摘要
建立了以气体绝缘输电线路(GIL)作为GIS出线的750kVGILGIS系统。用EMTP程序计算雷击塔顶和绕击输电线路两种雷击方式下GILGIS系统内隔离开关、接地开关、断路器、电流互感器以及变压器上的过电压。根据各设备上的过电压数值提出了相应的金属氧化物避雷器保护方案。比较GIL和架空输电线路(OHL)分别作为GIS出线的防雷效果,结果表明:OHL防绕击较优,GIL防直击雷较优。
On the basis of one 750 kV substation, the 750 kV GIL-GIS system that takes gas insulated line (GIL) as the ingoing line of GIS is established in this paper. Through two types of lightning stroke, lightning stroke on the top of a tower and shielding failure, considering the effects of ground angle and ground resistance, the lightning over-voltages on disconnecting switch (DS), circuit breaker (CB), current transformer (CT) and transformer are calculated by EMTP when lightning waves intrude into the 750kV GIL-GIS system. According to the over-voltage values on the above equipment, the protective scheme adopting mental oxide arrestor (MOA) are correspondingly presented. The effects of lightning protection are compared when the ingoing line of GIS is GIL and overhead line (OHL) respectively, and the results are analyzed also.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2005年第6期39-41,共3页
High Voltage Engineering
关键词
GIL
OHL
MOA
绕击
雷击塔顶
雷电防护
gas- insulated transmission lines
overhead lines
mental oxide arrestor
lightning shielding failure
lightning striking the tower top
protection of lightning intruding waves
