摘要
雷电过电压是威胁变电站安全运行的主要原因之一,目前主要通过合理配置避雷器的数量和布置安装位置进行保护,但安装避雷器数量较多会提高变电站造价,导致经济性下降。雷电过电压的频率范围一般为20 kHz至1 MHz,远远超过工频电压的50 Hz,根据这一特点提出在进线入口加装由电感线圈和耦合电容组成的高压L-C滤波器的替代措施。以某500 kV气体绝缘变电站(GIS)为研究对象,设计了电感值314μH、电容值12.1 nF、爬电距离23 816 mm、干弧距离6 m的高压L-C滤波器,通过EMTP-ATP仿真验证其良好的性能,且提出了敞开式绝缘(AIS)避雷器搭配高压L-C滤波器的防雷保护方案。通过仿真对比发现,采用AIS避雷器搭配高压L-C滤波器限制雷电过电压的效果更突出,且经济性更好。研究证明,高压L-C滤波器可替代GIS避雷器对GIS变电站进行更为有效的防雷保护。
Lightning overvoltage is one of the main reasons for threatening the safe operation of a transformer substation,and the main protection scheme is currently to reasonably configure the number of lightning arrester and the location of the arrangement.However,the installation of the number of lightning arrester will increase the cost of the substation.The frequency range of lightning over voltage is generally 20 kHz to 1 MHz,which is far more than the 50 Hz of the power frequency voltage.According to this characteristic,we proposed an alternative measure of the HV L-C filter which is composed of the inductance coil and the coupling capacitor.Taking a 500 kV gas insulated substation(GIS)as the research object,we designed an HV L-C filter of which the inductance value is 314μH,the capacitance value is 12.1 nF,the creepage distance is 23 816 mm,and the dry arc distance is 6 m,and verified the excellent overvoltage limiting performance based on EMTP-ATP simulation.Moreover,we put forward a lightning protection scheme of air insulated substation(AIS)surge arrester and high voltage L-C filter.The simulation and comparison results reveal that the AIS lightning arrester combined with a high voltage L-C filter is more effective and economical in limiting lightning overvoltage.It is proved that the HV L-C filter can replace GIS surge arrester to more effectively complete lightning protection for GIS substation.
作者
樊友平
陈艺
白津阳
吴蔚
宋佳翰
王彤
FAN Youping;CHEN Yi;BAI Jinyang;WU Wei;SONG Jiahan;WANG Tong(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2019年第4期1256-1265,共10页
High Voltage Engineering
基金
中国南方电网有限责任公司科技项目(K-GY2012-050)~~
