基于补偿点阻抗的阻抗角特性的串补线路距离保护方法  

Distance Protection Principle for Series Compensated Lines Based on the Impedance Angle of the Compensated Point

作　　者：刘淑磊[1] 陈福锋[2] 何奔腾[1] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]国电南京自动化股份有限公司,江苏省南京市210003

出　　处：《电力系统自动化》2010年第21期70-74,共5页Automation of Electric Power Systems

摘　　要：将保护安装处到串补电容间线路阻抗与测量阻抗之差定义为补偿点阻抗,深入分析了串补电容前后金属性故障时补偿点阻抗的阻抗角特性。在电容前金属性故障时,补偿点阻抗的阻抗角介于70°～90°之间;在电容后金属性故障时,补偿点阻抗的阻抗角介于90°～270°之间。据此提出了串补线路故障点位置识别方法,结合传统距离保护形成了适用于串补线路的距离保护新方法。与传统的电平检测方案相比,该方法明显提高了串补线路距离保护的保护范围。EMTP仿真验证了该方法的正确性和有效性。Compensated point impedance is defined as the margin of the line impedance between the distance protection relay with the series capacitor and the measured impedance.The impedance angle of the compensated point impedance is between 70° and 90°with fault happened before the series capacitor and is between 90°and 270°with fault occurred after the series capacitor.Accordingly,a new method of fault point recognition is derived.It is integrated with the traditional distance protection to form a new series compensated line distance protection principle.Compared with the voltage-detected program, the new principle obviously increases the distance range of distance protection and effectively solves the steady state overreach problem.This method is verified by simulations using Elector-Magnetic Transient Program.

关 键 词：串补电容 距离保护 故障点位置识别 阻抗角 

分 类 号：TM773[电气工程—电力系统及自动化]