摘要
电容型高压套管作为变电站内极为重要的电力设备之一,其绝缘状态对电力系统的安全稳定运行至关重要。套管在生产和运行过程中,可能因干燥不充分、浸渍不充分或外部水分入侵而受潮,影响绝缘可靠性。由于套管电容芯子绝缘结构的特殊性,水分通常为非均匀分布,在外界水分侵入时尤为明显。文中通过建立油纸绝缘双单元叠层和110 kV电容型套管数值仿真模型,对其在不均匀受潮状态下的频域介电谱特性进行仿真分析。结果表明:不均匀受潮时,介质损耗因数与频率的关系曲线出现明显的介质损耗峰;水分分布不均匀程度增大时,损耗峰对应的频率随之增大;频域介电谱(FDS)对套管厚度和末屏局部的含水量变化敏感,但基本不受套管轴向不均匀受潮的影响。
Capacitive high-voltage bushing is one of the most important power equipment in substations,and their insulation status is very important for safe and stable operation of the power system.During the production and operation,insufficient drying or impregnation and ingress of external moisture may result in the humidified and unreliable insulation of bushings.Due to the particularity of the structure of the bushing,moisture is usually unevenly distributed in the capacitor core,especially in the case of external moisture intrusion.Therefore,a numerical simulation model of oil-paper-insulated double-unit laminated and 110 kV capacitor bushing is established.Frequency domain spectroscopy(FDS)characteristics under non-uniform moisture conditions are simulated.The results show that when the moisture is uneven,the tanδ-f curve shows obvious dielectric loss peaks.The frequency corresponding to the loss peaks goes up with the increase of the unevenness of moisture distribution.The FDS is sensitive to the insulation thickness and the moisture content in the final screen,and is basically not affected by the uneven axial moisture of the bushing.
作者
刘伟
李洋
张璐
牛朝滨
穆海宝
张冠军
LIU Wei;LI Yang;ZHANG Lu;NIU Chaobin;MU Haibao;ZHANG Guanjun(State Grid Shaanxi Electric Power Company,Xi′an 710048,China;State Key Library of Electrical Insulation and Power Equipment(Xi′an Jiaotong University),Xi′an 710049,China;State Grid Shaanxi Electric Power Company Research Institute,Xi′an 710199,China;State Grid Xiongan New Area Power Supply Company of Hebei Electric Power Co.,Ltd.,Baoding 071800,China)
出处
《电力工程技术》
2020年第6期143-150,共8页
Electric Power Engineering Technology
基金
国家自然科学基金委员会-中国工程物理研究院联合基金资助项目(U1830129)。
关键词
油纸绝缘
电容型高压套管
COMSOL仿真
频域介电谱(FDS)
不均匀受潮
oil-paper insulation
capacitive high voltage bushing
COMSOL simulation
frequency domain spectroscopy(FDS)
non-uniform damp condition
