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[1]郑殿春,张士江,李伟,等.纳秒脉冲电压下变压器油预击穿特性的仿真分析[J].电机与控制学报,2018,22(07):51-58.[doi:10.15938/j.emc.2018.07.007]
 ZHENG Dian-chun,ZHANG Shi-jiang,LI Wei,et al.Pre-breakdown characteristics in transformer oil undernanosecond impulses voltages[J].,2018,22(07):51-58.[doi:10.15938/j.emc.2018.07.007]
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纳秒脉冲电压下变压器油预击穿特性的仿真分析(PDF)
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《电机与控制学报》[ISSN:1007-449X/CN:23-1 408/TM]

卷:
22
期数:
2018年07
页码:
51-58
栏目:
出版日期:
2018-10-31

文章信息/Info

Title:
Pre-breakdown characteristics in transformer oil undernanosecond impulses voltages
作者:
 郑殿春1 张士江2 李伟3 李佳欣2 赵大伟1
 ( 1. 哈尔滨理工大学 工程电介质及其应用技术教育部重点实验室,黑龙江 哈尔滨 150080;2. 国网通辽供电公司,内蒙古 通辽 028000; 3. 国网北京市电力公司电力科学研究院,北京 100075)
Author(s):
 ZHENG Dian-chun1 ZHANG Shi-jiang2 LI Wei3 LI Jia-xin2 ZHAO Da-wei1
 ( 1. Key Laboratory of Engineering Dielectrics and Its Application,Ministry of Education Harbin University ofScience and Technology,Harbin 150080,China; 2. State Grid Tong Liao power supply company,Tongliao 028000,China;3. Electric Power Science Research Institute of Beijing Electric Power Company,Beijing 100075,China)
关键词:
变压器油 纳秒脉冲 极性效应 流注 空间电荷
Keywords:
 transformer oil nanosecond impulse polarity effect streamer net charge density
分类号:
TM 315
DOI:
10.15938/j.emc.2018.07.007
文献标志码:
A
摘要:
 以针—球电极间隙变压器油为研究对象,基于场致电离机理,建立用于表述液体电介质流注预放电过程中载流子的产生及输运的偏微分方程,结合电场泊松方程,以及热扩散方程,仿真研究纳秒脉冲电压下变压器油预击穿特性。得到了预击穿过程中电场强度随电压幅值、极性以及脉冲上升沿时间的变化规律。仿真结果表明: 流注速度随电压幅值的增大而增大; 负流注相比于正流注轴向传播距离小径向传播距离大; 负流注起始放电电压高于正流注,且起始速度大于正流注; 正脉冲上升沿时间越短所形成流注半径越大,上升沿时间大于 50 ns 的负脉冲条件下产生的流注易消散。本文的研究工作和取得的结论有助于加深对变压器油中放电起始、发展过程的认识以及对液体电介质放电机制的理解。
Abstract:
 Based on field ionizing mechanism,the mathematical model of the transformer-oil discharge inthe needle-sphere electrode system is established and the special dynamic behaviors of the charged-parti-cle generation,transportation and heated-diffusion during the discharge process are represented by thepartial differential equations and boundary constraint conditions,then the breakdown characteristics of thetransformer-oil dielectrics are achieved by the theoretical simulation under nanosecond impulse voltages.Modeling results show that streamer velocity of the transformer-oil dielectrics is increased with appliedvoltage amplitude increase,and the propagating distance of the negative streamer is less than that of thepositive streamer along the axial direction and extends much more than that of the positive streamer in ra-dial direction,and also the onset voltage of the negative streamer is higher than that of the positivestreamer. The shorter time of the wave front of the positive impulse voltage,the bigger radius of the streamer development,
then the streamer may be scattered and disappeared when raising time of the nega-tive impulse voltage is less than the 50ns. The achievements and suggestions of the research work in thispaper contribute to understand discharge mechanism of the liquid dielectrics,and have guiding signifi-cance for reasonably application and development liquid dielectrics in practice.

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备注/Memo

备注/Memo:
 收稿日期: 2016 - 09 - 13
基金项目: 国家自然科学基金( 51077032)
作者简介: 郑殿春( 1956—) ,男,教授,研究方向为电介质失效诊断、极端条件下气/液体放电现象;
张士江( 1989—) ,男,硕士,研究方向为极端条件下气 /液体放电现象;
李 伟( 1980—) ,男,硕士,研究方向为电力设备故障诊断;
李佳欣( 1991—) ,女,硕士,研究方向为变压器主绝缘;
赵大伟( 1965—) ,男,副教授,研究方向为高压电气绝缘技术。
更新日期/Last Update: 2018-09-28