详细分析LCD - 3a线路纵差保护误动的原因，提出解决的措施及理论依据。
Reasons of wrong actions of longitudinal differential protection of LCD-3A line are analyzed. Solutions and theoretic criteria are proposed.
第二，对二元概率假设检验理论进行研究，并通过其来完成作动器故障的残差判决。
Secondly, Binary probability hypothesis detection is studied and is utilized as actuators' FDI residual decision.
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