验。正电子湮灭寿命光谱已被用于研究硫化铜扩散到大块纸张的可能性。本研究表明，硫化铜可以扩散到纸张中，导致纸张自由体积的增加或减少。阐述了硫化铜沉积引起纸张自由体积变化的原因。讨论了硫化铜扩散对放电特性、交流电压电流特性和体积电阻率的影响。电场模拟已经被用来解释铜离子和硫化铜的形成对纸上电应力分布的影响。
It is well established that copper sulfide is formed due to reaction of sulfur with copper conductors in transformers and reactors. However, there is very little experimental evidence to demonstrate copper sulfide diffusion into bulk of paper. Diffusion experiments have been carried out on three samples of kraft paper having different thickness. Positron Annihilation Lifetime Spectroscopy has been used to investigate the possibilities of copper sulfide diffusion into bulk of paper. This study has demonstrated that copper sulfide can diffuse into the bulk of paper leading to either increase or decrease in free volume of paper. The reasons for changes in free volume of paper due to copper sulfide deposits are explained. The consequences of copper sulfide diffusion on PD, voltage-current characteristics under ac and volume resistivity are discussed. Electric field simulation has been used to explain the effects of Cu ions and copper sulfide formation on electric stress distribution across paper.