摘要
变电站的雷电侵入波过电压与线路绝缘子串的闪络情况密切相关,文中基于ATP-EMTP,建立了500 kV变电站和进线段的雷电计算模型,研究了绝缘子串闪络判据对变电站雷电侵入波过电压的影响,校验了采用更符合线路实际运行情况的先导闪络判据时变电站的绝缘配合情况。研究结果表明:绕击情况下,绝缘子串采用先导闪络判据时变电站设备上的雷电过电压增大。其中距变电站1.5 km内,可能会对变电站设备产生威胁;而距离变电站1.5 km后,由于雷电波在传播过程的衰减和畸变,侵入波对变电站设备不构成威胁。为保证变电站的安全运行,应提高变电站进线段的防绕击措施。
The lightning invaded overvohage in substation is closely related with the flashover situation of insulator string. Consequently based on ATP-EMTP, a lightning calculation model of 500kV substation with incoming lines was established, and the effect of insulator flashover criterion on lightning invaded overvoltage in substation was researched. Moreover, the insulation coordination of transformer substation when taking the lader flashover criteria consistented more with the actual operation of line was checked. The research results show that lightning overvoltage on substation equipment increased when leader flashover criterion is used for insulator string, under Lightning shielding failure. Within 1.Skin from the substation, substation equipments may be threatened; but with 1.Skm or more from the substation, by reason of attenuation and aberration of lightning wave in propagation, substation equipments arc not threatened by invading wave. In order to ensure the safe operation of substation, the lightning prevention measures should be improved.
出处
《电瓷避雷器》
CAS
北大核心
2013年第1期16-20,24,共6页
Insulators and Surge Arresters
关键词
雷电侵入波过电压
闪络判据
变电站
绝缘配合
lightning invaded overvoltage
flashover criterion
substation
insulation coordination
