T型输电线路电弧故障测距时域方法研究

利用单端数据的输电线路故障测距算法 ,较难解决多端系统的故障定位问题 ,实际中一般采用多端数据进行测距。频域法故障测距精度易受时窗位置、直流衰减分量、过渡电阻非线性等因素影响 ,其频域算法的数据多取之于故障后第二周波。随着继电保护技术的发展 ,从故障发生到断路器动作的时间愈来愈短 ,故障后第二周波内断路器可能已动作 ,这将使频域算法失效。本文提出了T型输电线路故障测距时域新方法 ,该方法可采用故障后第二个半周波的数据 ,所有解算均在abc坐标中进行 ,测距无需判断故障类型 ,而且使用了最小二乘技术 ,从理论上保证了该测距算法具有较高的测距精度。

A New Time-Domain Method for Locating Faults on T-Connecion to Three Terminal Transmission Lines

Since fault location algorithm using one-terminal data is difficult to be directly applied to multi-terminal system,multi-terminal data are often used to locate fault in practice.The data that are used in frequency domain algorithms are often selected in the second cycle after the fault.With the development of protection technology,it takes less and less time for the circuit breaker to clear the faults.The frequency domain algorithm may be invalid because the breaker may have operated during the second cycle after the fault.Then,a new time-domain method for locating fault on T-connection power line is presented.This method uses the data in the second half cycle after the fault,needn't phase-modal transform and can locate all kind of faults.The solution is given using the method of least error squares,which ensures the method with high accuracy of locating fault theoretically.