干式空心并联电抗器绕组匝间绝缘故障特征分析  

Analysis of inerturn insulation fault characteristic fordry-type air-core shunt reactor winding

作　　者：李增悦 咸日常[1] 张海杰 咸峰 赵飞龙 李嘉洋 王玮[1] LI Zengyue;XIAN Richang;ZHANG Haijie;XIAN Feng;ZHAO Feilong;LI Jiayang;WANG Wei(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China;State Grid Shandong Electric Extrahigh Voltage Company,Jinan 250118,China;Shandong Qixing Electric Technology Development Co.,Ltd.,Zibo 255000,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255000 [2]国网山东省电力公司超高压公司,山东济南250118 [3]山东七星电气科技发展有限公司,山东淄博255000

出　　处：《绝缘材料》2024年第3期121-128,共8页Insulating Materials

基　　金：国家自然科学基金资助项目(52077221)。

摘　　要：本文通过有限元软件建立仿真分析模型,研究干式空心并联电抗器绕组匝间绝缘故障的物理特征,探寻便于故障监测的敏感状态量。首先在有限元仿真软件中建立基于实际电抗器的“场-路”耦合模型并验证正确性,之后在其绕组不同层、不同高度位置设置匝间绝缘故障,研究回路总电流、等效阻抗、有功功率损耗等电气特征量随故障位置的变化规律,并分析空间磁感应强度和绕组受力的变化情况。结果表明:所研究的电气特征量变化率随绕组单匝匝间短路位置的变化而变化,在径向上呈现从内层到外层增大的趋势,在最外层有所减小,在轴向上由绕组中部向端部逐渐减小。绕组单匝匝间短路状态下的空间磁感应强度和故障绕组受力明显增大,等效电阻、功率因数和有功功率损耗的变化率均在500%以上,变化显著且方便获取,可作为干式空心并联电抗器匝间绝缘故障的在线监测量。In this paper,a simulation and analysis model was established by finite element software to study the physical characteristics of interturn insulation faults in dry-type air-core shunt reactor windings,and explore the sensitive state variables for easy fault monitoring.Firstly,the"field-circuit"coupling model based on actual reactor was established in the finite element simulation software,and its correctness was verified.Then,interturn insulation faults were set at different layers and heights of its windings,and the variation laws of the total loop current,equivalent impedance,active power loss,and other electrical characteristic quantities with fault positions were studied,the changes of spatial magnetic induction intensity and winding force were analyzed.The results show that the change rate of the studied electrical characteristic quantity varies with the short circuit position between single turns of the winding,which increases from the inner layer to the outer layer in the radial direction,and decreases in the outermost layer,and gradually decreases from the middle to the end of the winding in the axial direction.The spatial magnetic induction intensity and the stress on the faulty winding under the condition of single interturn short circuit of the winding increase obviously,and the change rate of equivalent resistance,power factor,and active power loss are all above 500%,which change obviously and are convenient to obtain,they can be used as online monitoring quantities of interturn insulation fault in dry-type air-core shunt reactor.

关 键 词：干式空心并联电抗器 匝间绝缘故障 故障特征 在线监测 

分 类 号：TM472[电气工程—电器]