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分析了单端电压行波中各种可能存在的波头,得出了不考虑母线分布电容的方法不能完整地实现第2个反向行波识别的结论。推导了电压行波在分布电容处的传播特性,指出电压行波在分布电容处的初始反射系数恒为负。利用这个结论,提出了一种新型的第2个反向行波识别方法。理论分析和仿真结果表明,这种方法具有很高的可靠性,且不受线路两端母线类型的影响。
The possible wave front in single-ended voltage traveling wave is analyzed, and the conclusion that the method of disregarding the distributed capacitance of bus can not realize the second wave traveling wave identification completely is obtained. The propagation characteristics of the voltage traveling wave at distributed capacitance are deduced. It is pointed out that the initial reflection coefficient of the voltage traveling wave at the distributed capacitance is always negative. Using this conclusion, a new type of second-order back-traveling wave recognition method is proposed. Theoretical analysis and simulation results show that this method has high reliability and is not affected by the type of busbar at both ends of the line.