Research on Sensing and Detection Characteristics of Insulation Miscellaneous Items of Power Transformers in Practical Applications
张瑞 ZHANG Rui
（重庆大学电气工程学院，重庆 400000）
（School of Electrical Engineering，Chongqing University，Chongqing 400000，China）
摘要：油浸式电力变压器内油中溶解气体的含量直接影响着高压绝缘装置的绝缘性能，实现变压器内油中溶解微量气体（H2，C2H2，CO 及 CH4）的可靠检测对于高压绝缘装置及电网安全至关重要。在本研究中，对长期在电网中运行的油浸式电力变压器利用密度泛函理论研究了过渡金属 Zn 原子掺杂的 S 空位 SnS2 单层（Zn-SnS2）敏感材料对 4 种油浸式变压器中油中溶解气体的传感吸附行为。结果表明：用于油浸式电力变压器油中溶解杂项的传感材料在线监测导带和价带结构得到了有效优化（由 1.550 eV 变为 0.127eV），掺杂体系下不同带隙和电导率的吸附体系将有助于提高新型二维 SnS2 基气敏材料对油浸式电力变压器油中溶解气体的选择性，为实现电力变压器油中溶解气体的可靠检测提供了一种新的思路。
Abstract: The content of dissolved gases in the oil of the oil immersed power transformers affects the insulation performance of the high-voltage insulation devices directly. The realization of the reliable detection of dissolved trace gases (H2, C2H2, CO, and CH4) in the oil of the transformer is crucial for the safety of high-voltage insulation devices and power grids. In this study, density functional theory was used to investigate the sensing and adsorption behavior of S-vacant SnS2 monolayer (Zn-SnS2) sensitive material doped with transition metal Zn atoms on dissolved gases in oil in four types of oil immersed power transformers that have been operating in the power grid for a long time. The results indicate that the sensing material online monitoring of conduction and valence band structures of the dissolved impurities in oil immersed power transformer oil has been effectively optimized (from 1.550eV to 0.127eV), and the adsorption system with different band gaps and conductivities under doping system will help improve the selectivity of the new two-dimensional SnS2 based gas sensing material for dissolved gases in oil immersed power transformer oil, providing a new idea for reliable detection of the dissolved gases in power transformer oil.
关键词：油浸式电力变压器；油中溶解气体；传感检测；S 空位 SnS2；在线监测
Key words: oil immersed power transformer；the dissolved gases in the oil；sensing detection；S-vacant SnS2；online monitoring
中图分类号：TM41 文献标识码：A 文章编号：1006-4311（2024）27-112-06 doi:10.3969/j.issn.1006-4311.2024.27.033
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