海上升压站主变避雷器雷电过电压保护距离研究  

MOA's Lightning Overvoltage Protection Distance of Main Transformer in Offshore Substation

作　　者：徐旸[1] 朱晟[2] 蓝磊[1] 王羽[1] 文习山[1] 

机构地区：[1]武汉大学电气工程学院,武汉市430072 [2]云南电网公司昆明供电局,昆明市650000

出　　处：《电力建设》2016年第2期138-144,共7页Electric Power Construction

摘　　要：国内早期的海上升压站为主变室外布置,主变油枕易遭受雷击。通过分析避雷器保护距离产生的原因,借助ATP/EMTP电磁暂态仿真软件,建立了变压器雷击暂态模型,并结合工程实例分析了雷电流幅值及避雷器安装位置对站内设备过电压的影响。研究发现:雷击主变油枕,站内主要受影响的设备为主变压器,且避雷器的安装位置很大程度上影响着变压器上的雷电冲击过电压值。因此,文章对避雷器保护距离进行了进一步的研究分析,指出在进行海上升压站设计时,避雷器应尽量靠近主变压器安装。最后,通过参数拟合得出避雷器保护距离与雷电流幅值配合曲线及避雷器保护距离与平台接地电阻配合曲线,为海上升压站内避雷器的安装提供了参考依据。Domestic main transformer was exposed in early time and its conserver was likely to be stroke by lightning. Through the analysis on the causes of the protection distance of metal oxide arrester （ MOA）, this paper constructs the transient model of transformer during lightning stroke with using electromagnetic transient simulation software ATP/EMTP, and analyzes the influences of lightning current amplitude and MOA＇s position on the overvoltage of substation devices combined with engineering examples. The results show that, the main transformer is the mainly influenced device in the platform, and the MOA＇s position has a great effect on the lightning overvoltage of the transformer, during the lightning stroke on the conserve in main transform. Therefore, this paper further analyzes the protection distance of MOA, whose results show that MOA should be installed as close as possible to the main transformer during the design of offshore substation. At last, through the parameter fitting, we obtain the curves of MOA＇s protection distance with lightning current amplitude and that with earth resistance, which can a reference for the MOA＇s installment in offshore substation.

关 键 词：海上升压站 变压器 雷电过电压 避雷器(MOA) 保护距离 

分 类 号：TM862[电气工程—高电压与绝缘技术]