特高压换流变压器匝间短路故障建模与仿真  

Modeling and simulation of interturn short-circuit faults in ultra-high voltage converter transformers

作　　者：陈一悰 陈宗让 张芃 徐浩东 锁军 张钰声 朱述友 闫晨光[3] CHEN Yicong;CHEN Zongrang;ZHANG Peng;XU Haodong;SUO Jun;ZHANG Yusheng;ZHU Shuyou;YAN Chenguang(Electric Power Research Institute,State Grid Shaanxi Electric Power Co.,Ltd.,Xi’an 710100,China;Extra-High Voltage Company,State Grid Shaanxi Electric Power Co.,Ltd.,Xi’an 710075,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Beijing Zhongruihe Electrical Co.,Ltd.,Beijing 101300,China)

机构地区：[1]国网陕西省电力有限公司电力科学研究院,陕西西安710100 [2]国网陕西省电力有限公司超高压公司,陕西西安710075 [3]西安交通大学电气工程学院,陕西西安710049 [4]北京中瑞和电气有限公司,北京101300

出　　处：《电工电能新技术》2024年第10期43-51,共9页Advanced Technology of Electrical Engineering and Energy

基　　金：陕西省电力有限公司科技项目(5226KY23000F)。

摘　　要：近年来,特高压换流变压器内部短路故障导致的爆炸起火事故接连发生,严重威胁电力系统安全稳定运行。本文以±800 kV特高压换流站典型单相四柱式换流变压器为研究对象,基于ANSYS Maxwell和Simplorer平台开展绕组匝间短路故障建模仿真,研究不同故障条件下绕组漏磁、短路环流及电弧故障能量的变化规律。结果表明:伴随匝间短路发生,换流变压器内部大量横向漏磁破坏绕组正常纵向磁通分布,短路匝环中出现高幅值故障环流。1.98%匝间短路漏磁峰值达2.76 T,短路环流峰值达80.59 kA,四个周波内释放能量1.22 MJ。根据安匝平衡规律,短路匝数越多,环流幅值越小,而电弧电压随电弧长度单调增加,总体而言电弧能量与短路匝数呈正相关。此外,由于漏磁畸变引起的漏电感差异,靠近绕组中部的匝间短路故障更为严重。In recent years,internal short-circuit faults inside ultra-high voltage(UHV)converter transformers have led to a spate of explosive fires,posing a serious threat to the safe and reliable operation of power systems.In this paper,taking a typical single-phase four-limb converter transformer of±800 kV UHV converter station as a research case,modeling and simulation of winding interturn short-circuit fault are carried out on ANSYS Maxwell&Simplorer platform.The variation characteristics of radial leakage flux,the short-circuit current and the arcing fault energy under different fault scenarios are investigated.The results show that the normal axial flux distribution is disturbed by a large amount of radial leakage flux inside the converter transformer with the occurrence of interturn short-circuit fault,and high-amplitude fault circulating current emerges in the short-circuit loop.Under a 1.98%interturn short-circuit fault,the magnetic leakage flux density reaches 2.76 T at peak,the short-circuit circulating current reaches 80.59 kA at peak,and the fault energy released over four cycles reaches 1.22 MJ.According to the law of ampere-turn balance,the more the shorted turn number,the lower the circulating current amplitude.However,since the average arc voltage increases monotonically with the arc length,the overall arc energy is positively correlated with the number of shorted turns.In addition,interturn short-circuit faults closer to the middle part of the winding are more serious due to the difference in leakage inductance caused by the leakage distortion.

关 键 词：特高压换流变压器 匝间短路故障 油气电弧模型 建模仿真 

分 类 号：TM772[电气工程—电力系统及自动化]