摘要
呋喃分子是油浸式变压器局部热故障时绝缘纸裂解的重要特征产物之一,变压器油中呋喃分子含量的检测是评估变压器运行状态的重要离线检测手段。为了明确绝缘纸中呋喃分子向植物油中的扩散过程及其与局部过热故障温度标签的对应关系,采用分子动力学的方法,研究了纳米尺度油-纸界面模型在室温(300 K)、低温过热(500 K)、中温过热(750 K)和高温过热(1000 K)条件下呋喃分子从绝缘纸向植物油中的扩散过程。结果表明:随着温度升高,油-纸绝缘中呋喃分子的扩散系数逐渐增大,而且从绝缘纸中扩散到植物油中的呋喃分子数量与温度密切相关。在300 K与500 K的条件下,鲜有呋喃分子扩散到植物油中;而在750 K和1000 K的条件下,部分呋喃分子扩散入植物油中,且温度越高,扩散到植物油中的呋喃分子数越多。上述仿真结果与油浸式变压器中、高温局部过热故障条件下可检测出呋喃族化合物的经验依据一致。
Furan molecule is one of the important characteristic products of insulating paper pyrolysis during local thermal failure of oil-immersed transformer,and the detection of furan molecules content in transformer oil is an important off-line testing method to assess the operating condition of transformer.In order to clarify the diffusion process of furan molecules from insulating paper to insulating oil and its correlation with temperature labels of local overheating fault,molecular dynamics methods were used to study the diffusion process of furan molecules from insulating paper to vegetable oil based on nanoscale oil-paper interface models under room temperature(300 K),low temperature overheating(500 K),medium temperature overheating(750 K),and high temperature overheating(1000 K).The results show that with the increase of temperature,the diffusion coefficient of furan molecules in oil-paper insulation increases gradually,and the number of furan molecules diffusing from insulation paper to vegetable oil changes closely with temperature.There are few furan molecules diffuse into vegetable oil under 300 K and 500 K.Under the temperature of 750 K and 1000 K,some of furan molecules diffuse into vegetable oil,and the molecule number increases with temperature.The above simulation results are consistent with the empirical basis that furan compounds can be detected in local overheating fault of medium and high temperature in oil-immersed transformers.
作者
徐冉
朱庆东
李健飞
李华强
王洋
XU Ran;ZHU Qingdong;LI Jianfei;LI Huaqiang;WANG Yang(State Grid Shandong Electric Power Company Electric Power Research Institute,Jinan 250001,China;School of Electronics and Information,Xi′an Polytechnic University,Xi′an 710049,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi′an Jiaotong University,Xi′an 710049,China)
出处
《绝缘材料》
CAS
北大核心
2024年第2期121-128,共8页
Insulating Materials
基金
陕西省自然科学基础研究计划面上项目(2021JM-450)
国网山东省电力公司科技项目(52062623000G)。
关键词
分子模拟
呋喃
油-纸绝缘
界面
扩散
molecular simulation
furan
oil-paper insulation
interface
diffusion
