不同接线组别的配电变压器雷击建模及雷电防护性能分析  

Lightning Stroke Model and Protection Analysis of Distribution Transformer with Different Wiring Groups

作　　者：刁其先 孙蓬勃 李刚 咸日常[2] 王在明 DIAO Qixian;SUN Pengbo;LI Gang;XIAN Richang;WANG Zaiming(State Grid Shandong Electric Power Company Yantai Power Supply Company,Yantai 264000,China;School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China)

机构地区：[1]国网山东省电力公司烟台供电公司,山东烟台264000 [2]山东理工大学电气与电子工程学院,山东淄博255000

出　　处：《电工技术》2023年第13期196-200,共5页Electric Engineering

基　　金：国网山东省电力公司科技项目“配电变压器雷电防护关键技术研究与应用”(编号5206002000SB)。

摘　　要：由雷击引发的变压器事故严重威胁电网的安全可靠运行。为研究Dyn11型和Yyn0型配电变压器的防雷性能,考虑绕组接线方式对分布电容参数、零序磁通分布的影响,并根据Dyn11型和Yyn0型配电变压器防雷接地特性的不同,运用ATP-EMPT和ANSOFT Maxwell软件对两种类型的配电变压器进行雷击建模,对防雷性能开展了定量计算和对比分析。结果表明:三角形绕组冲击电流产生的总磁势和二次侧相反,由于雷电流在每个铁心柱上产生的总磁势都很小,因此逆变换过电压可看作为零,选用三相五柱式配电变压器对逆变换过电压的抑制作用明显。不同接线组别的配电变压器绕组分布参数不同,Dyn11型配电变压器具有较好的防雷性能,而且加装避雷器后,雷电过电压幅值大幅降低,防雷效果好。The accidents caused by lightning strikes seriously threaten the safe and reliable operation of power grid.To study the lightning protection performance of Dyn11 and Yyn0 distribution transformers,the influence of winding connection mode on distributed capacitance parameters and zero sequence magnetic flux distribution was considered.Based on the different lightning protection grounding characteristics of Dyn11 and Yyn0 distribution transformers,ATP-EMPT and ANSOFT Maxwell software were used to model lightning strikes of the two types of distribution transformers,and quantitative calculations and comparative analysis were conducted on lightning protection performance.The results show that the total magnetic potential generated by the triangular winding to the surge voltage is opposite to that of the secondary side.Since the total magnetic potential generated by the lightning current in each core column is very small,the inversion overvoltage can be regarded as zero,and the selection of three-phase five-column distribution transformers has a significant inhibiting effect on the inversion overvoltage.Due to the different distribution transformer winding distribution parameters of different wiring groups,Dyn11 type distribution transformers have better lightning protection performance.After the addition of lightning arrester,the lightning overvoltage amplitude is greatly reduced and with the use of lightning arrester,the lightning protection effect is better.

关 键 词：配电变压器 DYN11 雷电过电压 逆变换过电压 雷击 

分 类 号：TM421[电气工程—电器] TM86