摘要
750kV线路进线保护段内单相导线遭受雷击时,导线上会出现强烈的电晕,使雷电波发生衰减和变形。基于线路的库-伏特性,并用简单的电路模型来模拟输电线路电晕特性,研究了进线开关在额定电压为600kV的MOA保护下触头间暂态过电压。结果表明,额定电压为600kV的MOA能有效保护进线开关,并且自身能正常工作;电晕使雷电波发生较大的衰减和变形,对开关触头间过电压幅值影响不大。
When the lightning strokes the feed-in section of 750 kV transmission line, there will be strong corona that contributes to the attenuation and distortion of lightning current. It is concerned what corona will do on the transient overvoltage between contacts of switch. On the basis of the Q-V characteristics of transmission lines, in this paper, a simple circuit model is set up and the transient overvoltage between contacts is studied when the switch is under the protection of MOA of 600 kV rated voltage. The result of computation indicates that the switch in 750 kV transmission line can work normally under the protection of the MOA and the corona causes the great attenuation and distortion of lightning current and does little effect on overvoltage between the contacts.
出处
《高压电器》
CAS
CSCD
北大核心
2004年第3期167-169,172,共4页
High Voltage Apparatus
关键词
暂态过电压
进线段
电晕
开关触头
衰减和变形
吸收能量
transient overvoltage
feed-in section
corona
switch contact
attenuation and distortion
energy absorbed
