%0 Journal Article %T 极不均匀场中振荡型雷电冲击电压下 变压器油击穿特性研究<br>Breakdown Characteristics of Transformer Oil under Oscillating Lightning Impulse in a Highly Non？？Uniform Electric Field %A 林春耀 %A 靳宇晖 %A 张哲铭 %A 李军浩 %A 周丹 %A 杨贤 %A 梁文进 %J 西安交通大学学报 %D 2017 %R 10.7652/xjtuxb201712018 %X 针对目前振荡型冲击电压和标准冲击电压的等效性研究尚不成熟的问题,采用100、300、400 kHz的正极性振荡型雷电冲击电压(OLI)和标准雷电冲击电压(SLI)进行对比,以间距为5 mm的针尖和球体作为电极,研究了极不均匀场中变压器油在振荡型雷电冲击电压下的击穿特性,记录了这3种频率的振荡型雷电冲击电压和标准雷电冲击电压的击穿波形,统计并分析了不同雷电冲击电压下的伏秒特性、起始击穿电压和最大击穿时延。结果表明:振荡型冲击电压下的变压器油击穿后会产生一定的振荡,需串接电阻抑制;标准雷电冲击电压的变压器油击穿点主要分布在波峰处,而振荡型雷电冲击电压的击穿点在每个振荡周期的峰值处都有分布;振荡型冲击电压的起始击穿电压随频率升高而上升,最大击穿时延随频率的升高而缩短,但比标准雷电冲击电压长。该研究为现场对变压器进行振荡型冲击耐压试验奠定了基础。<br>To reveal the equivalence between oscillating impulse voltage and standard impulse voltage (SIV) and the breakdown characteristics of transformer oil in a highly non？？uniform electric field under oscillating lightning impulse, three positive oscillating lightning impulse(OLI) waveforms with oscillating frequency of 100, 300 and 400 kHz are adopted as the test waveforms to compare with the standard lightning impulse (SLI) and a 5 mm？？distance point？？ball structure serves as the electrode. Waveforms of these three kinds of OLI and SLI are recorded and the V？？t characteristics, minimum breakdown voltage and breakdown maximum time lag in different lightning impulse are counted and analyzed. The results show that for a large oscillation of the breakdown waveforms under OIV, it is necessary to connect a resistance in series to restrain; the breakdown points distribute near the peak of wave under SLI while they distribute near the peaks in every period of oscillation under OLI; the minimum breakdown voltage under OIV increases with the increasing frequency but the maximum breakdown time lag decreases with the increasing frequency and lasts longer than SLI %K 击穿特性 %K 振荡型冲击电压 %K 变压器油 %K 极不均匀场< %K br> %K breakdown characteristics %K oscillating impulse voltage (OIV) %K transformer oil %K highly non？？uniform electric field %U http://zkxb.xjtu.edu.cn/oa/DArticle.aspx?type=view&id=201712018