摘要
换流变压器阀侧绕组复杂的工作电压环境及其绝缘优劣情况对电力系统运行可靠性的影响,决定了研究交、直流复合场下变压器油纸绝缘局部放电发展过程的实用价值。通过对复合电场针板模型下油纸绝缘系统放电发展过程的研究,经过多次重复性实验发现复合场下局部放电相位分布在各个时间段内存在明显差异。根据交、直流电压的自身特点,从外施电压提供电能、静电场力做功实现能量转换的角度构建数学模型,得出如下结论:交流电压是放电集中于45°和225°附近的根本原因;直流电压在放电发展过程中加强了外在电能和电势能的转化,从而为各相位发生放电提供了可能。
Due to the influence of complicated working voltage condition and insulation status of the wiring at the valve side of conversion transformer on the operation reliability of power system,it is useful to study the phase distribution of the needle-plate model in the evolution of partial discharge in oil-paper insulation under combined AC-DC electric field.Based on repeated experiments,both the differences and similarities of phase distribution among different test periods can be found.According to the characteristics of the AC and DC voltage,the mathematical model is built from point of view of the energy conversion,from which such conclusions as the follows can be obtained：the discharge distribution close to 45°and 225°is caused by the AC voltage;The DC voltage strengthens the conversion of electrical energy and potential energy during discharging development,which makes discharging of each phase possible.
出处
《现代电力》
2010年第6期1-6,共6页
Modern Electric Power
基金
国家电网公司技术项目
关键词
复合电场
油纸绝缘
局部放电
相位分布
数学模型
electric field under combined AC-DC voltage
oil-paper insulation
partial discharge
phase distribution
mathematical model
