多次双极性振荡衰减冲击电压作用下的油纸绝缘累积效应  

Accumulative Effect of Repeated Damped Alternating Oscillation Voltage on Oil-paper Insulation

作　　者：司马文霞[1] 吴婧瑜 孙魄韬 华杰方 叶练 陈秋霖 SlMA Wenxia;WU Jingyu;SUN Potao;HUA Jiefang;YE Lian;CHEN Qiulin(State Key Laboratory of Power Transmission Equipment ＆ System Security and New Technology, Chongqing University, Chongqing 400030, Chin)

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室

出　　处：《高电压技术》2018年第6期1735-1740,共6页High Voltage Engineering

基　　金：国家自然科学基金(51707023);国家重点基础研究发展计划(973计划)(2015CB251003);国家重点研发计划项目(2017YFB0902702)~~

摘　　要：为研究电力变压器实际遭受的雷电冲击电压波和IEC规定的标准雷电冲击电压波（SLIW）对油浸绝缘纸累积作用,基于变电站实测的雷电侵入波形,通过试验方法产生了不同波形参数的双极性振荡衰减冲击电压,采用匝间绝缘模型模拟真实状况下油纸绝缘所承受的电场,并通过测量冲击电压幅值与冲击电压累积次数之间的关系特性和不同次数冲击电压作用前后相对介电常数等电气参数,探索了多次冲击电压作用对油纸绝缘的累积效应。研究表明：多次双极性振荡衰减冲击电压作用下油纸绝缘表现出明显的累积效应,在不同波形参数的冲击电压作用下油浸绝缘纸的U-N特性曲线均呈指数变化规律;在相同电压幅值下,油浸绝缘纸对双极性振荡衰减波的累积耐受能力比标准雷电冲击电压波更好,表明相同电压幅值下标准雷电冲击电压对绝缘的要求偏严;油浸绝缘纸的相对介电常数和介质损耗角正切值均随累积次数的增加呈明显上升趋势,表明多次双极性振荡衰减冲击电压作用对油纸绝缘性能有明显的影响。In order to study the accumulative effect of the lightning impulse voltage wave actually invading the power transformer and the standard lightning impulse voltage wave（SLIW） defined by the IEC on oil-paper insulation,based on the actual recorded invading lightning impulses in a substation, a damped alternating oscillation voltage was applied to the turn-to-turn insulation model which simulates the actual situation of insulation system in transformers. The U-N characteristics under impulse voltages were determined, and the electric parameters, such as relative dielectric constant, were measured before/after the accumulative tests. The experimental results showed an evident accumulative effect of the oil-paper insulation under multiple damped alternating oscillation impulse voltages. And the U-N characteristic curves of oil-paper insulating showed exponential variation under the impulse voltage of different waveform parameters. Meanwhile, the cumulative resistance of oil-paper insulation to damped alternating oscillation impulse voltage wave was superior to that of standard lightning impulse voltage wave under the same voltage amplitude, which indicated that the standard lightning impulse voltage wave had strict insulation requirements under the same voltage amplitude. Furthermore, both the relative dielectric constant and the dielectric loss factor of oil-paper insulation obviously increased with the increase of the accumulation times, which also showed that the effect of multiple impulse voltage on oil-paper insulation performance was obvious.

关 键 词：油纸绝缘 双极性衰减振荡冲击电压 累积效应 U-N特性 频域介电谱法 

分 类 号：TM855[电气工程—高电压与绝缘技术]