摘要
换流变压器的阀侧绝缘主要承受交直流复合电压,这种电压所引起的局部放电与纯交流或纯直流电压所引起的明显不同。基于流体动力学漂移-扩散方程和双极性电荷传输方程的仿真模型能反映电场强度和电荷密度的分布,所以局部放电的产生和发展能被有效描述。该文首先用实验结果验证仿真理论的可行性,然后建立纸板因电老化而存在凹陷的仿真模型,并先后施加多种交直流复合电压。不仅研究了沿面放电在凹陷中的形成和发展过程,还探讨了瞬时电压、几何参数、电压比例和介电常数等因素的变化对局部放电的影响。对沿面放电的研究能部分揭示换流变压器阀侧局部放电的物理过程和影响因素,有利于绝缘结构的优化和沿面放电机理的进一步研究。
The insulation on the rectifying valve side of converter transformer is mainly subjected to composite AC-DC voltages, and the partial discharge(PD) caused by this type of voltage is obviously different from that caused by pure AC or DC voltage. The simulation model based on hydrodynamic drift-diffusion equations and bipolar charge transfer equations can reflect the distribution of electric field strength and charge density, thus the generation and development of PD can be effectively described. In this paper, the experimental results were used to verify the feasibility of the simulation method, then the simulation model in which the paperboard had a depression due to the electrical aging was established and a variety of composite AC-DC voltages were applied successively. Not only the process of creeping discharge formation and development in the depression were studied, but also the effects of changes in factors such as instantaneous voltage, geometric parameters, voltage proportions, and dielectric constants on the PD were explored. The research on the creeping discharges could partially reveal the physical process and influencing factors of PD at the rectifying valve side of converter transformer, which was conducive to the optimization of the insulation structure and the further research on the creeping discharge mechanism.
作者
刘洪顺
薛志通
李斯盟
李清泉
何东欣
王冠
武宏斌
LIU Hongshun;XUE Zhitong;LI Simeng;LI Qingquan;HE Dongxin;WANG Guan;WU Hongbin(Shandong Provincial Key Laboratory of UHV Transmission Technology and Equipment(Shandong University),Jinan 250061,Shandong Province,China;Electric Power Research Institute of State Grid Jiangsu Electric Power Co.Ltd,Nanjing 211103,Jiangsu Province,China;State Key Laboratory of Electrical Insulation and Power Equipment(Xi'an Jiaotong University),Xi'an 710049,Shaanxi Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第18期6461-6471,共11页
Proceedings of the CSEE
基金
国家电网公司总部科技项目(52060020002P)。
关键词
换流变压器
油纸绝缘
沿面放电
电压比例
介电常数
converter transformer
oil-paper insulation
creeping discharge
voltage proportion
dielectric constant
