不同接地方式下变压器35 kV绕组外部过电压特性分析及防治措施  

External Overvoltage Characteristics of 35 kV Winding of Transformer Under Different Grounding Modes and Prevention Measures

作　　者：胡晓宇 陈皓[1] 刘守豹 HU Xiaoyu;CHEN Hao;LIU Shoubao(College of Electrical Engineering Sichuan University,Chengdu 610065,China;Datang Hydropower Science&Technology Research Institute Co.,Ltd.,Nanning 530007,China)

机构地区：[1]四川大学电气工程学院,成都610065 [2]大唐水电科学技术研究院有限公司,南宁530007

出　　处：《电瓷避雷器》2023年第2期95-103,共9页Insulators and Surge Arresters

基　　金：中国大唐集团有限公司科技项目资助“基于尾端电流监测的避雷器状态评估及发电厂过电压智能识别系统研究”。

摘　　要：变压器35 kV绕组中性点接地方式较多,现有设计没有对不同接地方式下变压器的防雷措施进行专门考虑,导致变压器35 kV侧雷击事故频发。为了对不同接地方式下变压器35 kV绕组雷电侵入波特性及防治措施进行研究,采用电磁暂态分析软件ATP-EMTP建立仿真模型,对35 kV绕组星形接线的配网变压器和三角形接线的风电场升压变进行了雷电侵入波电磁暂态仿真,分析了导致35 kV绕组绝缘损坏的雷电侵入波特点,考察了不同安装方式下避雷器对雷电侵入波防治的有效性。研究表明不同接地方式下变压器35 kV绕组的雷电过电压特性不同,应根据不同接地方式采取针对性防雷措施。There are many neutral grounding modes in 35 kV winding of transformer,and the existing de-sign does not specially consider the lightning protection measures of transformer under different grounding modes,which leads to frequent lightning accidents on 35 kV side of transformer.In order to study the characteristics and prevention measures of lightning inrush wave in 35 kV winding of transformer under different grounding modes,the electromagnetic transient analysis software ATP-EMTP is used to estab-lish the simulation model,and the electromagnetic transient simulation of lightning inrush wave is carried out for the distribution network transformer with star connection and the step-up transformer of wind farm with triangle connection of 35 kV winding,and the characteristics of lightning inrush wave causing insula-tion damage of 35 kV winding are analyzed.The effectiveness of lightning arrester to prevent and control lightning inrush wave under different installation modes is investigated.The research shows that the light-ning over-voltage characteristics of 35 kV winding of transformer are dfferent under different grounding modes,and corresponding lightning protection measures should be taken according to different grounding modes.

关 键 词：接地方式 绕组 雷电侵入波 电磁暂态 避雷器 

分 类 号：TM40[电气工程—电器]