高电压技术2017，Vol.43Issue(12)：3827-3834,8.DOI:10.13336/j.1003-6520.hve.20171127003
双极性振荡衰减冲击电压作用下油浸绝缘纸的绝缘累积效应特性
Accumulative Effect Characteristics of Oil-impregnated Paper Insulation Under Damped Alternating Oscillation Voltage
摘要
Abstract
In the life cycle,oil-paper insulation in power transformers will suffer from repetitive lightning impulse,which is a serious threat to the safe operation of the transformer.Due to the influence of factors such as attenuation,reflection,and winding resonance of the lightning impulse voltage of the transformer,the intrusion waveform has the oscillation attenuation and bipolarity.The waveform differs greatly from the standard lightning waveform specified by IEC.In this paper,based on the actual recorded invading lightning impulses in a substation,damped altemating oscillation voltage was applied to the column-to-column insulation model.The characteristics of relationship between the amplitude of applied voltage and the accumulative number of times (U-N characteristics) under damped alternating oscillation voltages were determined.To study the accumulative damage effect,the surface morphology was observed,and the electric parameters,such as relative dielectric constant,were measured before/after the accumulative tests.As a result,the experimental results showed an evident accumulative effect of oil-impregnated paper insulation under multiple damped alternating oscillation voltages.Ivory colloidal attachments can be found on the samples within the electrode covering area and the surface roughness of samples increases.Also,both the relative dielectric constant and the dielectric loss factor obviously increase with the increasing of accumulation times.关键词
油浸绝缘纸/双极性衰减振荡冲击电压/累积效应/U-N特性/表面形貌/频域介电谱法Key words
oil-impregnated paper insulation/damped alternating oscillation voltage/accumulative effect/U-N characteristics/surface morphology/frequency domain dielectric spectroscopy引用本文复制引用
司马文霞,吴婧瑜,华杰方,孙魄韬..双极性振荡衰减冲击电压作用下油浸绝缘纸的绝缘累积效应特性[J].高电压技术,2017,43(12):3827-3834,8.基金项目
国家重点基础研究发展计划项目(973计划)(2015CB251003) （973计划）
国家重点研发计划(2017YFB0902702) （2017YFB0902702）
国家自然科学基金(51707023).Project supported by National Basic Research Program of China(973 Program) (2015CB251003),National Key R&D Program of China (2017YFB0902702),National Natural Science Foundation of China (51707023). （51707023）
