【摘要】 500 kV干式空心电抗器用来限制500 kV系统的短路电流。在制造电抗器前,需要对电抗器的过电压耐受进行评估,保证匝间电压小于绝缘值。笔者在已知电抗器分布参数的基础上,用链型回路等值电抗器,采用PSCAD/EMTDC程序求解在雷电和操作冲击下的匝间电压。计算表明,雷电时外圈首匝匝间过电压最大,可达19.8 kV,操作时首匝匝间过电压最大,可达10 kV,但都小于36 kV的耐受值。更多还原

【Abstract】 Air-cored current-limiting inductor(CLI) is used to limit the magnitude of fault current in 500 kV power systems.Before manufacturing the CLI,the over-voltage withstand ability of CLI should be evaluated to ensure the voltage between two coils less than the withstand value.Therefore,the distribution circuit of CLI is solved with PSCAD/EMTDC based on the known distribution parameter of CLI in this paper.The results show that the maximum voltage between the two first coils under lightning surge is 19.8 kV,and under switching is 10 kV,both of which are less than the withstand value 36 kV.更多还原