摘要
文中提出了一种判断串补线路单相接地故障时故障点相对于串联补偿电容位置的模型识别方法,该方法通过比较不同模型计算出线路电感值的离散度来识别故障位置。将该方法和传统的距离保护相配合,可以解决传统距离保护在串补线路中超越的问题,使得距离Ⅰ段可以按全线阻抗整定,而不必考虑电容的容抗,很大程度地提高了距离Ⅰ段的灵敏度。判别过程仅利用 MOV 导通前一段时间的暂态量数据,不受 MOV 非线性特性的影响,避开了 MOV 导通后串补电容上电压准确值难以获得的问题。该方法仅利用单端电气量,无需通讯通道;数字仿真结果表明:该方法具有很好的适应性,适合于各种电压等级、各种频率的系统,线路各处故障。
Based on comparing inductance value calculated with different models and same data, a new method for identifying the fault location relative to series capacitor on transmission lines with series compensated capacitor in the middle is proposed. Cooperated with the new method, traditional distance protection will avoid overreach for external faults on compensated lines, the sensitivity of Zone 1 will be greatly improved. Since only the data before MOV operation are used, MOV’s nonlinear characteristic needn’t to be considered in this method. Communication channels can be saved for only one end data is used in this method. From the digital simulation results, we can see this method can be used in all kinds of systems including different voltage and different frequency.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2005年第1期66-72,共7页
Proceedings of the CSEE
