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浙江大学学报(工学版)
浙江大学学报(工学版)  2019, Vol. 53 Issue (2): 399-406    DOI: 10.3785/j.issn.1008-973X.2019.02.024
电气工程     
采用瞬态上流元法的油纸绝缘瞬态电场研究
连启祥1(),杜志叶1,*(),金硕1,杨知非1,黄国栋2,阮江军1
1. 武汉大学 电气与自动化学院, 湖北 武汉 430072
2. 广东电网有限责任公司电力调度控制中心, 广东 广州 510600
Study of transient electric field of oil-paper insulation with transient upstream finite element method
Qi-xiang LIAN1(),Zhi-ye DU1,*(),Shuo JIN1,Zhi-fei YANG1,Guo-dong HUANG2,Jiang-jun RUAN1
1. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China
2. Electric Power Dispatch and Control Center of Guangdong Power Grid Co. Ltd, Guangzhou 510600, China
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摘要：

作为换流变压器的主要绝缘材料，油纸复合材料的绝缘特性受内部空间电荷的影响. 在极性反转电压下，介质内部积聚电荷产生附加场强，可能使局部电场明显增强，从而更易引起绝缘击穿. 基于瞬态上流有限元数值方法，引入界面势垒模型，计算极性反转条件下单层油浸纸、油浸纸-油双层绝缘结构内部空间电荷的运动特性以及瞬态电场随时间的变化规律，并与试验得到的规律进行对比验证. 仿真结果表明：在直流电压下，介质内部积聚的电荷无法快速消散，将对反转瞬间的电场产生叠加作用，引起电极附近场强最大程度畸变. 双层介质的界面阻碍效应产生的界面积聚电荷，导致在极性反转瞬间油中电场瞬时增大. 研究结果可为换流变压器油纸绝缘特性和击穿场强研究提供参考.
关键词： 油纸复合绝缘;  瞬态上流元法;  电荷积聚;  极性反转;  电场畸变    
Abstract:

The insulation property of oil-paper composite material, as main insulation material of converter transformer, is influenced by internal space charges. Under polarity reversal voltage, the accumulative charges inside the insulation will produce additional field strength and significantly enhance the local electric field, which tends to cause insulation breakdown. The interfacial barrier model was adopted based on the transient upstream finite element method (TUFEM), and the charge motion characteristics and transient electric field under polarity reversal in single-layer oil-impregnated paper and two layers of oil-impregnated paper and oil were calculated. The simulation results were compared with the experiment results to verify applicability of the numerical method. Results showed that internal accumulative charges formed under direct current voltage were unable to dissipate quickly, which had a superposition effect on electric field at the instant of polarity reversal, causing the maximal electric field distortion near the electrodes. The accumulative charges at the interface due to interfacial blocking effect will lead to sudden increase in electric field of oil. The conclusion can provide reference for the study of oil-paper insulation characteristic and breakdown strength.
Key words: oil-paper insulation    transient upstream finite element method    charge accumulation    polarity reversal    electric field distortion
收稿日期: 2018-01-18 出版日期: 2019-02-21
CLC:  TM 854  
通讯作者: 杜志叶     E-mail: leventlqx@126.com;duzhiye@126.com
作者简介: 连启祥（1993—），男，硕士生，从事电磁场数值计算研究. orcid.org/0000-0002-0533-6916．E-mail： leventlqx@126.com
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连启祥
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阮江军

引用本文:

连启祥,杜志叶,金硕,杨知非,黄国栋,阮江军. 采用瞬态上流元法的油纸绝缘瞬态电场研究[J]. 浙江大学学报(工学版), 2019, 53(2): 399-406.

Qi-xiang LIAN,Zhi-ye DU,Shuo JIN,Zhi-fei YANG,Guo-dong HUANG,Jiang-jun RUAN. Study of transient electric field of oil-paper insulation with transient upstream finite element method. Journal of ZheJiang University (Engineering Science), 2019, 53(2): 399-406.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.02.024    或    http://www.zjujournals.com/eng/CN/Y2019/V53/I2/399

图 1  载流子传输、复合和入陷模型
图 2  上流有限元示意图
参数 单位 数值
电子迁移率μe m2/(V?s) 1×10?14
空穴迁移率μh m2/(V?s) 1×10?14
电子陷阱捕获系数Be s?1 5×10?3
空穴陷阱捕获系数Bh s?1 5×10?3
电子陷阱浓度Net0 C/m3 100
空穴陷阱浓度Nht0 C/m3 100
复合系数（自由电子/入陷空穴）Seμ,ht m?3?C?1?s?1 5×10?2
复合系数（入陷电子/自由空穴）Set,hμ m?3?C?1?s?1 5×10?2
复合系数（自由电子/自由空穴）Seμ,hμ m?3?C?1?s?1 0
复合系数（入陷电子/入陷空穴）Set,ht m?3?C?1?s?1 5×10?2
电子肖特基注入势垒ωei eV 1.1
空穴肖特基注入势垒ωhi eV 1.1
温度T K 293.2
油相对介电常数εi ? 2.5
油浸纸相对介电常数εop ? 3.5
表 1  油纸绝缘材料仿真参数设置
图 3  极性反转电压波形
图 5  单层油浸纸在路径1上的电荷密度分布仿真结果与试验结果对比
图 6  极性反转下单层油纸内部电荷及电场分布
图 4  单层油浸纸绝缘模型
图 7  油浸纸-油模型
图 8  稳态电压下双层介质中电荷和电场分布
图 9  极性反转下双层介质中电荷和电场分布
图 10  界面电荷密度及场强随时间变化曲线
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