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中文摘要：
针对长输电线路补偿算法采用传统距离保护测距方程后耐过渡电阻能力不强,在保护范围末端发生高阻接地故障时保护容易超越的问题,提出了一种新的基于参数识别的时域长输电线路接地距离保护算法。故障发生后,采用引入插值法的Bergeron模型,利用保护安装处的电压电流来计算线路末端的电压电流,在线路末端应用所推导出的可用于长输电线路分布参数的具有3个系数的时域解微分方程算法来计算故障距离。当计算距离小于保护整定距离时,判为区内故障,保护动作跳闸;否则,保护不动作。理论分析和仿真实验证明,该算法不受长输电线路分布电容和故障暂态的影响,动作速度快,耐过渡电阻能力强,在300km长输电线路、300Ω过渡电阻条件下,保护可靠动作,不会发生超越。
英文摘要：
The long transmission line compensation algorithm using the traditional distance protection ranging equation will cause overreach when high resistance grounding faults happen in the end of protection domain. To solve this problem, we put forward a grounding distance protection algorithm for long transmission line based on parameter identification in time domain. When faults happen, the algorithm calculates the voltages and currents in the end of the line using the voltages and currents at the relay location, then calculates the fault distance in the end of the transmission line using a new differential equation, which is deduced with three unknown quantities and can be used in the long transmission line of distributing parameter characteristics. When the calculated fault distance is within the protection setting range, the fault happens inside the protection zone and the protection trips. Otherwise, no protection acts. Theoretical analysis and simulation results show that the proposed algorithm avoids the impacts from distribution capacitance current and fault transient signals, and has a high responding speed and high capacity of earth-fault resistance. This protection can trip reliably under 300 ~q earth-fault resistance in 300 km long transmission line without overreach.
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