安徽"十一五"电网的短路电流水平分析及限制措施研究

随着安徽电网规模的不断扩大,系统短路电流水平逐年增长,某些开关设备的遮断容量已接近或超过了额定值.对安徽"十一五"电网的短路电流水平进行了分析和计算,找出短路电流水平的薄弱环节,并分别通过采用分层分区、变压器中性点加装小电抗、加装故障限流器等措施对短路电流进行限制,以保证电网安全稳定运行.

Short-circuit current levels of Anhui Power Grid during "11th Five-year Plan" period and its limitation

With the extension of Anhui Power Grid,the short-circuit current level of the system keeps rising,and the breaking capacity of some circuit breakers is already close to or even has exceeded the rated value.The short-circuit current levels of Anhui Power Grid during "11th Five-year Plan" period are analyzed and computed,and the weaknesses are found out.Measures such as leveling and districting of the grid,adding small impedance at the transformer neutral-point,and installing current limiters are adopted to limit the short-circuit current to ensure the safe and stable operation of the Grid.