直流电压下变压器油纸绝缘局部放电的发展过程

发布时间：2018-06-23 16:01

本文选题：换流变压器 + 油纸绝缘　；参考：《高电压技术》2014年02期

【摘要】：研究变压器油纸绝缘局部放电(PD)的发展过程对于特高压换流变压器的运行维护十分重要。为此,对典型油纸复合绝缘缺陷模型在直流电压长期(100 h)作用下的局部放电信号进行了统计分析;根据其统计特征图谱,将直流局部放电发展过程划分为4个阶段。此外,还采用无感电阻测量直流局部放电单个脉冲波形;并对直流电压长期作用下的油浸绝缘纸板表面形貌变化进行了观测。试验结果表明,直流电压下的局部放电脉冲的上升沿在10～100 ns范围内,首脉冲持续时间约500 ns,其余振荡脉冲脉宽在600～900 ns范围内;估算得出单次直流放电脉冲能量在0.01～0.1 J范围内。此外,研究发现绝缘纸板的表面会在针电极电蚀作用下产生"凹坑",这为实现基于多信息融合的直流局部放电发展趋势预测奠定了基础。
[Abstract]:It is very important to study the development process of oil-paper insulation partial discharge (PD) for UHV converter transformer. For this reason, the partial discharge signal of typical oil-paper composite insulation defect model under the action of DC voltage for a long time (100 h) is statistically analyzed, and the development process of DC partial discharge is divided into four stages according to its statistical characteristic map. In addition, the single pulse waveform of DC partial discharge was measured by non-inductive resistance, and the surface morphology of oil-immersed insulating paperboard under the long-term action of DC voltage was observed. The experimental results show that the rising edge of partial discharge pulse at DC voltage is in the range of 10 ~ 100 ns, the duration of the first pulse is about 500 ns, and the pulse width of the other oscillating pulses is in the range of 600 ~ 900 ns. It is estimated that the pulse energy of a single DC discharge is in the range of 0.1 J. In addition, it is found that the surface of insulating paperboard will produce "pits" under the action of electroetching of needle electrode, which lays a foundation for the prediction of DC partial discharge development trend based on multi-information fusion.
【作者单位】：清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室;西安交通大学电力设备电气绝缘国家重点实验室;国网电力科学研究院;国家电网公司;
【基金】：国家重点基础研究发展计划(973计划)(2011CB209400) 国家电网公司科技项目(编号略)~~
【分类号】：TM855.1

【参考文献】