三峡电站不完全裂相横差保护的灵敏度分析

Sensitivity Analysis of Incomplete Split-Phase Transverse Differential Protection for Three Gorge Power Station

采用“多回路分析法”对三峡电站 1号和 2号发电机所有可能发生的同槽和端部交叉故障进行了计算 ,在此基础上计算了上述每一种故障条件下传统裂相横差保护和不完全裂相横差保护的灵敏度 ,并对两种保护方案的灵敏动作数 ,可能动作数和不能动作数进行了统计 ,然后进一步分析了不能动作故障的性质。依据计算和统计结果 ,分析了两种保护方案对于不同结构发电机的灵敏度的差异。

For No.1 and No.2 generators of Three Gorge Power Station all possible slot and end faults are respectively calculated by multi loop method. Based on that, the sensitivities of traditional (complete )and incomplete split phase transverse differential protections are calculated for each fault condition. The possible operation times, sensitive operation times and non operation times are counted for these two protection schemes, and then the non operation faults are classified. With the calculation and statistic results, the sensitivity difference between the two protection schemes for generators with different structure are analyzed.